JPS58128298A - Belt press type dehydrator - Google Patents

Abstract

PURPOSE:To provide a belt press type dehydrator which prevents leakage of sludge, etc. by constituting the same in such a way that the spacings between weir plates and a filter cloth belt can be changed according to the rate of supplying of the sludge passing between the weir plates and the filter cloth belt. CONSTITUTION:The sludge supplied onto a filter cloth belt 1 in front of a gravity dehydrating section is conveyed in the direction of an arrow 19, and is first passed under a rear baffle bracket 29, where the sludge is distributed in the transverse direction of the belt 1 by baffle plates 33a- and is passed as sludge ridge of penked shape 53a-. In the stage when the sludge raked like ridge passes under a weir plate 46, the sludge is crushed with the plate 46 to form a sludge layer of a specified thickness which is then ploughed over with the front baffle plates 33b- in succession thereto to expose the belt surface and to squeeze the sludge, whereby the moisture content of the sludge is decreased. Since the plates 46, 47 are held elastically turned and energized by spring plates 48, 49, the angles of inclination fluctuate according to the fluctuations in the atm. of the sludge even if said amt. fluctuates; therefore, the sludge is throughly dammed up and is prevented from overflowing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a belt press type dehydrator having a gravity dewatering section, and in particular, a weir plate provided in the gravity dewatering section is elastically supported, and the weir plate prevents the filter fabric belt from being connected to the filter cloth belt. A belt press-type dewatering table is designed in which the distance between the weir plate and the filter cloth belt can be changed depending on the amount of sludge that is compressed between them.

In water treatment facilities, such as sewage treatment facilities, the sludge generated in the water treatment process is treated as shrinkage sludge with a water content of 96 to 9.
It is an 8-chi autumn product, which is 60-80% reduced by a dehydrator.
The water content is dehydrated and sent to charcoal, landfill, and other processing steps. In such a dehydrator, it is important to reduce the moisture content of the dehydrated cake as low as possible and maintain this state while ensuring dehydration processing capacity.

FIG. 1 shows a conventional belt press type dehydrator for sludge treatment. In the figure, both (1) and (2) are equipped with an endless filter cloth belt, and the supply hopper (3) and upper belt (1) are connected.
The sludge (4) supplied above passes through the gravity dewatering section (6) as the upper belt 1) advances in the direction of the arrow (5).
The direction of travel is reversed by the tension roller (7), and the upper belt (1) and lower belt (2) are overlapped at the wedge-shaped confluence section (8).
The driving roller (9), squeezing roller (10), Ill, and (13) pass through the outer periphery of the circle, are compressed by the tension of both belts, are dehydrated, and are compressed by the tension of both belts. The dehydrated cake (top) is discharged from the separation group u9 of the belt.

In this way, when the sludge comes out of the supply hopper (3), it contains a multivalued water content, and in the gravity dewatering section such as (6) or t6, the upper belt (1) or the lower belt (2) It acts as a filter, and due to its own weight, m! The moisture that has passed through the fabric of the fi belt is drawn down by the gravity of the casing and reaches the squeezing roller (l(2), υυ...), so the moisture in the sludge decreases! In order to make the dewatering effect due to pressure on the outer circumferential surface of these ridged rollers more effective, the dewatering rate 1r in the gravity dewatering section must be increased.
It is important to correct the problem.

By the way, in the gravity dehydration section, there is dirt '0F! If , is simply poured onto the belt and the sludge completely covers the belt surface, the belt's texture will be blocked by the sludge particles.
Water cannot penetrate or flow down smoothly. Therefore, it is necessary to remove all of the layered sludge, create a kind of ridge, and partially expose the surface of the filter cloth so that free water can flow away from that part.

Therefore, in the gravity dewatering section, there is a slight difference in the flow of sludge.
A baffle plate perpendicular to the filter cloth belt is installed in contact with the filter cloth belt, and this buckle plate separates the sludge into layers to efficiently perform droop dewatering.

