Discharge Chute Protective Grille Shear Force Clogging
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Solution Overview
Problem
Existing ejection chutes for construction mixing machines, such as those used for mortar, plaster, and concrete, often clog due to mix materials forming lumps that stick to the protective grille, leading to complex and time-consuming service measures for clearance.
Innovation Solution
An ejection chute with a positionally variable protective grille that applies a shearing force to detach and dissolve lumps, featuring displaceable lattice bars that can be moved relative to fixed bars, allowing for effective clearance of adhering materials without significant structural changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective grille is installed in the ejection chute to prevent access to the mixing container, then safety is improved, but the grille causes material lumps to stick and form blockages
Solution Approach 1:
The protective grille is transformed from a static structure to a dynamic one by making at least one partial area positionally variable. This allows the grille to actively respond to material accumulation by applying shearing forces through positional changes, thereby preventing clogging while maintaining safety protection.
2Reliability
If a protective grille with lattice structure is used, then protection function is achieved, but material accumulations form on the grille requiring complex service measures
Solution Approach 1:
The protective grille is equipped with the ability to clear its own blockages by applying shearing forces through positional changes of at least one partial area. This self-cleaning function eliminates the need for complex dismantling and service measures, as the grille can restore its functionality autonomously by detaching material accumulations.
3Stability of the object's composition
If the protective grille is made fixed and stable, then structural integrity is improved, but material lumps cannot be effectively removed
Solution Approach 1:
The protective grille is divided into different functional zones: a fixed portion that maintains structural integrity and a positionally variable partial area that enables material removal through shearing forces. This segmentation allows the grille to simultaneously achieve stability and operational effectiveness for clearing material lumps.
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 prevents clogging by easily removing and dissolving material accumulations, ensuring a functionally reliable operation of the ejection chute even with thixotropic mix materials that tend to form lumps, thereby reducing maintenance efforts and ensuring continuous operation.
Implementation Method 1
a force or force component, in particular a shear stress or shearing force, occurs when the at least one partial area of the safety gate changes position, can be applied to a mix adhering to or lying on the protective grid
Implementation Method 2
many mix materials that tend to stick or form lumps show a kind of thixotropic behavior, so that adhesions and lumps break up when a force or force component is applied, especially when shearing stress or shearing force is applied
Data Source
Figure 1
Figure 2a~2c
Figure 3a~3c
AI summary
The invention relates to a discharge chute for a mixing machine (1), in particular for a construction mixer, for mixing materials, especially mortars, plasters, screeds or concrete, with a protective grid (23) arranged inside the discharge chute. According to the invention, at least a portion of the protective grid (23) is designed and/or arranged to be positionally adjustable, in particular such that a force or force component can be applied to a mixture adhering to or resting on the protective grid (23) when the position of at least one portion of the protective grid (23) is changed.