CN103007597B - Roller type filter press - Google Patents
Roller type filter press Download PDFInfo
- Publication number
- CN103007597B CN103007597B CN201310007238.2A CN201310007238A CN103007597B CN 103007597 B CN103007597 B CN 103007597B CN 201310007238 A CN201310007238 A CN 201310007238A CN 103007597 B CN103007597 B CN 103007597B
- Authority
- CN
- China
- Prior art keywords
- dehydration
- mud
- pressure mud
- roller
- running roller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000018044 dehydration Effects 0.000 claims abstract description 193
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 193
- 239000010802 sludge Substances 0.000 claims abstract description 148
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 100
- 238000007599 discharging Methods 0.000 claims abstract description 47
- 238000002156 mixing Methods 0.000 claims abstract description 38
- 238000012546 transfer Methods 0.000 claims abstract description 30
- 239000002689 soil Substances 0.000 claims description 36
- 239000007788 liquid Substances 0.000 claims description 27
- 241000521257 Hydrops Species 0.000 claims description 22
- 206010030113 Oedema Diseases 0.000 claims description 22
- 210000005056 cell body Anatomy 0.000 claims description 22
- 238000005096 rolling process Methods 0.000 claims description 19
- 238000001035 drying Methods 0.000 claims description 17
- 239000000523 sample Substances 0.000 claims description 16
- 238000001514 detection method Methods 0.000 claims description 13
- 238000003825 pressing Methods 0.000 claims description 7
- 230000001154 acute effect Effects 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 238000000605 extraction Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 244000144987 brood Species 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 description 7
- 230000001105 regulatory effect Effects 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 230000003750 conditioning effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000010862 gear shaping Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Landscapes
- Treatment Of Sludge (AREA)
- Filtration Of Liquid (AREA)
Abstract
Roller type filter press disclosed by the invention, comprise mud mixing arrangement and sludge dehydration device, its sludge dehydration device comprises a sludge dewatering mechanism, and this sludge dewatering mechanism comprises: a row to be engaged to dewatered sludge discharging opening direction successively by water-containing sludge charging aperture and the pressure mud roller set that forms of some pressure mud running rollers that position raises gradually; One arranges the dehydration roll wheels that some dehydration running rollers of being engaged successively to dewatered sludge discharging opening direction by water-containing sludge charging aperture form; Wherein form a mud transfer passage between dehydration roll wheels and pressure mud roller set, the arrival end of mud transfer passage is communicated with water-containing sludge charging aperture, the port of export is communicated with dewatered sludge discharging opening, and its mud transfer passage is contraction-like gradually to port of export direction by arrival end.The water-containing sludge brought by mud mixing arrangement by shrinking mud transfer passage gradually, and dewaters under pressure mud running roller with the extruding of dehydration running roller, and its dewatering efficiency is high, and water-containing sludge treating capacity is large.
Description
Technical field
The present invention relates to solid-liquid separating equipment, particularly a kind of roller type filter press.
Background technology
In environmental protection industry (epi), sewage disposal is an important part, and existing sewage processing filtering device has the filtration of centrifugal filtration, plate and frame, belt is filtered and spiral filtration.Wherein centrifugal filter rotating speed is high, and noise is large, and energy consumption is high, and plate and frame filtering machine structure is complicated, and take up an area large, filter cloth is easily broken, operates loaded down with trivial details.Belt filtering device takes up an area large, and consumed energy is large, fluctuation of service.Circulation lamination in spiral filter and axle easily wear and tear, and service life is shorter, and efficiency is low.Because these filters also exist problem, growing environmental protection cause requirement can not be adapted to.
Summary of the invention
Technical problem to be solved by this invention is the roller type filter press providing a kind for the treatment of effeciency high for the problem existing for existing all kinds of sewage processing filtering device.
Technical problem to be solved by this invention can be achieved through the following technical solutions:
Roller type filter press, comprising:
One mud mixing arrangement, this mud mixing arrangement has a water-containing sludge discharging opening;
One sludge dehydration device, this sludge dehydration device has a water-containing sludge charging aperture and dewatered sludge discharging opening, and described water-containing sludge charging aperture is communicated with the water-containing sludge discharging opening of described mud mixing arrangement; It is characterized in that, described sludge dehydration device also comprises:
One sludge dewatering mechanism, described sludge dewatering mechanism comprises:
One row to be engaged to dewatered sludge discharging opening direction successively by described water-containing sludge charging aperture and the pressure mud roller set that forms of some pressure mud running rollers that position raises gradually;
One arranges the dehydration roll wheels that some dehydration running rollers of being engaged successively to dewatered sludge discharging opening direction by described water-containing sludge charging aperture form; Wherein said dehydration roll wheels are positioned at the below of described pressure mud roller set, a mud transfer passage is formed between dehydration roll wheels and pressure mud roller set, the arrival end of described mud transfer passage is communicated with described water-containing sludge charging aperture, the port of export is communicated with described dewatered sludge discharging opening, and its mud transfer passage is contraction-like gradually to port of export direction by arrival end.
In a preferred embodiment of the invention, described sludge dewatering mechanism also comprises a pair running roller gripper shoe, and the two ends of some pressure mud running rollers and the two end axles of some dehydration running rollers are located in a pair running roller gripper shoe.
In a preferred embodiment of the invention, the some pressure mud running rollers in described pressure mud roller set and the some dehydration running rollers in dehydration roll wheels rely on a chain type transmission mechanism synchronously drive and turn round.
In a preferred embodiment of the invention, in described pressure mud roller set, the central point line of each pressure mud running roller is a skew lines; Some dehydration running rollers in described dehydration roll wheels become spoon shaped formation, the central point line being arranged in each dehydration running roller on spoon shape shank is also a skew lines, the central point line being arranged in each dehydration running roller in spoon shape flat bottoms is a horizontal line, the central point line being arranged in each dehydration running roller on spoon shape lip is a skew lines, and in wherein said pressure mud roller set, the central point line of each pressure mud running roller is not parallel with the central point line being arranged in each dehydration running roller on spoon shape shank.
