JPH0717639A - Shelf sweeping method for continuous unloader - Google Patents

Abstract

PURPOSE:To eliminate a problem of resticking a bulky cargo while its sweeping- down can be safely and efficiently performed by sweeping down the bulky cargo stuck to an internal wall of a hold of a ship loading the bulky cargo, by air of specific high pressure ejected from an air jet nozzle. CONSTITUTION:In an unloader 4 for unloading a bulky cargo 15 in a hold of a bulk cargo ship, a digging part 7, provided with a bucket conveyer 9 having many buckets so as to be wound to a sprocket and driven to be peripherally turned, is provided in a frame 8. This digging part 7 is supported to the point end part a supporting arm 5 through a vertical arm 6. Here onto the frame 8 of the digging part 7, a turnable, rise/fall movable and extensible/contractible air jet gun 10 is mounted. From this air jet gun 10, by ejecting air of high pressure determined by an jetting distance from a jet nozzle in a point end of the gun to a shelf, air jetting pressure and a diameter of the air jet nozzle, sweeping down the bulky cargo on the shelf is performed, and the swept bulky cargo is unloaded by the digging part 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to shelve a bulk material such as ribs on the inner wall of the hold of a bulk carrier, corrugated recesses, narrow spaces, ramps, stairs, etc., without leaving coal, iron ore, etc. It relates to a method of removing shelves.

[0002]

2. Description of the Related Art An unloader is mainly used for unloading a bulk carrier, and a bulldozer, an excavator dozer, etc. are used as auxiliary cargo handling machines for scraping work in the depths of the hold that the unloader cannot reach.

However, bulk loads attached to ribs on the inner wall of the hold, corrugated recesses, narrow spaces, ramps, stairs, etc. cannot be removed even by using a bulldozer or shovel dozer (this is called shelving).

For this reason, conventionally, a person uses a bamboo stick, a scoop, etc., a backhoe, or high-pressure water to remove shelves.

The method of manually removing the shelves using a bamboo stick, a scoop or the like is not efficient. In addition, the work environment is extremely bad due to dust and noise inside the hold, and there is a danger that people will be buried by falling loose objects. Even if a back hoe is used, the hoe does not reach the narrow area, and the deposit cannot be completely removed. As a method of performing shelving by using high-pressure water, the present inventors have disclosed in Japanese Utility Model Laid-Open No. 2-53724 that the injection direction of high-pressure water can be freely changed on the frame of the excavating part of the unloader. With a watering gun attached,
A continuous unloader shelving device having a water spray gun automatic operating device for automatically operating the direction of the water spray gun was proposed.

[0006]

The method of using high-pressure water can carry out shelving with a high efficiency, but since water is used, the deposits that have fallen contain moisture, and the sloped portion at the bottom of the hold, etc. May be redeposited on. In that case, it is necessary to work on an auxiliary cargo handling machine such as a bulldozer to remove it. SUMMARY OF THE INVENTION An object of the present invention is to provide a method for removing shelves easily and in a short time without causing the problem of redeposition because shelving is efficiently performed without using water.

[0007]

DISCLOSURE OF THE INVENTION According to the present invention, an air injection nozzle is used to inject loose material attached to the inner wall of a hold of a ship loaded with bulk material, the injection distance from the air injection nozzle to the shelf, the air injection pressure, and the air. It is characterized by ejecting high-pressure air that is determined by the diameter of the ejection nozzle to remove shelves.

[0008]

The present invention will be described in detail below. The factors for injecting high-pressure air toward the shelves and efficiently collapsing the shelves due to the collision force are the injection distance from the air injection nozzle to the shelf (load), the air injection pressure, and the air injection nozzle diameter. The present inventors have clarified their relationship by various experiments.

