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在批林批孔运动推动下,在厂党支部的领导下,为了确保产品质量,提高检查工作效率,我们自制了3W-0.9/7型空气压缩机活塞、轴承盖、气缸、曲轴、曲轴箱、连杆的专用检具。这些检具基本解决了主要零件几何精度和表面位置的测量问题。现将检具的结构与使用方法介绍如下:活 塞 检 具用于检测活塞销孔中心线与活塞中心线的不垂直度（图1）。该检具利用活塞外圆柱面为测量基准面,由V型铁定位,活塞销孔内配以适宜的量棒,采用微差法直接测量。
Under the motto of “Bailong Kong”, under the leadership of the factory party branch, in order to ensure product quality and improve inspection efficiency, we made 3W-0.9 / 7 air compressor piston, bearing cap, cylinder, crankshaft, crankcase , Connecting rod special gage. These gages basically solve the measurement problem of geometric precision and surface position of the main parts. Now the seizure of the structure and the use of methods are described below: Piston fixture for detecting the piston pin hole centerline and piston center line of non-perpendicularity (Figure 1). The gage Piston cylindrical surface for the measurement of the reference plane, the V-shaped iron positioning, piston pin hole with the appropriate amount of rods, using the direct method of differential measurement.