Pulsing Compressive Force Arrangement for Asphalt Compaction
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Solution Overview
Problem
Current soil compaction devices face limitations in achieving high compaction performance without lifting the ground contact surface, which is critical for preventing damage to asphalt surfaces during compaction.
Innovation Solution
A soil compaction device with a mass-coupled spring-damper system that temporarily decouples and then re-couples to generate pulsating compressive forces, allowing for significant compaction forces without lifting the contact surface, utilizing an imbalance exciter for resonant oscillations to achieve forces greater than twice the machine weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the ground contact surface is lifted off the ground to achieve higher compaction forces, then compaction performance is improved, but the asphalt surface is damaged due to shattering of mineral material
Solution Approach 1:
The patent implements periodic decoupling of the second mass from the first mass through the spring-damper system. The second mass is temporarily lifted off the first mass during operation, creating periodic pulses of compressive force. This periodic action allows the system to achieve high compaction forces (greater than twice the machine weight) while maintaining continuous contact between the first mass and the ground, thereby preventing asphalt surface damage.
Solution Approach 2:
The patent introduces dynamic elements by allowing the second mass to move relative to the first mass through the spring-damper coupling. The system transitions from a static mass configuration to a dynamic one where the second mass can oscillate and temporarily decouple, creating variable compressive forces that enhance compaction performance without requiring permanent separation from the ground.
2Productivity
If a spring-damper system with absorber mass is used to achieve compaction forces greater than three times machine weight, then compaction performance is improved, but the ground contact surface must be lifted off the ground
Solution Approach 1:
The patent modifies the traditional absorber principle by implementing periodic rather than continuous lifting. The second mass is temporarily and periodically lifted off the first mass during operation, creating pulses of high compressive force. This periodic decoupling allows the system to achieve forces greater than three times the machine weight while maintaining overall continuous contact between the first mass and the ground, making the operation feasible for asphalt compaction.
3Device complexity
If the second mass is permanently decoupled from the first mass, then the system complexity is reduced, but compaction forces are limited to twice the machine weight
Solution Approach 1:
The patent introduces a spring-damper system as an intermediary element between the first mass and the second mass. This intermediary coupling allows the second mass to move and decouple temporarily while maintaining the potential for force transmission. The spring-damper system enables the generation of high compaction forces (greater than twice machine weight) during decoupled phases while keeping the overall structure relatively simple compared to permanent rigid coupling systems.
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 soil compaction forces significantly greater than twice the machine weight during permanent soil contact, preventing asphalt damage while maintaining continuous contact, thus enhancing compaction performance.
Implementation Method 1
an imbalance exciter, by means of which this oscillatable system can be excited to oscillate, preferably to resonant oscillations
Implementation Method 2
the plate or the roller body is made to vibrate by means of an unbalance exciter and thus exerts a pulsating compressive force on the soil
Implementation Method 3
a first spring-damper system, by means of which a second mass is coupled to the first mass to form a first oscillatable system
Implementation Method 4
a first spring-damper system, by means of which a second mass is coupled to the first mass to form a first oscillatable system
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3a~3b
AI summary
The invention relates to an arrangement for providing a pulsing compressive force for ground compacting devices. The arrangement comprises a first mass (1), which provides a contact surface (2) for transferring the pulsing compressive force onto the ground surface (3) to be compacted, and a second mass (4), which is coupled to the first mass (1) via a spring-damper system (5, 6) to form a vibrating system (1, 4, 5, 6). The arrangement further comprises an unbalance exciter (7), by means of which the vibrating system (1, 4, 5, 6) can be excited to vibrate. In addition, in the static state, the second mass (4) exerts a static force on the first mass (1) via the spring-damper system (5, 6), in the direction of gravity (S1). The first mass (1) and the second mass (4) are coupled to one another via the spring-damper system (5, 6) in such a way that no forces can be transferred from the first mass (1) to the second mass (4) in the direction of gravity (S1) and no forces can be transferred from the second mass (4) to the first mass (1) in the direction opposite to the direction of gravity. In addition, the arrangement is designed such that the coupling of the two masses (1, 4) can be temporarily suspended during the intended operation, by a vibratory movement of the second mass (4) opposite to the direction of gravity, the second mass (4) can then execute a part of its oscillation path in the uncoupled state, and the coupling of the masses (1, 4) via the spring-damper system (5, 6) is then reproduced, following a reversal in direction of the vibratory movement of the second mass (4). It has been shown that ground compacting devices can be provided by means of such arrangements according to the invention, which devices generate ground compacting forces during loaded operation (permanent contact with the ground), which, for a short time, are significantly greater than twice the weight of the machine.