The efficient and environmental protection weapon for port bulk cargo operation
Screw type continuous ship unloader is an efficient continuous ship unloader which uses the mechanical rotation of screw mechanism to lift and transport materials to the rear wharf. The screw ship unloader is mainly composed of vertical arm, horizontal arm, rotating tower, end screw conveyor and gantry. The vertical arm includes box cover and vertical screw conveyor. The vertical screw conveyor is composed of inner screw and outer screw. The inner screw is used to lift materials vertically and the outer screw is used to loosen and supply materials. The horizontal arm consists of two parts: box boom and horizontal screw conveyor.
When unloading, the reverse spiral feeding device is lowered into the material to be unloaded. The material is pushed down under the action of the forward spiral in the feeding device, and then pushed from the material picking screw to the center lifting reverse screw. The reverse screw will transport the material to the spiral lifting pipe, and then the inner screw will lift the material vertically, and then the material is transported to the predetermined connection through the horizontal conveyor Material department.
Advantages: light structure, completely sealed, good performance, can better prevent dust leakage and noise pollution, easy to operate, low labor intensity of field personnel, more suitable for less mobile materials (such as agglomerated materials) unloading, compared with the same productivity unloading, its weight is the lightest. It is used in many foreign countries, such as Belgium, Saudi Arabia, the United States and the Netherlands. Domestic ports include Guangzhou Xinsha port, Rizhao Port, Formosa Plastics Group power plant, Hainan Jinhai Pulp and paper power plant, Liyang steel plant and Huaneng Yueyang Dianguang.
Operation capacity of screw type continuous ship unloader:
The quota efficiency ranges from 100t / h to 2700t / h, which meets the needs of bulk cargo operation of ports along the river and coastal areas.
High efficiency of ship unloading: it is mainly manifested in the high filling coefficient of the materials in the spiral conveying pipeline, which is often close to the full load condition. Due to the installation of a unique feeding device (reverse reclaiming screw head), the filling coefficient can be as high as 70 ~ 90%; Secondly, the screw machine can often work close to full load: its vertical arm can rise, fall and swing with the boom's pitch, and can rotate 100 degrees with the rotating tower. With the traveling function of the ship unloader, the reclaimer head can reach all corners of the warehouse flexibly, so it can realize continuous ship unloading operation. Its average productivity utilization coefficient is 75%, and it can reach 95% when unloading cement. The remaining material is about 20-30cm, and the clearance capacity is small. The actual amount of material to be discharged by the pusher raker only accounts for less than 5% of the total amount of hatch loading, while the amount of material to be discharged by the grab ship unloader is about 50%, so under the same rated unloading efficiency condition, The actual capacity of the screw unloader is about 20% larger than that of the grab unloader, and the average efficiency coefficient of the ship unloading operation can reach 75%, while that of the bridge grab unloader is only 50% - 60%. This stable nature of work can reduce the configuration capacity of the rear conveyor system, which can also reduce costs.
Due to its high degree of intelligence, the software and hardware of the electrical PLC control system of the screw type continuous ship unloader adopt the products of famous companies. PLC control can realize the functions of equipment control, data monitoring, data processing and data transmission, and display the working status, loading and unloading data and fault information in the electrical room, cab and central control room of the system, so as to realize the information management of loading and unloading system. According to the actual demand, each mechanism can put forward AC frequency conversion, DC, hydraulic control scheme for users to choose. The operation is simple, easy to realize automatic operation, and can greatly reduce the number of wharf operators.
Because the vertical arm reclaiming device and the horizontal arm conveying structure are all closed, and the rear discharge point adopts an independent dust-proof aggregate system, so there is no pollution, leakage and dust in the whole process, which can reduce the dust pollution of wharf unloading operation by 90%. The grab ship unloader is easy to cause dust flying at the grab out of the warehouse, in the air, and at the grab discharge. Now the country's requirements for environmental protection are higher and higher, and the pressure of environmental protection is very large. The screw ship unloader is very in line with the government's requirements for environmental protection.
Energy saving of screw type continuous ship unloader:
The power consumption of screw type continuous ship unloader is about 70% of that of grab ship unloader due to no frequent acceleration and deceleration and start-up and braking, and the fuel consumption of Bunker Cleaner is about 30% of that of grab ship unloader. Nowadays, small wheeled push harrow machines are widely used, and some of them are driven by electricity. In addition, the noise during operation is also small, and the sound level can be controlled below 55dB (a).
Maintenance cost of screw type continuous ship unloader:
The vulnerable parts of vertical screw ship unloader are seals and wear parts, which need lubricating oil all year round. The average annual maintenance cost of each vertical screw unloader is within 2% of the total equipment price. The weight of the screw type continuous ship unloader is light, which can reduce the capital construction cost of the wharf.