Laboratory Balance Motor Drive Nesting in Rear Wall
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Solution Overview
Problem
Existing laboratory balances lack an optimized motor drive mechanism for actuating the sliding movements of the top wall of the draft shield, which affects manufacturing and servicing logistics and efficiency.
Innovation Solution
A modular design for the motor drive unit is integrated within the weighing chamber rear wall, utilizing a compartmentalized structure to house the drive unit, reducing the number of moving parts and enhancing space utilization, with a transmission unit including a motor, control circuit, and mechanical components to efficiently operate the top wall panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the motor drive unit is arranged outside the weighing chamber, then it is easier to access for servicing, but it increases exposure to dust and chemicals and reduces compactness
Solution Approach 1:
The motor drive unit is nested within a compartment formed by the weighing chamber rear wall. The compartment includes a cavity that houses the motor drive unit, effectively placing the motor inside the weighing chamber structure. This nesting approach protects the motor from external dust and chemicals while maintaining a compact overall design.
Solution Approach 2:
A removable panel or access door is introduced as an intermediary element in the rear wall. This panel provides a controlled access path to the motor drive unit, allowing servicing without fully exposing the motor to the external environment. The panel acts as a mediator between the need for accessibility and the need for protection.
2Volume of stationary object
If the motor drive unit is integrated within the weighing chamber rear wall, then compactness and protection are improved, but accessibility for servicing deteriorates
Solution Approach 1:
The rear wall is segmented into multiple parts, including a removable panel or access door that can be separated from the main structure. This segmentation allows the motor drive unit to remain integrated within the compact rear wall assembly while providing a separate access path for servicing. The segmented design maintains compactness while enabling maintenance.
Solution Approach 2:
The rear wall or access panel is designed to be dynamically removable or openable during servicing operations. This dynamic characteristic allows the system to transition between a compact protected state during operation and an accessible state during maintenance, resolving the contradiction between compactness and serviceability.
3Ease of operation
If a traditional separate housing is used for the motor drive unit, then accessibility is improved, but the number of moving parts and complexity increases
Solution Approach 1:
The motor drive unit is merged with the weighing chamber rear wall structure, eliminating the need for a separate external housing. The rear wall itself forms the housing for the motor, reducing the number of distinct components. This merging maintains accessibility through the rear wall design while significantly reducing overall device complexity.
Solution Approach 2:
The rear wall serves multiple functions: it encloses the weighing chamber, provides structural support, and houses the motor drive unit. This multi-functionality eliminates the need for separate dedicated housings for each function, reducing the total number of parts while maintaining all necessary operational capabilities.
Data Source
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AI summary
A laboratory balance (1) of the type to which this invention relates has a base body (2), a weighing chamber (10) with a weighing chamber floor (3) and a weighing chamber rear wall (4), a draft shield (5,5',5") with a top wall (6), a first side wall (7), a second side wall (8) arranged parallel to the first side wall (7), and a front wall (9). The weighing chamber floor (3), the draft shield (5,5',5") and the weighing chamber rear wall (4) together enclose the weighing chamber (10). A drive unit (19) is operatively connected to the top wall (6) and serves to actuate opening and closing movements of the top wall (6). According to the invention, at least a portion of the weighing chamber rear wall (4) is configured as a compartment, and the drive unit (19) is arranged in said compartment-shaped portion of the weighing chamber rear wall (4).