System with screen and unbalanced drive for screening machines
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Solution Overview
Problem
Existing screening machines with unbalanced drives for generating vibrations in the direction of material conveyance face issues with excessive 'dead' resonating mass, complex and heavy housing, and high space requirements due to unnecessary internal synchronization gears and lubrication systems.
Innovation Solution
A system with a stationary drive motor and synchromesh gear, where each output shaft is connected to a horizontal shaft with unbalance elements via a torsionally rigid cardan shaft, and unbalance modules are arranged between the side walls of the screen body, allowing for modular adjustment of unbalanced mass and reduced overall weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If internal synchronization gears and lubrication systems are included in unbalance modules, then synchronous rotational movement is achieved, but dead resonating mass and device complexity increase
Solution Approach 1:
The patent extracts the synchronization function from the moving unbalance modules and places it in a stationary external gear unit. This removes the internal synchronization gears and lubrication systems from the unbalance modules, eliminating their contribution to dead resonating mass while maintaining synchronous rotational movement through the external gear connection.
Solution Approach 2:
The patent divides the drive system into separate functional components: stationary drive elements (motor, gear unit) and moving unbalance modules. The synchronization function is segmented and assigned to the stationary gear unit, while the unbalance modules focus solely on generating vibrating forces, reducing their mass and complexity.
2Reliability
If internal synchronization gears and housing are included in unbalance modules, then synchronous operation is ensured, but space requirements and device complexity increase
Solution Approach 1:
The patent extracts the synchronization mechanism from the moving unbalance modules and relocates it to a stationary external gear unit. This removes the bulky housing and internal gears from the unbalance modules, significantly reducing their volume and simplifying their structure while maintaining synchronous operation through the external gear connection.
Solution Approach 2:
The patent segments the drive system into stationary synchronization components and moving unbalance components. The stationary gear unit handles synchronization, allowing the unbalance modules to be compact and simple in design, thereby reducing overall space requirements.
3Productivity
If unbalanced masses are increased for higher vibrating power, then screening performance improves, but dead resonating mass increases
Solution Approach 1:
The patent segments the system into stationary mass (motor, gear unit) and moving mass (unbalance modules). This allows increasing unbalanced masses in the modules for higher vibrating power without adding to dead resonating mass, since the stationary components do not participate in the vibration.
Solution Approach 2:
The patent inverts the conventional approach by making the drive system stationary and the unbalance modules moving. This allows the unbalanced masses to be part of the oscillating mass rather than dead mass, enabling higher vibrating power with proportional increases in useful oscillating mass rather than harmful dead mass.
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 design minimizes the 'dead' resonating mass, reduces space and weight requirements, and allows for modular adjustment of unbalanced mass, enabling more efficient and cost-effective screening machines with higher throughput and easier transportation.
Implementation Method 1
connected to the output shaft by means of a torsionally rigid cardan shaft
Implementation Method 2
unbalanced drive for generating linear vibrations in the direction of conveyance of the material to be screened
Implementation Method 3
The unbalance elements are arranged directly on the shafts and in the horizontal direction between the side walls of the screen body
Data Source
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AI summary
Drive device for a screening body of a screening machine in particular for mineral materials for crushing, such as oil sand, with a drive motor, a synchronous transmission which is operatively connected thereto and has at least two output shafts which rotate in pairs in antiphase at the same rotation speed with respect to one another, wherein the drive motor and the synchronous transmission are mounted in a stationary manner, separately from the screening body, at the side alongside the screening body, and do not also oscillate therewith, and each output shaft has a single associated horizontal shaft which has unbalance elements, is connected to the output shaft by means of a rotationally rigid universally jointed shaft and is arranged with its axis parallel to the adjacent shaft and transversely with respect to the feed direction of the screening body, the unbalance elements are arranged in the horizontal direction between the side walls of the screening body, the shaft is supported by means of bearing elements on a crossmember which is connected to the side walls, the unbalance elements are arranged exclusively directly on the shafts, bearing elements are arranged exclusively on the shafts in the axial direction of the shafts between the unbalance elements, and the bearing elements are supported on a crossmember which is connected to the side walls.