However, in this case, the sludge is unevenly distributed in layers in one turn of the 141i belt, so if it is fed as is to the squeezing roller, the compressive force of the sludge due to belt tension will become uneven in the belt width direction. The moisture content deteriorates due to overcooking. In addition, if the mechanism of sludge in the upper and lower belt bends is uneven in the width direction, the filtration bend belt will meander and the chest will be close to the belt, which will not only reduce the durability of the belt, but also In such cases, it may lead to breakage. This tendency is specific to belt press type dewatering machines that sandwich sludge between long endless belts, and even when the MiJ full plate is not installed, the sludge supplied from the supply hopper (3) is , there is probably some non-uniformity, so it is necessary to smooth it out to a constant thickness. From this point of view, in the present invention, submerged weir-like weir plates are placed on the belt at regular intervals.
However, experiments have shown that the flow of sludge supplied from the hopper (3) is not always controlled at a constant level, so if the weir is fixed, the amount of sludge passing through will be reduced. It was discovered that when the amount of water increases, the dammed sludge leaks out from the gravity dewatering section, causing an inconvenience.

Therefore, the first object of the present invention is to make the layer thickness of sludge uniform in the width direction of the belt before it is supplied to the squeezing crawler, thereby making the pressure of the belt against the sludge uniform, and also The second purpose is to prevent the belt from meandering and to prevent the generation of sludge.Secondly, the weir plate metal is rotated according to the filtration of the passing sludge, thereby absorbing changes in the sludge supply sludge and preventing sludge leakage, etc.
It is to stop vi.

Embodiments embodying the present invention will be described in detail with reference to the accompanying drawings. Here, FIG. 2 is a perspective view of the gravity dewatering section of a belt press type dewatering device that is an embodiment of the present invention, FIG. 3 is a side view of the buckle plate used in the same device, and FIG. Figure 5 is a side view of the weir plate used in the device, and a front view of the baffle plate. In these figures, the filter cloth belt (1) is inserted between the left and right sludge guides The sludge guides dη and Ua, which travel in the direction of the arrow tll and transport the sludge supplied at the rear to the front, each have four bearing ridges, at+,
@, (c) and J, , 251%1, (7/I is attached, and the shaft is supported by the bearing [phase], and the shaft is rotatably supported on the shaft.) There is a buckle bracket ( C31), 311. C511,G (υnitte 1
145 hek) (11ic vertical m-c, 4 in the width direction of the filter cloth belt where the bottom surface □□□ lightly contacts the fIin belt
Row baffle plates (33a), (33a), (33a),
(33a) is fixed. It is attached to the bracket (to) at an angle θ with respect to the traveling direction Lll of the panfuru-like (33 is the filter cloth belt 11).
In front of these baffle plates (33a), (33aχ..., there are also three rows of buckle plates (33b), (33b), (
33b) is the same as the rear baffle plate (33a), bearing ■
, is fixed to a baffle bracket □□□ fixed to a rotatable shaft supported by the country. Both axes (
), each shaft end of one leg is swingably connected to a horizontal link via a lever I, and the tip of the horizontal link is connected to the sludge guide Uη. Hydraulic actuator that can swing around 1401 (screwed pole)
41J rod (mouth and bottle connection +43) Dff +i self baffle & (33a), (33a')%
-... and (33b), (33b), ... and in front of the baffle plates (33b), (33b), ... are rotatable due to the bearings D1□□□ and Kai. shaft t supported on
aa +, the direction is attached, and each shaft (4 tons (451) has a weir plate (martial) that tilts forward in the same direction as the belt (1) or downward in the forward direction of the belt (1). At the same time, the inner shaft (441) is fixed to the spring plate (4 rows) to the valley 2 that protrudes rearward from the Tsukuda.
Porto screwed onto the spring plate t4L f, 1151
1 is a set bolt whose downward protrusion 'M can be arbitrarily adjusted depending on the tightening position. and the weir plate (m, (forward tilt angle of 4η or shear plate + 4Ei
The force with which l and +4η press down on the sludge layer 0 is adjusted.

Next, the operation of the above embodiment will be examined in more detail.

