JPH0255567B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an obstacle removal device for continuously removing obstacles such as stone blocks sucked into the inner pipe of the rudder of a pump dredger.

(Prior art) Generally, when a pump-type dredger is dredging the water bottom, if an obstruction such as a stone block that is larger than the particle size passing through the dredging pump's impeller is sucked into the suction pipe of the dredger, the performance of the pump decreases and vibrations occur. Because of this, it is necessary to interrupt operation and remove any obstructions that may have gotten caught in the impeller.

For this reason, conventionally when dredging in areas with many obstacles, a rostol was attached to the cutter head to prevent the obstacles from being sucked in. However, even with this method, obstacles become trapped in the rostle during dredging work, and as a result, the suction efficiency of the main pump deteriorates, so it is necessary to remove the obstacles.

During this obstacle removal work, the operation of the main pump is temporarily stopped, the cutter is raised above the water surface, and then the workers manually remove the stones, etc. that have been caught in the rostol, so this work takes a considerable amount of time. That's what it takes. Furthermore, if an obstacle is caught in the main pump, a worker must enter the pump and remove it manually after draining the water inside the main pump, resulting in a large time loss due to the series of operations.

An object of the present invention is to provide an obstacle removal device for a pump dredger that can continuously and easily remove obstacles without interfering with pump operation.

(Means for Solving the Problems) In order to solve the above-mentioned problems, an obstacle device for a pump dredger according to the present invention is provided with an opening on the lower surface in the middle of the inner pipe of the rudder of the pump dredger. A branch cylinder body is connected to the lower surface of the ladder inner tube in accordance with the above, and a shutter is rotatable by a main shaft so that a position for closing the opening and a position for closing the ladder inner tube can be taken within the opening. Pivotally supported,
An obstacle blocking rostol is attached to the main shaft so as to be oriented across the rudder inner tube when the shutter is closing the opening;
A shutter/roster rotation driving means for rotating the shutter and the obstacle blocking roosttle is provided outside the rudder inner tube, and a drive means for rotating the shutter/roster is provided inside the branch/cylindrical body at a position corresponding to the main shaft. A lower rotor is fixedly installed to partition the upstream side chamber and the downstream side chamber, and at the lower end of the branch cylinder body, an obstacle-excluding opening/closing lid is rotatably supported by a secondary shaft. a scraper rostre that protrudes into the downstream chamber in the branch cylinder when the opening/closing lid is in the closed state, and passes through the gap of the lower rostre to scrape obstacles out of the branch cylinder when the opening/closing lid is in the open state; An obstacle for a pump dredger, characterized in that the branch cylinder body is supported, and a lid/roistle rotation driving means for rotating the obstacle removing opening/closing lid and the scraping roistle is provided outside the branch cylinder body. Features a removal device.

(Function) In such an obstacle removing device, an obstacle blocking roistle is normally placed on standby in a direction that crosses the rudder inner tube, so that the obstacle is prevented from passing by this rostrtle. If an obstacle hits the shutter, operating the shutter/roster rotation drive means will cause the shutter and obstacle blocking roost to move.
By rotating 90 degrees, one side of the shutter closes the inner pipe of the rudder, and the obstacle blocking rostle crosses one side of the opening, allowing the dredging flow to flow from the upstream chamber in the branch cylinder to the downstream chamber and into the rudder. The flow changes to the downstream side of the pipe. As a result, the obstacle that has been blocked by the obstacle blocking rostle falls into the upstream chamber within the branch cylinder and is blocked by the lower rostol.
In this state, when the lid/rosttle rotation driving means is operated, the obstacle removal opening/closing lid opens, and the scraping roistle passes through the gap of the lower roistle to scrape the obstruction out of the branch cylinder.

(Example) Examples of the present invention will be described in detail below with reference to FIGS. 1 to 4. As shown in the figure, the dredger 1 is fixed to the water bottom 3 by spuds 2. A rudder 4 is suspended in the water from the dredger 1 by a hanging means 5, and a cutter head 6 is supported at the tip of the rudder 4.

A ladder inner pipe 7 is supported within the ladder 4, and the ladder inner pipe 7 is connected to a dredging pump 8 on the dredger 1 to suck up dredged earth and sand together with water. A discharge pipe 9 is connected to the discharge side of the dredging pump 8.

An obstacle removing device 10, which is a main part of the present invention, is provided in the middle of the ladder inner tube 7, and an obstacle reservoir 11 is provided surrounding the obstacle removing device 10.

The obstacle removing device 10 includes an opening 11 provided on the lower surface of the ladder inner tube 4 , and a branch cylinder 12 surrounding the opening 11 and connected to the lower surface of the ladder inner tube 4 . Inside the opening 11, the opening 11
The shutter 13 is rotatably supported by a main shaft 14 so as to be in a position where it closes the rudder inner tube 4 and a position where it closes the rudder inner tube 4.

