JPH0339800B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dewatering device for sludge.

[Conventional technology]

It is well known that in order to dewater muddy materials such as sewage sludge, it is placed between a pair of water-permeable filter cloths and then pressurized. For example, special public relations
The belt screen press, also known as No. 15292, consists of two endless belt-shaped wire cloth webs each wrapped around a plurality of guide rolls.
A guiding device drives the two wire cross webs in the same direction while circumscribing each other over a certain travel distance, and a guide device moves mud into the space between the two wire cross webs circumscribing each other. In order to supply
A slurry supply device disposed in front of the above-mentioned certain traveling section and a pair of wire cross webs sandwiching the mud in the above-mentioned certain running section pass around the pressure roll. and a device that applies pressure from above the pair of webs to the sludge held between the webs, and an outlet for the dehydrated cake is provided at the rear of the above-mentioned certain running section. In addition, in the above-mentioned pressure section, this belt screen press presses a large number of pressure belts arranged at discrete positions in the width direction from above the pair of webs toward the pressure rolls. , it is designed to dehydrate mud under pressure.

Such a belt screen press type dehydrator does not depend on the tension of the pair of water-permeable webs that sandwich the sludge, but instead uses a pressure belt that is inscribed in one of the webs and tensioned.
Since the sludge is strongly compressed by the squeezing force acting between the belt and the pressure roll, excessive tension should not be applied to the water-permeable web holding the sludge. It does not need to be activated. Therefore, there is an advantage that there is little risk that the endlessly sewn portion of the web will break due to the tension acting on the web. In addition, in this type of dewatering machine, the portion of the endless band holding the muddy material is subjected to surface compression between the pressure belt and the pressure roll, so that a high dehydration rate can be obtained. It also has the following advantages.

In particular, the dewatering machine disclosed in Japanese Patent Publication No. 56-15292 is constructed with multiple strips of the above-mentioned pressure belt, and pressurizes the water-permeable outer web wrapped around the pressure roll. The multi-stripe pressure belt has the advantage of particularly high dewatering efficiency because the belts are spaced apart little by little in the width direction.

[Problem to be solved by the invention]

However, in this known dehydrator, it takes a lot of effort to keep the numerous endless pressure belts around the rolls that guide them at equal intervals. .

Furthermore, it takes a lot of effort to align the lengths of a large number of pressure belts and connect them endlessly.

When one of the pressure belts that is hung around the roll breaks, it must be replaced with a new one, but this pressure belt stretches during use, so if some of the pressure belts are replaced, This results in uneven pressure applied to the mud between the multiple pressure belts.

I had a problem like this.

In order to solve this problem, this invention wraps two pressure belts around the group of guide rolls one or more times, and also uses these two pressure belts to move the mud between them. The required number of pressure belts can be reduced to two by guiding the two endless bands held between each other so that pressure can be applied at two or more different positions in the width direction of the endless bands. The purpose is to provide a dewatering device for sludge that can be reduced to a book.

[Means to solve the problem]

In the sludge dewatering device according to the present invention, at least one of the two endless bands, each of which is wound around a plurality of guide rolls, is made of a water-permeable filtration medium, and the two The endless belts are driven in the same direction with a certain traveling section circumscribing each other, and in front of the certain traveling section, there is mud for supplying mud between the two endless belts. A feeding device for the shaped material is disposed, and in the above-mentioned certain running section, the two endless strips are compressed between at least one guide roll that guides the endless strips to form two endless strips. An endless belt pressurizing device is installed to dewater the mud between the areas, and at the rear of the above running section,
A discharge port is provided for discharging the dehydrated cake from between the two endless strips, and the endless strip pressurizing device is arranged at positions spaced apart from each other at appropriate intervals in the width direction of the endless strip. A sludge dewatering device comprising a pressure belt guided to run in contact with an endless belt and run together with the endless belt, the endless belt pressure device comprising at least three parallel rolls. and two pairs of direction change pulleys, each pair of which is arranged for each pressure belt, and a plurality of spiral windings circumscribing the above-mentioned set of at least three parallel rolls. and two endless pressure belts, both of which are wound around the two pairs of direction change pulleys, and each of the pressure belts has two belts at multiple locations in the width direction of the roll. The outer circumferential surface of the portion passed between the rolls is brought into pressure contact with the endless belt at appropriate intervals in the width direction of the endless belt, and the two pressure belts are , the set of at least three parallel rolls is wound in different helical directions of right-hand winding and left-hand winding, respectively, with the central position in the width direction of these rolls as a boundary, and each pressure belt However, in the width direction of the roll, the roll is wound around each pair of direction changing pulleys, and is guided in a circular manner.

