The principle and application field of pneumatic measuring instrument

he principle and application field of pneumatic measuring instrument

Pneumatic measuring instruments are devices that measure the length of a length using compressed air as a medium based on hydrostatic and hydrodynamic principles. The utility model has the advantages of wide application, high measurement precision, simple structure and convenient operation, and is particularly suitable for high-precision and large-volume workpiece measurement in the automobile industry. The special advantage of the pneumatic measuring instrument is that non-contact measurement can be achieved. In the measurement work, the measuring head is not in direct contact with the surface to be tested, which not only reduces the influence of the measuring force on the measurement result, but also avoids scratching the workpiece to be tested. The measuring principle of a pneumatic measuring instrument is a comparative measuring method. The measurement method is to convert the length signal into a gas flow signal, and the floating mark value in the graduated glass tube is called a buoy type pneumatic measuring instrument; or the gas signal is converted into an electric signal by a gas-electric converter. The indication value is called an electronic column pneumatic measuring instrument. The pneumatic measuring instrument is a multi-assembled measuring instrument. It can be used with different pneumatic probes to measure various parameters.

Pneumatic measuring instruments are widely used in the mechanical precision processing industry, especially in the mass production of automotive parts production testing, cold machine industry measurement, the measurement items are: inner diameter, outer diameter, groove width, two holes, depth, thickness, Roundness, taper, concentricity, straightness, flatness, parallelism, perpendicularity, air permeability and tightness.