Single-pump hydraulic control loop of key drilling action of cutting drill rig

Abstract

A single-pump hydraulic control loop of a key drilling action of a cutting drill rig comprises a load-sensitive variable pump, a load-sensitive multi-way valve, a rotary motor, a propulsion oil tank, a drilling logic control block, a rotation guide handle, a propulsion guide handle, and a hydraulic oil tank. An oil inlet of the load-sensitive variable pump is connected with the hydraulic oil tank. An oil outlet and a load-sensitive opening of the load-sensitive variable pump are connected with an oil inlet and a load-sensitive opening of the load-sensitive multi-way valve respectively. Each valve pressure difference compensator of the load-sensitive multi-way valve is provided with an external control opening. The external control openings are connected with the drilling logic control block. The rotation guide handle and the propulsion guide handle are connected with the drilling logic control block or a guide control opening of the load-sensitive multi-way valve. The double-pump hydraulic control loop has the advantages that power head rotation-proportion-controlled propulsion is achieved, high-speed rotating with propulsion prior to rotation is achieved, fast rod lifting while retaining certain rotation speed is achieved, and the like.

Description

Technical field [0001] The invention relates to a single-pump hydraulic control circuit for key rock drilling actions of a cutting drilling rig. Background technique [0002] The cutting drilling rig is a new type of rock drilling rig. Its operating mechanism is high-speed rotary crushing drilling. It has the outstanding advantages of high speed, high efficiency, simplicity and convenience for drilling operations in shale, sandstone and other rock formations. Comprehensive analysis of the current hydraulic systems of cutting drilling rigs of various brands , are all developed based on the simple improvement of the hydraulic system of small or medium excavators. Compared with the excavator, the cutting drilling rig subtracts the three actions of the swing arm, the breaker and the bucket, and increases the three actions of the power head propulsion, the power head rotation, and the air compressor. The breaker unit and the bucket unit realize the control of the three actions o...

AI Technical Summary

Problems solved by technology

[0003] However, the cutting drilling rig hydraulic system based on the improvement and development of the hydraulic system of the excavator has the advantages of simplicity and ease of operation, which shortens the development cycle of the cutting drilling rig hydraulic system, but this system has inherent limitations. Poor drilling adaptability when changing

Decompression type constant pressure propulsion control, when the pressure of the decompression valve is set, the propulsion force is a constant value during the drilling process. In soft rock geology, under the same rotation speed of the power head, although the hardness of the rock formation is soft, the drill bit will The feed rate of the drill bit is relatively large, and the establishment of rotary resistance is relatively high; in hard rock geology, under the same rotation speed of the power head, although the hardness of the rock formation is relatively hard, the feed rate of the single turn of the drill bit is small, and the establishment of rotary resistance is low; When the geology of the rock formation changes from soft rock to hard rock during the drilling process, the feed rate of the single turn of the drill bit becomes smaller, and the required flow rate for propulsion decreases. The speed decreases instead; when the rock formation changes from hard rock to soft rock during the drilling process, the single-turn feed of the drill bit becomes larger, and the flow required for propulsion increases, the rotary speed becomes slower, the rotary resistance builds up, and the drilling speed Faster, but the rotation resistance rises to a certain value, causing stuck pipe

At the same time, the cutting drilling rig hydraulic system developed based on the improvement of the excavator system has irrationality in the control performance of the hole lifting rod, the speed of the hole lifting rod is slow, or the rotation of the power head is stopped and the flow of the main control valve rotation joint is combined to the propulsion main body. The oil circuit increases the speed of lifting the rod, but stops the rotation. If a large piece of broken stone slides into the hole, it will cause sudden sticking. Therefore, the key rock drilling action of the cutting rig needs a special hydraulic control circuit that is more suitable for its working conditions.

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