Vibrating Screen Suspension with Dual Pivot Friction Damping
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Solution Overview
Problem
Vibrating screens face instability and excessive vibration when operating at various sloped positions due to vertically mounted springs becoming tilted, leading to uneven weight distribution and increased stress during startup and shutdown, where existing damping methods are either maintenance-intensive or limited to vertical motion.
Innovation Solution
Incorporating inwardly angled internally parallel spring groups and a bi-directional dual pivot friction damping system to enhance stability and reduce vibration, allowing for compact design and effective damping across multiple orientations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If vertically mounted springs are used to support the vibrating screen, then the spring structure is simple and easy to install, but the springs become tilted when the screen operates at various sloped positions, causing instability and uneven weight distribution
Solution Approach 1:
The patent employs adjustable spring mounting positions and adjustable screen frame slope angles, transforming the static spring support system into a dynamic one that can adapt to different operating conditions. The spring groups can be repositioned along the frame, and the frame itself can be adjusted to various slopes, allowing the system to maintain optimal performance across different operational scenarios.
Solution Approach 2:
The patent changes the parameters of the spring support system by allowing adjustment of spring mounting positions and screen frame angles. This enables the system to optimize its performance parameters (stability, weight distribution) for different operating conditions, particularly when transitioning between horizontal and sloped positions.
2Object-affected harmful factors
If the spring rate is reduced to provide significant isolation from the mounting structure, then vibration transmittance is minimized, but the natural frequency becomes lower than the vibration frequency, causing amplified motion and surge during startup and shutdown
Solution Approach 1:
The patent introduces a friction damper as an intermediary element between the screen and the spring support system. This damper absorbs and dissipates the surge energy during startup and shutdown, preventing the amplified motion from causing excessive stress on the screen and support structure while allowing the soft springs to continue providing vibration isolation during normal operation.
Solution Approach 2:
The patent converts the harmful surge motion into beneficial frictional heat energy through the friction damper. The damper utilizes friction to dissipate the excessive kinetic energy generated during natural frequency passage, transforming the harmful mechanical stress into harmless thermal energy.
3Loss of energy
If existing friction damping devices are used to dampen surge during startup and shutdown, then some vibration energy is dissipated, but these devices require continual maintenance or only dampen vertical motion
Solution Approach 1:
The patent designs a universal friction damper that provides damping in multiple directions (vertical, horizontal, and diagonal), making it applicable to various surge conditions regardless of the direction of motion. This multi-functional approach eliminates the need for separate damping devices for different orientations and reduces maintenance requirements.
Solution Approach 2:
The friction damper is designed to be self-adjusting and self-neutralizing, automatically adapting to varying loads and operating conditions without requiring manual intervention or maintenance. The device maintains effective damping across different orientations and load conditions through its inherent design characteristics.
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 solution provides increased stability and reduced vibration by adjusting spring stiffness and using a self-adjusting, self-neutralizing damping mechanism that maintains effective damping across varying loads and orientations, minimizing damage and maintenance needs.
Implementation Method 1
The springs are usually mounted in a vertical orientation... vertically mounted springs 14 and 16 would become tilted with the change of slope and become unstable
Implementation Method 2
There are various styles of damping methods used today, most utilizing some type of friction device to dissipate some of the energy during the surge
Data Source
AI summary
A compact mobile variable angle vibrating screen with a suspension and dampening system configured to accommodate variable angles and exhibit acceptable vibration levels; especially during power up and power down surge vibration at the variable angles. The system comprises a group of bi-directional dual pivot leg vibration damper mechanisms which are effective only during times of excessive vibration such as during the power up and power down vibration surges.