JP2013173468A - Unloading system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use a pump to efficiently unload cargo, while reducing equipment cost required for unloading.SOLUTION: An unloader ship 10 for unloading cargo S loaded on a bulk carrier 1 includes an underwater pump 3 for sucking the cargo S, and a water pump 4 for supplying water W to a hold. The water pump 4 supplies the hold 2 with water, and the underwater pump 3 sucks the cargo S mixed in the water W to be unloaded. The underwater pump 3 is used to smoothly unload the cargo S, irrespective of the height from the bottom of the hold 2 to a deck. No pump station is required for unloading in the bulk carrier 1, thereby reducing equipment cost for installation thereof.

Description

  The present invention relates to an unloading system used when unloading a load from a bulk cargo ship loaded with load such as earth and sand.

  There are various means for unloading a load from a bulk carrier loaded with load such as earth and sand. For example, in the configuration shown in Patent Document 1, a method of scooping up the load with a bucket is adopted. doing. This method can easily pick up the load when the load is fully loaded, but it is difficult to pick up the load that remains slightly at the bottom of the hold at the final stage of unloading. There are many cases.

  Therefore, in order to efficiently unload the load to the end, as shown in FIG. 2, a configuration in which the load S is sucked by the suction force by the suction pump 12 may be employed. In this configuration, a suction pump 12 for sucking the load S is mounted on the unloader ship 10 (base ship), a suction hose 6 is connected to the suction pump 12, and the suction port 6 a of the suction hose 6 is connected to the inside of the hold 2. It arrange | positions so that it may insert in the load S of No ..

  The bulk carrier 1 loaded with the load S has various sizes, and in particular, a large one has a high height of the freeboard of the ship (a part above the water surface of the ship). For this reason, it is necessary for the suction hose 6 to get over this freezer and the total length thereof is often very long. In this case, the suction of the load S may be hindered due to insufficient suction capacity of the suction pump 12. Further, even when the suction pump 12 having a sufficient suction capacity is used, it is physically impossible to suck up to a height of about 10 m or more with only the suction force under atmospheric pressure. That is, the configuration shown in FIG. 2 cannot be applied to a large bulk carrier 1 in which the height from the bottom of the hold 2 to the deck (the height indicated by the symbol h in the figure) exceeds about 10 m.

  For this reason, instead of sucking the load with the pump mounted on the unloader ship, for example, as shown in Patent Document 2, Patent Document 3, etc., a bulk cargo ship is provided with a pump station equipped with a submersible pump for suction. In many cases, a method of sucking up and unloading a load such as earth and sand that is turbid with water is employed. In this case, as long as the discharge capacity of the pump is high, the load can be unloaded regardless of the height from the bottom of the hold to the deck. When unloading the load, the pump station is assembled on the bulk carrier at the port each time (Patent Document 2), or mounted in the bulk cargo ship in advance (Patent Document 3). )

JP-A-5-238474 Special Table 2002-533264 JP-A-8-302729

  As shown in Patent Document 2 and Patent Document 3, in a configuration in which a pump for sucking a load is provided in a bulk cargo ship, either when a pump station is permanently installed or when a pump station is installed at the time of unloading There is a problem that the cost for installation (and removal) is required. Also, depending on the characteristics of the load (viscosity, specific gravity, etc.), a high-performance pump with a larger suction force may be required. However, when a pump station is permanently installed, it is not easy to replace only the pump. There is also a problem that it may not be possible to sufficiently cope with loads having different characteristics.

  Accordingly, an object of the present invention is to efficiently unload a load using a pump and to reduce the equipment cost related to the unloading.

  In order to solve the above-mentioned problems, the present invention provides an unloading system used when unloading a load such as earth and sand loaded on a bulk carrier, and a submersible pump for sucking the load, and a hold of the bulk carrier. The unloader ship is equipped with a water pump for feeding water into the unloader ship, the unloader ship is placed on the bulk cargo ship, the submersible pump is installed in the hold, and the water pump is used to feed water into the hold. On the other hand, the unloading system was configured such that the load turbid with the water was sucked with the submersible pump, and the load was unloaded from the bulk carrier.

