Direct Eccentric Drive for Continuous Casting Mold Oscillation
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Solution Overview
Problem
Existing oscillating drives in continuous casting plants are complex, maintenance-intensive, and inefficient, with limitations in adjusting amplitude, frequency, and waveform, and are prone to high operating costs and safety risks due to hydraulic systems or mechanical wear.
Innovation Solution
A compact oscillating drive system using a high-torque electric rotary motor that directly drives an eccentric without gears, allowing adjustable amplitude, frequency, and waveform through angular range and speed control, with a control unit for optimal mold oscillation settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rotating eccentric drive with electric motor, reduction gear and clutch is used, then the mold oscillation function is achieved, but the design complexity, maintenance effort and operating effort increase considerably
Solution Approach 1:
The patent removes the reduction gear and clutch from the drive system, keeping only the electric motor and eccentric. This extraction of unnecessary components directly reduces design complexity and maintenance effort while preserving the essential oscillation function through direct motor-to-eccentric coupling.
Solution Approach 2:
Instead of using a complex multi-stage transmission system (motor→reduction gear→clutch→eccentric), the patent inverts the approach by using direct drive (motor→eccentric). This simplifies the system architecture while achieving the same functional outcome with fewer components.
2Reliability
If a fixed-stroke eccentric drive is used, then the oscillation function is achieved, but the amplitude adjustment can only be made by adjusting the eccentric position at a standstill
Solution Approach 1:
The patent makes the oscillation amplitude dynamically adjustable during operation by controlling the rotational speed of the eccentric. Instead of fixed mechanical adjustment, the system allows real-time modification of amplitude characteristics through variable speed control, enabling adaptation to different casting conditions without stopping the process.
3Adaptability or versatility
If two interacting eccentrics with common gear arrangement are used, then continuous amplitude change during operation is possible, but the construction becomes very complex and maintenance-intensive
Solution Approach 1:
The patent eliminates the second eccentric and the common gear arrangement entirely, using only a single eccentric driven directly by the electric motor. This extraction of redundant components maintains the ability to adjust amplitude through speed control while dramatically reducing construction complexity and the number of moving parts subject to wear.
4Adaptability or versatility
If an electrohydraulic servo device is used, then amplitude and frequency can be varied during operation, but the acquisition, installation and maintenance costs increase and fire risk arises
Solution Approach 1:
The patent replaces the electrohydraulic servo system with a direct electromechanical drive (electric motor + eccentric). This substitution eliminates hydraulic fluid and associated fire risks while maintaining the ability to vary amplitude and frequency through electronic motor control. The mechanical simplicity also reduces acquisition, installation, and maintenance costs.
5Reliability
If an electromechanical lifting cylinder with lead screw and recirculating ball or planetary roller drive is used, then rotary movement conversion is achieved, but high loads at contact points result in limited service life
Solution Approach 1:
The patent removes the lead screw, recirculating balls, and planetary rollers entirely, replacing them with a direct eccentric mechanism. This extraction eliminates the high-contact-load components that have limited service life, while the eccentric's rolling contact with the mold table provides sufficient movement conversion with significantly reduced wear and extended durability.
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 precise and efficient mold oscillation with reduced maintenance, lower operating costs, and improved safety by allowing independent adjustment of oscillation parameters, enhancing the casting process with flexible stroke profiles and reduced wear.
Implementation Method 1
A compact oscillating drive system using a high-torque electric rotary motor that directly drives an eccentric
Implementation Method 2
allowing adjustable amplitude, frequency, and waveform through angular range and speed control
Data Source
Figure 1~2
Figure 3~6
AI summary
The device features a motor-driven eccentric (3) equipped with a pull rod (5) that acts on the mold (1) via a two-armed linkage (6, 7). The eccentric (3) is driven by a rotary drive motor (4), whereby the amplitude, frequency, and waveform of the mold oscillation are adjustable by changing the adjustment angle (α) or the angular velocity (ω) of the rotary drive motor. The device is characterized by a robust, compact, and user-friendly design that operates reliably and ensures stepless adjustability of the amplitude, frequency, and waveform of the mold oscillation during operation.