Weighing Balance Movable Top Wall Draft Shield
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Solution Overview
Problem
Conventional laboratory weighing balances face challenges in maintaining precision due to air turbulence within the weighing chamber, especially when the door is opened or due to heat dissipation, and have limited flexibility in adjusting the draft shield height and volume, which affects accuracy and operation speed.
Innovation Solution
A weighing balance with a movable mounting unit and top wall, guided by a position control unit along an elongate slot on the rear wall, allowing for adjustable chamber volume and easy removal, replacement, and servicing of accessories, including a dosing device, to mitigate air turbulence and enhance operational flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the volume of the weighing chamber is larger, then the draft shield can better protect against ambient air drafts, but air turbulence inside the chamber increases and takes longer to subside
Solution Approach 1:
The top wall is made movable along the rear wall, allowing the chamber volume to be dynamically adjusted. The position control unit enables the top wall to move between retracted and extended positions, transforming the static chamber into a dynamic one that can adapt to different operational requirements regarding draft protection versus turbulence minimization.
Solution Approach 2:
The invention changes the volume parameter of the weighing chamber by moving the top wall along the rear wall. This parameter adjustment allows optimization of the balance between draft protection and turbulence reduction, enabling the system to achieve both contradictory requirements at different operational states.
2Device complexity
If the top cover is fixed to the dosage dispensing housing, then the structure is simplified, but the range of height adjustment of the weighing chamber is limited
Solution Approach 1:
The top wall is separated from the dosage dispensing housing, creating independent movable and fixed components. The top wall can move along the rear wall while the housing remains stationary, allowing the weighing chamber height to be adjusted independently of the dispensing device position, thus increasing adaptability without excessive complexity.
3Stability of the object's composition
If the mounting unit is fixed to the top wall, then the structure is more stable, but the accessibility of accessories for maintenance is reduced
Solution Approach 1:
The mounting unit is made movable relative to the top wall through the position control mechanism. This dynamic arrangement allows the mounting unit to be positioned in different locations along the rear wall, including extended positions that provide easy access for maintenance, while maintaining stable connection during weighing operations.
4Ease of operation
If the door of the draft shield is opened, then access to the weighing chamber is improved, but temporary turbulence negatively affects weighing accuracy
Solution Approach 1:
The movable top wall provides an alternative dynamic access mechanism to the weighing chamber that does not require opening the door. By extending the top wall, operators can access the chamber from the top, avoiding the turbulence caused by door opening while maintaining ease of operation for certain tasks.
Data Source
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AI summary
A weighing balance comprising a base body, a weighing chamber rear wall, and a top wall; the weighing chamber rear wall comprising a first side and a second side with the first side facing the draft shield and the second side located opposing the first side; the weighing balance further comprising a mounting unit movably connected to the first side of the weighing chamber rear wall and positioned above the top wall, the weighing chamber rear wall further comprising an elongate slot extending from the first side through the second side and receiving the mounting unit and the top wall about the first side and guiding the mounting unit and the top wall in a direction normal to the base body. Whereby a position control unit located on the second side and comprising a lower carriage operatively connected to the top wall, an upper carriage operatively connected to the mounting unit such that the mounting unit and the top wall are movable together along the elongate slot wherein the lower carriage is stoppable by a stopper at a predetermined position away from the base body while allowing the upper carriage to advance beyond said stopper thereby separating the mounting unit spatially from the top wall.