Sensor Mechanism Body for Electronic Balance Shift Error Cancellation
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Solution Overview
Problem
In electronic balances with a sub-Roberval mechanism for internal weight correction, shift errors cannot be cancelled out when the load is applied to the weighing plate in the direction of the width, causing a large twisting torque due to the twisting path from the sub-Roberval mechanism.
Innovation Solution
The sensor mechanism body incorporates a thin-walled connection section with cuts at opposite ends in the direction of thickness between the second fixed column and the second lever, allowing the path from the sub-Roberval mechanism to twist similarly to the first lever, maintaining the position of the second lever under twisting torque and cancelling out shift errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sub-Roberval mechanism is added for internal weight correction, then correction function is improved, but shift error cancellation deteriorates due to twisting torque
Solution Approach 1:
The patent applies this principle by introducing a thin-walled connection section with cuts at opposite ends in the thickness direction. This thin-walled structure allows controlled twisting deformation to match the twisting torque from the sub-Roberval mechanism, enabling the second lever to maintain its position and cancel shift errors while preserving the correction function
Solution Approach 2:
The patent changes the structural parameters of the connection section between the second fixed column and second lever by creating cuts at opposite ends in the thickness direction. This parameter change transforms the rigid connection into a flexible one that can twist, allowing the system to accommodate the twisting torque from the sub-Roberval mechanism while maintaining measurement precision
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 configuration ensures that the shift error caused by twisting torque from the sub-Roberval mechanism is cancelled out, maintaining the position of the second lever, thereby improving the accuracy of load measurement.
Implementation Method 1
a thin-walled connection section with cuts at opposite ends in the direction of thickness between the second fixed column and the second lever
Implementation Method 2
a main Roberval mechanism provided with a first fixed column fixed to an electronic balance base, a first movable column for transmitting the load of an object to be measured placed on a weighing plate
Implementation Method 3
the sensor mechanism bodies transmit the displacement of the movable column in the Roberval mechanism to the electromagnetic force generating device with a large lever ratio
Implementation Method 4
an electromagnetic force generating device generates electromagnetic force which resists the displacement of the movable member in the sensor mechanism body
Data Source
Figure 1
Figure 2(a)~2(c)
Figure 3
AI summary
A sensor mechanism body (1) is provided with: a main Roberval mechanism (R1); a sub-Roberval mechanism (R2) provided with a second fixed column (10) fixed to or integrated with an electronic balance base, a second movable column (21) to which the load of an internal weight (4) placed on an engaging section (5) is transmitted, and two second beams (22, 23) arranged parallel to each other and connecting the second movable column (21) to the second fixed column (10); a first lever (31) rockably supported by a first fulcrum (31a), having one end to which a first movable column (11) of the main Roberval mechanism (R1) is connected, and having the other end to which a second lever (32) is connected; and the second lever (32) rockably supported by a second fulcrum (32a), having one end to which a second movable column (21) of the sub-Roberval mechanism (R2) is connected, and having the other end to which an electromagnetic force generating device (3) and the other end of the first lever (31) are connected. The second fixed column (10) of the sub-Roberval mechanism (R2) is connected to the second lever (32) through a thin-walled connecting section having cuts created in opposite ends in the direction of the thickness thereof.