In January 26, 2008, a technician walked past the WK-55 excavator. This is the latest development of Taiyuan heavy industry large open-pit mining equipment, weighing 1458 tons, height more than seven stories, a single machine can excavate 12 million cubic meters of coal each year. Workers standing in front of it can only reach half of the height of the track.
In January 26, 2008, Shanxi Taiyuan heavy industry Limited by Share Ltd, developed by the WK-55 type mine electric shovel shipped out of the factory, used in the Shanxi Pingshuo open coal mine surface stripping operation. This is the largest mining shovel in the world and the key equipment in the construction of large open-pit mines in China. At present, the world can independently develop more than 55 cubic meters of giant shovel enterprises, only Taiyuan heavy industries, the United States P&H company and Los three.
The mine electric shovel is a power driven excavator. According to the bucket capacity, the small electric shovel below 1m, the medium shovel below the 5m, the heavy shovel below the 15m and the giant shovel above the 15m, and the walking device is mostly tracked. The electric shovel is mainly used in the large open pit mining for stripping the surface soil and mining the earth and rock in the mining area. Shallow coal mines, iron ores, and copper and aluminum nonferrous metal mines are mostly used in open air mining. But before mining, it is necessary to strip off the soil or rock covered by the orebody. Some mining areas cover more than 100 meters of thickness, and the amount of earth and rock needed to be stripped can reach tens of millions or even billions of cubic meters. This requires hundreds of thousands of tons of explosives to be used for blasting or partial blasting. Then the stripping operation is carried out with giant shovel and loading vehicle. A straight and long overburden layer is dug through the electric shovel to expose the coal seam. After the excavation is completed, second stripped strips are opened, and the shovel will fill the excavated overburden into the first tunnel. Because the stripping workload is very large, far from the ordinary excavator and vehicle can be competent, this prompted the machinery enterprises to develop: shovel capacity 50m above the shovel, pull shovel and other giant excavators, and the load of more than 350 tons of mining cars. These giant machines, with their amazing performance, have become a wonder in the history of human machine development.
The WK-55 type mine electric shovel developed by Taiyuan heavy industry is 1265 tons of net weight and 1458 tons of working weight. It is equivalent to 30 heavy tanks. The height of the whole machine is 22 meters, equivalent to 7 storey buildings, only 2 meters high in the single track. The total installed power is 4850 kilowatts, which is equivalent to 50 Poussin cars; the bucket design capacity is 36-76m, the standard capacity is 55 cubic meters, the theoretical excavation per hour is 6600 cubic meters, and the design excavation is 1 million 30 thousand cubic meters per month. This giant excavator, with a shovel, can dig up hundreds of tons of earth and stone, and the earth is filled with a football field every day, enough to exceed the height of three floors. Every WK-55 excavator can excavate the earth volume of Hangzhou West Lake one year. Compared with people's daily excavators, the capacity of the ordinary hydraulic crawler excavator is less than 5m, the weight of the whole machine is only 100 tons, and the power is only a few hundred kilowatts, so how huge is the giant electric shovel.
The Big Macs are composed of tens of thousands of parts, the car body is a giant caterpillar chassis, and the upper body is equipped with a host room, a cab, a hoist arm, a bucket rod, a bucket, a A support, a hoist, a generator and so on. It is like a building that can be rotated, and is connected to a crawler chassis through a huge round return platform. When the early excavators work, they are driven by electric power, and input to tens of thousands of volts alternating current through external cables. The powerful current drives the AC motor, and then drives the DC generator to generate electricity, which provides energy for the DC motor that drives the crawler walking, the turning on the car, the hoisting and pushing of the bucket. With the development of technology, the DC control system is gradually replaced by thyristor converter power supply system and AC variable frequency motor and its control system. The early shovel needs three crew members, one operator, one responsible for fuel injection and cleaning, a ground worker, responsible for power supply cables and cleaning face. Staff need to go through a long staircase to enter several storey cab.
When the electric shovel works, use the giant bucket which is connected to the bucket, excavate the earth and stone on the working face, lift the bucket, turn the hoist arm to the unloading position, open the bolt at the bottom of the bucket, dump the earth and stone to the loading vehicle, and then turn the crane arm to the working face and complete a working cycle. The large tonnage mine truck equipped with electric shovel is 180-360 wheeled in the world. It is the largest wheeled vehicle in the world, and has a height of 3 meters per light. For a long time, China's mining machinery has been relying on high price imports. The domestic mining machinery developed by Taiyuan heavy industry and other enterprises has saved a large number of equipment import costs and operating costs for China's energy industry projects.
