译文：
在生产实践过程中笔者发现，生产玻壳的自动压机冲压油缸在动作过程中出现颤抖现象，并且颤抖动作时强时弱，但基本能够完成全部动作。控制系统采用OILGEAR公司的SC-VP系列的电液伺服阀，其结构为永磁式力反债两级伺服阀．工作压力为9MPa。 原因分析 根据故障现象为液压油缸动作不良，判断出伺服阀阀芯在动作过程中有颤抖动作，其原因可分为电气和机械两大部分。因电气故障处理较快，为尽快维修，故从电气处理开始。 1、电气部分 设为电气部分出现故障，则有可能为控制信号串人交流信号、接线端子松动．连线接触不良。信号发生回路硬件故障，伺服放大回路硬件故障等原因。经检查，可以排除控制信号串入交流信号的可能，接线端子牢固无松动现象，连线无接触不良，更换信号发生回路硬件模块和伺服放大回路硬件模块，故障现象依旧，采用示波器测量，信号正常。至此，基本排除电气部分故障。 2、液压部分 分别依次排除以下故障的可能性：油压管道和油缸内有空气、液压油污染、油缸内漏严重、控制油路和主油路压力不稳定。{zh1}认定是伺服阀本体故障。更换伺服阀先导部分．开机正常。 经拆开检查，发现力矩马达导磁体与衔铁缝隙中有许多金属屑，相当于减小了衔铁在中位时的每个气隙长度g。根据《液压控制系统》的分析结论：当|x/g |>1／3时(x为衔铁端部偏离中位的位移)，衔铁总是不稳定的。因此认为液压系统中的金属屑被吸附在永磁体上，减小了气隙长度g，破坏了力矩马达原有的静态特性，是本次故障的根本原因。 维护措施 针对本次故障原因，以及分析的其他可能，采取了以下措施： 1、定期更换油路滤芯，清理变质油 由于此次故障由液压油中金属污染造成，因此定期更换该系统油路中的滤芯，放掉滤油器中存油，可防止污物进入伺服阀，有效的防止故障发生，延长伺服阀的运行时间。 力矩马达和先导阀xx浸泡在与回油相通的油液里，位置又处于管道的盲端，所以该处的油液几乎不流动，易氧化变质，因此需定期放掉变质的液压油。 2、定期更换液压油，加强液压油的管理 液压油在长期工作中会氧化焦化，并且液压系统中的泵．阀、油缸等的磨损，会产生一些金属屑，它们会降低液压油的品质，造成故障。根据近几年液压油使用周期和油品化验结果，要每10个月更换一次液压油，才能保证设备无计划外停机。 3、定期更换伺服阀 此次故障的直接原因为力矩马达被污染导致伺服阀动作不良，因此定期清洗、更换力矩马达和先导阀，防止污染，从而杜绝故障发生。伺服阀的装拆应在尽可能干净的环境中进行，操作时应先去掉接到伺服阀上的电气信号，再卸掉液压系统的压力，然后拆下伺服阀。在干净、相容的商用溶剂中清洗所有的零件，零件可以晾干或用软气管以洁净、干燥的空气吹干。清洗后的伺服阀，可以作为备件轮流使用，降低费用。 4、定期更换检查电气信号，紧固接线端子，防止松动，检查连线，防止接触不良 伺服阀是精密制造的机电一体化产品，精度极高，对污染十分敏感，它在维护、清洁及对维护工作重要性的认识等方面的要求非常高，在实际使用中一定要引起足够的重视。

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原文：
Of practice in the production process I found that the production of automatic presses stamping glass tank in the action occurred during shaking phenomenon, and the shaking movements with strengths and weaknesses, but the basic be able to complete all the action. Control system uses OILGEAR the company's SC-VP series of electro-hydraulic servo valve, the structure of permanent magnet servo valve edge anti-debt levels. Working pressure 9MPa. Analysis According to the hydraulic cylinder moves Failure poor judge the servo valve spool in the action in the process of shaking movements, its causes can be divided into two parts, electrical and mechanical. Due to electrical fault handling faster repairs as soon as possible, so starting from the electrical treatment. 1, electrical part of the Make electrical part fails, it is possible to control the signal string of human communication signal, terminal block loose. Connection being exposed. Signal loop hardware failure, servo loop amplification hardware failures and other reasons. The inspection control signal can be ruled out the possibility of string into the AC signal, terminals firmly without loosening the connection without being exposed, the replacement signal amplification loop servo-loop hardware modules and hardware modules, fault phenomenon remains the same, using oscilloscope measurements, the signal to normal . At this point, the basic rule out the electrical part of the fault. 2, hydraulic part of the Respectively, followed by failure to exclude the following possibilities: hydraulic pipes and the fuel tank with air, hydraulic oil pollution, the fuel tank of a serious leak, control oil line and the main oil line pressure instability. Finally that it is the servo valve body malfunction. The pilot part of the servo valve replacement. Boot normal. On opening, it was discovered torque motor magnet and armature guide there are many cracks in the metal shavings, equivalent to reducing the armature in place when the length of each gap g. According to "hydraulic control system" analysis of the conclusions: When | x / g |> 1 / 3 Shi (x for the armature end of the displacement deviation from the median), the armature is always unstable. Therefore considered that the hydraulic system of the metal shavings were adsorbed on the permanent magnet, the reduced air gap length g, destroyed the static torque characteristics of the original motor, is the root cause of this failure. Maintenance measures Reasons for this failure, as well as analysis of other possible, has taken the following measures: 1, regular replacement of oil circuit filter, clean oil deterioration The failure by the hydraulic oil due to metal pollution, so periodic replacement of asphalt in the filter of the system, let go keep the oil in oil filter to prevent dirt into the servo valve and effective to prevent the failure occurred, to extend the servo valve the running time. Torque motor and the pilot valve completely immersed in the oil and return oil interlinked, the position they are in dead-end pipe, so there's almost no flow of oil, easily oxidized bad, therefore need to let go deterioration of hydraulic oil on a regular basis. 2, periodic replacement of hydraulic oil, hydraulic oil to enhance the management of Hydraulic oil in the long run will work, oxidation of coking, and the hydraulic system pump. Valves, cylinder wear, etc., will produce some metal shavings, they will reduce the quality of hydraulic oil, resulting in failure. According to recent years, the use of hydraulic fluid cycle and the oil test results, to be replaced once every 10 months, hydraulic oil, in order to ensure that equipment outside unplanned downtime. 3, regular replacement of servo-valve The direct cause of failure for the torque motor servo valve moves the contaminated lead to bad, so regular cleaning, replacement torque motor and the pilot valve to prevent pollution and thereby eliminate the failures occurred. The Assembly and Disassembly servo valve clean environment should be carried out as far as possible, the operation should first remove the servo valve on the receipt of electrical signals, and then relieved the pressure of the hydraulic system, and then remove the servo valve. In a clean, compatible with commercial solvent cleaning all the parts, components can be dry or soft trachea with clean, dry air drying. After cleaning the servo valve can be used as spare parts rotate to reduce costs. 4, periodic replacement to inspect an electrical signal, fastening terminal block, prevent loosening, check the connections to prevent the poor contact Servo valve is precision-made mechanical and electrical integration products, high precision, is sensitive to pollution, which in the maintenance, cleaning and maintaining awareness of the importance of requirements is very high, in actual use must be taken seriously enough .