自上料搅拌车的液压系统通常分两大类：开式系统与闭式系统，当前市场的低端企业主要以开式系统为主，高的端企业主要以推进口闭式系统；推进口闭式系统结构紧凑，可靠性高，下边对两种结构进行详解，便于识别：

The hydraulic system of self loading mixer truck is generally divided into two categories: open system and closed system. The low-end brands in the current market mainly focus on open system, while the high-end brands mainly focus on the propulsion port closed system; The propulsion port closed system has a compact structure and high reliability. The following two structures are explained in detail for easy identification:

开式系统：

Open system:

双联齿轮泵+摆线齿轮马达

Double gear pump+cycloidal gear motor

原理：

Principle:

两个定量齿轮泵。在低速状态，液压泵向液压马达供油；高速状态，油泵同时向液压马达供油。液压泵的排油量是不同的，主要根据高速与低速供油状态的转速而定。换向阀控制搅拌筒正反转，溢流阀7起过载保护作用。溢流阀与单向阀起着防冲击的补油保护作用。

Two constant displacement gear pumps. At low speed, the hydraulic pump supplies oil to the hydraulic motor; At high speed, the oil pump supplies oil to the hydraulic motor at the same time. The oil discharge of the hydraulic pump is different, mainly depending on the speed of high speed and low speed oil supply. The reversing valve controls the positive and reverse rotation of the mixing drum, and the overflow valve 7 plays an overload protection role. The overflow valve and one-way valve play the role of anti impact oil supplement protection.

特点：

characteristic:

通过发动机的油门来调节转速，能耗大、不经济。需要大油箱，结构庞大；液压油中易混入空气，振动与噪声大，可靠性差、寿命短。

Adjusting the speed through the throttle of the engine consumes a lot of energy and is not economical. Large oil tank is required and the structure is huge; The hydraulic oil is easy to mix with air, with large vibration and noise, poor reliability and short service life.

闭式系统：

Closed system:

轴向柱塞变量泵+定量马达

Axial piston variable displacement pump+constant displacement motor

原理：伺服液压缸控制柱塞变量泵斜盘的方向与倾角，用来调节柱塞泵3的方向与排量。高压溢流阀能防止系统过载，起保护作用。两个高压溢流阀的开启压力值可根据液压马达两侧油路的负载分别调定，以适应不同工况的要求。

Principle: The servo hydraulic cylinder controls the direction and inclination of the swashplate of the piston variable displacement pump to adjust the direction and displacement of the piston pump 3. High pressure relief valve can prevent system 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.

特点：

characteristic:

通过柱塞变量泵斜盘调整转速、转向，结构紧凑，油箱容积小，散热要求高，工作稳定，可靠性高、寿命长。

The rotary speed and steering direction are adjusted through the swashplate of the plunger variable displacement pump. The structure is compact, the tank volume is small, the heat dissipation requirements are high, the work is stable, the reliability is high, and the service life is long.

讲解搅拌车的液压系统通常分两大类的相关信息就讲解完毕了，建议您在平常使用中仔细对其进行检查，以防止问题的出现影响了使用以及工作质量，更多相关内容就来我们网站https://www.zishangliaojiaobanji.cn进行咨询了解吧！

The explanation of the hydraulic system of the mixer is usually divided into two categories. It is recommended that you carefully check the hydraulic system in normal use to prevent problems from affecting the safety and quality of work. More relevant information can be found on our website https://www.zishangliaojiaobanji.cn Consult and understand!