CA2044897C - Filter press with cake removing devices - Google Patents
Filter press with cake removing devicesInfo
- Publication number
- CA2044897C CA2044897C CA002044897A CA2044897A CA2044897C CA 2044897 C CA2044897 C CA 2044897C CA 002044897 A CA002044897 A CA 002044897A CA 2044897 A CA2044897 A CA 2044897A CA 2044897 C CA2044897 C CA 2044897C
- Authority
- CA
- Canada
- Prior art keywords
- filter
- bars
- bar
- filter plates
- plates
- 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.)
- Expired - Lifetime
Links
- 239000004744 fabric Substances 0.000 claims abstract description 46
- 239000002002 slurry Substances 0.000 claims abstract description 5
- 239000012530 fluid Substances 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims 1
- 238000005406 washing Methods 0.000 abstract description 6
- 239000012065 filter cake Substances 0.000 description 14
- 239000010802 sludge Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000003213 activating effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B9/00—Presses specially adapted for particular purposes
- B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
- B30B9/04—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using press rams
- B30B9/045—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using press rams co-operating with several adjacent casings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B9/00—Presses specially adapted for particular purposes
- B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
- B30B9/04—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using press rams
- B30B9/047—Control arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Filtration Of Liquid (AREA)
Abstract
A filter press provided with filter plates supported vertically in a horizontal row in a frame structure and with filter cloth disposed between the filter plates for treating slurries introduced between the filter plates. The filter press includes bars supported at a height above the filter plates to support the filter cloth, shafts disposed orthogonally under the bars, cylinders to move the shafts towards and away from the bars, and vibrators mounted on the shafts to vibrate the shafts. The shafts are moved to come into contact with the bars, and the vibrators are actuated to make the bars vibrate to drop cake remaining on the filter cloth when the filter plates are opened. The filter press further includes photoemissive and photoreceptive devices for detecting deflection and sinking of the bars due to weight of the cake on the filter cloth, and wash pipes for washing down the filter plates and filter cloth.
Description
CA 02044897 1998-0~-13 A FILTE~ PBESS ~IT~ CAKE REMOVINC DEVICES
Background of the Invention ,.
Field of the Invention This invention relates to a filter press, and in particular to a filter press provided with devices for removing filter cake or sludge from filter cloth, such as filter cloth vibrating devices, washing devices and so on.
Description of the Prior Art In the prior art, a filter press with vibrating devices for vibrating filter cloth for removing filter cake is well known as disclosed in Japanese Patent (Y2) 56-33,614. Also, a filter press with filter cloth washing machine is well known as disclosed in Japanese Patent (A) 54-51,069.
In these devices, filter cloth is vibrated for a certain time, or a number of times. After the vibration, the filter cloth is usually washed for a certain time.
However, these devices sometimes fail to remove a part or the whole of the filter cake because the vibration and washing are not enough to drop it if the cake is adhesive or difficult to remove. The filter cake tends to remain partially particularly at a lower part of a seal portion of a filter plate. In addition, a conventional filter press is not provided with a device or sensor for ~ t ~
CA 02044897 1998-0~-13 detecting if the filter cake is removed from the filter cloth. Hence, the filter cloth wears down partly if the filter press is used without removing the cake completely from the filter cloth and the filter plates.
Summary of the Invention It is therefore the primary object of the present invention to provide an improved filter press which can remove filter cake completely from filter cloth and filter plates.
It is a second object of the present invention to provide a filter press provided with a sensor for detecting if the filter cake is removed from the filter 1~ cloth and the filter plates.
B ~:
~;
~ ,~, CA 02044897 1998-0~-13 .~, The present invention in one aspect provides a filter press provided with a plurality of filter plates supported vertically in a horizontal row in a framestructure and with filter cloth disposed between said filter plates for keating slurries introduced under pressure between said filter plates, said filter press S comprlsmg:
a plurality of bars extending over a full width of said filter plates and carried by said filter plates at a predetermined height above said filter plates for supporting said filter cloth;
each filter plate including a first pair of springs mounted above each said filter plate and under each said bar on bar supporting rods attached to said filter plate, said springs supporting said bars upon said filter plates at said predetermined height above said filter plates for causing said bar to vibrate on said spring when said bar is subjected to force;
a pair of shafts disposed substantially orthogonally to said plurality of bars and arranged under said plurality of bars movably so as to come into contact therewith;
driving devices for moving said shafts toward and away from said plurality of bars;
vibrating devices for vibrating said shafts so that the vibrations of said shafts may be transmitted to said plurality of bars; and rotatable levers which are rotatably attached to respective lower ends of said filter plates and which are associated with each other, each of said rotatable levers having a free end to which a wash head pipe is fixedly mounted, said wash head pipe being extended over said full width of said filter plate and provided with nozzles spaced along full length of said head pipe.
