Dry tea There are two ways to dry instant tea, one is spray drying and the other is freeze drying. Before the spray drying, carbon dioxide is injected into the deep tea broth to make the tea juice filled with tiny air sludge. When the spray is synergistic and dry, the carbon dioxide gasification goes out and the tea powder forms a small particle in the middle, which increases the instant solubility. . If adding tea with sugar and fruit juice, boiling dry method or freeze-drying method may also be adopted. The product is like malted milk. Freeze-drying reduces the temperature of tea juice to tens of degrees below zero and then warms it up. At the same time, it decompresses helium to remove water that is difficult to sublimate. Freeze-dried instant tea has a loose texture and is particularly soluble. The solution will do. News link: Spray drying is a method of systematic application of material drying. After the thin material is atomized in the drying chamber, the moisture rapidly vaporizes in contact with the hot air to obtain a dry product. The method can directly dry the solution and the emulsion into a powdery or granular product, and evaporation and crushing can be omitted. Freeze drying is also called sublimation drying. A method of drying in which the aqueous material is frozen below the freezing point, the water is converted to ice, and then the ice is removed to steam in a higher vacuum to remove it. The material can be frozen in a freezer before drying. However, it can be directly frozen in the drying chamber and quickly frozen. The vapor generated by sublimation is removed by a condenser. The vaporization heat required during the sublimation process is generally supplied with heat radiation.
Daily maintenance of excavator hydraulic cylinders
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The hydraulic cylinder of an excavator is one of the important hydraulic components responsible for driving and controlling mechanical movements. In order to ensure the normal use of hydraulic cylinders and extend their service life, daily maintenance is necessary.
1. Regularly clean the hydraulic cylinder: During use, the hydraulic cylinder will be attacked by various pollutants, such as dust, sediment, oil stains, etc. These pollutants can affect the working efficiency and lifespan of the hydraulic cylinder. Therefore, it is necessary to regularly clean the hydraulic cylinder.
2. Regular inspection of seals: The seals of hydraulic cylinders are key components to ensure their normal operation. If the seals are damaged or worn, it can lead to oil leakage or unstable operation of the hydraulic cylinder. Therefore, it is necessary to regularly inspect the sealing components of the hydraulic cylinder and replace them in a timely manner if there is any damage or wear.
3. Regular inspection of hydraulic oil: The operation of hydraulic cylinders requires the support of hydraulic oil, so the quality of hydraulic oil has an important impact on the working effect of hydraulic cylinders. Regularly check the quality of hydraulic oil, and replace it promptly if there is contamination or deterioration.
4. Regularly check the hydraulic pipeline: The hydraulic pipeline is the blood vessel of the hydraulic cylinder. If there is oil leakage or damage to the pipeline, it can cause the hydraulic cylinder to not work properly. Therefore, it is necessary to regularly inspect the hydraulic pipelines and promptly repair or replace them if there is any oil leakage or damage.
5. Regularly lubricate the hydraulic cylinder: The piston rod and piston ring of the hydraulic cylinder need to be lubricated to reduce wear and friction. Therefore, it is necessary to regularly apply lubricating oil to ensure the normal operation of the hydraulic cylinder.
In short, the daily maintenance of excavator hydraulic cylinders is very important, which can extend their service life and improve work efficiency. Regular cleaning of hydraulic cylinders, inspection of seals, hydraulic oil, hydraulic pipelines, and lubrication of hydraulic cylinders are required.