Square shaft structure of rotary drilling rig

Abstract

The invention relates to a connecting structure between a tripod and a drilling mast of a rotary drilling rig. The structure consists of the tripod, a square shaft, a main shaft, a positioning pin shaft, a bush, a pin shaft assembly and the like. Two ends of the main shaft are connected with the drilling mast through the bush, the middle part of the main shaft is fixed with the square shaft together by means of the positioning pin shaft, and two ends of the square shaft are supported on the tripod through the pin shaft assembly. When the drilling mast is in a vertical state, the gravity of the rotary drilling rig working device and the dynamic load generated during operating are transferred to the main shaft through the bush in a drilling mast square box and then transferred to the square shaft by the main shaft. Once the front end face of the drilling mast is not vertical to the ground, the main shaft and the drilling mast generate a sliding tendency; when the front end face of the drilling mast inclines to the ground in a small angle, the drilling mast and the square shaft are directly contacted; and because the main shaft is connected with the square shaft to form a whole, the stress conditions of the contacted parts are greatly improved, and any part is not damaged during the operation of the drilling rig.

Description

technical field [0001] The invention relates to the connection structure between the drill mast and the tripod of various rotary drilling rigs, and is especially suitable for medium and small-sized rotary drilling rigs in the transportation state with drill rods, where the requirements for the height and dimension of the whole machine are extremely strict. Background technique [0002] At present, there are two completely different structures of the connection structure between the drill mast and the tripod of the rotary drilling rig: "cross shaft" and "square shaft". In terms of its compact square shaft structure, it is widely used in the structural design of various rotary drilling rigs because of its simple structure and convenient maintenance. [0003] In the structure of the square shaft, the key part, the square shaft, is respectively connected to the pin shaft assembly I integrated with the tripod, and the pin shaft assembly II fixed on the drill mast. With the diffe...

AI Technical Summary

Problems solved by technology

With the prolongation of the use time of the drilling rig, the lug plate on the pin shaft assembly II connected with the drill mast, and the connecting weld between the pin shaft and the pin shaft are gradually torn, making the drilling rig unable to continue to work

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