In a preferred embodiment of the invention, the central point line of the pressure mud running roller being in extreme higher position in described pressure mud roller set and the dehydration running roller being arranged in extreme higher position on spoon shape shank is a plumb line, be arranged in the central point line of each dehydration running roller on spoon shape shank and press angle in first between the pressure mud running roller being in extreme higher position in mud roller set and the central point line of the dehydration running roller being arranged in extreme higher position on spoon shape shank to be obtuse angle, and in described pressure mud roller set, respectively press angle in second between the pressure mud running roller being in extreme higher position in the central point line of mud running roller and pressure mud roller set and the central point line of the dehydration running roller being arranged in extreme higher position on spoon shape shank to be an acute angle, being arranged in angle in the 3rd between the central point line of each dehydration running roller on spoon shape shank and the central point line being arranged in each dehydration running roller in spoon shape flat bottoms is obtuse angle, and being arranged in angle in the 4th between the central point line of each dehydration running roller on spoon shape lip and the central point line being arranged in each dehydration running roller in spoon shape flat bottoms is obtuse angle.
In a preferred embodiment of the invention, angle is equal with angle in the 4th in the 3rd.
In a preferred embodiment of the invention, in second, angle is 120 °, and in the 3rd, in angle and the 4th, angle is 150 °.
In a preferred embodiment of the invention, be arranged in each dehydration running roller in spoon shape flat bottoms and be arranged in the water-containing sludge accepting area forming a brood of shape above each dehydration running roller on spoon shape lip, described water-containing sludge accepting area is communicated with the arrival end of mud transfer passage.
In a preferred embodiment of the invention, described sludge dehydration device also comprises a water-containing sludge and enters mud pipe, the arrival end that described water-containing sludge enters mud pipe is communicated with described water-containing sludge charging aperture, and the port of export that this water-containing sludge enters mud pipe is inserted in described water-containing sludge accepting area.
In a preferred embodiment of the invention, the port of export of described mud transfer passage is provided with an adjustable mud-pressing mechanism.
In a preferred embodiment of the invention, the spring pressurization mechanism that described adjustable mud-pressing mechanism comprises an adjustable soil compressing plate and pressurizes to described adjustable soil compressing plate, the upper end of described adjustable soil compressing plate is fixed on a soil compressing plate swinging axle, the two end axles of described soil compressing plate swinging axle is located in a pair running roller gripper shoe, described adjustable soil compressing plate is fixed with an adjusting screw(rod), described adjusting screw(rod) passes an adjusting screw(rod) gripper shoe and is rotary with an adjusting nut, one end of described spring pressurization mechanism is arranged in described adjusting screw(rod) gripper shoe, the other end is connected to the bottom of adjustable soil compressing plate, the two ends of described adjusting screw(rod) gripper shoe are fixed in a pair running roller gripper shoe.
In a preferred embodiment of the invention, be in described adjustable soil compressing plate and described pressure mud roller set the pressure mud running roller of extreme higher position tangent time, leave a mud extraction gap between this adjustable soil compressing plate and the dehydration roll wheel surface being arranged in extreme higher position on spoon shape shank.
In a preferred embodiment of the invention, be in described adjustable soil compressing plate and described pressure mud roller set the pressure mud running roller of extreme higher position tangent time, in the between the pressure mud running roller being in extreme higher position in adjustable soil compressing plate and pressure mud roller set and the central point line of the dehydration running roller being arranged in extreme higher position on spoon shape shank the 5th, angle is acute angle.
In described 5th, angle is 70 °.
In a preferred embodiment of the invention, be provided with a dump plate in the dewatered sludge discharging opening of described sludge dehydration device, the inner of described oblique mud plate contacts with the dehydration roll wheel surface being arranged in extreme higher position on spoon shape shank.
In a preferred embodiment of the invention, described sludge dehydration device also comprises enrichment region hydrops groove and drying zone hydrops groove, wherein said enrichment region hydrops slot is in being arranged in each dehydration running roller in spoon shape flat bottoms and being arranged in each dehydration running roller on spoon shape lip and being arranged in below one of extreme lower position on spoon shape shank dehydration running roller, and described drying zone hydrops slot is in being arranged on spoon shape shank except below all the other dehydration running rollers of a dehydration running roller of extreme lower position; The equal opening of enrichment region hydrops groove and drying zone hydrops groove top, and be provided with drainpipe in both bottoms.
In a preferred embodiment of the invention, in described drying zone hydrops groove, drying zone is installed and amasss liquid level of liquid tank meter.
In a preferred embodiment of the invention, described pressure mud running roller comprises a pressure mud rolling axle and some minor diameters pressure mud plectane and some major diameters and presses mud plectane, the two ends of wherein said pressure mud rolling axle have outward extending in order to bearings mounted collar end, and the two ends of this pressure mud rolling axle are provided with external thread part, some minor diameter pressure mud plectanes and some major diameters pressure mud plectane are enclosed within described pressure mud rolling axle, the external thread part at described pressure mud rolling axle two ends is respectively rotary with two block pressur plates, four block pressur plates are jointly by some minor diameter pressure mud plectanes and the clamping of some major diameters pressure mud plectane, wherein each block minor diameter pressure mud plectane is clipped between two blocks of major diameter pressure mud plectanes, the external diameter of minor diameter pressure mud plectane is less than the external diameter of major diameter pressure mud plectane, thus make between two blocks of major diameter pressure mud plectanes, to form a pressure mud groove of nipping for the major diameter pressure mud plectane on another pressure mud running roller.
In a preferred embodiment of the invention, the thickness of described minor diameter pressure mud plectane is greater than the thickness of major diameter pressure mud plectane.
