CN1117465A

CN1117465A - Two-step ship unloading method for large amount bulk cargo

Info

Publication number: CN1117465A
Application number: CN 95104936
Authority: CN
Inventors: 关立旗
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-05-12
Filing date: 1995-05-12
Publication date: 1996-02-28

Abstract

The discharge method involves following steps: first step: discharging the bulk cargo (ore or coal) from ship's hold onto a barge under the gravitation; second step: using continuous mechanical conveying system to bring the cargo from barge to land. Advantage: large capacity, low cost.

Description

Two-step ship unloading method for large amount bulk cargo

The present invention relates to a kind of method of unloading a ship, particularly two-step ship unloading method that delivers the capsize vessel oceangoing ship of ore or coal.

The method of unloading a ship of the boats and ships of known delivery ore or coal major bulks except that self discharging ship, adopts grab bucket ship unloader or mechanical type continuous ship discharging machine to carry out work usually, grab bucket ship unloader has many advantages, but still exist and to remain improved place, subject matter is: practical efficiency is lower, can not thoroughly clear the ship, produce a large amount of dusts, material has leakage loss, and because of collision easy damaged hull and grab bucket, operative technique requires high, labour intensity is big, and the ship type is bigger to the grab bucket effectiveness affects; Though the mechanical type continuous ship discharging machine is through development for many years, not success fully as yet particularly is used in to rise on the seagoing vessel and unloads ore or coal so far, and effect is relatively poor.The improvement method and apparatus of unloading a ship, improve ship-discharging operation efficient, be one of current development seat transport problem that already need solve, the comprehensive survey of this respect can be consulted the article " the patent development summary of major bulks continuous ship discharging machine " on the second edition in " Chinese patent newspaper " on May 26th, 1993.

The objective of the invention is to develop a kind of new method of unloading a ship, further improve the ship-discharging operation efficient of the large ship of delivery ore or coal, adapt to the needs of boats and ships maximization back ship-discharging operation better.

The object of the present invention is achieved like this, the boats and ships of delivery ore or coal are behind the port, can carry out unloading operation by following two-step method: the first step, utilize action of gravity, earlier ore or coal are leaked on the ship of unloading that sinks under the water in advance by the bilge door that is arranged on the cargo hold bottom; Second step emerged the ship of unloading, and the alongside harbour is with bucket wheel ship unloaders or bucket unloader, again on the material unloading delivery system ashore on the ship of unloading.

Prior art can be made opening in the cargo hold bottom, and install bottom door additional, and can make it in the ship process, keep good closed condition,, technically realize this requirement well downwards as the taper mud door of opening that adopts on some dredger, the dull and stereotyped mud door of radial type.Keel block and abutment pier on the dock bottom are removed in existing some floating drydock, after two ends install Non-watertight Door additional, can repack the needed ship of unloading of two-step ship unloading method into.In a word, the large ship of delivery ore or coal adopts the two-step method unloading, and the technical equipment aspect can realize fully.

In delivery ore or coal large ship ship-discharging operation scope, compare with known method of unloading a ship, two-step method has very high ship-discharging operation efficient, can shorten anchorage period for ship greatly, the turnover of acceleration boats and ships, can further reduce these traffic cost and expenses of unloading a ship of commodity at a low price, produce favorable social and economic benefits.

Fig. 1 uses the work scheme drawing of two-step method unloading for boats and ships.

The present invention is further illustrated below in conjunction with embodiment and accompanying drawing.Under the enough situations of the wharf apron depth of water, whole unloading process is all carried out in the wharf apron.The freighter 1 of delivery ore or coal makes it sail ship 3 tops of unloading to the sinking certain depth of pouring water behind the port, and corresponding up and down with it, opens the bottom door 2 of one or two cargo hold, makes ore or coal in the cargo hold leak into ship 3 the insides of unloading.After leaking end-of-job, close corresponding cargo hold bottom door immediately, take out water inlet in the cabin, continue simultaneously ore in other cargo holds or coal are all leaked on the ship 3 of unloading.After first step operation is finished, remove freighter 1, get rid of the ballast water in the ship 3 of unloading, make its come-up, behind the alongside harbour, use mechanical type continuous ship discharging machines such as bucket wheel ship unloaders, bucket unloader or stretched wire bucket ship unloaders, again on the material unloading delivery system ashore on the ship 3 of unloading.

If the wharf apron depth of water is more shallow, and the greatly more direct alongside harbour of the tonnage of freighter 1 at this moment, can make the first step operation in the two-step method, carries out in the abyssal zone that casts off wharf, and then the used ship 3 of unloading is towed back to, and behind the alongside harbour, carries out second again and goes on foot operation.This limits the difficulty that causes very favourable to overcoming because of the harbour depth of water.Like this, use two-step method to unload a ship, even the very big boats and ships of tonnage also can be discharged to the ore or the coal of hundreds of thousands of ton on the shallow draft quay.

Claims

1. method of unloading a ship that delivers the major bulks ship of ore or coal, it is characterized in that: the process of unloading a ship is carried out in two steps, the first step, freighter (1) is sailed the ship of unloading (3) top that sinks under the water to water filling, and it is corresponding up and down with it, open cargo hold bottom door (2), ore or coal are leaked on the ship of unloading (3) by cargo hold, second step, get rid of the ballast water in the ship (3) of unloading, make its come-up, behind the alongside harbour, with mechanical type continuous ship discharging machine will unload ore or coal on the ship (3), on the unloading delivery system ashore.