Temperature sensor used for numerical control machine tool thermal error test

Abstract

The invention provides a temperature sensor used for a numerical control machine tool thermal error test. The temperature sensor comprises a neodymium iron boron magnetic shell, a circuit board, a temperature sensing chip and a twisted-pair double-shielding cable wire. The circuit board is fixed in the middle part of the internal cavity of the neodymium iron boron magnetic shell. The temperature sensing chip is welded at the lower side surface of the circuit board and connected with the bottom part of the neodymium iron boron magnetic shell, and high-thermal-conducting glue is smeared on the bottom part. The internal side of high-thermal-conducting glue is fit with the temperature sensing chip, and the external side is attracted on the temperature sensitive points of a numerical control machine tool via the neodymium iron boron magnetic shell. The twisted-pair double-shielding cable wire penetrates through the neodymium iron boron magnetic shell and is welded on the circuit board. Resin used for thermal insulation fully fills the gap of the internal cavity between the temperature sensing chip and the circuit board and the neodymium iron boron magnetic shell. Temperature measurement is performed on the temperature sensitive points of the numerical control machine tool by the temperature sensing chip via high-thermal-conducting glue. The circuit board transmits temperature signals to the outside via the twisted-pair double-shielding cable wire. The temperature sensor used for the numerical control machine tool thermal error test has advantages of being convenient and reliable in installation, high in precision, great in stability, high in anti-interference and suitable for measurement of temperature of the thermal sensitive points of the numerical control machine tool thermal error test.

Description

technical field [0001] The invention relates to a temperature measuring device, in particular to a temperature sensor for thermal error testing of a numerically controlled machine tool, which belongs to the technical field of measurement. Background technique [0002] To improve machining accuracy, the most economical and effective method is to compensate the thermal error of the machine tool in real time, and the prerequisite for thermal error compensation is to be able to test the temperature value of the thermal sensitive point of the machine tool in real time, accurately and reliably, which is inseparable from the Open high-precision and high-stability temperature measuring elements. [0003] The temperature sensors used on CNC machine tools can be roughly divided into two categories: analog temperature sensors and digital temperature sensors. The analog temperature sensor needs to perform signal transmission processing and A / D conversion, requiring both the temperature...

AI Technical Summary

Problems solved by technology

If the temperature of the cold end changes, it will seriously affect the accuracy of the measurement

Therefore, certain compensation measures must be taken at the cold end to eliminate the influence of temperature changes at the cold end, but accurate cold end compensation is very difficult to achieve

Thermal resistance type analog temperature sensor measures temperature based on the characteristic that the resistance of metal conductors increases with the increase of temperature. Platinum resistors are commonly used as temperature sensing elements, and the test range is 0-650°C. There is a nonlinear problem in the ℃ range, which is not suitable for machine tool temperature testing; in addition, thermal resistance sensors have a certain attenuation, that is, as time increases, their resistance-temperature proportional relationship will gradually decay and change, and regular recalibration is required. More cumbersome to implement

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