Rope Hoist Relay Nesting in Motor Cover
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Solution Overview
Problem
The existing rope hoist design with a relay terminal box protruding outside the main body increases size and compromises aesthetics.
Innovation Solution
The rope hoist integrates a reduction gear mechanism and a control unit within an end frame member, with a recess in the motor cover housing the relay, allowing the lead wire and cable connection without external projection, thus reducing size and maintaining a neat appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a relay terminal box is provided on the outside of the rope drum mechanism for connecting cables, then the cable connection function is achieved, but the size increases and the appearance becomes less neat
Solution Approach 1:
The relay terminal box is nested within the existing motor cover structure by creating a recess in the motor cover. This allows the relay terminal box to be housed inside the motor cover's internal space rather than projecting externally, achieving cable connection functionality while maintaining a compact overall size and neat appearance.
2Ease of manufacture
If a relay terminal box is provided on the outside of the rope drum mechanism for connecting cables, then the cable connection function is achieved, but the appearance becomes less neat
Solution Approach 1:
The relay terminal box is nested within the existing motor cover structure by creating a recess in the motor cover. This allows the relay terminal box to be housed inside the motor cover's internal space rather than projecting externally, achieving cable connection functionality while maintaining a compact overall size and neat appearance.
Data Source
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AI summary
Provided is a rope hoist that has a neat exterior and can be made in a small size. The rope hoist (1) has a rope drum (10) on which a wire rope can be wound, a drum motor (11) for rotating the rope drum (10), a reduction gear mechanism (12) for reducing the rotation of the drum motor (11) and transmitting the rotation to the rope drum (10), and a control unit (4) for controlling driving of the drum motor (11). The reduction gear mechanism (12) is disposed on the inside of a wall section (125) that is provided extending from a motor cover (20) of a body main unit (13) which is an end frame member supporting the rope drum (10); a lead wire (143) that extends from the drum motor (11) is connected via a relay (22) to a cable (147) that extends from the control unit (4); and the relay (22) is disposed on the outside of the wall section (125) enclosing the reduction gear mechanism (12) and is accommodated inside a recess (21) provided on the motor cover (20).