Hopper Bottom Auger Chute and Ventilation Design
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Solution Overview
Problem
Existing grain bin hopper bottoms with conical designs often suffer from grain spillage and cumbersome cleaning due to ventilation systems that impede grain flow and trap material, making unloading and cleaning inefficient.
Innovation Solution
A hopper bottom design featuring an inverted cone inner wall with auger chute walls extending to the floor, a slide member for redirecting material, and a ventilation system with flush perforated screens to prevent grain flow obstruction, along with a common manifold for efficient ventilation air distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conical hopper bottom is used to assist grain flow to center discharge, then unloading efficiency is improved, but grain spillage onto ground increases requiring cleanup effort
Solution Approach 1:
An auger chute is introduced as an intermediary component between the conical hopper bottom and the ground. The chute captures grain flowing from the hopper center discharge and directs it into the auger inlet, preventing spillage onto the ground while maintaining the efficiency benefits of the conical design.
2Loss of substance
If a separate hopper boot is mounted about the auger inlet to direct material, then grain spillage is reduced, but the system becomes cumbersome and awkward to manipulate
Solution Approach 1:
The hopper boot is merged with the hopper bottom to form an integrated structure. The auger chute is built as an integral part of the hopper bottom assembly rather than a separate component, eliminating the need for separate attachment and manipulation of the boot while maintaining grain capture functionality.
3Use of energy by moving object
If ventilation channels protrude into the cone portion to provide grain drying, then ventilation is improved, but grain flow is impeded and cleanout becomes difficult
Solution Approach 1:
The ventilation channels are designed with different characteristics in different regions. The channels are positioned and sized to provide adequate ventilation in the upper portions of the hopper where grain depth is greatest, while minimizing protrusion in lower regions to maintain smooth grain flow and facilitate cleanout.
Data Source
AI summary
A hopper bottom for a cylindrical grain bin includes a floor structure, an outer cylindrical wall extending up from the floor and upon which the bin is supported, and an inner wall having an inverted cone shape which tapers downwardly and inwardly to join the floor structure about a central area. A pair of spaced apart upright auger chute walls extend radially outward from the central area to an access opening in the outer wall to receive an auger for unloading. Screens are flush mounted in the inner wall such that ventilation air directed into a manifold space between the inner and outer walls is forced up through the screens into the grain bin. The floor structure includes a floor sheet, a perimeter member about the outer wall, and radial supports extending between the central area and the perimeter members.