~}
CA 02044897 1998-0~-13 , . ,~.
'..._ The shaft is moved by the driving device to come into contact with the bars, and the vibrating device is actuated to make the bars vibrate through the shaft to drop the cake remaining on the filter cloth when the filter plates are 5 opened.
The bars may be supported on springs at supporting points, and further springs may be disposed on the bars at the supporting points whereby the bars are vibrated efficiently on the spring or between the springs when the shaft is vibrated.
The filter press of the present invention may further include devices to detect deflection and sinking of the bars due to weight of the remaining cake onthe filter cloth. If the deflection and/or sinking is detected, the bars are vibrated to remove the filter cake.
In a further aspect the invention provides a filter press provided with a plurality of filter plates supported vertically in a horizontal row in a frame structure and with filter cloth disposed between said filter plates for treatingslurries mtroduced under pressure between said filter plates, said filter press comprlsmg:
a plurality of bars extending over a full width of said filter plates and carried by said filter plates at a predetermined height above said filter plates for supporting said filter cloth;
each filter plate including a first pair of springs mounted above each said filter plate and under each said bar on bar supporting rods attached to said filter plate, said springs supporting said bars upon said filter plates at said predetermined height above said filter plates for causing said bar to vibrate on said spring when said bar is subjected to force;
-3a -L~
CA 02044897 1998-0~-13 -vibrating devices mounted on said bars, for vibrating said bars;
at least one photoemissive device and photoreceptive device for detecting deflection and sinking of said bars out of said predetermined height caused by weight of remaining cake on said filter cloth, said photoemissive device emitting a light beam which passes under said bars which are at said predetermined height; and rotatable levers which are rotatably attached to respective lower ends of said filter plates and which are associated with each other, each of said rotatable levers having a free end to which a wash head pipe is fixedly mounted, said wash head pipe being extended over said full width of said filter plate and provided with nozzles spaced along full length of said head pipe.
Brief Description of the Drawings Fig. 1 is a perspective drawing showing a filter -3b-~' CA 02044897 1998-0~-13 press of the present invention.
Fig. 2 is a front schematic view of the filter press taken on an arrow II shown in Fig. 1.
Fig. 3 is an enlarged sectional side view of the filter press, taken on the cutting plane line III-III in Fig. 2.
Fig. 4 is a side view showing a device of the filter press for enhancing vibration of a bar which supports filter cloth between filter plates.
Fig. 5 is an enlarged partial front view of the filter press, showing a washing device disposed at lower ends of filter plates of the filter press.
Description of the Preferred Embodiments Now further objects and examples of the present invention will be described in detail with reference to the accompanying drawings.
In Fig. 1, a filter press 1 of the present invention is shown. The filter press 1 has a frame structure mainly consisted of three frames 2 and a pair of horizontal beams 3 fixed to both sides of the frames 2. A
plurality of filter plates 4 are disposed vertically in the frame structure 2, 3. Each of the filter plates 4 has a pair of arms 11 at both sides and is slidably supported on the beams 3 through the arms 11.
Now, general structure of the filter press is . ~ CA 02044897 1998-0~-13 ~,_ .,_ briefly e~plained. The structure is known in the prior arts. The filter plates 4 are moved horizontally along the beams 3 to close one another by use of chains 6 connected to both sides of the filter plates 4. The chains 6 are driven by a motor 5. After the filter plates 4 are closed, the filter plates 4 are clamped by activating a clamping cylinder 7 while slurry is fed under pressure from a feed hose 9 through a hole 39 formed at the top of the filter plate 4 into a filter room consisted of depressions 18 formed in two adjacent filter plates 4.
Filtrate which has passed through filter cloth 19 is discharged from discharging holes (not shown) disposed in the filter plates 4. Therefore, filter cake 10 remains on filtcr cloth in a filter room or depressions 18, 18 of the filter plates 4.
Then, compressed air is introduced into the room 18, 18 through the filtrate discharging holes to detach the filter cake 10 from the filter cloth 19 and the filter plates 4. After it, the filter plates 4 are opened as shown in Fig. 1, and subse~uently filter cake 10 is dropped, or discharged from the plates 4 of itself due to its weight.
The filter press 1 is provided with some devices which are features of this invention. The devices detect 2., ii' filter cake 10 remain~ on filter cloth 19 and remove the filter cake 10 remairling on the filter cloth 19 by vit)rating and washing the ~ lter cloth 19. Now, B' ~q ~ ~
CA 02044897 1998-0~-13 description is made about the devices.
