Concrete Trowel Quick-Change Coupling for Safe Rotor Maintenance
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Solution Overview
Problem
Existing powered concrete trowels require complex maintenance procedures, including the removal of mechanical fasteners to access and clean the rotor and blades, which is difficult and often leads to safety hazards.
Innovation Solution
The concrete trowel incorporates a quick-change coupling system, featuring a pull-through clamp with a spring mechanism that allows for easy attachment and detachment of the rotor from the drive hub, enabling quick removal and servicing without the need to access internal components through the cage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional mechanical fasteners are used to secure the rotor to the drive hub, then the rotor is firmly attached during operation, but the maintenance process becomes complex and hazardous requiring disassembly through the cage structure
Solution Approach 1:
The coupling system is divided into separate components: a coupling member on the drive hub and a corresponding coupling feature on the rotor. These segments can be easily engaged and disengaged without complex disassembly, allowing maintenance personnel to service the rotor by removing only the coupling member rather than disassembling the entire cage structure.
Solution Approach 2:
The coupling member acts as an intermediary element between the drive hub and the rotor. It provides a standardized interface that simplifies the connection and disconnection process, enabling easy removal of the rotor for maintenance while ensuring reliable torque transmission during operation through the spring-loaded engagement mechanism.
2Strength
If complex fastening mechanisms are used to secure internal components, then the components remain firmly in place during operation, but the maintenance time and tool requirements increase
Solution Approach 1:
The spring-loaded coupling member automatically engages with the coupling feature on the rotor when the rotor is installed, and automatically disengages when the coupling member is removed. This self-service mechanism eliminates the need for complex manual fastening operations and specialized tools, reducing maintenance time while ensuring proper securing force through the spring mechanism.
Solution Approach 2:
The traditional mechanical fastening system with multiple bolts and fasteners is replaced with a spring-loaded coupling member that uses elastic deformation and geometric interlocking. This substitution maintains the necessary securing force while dramatically simplifying the attachment and detachment process, eliminating the need for specialized maintenance tools.
3Power
If the rotor is firmly secured to the drive hub, then power transmission is efficient, but the rotor cannot be quickly removed for cleaning and maintenance
Solution Approach 1:
The coupling system transitions from a static permanent connection to a dynamic removable connection. The spring-loaded coupling member maintains firm engagement during operation for efficient power transmission, but can be quickly released and removed when maintenance is required, enabling the rotor to be detached without complex disassembly procedures.
Solution Approach 2:
The coupling member is pre-configured with the spring mechanism and engagement features before installation. When the rotor needs maintenance, the coupling member can be quickly released by simply removing it from the coupling feature, without requiring preliminary disassembly of the cage structure or other components. This preliminary preparation of the coupling interface enables rapid maintenance operations.
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 quick-change coupling system simplifies maintenance by allowing the rotor and blades to be removed as a unit, reducing the risk of accidents and the need for specialized tools, thereby enhancing user safety and efficiency.
Implementation Method 1
the pull-through clamp includes a spring that remains on the drive hub when the attachment portion of the rotor is removed from the quick-change coupling
Data Source
AI summary
A concrete trowel including: a frame including a blade guard extending therefrom; a drive assembly including a motor mounted on the frame and a drive hub configured to receive torque from the motor; a rotor rotatable about a rotational axis within the blade guard and including a plurality of blades and an attachment portion for selectively engaging the drive hub; and a quick-change coupling for selectively attaching the rotor and the drive hub for co-rotation therewith, wherein the quick-change coupling includes: a pull-through clamp configured to fit through the attachment portion of the rotor and imparts a clamping force on the attachment portion along the rotational axis of the rotor to clamp the rotor to the drive hub along the rotational axis, wherein the pull-through clamp includes a spring that remains on the drive hub when the attachment portion of the rotor is removed from the quick-change coupling.