Press Drive Eccentric Oscillation for Variable Ram Force
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Solution Overview
Problem
Existing press drives with knee lever gears face challenges in maintaining simplicity while allowing for different operating modes, as they often require complex adjustments and additional components to change the connecting rod length, which complicates the design and increases the mass of the connecting rod, leading to undesirable changes in the ram's movement.
Innovation Solution
A press drive design featuring a knee lever gear with a hinged joint and an eccentric drive that operates in multiple modes without additional adjustment means, utilizing a control unit to select suitable operating modes based on detected parameters, allowing for different press forces and velocities without changing the eccentricity, rotation axis, or connecting rod length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the connecting rod length is changed to achieve different operating modes, then the press force and velocity can be adjusted, but the device complexity increases and the moved mass of the connecting rod increases
Solution Approach 1:
The patent applies the dynamics principle by making the connecting rod length changeable through a telescopic structure with adjustable segments. This allows the system to adapt to different operating modes (e.g., different stroke lengths and velocities) by dynamically adjusting the connecting rod length, thereby achieving versatility without requiring completely different mechanical arrangements for each mode.
Solution Approach 2:
The patent implements parameter changes by varying the length of the connecting rod as a key parameter to achieve different operating characteristics. By changing the connecting rod length parameter, the system can adjust the ram stroke, velocity, and force characteristics without modifying the fundamental knee lever gear structure, thus achieving adaptability through parameter variation rather than structural redesign.
2Adaptability or versatility
If the connecting rod length is changed to achieve different operating modes, then the press force and velocity can be adjusted, but the moved mass of the connecting rod increases
Solution Approach 1:
The patent applies segmentation by dividing the connecting rod into multiple segments that can be telescopically adjusted. Instead of using a single long connecting rod for all operating modes, the structure is segmented into adjustable sections that can be extended or retracted. This segmentation allows the system to use only the necessary length for each operating mode, thereby reducing the moved mass compared to a fixed long connecting rod while maintaining the ability to achieve different operating modes.
3Adaptability or versatility
If additional adjustment means are added to change the connecting rod length, then different operating modes become possible, but the design complexity increases
Solution Approach 1:
The patent applies universality by designing a telescopic connecting rod structure that serves multiple functions: it acts as both the connecting rod and the adjustment mechanism. The same structural element that transmits force also provides the length adjustment capability, eliminating the need for separate adjustment mechanisms. This multi-functionality achieves different operating modes while maintaining design simplicity, as the telescopic structure is integrated into the existing connecting rod rather than being an add-on.
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 design achieves a simple and robust press drive with minimal components, enabling precise positioning of the ram and varying press forces and velocities through automatic mode selection, reducing complexity and maintaining precision in different operating conditions.
Implementation Method 1
The knee lever gear is driven by an eccentric drive that can also be referred to as a crank drive. The knee lever gear couples the eccentric drive with a ram of the press, so that the driving motion of the eccentric of the eccentric drive effects a linear motion of the ram in stroke direction.
Data Source
AI summary
The invention relates to a press drive for a press or a press having a press drive. The invention also relates to a method for controlling the press drive by means of a control unit. The press drive is used for moving a ram of the press in a stroke direction H between an upper return point OT and a lower return point UT. It comprises a knee lever gear having a first lever and a second lever. A connecting rod engages on the knee lever of the two levers and is connected on the other end to an eccentric of an eccentric drive. The control unit can drive the eccentric drive in a first operating mode B1 or a second operating mode B2 or, in particular, also a third operating mode B3. In the first and the second operating modes B1, B2, the eccentric oscillates in a respectively different angle region W1, W2 about a rotation axis D of the eccentric drive, thus resulting in different force and movement states of the ram in both operating modes.