Baler Start-Up Control System for Flywheel Torque Management
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Solution Overview
Problem
Towable square balers with heavy flywheels face start-up issues due to high torque requirements, leading to tractor engine stalling or safety mechanisms disengaging, as the PTO shaft may not provide sufficient power to bring the flywheel up to speed, especially when starting with residual crop material in the bale chamber.
Innovation Solution
A start-up control system with an auxiliary motor and sensors that rotate the flywheel to a predetermined launch position before starting, allowing it to gain kinetic energy and ensuring successful start-up, reducing wear and the risk of stalling, and enabling the use of less powerful tractors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a large flywheel is used to overcome peak loads in the baler gearbox, then the baler can handle high compression forces, but the PTO shaft cannot provide sufficient torque to bring the flywheel up to speed during start-up, causing engine stalling or safety mechanism disengagement
Solution Approach 1:
The system performs preliminary action by rotating the flywheel in reverse direction using an auxiliary motor before normal operation begins. This positions the crank at a predetermined launch position where the flywheel will have optimal kinetic energy to overcome the first compression peak, resolving the start-up torque deficiency without requiring a larger flywheel that would worsen the start-up problem
Solution Approach 2:
The invention applies reverse rotation of the flywheel during start-up preparation instead of direct forward rotation. By rotating the flywheel backwards to a specific position and then engaging forward rotation, the system exploits the mechanical advantage of the crank-position-dependent compression cycle, allowing the flywheel to gain speed before encountering the first high-torque demand
2Productivity
If the PTO shaft is driven at normal operating speed to drive the baler, then the baler operates efficiently during normal operation, but the PTO shaft cannot provide the high torque needed to accelerate the heavy flywheel during start-up
Solution Approach 1:
Before normal operation begins, the auxiliary motor performs preliminary rotation of the flywheel to a predetermined position. This preliminary action ensures the flywheel starts from an optimal position where the first compression stroke will not cause stalling, thereby improving start-up reliability without affecting normal operation efficiency
Solution Approach 2:
The auxiliary motor acts as an intermediary device that performs the difficult start-up function separately from the main PTO shaft. This intermediary system prepares the flywheel in reverse, allowing the PTO shaft to then accelerate the flywheel without being burdened by the high torque requirements, ensuring both reliable start-up and efficient normal operation
3Power
If a hydraulic motor is used to supplement torque during start-up, then the flywheel can be accelerated to operating speed, but a powerful hydraulic motor with power comparable to the tractor PTO is required
Solution Approach 1:
Instead of using a powerful hydraulic motor to push the flywheel forward in the traditional direction, the invention uses a less powerful auxiliary motor to rotate the flywheel backwards to a specific position. This inverted approach reduces the power requirement significantly while still achieving reliable start-up
Solution Approach 2:
The invention changes the operational parameters by using reverse rotation and a predetermined launch position rather than direct forward acceleration. This parameter change allows a smaller auxiliary motor to achieve the same start-up effect that would otherwise require a much more powerful hydraulic system, reducing both power requirements and system complexity
4Ease of operation
If the flywheel is started from any random position, then the system is simple to operate, but the first plunger impact may cause the flywheel to stall and the start-up to fail
Solution Approach 1:
The auxiliary motor automatically positions the flywheel at the predetermined launch position without requiring manual intervention or complex operator judgment. This self-positioning capability maintains ease of operation while ensuring reliable start-up by consistently achieving the optimal launch position
Solution Approach 2:
The control system uses sensors to detect the crank position and provides feedback to the auxiliary motor to precisely position the flywheel at the predetermined launch position. This feedback mechanism ensures accurate positioning for reliable start-up while maintaining operational simplicity through automation
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 system significantly reduces start-up failures, minimizes wear on the tractor and baler, and increases efficiency by ensuring consistent start-up without the need for repeated attempts, allowing smaller tractors to operate the baler effectively.
Implementation Method 1
an auxiliary motor connectable to the flywheel for starting up rotation thereof
Implementation Method 2
a flywheel connected to the shaft and adapted for rotating in a forward direction... the flywheel can gain more kinetic energy than is required for compressing the crop material
Implementation Method 3
a plunger connected to the flywheel via a crank, the plunger being adapted for performing a reciprocal movement
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A baler (70) comprises a flywheel (2), a plunger (4) connected to the flywheel (2) via a crank (6), an auxiliary motor (5) for rotating the flywheel (2) in a reverse direction (R) and a start-up control system (1) comprising a sensor (11) for providing a signal indicative for the position of the crank (6) and a control unit (12) for controlling the auxiliary motor (5) for rotating the flywheel (2) in reverse direction (R) to a predetermined launch position for enabling the flywheel (2) to gain sufficient kinetic energy before the first plunger impact, at the next start-up.