JPH066239B2 - Dehydrator - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a dehydrator, and more particularly to a dehydrator that pressurizes a sludge such as sewage sludge to separate solid-liquid.

(Prior Art) An apparatus for interposing a filter cloth inside a pair of pressure bands provided in an endless belt and putting a mud in between the filter cloths to depressurize under pressure has been conventionally developed. Among the devices, a dehydrator of the type in which a pressure band is arranged on the outer circumference of a rotary drum is known.

As an example of the conventional technique, there is an apparatus described in Japanese Patent Publication No. 52-33824.

In the dehydrator according to the above-mentioned conventional technology, since the area for pressure dehydration is formed along the peripheral surface of the drum, it is an advantage that the entire device is compact, and is widely used as a dehydrator for sewage sludge including public organizations. Used in

FIG. 6 shows a drum type dehydrator according to the prior art,
Due to the fact that a pressing area is formed on the peripheral surface of the drum 1 and that the cake cannot be taken out above the drum, both the loading position 2 and the cake unloading position 3 of the object to be processed are horizontal to the drum. The position is. The squeezed area is an area in which the pressure roller 5 is arranged on the back surface of the pressure belt 4, but if this squeezed area is divided into four equal parts, the best dehydration is performed in the area A, and B, Further dewatering takes place in section C and final pressure dewatering takes place in section D.

In this conventional technique, since the area A where the initial dehydration is performed is located on the side of the drum, a part of the filtrate separated from the material to be processed enters the area B, which impedes the dehydration efficiency in the area B. There is a problem. Further, the D section is also located on the side of the drum, and the dewatering operation is also performed in the D section to separate the filtrate, but the dewatering is performed as the final finish after the dewatering in the C section. Therefore, it can be said that the filtrate separated from the D section is small and therefore the dewatering effect in the C section is not adversely affected.

In order to solve the above problem, it is sufficient to enlarge the drum and form the squeezing area substantially long, but this makes the dewatering device large, limits the installation location, and further increases the manufacturing price and is uneconomical. It causes problems such as

(Problems to be Solved by the Invention) The present invention has been made in order to solve the problems of the prior art, and it is an object of the present invention to provide a dehydrator that does not use a drum while taking in the advantages of the conventional drum type dehydrator. To do.

(Means for Solving the Problem) Means for solving the problem in the present invention include a frame in which two steel plates are appropriately separated from each other, and a side surface half that faces upward from below a vertical line in an inner portion of the frame. An inner roller group arranged in a circular shape with no gaps, an outer roller group arranged on the outer side of the inner roller group along the semicircle of the inner roller group without a gap, and a squeezing member having a narrow width. A plurality of endless belt chains are attached to both sides of the plate, and the chains are mounted on the drive sprocket and the driven sprocket mounted on the frame and between the inner and outer roller groups. A pair of pressure bands, a water-permeable filter cloth attached to the inside of each pressure band, a squeezing device for adjusting a mounting interval between the outer roller group and the inner roller group, and the drive sprocket. To drive The pair of pressure bands have a lower part of the inner and outer roller groups as an inlet of the object to be treated, an upper part thereof as a cake outlet, and a pair of pressure belts from the inlet to the outlet. It is characterized in that the interval between the pressure bands is gradually narrowed.

(Operation) When the object to be processed is supplied to the charging port 23, the object to be processed is sandwiched between the pressure bands 25 and 26 to move, and these pressure bands 2
Pressure is applied between 5 and 26 to separate solid and liquid, and the cake is taken out at the take-out port 24. Since the outlet 24 is provided above the vertical line, the filtrate does not enter the pressed cake and the dewatering effect is improved.

The pressing bands 25 and 26 are narrow pressing plates 27 and 28 which are the chains 2.
9 and 30 are continuously arranged in parallel, and are pressed by rollers from the back surface, so that the pressing plates 25 and 26 move to sway the pressing plates 27 and 28 independently, and to the object to be processed. Local pressure is applied to improve the dehydration effect.

