Greenhouse skeleton simple production technology
Characteristic agriculture depends on greenhouses. The main material of the greenhouse, the skeleton, has always restricted the development of greenhouses. The cost of bamboo, steel, and cement used in traditional greenhouses is 6,000 to 10,000 yuan per 667 square meters. The pillars in greenhouses have a severe impact on the operation and lighting of the shed. The service life is only 2-10 years. Due to its own limitations, traditional greenhouses have low thermal efficiency and poor lighting and thermal insulation. The skeleton produced by the application of this technology integrates the toughness of bamboo, the strength of steel bars, and the moisture-proof and anti-corrosion properties of plastics. The service life is 20-30 years. Skeleton radian is more than 2.5 meters above the ridge and spans 8 meters to 16 meters. There are no pillars in the greenhouse for farming on various machines. The overall cost of producing the skeleton is 1.30 yuan per meter. Take a greenhouse with a span of 8 meters and a length of 84 meters as an example, 84 skeletons with a length of 10 meters are required, with a total cost of 1,092 yuan; plus the consumables such as agricultural film, the total investment is also Will not exceed 3,000 yuan. Compared with a reinforced concrete shed that can be used for 10 years, at least 5,000 yuan can be saved. Although there are manufacturers that manufacture pillarless greenhouses, it is unbearable for ordinary farmers to invest 10,000 yuan to 20,000 yuan to purchase skeleton machines. The following describes a simple technique that can produce inorganic composite greenhouses without the need for machines. First, self-made molds. To the building materials market to buy high-quality PVC plastic pipe diameter 4-6 cm, length custom. Saw the tube longitudinally with a saw. The PVC pipe can bend, just adapting to the required arc. To maintain the required curvature after casting in the mold, an outer formwork must be made. Outer formwork can be made of wood or steel. As long as the mold can be fixed to a certain degree of curvature can be. Second, the raw material formula. Magnesium chloride 30%, magnesium oxide 50%, talc 13%, sulfuric acid 0.5%, triethanolamine, toluene 0.1%, ferrous sulfate 0.3%, oxalic acid (for pH adjustment), trisodium phosphate, formaldehyde 1%, B Diamine 0.03%, phenol 0.02%, glass fiber filament 2.95%. If the above formula is too cumbersome, only the first three kinds of fiberglass filaments may be used; the purpose of adding other chemical raw materials is to enhance the strength of the product at a later stage, pull strength, and prevent powdering. Release agent formula: one of polyvinyl alcohol, butter, and concentrated soap. Third, tool materials. Brushes, plastic scoops, vibrators, wood molds (or rebar molds), etc. Fourth, the production process 1, the mold is fixed on the mold rack, and brushing uniform release agent. 2. Fiberglass filaments are drawn from one end of the die to the other so that the filaments are evenly distributed in the die slots. 3. Add the appropriate amount of water after the main ingredients are mixed, and mix into a paste of toothpaste. Test the pH with a test strip, preferably 7-8 pH. If it is too high, add appropriate amount of oxalic acid to adjust. 4, the main material with a plastic scoop in the mold little by little to fill in, while gently pulling the glass fiber filaments, so that the distribution of fiber filaments in the center of the mold. 5. The vibrating bar must be started at the same time when filling and drawing, gently vibrating, so that the main material can be densely filled in the mold to minimize bubbles. 6. After the mold is fully filled with the main material, the mold can be placed in a horizontal place (cannot be flooded), and the mold can be peeled off after being naturally maintained and dried for 7 days. A skeleton with the ideal curvature of the greenhouse was made.
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