Resonant Piston Vibration Control for Construction Machines
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Solution Overview
Problem
Existing vibration generators for construction machines are time-consuming and cost-intensive to produce, with limited flexibility in changing vibration frequency and percussion energy, which are often predefined by the duct layout and require laborious mechanical reworking.
Innovation Solution
A device and method for generating percussive pulses or vibrations that adjust the piston movement frequency to match the resonance frequency of the overall arrangement, including the piston and pressure fluid, allowing for dynamic adaptation of parameters in real-time to optimize vibration and percussion performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the duct layout is used to define vibration frequency and percussion energy, then the device structure is simplified, but the adaptability of vibration parameters is limited and mechanical reworking is required for changes
Solution Approach 1:
The patent replaces the mechanical duct layout system with an electronic control system. A control unit electronically controls controllable valves (such as solenoid valves) to regulate pressure fluid supply to the piston, enabling dynamic adjustment of vibration frequency and percussion energy without mechanical reworking of ducts. This substitution allows parameter changes through electrical signals rather than physical modifications.
Solution Approach 2:
The patent introduces dynamic controllability to the previously static duct layout system. The controllable valves can be actuated in real-time to change the timing and duration of pressure fluid supply to the piston, enabling dynamic adjustment of vibration characteristics. This allows the system to adapt to different application requirements without physical reconfiguration.
2Adaptability or versatility
If mechanical control means are used to change vibration frequency and percussion energy, then parameter adjustment is possible, but production time increases and costs become higher
Solution Approach 1:
The patent replaces complex mechanical control means with an electronic control system. The control unit uses electrical signals to actuate controllable valves, eliminating the need for complex mechanical linkages, levers, and adjustment mechanisms. This electronic approach simplifies manufacturing while maintaining full parameter adjustability.
Solution Approach 2:
The patent enables parameter adjustment through changes in electrical control signals rather than mechanical reconfiguration. By varying the timing, duration, and frequency of electrical signals to the controllable valves, the system can dynamically adjust vibration frequency and percussion energy without any physical changes to the device structure.
3Ease of operation
If the piston mass is used to determine vibration frequency, then the system is simple to operate, but the frequency and stroke can only be changed to a limited extent
Solution Approach 1:
The patent replaces mass-based frequency determination with electronic control. The control unit precisely controls the timing and duration of pressure fluid supply to the piston, enabling independent adjustment of vibration frequency and stroke length without being constrained by piston mass. This electronic approach maintains operational simplicity while dramatically expanding the adjustable parameter range.
Solution Approach 2:
The patent enables independent variation of vibration frequency and stroke length through electronic control parameters. By adjusting the timing and duration of pressure fluid supply controlled by the controllable valves, the system can achieve a wide range of vibration characteristics without changing the physical mass of the piston, thereby maintaining simplicity while expanding versatility.
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
The solution enables efficient and versatile vibration generation, allowing for a wide range of applications by dynamically adapting parameters such as pressure fluid characteristics and valve settings, resulting in improved penetration and drilling efficiency.
Implementation Method 1
a pressure fluid supply, through which pressure fluid can in each case be led into and out of the working space in the region of the first reversal point and the second reversal point
Implementation Method 2
the control unit is designed to move the piston at a frequency that corresponds to a resonance frequency of an overall arrangement comprising the piston and the pressure fluid
Data Source
AI summary
The invention relates to a device and a method for generating percussive pulses or vibrations for a construction machine, with a housing, a piston which is reversibly reciprocable in a working space in the housing between a first reversal point and a second reversal point, a pressure fluid supply, through which pressure fluid can in each case be led into and out of the working space in the region of the first reversal point and the second reversal point, wherein the piston can be set into the reversible movement in order to generate the percussive pulses or vibrations, at least one controllable valve, through which the pressure fluid can be led into and/or out of the working space, and a control unit which is connected to the at least one controllable valve, wherein by the control unit the movement of the piston in the working space can be controlled and changed. According to the invention provision is made in that the control unit is designed to move the piston at a frequency that corresponds to a resonance frequency of an overall arrangement comprising the piston and the pressure fluid.