The hydraulic system of the mixer is usually divided into two categories: open system and closed system. The current market brand is mainly open system, and the large quantity mixer is mainly closed system, with compact structure and high reliability. The following two structures are explained in detail to teach you how to identify them
Double gear pump + cycloid gear motor
Axial piston variable displacement pump + quantitative motor
Two fixed displacement gear pumps 4, 5. At low speed, the hydraulic pump 4 supplies oil to the hydraulic motor 13; At high speed, oil pumps 4 and 5 supply oil to hydraulic motor 13 at the same time. The oil displacement of hydraulic pumps 4 and 5 is different, mainly depending on the speed of high-speed and low-speed oil supply state. The reversing valve 8 controls the forward and reverse rotation of the mixing drum, and the overflow valve 7 plays the role of overload protection. Relief valves 9 and 12 and check valves 10 and 11 play the role of anti impact oil supplement protection.
Servo cylinder 2 controls the direction and inclination of the swash plate of the piston variable displacement pump, which is used to adjust the direction and displacement of the piston pump 3. The high pressure relief valve 12 can prevent the system from overload and play a protective role. The opening pressure of the two high pressure relief valves can be adjusted according to the load of the oil circuit on both sides of the hydraulic motor to meet the requirements of different working conditions.
Adjusting the speed through the throttle of the engine consumes a lot of energy and is not economical. Large fuel tank and huge structure are needed; The hydraulic oil is easy to mix with air, and has high vibration and noise, poor reliability and short service life.
By adjusting the speed and steering through the swashplate of the piston variable displacement pump, the structure is compact, the volume of the oil tank is small, the heat dissipation requirement is high, the work is stable, the reliability is high, and the service life is long.
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