〔Example〕

One embodiment will be described with reference to FIGS. 1 to 5. In FIG. 1, the endless band 1 located on the upper side is wound around a large number of guide rolls 3 to 16 inscribed therein and guide rolls 17 to 19 circumscribed therein. The endless band 2 located at the bottom in FIG.
The pair of endless bands 1 and 2 are wrapped around the guide rolls 21 to 34 inscribed therein and the guide rolls 35 and 36 circumscribed thereto. roll 21
The endless bands 1 and 2 of this embodiment are both made of a water-permeable filtration medium such as filter cloth. Further, among the guide rolls 3 to 19 and 21 to 36, which respectively guide the two endless bands 1 and 2, all the guide rolls except the guide rolls 18 and 36 are fixed at predetermined positions. is held in place by bearings (not shown),
Bearings (not shown) of the guide rolls 18 and 36
The two endless bands 1 and 2 are energized in the directions of arrows A and B in FIG. 1, respectively, and appropriate tension is applied to each of the two endless bands 1 and 2. Furthermore, when the endless belt 2 is driven to travel in the direction of arrow D by the driving force input from the drive source 20 to the guide roll 29, the endless belt 1 in contact with the two endless belts moves in conjunction with the driving force input from the drive source 20 to the guide roll 29. The vehicle is made to run in the direction of arrow C.

In the dewatering device of this embodiment, a mud supply trough 37 is disposed above the portion where the upper endless band 1 is stretched between the guide rolls 19 and 15.
Sludge is supplied onto the water-permeable endless belt 1 from the left end position of the mud supply trough 37 in FIG. The slurry supplied onto the endless belt 1 at the left end position of the gravity filtration zone 38 between the guide rolls 19 and 15 passes through this water-permeable endless belt 1.
While the sludge is running between the guide rolls 19 and 15 in the right direction in FIG. 1, it is filtered by the gravity of the sludge itself. For this reason, a filtrate receiving pan 39 is provided below this gravity filtration zone 38.

The sludge gravity-filtered by the filter cloth 1 in the gravity filtration zone 38 falls onto the endless belt 2 between the guide rolls 34 and 21, and the two endless belts 1 and 2 are circumscribed with each other. Two endless belts 1,
Sent between 2. One water permeable endless zone 1
is wound around the guide rolls 3 to 12 inscribed therein, and the other water-permeable endless band 2 is wound around the guide rolls 21 to 29 inscribed therein, in the section 40, the two endless bands 1, 2 are circumscribed with each other, and both endless bands 1 and 2 are pressed against each other by their own tension, so the mud S sandwiched between the two water permeable endless bands 1 and 2 is In this running section, pressure dewatering is performed by the tension of the endless bands 1 and 2.

At the rear of the pressurized dewatering section 40 in which the two endless belts 1 and 2 circumscribe each other and run in the same direction, there is a slurry that has been dehydrated between the two endless belts 1 and 2. A discharge port 41 for discharging the cake from between the two endless bands 1 and 2 is formed, and a pair of guide rolls 12 and 29 forming this discharge port 41 have a Endless bands 1 and 2 of parts that are guided in directions that move away from each other.
Scrapers 42 and 43 are provided opposite to each other for contacting the outer surface of and removing cake.

Further, in the dewatering apparatus of the present invention, the two endless belts 1 and 2 as described above are provided with at least one guide roll in a part of the pressurized dewatering section 40 in which the two endless belts 1 and 2 run with the mud sandwiched between them. An endless band pressing device 50 is disposed between the two endless bands to press the two endless bands toward the guide roll and pressurize the mud sandwiched between the two endless bands. The endless band pressurizing device 50 is configured to press against the inner circumferential surface of the endless band 2 and run together with the endless band 2 at discrete positions separated by appropriate intervals α in the width direction of the endless band 2. The endless belt pressurizing device 50 may be configured with a guided pressure belt made of a flat belt, a V-belt, a rope, etc. 51,5
2, 53, two pairs of direction change pulleys 54, 55,
54 and 55, and two flat pressure belts 60 and 60, respectively, are wound around the belts 54 and 55 as follows.

That is, as shown in FIG. 3, the two endless pressure belts 60, 60 are placed on the right side with the center of the width direction of the set of rolls 51, 52, 53 as the border. and one on the left (top and bottom in FIG. 3), and the right pressure belt 60 and the left pressure belt 60 are respectively distributed to one set of rolls 51, 52, 53. The directions of the spirals are different from each other. That is, the pressure belt 60 on the left side is selected to wind to the right, and the pressure belt 60 on the right side is selected to wind to the left. As each portion 60a approaches its end in the running direction, it gradually moves away from the center in the width direction. Of course, each pressure belt 60 is wound along the spiral direction with a pitch equal to the interval α, and each pressure belt 60 is provided with a pair of direction change pulleys 54 and 55, respectively. It's hot,
Each pressure belt 60 is guided from each outer position in the width direction toward the center position through each pair of direction changing pulleys 54 and 55 so as to form an annular shape in the width direction. ing.

