Hydraulic cylinder for a rock drill and an impact device thereof

By setting a central through hole, pressure chamber, fluid channel and oil return chamber on the cylinder of the hydraulic rock drill, timely oil replenishment to the brake protrusion of the control valve can be achieved, solving the problem of cavitation of the control valve and improving the service life and working efficiency of the rock drill.

CN224550505UActive Publication Date: 2026-07-24JIANGXI WORTH ROCK DRILLING HYDRAULIC CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
JIANGXI WORTH ROCK DRILLING HYDRAULIC CO LTD
Filing Date
2025-09-23
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

In existing rock drill impact devices, cavitation is prone to occur at the brake protrusion of the control valve, and the existing structure is complex and difficult to process, which increases manufacturing costs.

Method used

A cylinder body for a hydraulic rock drill is designed. By setting a central through hole, pressure chamber, fluid channel, high pressure chamber and oil return chamber on the cylinder body, the oil can be ensured to replenish the brake lug of the control valve in time to avoid cavitation. The radial design with a regular structure is adopted to simplify the machining.

Benefits of technology

It effectively prevents cavitation at the brake protrusion of the control valve, improves the service life and working efficiency of the impact device, and reduces production difficulty and cost.

✦ Generated by Eureka AI based on patent content.

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    Figure CN224550505U_ABST
Patent Text Reader

Abstract

The application provides a cylinder for hydraulic rock drill and an impact device thereof. The cylinder is provided with a center through hole penetrating in the axial direction, which is used for installing an impact piston. At least two pressure cavities are formed between the radial outer surface of the impact piston and the radial inner surface of the center through hole, one of which is used for accommodating a control valve. A high pressure cavity and an oil return cavity are formed between the radial outer surface of the cylinder and the radial inner surface of the main body of the rock drill, the high pressure cavity is used for feeding oil into the pressure cavity where the control valve is located, and the oil return cavity is used for returning oil from the pressure cavity where the control valve is located, and the high pressure cavity and the oil return cavity are distributed along the axial direction. The cylinder is provided with a fluid channel, one end of the fluid channel is communicated with a brake cavity where a brake block of the control valve is located, and the other end is communicated with the high pressure cavity or the oil return cavity, so that the brake block can be timely supplemented with oil, and cavitation erosion at the brake block is avoided. In the cooperation of the fluid channel, the high pressure cavity and the oil return cavity, the probability of cavitation erosion at the front end, the rear end and the middle part of the control valve is reduced.
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