Two-Way Pull Wire Threshing Device for Adjustable Clearance
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Solution Overview
Problem
Existing threshing devices in combined harvesters face issues with complex adjustment mechanisms, inconsistent threshing clearance, and labor-intensive processes, leading to clogging and reduced efficiency due to fluctuating feed amounts and varying field conditions.
Innovation Solution
A threshing device with two-way pull wires and adjustable threshing clearance, utilizing tangential and radial tensioning mechanisms with elastic gaskets and guide devices to simplify and automate the adjustment of grid bar positions, ensuring uniform and adaptive threshing clearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional concave clearance adjustment methods are used (shutting down and replacing concave plate), then threshing drum clogging is prevented, but operating efficiency and time consumption are reduced
Solution Approach 1:
The patent applies dynamics by making the concave plate adjustable during operation rather than fixed. The concave plate can be dynamically repositioned along the drum axis to change clearance, allowing the system to adapt to varying feed conditions without shutdown, thus maintaining both reliability and productivity
Solution Approach 2:
The patent changes the clearance parameter dynamically by moving the concave plate to different positions along the drum axis. This parameter adjustment allows the system to respond to changing operating conditions (feed amount, crop type) in real-time, preventing clogging while maintaining continuous operation and high productivity
2Extent of automation
If one side of the concave plate is rotated to adjust clearance, then automatic adjustment is achieved, but inconsistent concave clearance and under-threshing or clogging occur
Solution Approach 1:
The patent segments the adjustment mechanism by providing separate adjustment capabilities for different regions of the concave plate (front, rear, left, right sides). Each side can be independently adjusted to achieve uniform clearance across the entire drum surface, solving the inconsistency problem while maintaining automation
Solution Approach 2:
The patent uses asymmetric adjustment mechanisms where different sides of the concave plate can be adjusted by different amounts. This allows compensation for wear patterns and loading conditions, achieving uniform clearance distribution across the drum surface through non-uniform adjustment of individual sides
3Ease of operation
If multiple hydraulic oil cylinders are used for integral adjustment of concave plate, then threshing clearance can be adjusted, but mechanism complexity and energy consumption increase
Solution Approach 1:
The patent merges multiple adjustment functions into a single integrated mechanism. The concave plate is designed with guide grooves and positioning structures that allow one-sided or localized adjustment to achieve uniform clearance across all sides, eliminating the need for multiple independent hydraulic cylinders and reducing mechanism complexity
Solution Approach 2:
The patent extracts the adjustment function from a complex multi-cylinder system and implements it through a simpler mechanism using guide grooves, positioning pins, and single-point actuation. This extraction simplifies the overall system while maintaining the ability to adjust clearance effectively
4Ease of operation
If great force is applied to move the entire concave plate, then threshing clearance is adjusted, but energy consumption increases
Solution Approach 1:
The patent segments the concave plate movement into localized adjustments rather than moving the entire plate. By allowing individual sections or sides to be adjusted independently through guide grooves and positioning mechanisms, less force and energy are required compared to moving the complete assembly
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
The solution effectively prevents drum clogging, stabilizes the threshing process, and ensures uniform threshing clearance, enhancing the operational efficiency and reliability of combined harvesters by allowing quick and convenient adjustment of grid bar positions.
Implementation Method 1
several elastic gaskets arranged in the radial and tangential directions of the grid bars and connected to the radial pull wires or tangential pull wires
Data Source
AI summary
A threshing device with two-way pull wires and adjustable threshing clearance includes a tensioning mechanism, and several grid bars in clearance fit with side plates, wherein the tensioning mechanism is mounted on the several grid bars so that the grid bars can move in radial and tangential directions in the clearance; the tensioning mechanism includes a tangential tensioning device and a radial tensioning device, wherein the radial tensioning device is mounted in the radial direction of any one of the grid bars, so that the grid bars can move in the radial direction in the clearance; the tangential tensioning device is mounted in series in the tangential direction of the grid bars, so that the grid bars can move in the tangential direction in the clearance. Further disclosed is a combined harvester, which includes the threshing device with two-way pull wires and adjustable threshing clearance.