Free-Piston Engine Vibratory Plate Mechanism
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Solution Overview
Problem
The conversion of reciprocating motion from pistons into rotational motion in vibratory plate machines complicates the mechanism, increases weight and dimensions, and reduces the power-to-weight and size ratio, leading to inefficiency and reliability issues.
Innovation Solution
A free-piston engine with an unbalanced piston is used to drive the vibratory plate, where the piston's reciprocating motion causes the cylinder to move oppositely, transmitting periodic forces for soil compaction, with the cylinder mounted vertically on the plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reciprocating motion of pistons is converted into rotational motion of crankshaft and then into reciprocating motion of plate, then the vibratory plate can compact soil, but the mechanism becomes complex and weight increases
Solution Approach 1:
The patent extracts and eliminates the intermediate rotational motion conversion mechanism (crankshaft, pulley, vibration mechanism with unbalanced masses) from the system. By directly coupling the piston's reciprocating motion to the plate through the cylinder, the design removes unnecessary components while maintaining the compaction function, thereby reducing complexity and weight.
Solution Approach 2:
The patent merges the functions of the piston, cylinder, and plate into a directly coupled system. The cylinder is mounted on the plate such that the piston's reciprocating motion directly translates to plate motion without intermediate conversion mechanisms, combining multiple functions into a unified direct-action system.
2Reliability
If reciprocating motion is converted through crankshaft and vibration mechanism, then plate vibration is achieved, but weight and dimensions increase
Solution Approach 1:
The patent removes the heavy intermediate mechanisms (crankshaft, pulley system, unbalanced masses) that were previously required to convert reciprocating motion to plate vibration. The direct coupling of piston to plate through the cylinder eliminates these unnecessary weight-bearing components while maintaining vibration functionality.
3Reliability
If multiple conversion stages are used from reciprocating to rotational to reciprocating motion, then plate compaction is achieved, but power-to-weight ratio decreases
Solution Approach 1:
The patent extracts and eliminates the intermediate rotational motion stage and vibration mechanism from the power transmission path. By directly transmitting the piston's reciprocating force to the plate through the cylinder, the design removes energy losses and weight associated with intermediate conversions, thereby improving the power-to-weight ratio while maintaining compaction effectiveness.
4Reliability
If complex motion conversion mechanisms are used, then vibratory function is achieved, but efficiency and reliability reduce
Solution Approach 1:
The patent merges the piston, cylinder, and plate into a directly coupled system where the piston's reciprocating motion directly drives the plate vibration. This eliminates intermediate conversion stages that caused energy losses and reliability issues, improving operational efficiency while maintaining the vibratory compaction function.
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 configuration simplifies the mechanism, reduces weight and size, and enhances the power-to-weight ratio, improving efficiency and reliability by directly converting piston motion into effective compaction forces.
Implementation Method 1
the piston in the cylinder reciprocates between the heads (between the covers, between the ends) of the cylinder. At the same time, according to the laws of mechanics, the cylinder also moves reciprocally, and its movements are opposite to the movements of the piston
Implementation Method 2
After combustion, the gas pressure acts on the piston and on the cylinder. The piston moves up, and the gas pressure on the cylinder head is transmitted down to the plate
Implementation Method 3
Consider combustion in the cylinder when the piston is 'down ', at bottom dead center, near the bottom cylinder head. After combustion, the gas pressure acts on the piston and on the cylinder
Data Source
AI summary
In vibratory plates (vibratory plate compactor machine), the reciprocating movement of an engine piston is converted into rotation of the crankshaft, and the latter is converted into rotation of an eccentric rotary shaft of vibrator unit, which create a periodic force that leads to reciprocating movement of the plate. Such a vibratory plate is complicated. It is proposed to use a free-piston engine with one piston as the engine for a vibratory plate. In this free piston engine, the piston moves reciprocally, and the cylinder performs reciprocating movements opposite to the movements of the piston. The cylinder is mounted vertically and fixed to the plate. In each engine cycle the gas pressure acts on the piston and cylinder. After combustion, the piston moves up and the cylinder moves down. Since the cylinder is fixed to the plate, it also moves downward and compacts soil, gravel, etc.