In Figs. 1 and 2, a pair of brackets 30 are mounted on the frames 2. The brackets 30 extend rearwards along the frames 2. A pair of fluid cylinders 32 are mounted on both ends of each of the brackets 30, and piston rods 33 of the cylinders 32 extend downwards through holes formed in the brackets 30. A pair of shafts 34 extended between the frames 2 are fixed to free ends of the piston rods 33 of the fluid cylinders 32 so that the shafts 34 can be supported by the piston rods 33 to move vertically when the cylinders 32 are actuated.
On the other hand as shown in detail in Fig. 3, the filter plate has a pair of shoulders 12 at both sides, and a pair of upright round bars 13 are fixed to the shoulders 12. A lower and an upper plates 20 spaced are fixed to each of the upright round bars 13. A spring 14, for example, coil spring is disposed on the lower plate 20 and around the upright round bar 13. A horizontal bar 16 extended over full width of the filter plate and having holes (not shown) at both sides is mounted on the springs 14, 14 while the upright round bars 13 penetrate the horizontal bar 16 through the holes. A pad is inserted between the upper plate 20 and the horizontal bar 16.
Therefore, the horizontal bar 16 normally lies at a predetermined height above the filter plate and vibrates between the upper and lower plates 20 when subject to vertical impact force or vibrating force.
CA 02044897 1998-0~-13 A further coil spring 15 may be disposed around the upright round bar 13 but on the horizontal bar 16 as shown in Fig. 4, so that the spring 15 is between the upper plate 20 fixed to the upright round bar 13 alld the horizontal bar 16. In this case, the horizontal bar 16 for supporting the filter cloth 19 is vibrated efficiently between the upper and lower plates 20 when subject to impact load or vibrating force.
Filter cloth 19 is hung from the horizontal bar 16 and extended downwards up to a lower end of the filter plate.
The two shafts 34 extending in the longitudinal direction orthogonal to the horizontal bars 16 are below both ends of the horizontal bars 16, or detached from the horizontal bars 16. Each of the shafts 34 are provided with at least one vibrator 35, however, for example, two vibrators 35 are mounted on both ends of the shaft 34 as shown in Fig. 2. Preferably, the vibrator 35 may be mounted on the shaft 34 at each point under the horizontal bars 16.
The filter plate 4 is provided at lower corners with a pair of levers 17 which are rotatable around an axis parallel to the horizontal bar 16 as shown in Figs.
2, 3 and 5. A wash head pipe 28 extended over the width of the filter plate is fixed to the levers 17. The wash head pipe 28 has a plurality of nozzles 29 spaced along the head pipe 28, and is connected to a water feed pipe 8.
CA 02044897 1998-0~-13 At least a pair of fluid cylinders 21 facing each other are rotatably mounted on the frames 2. The levers 17 are connected not only to one another but also to free ends of piston rods 22 of the cylinders 21 by wires 23 so that ends of the wires 23 can be free to rotate with the levers 17 and the piston rods 22 at connecting points.
Therefore, all the levers 17 are rotated at the same time, and the nozzles 29 are faced towards a surface of the filter plate when one of the two piston rods 22 is plunged into the cylinder 21 and the other is extruded.
A pair of photoemissive devices 36 are mounted on the left-hand bracket 30 while a pair of photoreceptive devices 37 facing the photoemissive devices respectively are mounted on the right-hand bracket 30 (Figs. 1 and 2).
The photoreceptive device 37 may be a CCD camera, photo tube, or other known sensor. Light beams emitted from the photoemissive devices 36 pass under the horizontal bars 16 which are at the predetermined height and are sensed by the photoreceptive devices 37 when all the horizontal bars 16 lie at the height and do not obstruct the beams. If the beam are obstructed by some of horizontal bars 16 deflected and/or sunk, the photoreceptive devices 37 can not sense the beams. Therefore, it is understood that filter cake 10 is remaining on the filter cloth 19 of one or some of horizontal bars 16.
Now, description will be made about the use of the devices for removing remaining cake 10. When the filter CA 02044897 1998-0~-13 plates 4 are opened, the horizontal bars 16 go down suddenly due to the weight of the cake 10 on the filter cloth 19 causing the springs 14 under the horizontal bars 16 to contract to the minimum size and come into collision with the lower plates 20. Hence, the cakes 10 drop from the filter plates due to the impact caused by the collision. However, a part or the whole of the cake 10 remains sometimes in one or more of the filter plates, and sludge still adheres to the filter cloth 19 of all the filter plates 4.
If the remaining cake 10 is detected by the photoemissive and photoreceptive devices 36, 37, the fluid cylinders 32 are actuated to plunge the piston rods 33 to lift the shafts 34 and therefore the horizontal bars 16 until the horizontal bars 16 are raised up to the predetermined height, or a higher level than the predetermined height when upper springs 15 are disposed on the horizontal bars 16 as shown in Fig. 4. Limit switches 38 are mounted on the frames 2 to detect if the shafts 34 are at a certain height where the horizontal bars 16 are at the predetermined height or the level and to disactivate the cylinders 32 when the shafts 34 are at the certain height.
