Commonly used socket head cap Screws are: cylindrical head hexagon socket (also known as cup head), pan head hexagon socket screws (also known as round cup, half round head hexagon socket), countersunk head hexagon socket screws (also known as flat head hexagon socket, flat cup), flower hexagon socket (also known as plum slot hexagon socket) Slotted Cheese Head Screw ,Slotted Head Screw ,Slotted Pan Head Screw ,Round Head Wood Screw Kunshan Zhonggu Precision Hardware Co., Ltd. , https://www.zgfastener.com
First, improve the production and quality of bio-fertilizers as soon as possible to ensure the technical standards for green food production. One of the most important production materials for green food production is bio-organic fertilizer. At present, bio-organic fertilizer can not meet the needs of green food production and development regardless of production or quality. According to the province's green food planting area this year to 600,000 hectares, the general demand for commercial green food fertilizer is about 240,000 tons. The annual production capacity of our province is less than 100,000 tons. In addition, the investment and construction of factories outside the province and the introduction of green food fertilizers from outside the province total no more than 150,000 tons. The gap between supply and demand is still very large.
Recommendations: 1 Relevant departments should actively support the development, introduction and development of green food fertilizers from various aspects, expand production capacity, and supplement shortages.
2 Green food special fertilizer production should adhere to the path of factory, specialization and commercialization to ensure the quality standards of fertilizer. 3 Governments at all levels should vigorously support the production of green food commodity fertilizers in the province, and develop and improve the province's own fertilizer industry.
The second is to establish and improve the application model of biological fertilizer application. The fertilizer efficiency of biological fertilizers is greatly affected by natural factors, high fertility and low fertility areas, areas with good production conditions and poor production conditions, saline-alkali land and arid land, legumes and non-legume crops, and the fertilizer effects of biological fertilizers are different. In order to facilitate the farmers to better promote the application of bio-fertilizers, the technical model of bio-fertilizer application should be formulated according to different local conditions.
The third is to increase efforts to grasp the use of crop straw roots and return to the field and the use of various fertilizer raw materials. Crop straw contains a large amount of organic matter and polysaccharides, which is an excellent carrier for biological bacteria and a good source of bio-organic fertilizer. The yield of crop straw in our province is high and there are many surpluses. The use of straw to fertilize and return to the field is a breakthrough measure for soil fertility and is also the focus of developing green food fertilizer. It is necessary to increase efforts and speed up the promotion. The output of livestock and poultry manure in our province reaches 35 million tons. Conditional aquaculture plants should carry out harmless treatment of manure, establish a biological fertilizer plant, and improve the utilization rate of manure recovery. In addition, the province's peat and lignite resources are also quite rich, it contains a lot of organic matter and humic acid is an excellent raw material for bio-organic fertilizer.
The fourth is to carry out in-depth publicity and technical guidance work on bio-fertilizer technical standards. The promotion and application of bio-fertilizer is still a relatively new technical field for grassroots farmers, and there is still lack of practical and management experience. The current bio-fertilizer (magnetic fertilizer) market is chaotic. To this end, it is necessary to widely publicize the technical measures and quality standards of biological fertilizers. Carry out various forms of technical training, adopt effective promotion methods, and strengthen guidance so that farmers can truly understand the technical principles, implement technical standards to every production link, and extend the vitality of biological fertilizers with strict technical standards to avoid walking. In the 1970s, “Soybean Rhizobium†sold 380,000 tons of soybeans at the local soybean auction in Heilongjiang Province. Heilongjiang Province is China's main soybean producing area. The price of soybeans in auctions is mostly around 1,600 yuan per ton, and the individual price is 1,800 yuan per ton, which is much higher than the expectations of traders.
1. Application: Hexagon socket screws, hexagon socket screws are a kind of hole screws, generally used in machine tools and equipment, chemical equipment, water pumps, ships, power equipment, electronics, electrical appliances, furniture and Other fields, mainly to facilitate fastening, disassembly, not easy to slip the corner and other advantages. Hexagon socket screws need to use the corresponding specifications of the hexagon wrench to load and unload.
2. Reference standard.
Cylindrical head hexagon socket: GB70, DIN912, ISO4762, ANSI/ASME B18.3
Hexagon socket with pan head: ISO7380
Countersunk hexagonal head: DIN7991
Hexagon socket with flower-shaped pan head: flower-shaped pan head (GB2672), flower-shaped cylindrical head (GB6190), flower-shaped countersunk head (GB2673)
At present, the overall progress of bio-fertilizer promotion and application is good. However, according to the requirements of production development, we must promptly solve the existing problems and accelerate the pace of promotion and application.
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