Next, to explain the operation of the above embodiment, the endless band pressurizing device 50 presses against the inner circumferential surface of the endless band 2 at discrete positions separated by appropriate intervals in the width direction of the endless band 2. Therefore, since each section 60a of the multi-stripe pressure belt guided to run together with the endless belt 2 is composed of two endless pressure belts 60, 60, such a pressure In the case of the pressure device 50, if the bearing position of any one of the three rolls 51, 52, or 53 on which it is suspended is displaced, for example, the roll 5
By displacing the position 3 downward in FIG. 2, a desired tension can be applied to the pressure belt 60.
Moreover, this pressure belt 60 contacts the inner peripheral surface of the endless belt 2 at discrete positions in the width direction of the endless belt 2, as shown in FIG. The tensile force of each part 60a of the multiple threads acting on the slurry S by pushing it toward the surface can be made uniform at all times.

In addition, in the case where the tension of the pressure belt 60 can be adjusted by moving the position of the roll 53 up and down in FIG. 2, and the pulleys 54 and 55 are in the position shown in FIGS. If arranged in a relationship, for example, one-to-one direction change pulleys 54,
55, the center line along the running direction of the pressure belt portion 60e, that is, the point X in FIG.
A rotatable bearing frame (not shown) is provided with a fulcrum at a position corresponding to the line When the bearing is fixedly installed, by rotating the bearing frame about the X-X line as a fulcrum, the roll 53 can be vertically displaced in FIG. The bearing of the direction change pulley 54 is displaced, and the pressure belt 60
The tension of the pressure belt 60 can be adjusted while keeping it from coming off the direction change pulleys 54, 55.

And, in the endless belt pressurizing device 50 of this invention,
A pair of pressure belts 60, 60 are spirally wound around a set of rolls 51, 52, 53, with the center position in the width direction serving as a boundary, right-handed on the left side and left-handed on the right side. Since the pressure belt 60 is wrapped around each part 60a of the multiple strips that are in contact with the endless strip 2, the water-permeable endless strip 2 like a filter cloth extends from the center in the width direction to the left and right sides. In the traveling direction, each of the multiple sections 60a, which is gradually moved slightly outward, is equally pushed outward on both sides. Therefore, this endless band 2
Not only is there no risk that the endless band 2 will be biased in one direction in the width direction, but also the endless band 2 is subjected to a wrinkle removal action due to the above-mentioned pushing and spreading action on the endless band 2. .

In addition, in the above embodiment, each of the pressure belts 60, which are wound around a set of three rolls 51, 52, and 53 in a left-right symmetrical helical direction, is located at the upper and lower end positions in FIG. , an example in which the guide is guided in the direction of the direction changing pulley 54 after being in contact with the roll 53, but in other embodiments, as shown in FIG. The direction change pulleys 54 and 55 may be provided by selecting a position where the rolled roll 52 and the pressure belt portion 60d of the direction change pulley 54 do not contact the roll 53.
In that case, the tension of the pressure belt 60 can be easily adjusted by simply adjusting the position of the bearing of the roll 53 up and down. Furthermore, in another embodiment, as shown in FIG. 7, a pulley 59 is disposed below the roll 53, so that the pulley 59 between the roll 52 and the direction changing pulley 54 that has reached the lower end in FIG. The pressure belt portion 60d may be looped around this pulley 59. In this case, the position of this pulley 59 is adjusted up and down, and
In synchronization with the vertical fluctuation of the position, the bearing frame (not shown) of the direction change pulley 54 is moved to the above-mentioned - The tension of the pressure belt 60 can be adjusted by rotating and displacing it around the X axis.

In the embodiment shown in FIG. 1, the pair of mutually circumscribed endless bands 1 and 2 are separated from the guide rolls 27 and 52 that constitute the pressurizing device 50 thereof. 28, but in other embodiments, one or both of the guide rolls 27, 28 may be omitted, and the pair of endless bands 1, 2 may be wound directly onto the pressure belt 60. ,
The parts of the pair of endless bands 1 and 2 that are in contact with each part 60a of the multi-strip pressure belt between the rolls 51 and 52 are wound around the guide roll 10 by winding them around one or both of the rolls 51 and 52. You can also hang it (Figure 8).

Furthermore, in the embodiment shown in FIG.
Although an example is shown in which only one endless band pressure device 50 as described above is disposed, in other embodiments, the pressure device as described with respect to FIGS. 2 to 7 above may be If necessary, the pair of endless bands 1 and 2 may be arranged at any position in the pressurized dehydration zone in which they are circumscribed and guided.
15292), two or more may be installed.
Needless to say.