By the operation of the limits switches 38, the shafts 34 suddenly fall down to a lowest position which is lower than the lower plate 20. Therefore, the horizontal bars 16 are vibrated on the springs 14 or between the CA 02044897 1998-0~-13 springs 14 and 15. As a resuIt of the vibration, the remaining cake 10 is dropped from the filter cloth 19.
Whether the cake 10 is removed is detected by the photoemissive and photoreceptive devices 36, 37. The shafts 34 are again raised, if necessary as a result of the detection.
After the cake 10 is removed from the filter cloth 19, then sludge adhering to the filter cloth 19 and filter plates are removed. To remove the sludge, the shafts 34 are raised by activating the cylinders 32 until they come into contact with the both ends of the horizontal bars 16 which are lying at the predetermined height after the vibration. Then, the vibrators 35 mounted on the shafts 34 are activated to give the horizontal bars 16 vibrations. The vibrations of the horizontal bars 16 are enhanced because the bars 16 are on the spring 14, or between the springs 14 and 15. While the horizontal bars 16 are vibrated, the rotating cylinders 21 are successively activated so that the nozzles 29 of the wash head pipe 28 supplied with water from the water feed pipe 8 can wash down every part of the filter cloth 19 and of the surfaces of the filter plates.
Accordingly, the cake and sludge are completely removed from the filter cloth 19 and plates 4.
In the above description, the filter press 1 is provided with the shafts 34 for vibrating the horizontal bars 16. However, the shafts 34 may be removed from the CA 02044897 1998-0~-13 filter press 1. In this case, vibrators 35 are attached directly to the horizontal bars 16. Therefore, the horizontal bars 16 are vibrated on spring 14 or between the springs 14 and 15 by the vibrators 35 mounted on the bars 16.
In addition, the springs 14 and 15 may be removed from the filter press 1. In this case, the deflection of the horizontal bars 16 due to the remaining cake is detected by the sensors, and then the cake is dropped by vibrating of the bars 16 with the vibrators 35.
It is clear that any combination of elements which are features of the present invention is made not limiting the examples described above.
25,
Background of the Invention ,.
Field of the Invention This invention relates to a filter press, and in particular to a filter press provided with devices for removing filter cake or sludge from filter cloth, such as filter cloth vibrating devices, washing devices and so on.
Description of the Prior Art In the prior art, a filter press with vibrating devices for vibrating filter cloth for removing filter cake is well known as disclosed in Japanese Patent (Y2) 56-33,614. Also, a filter press with filter cloth washing machine is well known as disclosed in Japanese Patent (A) 54-51,069.
In these devices, filter cloth is vibrated for a certain time, or a number of times. After the vibration, the filter cloth is usually washed for a certain time.
However, these devices sometimes fail to remove a part or the whole of the filter cake because the vibration and washing are not enough to drop it if the cake is adhesive or difficult to remove. The filter cake tends to remain partially particularly at a lower part of a seal portion of a filter plate. In addition, a conventional filter press is not provided with a device or sensor for ~ t ~
CA 02044897 1998-0~-13 detecting if the filter cake is removed from the filter cloth. Hence, the filter cloth wears down partly if the filter press is used without removing the cake completely from the filter cloth and the filter plates.
Summary of the Invention It is therefore the primary object of the present invention to provide an improved filter press which can remove filter cake completely from filter cloth and filter plates.
It is a second object of the present invention to provide a filter press provided with a sensor for detecting if the filter cake is removed from the filter 1~ cloth and the filter plates.
B ~:
~;
~ ,~, CA 02044897 1998-0~-13 .~, The present invention in one aspect provides a filter press provided with a plurality of filter plates supported vertically in a horizontal row in a framestructure and with filter cloth disposed between said filter plates for keating slurries introduced under pressure between said filter plates, said filter press S comprlsmg:
a plurality of bars extending over a full width of said filter plates and carried by said filter plates at a predetermined height above said filter plates for supporting said filter cloth;
each filter plate including a first pair of springs mounted above each said filter plate and under each said bar on bar supporting rods attached to said filter plate, said springs supporting said bars upon said filter plates at said predetermined height above said filter plates for causing said bar to vibrate on said spring when said bar is subjected to force;
a pair of shafts disposed substantially orthogonally to said plurality of bars and arranged under said plurality of bars movably so as to come into contact therewith;
driving devices for moving said shafts toward and away from said plurality of bars;
vibrating devices for vibrating said shafts so that the vibrations of said shafts may be transmitted to said plurality of bars; and rotatable levers which are rotatably attached to respective lower ends of said filter plates and which are associated with each other, each of said rotatable levers having a free end to which a wash head pipe is fixedly mounted, said wash head pipe being extended over said full width of said filter plate and provided with nozzles spaced along full length of said head pipe.