In a preferred embodiment of the invention, described dehydration running roller comprise a dehydration roll wheel shaft and some minor diameters dehydration plectane and some major diameters dehydration plectane, the two ends of wherein said pressure mud rolling axle have outward extending in order to bearings mounted collar end, and the two ends of this pressure mud rolling axle are provided with external thread part, some minor diameter dehydration plectanes and some major diameters dehydration plectane are enclosed within described dehydration roll wheel shaft, the external thread part at described dehydration roll wheel shaft two ends is respectively rotary with two block pressur plates, four block pressur plates are jointly by some minor diameter dehydration plectanes and the clamping of some major diameters dehydration plectane, wherein each block minor diameter dehydration plectane is clipped between two blocks of major diameter dehydration plectanes, the external diameter of minor diameter dehydration plectane is less than the external diameter of major diameter dehydration plectane, thus make between two blocks of major diameter dehydration plectanes, to form a drench pit of nipping for the major diameter dehydration plectane on another pressure mud running roller.
In a preferred embodiment of the invention, the thickness of described minor diameter dehydration plectane is greater than the thickness of major diameter dehydration plectane.
In a preferred embodiment of the invention, described mud mixing arrangement comprises a mud mixing cell body and is arranged on the rabbling mechanism in described mud mixing cell body, the top of described mud mixing cell body is opened wide, and offers described water-containing sludge discharging opening on the frid top of this mud mixing cell body side; Described mud mixing cell body is also provided with liquid level gauge, described liquid level gauge has a high water level monitoring probe and a low water level detection probe, wherein, the liquid level that described high water level detection probe detects is concordant with the extreme higher position of described water-containing sludge discharging opening, and the liquid level that described low water level detection probe detects is concordant with the extreme lower position of described water-containing sludge discharging opening.
In a preferred embodiment of the present invention, described mud mixing arrangement also comprises a flow control board, and described flow control board slides and is inserted on described water-containing sludge discharging opening, in order to regulate the flow of water-containing sludge discharging opening.
Owing to have employed technical scheme as above, the water-containing sludge brought by mud mixing arrangement by shrinking mud transfer passage gradually, and dewaters under pressure mud running roller with the extruding of dehydration running roller, and its dewatering efficiency is high, and water-containing sludge treating capacity is large.In addition one adjustable mud-pressing mechanism is set at the port of export of mud transfer passage, the mud volume of dewatered sludge can be controlled and dewater further, final sludge moisture content is reduced greatly.Moreover, install a flow control board additional at the water-containing sludge discharging opening of mud mixing arrangement, the flow in water-containing sludge inflow sludge dehydration device can be regulated according to the water content of dewatered sludge.Structure of the present invention is simple, and cost is low, and mud handling capacity is large, easy to maintenance and efficiency is high.
Accompanying drawing explanation
Fig. 1 is the structure principle chart of roller type filter press of the present invention.
Fig. 2 is the structural representation that the present invention presses mud running roller.
Fig. 3 is that the present invention dewaters the structural representation of running roller.
Detailed description of the invention
The present invention is further described below in conjunction with the drawings and specific embodiments.
See the roller type filter press provided in Fig. 1, figure, the mud mixing arrangement 200, the sludge dehydration device 300 that comprise frame 100 and be arranged in frame 100.
The rabbling mechanism 220 that mud mixing arrangement 200 comprises a mud mixing cell body 210 and is arranged in mud mixing cell body 210, mud mixing cell body 210 is arranged in frame 100, and the top of mud mixing cell body 210 is opened wide, and pours water-containing sludge into facilitate.After water-containing sludge in mud mixing cell body 210 adds medicament, after rabbling mechanism 220 stirs, entered in sludge dehydration device 300 by the water-containing sludge discharging opening 211a on frid 211 top being opened in this mud mixing cell body 210 side.In order to control the flow of the water-containing sludge that water-containing sludge discharging opening 211a discharges, water-containing sludge discharging opening 211a is inserted with a flow control board 230, by regulating the high and low position of this flow control board 230, the i.e. size of adjustable water-containing sludge discharging opening 211a, and then the flow of the water-containing sludge regulating water-containing sludge discharging opening 211a to discharge.
In addition in order to control the liquid level of the water-containing sludge in mud mixing cell body 210, at mud mixing cell body 210, a liquid level gauge 240 is also installed, this liquid level gauge 240 has high water level monitoring probe 241 and a low water level detection probe 242, wherein, the liquid level that high water level detection probe 241 detects is concordant with the extreme higher position of water-containing sludge discharging opening 211a, and the liquid level that low water level detection probe 242 detects is concordant with the extreme lower position of water-containing sludge discharging opening 211a.When the liquid level of water-containing sludge in mud mixing cell body 210 rise to detect by high water level detection probe 241 liquid level time, when being namely about to the extreme higher position not having water-containing sludge discharging opening 211a, high water level detection probe 241 sends a control signal, controls sludge pump and stops carrying water-containing sludge in mud mixing cell body 210; And when the liquid level of water-containing sludge in mud mixing cell body 210 drop to detect by low water level detection probe 242 liquid level time, when being namely about to the extreme lower position not exposing water-containing sludge discharging opening 211a, low water level detection probe 242 sends a control signal, start sludge pump work, in mud mixing cell body 210, carry water-containing sludge.
Sludge dehydration device 300 can comprise a casing 310, can not certainly comprise casing, and the sludge dehydration device 300 of the present embodiment comprises a casing 310, and casing 310 is arranged in frame 100.This casing 310 is surrounded by plate 315 after top board 311, two blocks of side plates 312,313, one piece of header board 314 and a piece, header board 314 and frid 211 link together, a water-containing sludge charging aperture 314a corresponding with water-containing sludge discharging opening 211a position and shape is offered on the top of header board 314, water-containing sludge charging aperture 314a is communicated with water-containing sludge discharging opening 211a, water-containing sludge charging aperture 314a is connected with a water-containing sludge and enters mud pipe 320.
Offer a dewatered sludge discharging opening 315a in the position, middle and upper part of rear plate 315, discharge for dewatered sludge.
