Pivotable Pinion Holder for Lift Robot Track Turning
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Solution Overview
Problem
Modern logistic centers face inefficiencies in crate distribution due to robot malfunctions and interference, leading to increased delivery times and maintenance costs, which can be minimized by enabling robots to flexibly switch between horizontal and vertical motion modes and optimize navigation.
Innovation Solution
A direction switching module for lift robots, comprising a pivotable-holder with serially mounted pinions that can pivot between horizontal and vertical orientations, coupled to a motor and clutch system, allowing for dynamic velocity control and autonomous direction switching without requiring active rail systems, enabling robots to move in multiple modes without changing spatial orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If robots use fixed motion modes in logistic centers, then the system structure is simple, but robot productivity and navigation flexibility are reduced
Solution Approach 1:
The patent implements dynamic motion mode switching by enabling robots to transition between horizontal and vertical motion modes on demand. The bogie assembly with pivotable pinions allows the robot to dynamically adapt its motion direction based on navigation requirements, transforming a static system into a dynamic one that can respond to changing operational conditions, thereby improving productivity without requiring complete system redesign
Solution Approach 2:
The robot is designed with multi-functionality by incorporating both horizontal and vertical motion capabilities in a single platform. The universal bogie assembly can operate in multiple motion modes (horizontal travel, vertical lifting, and transitional movements), allowing one robot to perform diverse tasks that would otherwise require specialized single-mode robots, thus enhancing productivity while managing complexity through design integration
2Adaptability or versatility
If robots can switch between horizontal and vertical motion modes, then navigation flexibility is improved, but robot interference increases
Solution Approach 1:
The patent applies segmentation by dividing the logistics center into distinct horizontal and vertical operational zones with dedicated track systems. Robots operate primarily in their assigned zones (horizontal robots on horizontal tracks, vertical robots on vertical tracks), reducing cross-interference. The motion mode switching capability allows robots to temporarily enter transition zones when needed, but the segmented zone architecture maintains overall system order and minimizes interference conflicts
3Ease of operation
If active rail systems are used for direction switching, then direction control is precise, but system complexity and maintenance requirements increase
Solution Approach 1:
Instead of using active rail systems that require external actuators mounted on the rails to push or guide robots, the patent inverts the approach by placing the actuation mechanism on the robot itself. The motor-driven pinion system on the bogie assembly actively engages with passive rack teeth on the rails, allowing the robot to control its own direction and motion mode without requiring complex active infrastructure, thereby simplifying the overall system while maintaining precise direction control
Solution Approach 2:
The robot performs self-service in terms of direction control through its autonomous motion mode switching capability. The onboard motor and control system enable the robot to independently select and execute horizontal or vertical motion modes without external intervention or complex rail-based actuation systems. This self-service approach reduces infrastructure complexity while maintaining operational precision
4Adaptability or versatility
If wheel orientation changes during motion mode switching, then directional adaptability is improved, but wheel wear increases
Solution Approach 1:
The patent employs asymmetry in the bogie assembly design where the pinion axes are arranged at specific non-symmetric angles relative to the robot body. This asymmetric configuration allows the pinions to engage with rack teeth at optimal angles during both horizontal and vertical motion modes, enabling directional adaptability while maintaining uniform wheel-rack contact that minimizes wear. The asymmetric geometry ensures that wheels do not undergo excessive orientation changes, reducing friction and wear during mode transitions
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 enhances the flexibility and efficiency of robot navigation, reduces interference between robots, minimizes maintenance time, and allows for simultaneous deliveries with minimal disruption, while maintaining wheel orientation to reduce wear and improve maneuverability.
Implementation Method 1
A pinion-driven lift-robot moves through an array of a plurality of intersecting vertical and horizontal rack-based tracks
Implementation Method 2
the pivotable-holder comprises a pivoting arrangement in a mid-portion thereof and is couplable to a bogie of a lift robot such that the pivotable-holder can pivot about an axis parallel to the axes of the pinions, between a lateral orientation in which the pinions' axes share a horizontal plane and between a vertical orientation in which the pinions' axes share a vertical plane
Data Source
AI summary
A method for turning a pinion-driven lift-robot in an intersection of rails. Moving the pinion-driven lift-robot in a first motion mode to position the pinion-driven lift-robot in a first position at the intersection. The pinion-driven lift-robot is turned over a corner of the intersection that is accessible from the first position and that includes continuous rails connecting a vertical track and a horizontal track, whereby positioning the pinion-driven lift-robot in a second position at the intersection. The pinion-driven lift-robot is moved in a second motion mode towards a designated direction.