~}
CA 02044897 1998-0~-13 , . ,~.
'..._ The shaft is moved by the driving device to come into contact with the bars, and the vibrating device is actuated to make the bars vibrate through the shaft to drop the cake remaining on the filter cloth when the filter plates are 5 opened.
The bars may be supported on springs at supporting points, and further springs may be disposed on the bars at the supporting points whereby the bars are vibrated efficiently on the spring or between the springs when the shaft is vibrated.
The filter press of the present invention may further include devices to detect deflection and sinking of the bars due to weight of the remaining cake onthe filter cloth. If the deflection and/or sinking is detected, the bars are vibrated to remove the filter cake.
In a further aspect the invention provides a filter press provided with a plurality of filter plates supported vertically in a horizontal row in a frame structure and with filter cloth disposed between said filter plates for treatingslurries mtroduced under pressure between said filter plates, said filter press comprlsmg:
a plurality of bars extending over a full width of said filter plates and carried by said filter plates at a predetermined height above said filter plates for supporting said filter cloth;
each filter plate including a first pair of springs mounted above each said filter plate and under each said bar on bar supporting rods attached to said filter plate, said springs supporting said bars upon said filter plates at said predetermined height above said filter plates for causing said bar to vibrate on said spring when said bar is subjected to force;
-3a -L~
CA 02044897 1998-0~-13 -vibrating devices mounted on said bars, for vibrating said bars;
at least one photoemissive device and photoreceptive device for detecting deflection and sinking of said bars out of said predetermined height caused by weight of remaining cake on said filter cloth, said photoemissive device emitting a light beam which passes under said bars which are at said predetermined height; and rotatable levers which are rotatably attached to respective lower ends of said filter plates and which are associated with each other, each of said rotatable levers having a free end to which a wash head pipe is fixedly mounted, said wash head pipe being extended over said full width of said filter plate and provided with nozzles spaced along full length of said head pipe.
Brief Description of the Drawings Fig. 1 is a perspective drawing showing a filter -3b-~' CA 02044897 1998-0~-13 press of the present invention.
Fig. 2 is a front schematic view of the filter press taken on an arrow II shown in Fig. 1.
Fig. 3 is an enlarged sectional side view of the filter press, taken on the cutting plane line III-III in Fig. 2.
Fig. 4 is a side view showing a device of the filter press for enhancing vibration of a bar which supports filter cloth between filter plates.
Fig. 5 is an enlarged partial front view of the filter press, showing a washing device disposed at lower ends of filter plates of the filter press.
Description of the Preferred Embodiments Now further objects and examples of the present invention will be described in detail with reference to the accompanying drawings.
In Fig. 1, a filter press 1 of the present invention is shown. The filter press 1 has a frame structure mainly consisted of three frames 2 and a pair of horizontal beams 3 fixed to both sides of the frames 2. A
plurality of filter plates 4 are disposed vertically in the frame structure 2, 3. Each of the filter plates 4 has a pair of arms 11 at both sides and is slidably supported on the beams 3 through the arms 11.
Now, general structure of the filter press is . ~ CA 02044897 1998-0~-13 ~,_ .,_ briefly e~plained. The structure is known in the prior arts. The filter plates 4 are moved horizontally along the beams 3 to close one another by use of chains 6 connected to both sides of the filter plates 4. The chains 6 are driven by a motor 5. After the filter plates 4 are closed, the filter plates 4 are clamped by activating a clamping cylinder 7 while slurry is fed under pressure from a feed hose 9 through a hole 39 formed at the top of the filter plate 4 into a filter room consisted of depressions 18 formed in two adjacent filter plates 4.
Filtrate which has passed through filter cloth 19 is discharged from discharging holes (not shown) disposed in the filter plates 4. Therefore, filter cake 10 remains on filtcr cloth in a filter room or depressions 18, 18 of the filter plates 4.
Then, compressed air is introduced into the room 18, 18 through the filtrate discharging holes to detach the filter cake 10 from the filter cloth 19 and the filter plates 4. After it, the filter plates 4 are opened as shown in Fig. 1, and subse~uently filter cake 10 is dropped, or discharged from the plates 4 of itself due to its weight.
The filter press 1 is provided with some devices which are features of this invention. The devices detect 2., ii' filter cake 10 remain~ on filter cloth 19 and remove the filter cake 10 remairling on the filter cloth 19 by vit)rating and washing the ~ lter cloth 19. Now, B' ~q ~ ~
CA 02044897 1998-0~-13 description is made about the devices.
