JP2000061500A - Screw type dehydrator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To entirely clean a dehydration screen formed in an inner cylinder. SOLUTION: This dehydrator is provided with: an inner cylinder 1 and an outer cylinder 2, placed concentrically with each other; a dehydration screw 4 placed in an annular space 3 between the inner and outer cylinders 1 and 2; and a cleaning screw 5 placed inside the inner cylinder 1. In the dehydrator, by rotationally driving the dehydration screw 4, a material M to be dehydrated, which is charged from a charge port 12 placed on the side of the rear end of the outer cylinder 2 into the annular space 3, is subjected to pressure dehydration and water separated from the material M by the pressure dehydration is discharged to the outside of the dehydrator through dehydration screens 8 and 9 formed in the bodies of the inner and outer cylinders 1 and 2 respectively and also, the dehydrated material M is discharged to the outside through a discharge port 13 placed on the side of the front end of the outer cylinder 2. Further, the dehydrator is provided with a driving motor 36 for rotationally driving the inner cylinder 1 through a gear section 24 and a pinion 35.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a screw type dehydrator for squeezing and dehydrating sludge such as sewage, night soil or industrial waste.

[0002]

2. Description of the Related Art Conventionally, an example of this type of screw type dehydrator is shown in FIGS. This is an inner cylinder 1 and an outer cylinder 2 arranged concentrically, and both inner and outer cylinders 1, 1.
A dehydration screw 4 arranged in the annular space 3 between the two;
It has a cleaning screw 5 arranged in the inner cylinder 1.

The inner cylinder 1 has its base end portion inserted into a through hole penetrating the base end side end plate 2a of the outer cylinder 2, and its tip end portion mounted on a base 7 via a support girder 6. By being fixed, the dehydration screen 8 is horizontally arranged and has a large number of dehydration holes 8a from the base end to the vicinity of the front end in the outer cylinder 2.

The outer cylinder 2 is integrally and concentrically connected to the outer cylinder body 2A having a dehydration screen 9 composed of a large number of dehydration holes 9a, and a support girder 10 at the tip of the outer cylinder body 2A. A support girder 11 having an outer cylinder tip portion 2B and supporting the base girder of the support girder 10 and the outer cylinder body 2A is fixed to the base 7. In addition, an inlet 12 for introducing the substance to be dehydrated M is provided on the base end side of the outer cylinder body 2A, and a discharge for discharging the dehydrated substance M to be dehydrated is provided at the tip opening of the outer cylinder tip 2B. An outlet 13 is formed.

The dewatering screw 4 is in the form of a ribbon without a shaft and has a rotating ring 16 rotatably disposed between the outer cylinder body 2A and the outer cylinder tip portion 2B via a seal material 14 and a bearing 15. A pinion 18 is meshed with a gear portion 17 fixed to the inner peripheral surface and protrudingly provided on the outer peripheral surface of the rotary ring 16, and a drive motor 19 for rotationally driving the pinion 18 is provided.

In the cleaning screw 5, both ends of the shaft portion 5a are fixed to the both ends of the inner cylinder 1, and the bearing 2 is attached to the bracket 21.
A pinion 24 is meshed with a gear 23 fixed to one end of the pinion 24 while being rotatably supported through the drive motor 25.

In FIG. 5, reference numeral 26 is a cone valve slidably fitted on the tip of the inner cylinder 1 and is moved back and forth by a jack 27 so that the opening of the discharge port 13 can be adjusted. It has become.

Explaining the procedure of squeezing and dewatering, by rotating the dewatering screw 4 via the pinion 18 and the gear portion 17 by the drive motor 19, the inside of the annular space 3 between the inlet 12 and the inner and outer cylinders 1 and 2 is rotated. The substance to be dehydrated M
Is squeezed and dehydrated, and the water produced by the dehydration is drained to the outside through the dehydration screens 8 and 9, and the dehydrated material M to be dehydrated is discharged from the outlet 13, and the drive motor 25 causes the pinion 24 and By rotating the cleaning screw 5 via the gear 23, the inner surface of the dehydration screen 8 is cleaned to prevent clogging, and the dehydrated matter M that has entered the inner cylinder 1 is scraped to the outside.

