Hydraulic system of rotary excavating squeezing and expanding drilling machine for forming branch pile hole

Abstract

The invention discloses a hydraulic system of a rotary excavating squeezing and expanding drilling machine for forming a branch pile hole, which comprises an upper hydraulic system and a lower hydraulic system, and the lower hydraulic system comprises a walking hydraulic system loop and a crawler broadening loop. The loading hydraulic system comprises a rotary hydraulic loop, a main coil hydraulic loop, an auxiliary coil hydraulic loop, a power head hydraulic loop, an extrusion and expansion hydraulic loop, a pressurization hydraulic loop, a mast hydraulic loop and a variable amplitude hydraulic system loop; the squeezing and expanding hydraulic loop comprises a squeezing and expanding oil cylinder, the squeezing and expanding oil cylinder is communicated with a balance valve, the balance valve is communicated with an auxiliary valve squeezing and expanding linkage valve, and the auxiliary valve squeezing and expanding linkage valve is communicated with an auxiliary pump; one end of the auxiliary valve extrusion-expansion joint valve is communicated with the pilot oil AM port, and the other end of the auxiliary valve extrusion-expansion joint valve is communicated with the pilot oil BM port. According to the multi-way valve of the auxiliary valve of the rotary excavating squeezing and expanding drilling machine, the squeezing and expanding control unit is specially added for the squeezing and expanding oil cylinder, and therefore high-precision control over the action of the rotary expanding oil cylinder can be better achieved.

Description

【Technical field】 [0001] The invention relates to a hydraulic control system of engineering machinery, in particular to a hydraulic system of a rotary-drilling-extrusion-expansion drilling rig used for forming pile holes of disc piles. 【Background technique】 [0002] In recent years, various types of drilling rigs have been used for forming piles, but most of them are limited to cylindrical piles. As a large-scale drilling construction equipment, the rotary drilling rig has good hole-forming effect, high work efficiency, wide application range, flexible and convenient movement, and is environmentally friendly. It is widely used in urban infrastructure construction and other large construction sites. In my country Construction, transportation, industry and other fields play an important role. The horizontal bearing capacity, stability and strength of cylindrical piles are not high, especially when the pile depth is relatively long, it is not easy to repair. Transforming cyli...

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Problems solved by technology

[0003] Invention patent CN201210375676.X discloses a hydraulic system of a rotary expansion device for a rotary drilling rig, but the power oil of the rotary expansion cylinder comes from the auxiliary valve pressurization control of the original rotary drilling rig and is switched by an electronically controlled diverter valve, so that the control of the rotary expansion cylinder low precision

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