Mining anchor pole dynamometer

Abstract

The invention discloses a mining anchor pole dynamometer which comprises a resistance strain type anchor pole force transducer and a secondary monitoring instrument. The resistance strain type anchor pole force transducer comprises a hollow sleeve rod and an annular strain transducer set. An external thread is tapped on one end of the hollow sleeve rod, and an internal thread is tapped on the other end of the hollow sleeve rod. The internal-thread end is connected with an anchor net supporting anchor pole, and a pretightening force is applied on the external-thread end by means of a nut. The hollow sleeve rod is internally provided with the annular strain transducer set. The annular strain transducer set 4 comprises a plurality of uniformly arranged single annular strain sensors and is internally provided with a foil type resistor disc. The foil type resistor disc is connected through a lead. The secondary monitoring instrument has functions of data processing, real-time field display, wired transmission or wireless transmission. The nut is fixedly connected with the lower end of the anchor rod. Working load data at the end of the anchor rod are transmitted through an industrial ring network. The mining anchor pole dynamometer effectively settles a problem that the monitored value of a resistance strain element linearly changes along with the working load at the end of the anchor rod, and furthermore can monitor the transmitted data in real time.

Description

technical field [0001] The invention belongs to the technical category of bolt working load monitoring in the dynamic special item of surrounding rock of mine roadway in coal-measure strata, and specifically relates to a mine bolt dynamometer. Background technique [0002] In the special monitoring of the surrounding rock dynamics of the mine roadway, the monitoring of the stress state of the bolt is a basic work in the anchor net support. For end-anchored or extended anchor bolts, the purpose of monitoring is to understand the actual stress state of the bolt, and judge the rationality of the design prestress, initial anchor force and pull-out force, which is specifically reflected in the monitoring of the working load of the bolt. When the bolt support is end anchorage or extended anchorage, the existing bolt end working load monitoring instruments are mainly divided into hydraulic pillow type, optical fiber grating type and resistance strain type according to their sensors...

AI Technical Summary

Problems solved by technology

The resistance strain sensor structure of the resistance anchor dynamometer is mainly a tension-compression elastic element, and the resistance strain element is installed in the maximum principal strain direction of the tension-compression elastic element. Components, use tension-compression elastic elements to collect data on the working load at the end of the anchor rod and convert them into electrical signals through resistance strain elements. The disadvantages are: when the tension-compression elastic elements are subjected to tension, the cross-sectional area decreases; When the cross-sectional area increases, the monitoring value of the resistance strain element does not have a linear relationship with the working load at the end of the bolt.

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