According to failure phenomena for hydraulic cylinder motion, judge the servo valve core had a shaking action in the process of action, the reason can be divided into two most, electrical and mechanical. Due to electrical fault processing faster, for maintenance as soon as possible, so start from electrical processing. 1. Poor contact attachment. Signal circuit hardware failures occur, the servo amplifier circuit hardware fault and other reasons. Through inspection, can rule out the possibility of control signal string into the ac signal, terminal no loose phenomenon, the attachment no poor contact, replacement of hardware circuit module and servo signal amplification circuit of hardware module, fault phenomenon, still use oscilloscope measurement, signal is normal. At this point, the basic rule out electrical part of the fault. 2. Hydraulic parts, respectively, in turn, rule out the possibility of the following faults: oil pipe and oil cylinder with air, hydraulic oil pollution, the serious leakage in cylinder, control oil and primary oil pressure is not stable. Finally as servo valve body of failure. Boot up normally. After disassemble, found that the magnet torque motor and armature gap has a lot of scrap metal, is equal to the reduced the armature in the median of each air gap length g. Conclusion according to the analysis of the hydraulic control system: when | | x/g & gt; A third ( X for the end deviation of armature displacement) The armature is always unstable. So that the metal scrap in the hydraulic system is adsorbed on the permanent magnet, reduced the air gap length g, destroy the original static characteristic, torque motor is the root cause of the failure. Maintenance measures aiming at the fault reason, and the analysis of the other possible, take the following measures: 1. Regularly replace the oil filter, clean up oil deterioration due to the fault caused by metal contamination in the hydraulic oil, so regular replacement of the system in the oil filter, drop in oil, oil filter can prevent dirt from entering the servo valve, effectively prevent failure, prolonged the running of the servo valve. Torque motor and the guide valve completely soaked in the oil and oil return are interlinked, the blind end of the position and in the pipeline, so it's the oil flow, hardly easy oxidation, so need to release the metamorphism of the hydraulic oil regularly. 2. , oil cylinder, such as wear, will produce some scrap metal, they will reduce the quality of the hydraulic oil, cause of failure. According to the hydraulic oil in recent years, the use of cycles and oil test results, to once every 10 months to replace the hydraulic oil, to ensure no unplanned downtime. 3. Replaced periodically servo valve is the immediate cause of the malfunction is pollution cause for torque motor servo valve action is bad, so regular cleaning, replacement of torque motor and the guide Industrial Valves, prevent pollution, and thus put an end to failure. The servo valve installation shall be carried out as much as possible in a clean environment, operation should be removed from the electrical signal on the servo valve, and removing the hydraulic system pressure, then remove the servo valve. In a clean, consistent commercial solvent cleaning all parts, parts can be dry or with a soft tube to clean, dry air is blown dry. After cleaning the servo valve, which can be used as spare parts in turns, reduce the cost. 4. Change regularly check the electrical signal, tighten terminals, prevent loose, check the attachment, to prevent the poor contact servo valve is made of precision mechanical and electrical integration products, high precision and is sensitive to pollution, it is in maintenance, cleaning, and to meet the requirements of the recognition of the importance of maintenance work is very high, must cause enough attention in the practical use.
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