Device for testing breaking tenacity in long and narrow space and using method of device

The invention discloses a device for testing breaking tenacity in a long and narrow space and a using method of the device. The device comprises a sleeve, a left clamping head, a right clamping head, a sliding block and pusher fixing rods, the left clamping head, the right clamping head and a tensile sample are mounted inside the sleeve, a functional window used for mounting of the tensile sample and a displacement sensor is arranged in a sidewall of the sleeve, the tensile sample is connected with the left clamping head and the right clamping head through pin bolts, the left clamping head and the right clamping head are connected with the sleeve and the sliding block through mutually-fitted blocking heads and blocking grooves, the sliding block is connected with a force sensor through a bolt, the other end of the sliding block is connected with a matched electric drive pusher, a target card is mounted on the left clamping head and used for providing positioning signals for the displacement sensor. The device