Application method of adjustable wedge-shaped chuck for tensile strength tests

Abstract

The invention discloses an application method of an adjustable wedge-shaped chuck for tensile strength tests. The application method comprises the following steps: S1, a wedge-shaped clamp plate is mounted in a clamp body opening, a wedge-shaped clamp port is formed in an inner concave part of the wedge-shaped clamp plate, an ejection rod is mounted above the wedge-shaped clamp plate, mounting grooves are formed in two ends of the inner concave part of the wedge-shaped clamp plate, a guide rod and a spring are mounted in the wedge-shaped clamp port, and the guide rod is inserted into the mounting grooves; S2, the ejection rod is started upwards to eject the wedge-shaped clamp plate up, and a test piece is placed into the wedge-shaped clamp port; S3, the ejection rod presses the wedge-shaped clamp plate, two sides of the wedge-shaped clamp plate are folded along an included angle beta, and the wedge-shaped clamp port is driven to clamp the test piece; S4, the S3 is repeated to clamp the other end of the test piece; S5, the two sides of the wedge-shaped clamp plate are opened along the wedge-shaped included angle beta, the extrusion force of the wedge-shaped clamp plate on the wedge-shaped clamp port is removed simultaneously, at the moment, the test piece is loosened by the wedge-shaped clamp port, and one tensile test process is finished. The wedge-shaped clamp plate has wider application range, the test piece is easy to clamp and dismount, the clamp port is high in self-locking performance, and the locking effect is good.

Description

technical field [0001] The invention relates to a clamping mechanism, in particular to a method for using an adjustable wedge clamp for tensile strength testing. Background technique [0002] Universal testing machine, a material testing machine integrating tensile, bending, compression, shearing, ring stiffness and other functions, is mainly used for mechanical performance tests of metal and non-metal materials. Ideal testing equipment for departments such as quality supervision stations. Universal testing machine is also called universal material testing machine, or tensile machine, double screw series, integrated structure of control, measurement and operation, integrating contemporary advanced technology, with high precision, wide speed range, compact structure, convenient operation, Stable performance and other advantages. It is suitable for tensile, compression, bending and creep tests of material samples and products such as plastics, waterproof materials, textiles,...

AI Technical Summary

Problems solved by technology

[0005] In the existing universal testing machine, the collets used are generally wedge-shaped collets. During the process of stretching the test piece, the wedge-shaped collets always clamp and loosen along a wedge-shaped angle. If the value is large, the expansion of the bayonet is large, and the specimen is easy to install and disassemble, but the self-locking performance is poor. To clamp the specimen, the teeth of the bayonet should pay a large cutting force, so that the bayonet is prone to slipping or Tooth collapse, and the durability of the bayonet is reduced. If the wedge angle is smaller, although the expansion of the bayonet is small, the chuck has strong self-locking performance, and it is easy to clamp and lock the test piece, especially the colored Metal specimens and low-hardness specimens are clamped and locked firmly, however, the tighter the clamping and the firmer the lock, the more difficult it is to disassemble the specimen remains

In view of this, some testing machines use hydraulic wedge chucks, which not only fail to solve the problem fundamentally, but often appear new contradictions that the hydraulic cylinder is easy to leak or leak oil, which affects the test

Images