This sludge dehydration device also comprises and is positioned at casing 310 for a pair and is fixed on running roller fixed head in frame 100 330 and pressure mud roller set 340, dehydration roll wheels 350.
Pressure mud roller set 340 is made up of six pressure mud running rollers 341,342,343,344,345,346, and pressure mud running roller is also not limited to six certainly, can be more.Six pressure mud running rollers 341, 342, 343, 344, 345, 346 two ends are located on a pair running roller fixed head 330 by bearing shaft, six pressure mud running rollers 341, 342, 343, 344, 345, 346 are engaged position by water-containing sludge charging aperture 314a between a pair running roller fixed head 330 successively to dewatered sludge discharging opening 315a direction, mud running roller 341 is wherein pressed to be engaged with pressure mud running roller 342, pressure mud running roller 342 is engaged with pressure mud running roller 343, pressure mud running roller 343 is engaged with pressure mud running roller 344, pressure mud running roller 344 is engaged with pressure mud running roller 345, pressure mud running roller 345 is engaged with pressure mud running roller 346.
In pressure mud roller set 340, the central point line 347 of six pressure mud running rollers 341,342,343,344,345,346 is a skew lines, wherein press mud running roller 341 position minimum and be positioned near water-containing sludge charging aperture 314a side, press mud running roller 346 position the highest and be positioned near dewatered sludge discharging opening 315a side.
Dehydration roll wheels 350 are made up of eight dehydration running rollers 351,352,353,354,355,356,357,358, and dehydration running roller is also not limited to eight certainly, can be more.Eight dehydration running rollers 351, 352, 353, 354, 355, 356, 357, 358 two ends are located on a pair running roller fixed head 330 by bearing shaft, eight dehydration running rollers 351, 352, 353, 354, 355, 356, 357, 358 are engaged position by water-containing sludge charging aperture 314a between a pair running roller fixed head 330 successively to dewatered sludge discharging opening 315a direction, the running roller 351 that wherein dewaters is engaged with dehydration running roller 352, dehydration running roller 352 is engaged with dehydration running roller 353, dehydration running roller 353 is engaged with dehydration running roller 354, dehydration running roller 354 is engaged with dehydration running roller 355, dehydration running roller 355 is engaged with dehydration running roller 356, dehydration running roller 356 is engaged with dehydration running roller 357, dehydration running roller 357 is engaged with dehydration running roller 358.
Eight dehydration running rollers 351 in dehydration roll wheels 350, 352, 353, 354, 355, 356, 357, 358 one-tenth spoon shaped formation, be arranged in each dehydration running roller 354 on spoon shape shank, 355, 356, 357, the central point line 359 of 358 is also a skew lines, be arranged in the dehydration running roller 352 in spoon shape flat bottoms, the central point line 359a of 353 is a horizontal line, the line 359b be arranged between the central point of the dehydration running roller 351 on spoon shape lip and the central point being arranged in the dehydration running roller 352 in spoon shape flat bottoms is a skew lines, wherein press each pressure mud running roller 341 in mud roller set 340, 342, 343, 344, 345, the central point line 345 of 346 and each dehydration running roller 354 be arranged on spoon shape shank, 355, 356, 357, the central point line 359 of 358 is not parallel.Wherein
The pressure mud running roller 346 being in extreme higher position in pressure mud roller set 340 is a plumb line with the central point line 360 of both the dehydration running rollers 358 being arranged in extreme higher position on spoon shape shank, interior angle α between central point line 360 and central point line 359 is obtuse angle, be preferably 120 °, the interior angle β that central point connects between 347 and central point line 360 is an acute angle, and interior angle α and interior angle β sum are not equal to 180 °.Interior angle γ between central point line 359 with central point line 359a and the interior angle theta between central point line 359b with central point line 359a are obtuse angle and equal, and preferred version is the angle of interior angle γ and interior angle theta is 150 °.
Pressure mud running roller 341,342,343,344,345,346 in pressure mud roller set 340 and the dehydration running roller 351,352,353,354,355,356,357,358 in dehydration roll wheels 350 rely on a chain type transmission mechanism (not shown) synchronously drive and turn round.
Each pressure mud running roller 341 in pressure mud roller set 340, 342, 343, 344, 345, 346 and dehydration roll wheels 350 in each dehydration running roller 351, 352, 353, 354, 355, 356, 357, after 358 employing aforesaid way arrangements, make each pressure mud running roller 341 in pressure mud roller set 340, 342, 343, 344, 345, the 346 each dehydration running rollers 351 being arranged in dehydration roll wheels 350, 352, 353, 354, 355, 356, 357, the top position of 358, and make each pressure mud running roller 341 in pressure mud roller set 340, 342, 343, 344, 345, 346 with dehydration roll wheels 350 in each dehydration running roller 354, 355, 356, 357, a mud transfer passage 370 shunk gradually to dewatered sludge discharging opening 315a direction by water-containing sludge charging aperture 314a is formed between 358, namely mud transfer passage 370 is shunk to the port of export 373 direction gradually by arrival end 372.
Form the water-containing sludge accepting area 371 of a brood of shape above dehydration running roller 352,353 in dehydration roll wheels 350 and dehydration running roller 351, water-containing sludge accepting area 371 is communicated with the arrival end 372 of mud transfer passage 370.The port of export that water-containing sludge enters mud pipe 320 is inserted in water-containing sludge accepting area 371.First enter by water-containing sludge the water-containing sludge that mud pipe 320 brings like this drops in water-containing sludge accepting area 371, each pressure mud running roller 341 in pressure mud roller set 340, 342, 343, 344, 345, 346 and dehydration roll wheels 350 in each dehydration running roller 351, 352, 353, 354, 355, 356, 357, under 358 rotating drive, entered in mud transfer passage 370 by the arrival end 372 of mud transfer passage 370 and also move to the port of export 373 direction of mud transfer passage 370 gradually, in moving process, by each pressure mud running roller 341 in pressure mud roller set 340, 342, 343, 344, 345, 346 and dehydration roll wheels 350 in each dehydration running roller 351, 352, 353, 354, 355, 356, 357, the extruding of 358, moisture content in water-containing sludge is extruded out gradually, final formation dewatered sludge is sent by the port of export 373 of mud transfer passage 370.
