Mobile Roll Press with Interconnected Pressure Cylinders
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Solution Overview
Problem
Roll presses for compressing granular products require large machine frames due to high hydraulic forces needed for roll centering and pressure maintenance, making logistics and roll changes complex and costly.
Innovation Solution
The roll press design features two mobile rolls with pressure cylinders having oppositely directed working chambers that allow pressure medium circulation, enabling a fixed connection to the machine frame, reducing the frame's overall size and simplifying roll changes by eliminating the need to detach and reattach heavy pressure cylinders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If both rolls are configured as mobile rolls interconnected by pressure cylinders forming a closed system of forces, then the machine frame can be dimensioned in smaller overall size, but the effort involved in changing the rolls increases due to the need to detach and reattach heavy pressure cylinders
Solution Approach 1:
The pressure cylinder system is segmented into two independent single-acting pressure cylinders instead of one closed system, allowing the cylinders to be independently controlled and simplified during roll changes
Solution Approach 2:
A central pivot bearing is introduced as an intermediary element that absorbs and balances the forces from both pressure cylinders, eliminating the need for the machine frame to serve as a counter bearing and enabling easier roll changes
2Manufacturing precision
If large-sized hydraulic drives are used for roll centering and pressure maintenance, then the parallelism of the roll gap is maintained, but the machine frame must be designed in correspondingly stable configuration with large dimensions
Solution Approach 1:
The central pivot bearing acts as a mediator that absorbs the high hydraulic forces, allowing smaller hydraulic drives to be used while maintaining roll gap parallelism without requiring a large machine frame
Solution Approach 2:
The mechanical support function previously required from a large machine frame is replaced by the central pivot bearing, which mechanically balances the forces and enables the use of a smaller frame
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 configuration allows for a smaller machine frame, easier roll changes, and reduced hydraulic resistance through the use of larger diameter pipes, while maintaining pressure and control over the roll gap, balancing forces and reducing the effort required for roll replacement.
Implementation Method 1
at least one pressure cylinder having at least two working chambers... in which respectively two bearing housings of different rolls, arranged on one side of the rolls, are interconnected by means of at least one pressure cylinder having at least two working chambers
Data Source
AI summary
A roll press for the compression or compacting of granular products. Two detachable rolls separated by a roll gap are driven in opposite directions and mounted on shafts to rotate in a machine frame. The shafts of the mobile rolls are received in bearing housings arranged in a mobile manner in the machine frame. Two respective bearing housings of different rolls, arranged on one side of the rolls, are interconnected by at least one pressure cylinder having at least two working chambers. A method for centering mobile rolls in such a roll press. The at least two working chambers have a force effect acting in opposite directions, and are interconnected in such a way that a pressure medium can circulate between the chambers. In this way, the hydraulic system is positioned in a fixed manner on the machine frame, the rolls nonetheless being mounted in the machine frame in a floating manner.