JPH081389A - Scraper device for screw press - Google Patents

Abstract

PURPOSE:To improve filtration efficiency by forming a scraper of a screw press with an elastic material such as urethane, fitting it into a groove, thereby simplifying its attaching/detaching to/from the spiral blade and continuously preventing the clogging of a screen cylinder without interfering the transporting action of the spiral blade. CONSTITUTION:A cone-shaped feeding shaft wound with a spiral blade 3 around its outer peripheral surface is supported in a screen cylinder 1 in a screw press. A series of grooves 9 are formed along the length direction on the outer peripheral surface of the spiral blade 3, and a cylindrical restraint parts 9a having a diameter larger than the groove width are provided on the groove 9 in fixed intervals. In this series of groove 9 and the restraint parts 9a, a string-shaped scraper 10 made of urethane, etc., corresponding to them is fitted in, and the outer peripheral surface of the scraper is brought into slidable contact with the inner surface of the screen cylinder 1 to rotate the feeding shaft. Consequently, the outer peripheral surface of the scraper 19 is elastically brought into slidable contact with the inner surface of the screen cylinder 1 to carry the cake to be is clogged in the screen cylinder 1 to an exit, thereby enabling an efficient dehydrating operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a screw press scraper device used for dewatering sludge and the like.

[0002]

2. Description of the Related Art It has been well known that a screw press is used to dehydrate sludge and the like. It is also known to provide a scraper on the outer peripheral portion of the spiral blade in order to prevent the cake from clogging due to the adhesion of the cake to the inner surface of the screen cylinder of the screw press.

[0003]

However, the conventional scraper is mounted on the spiral blade by using bolts and the like, which is not only troublesome to attach and detach, but also an obstacle to transporting the cake. There is.

[0004]

The present invention is capable of solving the above-mentioned conventional problems, and the gist thereof is that a spiral blade is wound around the outer peripheral surface in a screen cylinder. In a screw press that supports the feed shaft and narrows the gap between the inner surface of the screen and the outer peripheral surface of the feed shaft from the start end to the end, in the spiral blade wound around the outer peripheral surface of the feed shaft. A series of grooves are engraved along the length direction on the outer peripheral surface, and a cylindrical locking portion having a diameter larger than the groove width is provided at a predetermined interval in the groove and the series of grooves and engagements are provided. An elastic cord-shaped scraper made of urethane or the like having a structure corresponding to these is fitted in the stopper portion, and the outer surface of the fitted scraper is brought into sliding contact with the inner surface of the screen cylinder.

[0005]

Since the device according to the present invention is configured as described above, by rotating the feed shaft, the outer peripheral surface of the scraper elastically comes into sliding contact with the inner surface of the screen cylinder,
The cake that does not get stuck in the screen cylinder can be conveyed toward the outlet for efficient dehydration work. Even when this scraper is attached to the spiral blade, a simple operation of fitting the cord-shaped scraper into the groove and the locking portion of the spiral blade is sufficient. As well as
Since the bulging portion is engaged with the locking portion, it does not shift in the groove and does not hinder the cake transportation.

Further, conventionally, in the screw press, it is necessary to maintain a predetermined clearance between the inner surface of the screen outer cylinder and the outer peripheral surface of the spiral blade at the start end and the terminal end of the screen outer cylinder. However, in the present invention, since the scraper having elasticity is in sliding contact with the inner surface of the screen outer cylinder, high precision processing is not required. Hereinafter, the present invention will be specifically described with reference to the drawings.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic side view of a screw press. Reference numeral 1 is a screen cylinder, 2 is a feed shaft, 3 is a spiral blade wound around the outer peripheral surface of the feed shaft 2, and 4 is a feed shaft 2. Drive motor, 5 undiluted solution tank, 6 undiluted solution supply pump, 7 undiluted solution supply passage, 7 a undiluted solution ejection hole, and 8 a motor for driving the screen cylinder 1. That is, in the screw press of the illustrated example, the screen cylinder is also rotated, and the stock solution is supplied by utilizing the hollow portion of the feed shaft.

Next, the scraper attached to the outer peripheral surface of the above-mentioned spiral blade 2 will be described with reference to FIGS.
FIG. 2 is a plan view of a part of the above-mentioned spiral blade 3, which is denoted by reference numeral 9
Is a groove formed in a series on the outer peripheral surface of the spiral blade 3. The groove 9 is formed in a cylindrical shape at regular intervals and has a locking portion 9
a is formed. The cross-sectional structure of the groove 9 is shown in FIGS. 3 and 4.

