Hob cutter holder assembly suitable for large-scale shaft drilling machine drill bit

Abstract

The invention provides a hob cutter holder assembly suitable for a large-scale shaft drilling machine drill bit. The hob cutter holder assembly comprises a cutter holder, a hob and two hob pre-tightening bolts, wherein the cutter holder is provided with an opening, pre-tightening threaded holes are formed in the end faces of the side walls of the two ends of the opening, and the two ends of a hob shaft of the cutter holder are fixed in the pre-tightening threaded holes through the hob pre-tightening bolts respectively. According to the hob cutter holder assembly, the combination surface of the cutter holder and the hob shaft is changed from two surfaces to three surfaces and is in close fit, so that the stress of the hob shaft and the local stress concentration of the cutter holder are improved; the hob shaft pre-tightening bolts are obliquely arranged, so that the displacement of the hob shaft in the vertical direction and the horizontal direction can be increased, and the bolts can be protected from being damaged; a T-shaped stop block is embedded in a cutter holder body to limit the separation of the hob shaft and the cutter holder body, so that the hob is effectively prevented from falling off; and in conclusion, the hob cutter holder assembly can improve the stress condition of the cutter holder and enhance the strength of the cutter holder, and can also prevent the hob from being separated from the cutter holder.

Description

technical field [0001] The invention relates to the technical field of drilling construction, in particular to a hob cutter seat assembly suitable for the drill bit of a large shaft drilling machine. Background technique [0002] With the rise of the wind power industry in my country and the continuous expansion of the construction scale of traffic bridges, a broad space is provided for the shaft construction of the drilling method. The main equipment for vertical shaft construction by drilling method is a large shaft drilling rig, which is mainly composed of drilling tool system, rotating system, hoisting system, well washing system, auxiliary system, etc. Among them, the drilling tool system mainly plays the role of rock breaking. In the drilling tool system, the function of the cutter seat is to connect the rock-breaking hob and the drill bit together, and transmit the down pressure of the drill bit and the horizontal thrust brought by the circumferential rotation to the ...

AI Technical Summary

Problems solved by technology

During use, the backing plate, the joint surface of the knife seat and the backing plate will be worn differently, resulting in a gap between the hob cutter shaft and the knife seat; the positive pressure exerted by the knife seat on the hob is partially or completely connected by the hob The bolt bears, so that when the positive pressure reaches a certain value, the hob connecting bolt is cut and damaged and breaks, and the hob is separated from the knife seat, and there is no protective mechanism, resulting in a knife drop accident

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