At s+J of the gravity dewatering section,
5 mud is arrow (lfll) by the progress VC of belt (1)
Baffle 7' racket a
Part 1) of Part 1). At this time, the sludge is removed by a baffle plate (332λ
33a)...The VC leads the lead between the 9 belts shown in Figure 5, and the sludge tK of *E (53a
), (53a)... and one baffle plate (33λ bar (
The sound of 331 houses passed through the door, so the sludge was washed away by the action of this lead, and the sludge came out) UI [is the arrow (to)
The sludge flows down to the exposed part t551 between the sludge layers (53λ) and (Saa), where the surface of the belt Lff is exposed, and passes through the grain of the belt and flows down the road, thus being swept away in a female shape. When the sludge passes through the lower part of the sludge, it is pressed against the weir plate t4b shown in Figure 4 and the sieve-shaped sludge collapses, resulting in a - foot thickness I)). 1m of sludge
(53b), this sludge layer (53b)'' is formed by the following baffle plates (33b), (3ab)...
The exposed N1 Bell II was repeatedly plowed and the sludge was squeezed out.
Furthermore, separation of free water progresses and the water content in the sludge decreases. The sludge thus squeezed into an 8-degree leaf shape is further crushed by the front weir plate u'7), forming a flat sludge layer as shown in Figure 4. 4! I will.

As mentioned above, weir plate +461. T471 is elastically biased to rotate by the spring plates (secondary and fourth), so even if the electricity of the sludge passing through changes, the inclination angle changes accordingly, so that the sludge is dammed up by the light beam. Therefore, the pressing force of 4η is strong enough to flatten the sludge in the width direction, and when the violet of sludge passing over the entire width becomes large, the weir plate The distance between the filter cloth belt and the filter cloth belt increases to the extent that it is strained (Pol) (
5Ul, the protruding tray of (51) must be changed and arranged.

In the above embodiment, the pressing force of the weir plate was applied by the spring plate (441), but as shown in FIG.
(Even if a weight is hung from the lower end of the sprocket (chain wrapped around the circle) fixed to the end of the shaft of 49, a constant rotational force is always applied to the shaft by the tit of this weight) As shown in FIG. 6), the axis t4
4), (A counterweight may be attached to the tip of the lever (b) to apply rotational force.

Note that the number of baffle plates arranged in the belt width direction is not limited to the above number of 61, but may be arranged in one, two or more rows depending on one design condition.

As described above, in the present invention, sludge is sandwiched between two filter cloth belts stretched over the sludge and passed over the outer periphery of the included squeezing roller to remove moisture from the sludge and turn it into a dehydrated cake. In the belt press type dewatering equipment, a weir plate is installed between the filter shoulder and the belt to hold the sludge in the gravity dewatering section, which dewaters the water of the sludge d6 in a manner similar to Jf1. One or more rows are provided in the longitudinal direction of the belt, and the I
Since this is a belt press type dewatering device in which the weir plate can rotate according to t, the thickness of the sludge supplied to the squeezing roller is constant, improving the squeezing force, and causing belt meandering and aging. It has a remarkable effect in preventing accidents such as wet sludge due to fluctuations in the sludge supply, so maintenance monitoring is easy and maintenance-free, and automatic continuous operation is possible. be.

[Brief explanation of the drawing]

Figure 1 is a schematic side view of a conventional belt press type dehydrator;
FIG. 2 is a perspective view of the gravity dewatering section of a belt press type dewatering device which is an embodiment of the present invention, FIG. 3 is a side view of the buckle plate used in the device, and FIG. 4 is the foundation of the device. FIG. 5 is a front view of the baffle plate portion, and FIG. 6 is a schematic field view showing an example of a drive mechanism for the weir plate. (Explanation of symbols) 1.2... Cloth belt, 4.53.53ζ53b・
...Sludge. 6.6'...Gravity dewatering section, 10,11.12.1
3.14... Squeezing row 2.16... Dehydrated cake,
33a, 33b... Buffer A [, 36, 37...
Lever, 38...Horizontal link. 41... Hydraulic actuator, 46.47... Weir plate. 4 & 49...Spring plate, 50.51...Set bolt. 56...Contaminants, etc., 64...Sprocket, 65...
...Chain, 66.68...Weight. Applicant Kobe Steel Co., Ltd.
Patent Attorney Takeyu Honjo ■ Eyes] Figure 5-497- Figure 6 (Q)

Claims (1)

[Claims] 1. A belt press type dewatering device that passes sludge sandwiched between two tensioned filter cloth belts over the outer periphery of multiple squeezing rollers to remove moisture from the sludge and discharge it as a dehydrated cake. In the gravity dehydration section, which dewaters the sludge by its own weight of moisture and gold, there is dirt and N between the filter cloth belt and the gravity dewatering section. I-)
A belt press type dewatering system, characterized in that one or more weir plates sandwiched in the shape of - are provided in the longitudinal direction of the filter cloth belt, and the said weir plates can be rotated according to the violet of sludge passing through. Device.