A kind of mast and mast lifting method of rotary drilling rig

Abstract

The invention discloses a mast of a rotary drilling rig and a mast rising method. The mast comprises a main rod, a telescopic rod, a first reverse wheel, a second reverse wheel, a third reverse wheel,a chain rope and a driving device, wherein one end of the main rod is in pivot connection to a mast supporting seat, the telescopic rod is nested in the main rod, the first reverse wheel is fixedly arranged at the bottom end of the telescopic rod, the second reverse wheel is fixedly arranged on the upper portion of the outer wall of one side of the main rod, the third reverse wheel and the driving device are arranged on a revolving platform, one end of the chain rope is fixed with the inner wall of one side of the main rod, and the other end of the chain rope passes through the first reversewheel, the second reverse wheel and the third reverse wheel in sequence and then is connected with the driving device; after a vertical rod of the mast is in place, the driving device drives the telescopic rod to stretch out from the main rod through the chain rope; through the cooperation of the reverse wheels, a steel wire rope and the driving device, the mast rising efficiency and safety are improved, the number of auxiliary tools and personnel of mast rising is reduced, and the mast rising cost is effectively saved.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a mast of a rotary drilling rig and a method for raising the mast. Background technique [0002] Rotary drilling rig is a kind of construction machine suitable for hole forming in pile foundation engineering. Its principle is to drive the drill pipe by the power head to realize the rotation of the drilling tool to cut the rock and soil, and then use the winch to lift the drilling tool to the outside of the hole to unload the soil. Through periodic cycle operation until the hole is formed. Rotary drilling rigs are not only suitable for the construction of sandy soil, cohesive soil, silty soil and other soil layers, but also for the construction of rock layers, and have been widely used in various foundation constructions such as cast-in-place piles, diaphragm walls, and foundation reinforcement. As an efficient and advanced hole-forming equipment, the rotary drillin...

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Problems solved by technology

Chinese patent CN201520403619.7 discloses a telescopic mast for engineering vehicles, which includes at least two mast splits, the mast splits are nested together, and each mast split is provided with multiple positions along the length direction. The gear position fixed connection point used to adjust the telescopic length, the adjacent mast splits are stretched and connected at the corresponding gear position fixed connection point through the connecting piece, and the outer side of the mast split body is installed to drive the adjacent mast Telescopic drive device with relative telescopic movement of the split body; in this structure, the mast adopts the method of oil cylinder telescopic two-stage telescopic arm, but when the mast telescopically stretches, it will cause greater friction between the mast splits due to unbalanced force, etc. As a result, the mast split is damaged due to excessive friction after repeated use, and eventually the mast cannot be used normally, and the service life of the mast is short

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