(Embodiment) In FIGS. 1 and 2, a frame 10 is provided with two steel plates appropriately separated from each other, and has a semicircular shape in which an inner portion of the frame 10 is directed upward from below a vertical line 11. A plurality of arranged inner support shafts 12 are provided. Further, the inner support shaft 12 is provided with two roller receiving plates 13 each having an outer edge formed in an arc shape, and a plurality of inner rollers 14 are arranged in the roller receiving plate 13 in a semicircular shape without a gap. It constitutes an inner roller group.

On the outer side of the inner roller group, a plurality of outer support shafts 15 which can be attached to and detached from the frame 10 are provided corresponding to the inner support shafts 12, and the outer support shafts 15 have two inner edges having an arc shape. The mounting frame 16 is provided. Then, a plurality of outer rollers 17 arranged in a semicircular shape corresponding to the inner roller 14 without a gap are arranged on the mounting frame 16 to form an outer roller group, and the inner roller 14 and the outer roller 17 squeeze. The area is formed. 1
Reference numeral 8 denotes a reinforcing shaft mounted on the pressing plate 16 behind the outer roller 17.

In FIG. 3, the outer support shaft 15 is a frame 10
The outer support shaft 1 provided on the lower bearing fitting 19 is provided with adjustable mounting positions on the bearing fittings 19 and 20 provided on
5 is fixed by a set screw 21, and the outer support shaft 15 provided on the side and upper bearing fittings 20 is a fluid cylinder device 2.
It is connected to the second piston rod, and the mounting frame 16 moves toward the inner roller 14 by the operation of the cylinder device 22, whereby the squeezing work is performed between the outer roller 17 and the inner roller 14. The outer roller 1
As for the distance between the outer roller group formed by 7 and the inner roller group formed by the inner roller 14, the workpiece inlet 23 formed below the roller group is wide, and the gap is gradually narrowed toward the upper side, and the cake outlet 24 is formed. Are arranged so as to be the narrowest.

A pair of pressure bands 25 and 26 are mounted between the two roller groups. Each of the pair of pressurizing bands 25 and 26 is formed by endless belts in which a plurality of narrow pressing plates 27 and 28 are continuously fixed to chains 29 and 30.
9 and 30 are mounted between the drive sprockets 31 and 32 which are mounted on the frame 10 and which are connected to the rotary drive device, and the driven sprockets 33 and 34.

In FIG. 2, the pressure belt 25 that rotates while being in contact with the inner roller 14 moves while the chain 29 is guided by a guide 35 provided inside the frame 10, and the outer roller 17 also moves.
The pressurizing band 26 in contact with the outer supporting shaft 15 and the reinforcing shaft 1
A guide 36 provided on the No. 8 guides the movement.

Further, in FIGS. 4 and 5, the compression plates 27 and 28 are formed such that the cross-sectional shape of the compression plate 27 forming the arc of the inner portion in the compression area is a curved surface having a high center (FIG. 4B). The cross-sectional shape of the squeeze plate 28 forming the outer arc is formed into a curved surface having a lower center (FIG. 5B). Further, the pressing plates 27 and 28 are provided with through holes 27a and 28a for discharging the dehydrated filtrate.

The pressure bands 25, 26 have recesses 27b formed in the vicinity of both ends of the pressing plate 27 of the pressure band 25 so that the rollers can be approached with each other with a narrowed space. The chain 30 of the pressure band 26 and the guide 36 are fitted together (FIG. 2).

In addition, in FIG. 2, filter cloths 37 and 38 are superposed on the insides of the pressure bands 25 and 26. The filter cloths 37 and 38 are usually made of cloth, but other materials can be used as long as they can pass water. Further, in FIG. 1, 39 is a water receiver for collecting the dehydrated filter cake, and 40 is a filter cloth cleaning device.

