Drilling machine and hydraulic system thereof

Abstract

The invention provides a drilling machine and a hydraulic system thereof. When the forward rotation pressure of a rotary motor reaches a pressure value to be set of an anti-sticking drilling valve, forward rotation control oil of the rotary motor opens a sequence valve of the anti-sticking drilling valve, and a hydraulic reversing valve of the anti-sticking drilling valve reverses at the same time, so that a hydraulic cylinder is changed from a propulsive state to a retrogressive state; when the rotary motor continues to rotate forward, drilling cuttings are discharged by a drilling tool to avoid sticking; when a drilling rod is disassembled from the drilling machine, a reversing valve is controlled to be in the center, and reverse control oil of the rotary motor opens sequence valves of afirst balance valve and a second balance valve, so that oil circuits of the feeding end and the receding end of the hydraulic cylinder communicate with each other, the hydraulic cylinder is in a floating state, and a damage to drilling rod threads is effectively avoided during disassembling the drilling rod; and when the reversing valve is in the center and the rotary motor does not reverse, hydraulic oil in the oil circuits is sealed in hydraulic cylinder by one-way valves of the first balance valve and the second balance valve to prevent a power head of the drilling machine from falling during drilling holes at an elevation angle or a pitch angle of the drilling tool.

Description

technical field

[0001] The invention relates to the technical field of drilling rigs, in particular to a hydraulic system of the drilling rig and the drilling rig. Background technique

[0002] Hydraulic drilling rigs are commonly used production equipment in coal mine gas drainage operations. The hydraulic system of the drilling rig uses hydraulic pumps to convert mechanical energy into liquid pressure energy, and the liquid pressure energy through various control valves, pipelines and hydraulic components is converted into mechanical energy to drive the working mechanism to achieve linear reciprocating or rotary motion; the hydraulic pressure of the drilling rig The design of the system plays a decisive role in the overall performance of the hydraulic drilling rig.

[0003] The hydraulic drilling rig in the existing design often has the problem of drill sticking during the drilling process, which leads to the interruption of production operations and seriously affects the...

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