JPS59218298A - Screw press dehydrator having filter part consisting of multiple plates - Google Patents

Abstract

PURPOSE:To suppress considerably leakage of fine solid content by inserting alternately stationary plates and sliding plates each having a central hole via the holes onto a screw and forming a series of linear grooves so as to enclose said holes. CONSTITUTION:Stationary plates 9a, 9b and sliding plates 10a, 10b respectively having holes 11, 12 are alternately disposed via said holes 11 onto a screw 3 ina screw cylinder 1 and the squeezed water is discharged from the spacings between the same. The plates 9a at both front and rear ends are fixed to the cylinder 1 and the intermediate plates 9b are fixed and supported to the plates 9a before and behind the same by means of supporting shafts 13 penetrating through the four corners thereof. Circular motion is given to the plates, 10a, 10b to slide said plates between the plates 9a and 9b. Two cirrcular linear grooves 14 having the diameter of the concentrical circle different from the diameter of the holes 11, 12 are formed on at least one of the sliding surfaces between the plates 9a, 9b and the plates 10a, 10b. The depth of said grooves is made about 0.1-several mm. and the width about 0.1-several mm..

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a screw screw used for dewatering sludge discharged from sewage treatment plants, various industrial wastewater sludge, etc., or for solid-liquid separation of solid-liquid mixtures generated in the manufacturing process of various industrial products. Regarding press dehydrator. More specifically, a screw is passed through the screw tube, and a large number of fixed plates and sliding plates are placed one on top of the other, and the sliding plate is slid between the fixed plates while draining moisture from the gap between the fixed plate and the sliding plate. This invention relates to a screw press dehydrator having a multi-plate filtration section.

Conventionally, as shown in Japanese Patent Publication No. 50-5819, a screw press dehydrator having a multi-plate filtration section has a fixed plate and a sliding plate having circular holes of the same diameter near the discharge port of the screw cylinder. It is known from various companies that a large number of screws are passed through and arranged alternately, and the sliding plate is tilted back and forth while keeping the centers of the circular holes in the fixed plate and the sliding plate coincident. In addition, as shown in Japanese Patent Publication No. 55-156, there is a fixing plate with a circular hole near the discharge port of the screw cylinder, and an oblong hole with both ends formed by an arc with the same diameter as the circular hole of this fixing plate. A large number of sliding plates with screws are passed through each company alternately, and the length of the sliding plate is There is also known a device in which it is slid back and forth in the long sleeve direction of the circular hole.

A screw press dewatering machine having two multi-plate filtration sections certainly has the advantage of being able to discharge water from the multi-plate filtration section without causing clogging due to sliding of the sliding plates. but,
A workpiece that contains a large amount of fine solids has the disadvantage that the fine solids that have entered between the fixed plate and the sliding plate flow out together with the flowing water, resulting in a large amount of solids leaking out. This leakage of solid content increases the effort for post-treatment of separated water in sludge treatment, and causes wasteful loss of solid content in solid-liquid separation.

The purpose of the present invention is to sufficiently prevent leakage of solid content, and in particular, at least one of the fixed plate and the sliding plate in the sliding contact surface between the fixed plate and the sliding plate of the multi-plate filtration part. A major structural feature is that a series or a plurality of interrupted linear grooves are formed to surround the hole.

By adopting the configuration shown in L, fine solids that try to leak out from the gap between the fixed plate and the sliding plate are caught in the linear grooves on the way, and are accumulated one after another, causing the fixed plate and the sliding plate to leak out. It will fill the gap between. However, between the accumulated fine solids and the fixed plate or sliding plate on the opposite side, a gap is maintained to the extent that water can be discharged by sliding of the sliding plate. The solid content is filtered through the gap, and only moisture flows out, thereby preventing leakage of the solid content.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention. As shown in the figure, inside the screw cylinder l, both ends are provided with bearings 2a,
A screw 3 supported by 2b passes through it. This screw 3 is rotated via a drive gear 4.

On the left side of the screw cylinder 1 in the figure, an input port 5 is provided for charging the material to be processed into the screw cylinder 1. Further, the right end of the screw cylinder l in the figure serves as a discharge port 6 for discharging the cake after dewatering. This discharge port 6 is blocked by a sliding post 8 that is pressed toward the screw cylinder 1 by a spring 7, and the material to be processed is moved by the forward force caused by the rotation of the screw 3 and the sliding post 8 that is pressed against the sliding post 8. The water is compressed and dehydrated by the pressing force of the spring 7. Then, the cake that has been dehydrated is pushed back by the sliding post 8 against the spring 7 due to its forward force, and the discharge port 6 is pushed open, and the squeezed water is squeezed out from the fixed plate 9a, It is discharged from the gap between the sliding plates 9b and the sliding plates 10a and 10b.

Fixed plates 9a, 9b and sliding plates 10a, 1 in this embodiment
0b, both have circular holes 11° and 12, respectively, and as shown in Fig. 2, each company has screws 3 passed through them, and a large number of holes are alternately provided near the discharge port 6 of the screw cylinder l. ing.

