JPH0769412A - Dehydration-type belt conveyer - Google Patents

Abstract

PURPOSE:To enable a large amount of moisture sediment to be easily dehydrated by deforming the section of a belt made of materials having water permeability into an O shape from a U shape from the rear side to the front side in the conveyance direction. CONSTITUTION:A belt 6 which rotates along a conveyer frame 1 is formed by a filter cloth having water permeability, and guide device 10 composed of an upper guide 11 for supporting lug parts 8 of the belt 6 and a lower guide 12 for supporting the lower part of the belt 6 is arranged in the conveyer frame 1. And the sectional shape is deformed into an O shape from a U shape by adjusting the distance between a pair of arm members 13 of the upper guide 11, and moisture in sediment is discharged through the belt 6 after making the sediment 5 on the belt 6 in the consolidation state, so as to drop water in a filtered water receiver 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt conveyor for conveying water-containing soil, and more particularly to a belt conveyor having a dehydrating function.

[0002]

2. Description of the Related Art Conventionally, for example, in the case of dehydration of dredged soil, it has been common to discard it in a land drainage basin or settling basin and wait for it to dry naturally. It took a few months and also required a vast space depending on the amount of dredged soil, and it was difficult to secure such land in view of recent land conditions.

Therefore, recently, the dredged sand is primarily dehydrated and then dumped in a drainage pond or the like. Conventionally, thickeners that separate solid and liquid by gravity settling have been widely used for this primary treatment, but the sediment treated by this thickener, that is, sedimented sediment, is
Although the water content has decreased due to the liquid separation, the water content ratio is considerably high at 800% or more, and if it is dumped in such a drainage pond, it will take a long time for complete dehydration. Was there.

As a countermeasure against this, Japanese Patent Application Laid-Open No. 2-251258 discloses a system in which the sedimented sediment of Thickener is further subjected to a screw decanter type centrifugal separator to mechanically dehydrate it. A screw decanter centrifuge supplies muddy water into a rotating bowl that rotates at high speed and causes centrifugal force to settle solids on the inner wall of the bowl. This is because the continuous processing is possible, and it has some effect.

[0005]

However, in the dehydration treatment using the above screw decanter type centrifugal separator,
Since the bowl must be rotated at high speed, there is a certain limit to its size.If a large amount of dredged material is generated during large-scale dredging work, install multiple centrifuges. There is a problem in that the desired processing capacity must be secured, not only the installation space must be expanded, but also a significant increase in equipment cost cannot be avoided, and in addition, a large amount of power is required to increase running costs. It was

The present invention has been made in view of the above conventional problems, and provides a dewatering type belt conveyor that can easily dewater a large amount of water-containing earth and sand, thereby greatly contributing to reduction of installation space and cost reduction. The purpose is to do.

[0007]

In order to achieve the above-mentioned object, the present invention forms a belt that rotates endlessly along a conveyor frame from a material having water permeability, and the conveyor frame has a rear side in the conveying direction. From the front side to the front side, guide means for guiding the belt so that its cross section changes from a U-shape to an O-shape is arranged.

[0008]

In the dewatering type belt conveyor constructed as described above, since the belt is made of a water-permeable material, the water contained in the sand is discharged through the belt during the transportation of the sand, and the sectional shape of the belt is reduced. Since the U-shape is changed from the rear side to the front side in the conveying direction, the conveying path is narrowed to consolidate the earth and sand, and internal pressure is generated in the earth and sand to further accelerate dehydration through the belt. .

[0009]

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

1 to 5, reference numeral 1 denotes a conveyor frame, which is a frame frame 2 and a frame frame 2 forming a truss structure.
It is composed of a horizontal frame 3 which defines and forms two upper and lower belt running paths a and b. Two rollers 4, 4 are provided at both ends of the conveyor frame 1 (FIG. 5),
An endless belt 6 for transporting water-containing sand 5 described later is wound around these rollers 4. One of the two rollers 4 is configured as a drive roller driven by a motor (not shown), and the other of them is configured as a driven roller, and the belt 6 is provided in the conveyor frame 1 in accordance with the operation of the motor. The belt running paths a and b are rotated endlessly.

The belt 6 comprises a thin-walled main body portion 7 formed of filter cloth, and thick-walled rubber ears 8, 8 joined to both side edges of the main body portion 7. The ears 8 of the belt 6 have a rectangular cross section, and are joined to the main body 7 so that the entirety of the ears 8 face outward when the belt 6 is bent in a U shape. The belt 6 is always kept flat due to its elasticity.

