Double Disc Plough Depth Guide Roller Kinematic Guidance
Solution Overview
Problem
Existing double disc coulters with depth control rollers for seed drills face issues with precise depth control on uneven terrain and excessive force accumulation when hitting obstacles, leading to potential damage and inefficiency.
Innovation Solution
A compact design featuring a separate swivel arm for the depth control roller with a kinematic parallelogram guidance and a flexible connecting link, such as a chain or cable, that allows the double disc coulter to deviate without lifting the depth control roller, combined with maintenance-free rubber bearings for reduced maintenance and improved stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the depth control roller is spring-loaded connected to the double disc coulter, then high component loads are avoided when hitting obstacles, but precise depth control on uneven terrain is lost
Solution Approach 1:
The system is divided into two independent but coordinated segments: the depth control roller with its own swivel arm and the double disc coulter with its support arm. Each segment can move independently through its swivel range, allowing the depth control roller to maintain precise depth positioning while the coulter handles obstacle impacts separately.
Solution Approach 2:
The connecting link acts as an intermediary element between the depth control roller and the double disc coulter. It transmits the necessary mechanical connection while allowing independent movement of both components, enabling precise depth control to be maintained while still providing load relief during obstacle impacts.
2Measurement precision
If the depth control roller is rigidly connected to the double disc coulter, then precise depth control is maintained, but high acceleration forces occur when hitting obstacles
Solution Approach 1:
The connection between the depth control roller and double disc coulter is made dynamic through the swivel arms and connecting link. The swivel arms allow controlled movement and rotation, transforming the rigid connection into a flexible one that can adapt to obstacle impacts while maintaining depth control precision during normal operation.
3Adaptability or versatility
If sufficient free space is provided behind swivel arms for obstacle clearance, then obstacle handling is improved, but device compactness is reduced
Solution Approach 1:
The swivel arms are positioned and oriented in specific spatial dimensions to achieve obstacle clearance without requiring excessive longitudinal space. By utilizing vertical and lateral dimensions for the swivel motion, the design maintains compactness in the forward-direction while still providing adequate clearance for obstacle handling.
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
Ensures precise depth control and minimizes damage by allowing the double disc coulter to navigate obstacles without displacing the depth control roller, maintaining consistent sowing depth and reducing maintenance efforts, while maintaining a compact and efficient seed drill design.
Implementation Method 1
The connecting link has damping elements for absorbing large tensile forces. If the double disc coulter rolls over an obstacle with high coulter pressure and high working speed and then swings back again, the connecting link has to absorb greater tensile forces
Implementation Method 2
maintenance-free joints with a rubber bearing
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The device has a pivot arm mounted about an axis transverse to the working direction (4) and at a distance from and in front of the pivot axis of the dual disk plow (1) so as to be pivotable in the horizontal direction. It has a connecting linkage between the pivot arm of the roller and supporting arm (6) of the plow that is flexible in the pressure direction that ensures parallel guidance of the plow by the depth guidance roller.