Angular contact ball bearings mainly bear large unidirectional axial load. The greater the contact angle, the greater the load bearing capacity. The material of cage is steel plate, brass or engineering plastics. The forming method is stamping or turning. It is selected according to the bearing form or using condition. Others include combined angular contact ball bearings, double row angular contact ball bearings and four-point contact ball bearings.
Angular contact bearings are able to support radial load and axial load. As single row angular contact ball bearings can only support axial load in single direction, matched bearing mounting is often adopted to them as matched parts of bearings, preload for them is more convenient. Retainers are made of brass, synthetic resins or others subject according to individual bearing features and application conditions.
a=15 °7000C
a=25 °7000AC
a=40 °7000B
Angular Contact Ball Bearing,P4 Angular Contact Ball Bearing,High Speed Angular Contact Ball Bearing,Double Row Angular Contact Ball Bearing Shijiazhuang Longshu Mechanical & Electrical Equipment Trading Co., Ltd. , https://www.longsbearings.com
First, increase the application of organic manure. Compost, manure, cake fertilizer, manure and manure, river mud, etc. are all good organic fertilizers.
Second, advocate the return of straw to the field. Studies have shown that straw directly returning to the field is better than applying the same amount of manure. At present, the north of China is vigorously promoting the straw returning technology with wheat sorghum as the main measure. When harvesting wheat, leave 20~30 cm high wheat straw, after a rainy season, when the wheat is re-seeded, It has become a semi-decomposed state and has become a good organic fertilizer. Straw returning to the field is simple and easy, saving labor and labor, but when returning to the field, chemical nitrogen fertilizer should be applied to avoid microbial and crop nitrogen.
Third, grain and fertilizer rotation, intercropping, land use and land combination. With the development of agricultural production, the multiple cropping index is getting higher and higher, resulting in a decrease in soil organic matter content and a decrease in fertility. The implementation of grain and fertilizer rotation and intercropping system can not only maintain and improve the organic matter content, but also improve the quality of soil organic matter and activate the aging humus.
Fourth, cultivate green manure. The cultivated green manure can provide abundant organic matter and nitrogen for the soil, improve the agro-ecological environment and the physical and chemical properties of the soil. The main varieties are: medlar, medlar, mung bean, Tianjing and so on. Scorpions are usually sown in early September and used as base fertilizer and seed for spring crops. They can also be sown from March to April for topdressing. The seeding rate is 3~5 kilograms per acre. In the second year of April, the buds can be pressed. It can be sown in the spring, summer and autumn seasons. Generally, it takes 1~1.5 kilograms per acre and is pressed during the flowering period. Mung bean and Tianjing can be sown from March to June, generally 3~5 kg per mu, and pressed at the beginning of flowering.
Author: Shen Hui Source: Economic Daily rural version
Angular Contact Ball Bearing
Bearing Brand
LS
Bearing Types
Angular Contact Ball Bearing
Bearing Material
Chrome steel Gcr15/Stainless steel
Bearing Precision
P0,P6,P5,P4,P2
Bearing Package
Plastic bag+carton box
Bearing Shipping
1-3 work days
Angular contact ball bearing include:
1) Single row angular contact ball bearing
2) Matched angular contact ball bearing
3) Double row angular contact ball bearing
4) Four-point contact ball bearing
How to improve soil organic matter content
Soil organic matter refers broadly to carbon-containing organic compounds present in various forms in the soil. For low-yielding fields, the organic matter content can be increased by the following methods to fertilize low-yield soils. For high-yield fields, organic matter needs to be continuously replenished due to the continuous decomposition of organic matter.
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