Clamping piece type small-diameter steel bar stretching clamp and clamping structure

Abstract

The invention provides a clamping piece type small-diameter steel bar stretching clamp and the clamping structure; after an existing stretching experiment is studied, the stretching clamp is improved,a clamp capable of meeting the requirement of a large stretching testing machine for conducting a small-diameter rod body metal material static stretching test is developed, multiple clamping piecesare arranged to clamp a to-be-tested rod body; when an adjusting nut rotates to extrude the clamping piece, the conical surface of the outer wall of the clamping piece and the conical surface of the inner wall of the outer clamping sleeve interact with each other to extrude the to-be-tested rod body in the radial direction in the process that the clamping piece extrudes towards the outer clampingsleeve along with the adjusting nut, and the to-be-tested rod body is pressed tightly along with screwing of the adjusting nut. Therefore, a problem that in the existing static stretching test, the to-be-tested rod body is easy to slip or cannot be clamped is solved; and a propelling effect is achieved on the characteristic research of the microscopic NPR anchor rod; an alignment sleeve is arranged to guarantee the coaxiality of the to-be-tested rod body and the first clamping groove, the clamping piece of the multi-petal structure presses the to-be-tested rod body to guarantee that the to-be-tested rod body is stressed in a balanced mode, and the test precision is guaranteed.

Description

technical field

[0001] The invention belongs to the technical field of indoor static tensile tests, and in particular relates to a card-type small-diameter steel bar tensile fixture and a clamping structure. Background technique

[0002] my country has a vast territory and complex geological environment. Geological disasters are widely distributed and occur frequently, such as landslides and earthquakes, which have a huge impact on the safety of people's lives and properties. In addition, as a major international engineering country and resource mining country, the large deformation disasters of rock mass caused by engineering construction and resource mining have always remained high, such as large deformation of soft rock in deep tunnels, impact rockburst and other disasters that caused a lot of loss of life and property , seriously restricting the safe and efficient development of major projects in my country. Studies have shown that most rock mass disasters develop from ...

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