A guide device (guide means) 10 for supporting and guiding the belt 4 is provided in the belt running path a on the upper stage of the conveyor frame 1. Guide device 10
Is provided with an upper guide 11 suspended above the frame 2 of the conveyor frame 1 and a lower guide 12 arranged on the horizontal frame 3. The upper guide 11 is a frame 2
A pair of left and right arm members 13 mounted movably in a direction orthogonal to the transport direction S and fixed in position by locking means (not shown), and rotatable to lower ends of the arm members 13. And a pair of guide rollers 14 that support the ears 7 of the belt 6 and are arranged at a predetermined pitch in the longitudinal direction of the conveyor frame 1.
The upper guide 11 can freely change the cross-sectional shape of the belt 6 from a flat plate shape to a U-shape, or from a U-shape to an O-shape by appropriately adjusting the interval and length of the pair of arm members 13. It is possible.

The lower guide 12 has a curved bracket 15 curved in a U shape in a plane orthogonal to the transport direction S.
And a plurality of guide rollers 16 arranged inside the curved bracket 15 in the circumferential direction, and are arranged at a predetermined pitch in the longitudinal direction of the conveyor frame 1 like the upper guide 11. This lower guide 12 is a belt 6
The guide roller 16 is brought into contact with the lower surface and the side surface of the belt 6 to maintain the belt 6 in a predetermined cross-sectional shape and
It plays the role of receiving the weight of.

Here, the sectional shape of the belt 6 is S
Has been changed at a predetermined pitch. That is, as shown in FIG. 4, the belt 6 is flat in a predetermined range L ₁ on the start end side (rear end side in the conveyance direction) and a predetermined range L ₇ on the end side (front end side in the conveyance direction) of the conveyor frame 2 and is a conveyor frame. The range L _{3 that} is inside by a predetermined distance from the start end of 2 is U-shaped in cross section, and the range L _{5 that} is inside by a predetermined distance from the end of the conveyor frame 2 is O-shaped in cross section. In the spaces L ₂ , L ₄ , and L ₆ , it is a gradual change portion from a flat plate shape to a U shape, a U shape to an O shape, and an O shape to a flat shape. The distance between the pair of arm members 13 forming the upper guide 11 is adjusted according to each of the above ranges, and in the O-shaped cross section range L ₅ , the distance between the pair of arm members 13 is maximized as shown in FIG. On the other hand, in the range L _{3 having a} U-shaped cross section, as shown in FIG. 2, the pair of arm members 13 are opened at appropriate intervals. In the range L ₅ of O-shaped cross section, the two ears 8 of the belt 6 are sandwiched by the pair of arm members 13 of the upper guide 11 and the main body 7 of the belt 6 is completely bag-shaped. .

Therefore, the guide device 10 has the above-mentioned cross section U.
Character shape range L ₃ and gradual change range L ₄ from U shape to O shape
In FIG. 2, an auxiliary guide 11 'is provided to press the ears 8 of the belt 6 from the inside so as not to come off from the upper guide 11 (FIG. 2). Further, the guide device 10 has an O-shaped section L range.
₅ has a middle guide 17 (FIG. 3). The middle guide 17 is composed of a bracket 19 extending horizontally from a pillar 18 bridged between the frame 2 and the horizontal frame 3 and a pressing roller 20 rotatably attached to the tip of each bracket 19. The pressing rollers 20 are arranged so as to press the bag-shaped portion of the belt 6 having an O-shaped cross section obliquely from above to below.

On the other hand, in the belt running path b at the lower stage of the conveyor frame 1, a pedestal 21 is used and a return roller 22 is provided.
Is rotatably arranged. This return roller 22
Is for supporting the belt 6 that spreads in a flat plate shape and returns, and is arranged at a predetermined pitch in the longitudinal direction of the conveyor frame 1. Further, in the upper belt running path a of the conveyor frame 1, a filtered water receiver 23 is disposed below the lower guide 12. This filtered water receiver 2
The reference numeral 3 serves to receive filtered water that has passed through the belt 8 and dropped, and is continuously extended in the longitudinal direction of the conveyor frame 1.

The cross section U of the conveyor frame 1 is described above.
A unidirectional rotary blade 24 for restricting the return of the earth and sand 5 by inserting the tip portion into the U-shape of the belt 6 is arranged in the portion corresponding to the letter-shaped range L _3, and the rear end portion of the conveyor frame 1 is provided. The belt 6 is wound around the driving roller 4 and returns.
A brush 25 for scraping off the earth and sand (remaining soil) from the surface of is disposed.

The operation of the belt conveyor constructed as above will be described below. In addition, this article describes the case where the sediment treated by the thickener, that is, sedimentation sediment is transported to the drainage pond.

