Conveyors are widely used in modern industrial enterprises, so the development trend of conveyors has become what we must understand. Now we will briefly introduce you to the advantages of conveyors and the development and application of belt conveyors at home and abroad.
Firstly, Current status of domestic belt conveyor technology
There are many varieties and types of belt conveyors manufactured in China. During the “Eighth Five-Year Plan” period, the technical level of belt conveyors has been greatly improved through the implementation of the national “one thousand tons of fully mechanized mining equipment” project, and the key to high-power and long-distance belt conveyors in underground coal mines. Technological research and new production of Lu has made great progress. For example, the large-angle long-distance belt conveyor complete sets of equipment, high-yield and high-efficiency working surface trough retractable belt conveyors have filled the domestic gap, and carried out theoretical research on the key technologies and main components of the belt conveyor. And product development, developed a variety of soft start and brake devices and PLC-based programmable electronic control device, the drive system uses variable speed fluid coupling and planetary gear reducer.
1 Continue to develop into large-scale. Large-scale includes several aspects such as large conveying capacity, large single machine length and large conveying inclination. The length of the hydraulic conveying device has reached more than 440 kilometers. The length of the belt conveyor is nearly 15 kilometers, and there are several "belt conveyors" that are connected to the two places. Many countries are exploring more perfect transportation of long-distance and large-volume continuous conveying materials. Machine structure.
2 Expand the scope of use of the conveyor. Develop conveyors that can operate in environments with high temperatures, low temperatures, corrosive, radioactive, and flammable materials, as well as materials that can transport hot, explosive, agglomerated, and viscous materials.
3 Make the structure of the conveyor meet the requirements of the single handling of the automatic control of the material handling system. For example, the trolley conveyor of the automatic sorting package used by the post office should be able to meet the requirements of the sorting action.
4 Reducing energy consumption to save energy has become an important aspect of scientific research in the field of transportation technology. The energy consumed to transport 1 ton of material for 1 km has been one of the important indicators for conveyor selection.
5 Reduce the dust, noise and exhaust gas generated by various conveyors during operation.
Second, the status quo of foreign belt conveyor technology
The development of foreign belt conveyor technology is very fast, and its main performance is in two aspects: on the one hand, the belt conveyor has diversified functions and the application range is expanded, such as high-inclined belt conveyor and tubular belt conveyor. Space turning belt conveyors and other models; on the other hand, the belt conveyor itself has a huge development in technology and equipment, especially long-distance, large-capacity, high-speed belts and other large belt conveyors. As the main direction of development, its core technology is to develop and apply the dynamic analysis and monitoring technology of the belt conveyor to improve the running performance and reliability of the belt conveyor. Several typical long-distance belt conveyor conveyor lines that have been used or designed abroad.
1. Spain's Western Sahara belt conveyor line is the longest long-distance conveyor line in the world. The line is 100km long and was built in two and a half years. It was put into use in 1972 and will be used in the rocky plateau area. Cloth. The apatite ore from the Carat Open Mine is transported to the Al Aqin Harbour. The total investment is 200 million marks. The line is expected to last for 30 years, with an average annual traffic of 10 million tons of apatite ore (2000t/h). The entire line consists of 11 belt conveyors with a length of 6.9 to 11.8 km. The bandwidth is l000mm, and the ST3150 steel cord core tape is used, with a belt speed of 4.5 m/s.
2. The 20km ground belt conveyor system of the Qana Mine is a conveying line that represents the development level of modern belt conveyors. The conveyor system consists of a 10.3km long flat belt conveyor and a 10.1km long straight belt conveyor. The turning belt conveyor has a radius of curvature of 9km and an arc length of 4km. The two conveyors have the same parameters except for the line parameters. The transport capacity is 2200t/h, the bandwidth is 1050mm, and the tensile strength of the conveyor belt is 3000N. The safety factor is 5. The tensioning device is tensioned by the weight. The allowable stroke is 25m, and the drive uses three 700KW DC motors and double drum drive. The system uses advanced roller manufacturing and installation techniques, horizontal turning technology and dynamic analysis technology.
3. ZISCO's 15.6km horizontal turning off-road belt conveyor was put into use in 1996. It is the longest belt conveyor in the world. The conveyor transported the secondary crushed iron ore from ZISCO's New Ripple Creek mine to the nearby Zimbabwe steelworks. The conveying capacity is 500t/h for dry ore and 600t/h for wet ore. The total length of the system is 15.6km and the height of material lifting is 90m. In recent years, China has made great progress in the design and manufacture of large-scale belt conveyors.
Since the end of the 1960s, China has produced more than 200 steel cord conveyor belt conveyors, which are used in coal mines, phosphate mines, iron mines and ports. Large-scale belt conveyors with a single machine length of 7602m have been put into use. At present, a number of long-distance belt conveyor systems, including conveyor lines with a total length of l0km, are being designed or planned.