[0009]

SUMMARY OF THE INVENTION In the above conventional configuration,
The cleaning screw 5 is rotated to clean the inner surface of the dehydration screen 8 formed on the inner cylinder 1 to prevent clogging. However, since the inner cylinder 1 is fixed, the cleaning screw 5 has its own weight. When the cleaning screw 5 is used, the cleaning screw 5 cleans only a certain range α of the lower portion of the dewatering screen 8, and the other portions are insufficiently cleaned, and the dewatering hole 8a is clogged with the material to be dewatered M. Is reduced.

In view of the above problems, it is an object of the present invention to provide a screw type dehydrator capable of cleaning the entire dehydrating screen formed on the inner cylinder.

[0011]

In order to achieve the above object, the present invention provides an inner cylinder and an outer cylinder which are concentrically arranged, and a dewatering screw which is arranged in an annular space between the inner and outer cylinders. And a cleaning screw disposed in the inner cylinder,
By rotationally driving the dehydration screw, the dehydrated substance charged into the annular space is squeezed and dehydrated from the charging port provided on the proximal end side of the outer cylinder, and the dehydrated water is formed in both the inner and outer cylinders. In the screw type dehydrator configured to discharge the dehydrated material to the outside through the discharge port provided on the tip side of the outer cylinder, while draining the water to the outside through the dehydrating screen. It is characterized in that an inner cylinder drive device for rotationally driving is provided.

According to the above structure, since the inner cylinder is rotated, the portion of the dehydration screen formed on the inner cylinder, which is cleaned by the cleaning screw, is entirely covered with the rotation of the inner cylinder. It can be spread and the entire dehydration screen can be cleaned.

Further, by rotating the inner cylinder in the direction opposite to the rotation direction of the dehydration screw, the substance to be dehydrated introduced into the annular space between the inner and outer cylinders does not rotate integrally with the inner cylinder. It is possible to efficiently squeeze and dehydrate the material to be dehydrated.

A second aspect of the invention is characterized in that, in the first aspect of the invention, a cleaning screw drive device for rotationally driving the cleaning screw is provided.

According to the above construction, by rotating the cleaning screw at the same time as rotating the inner cylinder, the dehydration screen formed on the inner cylinder can be cleaned more efficiently and in a shorter time.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a screw-type dehydrator according to an embodiment of the present invention, which differs from the conventional example shown in FIGS. 5 and 6 in the following points. That is, the inner cylinder 1
Of the fixed frame 3 whose base end portion is provided on the base end plate 2a of the outer cylinder 2
No. 0 is rotatably supported via a bearing 31, and the tip of the inner cylinder 1 is rotatably supported via a bearing 33 on a support frame 32 projecting from the support girder 10. Further, a pinion 35 is meshed with a gear portion 34 fixed to the base end portion of the inner cylinder 1, and a drive motor (inner cylinder drive device) 36 that rotationally drives the pinion 35 is provided on the fixed frame 30. In addition, 37 is a draining board and 38 is a sealing material.

The base end of the cleaning screw 5 is the base 7.
A frame body 40 supported by a supporting girder 39 protruding from the supporting frame 32 and having the tip of the cleaning screw 5 protruding from the supporting frame 32.
Supported by.

As shown in FIGS. 1 and 4, a split yoke 42 is fitted onto the annular groove 26a of the cone valve 26, and both ends of a pair of arcuate frames 42a forming the yoke 42 are bolted. The fasteners 43 are integrally connected by nuts, and the jacks 27 are interposed between the bolts of the fasteners 43 and the support girder 10. In addition,
Reference numeral 45 is a belt conveyor for receiving the material to be dehydrated M discharged from the discharge port 13 and conveying it to a predetermined position, 46 is a water collecting tank with a drain hole 46a provided in the base 7, and 47 is a supply port 12. It is a dehydration hole penetrating the side wall. In the configuration other than the above, the same parts as those in the conventional example shown in FIGS. 5 and 6 are designated by the same reference numerals, and the description thereof will be omitted.

In the above structure, the dehydration screw 4 is driven by the drive motor 19 via the pinion 18 and the gear portion 17.
By rotating the
The to-be-dehydrated substance M put into the annular space 3 between the two is squeezed and dehydrated, and the water generated by the dehydration is dehydrated by the dehydration screens 8 and 9.
To be drained to the outside through the
Is discharged from the discharge port 13.