In order to dewatered sludge is successfully sent by dewatered sludge discharging opening 315a, one dump plate 380 is installed in dewatered sludge discharging opening 315a, have multiple gear shaping (not shown) below the port of export 373 that the inner of dump plate 380 is positioned at mud transfer passage 370, the multiple gear shapings on dump plate 380 the inner are inserted in the multiple drench pits on dehydration running roller 358 respectively.The dewatered sludge sent by the port of export 373 of mud transfer passage 370 like this can drop on dump plate 380, and because dump plate 380 is in downward-sloping shape, the dewatered sludge dropped on like this on dump plate 380 skids off dewatered sludge discharging opening 315a by relying on the gravity of self.
In order to control the discharge rate of dewatered sludge, the port of export 373 of mud transfer passage 370 is provided with an adjustable mud-pressing mechanism 390.
The spring pressurization mechanism 392 that this adjustable mud-pressing mechanism 390 comprises an adjustable soil compressing plate 391 and pressurizes to adjustable soil compressing plate 391, the upper end of adjustable soil compressing plate 391 is fixed on a soil compressing plate swinging axle 393, and the two end axles of soil compressing plate swinging axle 393 is located in a pair running roller gripper shoe 330.
Adjustable soil compressing plate 391 is fixed with an adjusting screw(rod) 394, and adjusting screw(rod) 394 is through an adjusting screw(rod) gripper shoe 395 and header board 314 and be rotary with an adjusting nut 396.Adjusting screw(rod) 394 can be driven to move by adjusting nut 396, and then drive adjustable soil compressing plate 391 around soil compressing plate swinging axle 393 pivot, carry out the port of export 373 opening amount of conditioning of mud transfer passage 370, and then the discharge rate of the port of export 373 dewatered sludge out of conditioning of mud transfer passage 370.One end of spring pressurization mechanism 392 is arranged in adjusting screw(rod) gripper shoe 396, the other end is connected on the bottom of adjustable soil compressing plate 391, spring pressurization mechanism 392 applies certain pressure can to adjustable soil compressing plate 391, further dewaters to the port of export 373 dewatered sludge out of mud transfer passage 370.The two ends of adjusting screw(rod) gripper shoe 396 are fixed in a pair running roller gripper shoe 330.
When adjustable soil compressing plate 391 is tangent with pressure mud running roller 346, the port of export 373 dewatered sludge amount out of mud transfer passage 370 is minimum, leaves a mud extraction gap 397 between this adjustable soil compressing plate 391 and dehydration running roller 358 surface.This mud extraction gap 397 is minimum and be positioned at the top of dump plate 380.
When adjustable soil compressing plate 391 and pressure mud running roller 346 are tangent, the interior angle ε between adjustable soil compressing plate 391 and line 360 is acute angle, is preferably 70 °.
In order to accept the moisture content after sludge dewatering, this sludge dehydration device 300 also comprises enrichment region hydrops groove 301 and drying zone hydrops groove 302, enrichment region hydrops groove 301 is arranged in below the dehydration running roller 351,352,353,354 of dehydration roll wheels 350, and drying zone hydrops groove 302 is arranged in below the dehydration running roller 355,356,357,358 of dehydration roll wheels 350; The equal opening of enrichment region hydrops groove 301 and drying zone hydrops groove 302 top, and be provided with drainpipe in both bottoms.Another in drying zone hydrops groove 302, drying zone be installed and amass liquid level of liquid tank meter 303, amass by this drying zone the liquid level that liquid level of liquid tank meter 303 controls in drying zone hydrops groove 302.
See Fig. 2, the pressure mud running roller 340 provided in figure comprises a pressure mud rolling axle 340a and some minor diameters pressure mud plectane 340b and some major diameters pressure mud plectane 340c, the two ends of mud rolling axle 340a are wherein pressed to have the outward extending collar end 340d in order to install bearing 410, 340e, and the two ends of this pressure mud rolling axle 340a are provided with external thread part 340f, 340g, some minor diameter pressure mud plectane 340b and some major diameters pressure mud plectane 340c are enclosed within pressure mud rolling axle 340a, at the external thread part 340f at pressure mud rolling axle 340a two ends, 340g is respectively rotary with two block pressur plate 340h, 340i, four block pressur plate 340h, 340i is jointly by some minor diameter pressure mud plectane 340b and some major diameters pressure mud plectane 340c clamping, wherein each block minor diameter pressure mud plectane folder 340b is between two pieces of major diameter pressure mud plectane 340c, the external diameter of minor diameter pressure mud plectane 340b is less than the external diameter of diameter pressure mud plectane 340c, thus make to form a pressure mud groove 340n nipped for the major diameter pressure mud plectane on another pressure mud running roller between two pieces of major diameter pressure mud plectane 340c.The thickness of minor diameter pressure mud plectane 340b is greater than the thickness of major diameter pressure mud plectane 340c.
See Fig. 3, the dehydration running roller 350 provided in figure comprises a dehydration roll wheel shaft 340a and some minor diameters dehydration plectane 350b and some major diameters dehydration plectane 350c, wherein the two ends of dehydration roll wheel shaft 350a have the outward extending collar end 350d in order to install bearing 420, 350e, and the two ends of this dehydration roll wheel shaft 350a are provided with external thread part 350f, 350g, some minor diameter dehydration plectane 350b and some major diameters dehydration plectane 350c are enclosed within dehydration roll wheel shaft 350a, at the external thread part 350f at dehydration roll wheel shaft 350a two ends, 350g is respectively rotary with two block pressur plate 350h, 350i, four block pressur plate 350h, 350i is jointly by some minor diameter dehydration plectane 350b and some major diameters dehydration plectane 350c clamping, wherein each block minor diameter dehydration plectane folder 350b is between two pieces of major diameter dehydration plectane 350c, the external diameter of minor diameter dehydration plectane 350b is less than the external diameter of major diameter dehydration plectane 350c, thus make to form a drench pit 350n nipped for the major diameter dehydration plectane on another dehydration running roller between two pieces of major diameter dehydration plectane 350c.The thickness of minor diameter dehydration plectane 350b is greater than the thickness of major diameter dehydration plectane 350c.
