Wide-range high pressure resistant wire type strain gauge

Abstract

The invention relates to a wide-range high pressure resistant wire type strain gauge which comprises a cable sealing component (1), a protecting casing sealing component (2) and a wire type sensitive component (3). The wire type sensitive component (3) is subjected to effective multiple sealing protection through the cable sealing component (1) and the protecting casing sealing component (2), the cable sealing component (1) is used for protecting a cable and enables a cable joint to be sealed in the protecting casing sealing component (2), and the wire type sensitive component (3) is located in the protecting casing sealing component (2). According to the wide-range high pressure resistant wire type strain gauge, structures of both a sensitive component and a sealing component of a traditional vibrating wire type strain gauge are modified, and the problems that the strain gauge is subjected to limitation of small wire core strain capacity of the sensitive component and is insufficient in water pressure resistance are solved.

Description

technical field [0001] The invention relates to a large-scale high-voltage resistant string strain gauge. Background technique [0002] The large-range high-voltage resistant vibrating wire strain gauge is mainly used in the monitoring points with large corresponding variables in the Gaoku Dam for automatic safety monitoring. It can also be used in other occasions that need to measure large strains, such as multiple Strain strain monitoring of steel cables, etc. [0003] At present, the vibrating wire strain gauge is mainly composed of three parts: the shell sealing part, the string core part, and the string core measurement part, such as figure 1 As shown, the string core part is mainly composed of a tensioned steel string, the steel string is located inside the protective shell, and its two ends are respectively fixed on the flange covers at both ends of the protective shell. The core measuring part is located outside the protective case. When in use, fix the flange cov...

AI Technical Summary

Problems solved by technology

[0004] At present, the main disadvantages of string strain gauges are: 1) The measurement range of string strain gauges is small: the steel strings of existing string strain gauges are directly connected to the flange covers at both ends, and the strain of the measured object directly acts on the steel strings. On the string, the strain of the steel string itself is extremely limited, generally only about 2000 micro-strains, beyond this range, the steel string is prone to plastic deformation, and in severe cases it will be broken, resulting in damage to the instrument

Therefore, the measurement range of the existing string-type strain gauge is relatively low. Once a large range of strain measurement is encountered, the existing string-type strain gauge will not be able to meet the demand for a wide range of strain measurement range; 2) the string-type strain gauge is sealed Poor water resistance: At present, such problems generally exist in domestic string strain gauges

The string core measurement part of the existing string strain gauge is located outside the protective shell, and its excitation part and measurement part are mainly wrapped and sealed by epoxy glue, and the lead-out cable is also mainly wrapped and sealed by epoxy glue. The joints between the glue and the measuring parts and cables are prone to the problem of seal failure, the water pressure resistance is low, and the sealing effect is poor, which cannot meet the requirements of the monitoring part for high water pressure resistance. Poor stability: due to the harsh environment in which the product is used, the external interference is complex and changeable, whether it can effectively reduce the external interference, and under the action of a certain over-range water pressure, the instrument can read normally or even work normally. The meter must have good waterproof sealing and long-term stability

The existing string-type strain gauge is easily affected by the external environment because the string core measurement part is exposed to the outside world, resulting in unstable measurement. At the same time, the steel string is directly fixed on the flange covers at both ends of the protective shell, and the fixed fulcrum is basically Exposure to the external environment, after long-term use, there is a risk of rust and loosening of the fixed fulcrum, which also has a potential negative impact on the long-term stable use of the instrument

Images