Vibration Exciter Control Piston for Soil Compaction
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Solution Overview
Problem
Existing soil compaction devices with vibration exciters require high steering torques and complex control systems, making them difficult for inexperienced operators to maneuver smoothly, leading to uneven compaction and increased operator effort.
Innovation Solution
A control device for vibration exciters featuring an actuating device with a control piston that adjusts the phase position between unbalanced masses, using a hydraulic system to change the axial position of the piston based on a setpoint input from the operator, allowing for comfortable and precise control without the need for complex sensors or feedback mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a hydraulic system is used to control the phase position of unbalanced masses, then the steering response speed improves, but the system complexity and installation space requirements increase
Solution Approach 1:
The hydraulic system components are nested within the hollow unbalanced shafts. The hollow shafts serve as housing for the hydraulic cylinders and control mechanisms, eliminating the need for separate external hydraulic components. This nesting approach reduces installation space requirements while maintaining the fast steering response capability provided by the hydraulic system.
Solution Approach 2:
The unbalanced shafts serve multiple functions: they provide the structural support for the unbalanced masses, act as hollow conduits for hydraulic fluid passage, and house the hydraulic control mechanisms. This multi-functionality reduces the overall system complexity by combining what would otherwise be separate components into integrated structures.
2Force
If the unbalance masses are positioned closer to the machine center, then the steering torque requirement decreases, but the lever arm length and control precision are reduced
Solution Approach 1:
The phase position of the unbalanced masses is made dynamically adjustable during operation. By continuously varying the phase relationship between the two unbalanced masses through hydraulic control, the system can optimize the lever arm effectiveness without requiring the masses to be positioned far from the center. This dynamic adjustment allows the system to achieve both reduced torque requirements and sufficient control precision.
3Reliability
If remote control is used for operating the vibration plate, then the operator safety improves, but the control precision and responsiveness deteriorate
Solution Approach 1:
Hydraulic control mechanisms are used to adjust the phase position of unbalanced masses in response to operator input. The hydraulic system provides amplified force and precise positioning capability, allowing the operator to achieve fine control adjustments from a remote position. This hydraulic actuation system maintains control precision despite the operator being remotely located.
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
Enables simple, robust, and cost-effective control of soil compaction devices, reducing operator effort and improving compaction quality by allowing for precise adjustment of the phase position between unbalanced masses, thus enhancing steering and compaction performance.
Implementation Method 1
pressurized hydraulic fluid can be supplied to or discharged from a piston chamber enclosed by the cylinder and the control piston by the hydraulic system
Implementation Method 2
two counter-rotating, coupled unbalanced shafts with attached unbalanced masses, the phase relationship of which is adjustable relative to each other. By adjusting the phase relationship, the direction of action of a resulting force vector generated by the rotating unbalanced masses can be changed
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A control device for a vibration exciter (1) comprises an actuating device for adjusting the phase relationship between at least two counter-rotating unbalanced masses (4a, 4b, 10a, 10b) and a setpoint input device (31, 32) for setting and changing a setpoint for the phase relationship by an operator. The actuating device includes a control piston (12a, 12b), wherein the phase relationship of the unbalanced masses is adjustable as a function of the axial position of the control piston (12a, 12b). The axial position of the control piston (12a, 12b) can, in turn, be changed by a hydraulic system (34), wherein pressurized hydraulic fluid can be supplied to or discharged from a piston chamber by the hydraulic system (34) over a specific control period to change the axial position of the control piston (12a, 12b). The length of the control period is determined depending on a change in the target value.