Connecting device

Abstract

The invention discloses a connecting device for metal parts. The connecting device comprises a lock pin (S) capable of achieving plastic deformation under force, a cylinder (Z) reserved on one part and a drum (T) reserved on the other part, wherein a circular hole (K1) perpendicular to the axial direction is formed in the cylinder, the diameter of the circular hole (K1) increases gradually on the side of the cylinder (Z), which is close to the part, to form a curved surface (Q), and a circular hole (K2) perpendicular to the axial direction is reserved in the wall of the drum (T). When the two parts are connected, the cylinder (Z) extends into the drum (T), the lock pin (S) is enabled to be align to and inserted in the circular hole (K1) of the cylinder (Z) and the circular hole (K2) of the drum (T), then, an opposite force is exerted to enable the lock pin (S) to deform to abut against the curved surface (Q) to complete the connection. According to the mode, a cheap and convenient mounting mode, such as mounting of milling machine drills and abrasion-resistant protective hoods of hydraulic breakers, is provided for metal parts gone through unidirectional strong impact and occasions allowing unidirectional small-scale deformation to form an effect of increasing tightness by clamping.

Description

technical field [0001] The invention proposes a connecting device for connecting two metal parts. Background technique [0002] There are many types of connecting devices for metal parts, but in some occasions, metal parts are subjected to a huge impact force in a single direction, but the force in other directions is not large, such as the wear-resistant protective head cover of the hydraulic breaker drill rod For the connection, only the force from the breaking hammer along the axis of the chisel to the broken object is extremely large, and there is no force in other directions during work, as long as the connection of the parts is maintained. For example, a drill rod with a diameter of 140mm may withstand an impact energy of more than 4500kj, and common connecting devices such as welding and threading cannot withstand such a huge impact force; The surface deformation is very serious, and some connecting devices such as bayonet pins will produce a large gap, resulting in ...

AI Technical Summary

Problems solved by technology

For example, a drill rod with a diameter of 140mm may withstand an impact energy of more than 4500kj, and common connecting devices such as welding and threading cannot withstand such a huge impact force; The surface deformation is very serious, and some connection devices such as bayonet pins will produce a large gap, resulting in falling off and so on.

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