自上料攪拌車的液壓系統通常分兩大類：開式系統與閉式系統，當前市場的低端品牌主要以開式系統為主，高的端品牌主要以推進口閉式系統；推進口閉式系統結構緊湊，可靠性高，下邊對兩種結構進行詳解，便于識別：

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:

開式系統：

Open system:

雙聯齒輪泵+擺線齒輪馬達

Double gear pump+cycloidal gear motor

原理：

Principle:

兩個定量齒輪泵。在低速狀態，液壓泵向液壓馬達供油；高速狀態，油泵同時向液壓馬達供油。液壓泵的排油量是不同的，主要根據高速與低速供油狀態的轉速而定。換向閥控制攪拌筒正反轉，溢流閥7起過載保護作用。溢流閥與單向閥起著防沖擊的補油保護作用。

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.

特點：

characteristic:

通過發動機的油門來調節轉速，能耗大、不經濟。需要大油箱，結構龐大；液壓油中易混入空氣，振動與噪聲大，可靠性差、壽命短。

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.

閉式系統：

Closed system:

軸向柱塞變量泵+定量馬達

Axial piston variable displacement pump+constant displacement motor

原理：伺服液壓缸控制柱塞變量泵斜盤的方向與傾角，用來調節柱塞泵3的方向與排量。高壓溢流閥能防止系統過載，起保護作用。兩個高壓溢流閥的開啟壓力值可根據液壓馬達兩側油路的負載分別調定，以適應不同工況的要求。

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.

特點：

characteristic:

通過柱塞變量泵斜盤調整轉速、轉向，結構緊湊，油箱容積小，散熱要求高，工作穩定，可靠性高、壽命長。

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.

講解攪拌車的液壓系統通常分兩大類的相關信息就講解完畢了，建議您在平常使用中仔細對其進行檢查，以防止問題的出現影響了使用安全以及工作質量，更多相關內容就來我們網站//wwcoms.com.cn進行咨詢了解吧！

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 //wwcoms.com.cn Consult and understand!