Liquid Handling Device Y-Axis Drive Mechanism
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Solution Overview
Problem
Existing liquid handling devices face challenges in adapting to varying dimensions and application areas, leading to issues with dynamic behavior and cable management, particularly affecting the Y slide's performance and the overall working range.
Innovation Solution
The liquid handling device redesigns the Y slide's drive system to reduce moving mass, allowing for quicker acceleration and braking, and enables longer unsupported lengths by eliminating the Y-drive motor's weight, allowing the Y-axis to be non-self-supporting and supported at its opposite end, while using the same stepping motors for both X and Y axes to reduce component diversity and cable complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the Y-drive motor is mounted on the X-carriage to enable independent Y-axis driving, then the Y-axis can be driven independently of the X-axis position, but the moving mass of the X-carriage increases, deteriorating the dynamic behavior and requiring greater forces for acceleration and deceleration
Solution Approach 1:
The Y-drive motor is extracted from the moving X-carriage and relocated to a stationary position on the housing. This removes the detrimental moving mass from the X-carriage while preserving the independent Y-axis driving capability through a different mechanical arrangement where the stationary motor drives the Y-axis via a belt mechanism.
Solution Approach 2:
A stationary drive mechanism acts as an intermediary between the stationary Y-drive motor and the moving Y-carriage. The motor remains fixed on the housing while transmitting power through a belt system to drive the Y-axis, eliminating the need for the motor to be mounted on the moving carriage.
2Length of moving object
If the X-axis length is increased to expand the working range, then more sample containers can be accessed, but the power and data lines for the Y-drive motor must be made longer, increasing complexity and potential obstructions
Solution Approach 1:
The Y-drive motor is extracted from the moving X-carriage and relocated to a stationary position on the housing. This eliminates the need for long power and data lines that would otherwise be required to supply the motor when it is mounted on the moving carriage, thereby reducing cable complexity and potential obstructions in the installation space.
3Adaptability or versatility
If the Y-drive motor is carried on the X-carriage, then independent Y-axis control is achieved, but the power and data lines may obstruct other drive components, especially in end position areas
Solution Approach 1:
The Y-drive motor and its associated power and data lines are extracted from the moving X-carriage and relocated to a stationary position on the housing. This eliminates the obstructions caused by cables running along the moving carriage, particularly in the end position areas where other drive components are located.
Solution Approach 2:
Instead of mounting the motor on the moving carriage (mobile drive), the invention inverts the approach by using a stationary motor on the housing that drives the moving Y-carriage through a belt mechanism. This reverses the traditional arrangement and eliminates cable obstruction issues.
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 design enhances the X carriage's dynamic behavior, increases the working range, reduces cable requirements, and allows for a more compact housing, enabling simultaneous use of multiple Y-carriages and working heads for various operations.
Implementation Method 1
The X-carriage is driven by an X-drive motor via an X-drive power transmission element in the form of a toothed belt
Implementation Method 2
the Y-carriage is driven by a Y-drive motor via a Y-drive power transmission element, which can be a toothed belt or a rotary spindle
Implementation Method 3
The same stepping motors are used for the X and Y axes
Data Source
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AI summary
The invention relates to a liquid handling device for transporting liquid into and out of containers, which are arranged on a substantially horizontal plane defined by an x-axis and a y-axis perpendicular to the x-axis, in the direction of a substantially vertical z-axis perpendicular to said plane. The liquid handling device comprises an x-slide which can be moved in the direction of the x-axis and on which an arm with a y-slide is provided that can be moved in the direction of the y-axis, said slide being designed for optionally attaching at least one z-slide which can be moved in the z-axis. An x-drive motor is used to drive the x-slide via an x-force transmission means, and a y-drive motor is used to drive the y-slide via a y-force transmission means. Both motors are stationary. The y-force transmission means is coupled to the x-slide such that a displacement movement of the x-slide imprints a displacement movement onto the y-slide, and an additional displacement movement is imprinted onto the y-slide via the y-drive motor such that any position of the y-slide can be reached. Each x-force transmission means comprises a belt, in particular a toothed belt, and each y-force transmission means comprises a belt, in particular a toothed belt, and a rotating spindle.