The hydraulic cylinder is the actuator of the hydraulic system. The operation failure is caused by the hydraulic cylinder itself. It is also related to the entire system. Therefore, when troubleshooting the hydraulic cylinder operation, you should carefully observe the symptoms of the failure. Logical reasoning and a method of carefully analyzing the cause of the fault from the outside to the inside, so as to determine the elimination method and avoid blind disassembly and unloading. Among the many reasons for the failure of hydraulic cylinder operation, incorrect installation, use and maintenance are the reasons for its failure, and these problems are not explained here. This article only systematically analyzes the typical typical operating failure-hydraulic cylinder failure.
The main manifestations of hydraulic cylinder failure are: the hydraulic cylinder cannot move, the hydraulic cylinder is not sensitive (blocking phenomenon), and the hydraulic cylinder crawls. To choose a hydraulic cylinder, in addition to the basic conditions: 1, inner diameter 2, stroke 3, working pressure, 4, installation form, the following conditions need to be met: A. When the load speed of the hydraulic cylinder reaches the standard or higher, a hydraulic cylinder with buffer fluid is required. Or in order to achieve higher speeds, it is necessary to install a reduction valve outside the hydraulic cylinder. B. Choose hydraulic oil and oil seal carefully. Different hydraulic oils are used for oil seals of different materials to ensure the service life of the hydraulic cylinder.
Now some manufacturers are working hard to reduce costs. The piston rods are not tempered, the rods are not electroplated, the cylinder finish is not enough, and the guide sleeve is not used for copper, but the ductile iron is changed. Although the cost is reduced, the quality of the hydraulic cylinder is not desirable. of. In order to fully meet the requirements of users, in addition to the above two factors, hydraulic cylinders must be used and maintained regularly. Before use, the gas cylinder should be deflated. The buffer control valve should be adjusted to a reasonable position. The cleanliness of the oil should be checked regularly. The dust on the cylinder should be cleaned regularly. Pay attention to waterproof and fireproof. In the past two decades, my country's hydraulic industry has developed rapidly, and hydraulic cylinders can completely replace imports. According to our experience, domestic cylinder manufacturers have completely passed the customs. The key is the seal. Domestic seals cannot completely replace imports, so we recommend important applications.
The phenomenon that the hydraulic cylinder cannot be moved often occurs on the hydraulic cylinder that has just been installed. In order to eliminate this defect, we must first find the reason from the outside of the hydraulic cylinder: whether the hydraulic cylinder exhibits excessive resistance to moving parts, whether it is stuck, wedged or hit other parts; whether the inlet pressure reaches the specified value. After eliminating the external factors, further check the internal causes of the hydraulic cylinder and take corresponding measures.