[Function and effect of the invention]

The embodiments of the sludge dewatering device according to the present invention have been described above, but the sludge dewatering device according to the present invention has two endless bands sandwiching the sludge S between them. , an endless band pressurizing device for pinching the endless band with the rolls guiding it, more specifically, an endless band pressurizing device that presses a large number of strips that touch the endless band at discrete intervals in the width direction of the endless band. In particular, the belt portion is two endless pressure belts wound in a helical direction circumscribing at least three parallel rolls, and the pressure belt is connected to two of the three rolls. The pressure belt is made up of parts that are stretched across the roll at multiple points in the width direction of the roll. The pressure belt is pressed against the endless belt at appropriately spaced positions in the width direction of the endless belt, and the pressure belt is wound around a set of three rolls in a spiral direction, Since the pressure belt is simply made to circulate in the width direction of the roll by hanging a direction change pulley, it is possible to use a known pressure belt with multiple threads in the width direction of the roll. It is possible to easily obtain a state in which a large number of belts are hung at evenly spaced positions by winding the belts at evenly spaced positions. This is because the pressure belt, which is wound around a set of three rolls in a spiral direction,
This is because if you apply a certain tension to it and run it, it will naturally be given equal spacing to the pitches of the spiral and become stable.

Furthermore, as described above, each pressure belt, which is wound around a set of rolls in a spiral direction with at least three belts, is given a certain tension,
The tension of each part of the multiple strips that contact the endless strip at discrete positions in the width direction and press the endless strip toward the guide roll is automatically made uniform.

Therefore, according to the present invention, all of the drawbacks mentioned at the beginning are eliminated.

Further, in the device of the present invention, the pair of pressure belts are wound around a set of three rolls in a symmetrical spiral direction with the center of symmetry in the width direction of the rolls as the center of symmetry. Therefore, in each part of the multiple stripes where these pressure belts are in contact with the endless belt, the water-permeable endless belt such as a filter cloth has each part on the left and right from the center in the width direction, in the running direction. Each of the sections of the multiple stripes that gradually move slightly toward the outside will be equally pushed outward on both sides. Therefore, this endless band not only has no risk of being biased in one direction in the width direction, but also due to the above-mentioned pushing and spreading action on the endless band, the endless band
The wrinkles are to be removed.

[Brief explanation of drawings]

Fig. 1 is a schematic side view showing an embodiment of the sludge dewatering device according to the present invention, Fig. 2 is a side view showing a portion of the endless band pressurizing device, and Fig. 3 is the same plane. Fig. 4 is a perspective view showing the action of the direction change pulley, Fig. 5 is a sectional view taken along the - line in Fig. 2, and Figs. 6 and 7 are respectively other embodiments of the endless band pressurizing device. FIG. 8 is a schematic side view of an endless band pressurizing device showing still another embodiment. 1, 2... Endless band, 3-36... Guide roll,
37...Sludge supply trough (sludge supply device), 41
... Cake discharge port, 50 ... Endless band pressurizing device,
51, 52, 53... Roll, 54, 55... Direction change pulley, 60... Pressure belt, 60a...
Pressure belt part, S...Mud.

Claims (1)

[Claims] 1 At least one of the two endless belts, each of which is wound around a plurality of guide rolls, is made of a water-permeable filtration medium, and these two endless belts circumscribe a certain running section with each other. A slurry supply device for supplying slurry between the two endless strips is installed at the front of the fixed traveling section. , In the above-mentioned certain running section, there is an endless roller for dewatering the mud between the two endless strips by squeezing the two endless strips with at least one guide roll that guides the endless strips. A band pressurizing device is provided, and a discharge port for discharging the dehydrated cake from between the two endless bands is provided at the rear of the above-mentioned running section. Dewatering of sludge consisting of a pressurizing belt, in which the pressure device is guided to run together with the endless band in contact with the endless band at positions spaced apart from each other at appropriate intervals in the width direction of the endless band. In the apparatus, the endless band pressure device is arranged in pairs for each of at least three parallel rolls and one pressure belt.
two pairs of direction change pulleys, and two endless rollers that are circumscribed around the set of at least three parallel rolls and wound in a helical direction multiple times and also wound around the two pairs of direction change pulleys. pressure belts, and the outer circumferential surface of the portion of each pressure belt that is passed between the two rolls at multiple locations in the width direction of the rolls is The above-mentioned two pressure belts are pressed against the endless belt at positions spaced apart from each other by appropriate intervals, and the above-mentioned two pressure belts are pressed against the above-mentioned set of at least three parallel rolls. The pressure belts are wound in different helical directions, right-handed and left-handed, with the center point in the width direction as a boundary, and each pressure belt is wound around each pair of direction change pulleys in the width direction of the roll. A device for dehydrating sludge, characterized in that the sludge is guided in an annular manner.