7-Axis Robot Straight Arm Alternating Layout
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Solution Overview
Problem
Conventional 7-axis robots face limitations in operating range and structural integrity due to bent arm parts and complex cable routing, leading to stress concentration and increased costs.
Innovation Solution
A 7-axis robot design featuring straight arm parts and alternating arrangement of components along a second axis, with actuators and cables disposed on opposite sides, allowing for enhanced operating range, reduced stress, and simplified manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If arm parts are bent in a crank manner to reduce lateral position difference, then cable routing becomes simpler, but operating range is limited and stress concentration increases
Solution Approach 1:
Instead of bending the arm parts to accommodate cable routing, the patent inverts the approach by keeping arm parts straight and routing cables along the exterior surfaces of the arm parts. This allows the cables to follow the natural straight geometry of the arms without creating stress concentrations or limiting the operating range.
2Device complexity
If actuators are disposed on side surfaces with complex cable routing, then component arrangement is compact, but manufacturing complexity and costs increase
Solution Approach 1:
The patent extracts the cable routing from the interior of the arm parts and places it on the exterior surfaces. This separation allows for simpler manufacturing of the arm parts themselves while the cable routing becomes an independent external feature that can be implemented through surface grooves or channels.
3Area of stationary object
If arm parts are bent to reduce lateral position difference, then overall structure is more compact, but stress concentration and reduced structural integrity occur
Solution Approach 1:
The patent segments the robot structure into distinct functional components (base, arm parts, actuators, cables) arranged along the longitudinal axis. This segmentation allows each component to maintain its optimal geometry - straight arm parts for strength and compact actuators - without requiring bent configurations to achieve compactness.
Data Source
AI summary
A robot includes: a turning part rotated about a first axis; a first arm part rotatably connected to the turning part about a second axis perpendicular to the first axis; a second arm part rotatably connected to the first arm part about a third axis; a distal-end swing part rotatably connected to the second arm part about a fourth axis; actuators rotating the first arm part, the second arm part, and the distal-end swing part about the second to fourth axes, which are parallel to each other, respectively; and a cable for the actuators. The turning part, the first arm part, the second arm part, and the distal-end swing part are alternately arranged at one or the other side in the direction of the second axis. The cable is disposed along side surfaces at the one side. The actuators are disposed close to side surfaces at the other side.