Hydraulic control system of rock drill

Abstract

The invention belongs to the technical field of rock drilling equipment. A hydraulic control system of a rock drill comprises a propelling pressure control unit, wherein the propelling pressure control unit comprises a propelling oil source, a propelling oil cylinder, a proportional anti-jamming reversing valve, a propelling pressure reducing valve and a propelling overflow valve, and an oil outlet port A and an oil return port B of the propelling oil source are connected with a rodless cavity and a rod cavity of the propelling oil cylinder through the proportional anti-jamming reversing valve separately; the propelling pressure reducing valve is arranged on an oil path between the rodless cavity of the propelling oil cylinder and the proportional anti-jamming reversing valve; and the propelling overflow valve is connected with an external control port of the propelling pressure reducing valve. According to the invention, through a simple and reliable hydraulic control principle of adjusting a propelling pressure to be matched with an impact pressure, the functions of automatically adjusting an impact power along with the propelling pressure and preventing idling can be realized; and a forced high-impact function is set according to actual requirements, and the feeding speed and direction of the propelling oil cylinder can be automatically and proportionally controlled according to the change of the resistance of a rotary motor, so that an automatic and proportional anti-jamming function is realized.

Description

technical field [0001] The invention belongs to the technical field of rock drilling equipment, and in particular relates to a hydraulic control system of a rock drilling machine. Background technique [0002] The hydraulic rock drill is one of the indispensable main equipments in engineering construction in the fields of mining, railway, highway, hydropower, construction, etc. It has the advantages of fast rock drilling speed, high energy utilization rate, low noise, and high rock drilling power. Especially with the integration of hydraulic technology and computer technology, it has promoted the development and progress of rock drilling technology and rock drilling machines. As a kind of rotary impact crushing equipment, the hydraulic rock drill encounters complex and changeable rock geological conditions during rock drilling. Different propulsion pressure and impact pressure matching are required for different geological structures. In addition, if the drill bit encounters...

AI Technical Summary

Problems solved by technology

[0003] Existing technologies in the market mainly have the drilling mode with low propulsion pressure corresponding to low impact pressure and the drilling mode with high propulsion pressure corresponding to high impact pressure, but there is no special case Under special conditions that require high impact pressure regardless of the propulsion pressure

In addition, the anti-jamming reversing valve in the prior art is mainly an on-off valve, which cannot control the feed speed of the propulsion cylinder according to the change ratio of the resistance of the rotary motor, resulting in failure of the jamming or misoperation of the propulsion cylinder

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