JPH0649636Y2 - Dredging device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an apparatus for dredging sludge, soft mud, etc. (hereinafter abbreviated as "sludge") accumulated on the seabed or the like.

[Prior Art] As a conventional dredging device, there is a pump type. In this pump type dredging device, a large-capacity pump is installed on a barge or the like, a hose is extended from the pump to the bottom of the water such as the seabed or lake, and the sludge is sucked up together with the water. And the sludge dredged in this way is mainly carried to a landfill by a carrier. At the landfill site, a solidifying agent and a coagulant are added to solidify.

[Problems to be solved by the invention] However, in the above-mentioned conventional dredging device, when the deposition depth of sludge is small, a part of the intake port of the dredging device is directly exposed to the bottom of the water and sucked up simultaneously with the sludge. The amount of water taken up is too large, and the solidifying agent cannot be mixed until after the treatment of residual water, and there is a disadvantage that the treatment of residual water requires a great deal of cost.

[Means for Solving the Problems] The dredging device of the present invention is provided with an inlet device at the tip of a screw conveyor having an opening for sludge intake on the side of the tip, and the inlet device is provided around the inlet device and is provided around the inlet device. A mud board was provided to cover a part.

[Operation] In the dredging device of the present invention, the inlet device is moved in a predetermined direction after being inserted into the sludge accumulated on the bottom of the sea such as the seabed, the lake bottom, the riverbed, etc. Since sludge is moved while being gathered by the arranged mud collecting plates, the inlet of the screw conveyor is always filled with sludge, which prevents water from entering.

[Embodiment] The present invention will be described in detail below with reference to an embodiment shown in the drawings.

FIG. 1 is a cross-sectional view of essential parts showing an embodiment of the dredging device according to the present invention. Reference numeral 1 is a rigid screw conveyor,
It is provided with a tubular casing 2 and a screw shaft 3 which is internally provided in the tubular casing 2 and in which screw blades 4 are fixedly installed. The cylindrical casing 2 is provided with an opening 5 at its tip for taking in sludge.
Are provided in a substantially rectangular shape so as to be long in the axial direction of the tubular casing 2, and a plurality of are provided at regular intervals in the circumferential direction.

An inlet device 6 for sludge scraping is provided at the tip of the rigid screw conveyor 1. This inlet device 6 has a screen 7, a blade 8 and a water stop plate 9. The screen 7 is for preventing large rocks and foreign matters from entering the tubular casing 2 through the opening 5, and has a ring shape that surrounds the tubular casing 2. This screen 7
Are fixed to the distal end portion (portion where the opening 5 is provided) of the tubular casing 2 and are separated by a predetermined distance in the axial direction of the tubular casing 2 (7 in this embodiment).
Are provided). The blade 8 is arranged around the screen 7 and is fixed to the tip end side of the rotary cylinder 11 via a water stop plate 9. The blade 8 is a cylindrical casing 2
Are provided in the circumferential direction of the
As shown in FIG. 1, rakes 12 are fitted and arranged between the screens 7, and foreign substances on the screens 7 are removed by the rakes 12. Further, the water stop plate 9 located on the rear end side (the upper end side in the figure) of the blade 8 is fixed to the rotary cylinder 11, and the water in the upper layer passes from the rear end side of the blade 8 through the opening 5. The cylindrical casing 2 is prevented from invading. This reduces the amount of water sucked up at the same time as sludge.

As shown in FIG. 2 which is a schematic cross-sectional view taken along the line II-II of FIG. 1, the mud collecting plate 10 is formed so that its lower portion covers approximately half of the outer circumference of the inlet device 6, and the screw conveyor 1
It is arranged so as to be able to turn around as shown by an arrow W. That is, in the mud collecting plate 10, the rack gear 10a provided on the inner peripheral portion of the upper end of the mud collecting plate 10 is constantly meshed with the output gear 18a of the hydraulic motor 18 attached to the tubular casing 2.
It is possible to turn by driving. Reference numeral 19 is a bracket for supporting the mud collecting plate 10, and a bearing 20 is interposed between the bracket and the mud collecting plate 10. Further, the upper portion of the mud collecting plate 10 is formed in a cylindrical shape, and is formed so as to cover the outer peripheral portion of the rotary cylinder 11 and a part of the outer peripheral surface of the cylindrical casing 2 thereon.

The rotary cylinder 11 is mounted coaxially with the cylindrical casing 2 of the rigid screw conveyor 1 and rotatable about its axis. Further, a rack gear 13 is provided around the upper part of the rotary cylinder 11, and the rack gear 13 is always in mesh with a pinion gear 14. This pinion gear 14
Is a drive shaft provided along the side surface of the tubular casing 2.
It is fixed to the bottom edge of 15. The upper end of the drive shaft 15 is connected to a motor 16 fixed to the cylindrical casing 2, and the rotation of the rotary cylinder 11 is driven by the drive of the motor 16 via the drive shaft 15, the pinion gear 14 and the rack gear 13. It is designed to be used. The screw shaft 3 is a tip member provided at the tip of the cylindrical casing 2.
It is rotatably supported with respect to 17.

