Hydraulic Hammer Pressure Valve Buffer Deactivation
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Solution Overview
Problem
Fluid-powered impact devices unintentionally shut off when the hammer piston penetrates into a hydraulic stop buffer due to increased pressure, caused by the piston passing its theoretical impact area, leading to unintended deactivation.
Innovation Solution
The control valve or pressure-limiting valve remains deactivated until the hammer piston is moved out of the hydraulic stop buffer, with the pressure in the signal line reduced by connecting it to the return line and throttling or disconnecting the supply line, ensuring deactivation only in extreme situations, and reactivating when normal pressure levels are restored.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure-limiting valve is activated when the piston penetrates into the hydraulic stop buffer, then the device is protected from overpressure, but the hammer unintentionally shuts off during normal operation
Solution Approach 1:
A signal line acts as an intermediary between the main pressure line and the pressure-limiting valve. The signal line transmits pressure information to the valve while being decoupled from the main hydraulic circuit, allowing the valve to respond to buffer penetration without directly blocking the main pressure supply to the hammer piston.
Solution Approach 2:
The hydraulic system is segmented into a main pressure line supplying the hammer and a separate signal line controlling the pressure-limiting valve. This segmentation allows independent control: the main line continues supplying pressure during buffer penetration while the signal line triggers valve deactivation only when necessary.
2Stress or pressure
If the control valve deactivates the impact mechanism when pressure exceeds maximum value, then overpressure is prevented, but the device cannot operate when piston passes theoretical impact area
Solution Approach 1:
The signal line serves as an intermediary that selectively transmits pressure signals to the pressure-limiting valve. It allows the valve to monitor pressure conditions and deactivate only when the piston enters the stop buffer, while permitting normal operation when the piston passes the theoretical impact area during material engagement.
Solution Approach 2:
The pressure monitoring function is localized to specific regions: the signal line is positioned to detect pressure changes specifically when the piston penetrates the hydraulic stop buffer, rather than responding to all pressure variations during normal hammer operation.
3Reliability
If the pressure line is blocked to prevent overpressure, then device protection is achieved, but the hammer piston cannot be moved out of the buffer
Solution Approach 1:
The hydraulic system is divided into a main pressure line and a signal line. When the pressure-limiting valve deactivates, it blocks only the signal line, not the main pressure line. This allows the hammer piston to remain pressurized and movable via the main line while the signal line is blocked for protection.
Solution Approach 2:
The signal line acts as an intermediary control path that can be independently blocked by the pressure-limiting valve without affecting the main pressure supply. This enables selective deactivation: the valve blocks the signal to prevent overpressure while leaving the main pressure line open for piston movement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents unintended deactivation of the hydraulic hammer by maintaining the pressure-limiting valve active during normal operations, allowing safe movement out of the buffer and protecting the device from excessive pressure.
Implementation Method 1
The impact mechanism is provided with a hydraulic stop buffer for decelerating the hammer piston when a predetermined impact area is passed
Implementation Method 2
The gas pressure in the chamber acts as an additional force on the piston in direction of the advance stroke
Implementation Method 3
the spool valve mentioned above which is preferably positioned in the cover either connects the actuator face with larger dimensions to the supply line such that the operating pressure is applied to it or during the return stroke depressurizes the surface
Data Source
AI summary
The invention relates to a striking device (5) comprising a striking mechanism (8) which is driven by a pressure medium. Said device comprises a percussion piston (13) which can be displaced back and forth by means of a control device and a control valve which is embodied as a pressure shut-off valve (19) or as a stop valve, said control valve automatically stopping the striking mechanism if it exceeds a predetermined maximum value based on the working pressure controlling the inlet line, blocking the pressure line (3) or maintaining the control device in one of the and positions thereof. The inventive striking device also comprises a hydraulic catcher buffer which is used to brake the percussion piston when it exceeds a predetermined impact plane. According to the invention, the control valve must remain deactivated at least as long as the percussion piston is displaced on the hydraulic catcher buffer.