At the same time, by rotating the inner cylinder 1 by the drive motor 36 via the pinion 35 and the gear portion 34, the dehydration screen 8 formed on the inner cylinder 1
The lower part of the dehydration screen is cleaned by the cleaning screw 5 by a certain range α, but since the cleaned portion spreads over the entire dehydration screen 8 as the inner cylinder 1 rotates, the entire dehydration screen 8 can be cleaned. Can, its dehydration screen 8
The dehydrated substance M does not become clogged in the dehydration hole 8a of
It can be dehydrated efficiently.

Further, as shown in FIG. 3, by rotating the inner cylinder 1 in the direction b opposite to the rotation direction a of the dehydration screw 4, the water to be dehydrated introduced into the annular space 3 between the inner and outer cylinders 1 and 2. The product M does not rotate integrally with the inner cylinder 1, and the product M to be dehydrated can be efficiently compressed and dehydrated.

In the above embodiment, the cleaning screw 5
Was fixed so that it could not be rotated.
The cleaning screw 5 may be rotated by the drive motor (cleaning screw driving device) 25 via the pinion 24 and the gear 23 (another embodiment).

According to the above construction, by rotating the cleaning screw 5 at the same time as rotating the inner cylinder 1, the dehydration screen 8 formed on the inner cylinder 1 can be cleaned more efficiently and in a shorter time.

A cleaning water supply passage is formed in the shaft portion 5a of the cleaning screw 5, and a large number of ejection holes communicating with the cleaning water supply passage are formed on the surface of the shaft portion 5a. You may make it wash | clean the dehydration screen 8 by spraying wash water.

Further, as shown in FIG. 1, in order to improve the squeezing and dewatering efficiency of the material to be dehydrated M, the inner cylinder 1 is formed in a straight cylindrical shape having the same diameter in all parts, and the outer cylinder 2 is tapered. However, conversely, the inner cylinder 1 may be formed in a tapered shape with a divergent shape, and the outer cylinder 2 may be formed in a straight cylindrical shape having the same diameter in any part.

[0026]

According to the first aspect of the present invention, since the inner cylinder is adapted to rotate, the portion of the dehydration screen formed on the inner cylinder that is cleaned by the cleaning screw is accompanied by the rotation of the inner cylinder. Thus, the entire dehydrating screen can be cleaned by spreading over the entire dehydrating screen.

By rotating the inner cylinder in the direction opposite to the rotation direction of the dehydration screw, the substance to be dehydrated introduced into the annular space between the inner and outer cylinders does not rotate integrally with the inner cylinder. It is possible to efficiently squeeze and dehydrate the material to be dehydrated.

According to the second aspect of the present invention, the dewatering screen formed on the inner cylinder can be cleaned more efficiently and in a shorter time by rotating the cleaning screw while rotating the inner cylinder.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a screw dehydrator according to an embodiment of the present invention.

FIG. 2 is a cutaway plan view of the same portion.

FIG. 3 is a view on arrow AA of FIG.

FIG. 4 is a view taken along the line BB of FIG.

FIG. 5 is a vertical sectional view showing a conventional example.

FIG. 6 is a view on arrow CC of FIG.

[Explanation of symbols]

1 inner cylinder 2 outer cylinder 3 annular space 4 dehydration screw 5 cleaning screw 8 dehydration screen 9 Dehydration screen 12 slot 13 outlet 25 Drive motor (cleaning screw drive) 36 Drive motor (inner cylinder drive) M to be dehydrated

Claims (2)

[Claims] 1. An inner cylinder and an outer cylinder arranged concentrically, a dehydration screw arranged in an annular space between the inner and outer cylinders, and a cleaning screw arranged in the inner cylinder. Have,
By rotationally driving the dehydration screw, the dehydrated substance introduced into the annular space from the inlet provided on the base end side of the outer cylinder is squeezed and dehydrated, and the dehydrated water is formed in the inner and outer cylinders. In the screw type dehydrator configured to discharge the dehydrated material to the outside through the discharge port provided on the tip side of the outer cylinder, while draining the water to the outside through the dehydrating screen. A screw type dehydrator, which is provided with an inner cylinder drive device for rotationally driving. 2. The screw type dehydrator according to claim 1, further comprising a cleaning screw driving device for rotationally driving the cleaning screw.