The piston is one of the main moving parts of the
engine, is composed of combustion chamber components. Engine Piston Parts,Engine Parts ,Car Engine Parts,Parts Of Engine,Piston Engine Parts ZhouShan HeCheng Machinery Co., LTD. , https://www.hcmarineparts.com
The pressure of the gas
piston through the connecting rod to the crankshaft, realize the change from
heat energy to mechanical energy.
The work condition is very bad, and the
temperature of 1400-1800 DEG C, and pressure
Up to 13MPa above the gas
contact, greatly alternating thermal stress and mechanical stress.
And by the
serious corrosion of gas, and under the condition of boundary lubrication and
cylinder wall friction and strong impact 1 times.
The piston in high
temperature, high pressure, strong corrosive gas contact so that it has enough
strength and hardness,
Heat resistance and good thermal resistance, high
fatigue strength and corrosion resistance. For high speed diesel Engine Piston
also requires light as far as possible.
In order to reduce the inertia
force.
Marine piston large low speed diesel engine of the crosshead is
usually combined.
The heat treatment process by normalizing and annealing,
and iron pearlite are ferrite organization, has good heat resistance.
Piston
alloy quenched and tempered steel has better heat resistance and corrosion
resistance. The skirt with nodular cast iron annealing treatment, with good wear
resistance.
Broccoli High Yield Cultivation Techniques in Summer and Autumn
First, the choice of varieties Summer and autumn planted broccoli should choose strong varieties with good adaptability and high yield, such as green, Tokyo green, green and so on. Second, the cultivation of seedlings for age-appropriate seedlings from June to September, seedling age in 25 to 30 days. Seedlings are planted when the first true leaves of the seedlings are unfolded, and colonized when the true leaves are 4 to 6 pieces. Third, site preparation, planting and selection of strong water retention, rich in organic matter, high ground, well-drained land, after the cultivator squat. Each mu of cooked manure and other organic manure 2000 kilograms, compound fertilizer 33 kilograms as the base fertilizer, and then for sorghum, sorghum width 1.3 to 1.5 meters (bag ditch), from a small high ridge height of 15 cm. Double-row planting, spacing 50-60 cm, plant spacing 40-50 cm, planting about 2000 per acre. Fourth, field management 1? Fertilizer and water management: When planting, the rooting water should be sprayed. After the transplant, the water should be continuously sprayed 2 or 3 times in case of high temperature and sunny weather. After live planting, fertilizer is applied in a timely manner. The main measures are: 15 days after planting, combined with thin soil peanut bran water 15 days after planting, budding, after application of thin peanut bran water and 30 kg of Mushi compound fertilizer, after top flower ball harvesting per acre Topdressing 15 kg of compound fertilizer. Keep the soil moist throughout the growing season, timely drainage in the rainy season to prevent flood damage; in the dry season, especially in the development of the flower buds, more water is needed, and timely watering or irrigation. 2? Pest control: The main broccoli diseases are blight and downy mildew. The pests mainly include cabbage caterpillar and diamondback moth. Blight can be treated with 5% Jinggangmycin 1500 times spray; downy mildew can be sprayed with 64% antitoxic WP 500 times, or 58% metalaxyl MnZn wettable powder 500 times. Pieris rapae, Plutella xylostella can be used net 800 times solution of three moths, or 5% Rui Jin Su suspension agent 50 ~ 100 ml, or spray with 10% cypermethrin 3000 ~ 4000 times liquid control.