Load Beam Stiffening for Bending Resistance
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Solution Overview
Problem
Weighing apparatuses in agricultural balers face challenges in withstanding large bending moments due to the heavy weight and uneven center of gravity of bales, which can cause damage to securing bolts and result in measurement errors.
Innovation Solution
A weighing apparatus design featuring a load beam secured by a stiffening member with a pressure distribution plate and a cylindrical sleeve, which distributes the pressure symmetrically and prevents transverse movement of the stiffening member, enhancing the resistance to bending and ensuring accurate force transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional load beam with a single securing bolt is used to mount the weighing table, then the device complexity is low, but the securing bolt is damaged due to large bending moments caused by heavy bales with uneven center of gravity
Solution Approach 1:
The stiffening member is divided into multiple parts (first part above the load beam, second part below the load beam) that work together to resist bending moments. This segmentation allows each part to contribute to the overall structural strength without requiring a single complex component
Solution Approach 2:
The connection assembly combines multiple materials and components: the stiffening member (metal), pressure distribution plate (metal), cylindrical sleeve (metal), and securing bolt (metal). This composite structure provides enhanced bending resistance compared to a single material solution
2Reliability
If the pressure distribution plate is compressed by the securing bolt between the stiffening member and load beam, then the force distribution is improved, but the device complexity increases
Solution Approach 1:
The pressure distribution plate acts as an intermediary element between the securing bolt assembly and the load beam. It distributes the compressive force evenly across the load beam surface, preventing localized stress concentrations and improving force transmission reliability
Solution Approach 2:
The stiffening member parts, pressure distribution plate, cylindrical sleeve, and securing bolt are combined into a single integrated assembly that performs multiple functions: structural stiffening, force distribution, and positional constraint
3Measurement precision
If the cylindrical sleeve is used to prevent transverse movement of the stiffening member, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The cylindrical sleeve provides localized constraint specifically in the transverse direction, while allowing movement in the axial direction (parallel to bolt axis). This selective constraint ensures accurate force transmission without over-constraining the system
Data Source
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AI summary
A weighing apparatus comprises a weighing table (16) secured to a support frame (18) by way of a load beam (10), the load beam (10) being an elongate member having a through hole receiving a securing bolt (20) fixed to the weighing table (16). In the invention, the securing bolt (20) passes through a bracket (30, 130) having two limbs (30a, 130a and 30b, 130b) disposed above and below the load beam (10), respectively. A pressure distribution plate (32) is compressed by the securing bolt (20) between one limb (30a, 130a) of the bracket (30, 130) and one side of the load beam (10). On the other side of the load beam (10), a cylindrical sleeve (38) encircling the securing bolt (20) passes through a hole in the other limb (30b,130b) of the bracket (30, 130) to prevent movement of the bracket (30, 130) transverse to the axis of the securing bolt (20).