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中原量仪厂生产的QFP型浮标式气动量仪本体(以下称量仪),它的测量原理,是将长度尺寸的变化转换成气体流量变化,气体流量通过锥度玻璃管内壁间的环型间隙,流到气动测量头的喷嘴,从喷嘴孔端面和被测工件间的间隙逸入大气(图1)。因此,当被测工件尺寸变化使喷嘴与被测工件间隙变化时,锥度玻璃管内气体流量变大,浮标的位置升高,反之,间隙变小时,浮标位置降低,根据浮标位置的高低,即可在刻度尺上将被测工件的尺寸误差表示出来,从而
The QFP buoy type pneumatic measuring instrument body (hereinafter weighing instrument) produced by Zhongyuan measuring instrument factory transforms the change of the length dimension into the change of the gas flow rate, and the gas flow passes through the annular gap between the inner walls of the tapered glass tube , Flows to the nozzle of the pneumatic measuring head and escapes into the atmosphere from the gap between the end face of the nozzle hole and the workpiece under test (Figure 1). Therefore, when the measured workpiece size changes so that the gap between the nozzle and the workpiece changes, the taper of the glass tube gas flow becomes larger, the buoy position increases, on the contrary, the gap becomes smaller, the buoy position decreases, according to the height of the buoy position, The scale will be measured on the workpiece size error expressed, thus