Claims (21)
1. roller type filter press, comprising:
One mud mixing arrangement, this mud mixing arrangement has a water-containing sludge discharging opening;
One sludge dehydration device, this sludge dehydration device has a water-containing sludge charging aperture and dewatered sludge discharging opening, and described water-containing sludge charging aperture is communicated with the water-containing sludge discharging opening of described mud mixing arrangement; It is characterized in that, described sludge dehydration device also comprises:
One sludge dewatering mechanism, described sludge dewatering mechanism comprises:
One row to be engaged to dewatered sludge discharging opening direction successively by described water-containing sludge charging aperture and the pressure mud roller set that forms of some pressure mud running rollers that position raises gradually;
One arranges the dehydration roll wheels that some dehydration running rollers of being engaged successively to dewatered sludge discharging opening direction by described water-containing sludge charging aperture form; Wherein said dehydration roll wheels are positioned at the below of described pressure mud roller set, a mud transfer passage is formed between dehydration roll wheels and pressure mud roller set, the arrival end of described mud transfer passage is communicated with described water-containing sludge charging aperture, the port of export is communicated with described dewatered sludge discharging opening, and its mud transfer passage is contraction-like gradually to port of export direction by arrival end;
Some pressure mud running rollers in described pressure mud roller set and the some dehydration running rollers in dehydration roll wheels rely on a chain type transmission mechanism synchronously drive and turn round;
Described sludge dewatering mechanism also comprises a pair running roller gripper shoe, and the two ends of some pressure mud running rollers and the two end axles of some dehydration running rollers are located in a pair running roller gripper shoe.
2. the roller type filter press as described in any one of claim 1 claim, is characterized in that, in described pressure mud roller set, the central point line of each pressure mud running roller is a skew lines; Some dehydration running rollers in described dehydration roll wheels become spoon shaped formation, the central point line being arranged in each dehydration running roller on spoon shape shank is also a skew lines, the central point line being arranged in each dehydration running roller in spoon shape flat bottoms is a horizontal line, the central point line being arranged in each dehydration running roller on spoon shape lip is a skew lines, and in wherein said pressure mud roller set, the central point line of each pressure mud running roller is not parallel with the central point line being arranged in each dehydration running roller on spoon shape shank.
3. roller type filter press as claimed in claim 2, it is characterized in that, the central point line of the pressure mud running roller being in extreme higher position in described pressure mud roller set and the dehydration running roller being arranged in extreme higher position on spoon shape shank is a plumb line, be arranged in the central point line of each dehydration running roller on spoon shape shank and press angle in first between the pressure mud running roller being in extreme higher position in mud roller set and the central point line of the dehydration running roller being arranged in extreme higher position on spoon shape shank to be obtuse angle, and in described pressure mud roller set, respectively press angle in second between the pressure mud running roller being in extreme higher position in the central point line of mud running roller and pressure mud roller set and the central point line of the dehydration running roller being arranged in extreme higher position on spoon shape shank to be an acute angle, being arranged in angle in the 3rd between the central point line of each dehydration running roller on spoon shape shank and the central point line being arranged in each dehydration running roller in spoon shape flat bottoms is obtuse angle, and being arranged in angle in the 4th between the central point line of each dehydration running roller on spoon shape lip and the central point line being arranged in each dehydration running roller in spoon shape flat bottoms is obtuse angle.
4. roller type filter press as claimed in claim 3, it is characterized in that, in the 3rd, angle is equal with angle in the 4th.
5. roller type filter press as claimed in claim 3, it is characterized in that, in second, angle is 120 °, and in the 3rd, in angle and the 4th, angle is 150 °.
6. roller type filter press as claimed in claim 3, it is characterized in that, be arranged in each dehydration running roller in spoon shape flat bottoms and be arranged in the water-containing sludge accepting area forming a brood of shape above each dehydration running roller on spoon shape lip, described water-containing sludge accepting area is communicated with the arrival end of mud transfer passage.
7. roller type filter press as claimed in claim 6, it is characterized in that, described sludge dehydration device also comprises a water-containing sludge and enters mud pipe, the arrival end that described water-containing sludge enters mud pipe is communicated with described water-containing sludge charging aperture, and the port of export that this water-containing sludge enters mud pipe is inserted in described water-containing sludge accepting area.
8. roller type filter press as claimed in claim 3, is characterized in that, the port of export of described mud transfer passage is provided with an adjustable mud-pressing mechanism.
9. roller type filter press as claimed in claim 8, it is characterized in that, the spring pressurization mechanism that described adjustable mud-pressing mechanism comprises an adjustable soil compressing plate and pressurizes to described adjustable soil compressing plate, the upper end of described adjustable soil compressing plate is fixed on a soil compressing plate swinging axle, the two end axles of described soil compressing plate swinging axle is located in a pair running roller gripper shoe, described adjustable soil compressing plate is fixed with an adjusting screw(rod), described adjusting screw(rod) passes an adjusting screw(rod) gripper shoe and is rotary with an adjusting nut, one end of described spring pressurization mechanism is arranged in described adjusting screw(rod) gripper shoe, the other end is connected to the bottom of adjustable soil compressing plate, the two ends of described adjusting screw(rod) gripper shoe are fixed in a pair running roller gripper shoe.