Next, the operation of the dredging device configured as above will be described. At the same time as the drive unit of the dredger (not shown) is operated, the inlet unit 6 located at the tip of the rigid screw conveyor 1 is inserted into the sludge at the bottom of the water, and the drive unit (not shown) of the screw shaft 3 is rotated. The motor 16 is rotated. The rotation of the motor 16 causes the blade 8 and the rake 12 to rotate integrally with the water stop plate 9 via the rotary cylinder 11, and the rotation of the blade 8 causes sludge to enter the tubular casing 2 through the opening 5. take in. At this time, the foreign matter mixed in the sludge is prevented from entering through the opening 5 by the screen 7.

Further, the dredging device is moved in a predetermined direction with the inlet device 6 inserted in the sludge.
The motor 10 is rotated and disposed rearward in the traveling direction (arrow A direction) by the rotation of the motor 18. Therefore, when proceeding, the mud collecting plate 10
The sludge will be pushed forward to the sludge, and the sludge will be collected on the front side of the mud collecting plate 10. Therefore, the opening 5 is always buried in the sludge, and substantially only the sludge is taken in from the opening 5, and the infiltration of water is prevented.

Further, the water in the upper layer, which is about to flow into the opening 5 from the upper side of the blade 8, is prevented from entering by the water stop plate 9.

On the other hand, the sludge introduced into the tubular casing 2 through the opening 5 rises in the tubular casing 2 by the rotation of the screw shaft 3 and is discharged from a drainage port (not shown) to a predetermined place. For example, the sludge discharged from the screw conveyor 1 is dumped to a landfill site via a carrier, a pressure-feeding hose, etc. after a solidifying agent is added and mixed.

Inlet devices other than those shown may also be used in the present invention. An example thereof is shown in FIGS.

In FIG. 3, the inlet device 6 includes a tapered canopy member 20 fixed to the lower end of the rotary cylinder 11, and an inner blade 21 and an outer blade 22 for sludge scraping which are vertically provided from the canopy member 20. The bar screens 23 (the plan view of which is shown in FIG. 4) are formed in a substantially triangular ring shape and are vertically arranged in multiple stages (three stages in this embodiment). The bar screen 23 is fixed to each blade 21, 22 by welding or the like. The rotary cylinder 11 is rotatably drivable by the motor 16 (not shown in FIG. 3) provided at a middle height portion of the screw conveyor 1. By rotating the rotary cylinder 11, the canopy is rotated. Each blade 2 through the member 20
1, 22 and the bar screen 23 rotate integrally. The tip of the bar screen 23 is a rake part 24, and when the screen is rotated, the sludge around it is destroyed. Then, the blades 21 and 22 are inserted from the opening 5 at the tip of the tubular casing 2 into the inside. The screen 23 prevents large rocks and foreign matter from being taken into the screw conveyor 1.

The lower ends of these blades 21, 22 are fixed to the block 25,
The block 25 is engaged with the tip of the screw shaft 3 via a bearing 26. Bearings 27 and 28 are also interposed between the tubular casing 2 and the block 25 and between the tip of the tubular casing 2 and the screw shaft 3, respectively.

In the above embodiment, the mud collecting plate 10 is provided so as to be rotatable in the circumferential direction of the vertical screw conveyor 1, but this is fixed to the outer periphery of the cylindrical casing 2 and the rigid screw conveyor 1 is provided.
It is also possible to change the direction of the entire vertical screw conveyor 1 in accordance with the traveling direction of the vertical screw conveyor 1 so that the mud collecting plate 10 comes in the opposite direction to the traveling direction of the vertical screw conveyor 1.

[Effect] As described above, according to the present invention, since sludge collected by the mud collecting plate is introduced into the screw conveyor, the residual water is extremely reduced, and the sludge disposal cost can be significantly reduced. . Further, since the inlet device is provided on the tip side of the screw conveyor, the efficiency of taking sludge into the screw conveyor is improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing an embodiment of the dredging device according to the present invention. FIG. 2 is a plan sectional view of the mud collecting plate. FIG. 3 is a sectional view showing another inlet device, and FIG. 4 is a plan view of a bar screen. 1 ... Hard screw conveyor, 2 ... Cylindrical casing, 3 ... Screw shaft, 4 ... Screw blade, 5 ... Opening 6 ... Inlet device, 10 ... Mud board, 11 ... Rotating cylinder, 23 ... Bar screen.

Claims (1)

[Scope of utility model registration request] 1. A screw shaft having screw blades fixedly mounted in a tubular casing, and a screw conveyor having an opening opened laterally to the tip of the tubular casing, and provided at the tip of the screw conveyor. A dredging device provided with the inlet device, wherein the mud collecting plate is provided to cover a part of the outer circumference of the inlet device.