JPH08141789A - Screw type dehydrator - Google Patents

Abstract

PURPOSE: To surely compress an object to be dehydrated by retaining the tip end of a ribbon type screw freely rotatably on an outer cylinder through an annular member and thereby preventing the elastic deformation of the tip end side of the ribbon type screw. CONSTITUTION: A ribbon type screw 7 for driving a driving motor 25 is rotated around the shaft center while being retained by a retaining device 30 at the tip end of the screw, and an object 11 to be dehydrated is thrown in from a feeding port 12 provided in an outer cylinder 5 to an annular space 10 between the outer cylinder 5 and an inner cylinder 4. The object 11 so thrown in is moved toward a discharge port 15 through the rotation of the ribbon type screw 7, compressed and dehydrated in a compression dehydrating zone A, with the water discharged from the discharging screen 6, 13 of the inner 4 and the outer cylinder 5, and with the dehydrated object 11 discharged from the discharge port 15. At this time, the tip end of the ribbon type screw is retained by an annular member 33 supported with a bearing 31 attached to the outer circumference of the outer cylinder 5; consequently, the ribbon type screw 7 is prevented from contracting to the base end side, enabling the compression to be surely performed for the object 11 to be dehydrated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw type dehydrator for squeezing and dewatering sludge such as sediment sludge (sludge) construction sludge, sewage, night soil or pulp.

[0002]

2. Description of the Related Art Conventionally, a dehydrator of this type has been provided in an annular space between an inner cylinder and an outer cylinder, which are concentrically arranged, and an inner cylinder and an outer cylinder, and a base end portion or a distal end side thereof is rotated between the inner cylinder and the outer cylinder. A ribbon-shaped screw that is freely supported is provided, and the substance to be dehydrated introduced into the annular space from the inlet provided on the proximal end side of the annular space is squeezed and dehydrated with the ribbon-shaped screw and provided on both the inner and outer cylinders. There is a drainage screen that drains water to the outside and squeezes and dehydrates the substance to be dehydrated to the outside through a discharge port provided on the tip side of the annular space.

[0003]

SUMMARY OF THE INVENTION In the above conventional configuration,
The ribbon-shaped screw is supported by both the inner and outer cylinders at the base end or the tip side of the ribbon-shaped screw, and when the ribbon-shaped screw becomes large or when the diameter of the ribbon-shaped screw is increased, the ribbon-shaped screw is supported by elastic deformation. There is a case in which the product to be dehydrated cannot be squeezed sufficiently because it is easily shrunk outside the area.

Therefore, it is conceivable to increase the wall thickness of the entire ribbon-shaped screw to prevent elastic deformation. However, this causes a large weight, and it is necessary to increase the strength of the dehydrator as a whole and the ribbon-shaped screw is also increased. However, there is a problem in that a large-sized drive device is required and the manufacturing cost is high.

When the ribbon-shaped screw has a large diameter,
There is a problem that it is difficult to manufacture and transport. The present invention
In view of the above-mentioned conventional problems, a screw type dehydrator capable of preventing the ribbon-shaped screw from shrinking due to a compression reaction force and increasing the diameter without increasing the thickness of the entire ribbon-shaped screw is provided. Is intended.

[0006]

Means for solving the problems in the present invention is to provide 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-like screw that transfers the substance to be dehydrated introduced into the annular space from the input port provided on the proximal end side of the cylinder toward the discharge port provided on the distal end side of the outer cylinder, and squeezes the dehydrated product In a screw type dehydrator that drains water to the outside from a drainage screen formed in one or both of the inner and outer cylinders, the screw dehydrator is disposed at least on the outlet side and rotatably supported by the outer cylinder via a bearing. An annular member fitted to the ribbon-shaped screw is provided.

[0007]

In the above means for solving the problem, the substance to be dehydrated, which has been charged into the annular space between the outer cylinder and the inner cylinder from the charging port, is dehydrated in the squeezing dehydration zone by the rotation of the ribbon-shaped screw, and the base end side From the discharge port provided in the outer cylinder, the tip of the ribbon-shaped screw is prevented from bending by the annular member at this time, and the ribbon-shaped screw is ribbon-shaped. Even if the screw has a large size or a large diameter, the product to be dehydrated is reliably squeezed.

[0008]

Embodiments of the screw type dehydrator of the present invention will be described below with reference to the drawings. First, a first embodiment of the present invention will be described based on the overall configuration diagram of FIG. 1. This is to squeeze and dehydrate sludge such as sediment sludge (construction sludge), construction sludge, sewage, night soil or pulp. Then, the outer cylinder 5 is supported by the support plates 2A and 2B that are erected on the base 1, and the inner cylinder 4 is supported by the support plates 3A and 3B that are erected on the other side of the base 1. 5 is concentric, the outer cylinder 5 is formed to be shorter than the inner cylinder 4, and a ribbon-shaped screw 7 is arranged in an annular space 10 formed between both cylinders 4, 5.