  Thus, by providing the submersible pump in the unloader ship, it is not necessary to provide suction means such as a pump station in the bulk carrier. For this reason, the installation cost can be reduced. Moreover, depending on the characteristics of the load to be sucked in, unloader ships equipped with submersible pumps having different performances can be properly used, and the work for unloading the load can be performed efficiently.

  A suction hose is connected to the submersible pump, and the suction hose extends to the unloader ship side. This submersible pump has an action of sucking the load and discharging the sucked load into the suction hose. For this reason, even a large bulk carrier with a height from the bottom of the hold to the deck of nearly 10 m can unload the load smoothly.

  When unloading the load such as earth and sand, the water injected into the hold is also sucked together with this load. This is because the fluidity is improved by sucking together with water, and the efficiency of unloading the load increases. At this time, in order to continue unloading stably, it is preferable to supply a new amount of water corresponding to the amount of sucked water to the hold. Therefore, by installing a water pump on the unloader ship, a series of operations such as suctioning the load and injecting water into the hold can be performed only with the equipment mounted on the unloader ship, so it is very efficient. It is.

  In the said structure, it is preferable to provide a cooling mechanism in the motor which drives the said submersible pump.

  This submersible pump is generally used in a state where it is submerged in dredging work at a port or the like, and the motor for driving the pump is cooled by contact with surrounding water or earth and sand. However, in the configuration of the present invention, in the final stage of the unloading work of the load (a state where almost no load remains in the hold), most of the submersible pumps are exposed from the load turbid with water. It becomes a state. Thus, when the submersible pump is exposed, the motor is not sufficiently cooled, and troubles such as failure may occur. Therefore, by providing the cooling mechanism, the motor is cooled even when the submersible pump is exposed, and the trouble can be prevented.

  As this cooling mechanism, various methods such as a water cooling method and an air cooling method can be adopted. However, since this submersible pump is used in an environment where a sufficient amount of water can be secured, such as the sea or a river, It is most suitable to adopt the method.

  In each said structure, it is preferable to provide the booster pump which assists the discharge capability of the said submersible pump.

  According to the configuration using the submersible pump, even a large bulk carrier can unload the load without any problem, but the submersible pump discharge capacity is insufficient and the delivery of the load is smooth. It can happen that this is not done. Therefore, by providing a booster pump in the middle of the suction hose to assist the discharge capacity, the load can be sent far away.

  The present invention employs a configuration in which a set of equipment such as a submersible pump for sucking a load is mounted on an unloader ship that lies next to a bulk carrier. This submersible pump is inserted directly into the load loaded on the bulk carrier and ejects it by pushing the load through the hose connected to the submersible pump, regardless of the size of the bulk carrier. Unloading can be performed smoothly. In addition, since it is not necessary to provide an unloading facility such as a pump station on the bulk carrier side, the equipment cost of the bulk carrier can be reduced.

Configuration diagram of unloading system according to the present invention Configuration diagram of unloading system according to the prior art

  The configuration of the unloading system according to the present invention is shown in FIG. This unloading system is used when unloading a load S (sediment in this configuration) loaded in a hold 2 of a bulk cargo ship 1, and includes an underwater pump 3 for sucking the load S, and a bulk cargo ship. A water pump 4 for feeding water into one hold 2, a booster pump 5 for assisting the discharge capacity of the submersible pump 3, a suction hose 6 connected to the submersible pump 3, and a water hose 7 connected to the water pump 4 The unloader ship 10 includes a power source 8 (motor 8a or engine 8b) that drives each pump and a speed reducer / speed increaser 9 that adjusts the rotational speed of the booster pump 5.

