| Aluminum alloy concrete formwork is an environmentally friendly,efficient,and reusable building material formwork.It is used in concrete pouring operations.Usually,the surface needs to be brushed with a release agent before use.After the mold is removed,the working surface will inevitably adhere to concrete residues.The current slag removal methods include manual methods,high-pressure water gun flushing methods,shot blasting methods,and chemical soaking methods.However,these methods have disadvantages such as high cost,incompleteness,strict technical process requirements,harmful to humans,and deviation from the concept of green environmental protection.There are deficiencies in the slag removal method,and a new type of slag removal method that is fast,efficient,economical,and environmentally friendly has become an urgent problem for enterprises.Based on the theory of vibration mechanics and elasticity of thin plate bending,this paper proposes a vibrating slag removal scheme,analyzes the separation mechanism of aluminum alloy formwork and adhering concrete under vibration,and designs a three-dimensional model of formwork vibration slag removal equipment based on the results of theoretical analysis.The main research work is as follows:First of all,the analysis and summary of domestic and foreign concrete vibration crushing technology,thin plate vibration technology,and static research on the bonding of concrete and aluminum alloy plates are summarized,and the critical deformation of the aluminum alloy plate surface when the slab slag is separated is obtained.Through the analysis of the vibration theory of the single-degree-of-freedom system and the continuum system,the rationality of the template vibration slag removal is discussed,and the mechanical vibration slag removal process is proposed.Secondly,through the analysis of the bending theory of the thin plate,the natural frequency and mode shape mathematical model of the simply supported aluminum alloy rectangular plate on the four sides are obtained;using the template as the elastic foundation,the mathematical model of the natural frequency of the concrete layer on the template is introduced..At the same time,the fundamental frequency of the aluminum alloy plate under different boundary conditions is calculated,and the influence of the constraint conditions on the natural frequency of the aluminum alloy plate is obtained.Through simulation,the modal data of the formwork and the adhesive concrete layer are compared with the theoretical data of the mathematical model,and it is verified that the thin plate bending theory is suitable for the theoretical research of this subject.The natural frequencies of concrete layers of different specifications are calculated,and the influence of factors such as concrete area and thickness on the natural frequencies is comprehensively analyzed.Then,through the modal analysis of the template with different constraints,the natural frequency of the template and the mode shape participating quality coefficient are extracted,and the constraint mode of simply supported on four sides is established.Then the harmonic response of the template was analyzed,and the frequency of the template under load and vibration removal of the template was determined.The influence of the location and number of excitations of concentrated harmonic loads on the slag removal effect of the template vibration is analyzed.After a comprehensive comparison,a slag removal scheme is established in which the concentrated harmonic load acts on the center point of the template.Finally,a model of the forced vibration slag removal equipment for the aluminum alloy concrete wall formwork was designed,the mathematical model of the vibration slag removal equipment movement was established,and the selection of the excitation motor and the conveyor motor and the presidential design of the control system were carried out. |
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