Cutting machine in cutting process, the cutting head and the distance of the workpiece and the verticality of the nozzle and the workpiece surface is two very important factors.
Directly affect the machining quality, so in order to improve the cutting quality, reduce scrap, need some special sensors on cutting head installation to ensure the quality of its cutting can produce consistent, and can increase process safety.
the cutting head in the shape change and surface uneven obstacle, sensor automatically detects and according to the changes automatically adjust the height, make it consistent with the distance on the surface of the workpiece can always faster processing materials instead of continuous supervision and today is the capacitive displacement sensor are basically used at home and abroad, its structure and shape corresponding to the processing head, at the same time with a detection signal processing unit.
displacement measurement is one of the most basic work, whether to contact with the workpiece to be measured in accordance with the sensor, displacement sensor can be divided into two types, contact and non-contact, compare with non-contact sensor and non-contact sensor in the guarantee of high resolution at the same time, with fast dynamic response and low hysteresis error, even to zero.
non-contact sensor, sometimes called close to the sensor, the application of the first close to switch, the tested object and sensitive probe close to a certain distance, the switching signal is given, the current close to the sensor have been developed to not only can detect the presence of object, and can give the object distance sensitive probe, and can provide information about the workpiece shape and space position.
because the cutting machine can be used to measure the displacement of moving object, so this kind of sensor is also known as non-contact displacement sensor, displacement sensor is commonly used with hysteresis expansion displacement sensors, electric eddy current displacement sensor, capacitive displacement sensor, inductance displacement sensor etc.
By the principle of various sensors, capacitance sensors sensitivity is high, has the following characteristics:
1, good dynamic response, due to the electrostatic attraction between the plate is very small, need little role in energy, and the movable part can do a small thin, so its inherent frequency is very high dynamic response time is short, can work under a few MHZ frequency, especially suitable for dynamic measurement.
2, simple structure, strong adaptability, easy manufacturing, easy to guarantee the high precision, can be made small size sensor, in order to realize the special measurement, can work in high and low temperature, strong radiation and strong magnetic field in the bad environment, such as can bear high pressure, high impact, overload, etc.
3, small heat, its temperature coefficient is small, because the capacitance value of the capacitance sensor has nothing to do in the electrode material, low temperature coefficient of the material can be selected, under the condition of the ambient temperature stability, can guarantee a good stability.
4, a larger relative variation is only limited by the linear area, its value can reach one hundred percent or more, can guarantee the sensor resolution and measurement range.
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