  This submersible pump 3 is inserted into the load S when the load S is unloaded, and is built into the submersible pump 3 by the load S around the submersible pump 3. A motor (not shown) is cooled. However, in the final stage of unloading, the submersible pump 3 is exposed from the load S, the motor is not sufficiently cooled, and troubles due to overheating of the motor are likely to occur. Therefore, a water cooling mechanism (not shown) is provided in the submersible pump 3, and the cooling water C is circulated through the flow path in the water cooling mechanism so that the motor can be cooled, and trouble caused by overheating of the motor can be prevented. Occurrence is prevented. The suction port 11a of the cooling water hose 11 is in the sea, and the sucked cooling water C (seawater) can be smoothly circulated through the flow path. The cooling water C used for cooling is drained as it is.

  The suction hose 6, the water supply hose 7, and the cooling water hose 11 are all supported by an arm member (not shown), and by moving this arm member, the tips (and The submersible pump 3) can be freely moved to any position in the hold 2. For this reason, water can be uniformly supplied into the hold 2 and the load S remaining in the corner of the hold 2 can be sucked cleanly to the end.

  When unloading the load S from the bulk carrier 1, the unloader ship 10 is placed next to the bulk carrier 1. Then, the suction port 7a of the water supply hose 7 connected to the water supply pump 4 is introduced into the water such as the sea, and the discharge port 7b is provided on the side of the hold 2 and water W is supplied into the hold 2 from the discharge port 7b. By mixing the water W and the load S (such as earth and sand), the water W and the load S become turbid. The submersible pump 3 is inserted into the cloudy load S to suck the load S, and it is conveyed to a predetermined place through the suction hose 6. A booster pump 5 is provided in the middle of the suction hose 6. By operating the booster pump 5 and assisting the discharge capacity of the submersible pump 3, the load S can be conveyed further. . When the transport distance is short or when the discharge capacity of the submersible pump 3 is sufficiently large, the booster pump 5 can be omitted or the operation can be stopped as appropriate.

  When the load S is sucked, water W (seawater or the like) is continuously supplied from the water supply pump 4 in accordance with the amount of water contained in the sucked load S. By doing in this way, the moisture content of the load S in the hold 2 can be kept substantially constant, and the fluidity of the cloudy load S can be kept constant. For this reason, the suction of the load S can be continued stably. Even if water supply by the water pump 4 is not performed, if the water content ratio of the load S is kept at a predetermined value, the water pump 4 can be omitted or the operation can be stopped as appropriate. .

  In addition, as the power source 8 of the water pump 4 and the booster pump 5 in this structure, a well-known thing can be suitably employ | adopted besides the motor 8a and the engine 8b. Further, the speed reducer / speed increaser 9 provided along with the booster pump 5 can be omitted as appropriate if unnecessary.

  By constructing an unloading system using the submersible pump 3 as described above, the unloading operation can be performed smoothly regardless of the size of the bulk carrier 1 (the height from the bottom of the hold to the deck). Can do. Moreover, it is not necessary to install a pump station for unloading the bulk carrier 1 permanently or at the port. For this reason, the equipment cost accompanying the installation can be reduced.

1 Bulk Carrier 2 Ship 3 Submersible Pump 4 Water Pump 5 Booster Pump 6 Suction Hose 7 Water Hose 7a Suction Port 7b Discharge Port 8 Power Source 8a Motor 8b Engine 9 Deceleration / Speed Booster 10 Unloader Ship 11 Cooling Water Hose 11a Suction・ Discharge port S Load W Water C Cooling water

Claims (3)

In the unloading system used when unloading the load (S) such as earth and sand loaded on the bulk carrier (1),
The unloader ship (10) includes a submersible pump (3) for sucking the load (S) and a water pump (4) for feeding water (W) to the hold (2) of the bulk carrier (1). The unloader ship (10) is laid sideways on the bulk carrier (1), the submersible pump (3) is installed in the hold (2), and the water pump (4) is used in the hold (2). The water (W) and the load (S) turbid with the water (W) are sucked in by the submersible pump (3) and the load (S) is loaded from the bulk carrier (1). An unloading system characterized by being lowered.   The unloading system according to claim 1, wherein a cooling mechanism is provided in a motor that drives the submersible pump (3).   The unloading system according to claim 1 or 2, further comprising a booster pump (5) for assisting a discharge capacity of the submersible pump (3).

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