PVC pipe is extruded by hot pressing method after the cooperation of PVC resin, stabilizer and lubricant. It is the earliest plastic pipe developed and applied.
PVC-U pipe has strong corrosion resistance, easy adhesion, low price and hard texture. However, due to the leakage of PVC-U monomer and additives, it is only suitable for water supply system with transmission temperature not exceeding 45 ℃. Plastic pipes are used for drainage, wastewater, chemicals, heating and cooling fluids, food, ultra pure liquids, mud, gas, compressed air and vacuum system applications.
PVC pipe fittings include direct connection, tee and cross joint, and the tee is divided into 45 degrees and 90 degrees.
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According to experts in agricultural machinery research, in the past, because farmers did not have the need for food drying equipment, the relative delays in domestic R&D production of grain drying equipment were relatively low, and the number of related products was low, and the selling price was also high. For example, the current domestic "10T-60T" single tower circulating dryer, each priced at 79,000 yuan, "60T-150T" double tower combination dryer, each priced at 149,000 yuan, "150T-400T" three Tower combination dryer, each priced at 246,000 yuan. It is understood that the smallest model of wheat drying equipment provided to farmers on the market is a one-time drying of 8 tons, which takes 6 hours and the selling price is about 80,000 yuan per station. Although it is already a very low price, farmers can't afford each household. Some farmers told reporters that drying 8 tons of wheat per stove could not produce as much wheat as one family. They simply couldn't get together to dry one oven of wheat. Is there a smaller drying facility on the market? The reporter inquired about the agricultural machinery research department. They explained that now there is no more than 8 tons of wheat drying equipment per stove in the country. At present, the Agricultural Machinery Research Department is applying to the Commission of Agriculture, Science and Technology, and other departments for the development of small-scale grain drying equipment. If the project can be approved through project approval, it will take at least two years. Is it really difficult to develop small grain drying equipment? What is the technical bottleneck? An agricultural machineman who did not want to disclose his name told reporters that China’s agricultural research and development level is now world-class, and large-scale machinery, including large-scale combine harvesters, can all be developed and produced by itself. The research and development of a small grain drying equipment will not be possible. How difficult is it. The problem is that quite a number of agricultural machinery manufacturers have not fully understood this emerging market and the related scientific research investment is not enough. In addition, the agricultural machinery subsidy standard that the country has introduced now has high requirements for small grain drying equipment. Only when it meets relevant standards can it be included in the subsidy range. Once the subsidy list cannot be entered, the market has a demand, but considering that the enthusiasm of the farmers to purchase will be affected, the production enterprises are therefore worried and do not dare to get involved.
It is understood that in order to solve the farmers' wheat drying problem, the Tianjin Agricultural Machinery Department has actively introduced related companies to enter the Tianjin market to buy wheat drying equipment for farmers to bypass, and encourage large agricultural machinery and agricultural cooperatives to purchase. However, from a long-term point of view, to solve the problem of grain drying, we must also walk on two legs. First, develop small drying equipment as soon as possible to facilitate farmers to purchase and use. The other is to develop specialized grain drying households and specialize in professional grain drying.
1. It has good tensile and compressive strength, but its flexibility is not as good as other plastic pipes.
2. Small fluid resistance: the pipe wall of PVC-U pipe is very smooth and has little resistance to fluid. Its roughness coefficient is only 0.009. Its water transmission capacity can be 20% higher than that of cast iron pipe with the same pipe diameter and 40% higher than that of concrete pipe.
3. Excellent corrosion resistance and drug resistance: PVC-U pipe has excellent acid, alkali and corrosion resistance, is not affected by moisture and soil pH, and does not need any anti-corrosion treatment during pipe laying.
4. Good water tightness: the installation of PVC-U pipe has good water tightness whether it is connected by bonding or rubber ring.
5. Anti bite: PVC-U pipe is not a nutrient source, so it will not be eroded by rodents. According to the experiment conducted by the National Health Foundation in Michigan, mice will not bite PVC-U pipes.
6. Performance test: curing time shrinkage splitting strength tensile property peel strength thermal stability application period storage period release of harmful substances.
Potential market demand for small grain drying equipment in Tianjin
At the moment, it is the wheat harvest season. Reporters in Tianjin interviewed districts and counties and found that many farmers are drying the harvested wheat on the highway. This not only caused food pollution, but also reduced the quality of wheat, which also affected traffic safety. In the unlikely event of a sudden rain, sudden changes in the weather, etc., you can only watch the wheat that has arrived because it cannot be dried in time and cause mildew and spoilage. In Jinghai County, a farmer told reporters that the original village has a wheat field, and the de-sanded wheat can be dried in the local area. But now, because the combine harvester can thresh at a time, the wheat farms are abandoned and the crops are changed. Naturally, there is no place for drying wheat, and they can only be put on the road and they have no other good way. When a reporter asked why they did not buy a wheat dryer, the farmers told us that the cheapest wheat drying equipment is now nearly 100,000 yuan, they can not afford it; the market is also lack of professional grain drying companies, so only We dried wheat on the road.