In Figs. 1 and 2, a pair of brackets 30 are mounted on the frames 2. The brackets 30 extend rearwards along the frames 2. A pair of fluid cylinders 32 are mounted on both ends of each of the brackets 30, and piston rods 33 of the cylinders 32 extend downwards through holes formed in the brackets 30. A pair of shafts 34 extended between the frames 2 are fixed to free ends of the piston rods 33 of the fluid cylinders 32 so that the shafts 34 can be supported by the piston rods 33 to move vertically when the cylinders 32 are actuated.
On the other hand as shown in detail in Fig. 3, the filter plate has a pair of shoulders 12 at both sides, and a pair of upright round bars 13 are fixed to the shoulders 12. A lower and an upper plates 20 spaced are fixed to each of the upright round bars 13. A spring 14, for example, coil spring is disposed on the lower plate 20 and around the upright round bar 13. A horizontal bar 16 extended over full width of the filter plate and having holes (not shown) at both sides is mounted on the springs 14, 14 while the upright round bars 13 penetrate the horizontal bar 16 through the holes. A pad is inserted between the upper plate 20 and the horizontal bar 16.
Therefore, the horizontal bar 16 normally lies at a predetermined height above the filter plate and vibrates between the upper and lower plates 20 when subject to vertical impact force or vibrating force.
CA 02044897 1998-0~-13 A further coil spring 15 may be disposed around the upright round bar 13 but on the horizontal bar 16 as shown in Fig. 4, so that the spring 15 is between the upper plate 20 fixed to the upright round bar 13 alld the horizontal bar 16. In this case, the horizontal bar 16 for supporting the filter cloth 19 is vibrated efficiently between the upper and lower plates 20 when subject to impact load or vibrating force.
Filter cloth 19 is hung from the horizontal bar 16 and extended downwards up to a lower end of the filter plate.
The two shafts 34 extending in the longitudinal direction orthogonal to the horizontal bars 16 are below both ends of the horizontal bars 16, or detached from the horizontal bars 16. Each of the shafts 34 are provided with at least one vibrator 35, however, for example, two vibrators 35 are mounted on both ends of the shaft 34 as shown in Fig. 2. Preferably, the vibrator 35 may be mounted on the shaft 34 at each point under the horizontal bars 16.
The filter plate 4 is provided at lower corners with a pair of levers 17 which are rotatable around an axis parallel to the horizontal bar 16 as shown in Figs.
2, 3 and 5. A wash head pipe 28 extended over the width of the filter plate is fixed to the levers 17. The wash head pipe 28 has a plurality of nozzles 29 spaced along the head pipe 28, and is connected to a water feed pipe 8.
CA 02044897 1998-0~-13 At least a pair of fluid cylinders 21 facing each other are rotatably mounted on the frames 2. The levers 17 are connected not only to one another but also to free ends of piston rods 22 of the cylinders 21 by wires 23 so that ends of the wires 23 can be free to rotate with the levers 17 and the piston rods 22 at connecting points.
Therefore, all the levers 17 are rotated at the same time, and the nozzles 29 are faced towards a surface of the filter plate when one of the two piston rods 22 is plunged into the cylinder 21 and the other is extruded.
A pair of photoemissive devices 36 are mounted on the left-hand bracket 30 while a pair of photoreceptive devices 37 facing the photoemissive devices respectively are mounted on the right-hand bracket 30 (Figs. 1 and 2).
The photoreceptive device 37 may be a CCD camera, photo tube, or other known sensor. Light beams emitted from the photoemissive devices 36 pass under the horizontal bars 16 which are at the predetermined height and are sensed by the photoreceptive devices 37 when all the horizontal bars 16 lie at the height and do not obstruct the beams. If the beam are obstructed by some of horizontal bars 16 deflected and/or sunk, the photoreceptive devices 37 can not sense the beams. Therefore, it is understood that filter cake 10 is remaining on the filter cloth 19 of one or some of horizontal bars 16.
Now, description will be made about the use of the devices for removing remaining cake 10. When the filter CA 02044897 1998-0~-13 plates 4 are opened, the horizontal bars 16 go down suddenly due to the weight of the cake 10 on the filter cloth 19 causing the springs 14 under the horizontal bars 16 to contract to the minimum size and come into collision with the lower plates 20. Hence, the cakes 10 drop from the filter plates due to the impact caused by the collision. However, a part or the whole of the cake 10 remains sometimes in one or more of the filter plates, and sludge still adheres to the filter cloth 19 of all the filter plates 4.
