Hydraulic Hammering Device Shared Spool Mode Selection
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Solution Overview
Problem
Existing hydraulic hammering devices require complex circuit configurations and increased costs to integrate both auto-stroke and idle strike prevention mechanisms, making them unsuitable for versatile applications such as natural ground drilling and crushing work.
Innovation Solution
A hydraulic hammering device with a shared spool in the second control valve that allows for easy selection between auto-stroke and idle strike prevention mechanisms, using a mode selection means to control the supply and discharge of pressurized oil, enabling both mechanisms to coexist with a simple circuit configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both auto-stroke mechanism and idle strike prevention mechanism are integrated into one hydraulic breaker, then the device can be used for both natural ground drilling and crushing work, but the circuit configuration becomes complex and cost increases
Solution Approach 1:
The patent implements a universal control valve that can perform both auto-stroke control and idle strike prevention functions through a single device. The control valve is designed with multiple oil passages and a spool that can be positioned in different states to achieve different functions, eliminating the need for separate control valves for each mechanism.
Solution Approach 2:
The patent merges the auto-stroke mechanism and idle strike prevention mechanism into a single integrated system. By combining both mechanisms in one hydraulic breaker with a unified control valve, the circuit configuration is simplified compared to having separate systems, while still providing both functionalities.
2Adaptability or versatility
If both auto-stroke mechanism and idle strike prevention mechanism are integrated into one hydraulic breaker, then the device can be used for both natural ground drilling and crushing work, but cost increases
Solution Approach 1:
The control valve is designed as a multi-functional component that handles both auto-stroke and idle strike prevention operations. This universal design reduces the total number of components needed, thereby lowering manufacturing costs compared to equipping the breaker with separate control valves for each function.
Solution Approach 2:
By merging both mechanisms into a single integrated system with shared components, the overall device complexity is reduced, leading to lower manufacturing and maintenance costs while maintaining versatility for different applications.
3Device complexity
If a shared spool is used in the control valve to enable mode selection, then both mechanisms can coexist with simple circuit configuration, but the control mechanism becomes more complex
Solution Approach 1:
The control valve employs a dynamic spool mechanism that can be positioned in different states (first state for auto-stroke, second state for idle strike prevention) to switch between functions. This dynamic positioning allows a single component to perform multiple roles, simplifying the overall circuit while providing clear operational modes.
Solution Approach 2:
The system incorporates feedback mechanisms where the position of the spool and the state of the hydraulic system provide information that helps maintain stable operation in each mode. The control valve responds to system conditions to ensure proper functioning of the selected mechanism.
Data Source
AI summary
A hydraulic hammering device enables an auto-stroke mode and an idle strike prevention mode to coexist with a simple circuit configuration. The device includes a first control valve to control advancing and retracting movements of a piston, an auto-stroke mode and an idle strike prevention mode, and a second control valve to select either of the auto-stroke mode or the idle strike prevention mode. To the second control valve, a shared spool is slidably fitted and a mode selection means is disposed. When the mode selection means allows supply of pressurized oil to an auto-stroke setting portion of the shared spool and prohibits discharge of pressurized oil from an idle strike prevention setting portion, the auto-stroke mode is selected. When prohibiting supply of pressurized oil to the auto-stroke setting portion and allowing discharge of pressurized oil from the idle strike prevention setting portion, the idle strike prevention mode is selected.