JP2512684B2 - Screw type dehydrator - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates to construction sludge, bottom sludge,
The present invention relates to a screw type dehydrator for compressing and dehydrating sludge such as sewage, night soil or pulp.

[0002]

2. Description of the Related Art Conventionally, as a dehydrator of this type, the inner cylinder and the outer cylinder, which are concentrically arranged, and an annular space between the inner cylinder and the outer cylinder are provided, and a base end portion is rotated between the inner cylinder and the outer cylinder. A ribbon-shaped screw supported freely is provided, and the substance to be dehydrated introduced into the annular space from an inlet provided on the base end side of the annular space is squeezed and dehydrated by the ribbon-shaped screw, and the squeeze dehydration is performed. There is one in which the dehydrated product is discharged to the outside from a discharge port provided on the tip side of the annular space.

[0003]

SUMMARY OF THE INVENTION In the above conventional configuration,
The base end of the ribbon-shaped screw is only supported by both the inner and outer cylinders, and there is nothing to support the front end, so the front end is elastically deformed by the crushing reaction force and easily contracts toward the base end. It is not possible to sufficiently squeeze the material to be dehydrated. Therefore, it is conceivable to increase the wall thickness of the entire ribbon-shaped screw to prevent elastic deformation. However, this increases the weight, and it is necessary to increase the strength of the dehydrator as a whole and the drive device for the ribbon-shaped screw. As a result, a large size is required, and there is a drawback that the manufacturing cost is high.

In view of the above-mentioned conventional problems, the present invention is a screw in which the tip end side of the ribbon-shaped screw is not contracted to the base end side by a crushing reaction force without increasing the thickness of the entire ribbon-shaped screw. The purpose is to provide a dehydrator.

[0005]

In order to achieve the above object, the present invention provides an inner cylinder and an outer cylinder which are concentrically arranged, and an outer space which is arranged in an annular space between the inner and outer cylinders. A ribbon-shaped screw for transferring the dehydrated object charged into the annular space from the charging port provided on the proximal end side of the cylinder toward the discharge port, and the proximal end side in the annular space is the dehydrated object. Is a squeezing and dehydrating zone for squeezing out water from the drainage screen formed on one or both of the inner and outer cylinders to the outside, and the tip side in the annular space is a plug zone for squeezing the material to be dehydrated in a compressed manner. In the screw type dehydrator, the tip of the ribbon-shaped screw is integrally connected to a rotary shaft that is concentrically inserted into the outer cylinder from the discharge port,
A drive device for rotating and driving the ribbon-shaped screw via the rotation shaft is provided.

[0006]

According to the above construction, the substance to be dehydrated, which has been charged from the charging port into the annular space between the inner and outer cylinders, is transferred toward the discharging port by the ribbon screw, and is compressed and dehydrated in the compression and dehydration zone during the transfer. The water generated by the dehydration is drained to the outside through the drainage screen formed on one or both of the inner and outer cylinders, and the dehydrated material is squeezed in the plug zone during the transfer to a consolidated state. After that, the tip end of the ribbon-shaped screw is integrally connected to the rotary shaft that is concentrically inserted into the outer cylinder from the discharge port. The portion does not contract toward the base end side due to the crushing reaction force, and it is possible to reliably squeeze the material to be dehydrated without increasing the thickness of the ribbon-shaped screw.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a screw type dehydrator which is an embodiment of the present invention, in which an inner cylinder 1 and an outer cylinder 2 and an annular space 3 formed between the inner and outer cylinders 1 and 2 are shown. A ribbon-shaped screw 4 rotatably arranged in the inside, and a ribbon-shaped screw drive device 6 for rotationally driving the ribbon-shaped screw 4.
It has and.

The outer cylinder 2 has an outer cylinder body 2a having a drainage screen 5 consisting of a large number of drainage holes 5a, and an outer cylinder tip portion 2b concentrically connected to the tip of the outer cylinder body 2a.
The base end portion of the outer cylinder body 2a is fixed on the base 8 via the support plate 7. Further, an inlet 9 for the substance to be dehydrated a is formed at the base end of the outer cylinder main body 2a, and the outer cylinder tip 2
A discharge port 10 for discharging the dehydrated product a to the outside is formed at the tip opening of b. The outer cylinder 2
A water receiving tank (not shown) is provided below.

The inner cylinder 1 is composed of a drain screen 12 having a large number of drain holes 12a, and an inner cylinder body 1a arranged concentrically with a slight gap at the tip of the inner cylinder body 1a. It is composed of a cylinder tip portion 1b, and the tip portion of the inner cylinder tip portion 1b is fixed to the base 8 via the support frame 13, and
The base end portion of the inner cylinder body 1a is the base end side end plate 14 of the outer cylinder body 2a.
The inner cylinder 1 is inserted into a through hole formed in the inner cylinder 1.
Are arranged concentrically with the outer cylinder 2. The inner cylinder tip 1b is also provided with a filter.

A squeeze dehydration zone 3a is formed on the base end side of the annular space 3 corresponding to the drainage screens 5 and 12, and the dehydrated material a is compacted corresponding to the outer cylinder tip 2b of the annular space 3. A plug zone 3b for squeezing is formed, and a ribbon-shaped screw 4 is arranged in the squeezing and dehydrating zone 3a.

