The piston rod is a connecting piece that supports the piston to do work. It is mostly used for moving parts such as oil cylinders and air cylinders. It is a moving part with frequent movement and high technical requirements. Take a hydraulic oil cylinder as an example, which is composed of a cylinder tube, a piston rod (cylinder rod), a piston and an end cover. Its processing quality directly affects the life and reliability of the entire product. Everyone around us knows the application of piston rods. Today, the editor will give you an analysis of the reasons for the automatic extension of the piston rod.
1. Check whether the oil volume of the hydraulic oil tank is sufficient, but after taking out the oil inlet filter and the return oil filter, it is found that some iron filings are adsorbed on the main pump oil inlet filter; test the main pump output pressure, main pump working pressure and pilot The pressure is normal. Analysis believes that the noise generated during the operation of the main pump may be caused by the iron filings adsorbed by the oil inlet filter.
2. If the main safety valve is damaged, the entire system will not reach the normal working pressure, and the actions of all working devices should be abnormal. However, in the early stage of the machine failure, only the stick cylinder action is abnormal, which can preliminarily eliminate the main safety valve failure.
3. Disassemble the main control valve of the stick cylinder and find that the spool deviates from the neutral position, so that the main oil circuit is always in the open position; when the spool is taken out, it is found that the back suction is large and the spool is not easy to move; remove the oil circuit and take out the spool , The spool can move freely without being stuck.
4. The secondary pilot pressure output by the pilot control oil circuit is detected, and the pressure value is normal, and the pilot control valve failure can be eliminated. If the overflow valve of the main control valve port of the stick cylinder is damaged, the working oil path leading to the stick cylinder will not be able to build up pressure, and the stick cylinder will not work.
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