The following equations (1) and (2) and various coefficients are obtained by experiments. In the case of coking coal, shelving can be removed if the following conditional expressions (1) and (2) are satisfied. Further, it is more effective if the air injection nozzle is moved vertically and horizontally. F = α / L + βP + γD + δ …………………………………… (1) L: Injection distance from air injection nozzle to shelf (load) (cm) P: Air injection pressure (kg / cm ² ) D : At the air injection nozzle diameter (mm), if F> 0.5 …………………………………… (2) is satisfied, there is a shelving effect. Here, α: 10 to 20 β: 0.001 to 0.01 γ: 0.001 to 0.01 δ: 0 to 0.50

[0010]

FIG. 1 is an example showing an embodiment of shelving by the method of the present invention. In FIG. 1, a digging portion 7 supported by a supporting arm 5 and attached to a tip portion of a vertical arm 6 is inserted into a hold 2 of a hull 1 from a hold mouth 3. A bucket conveyor 9 is mounted on the frame 8 of the excavating section 7 so as to be driven to rotate, and a load 15 driven by the bucket conveyor 9 to be scraped and conveyed is stored in the hollow portion of the vertical arm 6. It is transferred to the transfer conveyor and transferred upward, and further transferred to the transfer conveyor in the hollow portion of the support arm 5 and transferred to the equipment on land.

On the frame 8 of the excavating section 7, the air jet gun 1
0 is arranged, and a surveillance TV camera 11 is installed on the vertical arm 6.
Due to this, in particular, the recesses (ribs) 12 between the side wall frames and the hold 2
While monitoring the residual state of the load attached to the corners 13 of the vehicle, the narrow part of the stairs 14, and the like, the air injection gun 10 injects high-pressure air to the remaining attachment of the load 15 to drop the load.

In this embodiment, when L = 30 cm P = 10 kg / cm ² D = 12 mm α = 15 β = 0.002 γ = 0.005 δ = 0 is set in the equation (1), the equation (1) is calculated. F = 0.58 and>
Satisfies 0.5. As a result of carrying out the shelving under these conditions, the shelves dropped extremely easily. The cargo that has been shelved by high-pressure air does not add water, so the lower slope 3 of the hold 2
Does not adhere to 8,38 '.

The method of the present invention is shown in FIG.
Using the same method as the device of Japanese Patent No. 724, that is, using a device that injects high-pressure air instead of high-pressure water, the air injection nozzle can be swung, undulated, and expanded and contracted. In FIG. 2, a bucket conveyor 9 having a large number of buckets 17 is provided on the frame 8 of the excavating unit 7 with sprockets 16, 1.
It is mounted such that it is hung around 6'and driven to rotate. On the upper surface side of the frame 8, a swivel base 18 is supported so as to be horizontally swivelable, and the swivel base 18 is also provided.
The base end portion of the undulating arm 19 is supported by the undulating arm 19 so as to be capable of undulating in the vertical direction. At the tip of the undulating arm 19, a base end of a telescopic arm 20 having an air injection nozzle 21 at the tip is fitted and supported so as to be able to extend and contract in the front-rear direction.

Therefore, the air injection nozzle 21 is provided in the swivel base 1.
Change the direction as shown by arrow a by turning 8 horizontally.
The elevation angle of the up-and-down arm 19 can change the dip angle as shown by the arrow b, and the extension and contraction of the telescopic arm 20 can change the position in the front-back direction as shown by the arrow c. , Is automatically controlled while cooperating with each other.

Next, a high pressure air control system used in the present invention will be described with reference to FIG. The high-pressure air in the air compressor 22 passes through a valve 23, a filter 24, a pressure gauge 25, and a pipe 26, and is decompressed and adjusted to a required pressure by a pressure reducing valve 27. After that, it is sent to the air injection nozzle 21 via the safety valve 28, the pipe 29, and the air-driven ball valve 30, and is injected as high-pressure air.

The air-driven ball valve 30 controls the air injection time and the air injection timing. Air driven ball valve 3
0 is an air compressor 22, a valve 23, a pipe 31, a pressure reducing valve 32,
The valve 3 uses the air sent via the pressure gauge 33 as a drive source.
4 is controlled. The air driven ball valve may use another drive source. At the start of shelving, the air compressor 22
To maintain the air pressure at a predetermined level. It is necessary to operate the air compressor 22 and maintain the air pressure at a predetermined pressure even during the unloading work. When the unloading work is completed, the operation of the air compressor 22 is stopped.

