HYDRAULIC MOTOR FOR PILE-DRIVING HAMMER Russian patent published in 2017 - IPC E02D7/10 

FIELD: engines and pumps.

SUBSTANCE: invention refers to the hydraulic motors for hammers used for landing reinforced concrete and steel piles, studs, and other driving components. The hydraulic motor contains two double-position valves, the discharge one and the drain one. The drain valve periodically communicates a head end of a hydraulic cylinder with a drain line, and the discharge valve periodically communicates the head end of the hydraulic cylinder with a discharge line. Whereupon, each valve contains a control cavity and a back-valve cavity. The control cavity of the discharge valve is always connected to the drain line, and the control cavity of the drain valve is always connected to the discharge line. Control of the drain and discharge valves is performed by periodical connection of their back-valve cavities to the drain or discharge line via a separate electrical and hydraulic four-port on/off control valve. Whereupon, switching signals for each control valve are generated by a controller at interaction of a hammer's moving component with a position sensor. A return valve, which allows an operation fluid to flow freely from the head end into the rod end and prevents the operation fluid from flowing in the reversed direction, is installed between the head end and the rod end of the hydraulic motor. Whereupon, pilot-controlled valves, two pilot-controlled valves in each control line (connecting the back-valve cavities of the drain and discharge valves to the drain and discharge lines), the first of which periodically connects the back-valve cavity of corresponding valve to the discharge line, and the second one periodically connects the back-valve cavity of corresponding valve to the drain line, are additionally installed in the control lines. Whereupon, switching of each pair of the pilot-controlled valves is performed directly by a separate four-port on/off control valve.

EFFECT: method increases the frequency response of the hydraulic motor of a pile-driving hammer and, consequently, increases the frequency of hammer strokes.

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