正当年底，多地项目进入关键施工阶段，在湖南省岳阳正在建的一个高新技术产业开发区内建设现场，挖掘机加长臂忙碌不停、铲车来回运输，吊车林立等机器轰鸣生一片，为了明年三月能交付，施工人员分布在各个角落，加班加点赶工期，整个项目进度正紧张有序的进行着。
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.
挖掘机加长臂厂家
Excavator extension arm manufacturer
挖掘机加长臂定制工艺：除延续了一贯的严谨与苛刻之外，在材料上使用高强度钢材，再加上标准的工装、高精度的加工设备，轻量化的设计等，在降低工作装置重量的同时，也保证其具有优势的耐久性，配置丰富，多种型号随意组合。
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.

挖掘机加长臂的主要配置：为了更好地节省用户更换加长臂时的成本，我们认真分析过原车上的哪些配件是可以用回原来的，哪些是必须更换的，标准臂更换成加长臂时的标准配置如下：加长大小臂一套、挖斗一个、铲斗油缸一支、软管4条、黄油管3条、连杆总成一套、运输连杆一套、销轴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.
凡主泵输出的流量是定值的液压系统为定量液压系统；反之，主泵的流量可以通过调节系统进行改变的则称为变量系统。在定量系统中各执行元件在无溢流情况下是按油泵供给的固定流量工作，油泵的功率按固定流量和工作压力确定；在变量系统中，常见的是双泵双回路恒功率变量系统，有分功率变量与全功率变量之分。
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.
分功率变量调节系统是在系统的每个回路上分别装一台恒功率变量泵和恒功率调节器，发动机的功率平均分配给各油泵；全功率调节系统是有一个恒功率调节器同时控制着系统中的所有油泵的流量变化，从而达到同步变量。
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.
开式系统中执行元件的回油直接流回油箱，其特点是系统简单、散热效果好。但油箱容量大，低压油路与空气接触机会多，空气易渗入管路造成振动。单斗液压挖掘机的作业主要是油缸工作，而油缸大、小有腔的差异较大、工作频繁、发热量大，因此绝大多数单斗液压挖掘机采用开式系统；闭式回路中的执行元件的回油路是不直接回油箱的，其特点式结构紧凑，油箱容积小，进回油路中有一定的压力，空气不易进入管路，运转比较平稳，避免了换向时的冲击。但系统较复杂，散热条件差‘单斗液压挖掘机的回转装置等局部系统中，又采用闭式回路的液压系统的。为补充因液压马达正反转的油液漏损，在闭式系统中往往还设有补油泵。
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.