How to inspect the hydraulic press system in Foshan? How to change the hydraulic oil?     

We can inspect the hydraulic press system in Foshan in this way:

1. Find hydraulic failures according to the Foshan hydraulic press. When analyzing and troubleshooting Foshan hydraulic press failures, the main method is to "catch both ends", that is, to catch the power source (oil pump) and the actuator, and then "connect the middle", that is, the pipelines and control components passed between the power source and the actuator. When "catching both ends", analyze whether the Foshan hydraulic press failure is in the oil pump, oil cylinder, or motor itself. When "connecting the middle", pay attention not only to analyzing whether the failure is in the hydraulic components on the connecting road, but also to clarifying which control method is used when the system switches from one working state to another, and whether the control signal is correct. Check the physical objects one by one, and pay attention to whether there is any misconnection between the main oil roads and between the main oil road and the control oil road, causing mutual interference. If there is mutual interference, analyze how the leveling error is used.

Cause-and-effect analysis can closely combine maintenance management and fault finding, so it is widely used.

II. Fault diagnosis and condition monitoring of Foshan hydraulic press

Ferrography is based on the wear of mechanical friction pairs. With the help of a ferrograph, wear particles and other contaminant particles in the hydraulic oil are separated out to produce a ferrogram, which is then observed under a ferrographic microscope or scanning electron microscope, or deposited in a glass tube according to its size, and then quantitatively detected by optical methods. Through the above analysis, important information about wear in the system can be accurately obtained. Based on this, the wear phenomenon is further studied, the wear state is monitored, the fault precursor is diagnosed, and the system fault prediction is made.

Foshan hydraulic press maintenance:

1. Recommended working oil is No. 32 and No. 46 anti-wear hydraulic oil, with oil temperature in the range of 15 ~ 60 degrees Celsius.

2. The oil can only be added to the tank after strict filtration.

3. The working oil should be changed once a year, and the initial replacement time should not exceed three months;

4. The slider should be lubricated frequently, the appearance of the column should be kept clean, and oil should be sprayed before each operation.

5. Under the nominal pressure of 500T, the allowable eccentricity of the concentrated load is 40mm. Excessive eccentricity can easily lead to column strain or other adverse phenomena.

6. Check the pressure gauge every six months;

7. If the machine is left unused for a long time, the surfaces of all parts should be cleaned and coated with anti-rust oil.

During the use of Foshan hydraulic press hydraulic oil, due to mechanical, physical and chemical effects, it will always age and deteriorate faster or slower. When the quality of the working fluid decreases to the point where it does not meet the requirements of the index, it needs to be replaced in time.

Once the Foshan hydraulic press hydraulic oil is produced, it will gradually deteriorate. During long-term storage, particulate contaminants in the oil tend to agglomerate. During transportation, if the Foshan hydraulic press is subjected to vibration, it will also produce the aggregation of tiny particles. After being added to the hydraulic system, the fission rate will be greatly accelerated. Taking mineral oil hydraulic oil as an example. More than 96% of the components are hydrocarbons, one hydrocarbon, and the rest are sulfur, nitrogen and ash. Various additives such as antioxidants, anti-wear agents, rust inhibitors, antifoaming agents and pour point depressants are also added as needed.

During use, due to external factors such as air, moisture, impurities, heat, light, and mechanical stirring, as well as internal factors such as the chemical composition of the single-column Foshan hydraulic press and hydraulic oil and the properties of additives, various physical and chemical changes will occur, and the hydraulic oil will gradually age and deteriorate.

There are three ways to determine the oil change cycle of the Foshan hydraulic press:

1) Regular visual inspection. Maintenance personnel will regularly sample and observe, or conduct simple analysis before deciding whether to change the oil. It also depends on personal experience, but the basis is insufficient.

2) Regular oil change. This is the common method used in factories at present. However, it deviates from the actual situation of the aging and deterioration of hydraulic oil during use, and does not consider the actual working premise of frequent use of the Foshan hydraulic press, which is biased towards experience and unscientific.

3) Based on the results of oil sample tests to define the oil change index and determine whether to change the oil is a scientific and fair method. However, there is no uniform oil change index yet.