An obstacle blocking roistle 15 is attached to the main shaft 14 so as to cross the rudder inner tube 4 when the shutter 13 is blocking the opening 11, and is configured to block the passage of an obstacle 16. There is. A cylinder 18 is provided outside the rudder inner tube 4 and is a driving means for rotating the shutter rosttle 13 and the obstacle blocking rosttle 15 via a link arm 17. A lower roistle 19 is fixedly installed in the branch cylinder 12 at a position corresponding to the main shaft 14 to partition the inside of the branch cylinder 12 into an upstream chamber 12A and a downstream chamber 12B. At the lower end of the branch cylinder body 12, an opening/closing lid 20 for removing obstacles is rotatably supported by a sub-shaft 21. This opening/closing lid 20 for removing obstacles projects into the downstream chamber 12B in the branch cylinder body 12 when the opening/closing lid 20 is in the closed state, and has a space between the lower roistle 19 when the opening/closing lid 20 is in the open state. Passing through the gap 19A,
A scraper roistle 22 for scraping the obstruction 16 on the opening/closing lid 20 out of the branch cylinder 12 is supported. Outside the branch cylinder body 12 is an opening/closing lid 2 for removing obstacles.
A cylinder 24 is provided which is a drive means for rotating the lid/roistle and rotates the scraper rooster 22 via a link 23.

When the obstacle 16 hits the obstacle blocking throttle 15, the suction pressure etc. changes, so check the changes in the suction pressure etc. with a gauge in the driver's cab, operate the cylinder 18 from the driver's cab, and start the shutter. 13 and the rotor 15 are rotated 90 degrees as shown in FIG. As a result, the opening 11 opens and the rudder inner tube 4 is instead blocked by a part of the shutter 13.
The flow of the dredging fluid is forcibly changed to a flow that bypasses the branch cylinder 12 as shown by the arrow in FIG. 3, and the obstacle 16 caught between the rostles 15 is pushed out from behind by the flow.

Therefore, the obstruction 16 is easily removed from the rostol 15 and deposited on the lid 20 in the upstream chamber 12A.

Several tens of seconds after the cylinder 18 completes its operation,
Shutter 13 and Roster 15 to cylinder 1
Rotate it 90 degrees using step 8 and return it to the normal position. This allows normal dredging work. Thereafter, the cylinder 24 is operated to open the opening/closing lid 20 and the obstacle 16 is scraped out of the branch cylinder body 12 by the scraper roistle 22. Thereafter, the opening/closing lid 20 and the scraping rooster 22 are returned to their original positions by reverse operation of the cylinder 24. The discharged obstacles 16 are once collected in the obstacle reservoir 11 and disposed of appropriately.

(Effects of the Invention) As explained above, the obstacle removal device for a pump dredger according to the present invention usually has an obstacle blocking rostol protruding inside the rudder inner pipe, and prevents obstacles from hitting the rostrum. At this time, the rostle and the shutter that closed the opening of the rudder inner pipe are rotated so that the inside of the rudder inner pipe is closed by a part of the shutter so that the flow of dredging fluid bypasses the inside of the branch cylinder. , Obstacles blocked by the rostle can be easily dropped into the branch cylinder using the flow of dredging fluid. Inside the branch cylinder, a lower roistle prevents obstacles from being washed away, and when the obstacle removal lid is opened, a scraper roistle is used to scrape them out of the branch cylinder, making it easy to scrape out obstacles. be able to. Therefore, according to the present invention, obstacles can be easily removed mechanically without stopping the dredging pump, and without the hassle of lifting the cutter or ladder above the water surface and removing the obstacle manually. There is no time loss due to obstacle removal work, and the efficiency of the entire dredging work can be improved.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a main part of an embodiment of the obstacle removal device for a pump dredger according to the present invention, FIG. 2 is a cross-sectional view taken along the line A-A in FIG. 1, and FIG. An explanatory diagram of the operating state, FIG. 4 is a side view of the dredger. 1... Dredger, 4... Rudder, 6... Cutter head, 7... Rudder inner pipe, 8... Dredging pump,
10... Obstacle removal device, 11... Opening, 12
...Branch cylinder, 13...Shutter, 14...Main shaft, 15...Obstacle-blocking rosttle, 16...Obstacle, 18...Shutter/rosttle rotation drive means (cylinder), 19...Lower rosttle ,2
0...Opening/closing lid for removing obstacles, 21...Subshaft, 22
...Scraping rooster, 24... Drive means (cylinder) for rotating the lid and rostr.

Claims (1)

[Claims] 1. An opening is provided on the lower surface of the inner ladder pipe of the pump dredger in the middle, a branch cylinder is connected to the lower surface of the inner ladder pipe corresponding to the opening, and a branch cylinder body is connected to the lower surface of the inner ladder pipe in correspondence with the opening, and the opening is closed within the opening. A shutter is rotatably supported by a main shaft so as to be in a position where the opening is closed and a position where the shutter is in a position where the opening is closed. The obstacle blocking rostle is attached in this way, and a shutter/rosttle rotation driving means for rotating the shutter and the obstacle blocking rostol is provided outside the rudder inner tube, and inside the branch/cylinder A lower rotor is fixedly installed in the branch cylinder to partition it into an upstream chamber and a downstream chamber at a position corresponding to the main shaft, and at the lower end of the branch cylinder, an opening/closing lid for removing obstacles is rotatably mounted on a subshaft. The opening/closing lid for removing obstacles projects into the downstream chamber in the branch cylinder body when the opening/closing lid is in the closed state, and passes through the gap in the lower roistle when the opening/closing lid is in the open state. A scraping roistle for scraping obstacles out of the branching cylinder is supported, and a lid/roistle rotation driving means for rotating the obstacle removal opening/closing lid and the scraping roistle is provided outside the branching cylinder. An obstacle removal device for a pump-type dredger, which is characterized by: