Vibration Exciter Phase Shifter Design
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Solution Overview
Problem
Existing vibration generators for pile drivers face inefficiencies due to the need for a large pivot motor to transfer drive moment and the complexity of gear wheel arrangements, leading to increased component depth and reduced efficiency.
Innovation Solution
A vibration exciter design with four parallel shafts, where outer and inner imbalance masses form synchronized torsionally rigid groups, allowing phase adjustment without drive moment transfer, using a pivot motor solely for synchronization and phase shifting, and employing hydraulic drive motors with adjustable displacement to minimize stress on the phase shifter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a large pivot motor is used to transfer drive moment, then the drive moment transfer is sufficient, but the component depth increases and efficiency decreases
Solution Approach 1:
The patent extracts the drive moment transfer function from the pivot motor by introducing a separate drive mechanism for the imbalance groups. The pivot motor is now only responsible for phase adjustment, while the drive moment is transferred through a dedicated drive shaft and gear system, eliminating the need for an oversized pivot motor.
Solution Approach 2:
The patent segments the functions of the pivot motor and the drive system. The pivot motor handles only phase adjustment, while a separate drive system (drive shaft, drive gears) handles moment transfer. This functional segmentation allows each component to be optimized for its specific task, reducing overall component depth.
2Stability of the object's composition
If three rows of gear wheels are used for synchronization, then the imbalance groups are synchronized, but the component depth increases and efficiency decreases
Solution Approach 1:
The patent extracts the synchronization function from the gear wheel arrangement by using a dedicated phase shifter mechanism. The gear wheels now only need to provide one row for drive moment transfer, while synchronization is achieved through the phase shifter, reducing the number of gear rows from three to one.
Solution Approach 2:
The patent introduces a phase shifter as an intermediary mechanism between the drive shaft and the imbalance groups. This phase shifter handles the synchronization function, allowing the gear wheels to be minimized to a single row for drive moment transfer only.
3Adaptability or versatility
If the pivot motor transfers drive moment, then the imbalance groups can be coupled, but the pivot motor requires large-volume design
Solution Approach 1:
The patent segments the functions of coupling and phase adjustment. The drive shaft and gear system handle the coupling and drive moment transfer, while the pivot motor is dedicated solely to phase adjustment. This segmentation allows the pivot motor to be small in volume while maintaining full coupling capability through the separate drive system.
Solution Approach 2:
The patent extracts the drive moment transfer function from the pivot motor, leaving only the phase adjustment function to the pivot motor. The drive moment is transferred through a separate drive shaft and gear system, allowing the pivot motor to be designed with minimal volume for its specific phase adjustment task.
4Stability of the object's composition
If multiple rows of gear wheels are used, then the imbalance groups are synchronized, but the component depth increases
Solution Approach 1:
The patent introduces a phase shifter as an intermediary mechanism that handles synchronization independently of the gear wheel arrangement. This allows the gear wheels to be reduced to a single row for drive moment transfer, while the phase shifter provides the necessary synchronization, thereby minimizing component depth.
Data Source
AI summary
A vibration exciter, particularly for a vibration pile driver, includes at least four shafts disposed parallel to one another, on which two outer imbalance masses are disposed, in each instance, between which a central imbalance mass is positioned. The central imbalance mass is mounted on the shaft so as to rotate relative to the outer imbalance masses, in each instance. The imbalance masses of the at least four shafts are combined into two imbalance groups, the imbalance masses of which are all synchronized with one another in torsionally rigid manner, in each instance, wherein not only outer imbalance masses but also inner imbalance masses are provided in each of the two imbalance groups, and wherein a phase shifter is provided, by way of which the phasing of the two imbalance groups relative to one another can be adjusted.