Electrohydraulic hammer

Abstract

The electrohydraulic hammer includes a frame, a hammer stem driving cylinder, a hydraulic source, a hammer stem with hammer head in the lower end and upper end connected to the piston inside the hammer stem driving cylinder, an upper cylinder chamber and a lower cylinder chamber in the ends of the piston, and an operating valve with valve body, a servo valve inside the valve body and valve core capable of sliding inside the servo valve. When the valve core is in different position inside the servo valve, the operating valve can close the oil inlet passage of the upper cylinder chamber, the oil exhaust passage, or both the oil inlet passage and the oil exhaust passage. Between the driving cylinder and the operating valve, there is one buffering cylinder with excellent buffering effect to avoid bumping top after the hammer head reaches the top dead point.

Description

technical field [0001] The invention relates to an electro-hydraulic hammer, in particular to a hydraulic electro-hydraulic hammer used for forging and piling machinery and other hydraulically driven mass blocks to perform work. Background technique [0002] The existing fully hydraulically driven electro-hydraulic hammer has a structure that the lower chamber of the hammer rod piston is normally connected with high-pressure oil, and the oil in the upper chamber of the hammer rod piston is controlled by the control valve to achieve the strike and return of the forging hammer. For example, the patent number is The patents of 93120993.5 and 02218450.3 are two technical solutions disclosed in the book. The principles of these two technical solutions are basically the same, but the structure and principle of the control valve are different. The application number is 93120993.5. The patent uses hydraulic pressure to directly drive the piston, and the piston rod drives the cone va...

AI Technical Summary

Problems solved by technology

All actions of the forging hammer require two sets of control systems, which are relatively complicated and cannot achieve stepless speed regulation

The patent application number is 02218450.3. The system is relatively simple, but it cannot realize slow down and slow up motions, nor can it stop the hammer at any position. The hammer rod can only be stabilized at the upper dead point or the lower dead point. None of the technical solutions can realize stepless speed regulation, so the return speed is uncontrollable, so it is difficult to realize the light strike and fast strike of the forging hammer, and when the hammer head returns to the top dead center, it is easy to appear the top collision phenomenon, which is the prior art Achilles' heel

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