Treatment of foreign matter entering hydraulic oil cylinder

There are different types of hydraulic presses, such as single-column hydraulic presses, four-column hydraulic presses, servo hydraulic presses, etc., but their main power system is the same, that is, the cylinder. Hydraulic press in the process of operation may have foreign bodies into the hydraulic cylinder, foreign bodies into the cylinder need to be treated, otherwise it will affect the use of hydraulic press, for example, when the piston and cylinder sliding surface pressure abnormal rise, may cause sintering phenomenon, metal debris, scratch the cylinder wall, then how to solve this problem?

Foreign bodies in the cylinder are generally produced in this way:

1. When both ends of the pipe are threaded or welded, chips or welded foreign bodies are brought into the cylinder.

2, there are "burrs" on the parts, or insufficient scrubbing. There are often burrs left by drilling in the oil port or buffer device on the cylinder head, which should be paid attention to and installed after the sand grinding is removed.

3, cylinder body installation into the foreign body. Sometimes I enter the dust without knowing it. Before installation, the surrounding environment must be cleaned, and the place where the parts are placed should not be dusty.

4, the piston sliding surface on both sides of the general chamfer, the size of the chamfer and the surface finish should be strictly controlled otherwise the casting particles in the corner will be spalling during the sliding process, resulting in sliding surface loss.

5. The plunger of the buffer structure is tight or the transverse load on the piston rod is large.

6. The threaded connection pipe joint with the sealing belt is used. When tightened, the sealing line is inevitably cut off and brought into the pipe into the cylinder.

When there is a foreign body in the hydraulic cylinder, if the outer side of the sliding surface of the piston is equipped with a seal with a lip edge, then the lip edge of the seal will scratch the foreign body when the hydraulic press is working, which is beneficial to avoid scratching. However, the piston equipped with 0-shaped sealing ring has a sliding surface at both ends, and foreign bodies are sandwiched between this sliding surface, which is easy to form scars.