Tamping Tool Carrier Vertical Adjustment Control
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Solution Overview
Problem
Existing track maintenance machines with tamping units face challenges in optimizing the lowering motion of tamping tools into a ballast bed, leading to variable penetration depth and potential stress on the machine due to manual speed adjustments and lack of precise control.
Innovation Solution
A control circuit with a controller, setting device, and measuring device is implemented to regulate the vertical adjustment drive of the tool carrier, allowing for optimized acceleration, penetration speed, and braking, minimizing lowering time and protecting the machine and ballast bed, using a pre-control or pre-filter with a mathematical model and iterative learning control to adjust parameters based on real-time conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual speed adjustment is used for lowering the tool carrier, then the operator can adapt to different ballast conditions, but the penetration depth varies and the lowering time is not constant
Solution Approach 1:
A control circuit with a measuring device records the actual lowering motion of the tool carrier and feeds this information back to the controller. The controller compares the recorded motion with the prescribed lowering course and automatically adjusts the vertical adjustment drive to compensate for deviations, ensuring consistent penetration depth while adapting to different ballast conditions through pre-set programs.
Solution Approach 2:
The system transitions from static manual speed selection to dynamic automated control. The control circuit continuously adjusts the lowering speed during the tamping cycle based on real-time feedback, optimizing the lowering motion for each specific ballast condition while maintaining consistent penetration depth through automated regulation.
2Productivity
If the tamping tools are lowered quickly to reach penetration depth, then productivity increases, but the machine experiences additional stress
Solution Approach 1:
The control circuit is pre-programmed with optimal lowering courses that define the prescribed penetration depth and timing. Before each tamping operation, the system loads the appropriate program based on ballast conditions, allowing the lowering motion to follow a pre-optimized trajectory that minimizes both time and stress without requiring real-time operator judgment.
Solution Approach 2:
The system changes the motion parameters (speed, acceleration, braking) of the tool carrier dynamically during the lowering process. The control circuit adjusts these parameters according to the prescribed course, enabling quick penetration when conditions allow while automatically reducing speed to protect the machine when approaching the target depth or encountering resistance.
3Reliability
If vertical vibration is applied to facilitate penetration into hardened ballast, then penetration is improved, but the track maintenance machine experiences additional stressing
Solution Approach 1:
The tamping tools are set in vertical vibrations during the lowering process. This vibration facilitates penetration into hardened ballast by breaking up resistance and allowing the tools to reach the prescribed depth more effectively. The vibration is applied only to the tamping tools through the vibration drive, not to the entire machine frame.
Solution Approach 2:
The vibration function is extracted from the machine frame and applied only to the tamping tools themselves. By placing the vibration drive directly on the tools rather than transmitting vibration through the entire machine structure, the system achieves effective penetration while isolating the machine frame from additional stressing.
4Manufacturing precision
If the lowering motion is controlled with multiple phases (acceleration, penetration, braking), then penetration precision is improved, but the control system complexity increases
Solution Approach 1:
The complex multi-phase lowering motion is pre-programmed into the control circuit before operation. The prescribed lowering course, including acceleration phases, penetration speed, and braking sequences, is stored as a program that the controller executes automatically. This eliminates the need for complex real-time calculations while achieving precise penetration depth control through pre-optimized motion profiles.
Data Source
AI summary
The invention relates to a track maintenance machine having a tamping unit for tamping sleepers of a track lying in a ballast bed, including a tool carrier which is mounted for vertical adjustment on an assembly frame and on which tamping tools are arranged so as to be squeezable towards one another, wherein the tool carrier is coupled to a vertical adjustment drive actuated by means of a control device. In this, a control circuit is set up for controlling a lowering motion of the tool carrier, the control circuit including a controller, a setting device for the vertical adjustment drive and a measuring device for recording the lowering motion. With this, it is possible to provide an optimal course for the lowering motion.