An article to be dehydrated 11 is provided on the upper surface side of the base end of the outer cylinder 5.
Is formed into a drainage screen 13 having a large number of drainage holes 5a on its peripheral surface, and a discharge port for discharging the dehydrated article 11 to the outside is provided at the tip opening. 15 is formed.

The inner cylinder 4 is formed as a drainage screen 6 having a large number of drainage holes 4a on its peripheral surface, and the diameter of the base end portion of the inner cylinder 4 is increased as it approaches the tip end portion. ing.

A rotation supporting device 20 is provided for rotatably supporting the ribbon-shaped screw 7 on the base end side thereof, and the rotation supporting device 20 is a pair of first attachments attached to the outer peripheral base end of the outer cylinder 5. An annular member 28 that is mounted between the bearings 21 and 22 and is rotatably supported by the first bearings 21 and 22 and that is fitted to a part of the outer periphery of the base end portion of the ribbon-shaped screw 7, and an outer member of the annular member 28. It is composed of a ring gear 23 fitted and attached, and a drive motor 25 having a drive pinion 24 that meshes with the ring gear 23 and rotates, and the annular member 28 is formed to have a diameter slightly larger than that of the outer cylinder 5. The ring gear 23 and the drive pinion 24
Is covered by a cover 26 provided on a bearing support member 27 arranged along the outer circumferences of the first bearings 21 and 22.

A supporting device 30 for supporting the tip of the ribbon-shaped screw 7 is provided, and the supporting device 30 is provided.
Is a set of second bearings 3 attached to the outer peripheral tip of the outer cylinder 5.
1, a seal 32, and an annular member 33 that is mounted between the second bearings 31 and is rotatably supported, and that is fitted to a part of the outer periphery of the tip end portion of the ribbon-shaped screw 7, the annular member 33. The outer peripheral portion of the second bearing 31
It is covered by a cover 34 mounted in between.

With the annular member 33 of the supporting device 30 as a boundary, the base end side of the annular member 33 serves as a squeeze dehydration zone A for dehydrating the water in the dehydrated material 11, and the distal end side of the annular member 33 dehydrates after dehydration. It is a plug zone B in which the object 11 is retained to form resistance and is further squeezed. In this plug zone B, there is no blade of the ribbon-shaped screw 7, and the substance to be dehydrated 11 remains.

Reference numeral 35 in the drawing denotes a cone valve slidably fitted on the tip of the inner cylinder 4, which can be moved back and forth along the inner cylinder 4 by a drive cylinder device (not shown). Therefore, the opening degree of the discharge port 15 can be adjusted.

Explaining the procedure of squeezing and dehydrating in the above structure, first, when the drive motor 25 is driven, the drive force is transmitted from the drive pinion 24 to the ring gear 23 and the annular member 28, and the ribbon-shaped screw 7 at its tip. It rotates around the axis while being supported by the support device 30.

When the substance to be dehydrated 11 is charged into the annular space 10 from the charging port 12 in this state, the substance to be dehydrated 11 is transferred toward the discharge port 15 by the rotation of the ribbon-shaped screw 7, and the compression dehydration zone A in the middle thereof. The water that is squeezed and dehydrated by the water is discharged to the outside through the drainage screens 6 and 13 formed in the inner cylinder 4 and the outer cylinder 5, respectively. Is squeezed by the cone valve 35 and the tip of the ribbon-shaped screw 7 in the plug zone B on the way of transfer, and is compressed to be discharged to the outside from the discharge port 15.

When the article to be dehydrated 11 is squeezed as described above, a large squeezing reaction force generated thereby acts on the tip end of the ribbon-shaped screw 7, but the ribbon-shaped screw 7
Since the tip end portion of is supported by the annular member 33 supported by the second bearing 31 attached to the outer periphery of the outer cylinder 5,
Even if the compression reaction force acts on the tip of the ribbon-shaped screw 7,
The annular member 33 is prevented from moving toward the base end side by the second bearing 31, whereby the ribbon-shaped screw 7 can be prevented from contracting toward the base end side (bending in the axial direction), and the dehydrated object 11 is squeezed. Can be reliably performed.

