正當年底，多地項目進入關鍵施工階段，在湖南省岳陽正在建的一個高新技術產業開發區內建設現場，挖掘機加長臂忙碌不停、鏟車來回運輸，吊車林立等機器轟鳴生一片，為了明年三月能交付，施工人員分布在各個角落，加班加點趕工期，整個項目進度正緊張有序的進行著。
At the end of the year, key projects in many places entered the key construction stage. At the construction site of a high-tech industrial development zone under construction in Yueyang, Hunan Province, excavators and extenders were busy, forklifts were transported back and forth, cranes were standing, and other machines were roaring. In order to be delivered in March next year, construction workers were distributed in all corners, working overtime to catch up with the construction period, and the whole project progress was proceeding in a tense and orderly manner.
挖掘機加長臂廠家
Excavator extension arm manufacturer
挖掘機加長臂定制工藝：除延續了一貫的嚴謹與苛刻之外，在材料上使用高強度鋼材，再加上標準的工裝、高精度的加工設備，輕量化的設計等，在降低工作裝置重量的同時，也保證其具有優勢的耐久性，配置豐富，多種型號隨意組合。
Customization process of excavator extension arm: in addition to the consistent rigor and rigor, the use of high-strength steel in materials, standard tooling, high-precision processing equipment, lightweight design, etc., while reducing the weight of the working device, also ensure its superior durability, rich configuration, and a variety of models can be combined at will.

挖掘機加長臂的主要配置：為了更好地節省用戶更換加長臂時的成本，我們認真分析過原車上的哪些配件是可以用回原來的，哪些是必須更換的，標準臂更換成加長臂時的標準配置如下：加長大小臂一套、挖斗一個、鏟斗油缸一支、軟管4條、黃油管3條、連桿總成一套、運輸連桿一套、銷軸6支。
Main configuration of the extension arm of the excavator: In order to better save the cost of the user when replacing the extension arm, we have carefully analyzed which parts on the original vehicle can be used back and which must be replaced. The standard configuration when replacing the standard arm with the extension arm is as follows: one set of extended boom, one bucket, one bucket oil cylinder, four hoses, three grease pipes, one set of connecting rod assembly, one set of transport connecting rod, and six pin shafts.
凡主泵輸出的流量是定值的液壓系統為定量液壓系統；反之，主泵的流量可以通過調節系統進行改變的則稱為變量系統。在定量系統中各執行元件在無溢流情況下是按油泵供給的固定流量工作，油泵的功率按固定流量和工作壓力確定；在變量系統中，常見的是雙泵雙回路恒功率變量系統，有分功率變量與全功率變量之分。
The hydraulic system whose output flow of the main pump is a constant value is a quantitative hydraulic system; On the contrary, the flow of the main pump can be changed by the regulating system, which is called the variable system. In the quantitative system, each actuator works according to the fixed flow supplied by the oil pump without overflow, and the power of the oil pump is determined according to the fixed flow and the maximum working pressure; In the variable system, the common variable system is the dual-pump and dual-loop constant power variable system, which can be divided into sub-power variable and full-power variable.
分功率變量調節系統是在系統的每個回路上分別裝一臺恒功率變量泵和恒功率調節器，發動機的功率平均分配給各油泵；全功率調節系統是有一個恒功率調節器同時控制著系統中的所有油泵的流量變化，從而達到同步變量。
The split power variable control system is to install a constant power variable pump and a constant power regulator on each circuit of the system, and the engine power is evenly distributed to each oil pump; The full-power regulation system has a constant power regulator that simultaneously controls the flow changes of all oil pumps in the system, so as to achieve synchronous variables.
開式系統中執行元件的回油直接流回油箱，其特點是系統簡單、散熱效果好。但油箱容量大，低壓油路與空氣接觸機會多，空氣易滲入管路造成振動。單斗液壓挖掘機的作業主要是油缸工作，而油缸大、小有腔的差異較大、工作頻繁、發熱量大，因此絕大多數單斗液壓挖掘機采用開式系統；閉式回路中的執行元件的回油路是不直接回油箱的，其特點式結構緊湊，油箱容積小，進回油路中有一定的壓力，空氣不易進入管路，運轉比較平穩，避免了換向時的沖擊。但系統較復雜，散熱條件差‘單斗液壓挖掘機的回轉裝置等局部系統中，又采用閉式回路的液壓系統的。為補充因液壓馬達正反轉的油液漏損，在閉式系統中往往還設有補油泵。
In the open system, the return oil of the actuator directly flows back to the oil tank, which is characterized by simple system and good heat dissipation effect. However, the oil tank has a large capacity, and the low pressure oil circuit has many opportunities to contact with the air, which is easy to penetrate into the pipeline and cause vibration. The operation of single bucket hydraulic excavator is mainly the operation of oil cylinder, while the difference between large and small oil cylinder and cavity is large, the operation is frequent, and the heat generation is large. Therefore, most single bucket hydraulic excavators adopt open system; The oil return circuit of the actuator in the closed circuit does not return directly to the oil tank. Its characteristic structure is compact, the volume of the oil tank is small, there is a certain pressure in the oil inlet and return circuit, the air is not easy to enter the pipeline, the operation is relatively stable, and the impact of reversing is avoided. However, the system is relatively complex and the heat dissipation condition is poor. The closed loop hydraulic system is also used in the rotary device and other local systems of the single bucket hydraulic excavator. In order to supplement the oil leakage caused by the positive and negative rotation of the hydraulic motor, a make-up pump is often installed in the closed system.