INA轴承中向心球轴承的鉴定技术状态正常的向心球轴承，其内、外圈滚道应无剥落和严重磨痕，并呈光亮的一条圆弧沟槽；所有的滚珠应保持圆形，表面点、裂纹和剥落；保持架不松散、不破碎、未磨穿。当用一只手持内圈，另一只手迅速轻推外圈旋转时，要求旋转平稳，只听到滚珠在滚道上滚动的轻微声响，无振动；停止时应逐渐减速，停后无倒退现象，正常的向心心球轴承，其内、外圈与滚动体之间的间隙为.5-.1mm，当沿径向晃动内外圈时，应感觉无间隙。
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严禁焊接火花掉进空压机，避免烧坏空压机内部件。主管路必须有1~2向下的倾斜度，以利管路中的冷凝水排出（管路应有排污螺堵，定期排污）。管路的口径应大于或等于压缩机排气口的管径。管路中尽量减少使用弯头及各类阀门，以减少压力损失。主管路不要任意缩小或放大，如果必须缩小或放大时须使用渐缩管，否则在接头处会有紊流情况发生，导致大的压力损失，同时由于气体的冲击压力，管路的寿命会大大缩短。支线管路必须从主管路的顶端引出，避免主管路中的冷凝水沿管路流至机器中。
