Tensile strain measuring device for petroleum pipe coupling loading test

The utility model relates to a tensile strain measuring device for a petroleum pipe coupling loading test. The tensile strain measuring device comprises two supports, a telescopic and slidable hinged guide device, a displacement sensor, two sets of clamps and a hoop, hoops are arranged at the two ends of the petroleum pipe respectively, the two supports are installed on the hoops at the two ends of the petroleum pipe respectively, the telescopic sliding hinge guide device is connected between the two supports, and the displacement sensor is installed on the lower portion of the telescopic sliding hinge guide device in parallel through two sliding blocks and driven by the guide device to stretch out and draw back freely. Pipe clamps are arranged at the upper ends of the two sliding blocks; the displacement sensor, the guiding device and the petroleum pipe are arranged in parallel. The device can be used for accurately measuring the tensile strain during the tubing coupling test. The integral or local scaling i