Next, a second embodiment of the present invention will be described with reference to FIG. 2, in which the rotary support device 20 in the first embodiment is provided on the plug zone B side, and the support device 30 is provided.
Is provided in the middle of the squeezing and dehydrating zone A, and the front end of the inner cylinder 4 is rotatably supported by a supporting member 41 that is attached to the opening surface of the front end of the outer cylinder 5 via a bolt 40 and hangs down. The opening of the front end of the article is used as the input port 12 for the article to be dehydrated 11, and the transfer device 4 for transferring the article 11 to be dehydrated to the input port 12.
2 is connected.

The transfer device 42 has a transfer cylinder 43 having the same diameter as the outer cylinder 5, a rotary shaft 44 rotatably supported at the center of the transfer cylinder 43, and a ribbon fitted on the rotary shaft 44. And a feeder 45. The transport cylinders 43 need not have the same diameter, and may have a trough shape instead of a cylindrical shape.

In the above structure, when the drive motor 25 is driven to rotate the ribbon-shaped screw 7, the article to be dehydrated 11 transferred to the input port 12 by the transport device 42.
Is dehydrated in the compression dehydration zone A, is compressed in the plug zone B, and is discharged from the discharge port 15.

When the dehydrated substance 11 is squeezed, the tip of the ribbon-shaped screw 7 has an outer cylinder 5 even if a crushing reaction force is generated.
Since it is supported by the annular member 28 provided via the first bearings 21 and 22, in the same manner as in the first embodiment,
It is possible to prevent the tip end side of the ribbon-shaped screw 7 from being elastically deformed by the compression reaction force and contracting to the base end side.

Next, a third embodiment of the present invention will be described based on the overall configuration diagram of FIG. 3, in which the inlet 12 for the article to be dehydrated 11 is arranged at the base end of the outer cylinder 5, The rotary support device 20 is provided in the middle of the squeezing and dehydrating zone A, and other configurations and operational effects are the same as those of the first embodiment.

Next, a fourth embodiment of the present invention will be described with reference to the overall configuration diagram of FIG. 4. This is an effective embodiment when the ribbon-shaped screw 7 has a large diameter or a large length. In order to rotatably support the first ribbon screw 50 on the base end side, the ribbon screw 7 is divided into two in the middle of the squeezing dehydration zone A and is composed of a first ribbon screw 50 and a second ribbon screw 51. Of the first rotary support device 52, the second rotary support device 53 for rotatably supporting the second ribbon screw 51 on the tip end side, and the first rotary support device 52 and the second rotary support device 53. And an intermediate support device 54 for rotatably supporting the first ribbon screw 50 and the second ribbon screw 51 at their joints.

Since the structure of the first rotary support device 52 is the same as that of the rotary support device 20 described in the first embodiment, its description is omitted. The second rotation support device 53 is mounted between a pair of bearings 55, 56 mounted on the base end of the outer cylinder 5, is rotatably supported by the bearings 55, 56, and is fitted on the second ribbon screw 51. The ring member 57 to be worn, a ring gear 67 attached to the outer periphery of the ring member 57, and a support portion 59 above the bearing support member 58 arranged along the outer periphery of the bearings 55, 56 are rotatably supported. And the driven pinion 60. The pinion 24 and the driven pinion 60 in the first rotation support device 52 are connected by a transmission shaft 61.

The intermediate support device 54 is rotatably supported by a bearing 62 provided on the outer cylinder 5 and is fitted to the end portion of the first ribbon screw 50 so as to be slightly larger than the outer cylinder 5 on one side. It is rotatably supported by the annular support 63 and another bearing 64 provided on the outer cylinder 5 and is fitted to the end portion of the second ribbon screw 51 so as to have a larger diameter than the one side annular support 63. The one side annular support 63 and the other side annular support 65 are detachable via bolts 66, and the one side annular support 63 and the other side annular support 65 are formed.
Is covered by a cover 34 provided on the bearings 62 and 64.

The annular supports 63 and 65 may have the same diameter, and in this case as well, the joining surfaces are joined by bolts or the like. Further, the driving device may be provided in this intermediate supporting device 54.

The inlet 12 in this embodiment is
It is arranged at the base end of the outer cylinder 5, and the compression dehydration zone A has an inlet 1
2 to the second rotary support device 53, and the tip side from the second rotary support device 53 is a plug zone B.

In the above structure, when the driving motor 25 is driven, the driving force is transmitted to the ring gear 23 and the transmission shaft 61 to the ring gear 57 of the second rotation supporting device 53, and the first ribbon screw 50 and the second ribbon screw 50. The ribbon screw 51 is supported by the intermediate supporting device 54 at each end, and the first ribbon screw 50 and the second ribbon screw 51 rotate simultaneously.

In the fourth embodiment as well, similar to the first embodiment, the article to be dehydrated 1 introduced through the inlet 12 is used.
1 is squeezed and dehydrated in the squeeze dewatering zone A, squeezed in the plug zone B to be in a compacted state, and discharged from the discharge port 15 to the outside.

