When you see this question, you must be thinking about it. Isn't it a good thing for the whole project that the excavator's elongated arm works fast? Why is this a problem? In fact, the speed mentioned here is based on the set speed of your excavator. Some excavators have been refitted and installed Komatsu excavator telescopic boom, which is invalid due to the difference in the speed of the equipment itself. So how to solve this problem? The following contents hope to help you answer this question!
The excavator with elongated arm working device has long arm and shovel pole and wide working range. When the excavator sets its working speed according to the normal working speed, the speed of its arm and bucket line is too fast to be controlled by the operator, which is prone to safety accidents. Therefore, it is necessary to solve the problem that the running speed of the lengthened arm is too fast.
2. Choose improvement plans:
The main control valve of excavator working device is controlled by pilot pressure oil. The pilot pressure 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 loop. It can be improved by reducing the size of the main control valve.
Extended arm excavator
It can be seen from the flow and area curves of the main control spool that the opening process of the main control spool is gradually increasing. The larger the spool stroke is, the larger the flow area of the main control valve is. When the spool moves to the end of the stroke, the opening reaches the maximum and the flow through the main control valve reaches the maximum.
It can be seen that the limit of the main control spool can reduce the stroke of the spool. When the left and right ends of the main valve core move, the control valve core can not achieve a complete stroke, and the opening of the main valve can not reach the maximum, which can reduce the flow area, reduce the flow of the hydraulic cylinder, and thus reduce the speed of the working equipment.
3. Implementation and verification:
On the basis of the above analysis, through the measurement of the main control valve, the whole stroke of the spool is determined to be 10 mm. Installation of the main control valve spool travel limit joint can significantly reduce the speed of the working device.
Taking the moving wedge drop as an example, the control coordination test is carried out after the travel limit joint is installed. It is found that when the valve core travel restriction joint is installed with 2.5 mm travel restriction, all indicators of the mobile arm decrease, and the control and coordination of the whole machine reach the descending speed of the excavator arm of the standard working equipment, thus meeting the needs of the excavator.
Using the above method to improve the elongated arm of excavator can effectively solve the problem of too fast working device. Have you ever learned it? If you need it, please call us for advice. Our website is http://www.rbaras.com.