What causes the locking piston rod to automatically extend?
Release time:
2020-06-06 12:00
Source:
Do you really understand the automatic extension of the piston rod? FollowMold clamping piston rodLet's find out together!
1. If the main safety valve is damaged, the entire system will not be able to reach the normal working pressure, and the operation of the working device should be abnormal. In the initial stage of this machine failure, only the boom cylinder movement is abnormal, so the main safety valve failure can be initially ruled out.
2. After removing the main control valve of the boom cylinder, it was found that the spool deviated from the neutral position, so the main oil passage was in the open position. When picking up the spool, it was found that the reverse suction was large, and the spool was difficult to move.
3. The secondary pilot pressure output from the pilot control oil circuit was tested, and the pressure value was also normal, so the pilot control valve failure can be ruled out. If the overflow valve at the main control valve port of the boom cylinder is damaged, the working oil passage leading to the boom cylinder will not be able to establish pressure, and the boom cylinder will not be able to move.
4. The oil level in the wave pressure oil tank was checked, but after removing the oil inlet and return oil filter cores, it was found that some iron filings were adsorbed on the main pump inlet oil filter core. The main pump output pressure was tested, and both the pump operation excitation and the special pressure were normal.
Summary of causes and solutions: The spool jamming should be related to the automatic extension of the piston rod. The seals in the boom cylinder may be severely damaged. Therefore, an internal leakage test was performed on the boom cylinder. The method is as follows: Restore the main control valve of the boom cylinder to its normal state. When the boom cylinder extends to the end of the stroke, remove the oil inlet hose with the rod cavity, and operate the pilot control valve after starting the engine. The handle allows the boom cylinder to continue to Enter the machine oil without the rod cavity, and observe whether the rod cavity is leaking oil. The test result is that a large amount of hydraulic oil flowed out from the oil port of the rod cavity, indicating that the seals in the boom cylinder were severely damaged. When checking the hydraulic oil tank, it was found that there were also a large amount of iron filings at the bottom of the oil tank. It is analyzed that after the boom cylinder is damaged, a large amount of iron filings are produced by scraping the inner wall and adsorbed onto the oil inlet filter core, resulting in insufficient oil supply when the main pump sucks oil, thus producing a howling sound.
The above isMold clamping piston rodIntroduction to some of the automatic extension of the piston rod, hoping to help everyone.
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Zhanwang Machinery Co., Ltd., Dongguan
Dongguan Zhanwang Machinery Co., Ltd. is a manufacturer and supplier of various precision mechanical parts, including rubber and plastic machinery parts, pneumatic and hydraulic machinery parts, precision shafts, piston rods, standard chrome-plated bars, guide columns, uprights, guide pillars, rollers, etc. We provide surface treatments such as super mirror polishing, hard chrome plating for different specifications of precision mechanical parts and various molds. We also offer additional surface treatments such as tempering, medium and high-frequency quenching, nitriding, and blackening for mechanical parts. Our factory is equipped with large CNC lathes, ordinary lathes, external cylindrical grinders, centerless grinders, and milling machines, enabling us to process and manufacture various special mechanical parts. We offer free pick-up and delivery with competitive Price.
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