Combine Threshing Top Plate Arc Shape and Adjustable Dust Valve
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Solution Overview
Problem
Existing combines face difficulties in moving threshing targets through the threshing chamber at appropriate speeds due to strong flow resistance from the top plate, leading to inefficient threshing processing, especially when dealing with varying crop qualities and high reaping speeds.
Innovation Solution
The design incorporates a threshing device with a top plate featuring an arc-shaped portion facing the second dust-sending member and a first dust-sending member with a changeable sending angle, supported by a swingable shaft, allowing for optimal guiding and sending of crops without excessive flow resistance, and includes a notch and gap configuration to prevent clogging and ensure smooth movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a flat top plate is used in the threshing chamber, then the structure is simple and easy to manufacture, but the threshing target receives strong flow resistance and cannot move through the chamber at appropriate speed
Solution Approach 1:
The top plate is designed with an arc-shaped portion instead of a flat surface. This curved geometry reduces flow resistance against the threshing target, allowing it to move more smoothly through the threshing chamber at appropriate speeds, thereby improving threshing processing efficiency while maintaining manufacturing feasibility.
2Device complexity
If the sending angle of the first dust-sending member is fixed, then the device complexity is reduced, but the threshing target cannot be guided efficiently for different crop qualities
Solution Approach 1:
The first dust-sending member is designed with a changeable sending angle through a swingable structure supported by a shaft. This dynamic adjustment capability allows the threshing target to be efficiently guided and sent toward the rear of the threshing chamber for different crop qualities, improving adaptability while maintaining reasonable device complexity.
3Productivity
If a large amount of reaped crops is supplied to the threshing chamber, then the reaping speed can be increased, but the movement speed of the threshing target becomes inappropriate and clogging occurs
Solution Approach 1:
The arc-shaped portion of the top plate reduces flow resistance and prevents clogging by allowing the threshing target to move more smoothly through the chamber, enabling higher reaping speeds without compromising flow smoothness or causing blockages even when large amounts of crops are supplied.
Solution Approach 2:
The changeable sending angle of the first dust-sending member allows optimization of crop flow dynamics in the threshing chamber, ensuring appropriate movement speeds for the threshing target even when large volumes of crops are processed, thereby maintaining reliability at high productivity levels.
Data Source
AI summary
In a combine, each of a plurality of dust-sending valves 30B includes a first dust-sending member 31 provided in an upper portion of a threshing chamber 16 in a state of extending in a left-right direction of a threshing chamber and in a state in which a sending angle is changeable by swinging, and a second dust-sending member 32 provided in a state of being fixed to a position located on an upstream side in a rotation direction of a threshing cylinder with respect to the first dust-sending member 31 such that a sending angle is not changeable. A portion of a top plate 19 facing the second dust-sending member 32 has an arc shape as viewed in a direction along a rotation axis P of a threshing cylinder 20.