Hydraulic Circuit Layout for Independent Colter Pressure and Blower Speed
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Solution Overview
Problem
Agricultural spreading machines face challenges in maintaining sufficient colter pressure at low blower rotational speeds, leading to impaired germination and plant growth due to insufficient hydraulic pressure in the common line region.
Innovation Solution
A hydraulic circuit utilizing a 3-way flow control valve ensures consistent hydraulic pressure at the colter pressure adjustment cylinder, independent of blower pressure, allowing for desired colter pressure adjustments and separate blower rotational speed control through a hydraulic control block and method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a 2-way flow regulator is used in the common line region, then the blower rotational speed can be adjusted, but the colter pressure becomes dependent on the blower hydraulic pressure
Solution Approach 1:
The hydraulic circuit is segmented into two independent branches: a first line region supplying the colter pressure adjustment cylinder with a 3-way flow control valve, and a second line region supplying the blower drive with a 2-way flow regulator. This segmentation allows independent control of colter pressure and blower speed without mutual interference.
Solution Approach 2:
A priority outlet is introduced as an intermediary element in the hydraulic circuit. This priority outlet ensures that the colter pressure adjustment cylinder receives prioritized hydraulic flow with sufficient pressure, while the blower receives remaining flow. The priority outlet acts as a mediator that resolves the conflict between the two competing hydraulic demands.
2Stress or pressure
If hydraulic pressure is increased in the common line region, then colter pressure can be maintained at high blower speeds, but insufficient pressure remains at low blower speeds
Solution Approach 1:
Different hydraulic pressure characteristics are provided at different locations in the system. The first line region (colter pressure) receives high pressure through the priority outlet with volume flow limitation, while the second line region (blower drive) receives variable pressure depending on operational demands. This local differentiation resolves the pressure-speed conflict.
Solution Approach 2:
The system changes the hydraulic parameters (pressure and flow distribution) based on operational conditions. The 3-way flow control valve with priority outlet dynamically adjusts the volume flow distribution between the two line regions, ensuring the colter pressure adjustment cylinder always receives sufficient pressure regardless of blower speed settings.
3Device complexity
If a common line region is used for both blower and colter pressure, then device complexity is reduced, but control independence is lost
Solution Approach 1:
The hydraulic valve is designed with multi-functionality, serving as both a flow regulator for the blower and a priority outlet for the colter pressure system. The single hydraulic valve performs multiple functions: regulating blower speed through the second line region while simultaneously ensuring prioritized pressure supply to the colter pressure adjustment cylinder through the first line region. This universal design achieves control independence without proportionally increasing device complexity.
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
Enables independent adjustment of colter pressure and blower speed, ensuring optimal sowing depths and plant growth by maintaining required hydraulic pressures at the colter pressure adjustment cylinder even at low blower rotational speeds.
Implementation Method 1
a hydraulic valve (14) which adjusts a hydraulic pressure in the first line region (22) and in the second line region (28), in particular by way of a 3-way flow control valve
Implementation Method 2
The valve inlet (16) is connected to a priority outlet (18), via which a volume flow is limited to a valve-specific volume flow
Data Source
AI summary
The invention relates to a hydraulic circuit for colter pressure and blower rotational speed adjustment at an agricultural spreading machine, with a first line region, which is configured to be connected to at least one colter pressure adjustment cylinder and to specify a hydraulic pressure to the colter pressure adjustment cylinder, a second line region which is configured to be connected to a hydraulically drivable blower and to specify a hydraulic pressure to the blower, and a hydraulic valve for adjusting the hydraulic pressure in the first line region and the hydraulic pressure in the second line region.