Mechanical Vibrator Eccentric Mass Adjustment
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Solution Overview
Problem
Existing compact mechanical vibrators for vibrating screens face challenges such as increased internal space occupation, unbalanced load distribution, and reduced accessibility for eccentric mass adjustment, leading to bending moments and reduced equipment lifespan due to dust penetration during reassembly.
Innovation Solution
A mechanical vibrator design featuring a bearing housing with symmetrically positioned bearings supporting a short shaft with internal and external counterweights of different masses and radial extensions, allowing external adjustment of the total eccentric mass without disrupting load balance, thus eliminating bending moments and facilitating easier sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If eccentric counterweights are located on both sides of the side wall to enable external adjustment, then accessibility for setting is improved, but internal space occupation increases and sealing becomes more difficult
Solution Approach 1:
The vibrator is divided into two independent bearing housings, each with its own shaft and counterweight assembly. This segmentation allows each unit to be adjusted independently from the external side without requiring internal access, resolving the contradiction between accessibility and internal space occupation.
Solution Approach 2:
The counterweights are positioned entirely in the external dimension relative to the side wall, eliminating the need for internal counterweight placement. This dimensional repositioning allows adjustment from outside while minimizing internal space usage and simplifying sealing requirements.
2Speed
If compact arrangement with short shaft is used, then bearing dimensions are reduced and rotation speed increases, but load distribution balance becomes difficult to maintain
Solution Approach 1:
The two bearing housings are positioned asymmetrically relative to the vibrating element, with each housing at a different location along the vibrating surface. This asymmetric placement, combined with appropriately sized counterweights in each housing, balances the load distribution on the short shaft while maintaining high rotation speed capability.
Solution Approach 2:
Each bearing housing is designed with specific local characteristics - different counterweight masses and positions - to optimize load distribution at each location. This local customization allows the compact short shaft design to maintain balance despite the reduced bearing dimensions and higher rotation speeds.
3Ease of operation
If protective casing is removed for internal counterweight adjustment, then accessibility is improved, but sealing reliability deteriorates and dust penetration increases
Solution Approach 1:
The counterweight adjustment function is extracted from the internal environment and relocated to the external side of the protective casing. This extraction eliminates the need to remove or compromise the sealing of the protective casing, maintaining dust protection while enabling easy adjustment.
Solution Approach 2:
The counterweight assembly is designed to be self-adjusting from the external side, with features such as external adjustment mechanisms that allow operators to modify counterweight positions without opening the protective casing. This self-service capability maintains sealing integrity while providing accessibility.
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 enables high-speed operation with reduced bearing dimensions, balanced force distribution, and minimized internal space usage, reducing dust ingress and extending equipment lifespan by allowing external adjustment of eccentric masses while maintaining load balance and eliminating bending moments.
Implementation Method 1
a determined portion of a shaft carrying eccentric counterweights and being connectable to a motor unit
Implementation Method 2
mechanical vibrator having eccentric masses... which utilizes linear, circular or elliptical motions
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
The mechanical vibrator is applied to vibrating screens or other equipment and comprises a bearing housing (10) to be affixed to a side wall (2) of the equipment (1), to carry a pair of bearings (20) which support a shaft (30) having an inner end portion (31) and an outer end portion (32) which respectively affix a first and a second counterweight (70, 80). The first and the second counterweights (70, 80) have respective first and second eccentric masses (M1, M2) of different values and which are positioned and dimensioned so that the first and the second counterweight (70,80) generate equal loads on the bearings (20). The second counterweight (80) is constructed to selectively and removably attach a third counterweight (90) presenting a third eccentric mass (M3) maintained aligned with the center line (CL) of the bearing housing (10), to provide a variation of the total eccentric mass of the vibrator (V), without changing the balance of the load distribution on the bearings (20).