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       <h1 class="ny_newsdetail_title">流速仪常见故障排除</h1>
       <div class="ny_newsdetail_tips">更新时间：2016-07-22&nbsp;&nbsp;|&nbsp;&nbsp;点击率：3067</div>
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          <strong><span style="font-size: larger;">流速仪</span></strong><span style="font-size: larger;">常见故障排除<br />&nbsp;&nbsp;&nbsp; 旋浆式水流测速仪是我国使用较普遍的以旋浆作为感应元件的水文仪器，在一般河流、渠道、水库等水断面中测定测点的水流平均速度，从而确定断面的流量，是传统可靠的测流水文仪器。 现将日常使用的常见故障及排除方法介绍。&nbsp;<br />&nbsp;&nbsp;&nbsp; 一、<strong>水流测速仪</strong>在测量时精度不准。&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br />&nbsp;&nbsp;&nbsp; 流速仪使用时，如发现旋转部件松动，或轴向窜动，浆套与轴间隙过大，应立即停止使用，进行检验。&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br />&nbsp;&nbsp;&nbsp; 旋转部件松动或轴向窜动，可能的故障原因有以下三种：一是锥端紧定螺丝过松，未上紧旋桨轴，使旋桨轴部件轴向窜动。在测流时，因锥端紧定螺丝未卡死在旋浆轴槽内时，有可能使整个旋转部分与身架脱落。若有此现象，仪器不能下水测流，必须紧固螺丝调整好仪器。二是并紧螺钉未上紧，使球轴承间间隙过大，影响测流精度，遇此情况，需要拆卸仪器，紧固好并帽螺钉。三是旋转部分装配间隙，即浆套与轴承之间的间隙不适，或过大或过小，影响测理论基础，遇此情况需重新调整。&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br />&nbsp;&nbsp;&nbsp; 二、</span><strong style="font-size: 14px;">水流测速仪</strong><span style="font-size: larger;">转动不灵，低速测流不准。&nbsp;&nbsp;&nbsp;&nbsp;<br />&nbsp;&nbsp;&nbsp; 排除方法：检查旋转部分，手拿身架，用嘴轻吹浆叶，将叶应转动灵活，无摩擦或卡阻现象，如有上述现象应重新清洗。仪器重新安装时应注意外隔套的装配间隙，即外隔套在两轴承之间的窜动量为 0.03 -0.05mm，不得过紧或过松。旋转部件装配间隙，即浆套与轴承之间装配的间隙要求为 0.3 -0.4mm。&nbsp;&nbsp;<br />&nbsp;&nbsp;&nbsp; 三、</span><strong style="font-size: 14px;">水流测速仪</strong><span style="font-size: larger;">无信号或信号时有时无。<br />&nbsp;&nbsp;&nbsp; 排除方法首先检查计数器、音响是否正常，如正常，则检查流速仪的传信机构。用双股胶质线将流速仪信号输出和计数器信号输入端连接好，转动浆叶，一个信号长度为 3转左右，否则应重新调整接触丝，如无信号，可能是接触丝因电流过强而烧断，应更新接触丝。信号时有时无，则应调整接触丝，使其适度地压位接触销。调整时应注意，过紧会影响其灵敏，过松则会接触不良，调整接触丝使一个信号的连续时间为旋浆转动 3转左右，应将接触丝的悬空部位略向下成弧形。接触丝和接触销上如有氧化物，会影响电路的接通，因此应拆洗，除去氧化物。&nbsp;&nbsp;&nbsp;&nbsp;<br />&nbsp;&nbsp;&nbsp; 流速仪使用后，应仔细清洗和加油，妥善保护，在长期保存时，应特别注意每隔半年时间，应取出检查并加油，仪器连续工作时间为8小时，超时仪器应进行清洗，除去水、泥沙、污物等。</span>
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