Even if a reaction force is generated by the squeezing of the article to be dehydrated 11, since the tip end portion of the ribbon-shaped screw 7 is supported by the annular member 57 of the second rotary support device 53, the ribbon-shaped screw 7 is the base. It can be prevented from shrinking to the end side.

Even if the second ribbon screw 51 is worn, it is not necessary to replace the entire ribbon-shaped screw 7, and only the second ribbon screw 51 needs to be replaced, which is economical and requires repair work. It can be done quickly.

Furthermore, according to the fourth embodiment of the present invention, by dividing the ribbon-shaped screw 7 into two, even if the ribbon-shaped screw 7 has a large diameter or a long size, it can be easily manufactured and transported. Can be done.

The rotary support device is not limited to the above embodiment, but the rotary support device 75 as shown in FIG.
It may be. That is, the bearing 7 is provided on the base end side of the inner cylinder 4.
A joint 71 that is rotatably fitted to the outer periphery of the ribbon screw 7 and is connected to the base end side conveying end surface 7a of the ribbon-shaped screw 7 is provided, and the outer cylinder 5 is inserted through another bearing 72 that is fitted to the joint 71. A drive motor 76 having a pinion 74 supported by the inner peripheral surface of the joint 71, the side surface of which is attached to the joint 71 and rotating integrally with a ring gear (or disc gear) 73, is provided. By driving, the ribbon-shaped screw 7 is configured to rotate.

In this case as well, it is needless to say that an annular member is provided on the side of the plug zone B of the ribbon-shaped screw 7 to prevent the ribbon-shaped screw 7 from shrinking toward the base end side, as in the above-described embodiments. . The rotation support device 75 in this embodiment can also be provided on the tip side.

Further, in the fourth embodiment, the ribbon-shaped screw is divided into two, but the present invention is not limited to this, and it may be divided into two or more depending on its length and diameter. Furthermore, the type of bearing does not matter in each of the above embodiments,
Further, the drive device may be arranged at one place or a plurality of places of the bearing portion, and the arrangement position thereof is not limited.

The shapes of the inner cylinder and the outer cylinder are not limited to those in the above embodiment, but may be cylindrical or conical. In this case, the ribbon-shaped screw is a space formed by the inner cylinder and the outer cylinder. The shape conforms to.

[0037]

As is apparent from the above description, according to the present invention, the distal end of the ribbon-shaped screw is rotatably supported by the outer cylinder via the annular member, so that the inside of the outer cylinder is inserted from the charging port. Even if a squeezing reaction force is generated when the dehydrated substance put into the annular space between the cylinders is squeezed, it is possible to prevent the distal end side of the ribbon-like screw from being elastically deformed and contracting to the proximal end side,
It is possible to reliably squeeze the material to be dehydrated.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a screw type dehydrator showing a first embodiment of the present invention.

FIG. 2 is an overall configuration diagram of a screw type dehydrator showing a second embodiment of the present invention.

FIG. 3 is an overall configuration diagram of a screw type dehydrator showing a third embodiment of the present invention.

FIG. 4 is an overall configuration diagram of a screw type dehydrator showing a fourth embodiment of the present invention.

FIG. 5 is an overall configuration diagram of a screw type dehydrator showing another embodiment of the present invention.

[Explanation of symbols]

 1 Base 4 Inner Cylinder 5 Outer Cylinder 7 Ribbon-shaped Screw 10 Annular Space 11 Dehydrated Item 12 Input Port 13 Drain Screen 15 Discharge Port 20 Rotation Support Device 23 Ring Gear 25 Drive Motor 30 Support Device 33 Annular Member 42 Transport Device 43 Transport Cylinder 50 First Ribbon Screw 51 Second Ribbon Screw 52 First Rotation Support Device 53 Second Rotation Support Device 57 Ring Gear 61 Transmission Shaft A Squeeze Dewatering Zone B Plug Zone

Claims (1)

[Claims] 1. An inner cylinder and an outer cylinder, which are concentrically arranged, and an annular space between the inner and outer cylinders, and an inlet provided at the base end side of the outer cylinder into the annular space. It is equipped with a ribbon-shaped screw that transfers the introduced dehydrated material toward the discharge port provided on the tip side of the outer cylinder, and squeezes the dehydrated material to form the drain screen formed on one or both of the inner and outer cylinders to the outside. In a screw type dehydrator for draining water, an annular member which is disposed at least on the outlet side and rotatably supported by the outer cylinder via a bearing and which is fitted to a ribbon-shaped screw is provided. A screw type dehydrator.