Seeing this problem, everyone must have questions. Isn't it a good thing that the boom works faster throughout the project? Why is this a problem? In fact, the speed mentioned here is compared to the speed set by your excavator itself. After some excavators are refitted and installed with the extension arm of the excavator, the speed of the extension arm is different from that of the equipment itself, resulting in the failure of the extension arm to work. So how to solve this problem? The following content hopes to help you answer this question!

1. 原因:

1. Reason:

对于配备加长臂工作装置的挖掘机，动臂和铲斗杆相对较长，工作范围较大。挖掘机在设定工作速度时，移动臂和铲斗杆速度过快，操作人员难以控制，容易发生事故。因此，有必要延长臂工作装置移动过快的问题。

For the excavator equipped with the working device of the long arm, the boom and the bucket bar are relatively long and the working range is large. When setting the working speed of the excavator, the speed of the moving arm and the bucket rod is too fast, which makes it difficult for the operator to control and easy to cause safety accidents. Therefore, it is necessary to solve the problem that the working device of the extension arm moves too fast.

2. 选择改进计划:

2. Select improvement plan:

挖掘机工作装置的主控制阀由导压油控制，导压油进入主控制阀芯的末端，推动主控制阀芯左右移动，打开主控制阀回路。它可以通过减小主控制阀的尺寸来改进。

The main control valve of the excavator working device is controlled by the pilot oil. The pilot oil enters the end of the main control valve core, pushes the main control valve core to move left and right, and opens the main control valve circuit. It can be improved by reducing the size of the main control valve.

根据主控制阀芯行程和流量面积曲线可以看出，主控制阀芯的开启过程是逐渐增大的，阀芯行程越大，主控制阀的流量面积越大。当阀芯移动到冲程末端，通道口达到时，通过主控制阀的流量达到。

According to the stroke and flow area curve of the main control valve core, it can be seen that the opening process of the main control valve core is gradually increasing. The larger the stroke of the valve core is, the larger the flow area of the main control valve is. When the spool moves to the end of the stroke and the port reaches the maximum, the flow through the main control valve reaches the maximum.

从而，主控制阀芯极限，可以减少阀芯的行程。当主配压阀芯左、右端移动,控制主配压阀芯不能达到完整的中风,主控阀阀门开度不能达到值,可以减少流动区域,降低液压缸的流量,从而减少工作设备的速度。

Thus, the limit of the main control valve core can reduce the stroke of the valve core. When the left and right ends of the main pressure distribution valve core move, the control main pressure distribution valve core cannot achieve a complete stroke, and the opening of the main control valve cannot reach the maximum value, which can reduce the flow area and the flow of the hydraulic cylinder, thus reducing the speed of the working equipment.

3.实现和验证:

3. Implementation and verification:

根据以上分析，通过对主控制阀的测量，确定阀芯的全行程为10mm。主控制阀阀芯行程限位接头安装后，工作装置的速度明显降低。

According to the above analysis, through the measurement of the main control valve, the full stroke of the valve core is determined to be 10 mm. After the main control valve element travel limit joint is installed, the speed of the working device is obviously reduced.

以动态分降为例,机动性和协调测试进行安装后的旅行限制关节,并发现当阀芯旅行限制接头安装了2.5毫米的旅行限制,这些指标的移动胳膊和整个机器的可操作性和协调所有达到的标准速度挖掘移动臂的工作装置,可以满足挖掘机的要求。

Taking dynamic grading as an example, the mobility and coordination test are carried out after the installation of travel limit joint, and it is found that when the travel limit joint of valve core is installed with a travel limit of 2.5mm, the operability of the mobile arm and the whole machine of these indicators and the working device of coordinating all the reach standard speed digging mobile arms can meet the requirements of excavator.

利用上述方法，可有效地挖掘机臂部工作速度过快的问题。你学会了吗?

Using the above method, the problem of too fast working speed of excavator arm can be solved effectively. Have you learned?