Immediately after entering September, September is the harvest season for vegetables. Potatoes and onions have been harvested. Cabbage, radishes and carrots are all in the concentrated season. The prices of these vegetables have dropped significantly. Farmers can use storage methods first. The storage of vegetables and waiting for the market to be re-listed during the winter season can increase the selling price. Vegetables are still living plants during storage. Under the action of enzymes, they respire and decompose organics to produce starch and sugar, which releases energy. The greater the intensity of respiration, the more substances are consumed and the shorter the storage time is. . Only under conditions of low temperature and high humidity can inhibit the activity of enzymes, reduce respiratory intensity, reduce water evaporation, and extend storage time. Tests have shown that when the temperature of vegetable storage is 5-7°C and the humidity is about 90%, the oxygen content is 3%-5%, the carbon dioxide content is 0.5-2%, and the ozone concentration in the air is 0.01%-0.03%, the longest storage time is. . Storage site can be used 40% formalin 150 ~ 200 times evenly spray disinfection. For example, Changjiang Village, Ning'an Town, Ning'an City, Heilongjiang Province is a vegetable production specialty village. The vegetables grown in their village are mainly supplied to Ning'an, Wenchun, Mudanjiang and other places, and they are sold with production. The villagers built a vegetable cellar in their own home, stored the vegetables in the fall, sold them outside during the winter, and sold during the off-peak season in peak seasons.
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.