In industrial production, hydraulic cylinders specifically designed for presses are key components for power transmission, and their stability and reliability are crucial for the operation of the entire production line. However, due to various factors such as the operating environment and methods, hydraulic cylinders inevitably encounter various faults during use. This article will discuss the common issues of hydraulic cylinders used in presses, along with fault diagnosis and repair methods.

1. Common Fault Types

Hydraulic cylinder cannot operate

Reason: It may be due to insufficient oil pressure at the inlet, internal leakage of the hydraulic cylinder, or excessive friction between the piston and the cylinder body.

Exclusion method: First, check the working pressure of the hydraulic system to ensure it meets the requirements for normal operation of the hydraulic cylinder; secondly, check the seals of the hydraulic cylinder, such as O-rings and piston rods, for wear or damage; finally, check the lubrication between the piston and the cylinder body, and add lubricant in a timely manner if necessary.

Hydraulic cylinder operates slowly

Reason: It may be due to the high viscosity of the hydraulic oil, the presence of air in the hydraulic system, or blockages inside the hydraulic cylinder.

Exclusion method: For the issue of high viscosity of hydraulic oil, replace it with hydraulic oil suitable for the current working temperature; for the presence of air in the hydraulic system, vent it using the exhaust valve; for blockages inside the hydraulic cylinder, disassemble the cylinder for cleaning.

Hydraulic cylinder leakage

Reason: It may be due to aging or damage of seals, or wear of components such as the hydraulic cylinder body and piston rod.

Exclusion method: First, check the seals, and if aging or damage is found, replace them in a timely manner; secondly, check the hydraulic cylinder body, piston rod, and other components for wear, and repair or replace them if necessary.

2. Fault Diagnosis and Repair Process

On-site Observation

When a fault occurs, the first step is to observe the working state of the hydraulic cylinder on-site to understand the specific situation of the fault phenomenon, such as whether the hydraulic cylinder cannot operate, operates slowly, or leaks.

Fault Analysis

Based on the observed fault phenomena, combined with the working principle and structural characteristics of the hydraulic cylinder, conduct a preliminary analysis of the fault causes to identify possible fault points.

Fault Diagnosis

By checking parameters such as pressure and flow of the hydraulic system, as well as the wear condition of seals, cylinder body, and piston rod of the hydraulic cylinder, conduct precise diagnosis of the fault causes.

Fault Repair

Based on the diagnosis results, take corresponding repair measures. For example, replace seals, repair or replace worn components, and clean the inside of the hydraulic cylinder. During the repair process, strictly follow the operating procedures to ensure repair quality.

Debugging and Testing

After the repair is completed, the hydraulic cylinder should be debugged and tested to ensure it can operate normally and meet production requirements. If problems are found, timely adjustments and handling should be performed.

3. Summary and Suggestions

The fault diagnosis and repair of hydraulic cylinders specifically designed for presses is a complex and important task. In practical operations, we should focus on the processes of observation, analysis, and diagnosis to ensure that we can accurately identify the causes of faults and take effective repair measures. At the same time, we should also strengthen the daily maintenance and upkeep of hydraulic cylinders, regularly check parameters such as pressure and flow of the hydraulic system, as well as the wear condition of seals, cylinder body, and piston rod, to timely discover and address potential issues, thereby improving the stability and reliability of hydraulic cylinders.