10. roller type filter press as claimed in claim 9, it is characterized in that, be in described adjustable soil compressing plate and described pressure mud roller set the pressure mud running roller of extreme higher position tangent time, leave a mud extraction gap between this adjustable soil compressing plate and the dehydration roll wheel surface being arranged in extreme higher position on spoon shape shank.
11. roller type filter presses as claimed in claim 10, it is characterized in that, be in described adjustable soil compressing plate and described pressure mud roller set the pressure mud running roller of extreme higher position tangent time, in the between the pressure mud running roller being in extreme higher position in adjustable soil compressing plate and pressure mud roller set and the central point line of the dehydration running roller being arranged in extreme higher position on spoon shape shank the 5th, angle is acute angle.
12. roller type filter presses as claimed in claim 11, it is characterized in that, in the described 5th, angle is 70 °.
13. roller type filter presses as claimed in claim 3, it is characterized in that, in the dewatered sludge discharging opening of described sludge dehydration device, be provided with a dump plate, the inner of described dump plate contacts with the dehydration roll wheel surface being arranged in extreme higher position on spoon shape shank.
14. roller type filter presses as claimed in claim 3, it is characterized in that, described sludge dehydration device also comprises enrichment region hydrops groove and drying zone hydrops groove, wherein said enrichment region hydrops slot is in being arranged in each dehydration running roller in spoon shape flat bottoms and being arranged in each dehydration running roller on spoon shape lip and being arranged in below one of extreme lower position on spoon shape shank dehydration running roller, and described drying zone hydrops slot is in being arranged on spoon shape shank except below all the other dehydration running rollers of a dehydration running roller of extreme lower position; The equal opening of enrichment region hydrops groove and drying zone hydrops groove top, and be provided with drainpipe in both bottoms.
15. roller type filter presses as claimed in claim 14, is characterized in that, be provided with drying zone and amass liquid level of liquid tank meter in described drying zone hydrops groove.
16. roller type filter presses as claimed in claim 1, it is characterized in that, described pressure mud running roller comprises a pressure mud rolling axle and some minor diameters pressure mud plectane and some major diameters and presses mud plectane, the two ends of wherein said pressure mud rolling axle have outward extending in order to bearings mounted collar end, and the two ends of this pressure mud rolling axle are provided with external thread part, some minor diameter pressure mud plectanes and some major diameters pressure mud plectane are enclosed within described pressure mud rolling axle, the external thread part at described pressure mud rolling axle two ends is respectively rotary with two block pressur plates, four block pressur plates are jointly by some minor diameter pressure mud plectanes and the clamping of some major diameters pressure mud plectane, wherein each block minor diameter pressure mud plectane is clipped between two blocks of major diameter pressure mud plectanes, the external diameter of minor diameter pressure mud plectane is less than the external diameter of major diameter pressure mud plectane, thus make between two blocks of major diameter pressure mud plectanes, to form a pressure mud groove of nipping for the major diameter pressure mud plectane on another pressure mud running roller.
17. roller type filter presses as claimed in claim 16, is characterized in that, the thickness of described minor diameter pressure mud plectane is greater than the thickness of major diameter pressure mud plectane.
18. roller type filter presses as claimed in claim 1, it is characterized in that, described dehydration running roller comprise a dehydration roll wheel shaft and some minor diameters dehydration plectane and some major diameters dehydration plectane, the two ends of wherein said pressure mud rolling axle have outward extending in order to bearings mounted collar end, and the two ends of this pressure mud rolling axle are provided with external thread part, some minor diameter dehydration plectanes and some major diameters dehydration plectane are enclosed within described dehydration roll wheel shaft, the external thread part at described dehydration roll wheel shaft two ends is respectively rotary with two block pressur plates, four block pressur plates are jointly by some minor diameter dehydration plectanes and the clamping of some major diameters dehydration plectane, wherein each block minor diameter dehydration plectane is clipped between two blocks of major diameter dehydration plectanes, the external diameter of minor diameter dehydration plectane is less than the external diameter of major diameter dehydration plectane, thus make between two blocks of major diameter dehydration plectanes, to form a drench pit of nipping for the major diameter dehydration plectane on another pressure mud running roller.
19. roller type filter presses as claimed in claim 18, is characterized in that, the thickness of described minor diameter dehydration plectane is greater than the thickness of major diameter dehydration plectane.
20. roller type filter presses as claimed in claim 1, it is characterized in that, described mud mixing arrangement comprises a mud mixing cell body and is arranged on the rabbling mechanism in described mud mixing cell body, the top of described mud mixing cell body is opened wide, and offers described water-containing sludge discharging opening on the frid top of this mud mixing cell body side; Described mud mixing cell body is also provided with liquid level gauge, described liquid level gauge has a high water level monitoring probe and a low water level detection probe, wherein, the liquid level that described high water level detection probe detects is concordant with the extreme higher position of described water-containing sludge discharging opening, and the liquid level that described low water level detection probe detects is concordant with the extreme lower position of described water-containing sludge discharging opening.