The fixing plates 9a at both the front and rear ends are fixed to the screw tube l, and the fixing plate 9b at the middle part has a support shaft 1 passing through its four corners.
3, it is fixedly supported by the front and rear fixed plates 9a. Further, the sliding plates 10a and 1Ob are subjected to circular motion as described later and are slid between the fixed plates 9a and 9b.

The sliding surfaces of the fixed plates 9a and 9b with the sliding plates LO, a and lob are as shown in FIGS. 3(a) and 3(b).

Two circular linear grooves 1 with different diameters concentric with the hole 11
4 is formed. In addition, the sliding surfaces of the sliding plates 10a and 10b with the fixed plates 9a and 9b are also covered with the marks shown in FIG. 4(a) and (
As shown in b), two circular linear grooves 14 having different diameters are formed concentrically with the hole 12.

The linear groove 14 includes fixed plates 9a, 9b, sliding plate 10a,
It plays the role of retaining fine solid matter that is about to leak out together with the water discharged from the gap 10b. Normally, the gap between the fixed plates 9a, 9b and the sliding plates lOa, 10b is as small as 0.1 to 0.3 mm, but in the case of a workpiece containing a large amount of fine solid matter. In this case, a large amount of fine solids leak out from this gap. The linear groove 14 is
The fine solids that enter the gaps between the fixed plates 9a, 9b and the sliding plates 10a, 10b and try to leak out with moisture are caught and grown, and as shown in FIG. 5, they are fixed with the accumulated solids 15. Plates 9a, 9b and sliding plates 10a, 10
Fill the gap between b. This accumulated solid content 1
5, and opposing fixed plates 9a, 9b or sliding plate 10a,
The gap between the sliding plate 10b and the side surface is so small that it does not allow moisture to pass through while the sliding plate 10a and I Ob are at rest, but while the sliding plate 10a and Job are sliding, Allows moisture to pass through. Therefore, as the sliding plate 10a and the fob slide, water flows out as shown by the arrow in FIG. 5, but the solid content is filtered by the accumulated solid content 15 and is prevented from leaking. be.

It is preferable that the linear groove 14 has a depth of 0.1 to several mm and a width of 0.1 to several liters. If the depth is too shallow, it will be difficult to retain the fine solids, and if the depth is too deep, the fine solids will penetrate deep into the linear grooves 14, prolonging the time required for sufficient accumulation and growth. If the width is too wide or too narrow, it will be difficult to retain fine solids.

In the screw press dehydrator having a multi-plate filtration unit according to the present invention, the sliding plates 10a and 10b may be tilted back and forth or moved back and forth linearly from side to side, as in the conventional ones. Alternatively, in order to make the most of the effect of the linear grooves 14, it is optimal to provide circular motion as in the case of this embodiment.

As shown in FIG. 6 and FIG.
6, each is connected in one body. Also, 11
The sliding plates 10a at both rear ends of the sliding plate 10a protrude further laterally on both sides than the sliding plate 10b at the companion portion, and circular cam holes 17 are formed in each of the protruding portions. Inside this cam hole 17 is a circular cam 18 that idles in the cam hole 17.
is loosely inserted, and a rotating shaft 19 to which a cam 18 is eccentrically fixed is supported by bearings 2c and 2d fixed to fixed plates 9a at both front and rear ends, and rotates via an operating gear 20. It has become something that can be done. Therefore, when the rotating shaft 19 rotates and the cam 18 idles in the cam hole 17, the center of the hole 12 of the sliding plates 10a, 10b is located between the cam 18 and the rotating shaft 19. This results in a circular motion that draws a circle whose radius is the length corresponding to the amount of eccentricity.

As mentioned above, the fixed plates 9a, 9b and the sliding plates lOa, ,
The holes 11 and 12 in the sliding plates 10b and 10b are each circular, but as shown in FIG. There is. Then, fixed plates 9a, 9b and sliding plates 10a, 10b
are the outer periphery of the holes 11 of the fixed plates 9a and 9b and the sliding plate 10a,
The center of the hole 11 and the center of the hole 12 are eccentrically provided so that the outer periphery of the hole 12 of the hole 10b touches at one point. This is done so that the two touch at one point. That is, as shown in FIG. 8, the centers x of both holes 11 and 12,
The eccentricity T between x' and the eccentricity T' between the centers Y and Y' of the cam 18 and the rotating shaft 19 are equal.
When rotates, the center X' of the hole 12 becomes a length corresponding to the eccentricity T between the two holes 11 and 12 (same as the eccentricity T' between the cam 18 and the rotating shaft 19) with the center X of the hole 11 as the center. A circular motion is applied to the sliding plates 10a and 10b, as if drawing a circle with a radius of .

