Although the application of solar insect killer lamps in various regions is showing a trend of increasing year by year, but everyone's understanding of it is mostly concentrated in the solar power supply, insect trapping, etc., and its performance in various aspects is not yet too well understood. For deeper analysis, the solar lamp product definition is mainly the following three points.
1. Trapping and killing pests and equipment as a new type of weapon that replaces pesticides and insecticides. Solar insecticidal lamps must shoulder the heavy burden of field pest control. Therefore, the first definition of solar insecticidal lamp products is to trap and kill pests and equipment. Light habits, the use of specific bands of spectrum traps to kill pests, can significantly reduce the pest index, and effectively control insect pests and insect-borne diseases.
2. Economic and environmental protection equipment The development of society and economy has made people's demands for quality of life higher and higher. Green environmental protection is getting more and more attention. Therefore, the development of agriculture also needs to meet this goal. It needs to be exempted from agricultural production. With less use of chemical pesticides, physical pest control equipment such as solar insect killer lamps will not cause environmental pollution while trapping and killing insect pests. It is the preferred equipment for high-quality, high-yield agricultural products and can improve agricultural economic benefits. Therefore, the first definition of solar insect light products is economic and environmental protection equipment.
3. Assisted breeding equipment Pesticide-killed pests are also highly toxic and therefore cannot be fed feed for fish, livestock, poultry and other insectivorous animals, while modern agriculture emphasizes the combination of planting and breeding, so solar-powered insecticidal lamps The third product definition is assisted breeding equipment. The high-protein insect feeds collected by solar insect killer lamps are natural, safe and non-polluting and can be used to feed fish, livestock, poultry and other insectivorous animals. This will not only reduce protein feed costs, but also improve product quality. .
The above is the product definition of solar insect killer lamps. Through practical application, it also shows that the application of solar insect killer lamps really meets the requirements and goals of safety, energy saving, environmental protection, and effectiveness. Once investment, long-term benefit, it is already in the efficient vegetable base. , pollution-free orchards, chicken farms, high-end villas, organic tea plants, wetland parks and other fields have been widely used.
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:
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.
Tungsten carbide roller material design
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.
Tungsten carbide roller category
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 roller production process control
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.
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