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根据《汽车起重机和轮胎起重机产品质量分等》JB/SQ-87的规定,对吊臂必须检测腹板及盖板的平面度,吊臂轴线在垂直平面和水平平面内的直线度等项形状误差。图1是QY8型汽车起重机伸缩臂的示意图,其盖板和底板的平面度公差为2mm,吊臂轴线在垂直平面和水平平面内的直线度公差均为4mm。上述形状误差的测量,通常是在大型平板上用等高垫块、长钢尺和厚度塞尺等检具来完成的。下面介绍一种既不需要大型平板,而
According to the provisions of JB/SQ-87 of “Production Quality of Truck Cranes and Tire Cranes”, the boom must detect the flatness of the web and the cover plate, and the straightness of the boom axis in the vertical and horizontal planes, etc. error. Fig. 1 is a schematic diagram of the telescopic boom of the QY8 truck crane. The flatness tolerance of the cover plate and the base plate is 2mm, and the straightness tolerance of the boom axis in the vertical plane and horizontal plane is 4mm. The measurement of the above-mentioned shape error is usually performed on a large-sized flat plate using a height gauge pad, a long steel ruler, and a feeler gauge. Here is a description of a large tablet that does not require