Equipment for testing elongation at break of metal material and use method of equipment

The invention relates to metal material elongation at break testing equipment and a use method thereof, and belongs to the technical field of metal material performance testing. The device comprises a base, a support is arranged on the base, a lifting device is arranged on the support, connecting plates are symmetrically arranged at the tail end of the lifting device and on the base in the vertical direction, clamping units are arranged on the sides, close to each other, of the connecting plates, and an adsorption mechanism is arranged on the other sides of the connecting plates. The clamping unit comprises clamping plates arranged at intervals, the clamping plates are connected with the connecting plate in a sliding mode, screws are arranged in the direction parallel to the sliding grooves in a penetrating mode, the sides, penetrating out of the clamping plates, of the screws are sleeved with nuts, and the clamping plates arranged at intervals are located between the two nuts on the same screw. The clamping