Working principle of the crushing hammer

Working principle of the crushing hammer: the hydraulic oil inlet kinetic energy + the kinetic energy of the upper accumulator push the cylinder rod upward to the compressed nitrogen chamber, push it to the Zui high point, and then the reversing valve switches direction. The hydraulic oil inlet kinetic energy + the kinetic energy of nitrogen compression push the cylinder rod downward quickly to knock the drill rod to complete the crushing work.

Detailed working principle of hydraulic crusher hammer of excavator: detailed working principle of hydraulic crusher hammer I. return acceleration stage: when the piston return starts, the last impact of the piston has ended and is in a state of instantaneous pause. At this time, chamber V2 of the main valve is a low-pressure chamber, while chamber V4 is a constant high-pressure chamber, so the main valve core is at the lower limit position. In this way, the front chamber V1 of the piston is connected with the high-pressure oil through the main valve core, while the rear chamber V3 of the piston is always connected with the oil return chamber, which is a low pressure. Therefore, the piston makes a return acceleration under the action of the high-pressure oil in the front chamber, and compresses the nitrogen in the tail nitrogen chamber at the same time, so as to prevent re compression.

Detailed working principle of hydraulic breaking hammer II. Return braking movement: the piston continues to make return movement upward under the action of high-pressure oil. When the lower side of the middle section of the piston crosses the lower side of the control port, the high-pressure oil in chamber V1 enters chamber V2 of the main valve. Since the hydraulic pressure acting on the main valve core through chamber V2 is greater than that acting on the main valve core through chamber V4, the valve core is forced to start reversing movement. The movement of the valve core gradually reduces the high-pressure oil entering the V1 chamber, so that the return thrust acting on the piston gradually decreases, while the return resistance exerted by the compressed nitrogen becomes larger and larger, and the piston turns to the return braking stage. The valve element will cut off the pressure oil from Zui to V1 chamber, and the piston will soon stop the return movement.

Detailed working principle of hydraulic crusher hammer III. stroke acceleration movement: when the piston stops the return movement, it will immediately turn into the stroke movement stage. At this time, the main valve element has opened the oil circuit from the piston front chamber V1 to the main valve element oil return chamber, so that the oil in the piston front chamber can be discharged smoothly. At this time, the piston starts rapid stroke movement under the action of nitrogen absolute re expansion force. When the piston stroke, the valve element will stay at the upper limit position.

Detailed working principle of hydraulic breaking hammer IV. special state: the piston strikes and stops. Under the action of nitrogen absolute re expansion in the nitrogen chamber, the piston performs quasi equal acceleration (its acceleration gradually decreases). When the upper side of the middle section of the piston crosses the upper side of the control port, the V2 chamber of the main valve core communicates with the return oil, and the V2 chamber becomes a low-pressure chamber. The valve element will start to make a downward reversing movement under the action of high-pressure oil in V4 chamber. At this time, the piston with sufficient energy hits the drill rod to complete the impact action. The valve core continues to move downward. When the valve core moves to the lower limit position, the piston is in the instantaneous pause stage. At this point, the piston has completed a working cycle. Then, the piston rebounds after impact and starts the next working cycle.