Lower driving head of dual-power drilling machine

Abstract

The invention discloses a lower driving head of a dual-power drilling machine. The lower driving head of the dual-power drilling machine comprises a gear box, planetary reducers, two sets of verticaltype motors, an inner retainer and a lower flange, wherein the gear box includes an output sleeve assembly. The output sleeve assembly penetrates through the gear box perpendicularly through a sleevebody of the output sleeve assembly. The planetary reducers are arranged on the left and right sides of the output sleeve assembly. Pinion gears on output shafts mesh with big gear wheels on the outputsleeve assembly separately. The inner retainer penetrates through the sleeve body and is fixedly installed on the upper end surface of the sleeve body through an end flange of the inner retainer. Thelower flange is fixedly installed at the lowermost end of the inner retainer. The fit clearance between the inner diameter W1 of the sleeve body and the outer diameter W2 of the inner retainer is 0.20-0.5 mm. The lower driving head drives a lower sleeve drilling tool to rotate reversely to follow up wall protection and drilling, the verticality of a drilling hole is improved, the risk of collapseof a hole wall is reduced, the loads of a drill pipe and the drilling tool are reduced, torque transmission of the sleeve body and the drilling safety are ensured, stable operation of the lower driving head is ensured, the work efficiency is high, and the requirements of low carbon emission and energy conservation and environmental protection for pile foundation construction are met.

Description

technical field [0001] The invention belongs to a lower driving head, in particular to a lower driving head of a double power head drilling machine, which is suitable for the construction of bored piles. Background technique [0002] In recent years, my country's infrastructure construction and urbanization have developed rapidly. In construction projects such as high-rise buildings, railways, highways and bridges, the requirements for building pile foundations are also getting higher and higher. Compared with prefabricated piles, cast-in-situ piles are not restricted by stratum changes, do not need to connect and cut piles, have strong adaptability, relatively stable stress conditions, both compression and pull resistance, small vibration, low noise, and no extrusion during construction. The negative effect of soil can pass through various hard interlayers, rock sockets and enter various hard bearing layers. There is a large room for adjustment of pile geometric dimensions ...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, these pile holes are often constructed in hard strata such as pebbles, gravel layers and weathered rock layers, and even encounter large boulders. At present, drilling rigs such as rotary drilling rigs and long auger drilling rigs on the market are difficult to deal with particularly hard rock formations such as pebble layers, boulder layers, and hard weathered rock layers.

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