Structure of hydraulic breaker drill rod, and method for embedding alloy drill bit of hydraulic breaker drill rod

Abstract

The invention discloses a structure of a hydraulic breaker drill rod and a method for embedding an alloy drill bit of the hydraulic breaker drill rod. The structure of the hydraulic breaker drill rod is characterized in that: a threaded central hole is formed at the working end of the head of a drill rod main body; a recessed flat section is arranged at the middle end of the drill rod main body; the tail end face of the drill rod main body is a drill tail impact surface; a drill bit is made from alloy material; the head of the drill bit is provided with a drill bit working edge, the middle part of the drill bit is provided with a threaded screw, and the tail end face of the drill bit is provided with a drill bit impact surface. The method for embedding the alloy drill bit of the hydraulic breaker drill rod is characterized by: fixing the drill rod main body through the flat section of the drill rod main body; using the plane of the working edge of the alloy drill bit as a rotary stress surface; applying a tightening moment; screwing the threaded screw of the alloy drill bit in the threaded central hole of the drill rod main body; making up a thread pair by the threaded central hole and the threaded screw; and embedding the drill bit in the drill rod main body, thereby generating a proper pre-tightening force between the drill rod main body and the alloy drill bit. The structure of the hydraulic breaker drill rod disclosed by the invention is simple in structure, convenient in processing and mounting, effective and durable.

Description

technical field [0001] The invention belongs to the technical field of engineering machinery, and in particular relates to a drill rod structure of a hydraulic breaker and an inlay method for an alloy drill bit thereof. Background technique [0002] The drill rod of the hydraulic breaker is used to break hard objects such as rocks and concrete. It is required that the end of the drill rod that bears the impact of the piston has good toughness. The head (working end of the drill rod) has high strength, toughness and wear resistance requirements. Therefore, the drill head, drill tail and middle part of the drill rod have different requirements for hardness, strength, wear resistance and bending resistance. At present, there are mainly two types of domestic drill rods. One is the integral structure drill rods that are widely used at present, using the same ordinary carbon steel or alloy structural steel (such as No. 45 steel), and their performance is mainly guaranteed by hea...

AI Technical Summary

Problems solved by technology

Since the hydraulic breaker uses the high-frequency impact of the piston on the drill tail to realize the high-frequency impact of the drill bit on the broken object, and the impact force is huge, therefore, when the welding seam of the alloy drill bit is embedded in the brazing process, when the high-frequency and large impact force is transmitted It is easy to be damaged, and the drill bit will loosen or even fall out; while the method of inlaying the alloy drill bit with the temperature difference press-in process is fixed by the interference. Transmission of pulse heavy loads is prone to fatigue failure and loosening

[0004] When the drill rod body and the drill bit become loose, when the piston of the hydraulic breaker hits the drill tail, because there is a loose gap between the drill rod body and the drill bit, the impact force cannot be directly transmitted to the broken object through the drill bit, and the drill rod body needs to The drill bit can only be hit after the empty stroke of the loosening gap, resulting in a secondary impact phenomenon, which consumes part of the impact force. The effective utilization rate of the machine is reduced by 8~25%

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