FIG. 4 shows an example of a high-pressure air injection method using the air injection nozzle 21 in the hold 2 of FIG. The vertical arm 6 that is automatically operated according to the program in accordance with the shape of the hold 2 stored in advance moves along the trajectory d in the direction of the arrow g, and accordingly, the shape of the hold 2 stored in advance. Accordingly, the air injection nozzle 21 moves in the direction of arrow h along the locus e.

During this time, the air injection nozzle 21 includes the recess 12 between the side wall frames 36 of the hold 2, the recess 12 'between the corrugations of the corrugated plate 37 of the partition wall, the narrow portion of the stairs in the hold 2, the corner of the hold 2. The high-pressure air is jetted toward the cargo that remains attached to 13 and the like as indicated by arrow f. At this time, the air injection gun automatic operation device controls so as to maintain the injection distance from the air injection nozzle to the shelf within a certain range.

The residual state of the cargo is monitored by the television camera 11, and according to the information from the television camera 11,
Although the position and orientation of the air injection nozzle 21 are modified,
It is also possible to select only the place where it is confirmed that the load is attached and remains, and to control so that the high-pressure air is automatically jetted from the air jet nozzle 21.

[0020]

According to the continuous unloader shelving method of the present invention, the following effects can be obtained. (1) Since the high-pressure air jet gun is installed on the frame of the excavator of the unloader and the shelves are removed by remote control, the shelving work can be performed safely. (2) The cargo that has been shelved by high-pressure air does not reattach to the sloped part at the bottom of the hold because water is not added. Therefore, it is not necessary to use an auxiliary cargo handling machine such as a bulldozer to remove it.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional perspective view showing an example of an embodiment of the present invention.

FIG. 2 is a partial cross-sectional perspective view for explaining the operation of the air injection gun used in the present invention.

FIG. 3 is an air system diagram for an air injection nozzle used in the present invention.

FIG. 4 is a plan view of a hold illustrating the movement trajectory of the air injection nozzle of the air injection gun of FIG. 1 and the injection direction of high-pressure air.

[Explanation of symbols]

 1 Hull 2 Vessel Hold 3 Kuraguchi 4 Unloader 5 Support Arm 6 Vertical Arm 7 Excavation Section 8 Frame 9 Bucket Conveyor 10 Air Injection Gun 11 TV Camera 12, 12 'Recess 13 Corner Corner 14 Stairs 15 Cargo 16, 16' Sprockets 17 Bucket 18 swivel 19 undulating arm 20 telescopic arm 21 air injection nozzle 22 air compressor 23 valve 24 filter 25 pressure gauge 26 piping 27 pressure reducing valve 28 safety valve 29 piping 30 air driven ball valve 31 piping 32 pressure reducing valve 33 pressure gauge 34 solenoid valve 35 Piping 36 Side wall frame 37 Partition corrugated plate 38 Inclined portions a, b, c Arrow d Vertical arm locus e Air injection nozzle locus f, g, h Arrow

Front page continuation (72) Inventor Shuji Yamato 1 Kimitsu, Kimitsu-shi Kimitsu Works, Nippon Steel Corporation (72) Inventor Takashi Takahashi 1 Kimitsu, Kimitsu-shi Kimitsu Steel Co., Ltd. In-house (72) Inventor Masuhiro Ezaki 4-9-14-1401 Shirakawa, Koto-ku, Tokyo (72) Inventor Yoshiaki Suzuki 407 Sadamoto Kimitsu-shi

Claims (1)

[Claims] 1. High-pressure air determined by using an air injection nozzle to inject the loose material attached to the inner wall of the hold of a ship loaded with the loose material, by the injection distance from the air injection nozzle to the shelf, the air injection pressure, and the air injection nozzle diameter. A continuous unloader shelving method characterized by spraying and removing shelves.