Hydraulic control system for rotation system of horizontal directional drilling machine

Abstract

The invention discloses a hydraulic control system for a rotation system of a horizontal directional drilling machine, and relates to a hydraulic control system for the horizontal directional drilling machine. The hydraulic control system comprises a main pump, a main control valve, a double-speed valve device and a power head assembly, wherein the double-speed valve device comprises a two-way cartridge valve I, a two-way cartridge valve II, a control cover plate I, a control cover plate II, an electromagnetic reversing valve and a shuttle valve; and a pressure signal of an oil circuit with higher pressure in an oil circuit I and an oil circuit III is introduced into the electromagnetic reversing valve through the shuttle valve, and is selectively introduced into a control cavity of the two-way cartridge valve I or the two-way cartridge valve II through different working positions of the electromagnetic reversing valve, the two-way cartridge valve with the pressure signal is in a closed state, and the two-way cartridge valve without the pressure signal is in an open state, so that an oil circuit II is selectively connected with the oil circuit I or the oil circuit II, different oil circuit connection modes are realized, the aim that the flow of the main pump is only supplied to a hydraulic motor I or is supplied to the hydraulic motor I and a hydraulic motor II simultaneously is fulfilled, and the rotation system of the drilling machine is switched between a high speed gear and a low speed gear.

Description

technical field [0001] The invention relates to a hydraulic control system of a horizontal directional drilling rig, in particular to a hydraulic control system of a rotation system of a horizontal directional drilling rig. Background technique [0002] For horizontal directional drilling rigs with constant pump hydraulic system, the rotation of the power head is generally driven by several hydraulic motors together with the reducer, and the reducer outputs power. Through different hydraulic oil circuit connection methods, two gears, high speed and low speed, can be realized. The high speed gear realizes high speed and low torque, and the low speed gear realizes low speed and high torque. Generally, through the reversing of the manual slide valve, the flow collection and distribution methods of different hydraulic oil circuits are realized, and several hydraulic motors are connected in series or in parallel to realize the switching between high and low gears. Such as figur...

AI Technical Summary

Problems solved by technology

[0003] The hydraulic system of the power head mostly uses a large-displacement main pump. If the manual spool valve is used to change the direction to realize the different flow collection and distribution methods of the hydraulic oil circuit, excessive pressure loss will be generated at the oil port of the manual spool valve. , resulting in insufficient power or hydraulic motor sucking air, etc.

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