Because the construction machinery has the characteristics of mobility, so its Design of hydraulic station The design of medium hydraulic cylinder is different from that of ordinary hydraulic cylinder. The following problems should be paid attention to in the design of hydraulic cylinder of mobile construction machinery
1. Considering the low and high oil level requirements of construction machinery when going uphill, meet the requirements that your oil suction filter can not be exposed when going uphill and downhill, and the end covers of door oil filter and air filter cannot be in the oil.
2. Balance the weight to maintain the proper center of gravity of the vehicle;
3. In order to ensure good heat dissipation and low oil temperature, it is necessary to consider the installation position and the ventilation line of finished vehicle.
4. The working conditions should be considered to prevent oil leakage or dirty things from entering the harsh environment with higher requirements than ordinary system;
5. Fully consider the layout, the shape is not necessarily regular, and coordinate with the adjacent components;
6. Pickling and phosphating are generally used for rust prevention treatment of inner wall.
7. In the design and calculation of tank volume, in order to better precipitate impurities and separate air, the effective volume of oil tank (whose liquid level only accounts for 80% of the tank height) is generally taken as Hydraulic pump The amount of oil discharged per minute is 2-7 times, 2-4 times when the system is low-pressure system, and 5-7 times when the system is in medium and high pressure. Generally speaking, it is twice as much as that of mobile machinery, that is to say, there must be enough oil. The empirical formula v = (1.2 ~ 1.25) × ((0.2 ~ 0.33) * QB + QG) is generally used, where QB is the flow rate of the pump and QG is the capacity of the hydraulic cylinder.