The determination of soil moisture in the five models by the soil moisture multi-point monitor can be found that the soil moisture content is the highest at 10 cm depth in each model. No-tillage treatment of soil moisture at the depth of 0~100cm was generally smooth, with a large change at the surface of 20cm, and a small change of soil moisture at the depth of 20~100cm. The soil moisture in the other four tillage patterns decreased at the depth of 10~60cm, and increased at the depth of 70~100cm. In general, no-tillage stubble treatment has always maintained a higher soil moisture value, while the other four models 0-100cm depth of soil moisture with the depth of the fluctuations are generally consistent. In other words, with the increase of soil depth, the response of soil moisture with depth to different cover tillage patterns gradually becomes more and more complex. With the increase of soil depth, the soil moisture of each covered tillage model increases with depth. The degree of response is reduced. In addition, the vertical variation coefficient of soil moisture in the five cropping patterns was in the order of conventional tillage (0.1376)> shallow rotation coverage (0.1360)> traditional coverage (0.1309)> deep turning coverage (0.1265)> no-tillage tillage ( 0.1167) also shows that the variation of soil moisture in the conventional tillage with depth is the strongest, while the soil moisture in the no-tillage stubble is relatively weakest with depth.
In the five cover tillage modes, the soil water content of no-tillage stubble was the highest, followed by the soil moisture content of deep tillage coverage was slightly lower than that of no-tillage stubble retention, and the moisture content of shallow cover soil was similar to that of conventional cover soil. The traditional cultivation soil moisture The lowest content. In addition, since no-tillage leaves crops when summer corn is harvested, and other treatments are carried out at the time of sowing, the soil water content of the remaining four crops will fluctuate little when the moisture content of the other four treatments declines quickly within a certain period before sowing. Good preservation of soil moisture during the handover period of two crops.
Through analysis and summary of the measurement results of the soil moisture multi-point monitor, it can be roughly found that the five types of cover tillage patterns are at depths of 0 to 100 cm, so that the soil moisture content of the stubble-free tillers is the highest, and the soil moisture content of the next deep tillage covers is slightly lower than that of no-tillage. The remaining soil moisture content was similar to that of the conventional cover soil, and the soil moisture content of the conventional cultivation soil was the lowest. The coverage tillage pattern was more sensitive to precipitation than the traditional cultivation pattern at the depth of the crop root distribution range of 0 to 50 cm. Water can be stored at a depth where the crop is easier to use. At the depth of 50~100cm, the response degree of soil moisture and precipitation is relatively lower than the depth of 0~50cm. In terms of soil moisture storage capacity, the soil water storage capacity of no-tillage coverage was the highest, and the soil water storage capacity of shallow-sweep coverage and conventional tillage was relatively low. The water storage capacity of deep-turnover cover and conventionally-covered soil was relatively centered.
Excavator Cylinder Piston Seals
Precautions for the installation of hydraulic cylinder piston seals in excavators
1. The sealing of the oil cylinder piston should use products of reliable quality to ensure good sealing performance.
2.Before installing the oil cylinder piston seal, the seal and sealing groove should be cleaned to ensure that the sealing surface is free of impurities.
3. When installing the seal, the correct installation sequence and direction should be carried out according to the drawing requirements to ensure the correct installation of the seal.
4.When installing the seal, special tools should be used to avoid using sharp tools and hard objects to damage the seal.
5. When installing the seal, attention should be paid to whether the seal groove is damaged or worn. If so, it should be replaced or repaired in a timely manner.
6. When installing the seal, an appropriate amount of lubricating oil should be applied to avoid friction damage to the seal during installation.
7.When installing the seal, it should be ensured that the compression of the sealing ring meets the requirements to avoid excessive or insufficient compression leading to seal failure.
8.After installing the seal, a sealing test should be conducted to ensure that the sealing performance meets the requirements.
Hydraulic cylinder piston seals, hydraulic cylinder seal, boom seal
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