Stepless variable auto stroke hydraulic breaker system

A stepless variable auto stroke hydraulic breaker system comprising:

• a vibration sensor configured to detect vibrations generated when a chisel breaks rocks;
• a transmitter provided with the vibration sensor and configured to transmit signals generated from the vibration sensor;
• a receiver configured to receive the signals transmitted from the transmitter;
• and
• a stepless variable auto stroke hydraulic breaker controlled by a reception micro controller unit (MCU) of the receiver, the stepless variable auto stroke hydraulic breaker comprising:
• a cylinder;
• a piston that is housed in the cylinder to axially reciprocate in the cylinder and is provided with a first piston face that is directed such that an applied pressure acts in a return stroke direction, a second piston face directed such that the applied pressure acts in a working stroke direction, and a circumferential recess located between the first piston face and the second piston face;
• a control valve in which a control plunger is located and which is provided with a small control plunger face for moving the control plunger to a return stroke position and a large control plunger face for moving the control plunger to a working stroke position;
• a pressure conduit that provides a working pressure through a first outlet connected to a front chamber of the cylinder;
• an alternating pressure conduit that connects the control valve and a second outlet connected to a rear chamber of the cylinder;
• a switching conduit that connects the large control plunger face and a third outlet of the cylinder which is located between the first outlet connected to the front chamber and the second outlet connected to the rear chamber;
• a reduced pressure return conduit that reduces a pressure through a fourth outlet connected to the cylinder;
• a stroke valve, an input side of which is connected to a stroke control pressure conduit, which is directly connected to the pressure conduit connected to a hydraulic pump, an output side of which is connected to the switching conduit for the control valve by an additional conduit connected to the control valve, and a lower side of which is connected to the hydraulic pump by a flow rate control valve operated under the control of the reception MCU;
• and
• a spring that is installed on an upper side of the stroke valve to provide a mechanical resetting function according to a change in hydraulic pressure,
• wherein when the flow rate control valve is closed under the control of the reception MCU and the stroke valve disconnects the stroke control pressure conduit and the additional conduit, the working pressure is provided to the large control plunger face through the third outlet of the switching conduit so that the piston is operated at a long stroke, and
• wherein when the flow rate control valve is opened under the control of the reception MCU and the stroke valve connects the stroke control pressure conduit and the additional conduit, the working pressure is provided to the large control plunger face through the stroke valve so that the piston is operated at a short stroke.