The embodiment has the above-mentioned structure, and when the drive sprockets 31 and 32 are rotated by the rotary drive device, the pressure belt 25,
26 is rotated counterclockwise in FIG. 1 between the inner roller 14 and the outer roller 17 which are the squeezing areas. When the fluid cylinder device 22 is operated toward the center of the arc, the mounting frame 16 and the outer roller 17 press the inside, that is, the inner roller 14.

The object to be processed is supplied to the input port 23. The supplied object to be processed is sandwiched between the pressure belts 25 and 26 and moves together with the pressure belts 25 and 26, and the interval between the inner roller 14 and the outer roller 17 is gradually narrowed. . Then, the object to be processed moves along the inner roller 14 by about 180 °, and when the object to be processed reaches the take-out port 24, the object to be processed is dehydrated and taken out as a cake at the position.

When the object to be processed is dewatered under pressure, the pressing plates 27, 28 are pressed from the back by the inner and outer rollers 14, 17, but the pressing plates 27, 28 are attached to the chains 29, 30 one by one. Since the squeezing plates 27 and 28 move independently while oscillating (in a wavy state), a local force is applied to the object to be processed, and effective dehydration is performed.

The mounting frame 16 mounted on the outer roller 17 is provided on the outer support shaft 15, and the outer support shaft 15 can be detached from the frame 10. 17 can be removed from the frame 10.

(Effect of the invention) The present invention is one in which a pair of pressurizing bands are arranged in a semicircular shape that extends upward from below a vertical line to form a squeezed area, and the upper side of the squeezed area is open. Since the cake can be taken out above the vertical line, the filtrate separated by dehydration is immediately discharged, and the dehydrated filtrate does not re-enter the object to be treated, and the dehydration efficiency is improved. effective.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of the whole of the dehydrator of the present invention assembled, FIG. 2 is a sectional view of a pressurizing portion, FIG. 3 is a side view of the whole, and FIG. 4 constitutes an inner pressurizing band. A pressing plate, A is a plan view, B is a sectional view, FIG. 5 is a pressing plate constituting an outer pressurizing band, A is a plan view, B is a sectional view, and FIG. 6 is a conventional dehydrator. Side view. 10 ... Frame 11 ... Vertical line 12 ... Inner support shaft 13 ... Roller receiving plate 14 ... Inner roller 15 ... Outer support shaft 16 ... Mounting frame 17 ... Outer roller 18 ... Reinforcing shaft 19, 20 ... Bearing metal fitting 21 ... Set screw 22 ... Fluid cylinder device 23 ... Input port 24 ... Outlet port 25, 26 ... Pressurizing band 27, 28 ... Compressing plate 29, 30 ... Chain 31, 32 ... Drive sprocket 33, 34 ... Followed sprocket 35, 36 ... Guide 37, 38 ... Filter cloth 39 ... Water receiver 40 ... Cleaning device

Claims (1)

[Claims] 1. A frame provided with two steel plates appropriately separated from each other, an inner roller group arranged in the inner part of the frame in a semicircular shape of a side face facing upward from below a vertical line without a gap, and the inner side. The outer roller group, which is arranged on the outer side of the roller group along the semicircle of the inner roller group without a gap, and the both sides of the compressed plate formed with a narrow width, are continuously connected to the endless belt chain. Mounting, a pair of pressure bands mounted on the drive sprocket and the driven sprocket mounted on the frame and mounted between the inner and outer roller groups, and mounted inside each of the pressure bands. A water-permeable filter cloth, a squeezing device for adjusting the mounting distance between the outer roller group and the inner roller group, and a rotary drive device for rotationally driving the drive sprocket. The pressure band is inside And the lower part of the outer roller group is the inlet for the object to be treated, and the upper part is the cake outlet.
Moreover, the dehydration apparatus is characterized in that the interval of the pressure band is gradually narrowed from the input port toward the extraction port.