In this way, the sliding plates 10a and 1oblf rotate and slide continuously in a certain direction, so when the direction of movement changes, as in the case of reciprocating movement, an impact is applied and the linear grooves The deposited solid content 1 deposited and grown by 14
There is less worry about breaking the 5 and causing it to leak. Further, since the linear groove 14 moves over a wider range than in the case of reciprocating motion, the linear groove 14 can more reliably catch finer solids.

Moreover, the sliding plates 10a, t perform circular motion as described above.

By adding b, the following effects can also be obtained.

As shown in FIG. 8, when the sliding plates 10a, 10b and their holes 12 are in the positions shown by solid lines, the lower ends of the holes 12 are in contact with the lower ends of the holes 11 of the fixed plates 9a, 9b, and the holes 1
The upper end of the hole 11 is located further above the two ends of the hole 11, thereby creating a space 21 above. Further, the cake being pressed by the screw 3 expands and enters this space 21.

Next, when the sliding plates 10a, 10b move circularly as described above, and the sliding plates 10a, 10b and the hole 12 move to the positions loa', 10b', and 12' indicated by broken lines in the figure, the space 21 is , to the right side of the hole 11, 21'. At this time, the cake that had entered the space 21 is pushed back inward with the movement of the sliding plates 10a and 10b, and a new cake enters the space 21' due to the pressing force of the screw 3. Become. Therefore, the cake that is being compressed in the axial direction by the screw 3 is simultaneously repeatedly expanded and pushed back in the circumferential direction, and this vibration action causes moisture in the deep part of the cake to move to the surface. Water separation is promoted and dehydration efficiency is improved. Dewatering is also facilitated by the constant change in the surface of the cake, which tends to separate moisture, as the cake exposes new surfaces into the device by expanding and pushing back.

Especially if you make the cake rise and push back repeatedly like this. Pulsation may occur in the movement of the cake by the screw 3, which may promote the leakage of solids, but if you do the above, the cake will expand and push back continuously over the entire circumference. There is also very little pulsation, and the dewatering efficiency can be improved without promoting the leakage of solids. In order to suppress this pulsation, the sliding plates 10a, 1
It is preferable that the circular motion of 0b is made in synchronization with the rotation of the screw 3 in the same direction.

In the above embodiments, the holes 11 and 12 are circular, but the present invention is not limited to this, and an appropriate shape can be selected according to the sliding movement of the sliding plate 10a and the fob. do it. Further, the linear groove 14 is formed on the fixed plates 9a, 9
b and the sliding plate 10a.

It is not necessary to form it on both sides of 10b, but it is sufficient if it is formed on at least one of them.

9 to 14 each show other aspects of the linear groove 14. In FIG. 9, the linear groove 14 is radially straight with a slight angle, and in FIG. The linear groove 14 has a spiral curve shape.

In FIGS. 11 and 12, the grooves 14 have similar radial and spiral grooves with a slight angle, but each is a set of broken linear grooves 14. In FIG. 13, the short linear grooves 14 are formed randomly, and in FIG. 14, the linear grooves 14 have an irregular annular shape as a whole.

Which of the various linear grooves 14 as described above should be selected may be appropriately selected depending on the type of the object to be treated and the like.

As explained above, according to the present invention, not only can leakage of solid content be significantly suppressed, but even the ones currently in use can be improved with simple processing by forming linear grooves.
It also has some advantages.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view showing an embodiment of a screw press dehydrator having a multi-plate filtration section according to the present invention, Fig. 2 is an enlarged sectional view of the multi-plate filtration section, and Fig. 3 (a) is a fixed Front view of the plate, (b) is a vertical cross-sectional view of the fixed plate, Figure 4 (a) is a front view of the sliding plate, (b) is a vertical cross-sectional view of the sliding plate, and Figure 5 is a linear groove. FIG. 6 is an explanatory diagram of the action and effect of Vl- in FIG.
FIG. 7 is a sectional view taken along the line ■-■ in FIG. 6, FIG.
The figures to FIG. 14 are views showing other embodiments of the linear grooves. 1 varnish screw cylinder, 3 varnish screws 9a, 9b:
Fixed plate, loa, 10b: Sliding plate ll: Fixed plate 9a,
Hole 12 in 9b: Hole 14 in sliding plates 10a and 10b: Linear groove Applicant Sanshu Kaken Kogyo Co., Ltd. Agent Yutaka 1) Yoshio Figure 3 Figure 5 5 Figure 6 Figure 7 Figure 8 Figure 14 Figure 13

Claims (1)

[Claims] Fixing plates and sliding plates with holes are arranged alternately in the screw cylinder by passing screws through each company, and while the sliding plates are sliding between the fixing plates, the screws are inserted through the gap between the fixing plate and the sliding plate. A multi-plate filtration part is used to discharge moisture, and at least one of the fixed plate and the sliding plate is provided with a series or a plurality of interrupted linear grooves surrounding the hole in the sliding contact surface between the fixed plate and the sliding plate. A screw press dehydrator having a multi-plate filtration section.