When the drive roller 4 is rotated by the operation of a motor (not shown), the belt 6 rotates the belt running paths a and b in the conveyor frame 1 endlessly. At this time,
The belt 6 is supported and guided by the upper guide 11 and the lower guide 12 of the guide device 10 in the belt running path a of the upper stage, and its cross section changes from a flat plate shape to a U shape, and from a U shape to an O shape.
The shape is continuously changed from the O shape to the flat shape. Then, when the settled sediment 5 of the thickener is put on the belt 6 on the starting end side of the conveyor frame 1, the sediment 5 is formed as shown in FIG.
As shown in FIG. 5, the belt 6 is taken into the U-shaped groove that changes its shape from a flat plate shape to a U-shape, and is prevented from falling from the side edge of the belt 6 and is conveyed. And during this transport,
Water contained in the earth and sand is discharged through the belt 6, and this water falls into the filtered water receiver 23.

Thereafter, the sand 5 on the belt 6 changes its shape from a U-shape to an O-shape as shown in FIG.
Are taken into the bag-shaped part of. In this state, the soil 5 receives pressure from the belt 6 and becomes a consolidated state, and as a result,
Internal pressure is generated in the sand 5 on the belt 6, and dehydration through the belt 6 is promoted. It should be noted that due to this internal pressure, the earth and sand 5 try to flow backward toward the starting end side (the rear side in the conveying direction) of the conveyor frame 1, but the one-way rotary blade 24 regulates the reverse flow, and the earth and sand 5 moves forward in the conveying direction. Therefore, the middle guide 17 is provided on the front side in the conveying direction, and
As shown in FIG. 6, the pressing roller 20 of the middle guide 17 presses the bag-shaped portion of the belt 6 from above. As a result, a larger internal pressure is generated in the earth and sand 5, and the dehydration through the belt 6 is further promoted. In this way, a large amount of water is removed from the settled sediment 5 of the thickener, and the sediment having a small amount of water is dropped from the rear end of the conveyor frame 1 to the drainage pond. On the other hand, the belt 6 which has discharged the earth and sand winds around the drive roller 4 and returns to the belt running path b in the lower stage.
The residual soil on the belt 6 is scraped off by 5.

In the above embodiment, the main body portion 7 of the belt 6 is formed of a filter cloth, but this belt material is optional as long as it has flexibility and water permeability. It is possible to use a rubber plate having the open pores. Further, although the roller type guide means is used as the guide means for guiding the belt 6 in the above-mentioned embodiment, the guide means may be of any type, for example, a wire mesh, a rail or the like may be used. Further, the applicable range of the present invention is also arbitrary, and it can be used for transporting other sediment containing appropriately water instead of transporting the settled sediment of the thickener. In addition, this belt conveyor may be used by connecting multiple of them, or may be installed on a pontoon floated on the water. In the former case, the conveying distance can be extended as much as possible, and the latter. In this case, the filtered water receiver 23 can be omitted.

[0022]

As described above in detail, according to the dewatering type belt conveyor of the present invention, the cross section of the belt formed of the material having water permeability is U-shaped from the rear side to the front side in the conveying direction. Since it is changed to an O-shape, the transported earth and sand is in a consolidated state, and the water contained in the earth and sand is efficiently discharged through the belt, so that a large amount of water-containing earth and sand can be easily dehydrated. Further, since dehydration can be performed during transportation, special dehydration equipment such as a centrifuge is not required, and not only the cost required for dehydration can be significantly reduced but also a large space saving can be achieved.

[Brief description of drawings]

FIG. 1 is a sectional view taken along the line BB of FIG. 4, showing the structure of a dehydration type belt conveyor according to the present invention.

2 is a sectional view taken along the line AA of FIG. 4 showing the structure of the present dehydration type belt conveyor.

FIG. 3 is a cross-sectional view showing the structure of the present dehydration type belt conveyor, which is taken along the line C-C of FIG. 4.

FIG. 4 is a plan view schematically showing the overall structure of the present dehydration type belt conveyor.

FIG. 5 is a front view schematically showing the overall structure of the present dehydration belt conveyor.

[Explanation of symbols]

 1 Conveyor frame 5 Sediment 6 Belt 8 Ear 10 Guide device 11 Upper guide 12 Lower guide 17 Middle guide 22 Return roller 23 Filter water receiver

Claims (1)

[Claims] 1. A belt that rotates endlessly along a conveyor frame is formed of a water-permeable material, and the belt has a U-shaped to O-shaped cross section in the conveyor frame from the rear side to the front side. A dehydration type belt conveyor, characterized in that guide means for guiding it to change is provided.