Gantry Motion Platform With Central Drive for Synchronized Precision
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Solution Overview
Problem
Existing gantry motion platforms face challenges with high costs due to the need for multiple linear motors and grating rulers, and issues with motion precision and synchronization in bilateral driving modes, while unilateral driving modes suffer from torque imbalances and precision errors.
Innovation Solution
A gantry motion platform design featuring a first transmission mechanism with sliding rails and a central driving member, and a second transmission mechanism with a support beam and sliding block, allowing for synchronized movement along perpendicular directions with improved rigidity and precision, using a ball screw transmission member and pinion/gear or belt transmission for stable and efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If bilateral driving mode with two linear motors and two linear encoders is used, then motion precision and speed are improved, but device cost and complexity increase
Solution Approach 1:
The patent combines two driving functions into a single linear motor by using a first driving member that simultaneously drives both first sliding blocks through a common ball screw mechanism. This merging approach maintains the precision benefits of bilateral driving while reducing system complexity and cost by eliminating redundant motors and encoders.
Solution Approach 2:
The single first driving member performs multiple functions by driving both first sliding blocks simultaneously. The ball screw mechanism acts as a universal transmission component that distributes driving force to both sides of the gantry, making the system more efficient and less complex while maintaining precision.
2Device complexity
If dual ball screw driving device is used, then device cost is reduced, but motion synchronization between two sides deteriorates
Solution Approach 1:
The patent merges the driving sources into a single first driving member that controls both ball screws simultaneously. This ensures that both first sliding blocks move in perfect synchronization since they are driven by the same motor through mechanically coupled ball screws, eliminating the synchronization issues of dual independent ball screw systems.
3Device complexity
If timing belt connection is used to synchronize two Y-direction driving devices, then device cost is reduced, but motion precision and rigidity deteriorate
Solution Approach 1:
The patent extracts and eliminates the timing belt connection from the system by using a direct mechanical coupling through the common ball screw mechanism. This removes the flexible but imprecise timing belt element and replaces it with a rigid mechanical connection that maintains both low complexity and high motion rigidity.
4Device complexity
If unilateral driving mode is used, then device complexity is reduced, but torque imbalance and precision errors occur
Solution Approach 1:
The patent introduces a common ball screw mechanism as an intermediary between the single linear motor and the two first sliding blocks. This intermediary mechanism ensures balanced torque distribution to both sides by providing a rigid mechanical connection that eliminates the torque imbalance and precision errors associated with direct unilateral driving.
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 design enhances motion stability and precision by aligning the driving force with the load's mass center, reduces costs by simplifying components, and improves synchronization, resulting in more efficient and precise multi-axis motion performance.
Implementation Method 1
the ball screw nut is disposed on the seat and screwed to the ball screw, and when the screw nut rotates, the ball screw is driven to move along the first direction
Implementation Method 2
the at least one first sliding block is slidably disposed on the two first sliding rails
Data Source
AI summary
A gantry motion platform includes a base, a first transmission mechanism, a second transmission mechanism and a working platform. The first transmission mechanism is mounted on the base and includes two first sliding rails, at least one first sliding block, and a first driving member. The first driving member is mounted on the base and located at a center position between the two first sliding rails. The second transmission mechanism is mounted on the at least one first sliding block and capable of moving along a first direction under driving of the first driving member. The working platform is mounted on the second transmission mechanism and capable of moving along the second direction under driving of a second transmission mechanism, and an angle is defined between the first direction and the second direction.