The source of impurity in the gas source of the coordinate measuring machine

The source of impurities in the air source of the coordinate measuring machine

　　 The normal operation of the coordinate measuring machine is inseparable from the air bearing, so compressed air is required. The quality of compressed air directly affects the normal operation and service life of the coordinate measuring machine, so air source treatment is particularly important. Generally speaking, the impurities in the gas source of a coordinate measuring machine mainly come from: impurities inhaled from outside the system through air compressors, impurities generated inside the system, impurities generated during system installation and maintenance, etc.

　　 is not ideal because the gas source contains a considerable amount of impurities, which are mainly divided into three categories, namely water, oil, and dust, of which about 80% are less than 2μm in size, The suction filter of the air compressor is unable to eliminate it. In addition, the inside of the air compressor system will continue to produce wear debris, rust residue and oil carbides, which will accelerate the wear of the air-consuming equipment, leading to seal failure or blockage.

　　Moisture

　　 The relative humidity in the atmosphere is generally as high as 65%. After being compressed and condensed, it becomes wet and saturated air with a large amount of liquid water droplets. They are pipes, valves, The root cause of the corrosion of equipment such as coordinate measuring machines, freezing in winter will also block the small holes in the pneumatic system. It is worth noting that even if it is separated and clean pure saturated air, as the temperature decreases, condensed water will still precipitate. About every 10 ℃ decrease, its saturated water content will drop by 50%, that is, half of the water vapor is converted into Liquid droplets.

　　oil

　　 compressor types are divided into piston type and screw type; most air compressors use lubricating oil to lubricate and cool their moving parts (such as screw, piston, etc.) Yes, but it pollutes the compressed air. In the air compressor, the lubricating oil is in direct contact with the high-temperature compressed air, and the oil stains in the compressed air exist in three forms: 'oil dropletsThe oil brought from the compressor to the gas supply system is not beneficial in any case.

　　 Three-coordinate measuring machine is a precision measuring instrument. It adopts air bearing guidance to achieve no friction and wear between the guide rails, and can maintain long-term performance uniformity. The high-pressure gas enters between the working surface and the guide rail surface through the small air holes in the air bearing to form a uniform air gap. The normal working air gap of the air bearing is between 3 and 10 μm. Therefore, under normal pressure conditions, ensuring the purity of the compressed air and the flatness of the guide rail surface is the key to the normal operation of the air bearing.