If the remaining cake 10 is detected by the photoemissive and photoreceptive devices 36, 37, the fluid cylinders 32 are actuated to plunge the piston rods 33 to lift the shafts 34 and therefore the horizontal bars 16 until the horizontal bars 16 are raised up to the predetermined height, or a higher level than the predetermined height when upper springs 15 are disposed on the horizontal bars 16 as shown in Fig. 4. Limit switches 38 are mounted on the frames 2 to detect if the shafts 34 are at a certain height where the horizontal bars 16 are at the predetermined height or the level and to disactivate the cylinders 32 when the shafts 34 are at the certain height.
By the operation of the limits switches 38, the shafts 34 suddenly fall down to a lowest position which is lower than the lower plate 20. Therefore, the horizontal bars 16 are vibrated on the springs 14 or between the CA 02044897 1998-0~-13 springs 14 and 15. As a resuIt of the vibration, the remaining cake 10 is dropped from the filter cloth 19.
Whether the cake 10 is removed is detected by the photoemissive and photoreceptive devices 36, 37. The shafts 34 are again raised, if necessary as a result of the detection.
After the cake 10 is removed from the filter cloth 19, then sludge adhering to the filter cloth 19 and filter plates are removed. To remove the sludge, the shafts 34 are raised by activating the cylinders 32 until they come into contact with the both ends of the horizontal bars 16 which are lying at the predetermined height after the vibration. Then, the vibrators 35 mounted on the shafts 34 are activated to give the horizontal bars 16 vibrations. The vibrations of the horizontal bars 16 are enhanced because the bars 16 are on the spring 14, or between the springs 14 and 15. While the horizontal bars 16 are vibrated, the rotating cylinders 21 are successively activated so that the nozzles 29 of the wash head pipe 28 supplied with water from the water feed pipe 8 can wash down every part of the filter cloth 19 and of the surfaces of the filter plates.
Accordingly, the cake and sludge are completely removed from the filter cloth 19 and plates 4.
In the above description, the filter press 1 is provided with the shafts 34 for vibrating the horizontal bars 16. However, the shafts 34 may be removed from the CA 02044897 1998-0~-13 filter press 1. In this case, vibrators 35 are attached directly to the horizontal bars 16. Therefore, the horizontal bars 16 are vibrated on spring 14 or between the springs 14 and 15 by the vibrators 35 mounted on the bars 16.
In addition, the springs 14 and 15 may be removed from the filter press 1. In this case, the deflection of the horizontal bars 16 due to the remaining cake is detected by the sensors, and then the cake is dropped by vibrating of the bars 16 with the vibrators 35.
It is clear that any combination of elements which are features of the present invention is made not limiting the examples described above.
25,
Claims (9)
1. A filter press provided with a plurality of filter plates supported vertically in a horizontal row in a frame structure and with filter cloth disposed between said filter plates for treating slurries introduced under pressure between said filter plates, said filter press comprising:
a plurality of bars extending over a full width of said filter plates and carried by said filter plates at a predetermined height above said filter plates for supporting said filter cloth;
each filter plate including a first pair of springs mounted above each said filter plate and under each said bar on bar supporting rods attached to said filter plate, said springs supporting said bars upon said filter plates at said predetermined height above said filter plates for causing said bar to vibrate on said spring when said bar is subjected to force;
a pair of shafts disposed substantially orthogonally to said plurality of bars and arranged under said plurality of bars movably so as to come into contact therewith;
driving devices for moving said shafts toward and away from said plurality of bars;
vibrating devices for vibrating said shafts so that the vibrations of said shafts may be transmitted to said plurality of bars; and rotatable levers which are rotatably attached to respective lower ends of said filter plates and which are associated with each other, each of said rotatable levers having a free end to which a wash head pipe is fixedly mounted, said wash head pipe being extended over said full width of said filter plate and provided with nozzles spaced along full length of said head pipe.
a plurality of bars extending over a full width of said filter plates and carried by said filter plates at a predetermined height above said filter plates for supporting said filter cloth;
each filter plate including a first pair of springs mounted above each said filter plate and under each said bar on bar supporting rods attached to said filter plate, said springs supporting said bars upon said filter plates at said predetermined height above said filter plates for causing said bar to vibrate on said spring when said bar is subjected to force;
a pair of shafts disposed substantially orthogonally to said plurality of bars and arranged under said plurality of bars movably so as to come into contact therewith;
driving devices for moving said shafts toward and away from said plurality of bars;
vibrating devices for vibrating said shafts so that the vibrations of said shafts may be transmitted to said plurality of bars; and rotatable levers which are rotatably attached to respective lower ends of said filter plates and which are associated with each other, each of said rotatable levers having a free end to which a wash head pipe is fixedly mounted, said wash head pipe being extended over said full width of said filter plate and provided with nozzles spaced along full length of said head pipe.
