Trailer Spreader Relief Element Length for Drawbar Load Control
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Solution Overview
Problem
The existing towed distribution machines face a challenge where the relief element extending over the entire length of the reservoir leads to increased vertical load on the drawbar, potentially exceeding permissible values due to uneven material removal, with the rear area being emptied first, causing an imbalance.
Innovation Solution
The relief element is designed to extend only over ¾ or half the length of the storage container towards the drawbar, ensuring initial material removal from the front area, with through-openings in the roof surfaces and adjustable cover elements to manage material flow from both areas, preventing negative vertical loads on the drawbar.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the relief element extends over the entire length of the storage container, then the material is relieved from the conveyor belt, but the vertical load on the drawbar increases excessively
Solution Approach 1:
The relief element is segmented in length, extending only over the rear two-thirds of the storage container instead of the entire length. This segmentation allows material relief in the rear area while preserving front area material to maintain drawbar load within permissible limits.
Solution Approach 2:
Different regions of the storage container are treated differently: the rear area has relief element coverage for improved material conveyance, while the front area remains uncovered to maintain necessary vertical load on the drawbar. This local differentiation resolves the contradiction between material flow and load management.
2Productivity
If the relief element extends over the entire length of the storage container, then material conveyance is improved, but the rear area is emptied first causing load imbalance
Solution Approach 1:
The relief element coverage is segmented to exclude the front third of the storage container. This ensures that material is discharged from the rear area first (improving productivity) while the front area material remains to maintain stable load distribution on the drawbar.
Solution Approach 2:
The relief element is positioned to act on the rear area first, creating a preliminary discharge zone that prevents front-area material from being removed initially. This preliminary action sequence maintains load stability while enabling efficient rear-area discharge.
3Force
If the relief element is shortened to reduce drawbar load, then vertical load is reduced, but material removal from the front area is insufficient
Solution Approach 1:
The relief element is strategically positioned to cover the rear two-thirds of the storage container where material removal is most needed for productivity, while intentionally leaving the front third uncovered to maintain drawbar load. This local quality differentiation optimizes both load management and material discharge efficiency.
Data Source
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AI summary
A trailed spreading machine, in particular a fertilizer spreader, especially for spreading granular material, comprising a frame (1), a preferably single-axle chassis (2) or tandem chassis, a drawbar (5) and a hopper (6) mounted on the frame, and comprising at least one spreading element (12) for distributing the material, which is arranged on the end (20) of the hopper opposite the drawbar, and a driven conveyor belt (11) for conveying the material to the spreading element arranged on the end of the hopper opposite the drawbar, wherein the hopper is designed as an elongated container and the conveyor belt, guided over deflection rollers (13) and extending over the entire lower width of the hopper, is arranged in the lower region of the hopper.In the lower part of the storage container, above the conveyor belt, a roof-shaped relief element (19) is arranged, dividing the conveyor belt into two conveying areas spaced apart from each other and extending over at least a portion of the length of the storage container and the conveyor belt. To ensure that the material to be dispensed is initially drawn primarily from the front part of the storage container, facing the drawbar, via the conveyor belt, the relief element extends from the end of the storage container furthest from the drawbar towards the drawbar over no more than ¾ of its length, preferably no more than half the length of the storage container or conveyor belt.