The technique of growing vegetables in greenhouses is widely used. During the cultivation of greenhouses, strict control is required on the temperature, humidity and light intensity in greenhouses, so as to ensure the growth and quality of vegetables. Because the most suitable temperature for crop production is generally 20~30°C during the day, nighttime temperature is 10~20°C, growth above 5°C and below 40°C is inhibited, and some crops require high temperature, such as watermelon and melon, and the required temperature during the day is 25 ~30°C. The growth ceased at 10°C and the freezing injury occurred at 5°C. For this reason, accurate analysis of factors such as temperature, humidity, and humidity in the greenhouse is needed to obtain the corresponding measures. This requires the use of a self-reporting thermometer and hygrometer so that accurate temperature and humidity can be obtained and measures can be implemented.
Through the monitoring and analysis of the temperature in the greenhouse through a self-reporting thermometer and hygrometer, the usual multiple-coverage cultivation techniques are commonly used in winter production: covering the ground with a plastic film; covering the straw film with a straw, and adding a layer of plastic on the straw curtain. film. In case of strong cooling weather, temporary heating measures shall be adopted: more coal cakes and stoves shall be set up in the shed to warm up, and conditions may be used to warm the equipment such as electric heating lines and diesel heaters. In summer, the temperature in the shed is very high. All the ventilation II around the greenhouse must be opened. If the temperature is too high, the top of the greenhouse can cover the shade net to cool down. In sunny weather during the day, timely measure the temperature in the shed. Once the temperature rises above 30°C, immediately open the ventilation on both sides of the ventilation area II, adjust the ventilation II, and try to keep the temperature in the shed stable at 25~30°C. To increase the light, increase the light intensity and extend the lighting time: Select the agricultural film with high light transmittance, and clean the agricultural film to ensure the cleanness of the agricultural film; cover the white plastic film; hang the reflective curtain on the back wall; Field light transmission.
The self-reporting thermometer and hygrometer monitors the humidity in the greenhouse and regulates the air humidity in the greenhouse. It minimizes watering during the growing season, prevents watering during the growing season, lowers the ground temperature, and increases air humidity. Watering, can open ditch irrigation small water, avoid flood irrigation. 2 Covers no drip film; the upper part of the shed is filled with water, and plastic hoses are laid under the mulch to spray irrigation, and drip irrigation facilities can be used if necessary. 3 Try to use large and small rows. After the watering, timely cultivating and loosening. Under the premise of ensuring the proper temperature, timely ventilation and discharge of moisture; cold season watering, should be selected in the sunny morning. Immediately after the watering, the enclosure was sealed and the temperature was increased. Wait until noon and afternoon to increase ventilation and remove moisture. Through the above measures, the air humidity in the shed can be greatly reduced.
The self-reporting temperature and humidity meter is very accurate in monitoring the temperature and humidity in the greenhouse. Therefore, the measures taken to control temperature and humidity are very scientific, so that the growth and development of indoor crops can be guaranteed and the economic benefits of planting can be guaranteed. And to ensure the quality of the crop.
Through the monitoring and analysis of the temperature in the greenhouse through a self-reporting thermometer and hygrometer, the usual multiple-coverage cultivation techniques are commonly used in winter production: covering the ground with a plastic film; covering the straw film with a straw, and adding a layer of plastic on the straw curtain. film. In case of strong cooling weather, temporary heating measures shall be adopted: more coal cakes and stoves shall be set up in the shed to warm up, and conditions may be used to warm the equipment such as electric heating lines and diesel heaters. In summer, the temperature in the shed is very high. All the ventilation II around the greenhouse must be opened. If the temperature is too high, the top of the greenhouse can cover the shade net to cool down. In sunny weather during the day, timely measure the temperature in the shed. Once the temperature rises above 30°C, immediately open the ventilation on both sides of the ventilation area II, adjust the ventilation II, and try to keep the temperature in the shed stable at 25~30°C. To increase the light, increase the light intensity and extend the lighting time: Select the agricultural film with high light transmittance, and clean the agricultural film to ensure the cleanness of the agricultural film; cover the white plastic film; hang the reflective curtain on the back wall; Field light transmission.
The self-reporting thermometer and hygrometer monitors the humidity in the greenhouse and regulates the air humidity in the greenhouse. It minimizes watering during the growing season, prevents watering during the growing season, lowers the ground temperature, and increases air humidity. Watering, can open ditch irrigation small water, avoid flood irrigation. 2 Covers no drip film; the upper part of the shed is filled with water, and plastic hoses are laid under the mulch to spray irrigation, and drip irrigation facilities can be used if necessary. 3 Try to use large and small rows. After the watering, timely cultivating and loosening. Under the premise of ensuring the proper temperature, timely ventilation and discharge of moisture; cold season watering, should be selected in the sunny morning. Immediately after the watering, the enclosure was sealed and the temperature was increased. Wait until noon and afternoon to increase ventilation and remove moisture. Through the above measures, the air humidity in the shed can be greatly reduced.
The self-reporting temperature and humidity meter is very accurate in monitoring the temperature and humidity in the greenhouse. Therefore, the measures taken to control temperature and humidity are very scientific, so that the growth and development of indoor crops can be guaranteed and the economic benefits of planting can be guaranteed. And to ensure the quality of the crop.
The role of the valve is specifically responsible for the input of air into the engine and exhaust the exhaust gas after combustion. From the engine structure, it is divided into intake valve and Exhaust Valve.
The role of the intake valve is to draw air into the engine and mix it with the fuel to burn; The function of the exhaust valve is to discharge the exhaust gas after combustion and dissipate heat.
The valve is composed of a valve head and a rod. The valve head temperature is very high (intake valve 570~670K, exhaust valve 1050~1200K), but also withstand the pressure of the gas, the valve spring force and the transmission component inertia force, its lubrication, cooling conditions are poor, requiring the valve must have a certain strength, stiffness, heat and wear resistance.
The intake valve is generally made of alloy steel (chromium steel, nickel-chromium steel), and the exhaust valve is made of heat-resistant alloy (silicon chromium steel).
Sometimes in order to save heat resistant alloy, the exhaust valve head is made of heat resistant alloy, and the rod is made of chromium steel, and then the two are welded together.
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