Symmetrical Roller Press Drive Torque Synchronization
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Solution Overview
Problem
High-pressure roller presses face issues with asymmetrical load distribution between paired drive motors, leading to uneven torque transmission and increased wear on grinding rollers, as well as the tendency for the roller gap to open due to asymmetrical drive systems, which complicates maintenance and increases energy consumption.
Innovation Solution
Implementing a device that synchronizes the power output between drive motors on both sides of each grinding roller, using torque pickups and speed measurements to ensure symmetrical load distribution and prevent roller misalignment, with the option to suppress synchronization during startup and detect potential malfunctions by comparing electrical power consumption and mechanical output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a one-sided drive system is used to reduce device complexity and cost, then the number of motors is reduced, but asymmetrical load distribution and roller gap opening occur
Solution Approach 1:
The patent applies asymmetry principle by intentionally introducing asymmetrical counterweights on the driven roller to compensate for the asymmetrical drive system. The counterweights are positioned to create asymmetrical gravitational forces that balance the asymmetrical load distribution caused by the one-sided drive, thereby maintaining symmetrical contact pressure between rollers while keeping the drive structure simple.
2Reliability
If paired drive motors are used to achieve symmetrical load distribution, then load symmetry is improved, but synchronization difficulties and increased device complexity arise
Solution Approach 1:
The patent extracts the synchronization function from the drive system by removing the need for complex electronic synchronization between paired motors. Instead, it uses a single drive motor combined with asymmetrical counterweights on the driven roller, eliminating the synchronization problem entirely while maintaining symmetrical load distribution through mechanical balance.
3Device complexity
If asymmetrical drive systems are used to simplify the drive structure, then device complexity is reduced, but roller gap opening and increased wear occur
Solution Approach 1:
The patent applies counterweight principle by installing asymmetrical counterweights on the driven roller that generate gravitational forces to compensate for the roller gap opening tendency caused by the asymmetrical drive system. The counterweights are positioned to create balancing moments that prevent the roller gap from opening, thereby eliminating harmful effects while maintaining structural simplicity.
4Device complexity
If asymmetrical drive systems are used to reduce the number of motors, then device complexity is reduced, but energy consumption increases due to inefficiency
Solution Approach 1:
The patent applies preliminary action principle by pre-balancing the asymmetrical drive system through fixed asymmetrical counterweights on the driven roller. This preliminary mechanical balancing ensures that the drive system operates with symmetrical load distribution from the start, maximizing drive efficiency and minimizing energy losses without requiring additional motors or complex control systems.
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
This approach reduces the tendency for the roller gap to open, enhances drive efficiency, and simplifies maintenance by using smaller, lighter motors, while allowing for precise balancing of power output and early detection of potential drive issues.
Implementation Method 1
the device for measuring the power output determines the decrease in torque via a torque pickup and the speed
Implementation Method 2
The motors transmit an asymmetrical 'walking motion' to the loose roller
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a rolling press (1) for comminuting brittle grinding material, comprising a first grinding roll (22) and a second grinding roll (23). At least one grinding roll is an idle roll (23) which is movably mounted in a machine frame (24), and at least one grinding roll (22, 23) has an electric drive. According to the invention, the electric drive (28, 28', 29, 29') of the at least one grinding roll (22, 23) is located on both sides, at both ends of the roll(s).