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Recently, Jiangsu Tianming Machinery Group developed the "SGZ1000/3x1000 AC variable-frequency dragging scraper conveyor complete sets of technical equipment" and "SGZ900/2x1000 frequency conversion driven top-loading coal (front and rear) complete sets of technical equipment " (less than two equipment Referred to as "frequency conversion scraper conveyor" in Inner Mongolia Erdos Shenhua Shendong Coal Group passed the national technology appraisal. The appraisal committee has determined that the two technical equipments have reached the international advanced level as a whole, one can replace imported products, and one has filled the gap.
The two equipments of the “inverter scraper conveyor†are the most critical equipment in the modern mechanized coal mining process for large-scale coal mines. The high-end equipment of this type was previously mainly imported. Major technologies such as heavy-duty scraper conveyor heavy-duty soft start, high reliability long-lived middle tank manufacturing, on-line real-time monitoring and feedback of the entire machine have been monopolized by European and American giants, and coal companies in China can only spend huge sums to purchase, price and supply. The cycle is completely controlled by foreign companies. In addition, there are still drawbacks such as high maintenance costs and sluggish response to after-sales services. Our country has always been subject to control by people.
Experts of the appraisal committee stated that the “Inverter Scraper Conveyor†developed by the Tianming Group achieved major technological breakthroughs in the application of frequency conversion technology, automatic chemical condition monitoring, and key component manufacturing technologies. Among them, the application of frequency conversion technology has an epoch-making significance for the development of our scraper conveyor. The working conditions of the fully mechanized coal mining face are severe and are limited by the power grid capacity and space conditions. The problems of heavy load and full load start of the scraper conveyor have been difficult to solve effectively. "Inverter Scraper Conveyor" adopts AC explosion-proof frequency conversion technology to achieve constant torque soft start under full load conditions, multi-motor power balance, and adjust the operating speed with load changes, effectively reduce energy consumption and improve equipment life. Scraper conveyor operating condition monitoring and control technology is another major achievement, achieving high torque mechanical overload and intelligent electrical protection, control system with self-diagnostic function, historical data storage. This technology establishes a technical support platform for the realization of an unmanned fully automatic working surface. In addition, the use of the central slot casting and welding process with independent intellectual property rights improves the reliability and wear resistance of the equipment.
High temperature alloy is divided into three kinds of material: 760 ℃ high-temperature material, 1200℃ high temperature and 1500 ℃ high temperature materials, the tensile strength is 800 mpa. On other words,it refers to the metal material worked well in the condition of 760-1500 ℃ or above. It owns excellent high temperature strength, good resistance to oxidation and thermal corrosion resistance, good fatigue properties, fracture toughness and other comprehensive performance, this kind of material has became an irreplaceable key material in military and civilian gas turbine engine hot end components . According to the relevant theory, 760 ℃ high-temperature materials, according to the matrix elements,can be mainly divided into high temperature iron base alloy, nickel base superalloy and cobalt-based super alloy. According to the preparation process,it can be divided into deformation and high temperature alloy, casting high temperature alloy and powder metallurgy super alloy. According to the solid methods,it can be divided into solid solution strengthening, precipitation strengthening and oxide dispersion strengthened with fiber reinforced type, etc.
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