FIG. 5 is a perspective view of the scraper 10 fitted in the groove described above. The scraper 10 is made of an elastic material such as urethane in a string-like shape with a thickness fitted in the groove 9 of FIG. Bulging portions 10a corresponding to the locking portions 9a are formed at intervals.

FIG. 7 is a cross-sectional view showing the positional relationship of the scraper 10 constructed as described above with respect to the screen cylinder 1 and the spiral blade 3. When the scraper 10 is fitted in the groove 9, the spiral blade 3 is shown.
It is shown that it protrudes from the outer peripheral surface of and slides on the inner surface of the screen cylinder 1. In addition, the diameter of the bulging portion 10a is equal to that of the groove 9
The depth is almost the same. As an example of the actual size, the spiral blade has a thickness of 9 mm, a groove width of 3 mm, a locking portion diameter of 5 mm, a groove depth of 6 mm, and a pitch at which the locking portions are provided is about 70 mm.

Since the scraper device according to the present invention is constructed as described above, the stock solution is supplied to the screen cylinder 1 and the screen outer cylinder 1 and the feed shaft 2 are driven to rotate, whereby the screen cylinder 1 and the screen cylinder 1 are rotated. It can be filtered by the feed shaft 2 and the filtrate can be taken out of the machine. Then, the cake can be conveyed by the spiral blade 3 and the scraper 10 attached to the spiral blade 3 and taken out of the machine through the opening at the end of the screen cylinder 1.

During this operation, the scraper 10 is brought into sliding contact with the inner surface of the screen cylinder 1, so that it is possible to convey while removing the cake that has been drained of water and clogging the screen outer cylinder with eyes. It is possible to perform efficient filtration operation without clogging.

Further, since the scraper 10 is attached to the outer peripheral surface of the spiral blade 3, it does not hinder the cake conveyance at all, and the scraper 10 is provided in the groove 9 provided in the spiral blade 3. Since the bulging portion 10a is engaged with the locking portion 9a in the longitudinal direction thereof and the outer peripheral surface thereof is restricted by the inner surface of the screen outer cylinder 1, there is no risk of displacement during use. Absent.

Furthermore, in this type of screw press, the clearance between the inner surface of the screen cylinder 1 and the outer peripheral surface of the spiral blade 3 must be made very small. Therefore, the long screen cylinder 1 and the spiral blade 3 must have a small clearance. Although the processing was extremely difficult, the scraper 10 according to the present invention is
Since the outer peripheral surface is elastically slidably contacted, this clearance processing problem is completely solved.

[0015]

As is apparent from the above description, the scraper device according to the present invention can continuously prevent clogging of the screen cylinder of the screw press, improve the filtration efficiency, and improve the spiral blade. It is easy to put on and take off, and it does not hinder the carrying action of the spiral blade,
It is possible to solve the problems of the conventional screw press, such as facilitating the production of the screen outer cylinder and the spiral blade.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of a screw press to which the present invention is applied.

FIG. 2 is a plan view of a part of a spiral blade of the screw press shown in FIG.

3 is a cross-sectional view taken along line XX of FIG.

FIG. 4 is likewise a sectional view taken along the line YY.

FIG. 5 is a partial perspective view of the scraper according to the present invention.

FIG. 6 is likewise a perspective view of a part of the spiral blade.

FIG. 7 is likewise a vertical cross-sectional view showing a part of the scraper for explaining a mounting state of the scraper.

[Explanation of symbols]

 1 Screen cylinder 2 Feed shaft 3 Spiral blade 9 Groove 9a Locking part 10 Scraper

Claims (1)

[Claims] 1. A spiral blade 3 on the outer peripheral surface of a screen cylinder 1.
In the screw press in which the feed shaft 2 wound around the feed shaft 2 is supported and the distance between the inner surface of the screen cylinder 1 and the outer peripheral surface of the feed shaft 2 is narrowed from the start end to the end, the outer peripheral surface of the feed shaft 2 is A series of grooves 9 are engraved on the outer peripheral surface of the spirally wound spiral blade 3 along the length direction thereof, and the groove 9 has a fixed interval and a cylindrical locking portion 9a having a diameter larger than the groove width. In addition, a cord-shaped scraper 10 made of urethane or the like having a structure corresponding to these is fitted in the series of grooves 9 and the locking portions 9a, and the outer peripheral surface of the fitted scraper 10 is A scraper device in a screw press that is brought into sliding contact with the inner surface of the screen cylinder 1.