Electric Excavation Drum Drive for Low-Loss Diaphragm Trenching
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Solution Overview
Problem
Existing excavation tools for deep panel or diaphragm construction face inefficiencies due to energy dissipation in hydraulic power lines, inadequate starting torque, and space constraints, leading to reduced performance and increased maintenance needs.
Innovation Solution
The use of a brushless electric motor with a mechanical reducer and a cooling system, eliminating hydraulic hoses and incorporating a cycloidal mechanical reducer, allows for efficient power transmission and reduced maintenance, enhancing excavation performance and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If hydraulic power lines are used to transmit power to the excavation tool, then power can be supplied to the excavation drums, but energy is dissipated due to friction in the hydraulic lines
Solution Approach 1:
The patent replaces the hydraulic power transmission system with an electric motor system. Instead of using hydraulic hoses to transmit power from the base machine to the excavation tool, the invention installs a brushless electric motor directly on the excavation tool that converts electrical energy to mechanical energy to drive the excavation drums. This substitution eliminates the hydraulic power lines and the associated energy losses due to friction, while maintaining the ability to supply adequate power to the excavation drums.
2Force
If hydraulic motors are used to drive the excavation drums, then power can be transmitted to the drums, but the starting torque is inadequate
Solution Approach 1:
The patent substitutes hydraulic motors with a brushless electric motor that is capable of delivering high starting torque. The electric motor system provides sufficient torque at startup to overcome the resistance of the excavation drums when they are first engaged with the ground, eliminating the inadequate starting torque problem associated with hydraulic motors.
3Device complexity
If hydraulic hoses are used for power transmission, then power can be delivered to the excavation tool, but space is occupied and maintenance is increased
Solution Approach 1:
The patent extracts and removes the hydraulic hoses from the system by replacing the entire hydraulic power transmission mechanism with an electric motor system. The brushless electric motor is installed directly on the excavation tool, eliminating the need for hydraulic hoses to connect the base machine to the excavation tool. This extraction simplifies the overall system, reduces the number of components requiring maintenance, and improves ease of manufacture.
4Reliability
If the excavation tool is immersed in excavation fluid, then the walls are supported and prevented from collapsing, but the excavation tool and power lines are exposed to harsh environmental conditions
Solution Approach 1:
The patent replaces the hydraulic power transmission system with an electric motor system that is less susceptible to the harmful effects of the excavation fluid environment. The brushless electric motor, being sealed and without external hydraulic connections, is more reliable when immersed in excavation fluid, reducing the risk of fluid infiltration and component failure while maintaining the necessary wall support 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 solution improves excavation efficiency by minimizing energy losses, providing higher power at the excavation wheels, reducing maintenance intervals, and optimizing space, resulting in increased productivity and reduced environmental impact.
Implementation Method 1
almeno un motore elettrico senza spazzole, preferibilmente del tipo brushless, adatti a mettere in rotazione detto almeno un tamburo di scavo
Implementation Method 2
un circuito di raffreddamento per il raffreddamento di detto almeno un motore elettrico
Data Source
AI summary
An excavation tool for making ground excavations for panels and diaphragms includes at least one rotary excavation drum. At least one frame is adapted to support the excavation drum. At least one pump is adapted for suction of an excavation fluid. A brushless electric motor is adapted to put in rotation the at least one excavation drum. At least one mechanical reducer is operationally connected to the electric motor and the at least one excavation drum. The electric motor is installed in the frame and coaxial to the at least one excavation drum. The at least one mechanical reducer is coaxial to the electric motor and the at least one excavation drum. The at least one mechanical reducer is adapted to transfer rotary motion from the electric motor to the at least one excavation drum.