The ribbon screw driving device 6 will be described. A rotary ring 17 having the same outer diameter as that of the inner cylinder 1 rotates in an annular recess formed between opposed ends of the inner cylinder main body 1a and the inner cylinder tip 1b. A hollow rotary shaft 19 rotatably supported by a bearing 18 fixed to the support frame 13 is pierced through the support frame 13 while being freely arranged. Then, the rotary ring 17 is concentrically inserted into the inner cylinder front end portion 1b, and the rotary ring 17 is integrally fixed to an end plate 20 integrally projecting from the base end portion of the rotary shaft 19. Gear 21 fixed to the part
The pinion 22 meshing with the drive motor (drive device) 23
When the ribbon-shaped screw 4 is rotated in the direction of the arrow in FIG. 2 via the rotary shaft 19, the end plate 20 and the rotary ring 17, the substance to be dehydrated supplied from the charging port 9 into the annular space 3 is rotated. a is transferred to the discharge port 10.

The cone valve 24 slidably fitted on the inner cylinder tip portion 1b is moved back and forth along the inner cylinder tip portion 1b by the cone valve drive cylinder 25, whereby the opening of the discharge port 10 is opened. Is adjusted.

In FIG. 1, reference numeral 26 is rotatably inserted in a hollow rotary shaft 19, its tip end is fixed to a base 8 via a support plate 27, and its base end is via an end plate 28. The inner cylinder main body support shaft integrally fixed to the inner cylinder main body 1a, and 35 are seal portions. The end plates 20 and 28 are provided with holes 29 and 3 for discharging the water in the inner cylinder body 1a to the inner cylinder tip 1b side.
0 is formed.

Reference numeral 31 is a cleaning screw for discharging the drainage in the inner cylinder tip portion 1b into the support frame 13.
It is integrally fixed to the outer peripheral portion of the rotary shaft 19. Reference numeral 32 is a drain port 32 formed in the lower portion of the support frame 13.

Explaining the procedure of squeezing and dehydrating, the substance to be dehydrated a, which has been charged from the charging port 9 into the annular space 3 between the inner and outer cylinders 1 and 2, is transferred toward the discharging port 10 by the ribbon screw 4. The water is squeezed and dehydrated in the squeezing and dehydrating zone 3a on the way, and the water generated by the dehydration is discharged to the outside through the drainage screens 5 and 12 formed in the inner and outer cylinders 1 and 2,
Further, the dehydrated substance a to be dehydrated is squeezed by the cone valve 24 and the ribbon-shaped screw 4 in the plug zone 3b in the middle of transfer to be in a compressed state, and then discharged from the discharge port 10 to the outside.

When the material to be dehydrated a is squeezed as described above, the excessive squeezing reaction force generated thereby is applied to the tip of the ribbon-shaped screw 4, and the tip is supported by the bearing 18 via the rotary shaft 19. Therefore, the tip end of the ribbon-shaped screw 4 does not shrink toward the base end side due to the compression reaction force, and the squeezing of the dehydrated substance a is ensured without increasing the thickness of the ribbon-shaped screw 4. It can be carried out.

4 and 5 show another embodiment of the present invention, in which the rotary shaft 19 and the inner cylinder tip portion 1b are integrated, and the ribbon screw 4 is attached to the inner cylinder tip portion 1b. Since the tip is fixed and the structure is simplified,
Manufacturing costs can be reduced. The configuration other than the above is almost the same as the configuration of the above-described embodiment, and the same portions are denoted by the same reference numerals and the description thereof is omitted.

In both of the above embodiments, the outer tube 2 is a tapered tube, but a straight tube having the same diameter at the base end and the tip may be used. Further, instead of the gear 21 and the pinion 22, a power transmission mechanism including a chain mechanism may be used.
Furthermore, drain screens 5, 12 are provided on both the inner and outer cylinders 1, 2.
However, it may be formed only on one side.

[0019]

According to the present invention, since the tip end of the ribbon-shaped screw is integrally connected to the rotary shaft that is concentrically inserted in the outer cylinder, the tip end is moved toward the base end by the squeezing reaction force. It does not shrink, and it is possible to reliably squeeze the material to be dehydrated without increasing the thickness of the ribbon-shaped screw.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a screw type dehydrator which is an embodiment of the present invention.

FIG. 2 is a view as viewed in the direction of arrows AA in FIG. 1;

FIG. 3 is a view taken in the direction of arrows BB in FIG. 1;

FIG. 4 is a vertical sectional view of a screw type dehydrator which is another embodiment of the present invention.

FIG. 5 is a view taken in the direction of the arrows CC in FIG. 4;

[Explanation of symbols]

 1 Inner Cylinder 2 Outer Cylinder 3 Annular Space 3a Squeeze Dewatering Zone 3b Plug Zone 4 Ribbon Screw 5 Drainage Screen 9 Input Port 10 Discharge Port 12 Drainage Screen 19 Rotating Shaft 23 Drive Motor (Drive Device) a Dehydrated Material

Claims (1)

(57) [Claims] 1. An inner cylinder and an outer cylinder, which are concentrically arranged, and an annular space between the inner and outer cylinders. And a ribbon-shaped screw for transferring the dehydrated substance that has been charged to the discharge port toward the discharge port, and the proximal end side in the annular space squeezes the dehydrated substance to form one or both of the inner and outer cylinders. In the screw type dehydrator, which is a compression dehydration zone for draining water from the drainage screen to the outside, and the tip side in the annular space is a plug zone for compressing the dehydrated material in a compacted manner, in the outer cylinder from the discharge port. The tip of the ribbon-shaped screw is integrally connected to a rotary shaft that is concentrically inserted in
A screw-type dehydrator comprising a drive device for rotationally driving the ribbon-shaped screw via the rotary shaft.