21. roller type filter presses as claimed in claim 20, it is characterized in that, described mud mixing arrangement also comprises a flow control board, and described flow control board slides and is inserted on described water-containing sludge discharging opening, in order to regulate the flow of water-containing sludge discharging opening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310007238.2A CN103007597B (en) | 2013-01-08 | 2013-01-08 | Roller type filter press |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310007238.2A CN103007597B (en) | 2013-01-08 | 2013-01-08 | Roller type filter press |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103007597A CN103007597A (en) | 2013-04-03 |
| CN103007597B true CN103007597B (en) | 2015-08-12 |
Family
ID=47957037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310007238.2A Active CN103007597B (en) | 2013-01-08 | 2013-01-08 | Roller type filter press |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103007597B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104671629A (en) * | 2013-11-29 | 2015-06-03 | 季华林 | Large-size construction slurry and river course silt treatment device |
| CN103663919A (en) * | 2013-12-27 | 2014-03-26 | 吴江市华宏纺织丝绸有限公司 | Dyeing sludge dewatering tank |
| CN104984583B (en) * | 2015-07-28 | 2018-01-09 | 上海艾澜达泵业有限公司 | A kind of food garbage solid-liquid separating equipment for oil water separator |
| CN107419580A (en) * | 2017-06-20 | 2017-12-01 | 郭鹏 | Disc stack multiple roll filtrate machine |
| CN110563302B (en) * | 2019-09-26 | 2023-12-08 | 华南理工大学 | Rolling type auxiliary transmission mechanism for filter pressing crawler belt and application thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2592641Y (en) * | 2002-12-17 | 2003-12-17 | 王万玉 | Sludge thichening and dewatering equipment |
| CN101417513A (en) * | 2008-11-13 | 2009-04-29 | 华章电气（桐乡）有限公司 | Pressure filter without filter cloth |
| CN201406369Y (en) * | 2009-05-19 | 2010-02-17 | 张鑫珩 | Continuous twin-roll counter-pressure dewaterer |
| CN203060937U (en) * | 2013-01-08 | 2013-07-17 | 上海大团环保科技有限公司 | Roller type pressure filter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006334524A (en) * | 2005-06-02 | 2006-12-14 | Japan Science & Technology Agency | Belt-type deliquoring apparatus |
-
2013
- 2013-01-08 CN CN201310007238.2A patent/CN103007597B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2592641Y (en) * | 2002-12-17 | 2003-12-17 | 王万玉 | Sludge thichening and dewatering equipment |
| CN101417513A (en) * | 2008-11-13 | 2009-04-29 | 华章电气（桐乡）有限公司 | Pressure filter without filter cloth |
| CN201406369Y (en) * | 2009-05-19 | 2010-02-17 | 张鑫珩 | Continuous twin-roll counter-pressure dewaterer |
| CN203060937U (en) * | 2013-01-08 | 2013-07-17 | 上海大团环保科技有限公司 | Roller type pressure filter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103007597A (en) | 2013-04-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103007597B (en) | Roller type filter press | |
| CN201082371Y (en) | Drum vacuum filter | |
| CN204999792U (en) | Sludge dewatering system | |
| CN219652871U (en) | Sludge treatment device for water environment treatment | |
| CN106334367A (en) | Spiral filtration dehydrator | |
| CN208454757U (en) | A kind of dyeing waste water and sludge treating system | |
| CN106396331A (en) | A sludge concentration-dehydration-drying integrated treatment plant and a treating method thereof | |
| CN112811776A (en) | Treatment system and treatment method for papermaking sludge of recycled paper | |
| CN210163308U (en) | Disc type sludge dewatering machine | |
| CN105130161A (en) | Sludge dewatering system | |
| CN203060937U (en) | Roller type pressure filter | |
| CN215480481U (en) | A centrifugal filter-pressing dewatering device of mud for sewage treatment plant | |
| JPH0615117B2 (en) | Sludge condensing dewatering device | |
| CN209292191U (en) | Sludge dewatering equipment | |
| JP6803612B2 (en) | Pressurized rotary plate type solid-liquid separator | |
| CN207567099U (en) | A kind of belt type sludge filter press | |
| CN103288322A (en) | Sludge modification deep dewaterer | |
| CN216170203U (en) | Centrifugal feeding device for filter press | |
| CN107619166A (en) | A kind of high-effective sludge dehydration device | |
| CN202316114U (en) | Built-in type magnetic separation pressure filtration dehydrator | |
| CN207031921U (en) | A kind of starching machine pressure preheating slurry roller | |
| CN202000191U (en) | High-compression-ratio helical squeezing water extractor | |
| CN201002344Y (en) | Double-screw presser | |
| CN108929015A (en) | A kind of sludge dewatering treatment device | |
| CN203345647U (en) | Twin-wire pulp crushing and loosening screw conveyor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180316 Address after: Room 1, unit 1, unit 2, room 2, Daxing District Park Road, Beijing, Beijing, room 317, room 3 Patentee after: Beijing informed investment home intellectual property rights Operation Co., Ltd. Address before: 200120 Yongchun North Road, Pudong New Area, Pudong New Area, Shanghai Patentee before: Shanghai Datuan Environmental Science & Technology Co., Ltd. |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20180626 Address after: 410116 room 304, international business center, 188 environmental protection Middle Road, Yuhua District, Changsha, Hunan, China, 6 Patentee after: Hunan wisdom Water Environment Engineering Co., Ltd. Address before: 102600 Beijing Daxing District Paradise Road four House 2 Building 1 unit 3 level 317 room. Patentee before: Beijing informed investment home intellectual property rights Operation Co., Ltd. |
|
| TR01 | Transfer of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Roller type filter press Effective date of registration: 20191227 Granted publication date: 20150812 Pledgee: Bank of Changsha Limited by Share Ltd science and Technology Branch Pledgor: Hunan wisdom Water Environment Engineering Co., Ltd. Registration number: Y2019980001352 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20210205 Granted publication date: 20150812 Pledgee: Bank of Changsha Limited by Share Ltd. science and Technology Branch Pledgor: HUNAN WISDOM WATER ENVIRONMENTAL ENGINEERING Co.,Ltd. Registration number: Y2019980001352 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Roller filter press Effective date of registration: 20210506 Granted publication date: 20150812 Pledgee: Changsha branch of China Post Savings Bank Co.,Ltd. Pledgor: HUNAN WISDOM WATER ENVIRONMENTAL ENGINEERING Co.,Ltd. Registration number: Y2021980003275 |
|
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 410000 room 304, building 6, international enterprise center, 188 Huanbao Middle Road, Yuhua District, Changsha City, Hunan Province Patentee after: Hunan Zhishui Environmental Technology Co.,Ltd. Address before: 410116 room 304, international business center, 188 environmental protection Middle Road, Yuhua District, Changsha, Hunan, China, 6 Patentee before: HUNAN WISDOM WATER ENVIRONMENTAL ENGINEERING Co.,Ltd. |