Vibratory Compactor Independent Shaft Control
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Solution Overview
Problem
Existing soil compacting machines with vibration exciters lack the ability to independently control rotational speed and phase position of unbalanced shafts, limiting the variety of excitation functions and compaction modes.
Innovation Solution
A soil compacting machine with a vibration exciter that allows each unbalanced shaft to be controlled independently via its associated motor, enabling adjustable rotational speed and phase position, and the ability to change the direction of rotation, thereby enabling multiple operating modes such as circular, oscillating, and directed vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mechanical or hydraulic coupling is used between the two unbalance shafts, then the device complexity is reduced, but the adaptability and versatility of vibration modes are limited
Solution Approach 1:
The patent divides the drive system into two independent motor-unbalance shaft pairs, where each unbalance shaft (first unbalance shaft and second unbalance shaft) can be controlled independently by its own motor. This segmentation allows each shaft to operate with independent rotational speed and phase angle control, enabling a wide variety of vibration modes and excitation functions without requiring complex mechanical or hydraulic couplings between the shafts.
2Productivity
If the rotational speed of unbalance shafts is increased to improve compaction efficiency, then the productivity increases, but the risk of vibration-induced damage to bearings increases
Solution Approach 1:
The patent employs periodic action by enabling the unbalance shafts to operate in alternating patterns. In certain operating modes, one unbalance shaft can be stationary or rotate at low speed while the other operates at high speed, allowing the bearing system to periodically rest and rebuild lubricating films. This periodic alternation reduces cumulative vibration damage to bearings while maintaining high productivity during active compaction phases.
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
This design allows for a wide range of vibration modes, enhancing compaction performance by adapting to different requirements and reducing the risk of vibration-induced damage to bearings through lubrication in certain modes.
Implementation Method 1
Each unbalance shaft can be controlled independently via its associated motor
Implementation Method 2
The vibration exciter enables a large number of excitation functions... both the rotational speed and the phase angle of each unbalance shaft can be set independently
Implementation Method 3
reducing the risk of vibration-induced damage to bearings through lubrication in certain modes
Data Source
Figure 1a
Figure 1b~1c
Figure 2
AI summary
Soil compaction machine, in particular a vibratory compactor, comprising a vibration exciter for generating different excitation vibrations with a first and a second unbalanced shaft (10, 10') arranged parallel to each other. Each unbalanced shaft (10, 10') is driven by its own motor (12, 12') so that the rotational speed, direction of rotation and phase of each of the unbalanced shafts (10, 10') can be changed separately.