Cranked Scraper Floor Reduces Tractive Force in Crop Loading Wagons
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Solution Overview
Problem
Current self-loading wagons face challenges with increased loading capacity, energy consumption, and accident risks due to high tractive forces and jamming issues caused by large wheel diameters and inclined scraper floors, which compromise tire size and loading volume.
Innovation Solution
A chain conveyor system with multiple bends in the cranked area reduces reaction forces, allowing larger wheel diameters and an adjustable feed column for improved crop handling and reduced energy consumption, along with a control device for optimizing feed conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If larger wheel diameters are used to minimize ground contact pressure and rolling resistance, then energy consumption is reduced and soil protection is improved, but the distance between the loading wagon floor and the ground increases, requiring a greater scraper floor incline angle that increases tractive force requirements
Solution Approach 1:
The scraper floor is divided into multiple sections with different incline angles. The first section has a steeper incline for effective crop gathering, while the second section has a reduced incline angle that decreases tractive force requirements. This segmentation allows the system to benefit from large wheel diameters (reducing rolling resistance) while maintaining effective crop collection without excessive tractive force demands.
2Productivity
If the scraper floor incline angle is increased to improve crop collection efficiency, then loading capacity is improved, but tractive force requirements increase drastically leading to jamming and accumulation problems
Solution Approach 1:
The scraper floor is divided into multiple sections with different incline angles. The first section has a steeper incline for effective crop gathering, while the second section has a reduced incline angle that decreases tractive force requirements. This segmentation allows the system to benefit from large wheel diameters (reducing rolling resistance) while maintaining effective crop collection without excessive tractive force demands.
Solution Approach 2:
The scraper floor includes a curved transition area between the first and second sections. This curved transition smoothly connects the steeper first section to the gentler second section, allowing for gradual angle changes that reduce abrupt force variations and minimize the risk of crop jamming while maintaining loading efficiency.
3Volume of moving object
If the scraper floor is cranked at a high incline angle to maximize loading volume, then more crop can be collected, but the feed column becomes difficult to move during unloading and jamming risks increase
Solution Approach 1:
The scraper floor is divided into multiple sections with different incline angles. The first section has a steeper incline for effective crop gathering, while the second section has a reduced incline angle that decreases tractive force requirements. This segmentation allows the system to benefit from large wheel diameters (reducing rolling resistance) while maintaining effective crop collection without excessive tractive force demands.
Solution Approach 2:
The scraper floor system allows for dynamic adjustment of the feed column position. The feed column can be moved to different positions along the scraper floor, including areas with reduced incline angles, making it easier to access and maneuver during unloading operations while maintaining optimal loading volume capabilities.
4Productivity
If the scraper floor incline is steep to overcome the height difference between ground and loading floor, then loading capacity is improved, but high peaks in tractive force occur leading to disruptions and safety risks
Solution Approach 1:
The scraper floor is divided into multiple sections with different incline angles. The first section has a steeper incline for effective crop gathering, while the second section has a reduced incline angle that decreases tractive force requirements. This segmentation allows the system to benefit from large wheel diameters (reducing rolling resistance) while maintaining effective crop collection without excessive tractive force demands.
Solution Approach 2:
The scraper floor includes a curved transition area between the first and second sections. This curved transition smoothly connects the steeper first section to the gentler second section, allowing for gradual angle changes that reduce abrupt force variations and minimize the risk of crop jamming while maintaining loading efficiency.
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 design reduces energy consumption, minimizes jamming, and enhances loading capacity while reducing accident risks and environmental impact by enabling larger wheel diameters and better crop handling.
Implementation Method 1
the chain conveyor (15) is bent at least several times in the cranked area (27) of the conveyor floor (19), or at least a double cranking and bending in the transition area from the inclined plane (22) to the predominantly horizontal plane (21), the reaction forces or the tensile forces in the traction mechanism (14) of the conveyor floor (19) are significantly reduced
Implementation Method 2
It is desirable to equip these axles with running wheels with a larger diameter in order to minimize the ground contact pressure and thus the sinking depth into the ground as much as possible
Implementation Method 3
the harvested crop after it has been transferred by the pick-up to the cutting device also has to overcome a greater lifting height, which is accomplished by the fact that the floor of the loading wagon and thus also the scraper floor is initially an inclined plane which merges into an approximately horizontal plane
Implementation Method 4
the harvested crop is also conveyed vertically upwards above the conveying rotor and finally, as the conveying progresses, reaches the so-called roof plate as an upright feeding column and is thus subjected to vertical compression
Data Source
Figure 1
Figure 2
Figure 2a
AI summary
The loading vehicle (1) has a pick up collecting device and a revolving rotary conveyor rotor mounted upstream. Another offset upstream mounted scraper floor has a revolving link chain. One section is formed as a horizontal part and other section is formed as a sloping part of a scraper floor. The scraper floor has other section as a crank part with two kinks.