Fast propulsion hydraulic control loop of down-the-hole drill rig

Abstract

Disclosed is a fast propulsion hydraulic control loop of a down-the-hole drill rig. A first multi-way reversing valve is connected with a propulsion motor. A second multi-way reversing valve is connected with a hydraulic control selector valve. The hydraulic control selector valve is connected with the propulsion motor and a rotary motor. A hydraulic control opening of the hydraulic control selector valve is connected with an output end of a propulsion rotation logic control block. The first multi-way reversing valve and the second multi-way reversing valve are connected with a propulsion guide handle and a rotation guide handle through the propulsion rotation logic control block. A double linkage load-sensitive variable pump set is connected with a remote control relief valve through the propulsion rotation logic control block. By the fast propulsion hydraulic control loop, propulsion speed of a power head under working conditions of rod-feeding empty raising and rod-discharging empty propulsion is increased effectively, cycle time of drilling operation is shortened, and comprehensive time efficiency of the operation is improved.

Description

technical field [0001] The invention relates to a rapid propulsion hydraulic control circuit for down-the-hole drilling. Background technique [0002] The integrated hydraulic down-the-hole drilling rig is widely used in metallurgy, mining, building materials, railways, hydropower construction, and national defense construction due to its large operating aperture, deep drilling depth, key operations, adjustment positioning, and integrated hydraulic control and pilot control for walking movements. Blast hole drilling for open-air engineering such as earthwork and earthwork. The integrated hydraulic down-the-hole drilling rig adopts hydraulic control and pilot control for the control of key rock drilling operations, connecting and unloading actions, adjusting positioning and walking actions, and the hydraulic power unit adopts double-connected plunger constant power load-sensitive pumps + pump displacement The control block, the control unit adopts two three-position six-way ...

AI Technical Summary

Problems solved by technology

Considering the simplicity and reliability of the walking control circuit, the two walking motors also independently use one pump in the double-piston pump set and a valve in the two multi-way valves. The two pumps in the double-piston pump set are completely Consistent, the two multi-way valves are also completely consistent, but with this method, there are certain limitations in the control of the speed of the power head's propulsion action, especially when the power head is lifted under the condition of connecting rods, and the power head is lowered under the conditions of unloading rods. Pushing and other speeds are slow, which restricts the efficiency of drilling operations

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