2. The filter press according to Claim 1, wherein one said spring is disposed under said each bar at each supporting point where said bar is supported for causing said bar to vibrate on said spring when said bar is subjected to force.
3. The filter press according to Claim 2, wherein a further spring is disposed on each said bar at each said supporting point for causing said bar to vibrate between said two springs on and under said bar when said bar is subjected to force.
4. The filter press according to Claim 1, wherein said shaft is supported by said driving device to lie at a predetermined location which is under said bars.
5. The filter press according to Claim 4, wherein a pair of said shafts are supported at both ends by free ends of piston rods of fluid cylinders to lie at said predetermined location under both ends of said bars, and thereby moved towards and away from said ends of said bars.
6. The filter press according to Claim 1, wherein said vibrating device is mounted on said shaft.
7. The filter press according to anyone of Claims 1 to 3, wherein said filter press includes at least one photoemissive device and photoreceptive device for detecting deflection and sinking of said bars out of said predetermined height caused by weight of remaining cake on said filter cloth, said photoemissive device emitting a light beam which passes under said bars which are at said predetermined height.
8. The filter press according to Claim 1 wherein at least one of said levers of said filter press is connected by transmission means to free ends of piston rods of a pair of fluid cylinders rotatably mounted on said frame structure, thereby said lever is rotated for facing said nozzles towards variousparts of said filter plate when said piston rods are extruded and plunged.
9 A filter press provided with a plurality of filter plates supported vertically in a horizontal row in a frame structure and with filter cloth disposed between said filter plates for treating slurries introduced under pressure between said filter plates, said filter press comprising:
a plurality of bars extending over a full width of said filter plates and carried by said filter plates at a predetermined height above said filter plates for supporting said filter cloth;
each filter plate including a first pair of springs mounted above each said filter plate and under each said bar on bar supporting rods attached to said filter plate, said springs supporting said bars upon said filter plates at said predetermined height above said filter plates for causing said bar to vibrate on said spring when said bar is subjected to force;
vibrating devices mounted on said bars, for vibrating said bars;
at least one photoemissive device and photoreceptive device for detecting deflection and sinking of said bars out of said predetermined height caused by weight of remaining cake on said filter cloth, said photoemissive device emitting a light beam which passes under said bars which are at said predetermined height; and rotatable levers which are rotatably attached to respective lower ends of said filter plates and which are associated with each other, each of said rotatable levers having a free end to which a wash head pipe is fixedly mounted, said wash head pipe being extended over said full width of said filter plate and provided with nozzles spaced along full length of said head pipe.
a plurality of bars extending over a full width of said filter plates and carried by said filter plates at a predetermined height above said filter plates for supporting said filter cloth;
each filter plate including a first pair of springs mounted above each said filter plate and under each said bar on bar supporting rods attached to said filter plate, said springs supporting said bars upon said filter plates at said predetermined height above said filter plates for causing said bar to vibrate on said spring when said bar is subjected to force;
vibrating devices mounted on said bars, for vibrating said bars;
at least one photoemissive device and photoreceptive device for detecting deflection and sinking of said bars out of said predetermined height caused by weight of remaining cake on said filter cloth, said photoemissive device emitting a light beam which passes under said bars which are at said predetermined height; and rotatable levers which are rotatably attached to respective lower ends of said filter plates and which are associated with each other, each of said rotatable levers having a free end to which a wash head pipe is fixedly mounted, said wash head pipe being extended over said full width of said filter plate and provided with nozzles spaced along full length of said head pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002044897A CA2044897C (en) | 1991-06-18 | 1991-06-18 | Filter press with cake removing devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002044897A CA2044897C (en) | 1991-06-18 | 1991-06-18 | Filter press with cake removing devices |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2044897A1 CA2044897A1 (en) | 1992-12-19 |
| CA2044897C true CA2044897C (en) | 1999-01-05 |
Family
ID=4147859
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002044897A Expired - Lifetime CA2044897C (en) | 1991-06-18 | 1991-06-18 | Filter press with cake removing devices |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2044897C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113575847B (en) * | 2021-07-30 | 2025-05-30 | 道一(深圳)生物科技有限公司 | Noodles and preparation process thereof |
| IT202100030389A1 (en) * | 2021-12-01 | 2023-06-01 | Matec Srl | FILTER PRESS WITH TWIN STRUCTURE |
| CN117398821B (en) * | 2023-10-19 | 2024-04-05 | 江苏龙泰环保设备制造有限公司 | Wet electric purification system for sulfur-containing tail gas desulfurization after incineration |
-
1991
- 1991-06-18 CA CA002044897A patent/CA2044897C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2044897A1 (en) | 1992-12-19 |
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| EEER | Examination request | ||
| MKEX | Expiry |