Hydraulic feeding system of full-automatic top drive drilling machine

Abstract

The invention discloses a hydraulic feeding system of a full-automatic top drive drilling machine. According to the hydraulic feeding system disclosed by the invention, a load-sensitive pump substitutes for a metering pump, a hydraulic control proportional directional valve substitutes for a common reversing valve, an overflow valve on an LS (Load-Sensitive) oil path rather than an overflow valve on a main oil path is used for adjusting the down pressure, an explosionproof valve is additionally arranged between a multipath valve and a lifting oil cylinder, and a duplex multipath valve substitutes for a hexad multipath valve. Compared with the prior art, the hydraulic feeding system of the full-automatic top drive drilling machine has the advantages of improving the working efficiency, reducing energy consumption, oil temperature and volume of the multipath valve, well preventing the safety accidents caused by fracture of an oil pipeline and rapid drop of the lifting oil cylinder, reducing the volumes of the valve bodies, simplifying a connection pipeline, saving the maintenance time and improving the working efficiency, the stability and the safety of the system.

Description

technical field [0001] The invention relates to a drilling rig feed hydraulic system, in particular to a full hydraulic top drive drilling rig feed hydraulic system. Background technique [0002] The feed hydraulic system of the full-hydraulic top drive drilling rig in the prior art (as attached figure 1 shown), in this system, the variable pump provides the power source for the fast feed, and the fixed pump provides the power source for the slow feed; the multi-way valve (6 pieces) is controlled by the joystick to adjust the speed of the fast feed, Slow feed speed and downforce are controlled by a relief valve. Slow feed is realized by the combination of quantitative pump, relief valve and manual reversing valve. This kind of feed hydraulic system not only has low efficiency, high energy consumption, high oil temperature and large volume of multi-way valve, but also When given, the T port of the speed regulating relief valve in the slow feed circuit needs to withstand hig...

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Problems solved by technology

[0003] Aiming at the problems existing in the above-mentioned prior art, the present invention provides a feed hydraulic system for a fully hydraulic top drive drilling rig, which solves the problems of low efficiency, high energy consumption, high oil temperature and high pressure of the overflow valve T during rapid feed, and prevents Due to the rupture of the oil pipe, the safety accident caused by the rapid decline of the oil cylinder is held, the volume of the valve body is reduced, the connecting pipeline is simplified, and the maintenance time is saved.

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