Originally, because of land acquisition, crop stubble and other reasons, the greenhouse can not be reused, while the assembled greenhouse with built-in insulation can be moved, so it is easy to handle. The greenhouse adopts a component assembly structure, and components such as V-shaped keel, composite beam connector, cavity bag insulation quilt material and laminated quilt mechanical system are completely produced by industrial assembly line, which is convenient to build and disassemble. The greenhouse can be moved, which is convenient to change the direction of land use and can solve the problems of soil salinization and greenhouse crop rotation. At the same time, it is beneficial to the large-scale and industrialized operation of greenhouse industry.
Good light reception: heat preservation
Because the cross section of the greenhouse keel is V-shaped, the film pressing line is pressed in the V-shaped notch, and the film is closely matched with the keel, so that the plastic film on the surface of the greenhouse is flat, and the daylighting rate is more than 30% higher than that of the traditional greenhouse. Under the same lighting conditions, the indoor temperature is about 5℃ higher than that of the traditional greenhouse. The film dripped smoothly, avoiding the phenomenon that the traditional greenhouse dripped along the film pressing line and injured the seedlings.
In a traditional greenhouse, the film is covered with a straw curtain and a quilt. In the new greenhouse, the insulation is placed in a plastic film and runs up and down along the radian of the keel. There is a certain distance between the insulation quilt and the film, so that the insulation quilt does not contact with the plastic film, which will not damage the film and prolong the service life of the film; The film is exposed on the surface, and the rain and snow naturally slide down, which avoids the trouble of cleaning the snow and drying the grass, and avoids the phenomenon that the thermal insulation performance is reduced in rainy and snowy weather; The film and the inner surface of the insulation quilt keep a certain humidity, which has strong flame retardancy and can also avoid greenhouse fires.
The temperature and humidity of the assembled greenhouse with internal insulation are adjusted by means of heat preservation and cooling, gable window convection ventilation and film convection ventilation. The insulation quilt alternately opens and closes against the sun for lighting and insulation, which prolongs the lighting time of the greenhouse; Alternately opening and closing the insulation quilt away from the sun will shade and cool down, and the cooling speed will be fast. In arid areas, using heat preservation to cool down can reduce the water consumption in greenhouses and save water resources.
Suitable for national conditions: low cost
Professor Jiang Jinbiao told the reporter that there are mainly two kinds of greenhouses: solar greenhouse and multi-span greenhouse, and the assembled greenhouse with internal insulation is a form between the two. Multi-span greenhouse is not suitable for farmers because of its high cost and complicated operation. "Assembled greenhouse with internal insulation" is a provincial scientific research project applied by Liaoning Agricultural Vocational and Technical College. Since 200 1, it has obtained three national patents and has independent intellectual property rights. Assembled greenhouse with internal insulation has distinct characteristics and advantages in modernization, low cost, performance, construction and use, which meets the needs of China's national conditions.
The thermal insulation effect of cavity bag (hollow) quilt made of polymer photosensitive composite material is the same as that of double-layer grass. Compared with the traditional brick wall and steel frame greenhouse, the hollow bag insulation quilt is light in weight, which reduces the load of greenhouse construction, saves building materials and reduces the construction cost by about 30%. In summer, the insulation is sealed at the upper end of the greenhouse, and the film is rolled to the top of the greenhouse for sealing, which relatively prolongs the service life and reduces the use cost.
Because the insulation quilt is very light, the staff in the greenhouse demonstrated to reporters that one person can easily cover the insulation quilt with a hand-operated device. Two sets of laminators are set up to control the thermal insulation quilts on two slopes respectively, and it takes 3-4 minutes to finish laminating or covering the quilts with one hand. Manual machinery does not need electric energy, adapts to remote plots, saves energy and avoids the damage of traditional greenhouse louver machinery.
A greenhouse with a facility area of one mu usually covers an area of 1.5 mu to 2 mu, while an assembled greenhouse with internal insulation covers an area of almost one mu, which can save a lot of cultivated land. In recent years, Liaoning Province has built about 800,000 mu of protective agriculture every year. If this new greenhouse is used, hundreds of thousands of acres of cultivated land will be saved. At present, there are more than 4 million mu of solar greenhouses in Liaoning, some of which have been updated one after another. The new greenhouse is a good substitute. Moreover, it is labor-saving and labor-saving to build an internal insulation assembly type. A greenhouse like this can be built in less than a week, while a traditional sunlight greenhouse takes more than a month. The reporter learned that some farmers and enterprises have visited the model room and reached a preliminary cooperation intention, which laid the foundation for the in-depth research and promotion of the project.
Northern greenhouse network