Zinc deficiency The young leaves of the seedlings are light yellow and light white, and the central leaves have obvious green color, and the old leaves are grayish brown. At this time, it can be applied with 1.5-2.0 kg of zinc sulfate or foliar spray with 0.2-0.3% zinc sulfate solution, which can be sprayed 3 times, every 5-6 days.
Molybdenum deficiency The leaf veins of the old leaves are chlorotic and yellow, the leaves are scorched and curled inward, and the kernels shrink. At this time, foliar spray can be performed with 0.15%-0.2% ammonium molybdate solution.
Iron deficiency The leaf veins of the new leaves are green and yellow, the veins remain green and are obviously striped, and the stems and sheaths are purple-red. At this time, spray with 0.2-0.3% ferrous sulfate solution, spray 3 times, each interval 5-7 days.
Boron deficiency Young leaves can not be opened and white, gradually withered and dead, white streaks between the old leaves and veins, the plants are short and thin. At this time, 85 g of borax or 50-60 g of boric acid can be sprayed with 60 kg of water for foliar spraying, which can be sprayed 3 times, each interval of 5-7 days.
The symptoms of manganese deficiency often start from the new leaves, the young leaves turn yellow, there are green spots between the veins, the leaves are soft and the roots are slender and white. At this time, the 0.2% manganese sulfate solution can be used for foliar spraying 2-3 times, each interval of 7-10 days.
Copper-deficient plants grow slowly and are short, and they form clumps after the top forging, and the leaves are grayish yellow or red and yellow with white spots, and the ear development is poor. It can be applied to 1 kg of copper sulfate or foliar spray with 0.2% copper sulfate solution.
Thin wall ball bearings are simple in structure and easy to use. Mainly used to bear radial load, but when the radial clearance of the bearing is increased, it has a certain performance of Angular Contact Ball Bearing and can bear combined radial and axial load.
When the speed is high and thrust ball bearings are not suitable, thin wall ball bearings can also be used to bear pure axial loads. Compared with other types of bearings of the same size, this type of bearing has a small friction coefficient and a high limit speed. But it is not impact resistant and not suitable for heavy loads.
Thin wall ball bearings have a bearing inner diameter and outer diameter ratio less than a specified value. The ratio of bearing outer diameter to bearing inner diameter is 1.25 or less. It is called thin wall ball bearings, which means that the outer diameter-inner diameter value of the bearing is very small and the bearing wall is very thin.
The precision required by thin wall ball bearings is very high, because the wall is very thin, so the weight it can carry is also very low, and the impact resistance is very poor, so this must be selected according to the use environment!
Characteristics
The specific use of thin wall ball bearings:
Model airplanes, remote control cars, machine tools, motors, water pumps, agricultural machinery, textile machinery, laser printers, instruments, measuring instruments, electronic accessories, motors, motors, etc.
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