초록 ▼

A control system for a heavy duty hydraulic hammer reduces blank firing of the hammer. The control system provides a reduced flow of hydraulic fluid to the hammer for a selected period of time upon actuation of the hammer and then provides full hydraulic flow increasing the frequency of impacts to f

A control system for a heavy duty hydraulic hammer reduces blank firing of the hammer. The control system provides a reduced flow of hydraulic fluid to the hammer for a selected period of time upon actuation of the hammer and then provides full hydraulic flow increasing the frequency of impacts to full rated values.

대표청구항 ▼

1. A control for a hydraulic hammer comprising:a source of high pressure hydraulic fluid; a first valve controlling flow of said high pressure fluid to said hammer having a control input; a first shuttle valve having an output, a first input and a second input, said output connected to said control

1. A control for a hydraulic hammer comprising:a source of high pressure hydraulic fluid; a first valve controlling flow of said high pressure fluid to said hammer having a control input; a first shuttle valve having an output, a first input and a second input, said output connected to said control input on said first valve; a second valve, said second valve being a solenoid actuated valve having a first output which will provide fluid at a first selected pressure only when said second valve solenoid is actuated, said first output being connected to said first input of said first shuttle valve; a third valve, said third valve being a solenoid actuated valve having an output which will provide fluid at a second selected pressure only when said third valve solenoid is actuated, said output being connected to said second input on said first shuttle valve; and, an electrical control means responsive to an operator input adapted to provide power to said third valve solenoid for a selected period, discontinue power to said third valve solenoid and provide power to said second valve solenoid, where said first valve provides a reduced flow ofhigh pressure fluid to said hammer for said selected period and full flow of said high pressure fluid thereafter.