Zhongyi Mining Coal Slurry Dryer has made new breakthroughs in the technology to deal with thermal energy loss, which can provide a drying efficiency of 30%. In the complex dryer market, a unique development path has been created to ensure the innovation and improvement of the dryer technology. At present, the dryer has been promoted and applied in Xinjiang, Inner Mongolia and Shanxi, and has been well received by the market. In terms of providing technical research on the efficiency of dryers, Sino-Italian mining engineers have made several optimizations to the slime dryer: strengthening the insulation, adding insulation layers such as glass wool on the steel plates, putting pearl sand in the middle of the jacket, and then externally Galvanized iron sheathing. The equipment removes the screw conveying blade from the feeding end and replaces it with triangular ribs. It can be made of 6mm thick steel plate. The height of the short edge is the same as the height of the feed end retaining ring, and the length is 800mm. The tube is welded firmly, and the distance is 50mm from the weld, and a cone feeder is naturally formed. Its role is to slow the flow of material at high temperatures, and fully absorb heat, improve heat exchange rate, and can reduce the temperature of the front of the dryer to avoid burning the barrel and retaining ring. The unique design of Sino-Italian Mining Machine is in line with the market demand, which is in line with a series of processes in the slime drying production. After the transformation of new technologies, it has solved the low efficiency of the thermal energy utilization of the slime dryer and improved the thermal efficiency. Increase by about 30%. Zhongyi Mining Machinery Co., Ltd. is a research and development production enterprise. At the same time, it listens to the sound of the market, combines powerful research teams, and actively cooperates with the market to develop a new type of practical dryer equipment. In the fierce competition in the market, a firm foothold has been made while striding forward to grow and become an advanced dryer equipment manufacturer in China. Sino-Italy Mining Machine Dryer's excellent quality, environmental protection, energy saving and automatic design have effectively improved production efficiency, saved resources and improved market competitiveness!
Tungsten carbide roller has characteristics of good wear resistance, high temperature red hardness, thermal fatigue resistance and thermal conductivity and high strength , have been widely used in high-speed wire rod, bar, rebar, seamless steel tubes, etc. Domestic production of tungsten carbide roller materials mostly WC- Co, WC- Co- Ni- Cr two series, and the content of Co, Co- Ni - Cr is in the range of 6wt% ~ 30wt%. From the use of perspective, tungsten carbide rollers has good mechanical properties, its flexural strength up to 2200 MPa or more, shock toughness up (4 ~ 6) × 10^6 J/ m^2, Rockwell hardness (HRA) is up to 78 to 90, widely in the high-speed wire rod rolling process, which is much higher than single-slot chilled cast steel or high speed steel rolls.Tungsten carbide is made of Tungsten Carbide Powder and binder phase (such as drilling, nickel, etc.), and then pressing and sintering, regardless of the conditions under cold rolled or hot rolled has excellent wear resistance, tungsten carbide rollers has been widely used in pre-finishing mill and finishing of high-speed wire rod currently. On the performance of tungsten carbide roller in hot-rolling wire rod , the material must meet the following requirements:
Tungsten carbide roller material design
Tungsten carbide roller category
Tungsten carbide roller production process control Carbide Roller,Carbide Ring,Mill of Rolling Line,Steel Wire Rod,Mill Rolling Finish Stand,Mill Roller Groove Type Luoyang Golden Egret Geotools Co., Ltd , https://www.xtchvof.com
1. Sufficient anti-fracture strength;
2. Good abrasion resistance;
3. The smooth surface finish;
4. Excellent corrosion resistance, thermal fatigue, thermal cracking performance.
Tungsten carbide roller rings can working in bad conditions , small profile rolling (especially rebar rolling) process conditions is harsher than the high-speed wire rod, and therefore corresponds to the profile rolling ,tungsten carbide rollers recommend using high binder phase carbide.
Pre-finishing all vehicles roller should ensure its high toughness, strength, rigidity and thermal conductivity, followed before considering its wear resistance. When designing each vehicles roller, pre-finishing materials should choose carbide grades of Co, Co- Ni- Cr binder content is high (greater than or equal to 25wt%) , requiring an average WC grain size of coarse (5μm ~ 6μm), to obtain a higher shock toughness, proper strength and hardness. For the finishing of the roller movements, particularly the last two rollers of the finish rolling, which suffered load is small, and high relative velocity of the material to be pressed (80 m / min ~ 120 m / min). In this case, the wear resistance of the roller to be the most important requirements, and must ensure the strength , timpact toughness and hardness of a reasonable match, so the binder of Co / Ni content ratio and the average grain WC control of particle size and other factors must have greater control in front of different pre-finishing rolling roll.
According to the structure of tungsten carbide rollers, it can be divided into solid tungsten carbide roller and composite tungsten carbide roller. Solid tungsten carbide rollers have been widely used in pre-finishing and finishing stands high speed wire rod mill (including fixed reducing the rack, pinch roller rack). Composite tungsten carbide roller is made of cemented carbide and other materials, and it can be divided into tungsten carbide composite roll rings and solid tungsten carbide Composite Roller. Tungsten carbide composite roll rings mounted on the roller shaft; solid tungsten carbide composite roller will be directly cast in the roll axis to form a whole, a large load is applied to the rolling mill.
Tungsten carbide rollers produced by powder metallurgy method, the key to its process control is the chemical composition of the material and the mixture was prepared, pressed molding, sintering and deep processing and other preparation process parameters.
1. Preparation of starting material (WC focus quality): As the WC raw material and quality control of the use of different levels of quality may fluctuate, resulting in adverse effects on microstructure.
2. Preparation of the mixture: Mixture preparation is the key to the production process of the roller, the roller of failure modes - trachoma, mainly generated by this procedure.
3. Pressing: roller pressing is an important process of the roller mill.
4. Sintering: roller sintering is to determine the final quality of the roller production processes, use of advanced low-pressure sintering technology, HIP sintering technology can greatly improve the performance of roller.
5. Deep processing: deep processing rollers have a greater impact on the quality and accuracy of the roller surface.