Calibration device for volume expansion measurement instrument of solid

Abstract

The invention relates to a calibration device for a volume expansion measurement instrument of solid, and the device is provided with a hollow pedestal which is fixed on a front wall of a testing cavity of the expansion measurement instrument. The joint of the pedestal with the wall of the testing cavity of the expansion measurement instrument is sealed in a form of a static sealing structure through a second annular sealing ring. The cavity of the pedestal is provided with a first annular sealing ring in a sleeved manner. A rear screw of a pair of spiral micrometer heads is inserted into thecavity of the pedestal in a form of a moving sealing structure through the first annular sealing ring, and then the rear end of the screw is enabled to enter the testing cavity of the expansion measurement instrument in a threaded manner. The front parts of the spiral micrometer heads are provided with ratchet wheels, and the rotation of the ratchet wheels can drive the rear screw of the spiral micrometer heads to make reciprocating motion in the axial direction of the cavity of the pedestal. According to the invention, the internal environment of the testing cavity of the expansion measurement instrument is not changed before and after calibration, and the volume calibration can be carried out according to the needs. The device achieves the repeated calibration, and controls the random error. The device also has the capabilities of increasing the volume and reducing the calibration.

Description

technical field [0001] The invention belongs to the technical field of measuring equipment, and its core is to provide a traceable solid volume expansion measuring instrument that does not affect the measurement, can be adjusted multiple times, can be positively and negatively adjusted (that is, provides volume increase standards and volume reduction standards), and is traceable. Calibration device. Background technique [0002] The expansion characteristic refers to the characteristic that the volume of the material changes (increases or decreases) under environmental loads such as temperature and pressure, and external force loads such as tension and pressure. In engineering applications, the expansion characteristics of solid materials are one of the mechanical properties of materials that must be considered. The method to obtain the volume expansion characteristics is: measure the volume expansion of the material under load conditions (that is, the volume increase or de...

AI Technical Summary

Problems solved by technology

The problems of the above-mentioned calibration device and calibration method are: firstly, during the calibration and measurement process, the opening and closing of the test chamber causes the state (mainly volume) of the liquid or gas medium in the test chamber to change before and after calibration, and the measurement results are not traceable; secondly , each standard block can only provide a known volume standard for calibration, whether using multiple standard blocks for multiple calibrations or only for single-point calibration, it is easy to introduce random errors; finally, the volume standard block is generally only Can be calibrated for volume increase, not for volume decrease

Images