| At the present mobile garbage compression station which can be classified as combined and split,is widely used to dispose garbage in our country.The loading mechanism is one of the most important parts of mobile garbage compression station.Its performance has great influence on the operation of the whole equipment.Dynamic simulation analysis,optimal design and verifying the structure strength and stiffness of two typical loading mechanisms have important guiding significance to modify the mechanism.In this paper,two typical loading mechanisms of mobile garbage compression stations,named A-type and B-type loading mechanism,were studied.The dynamic simulation analysis and optimal design of two typical loading mechanisms were conducted with ADAMS,based on minimizing the maximum values of the motive force and driving power of the hydraulic cylinder.Results showed that the maximum values of the motive force and driving power of A-type loading mechanism reduced by 47.9%and 15.3%,with the optimization method of driving power.Meanwhile,those of the B-type loading mechanism decreased by 25.5%and 8.34%,respectively.Compared with the optimization method based on the driving power,the optimization method based on the motive force can make the maximum values of the motive force and driving power of the A-type were reduced by 39.7%and 14.6%,respectively,and those of the B-type loading mechanism decreased by 27.6%and 8.08%.In the previous literature,the study usually stopped after getting the dynamics optimization design parameters of the mechanism.However,the result of the second simulation analysis according to the parameters showed that A-type mechanism failed to achieve the desired closed condition in the same case.So,the driving torque of the active arm of A-type loading mechanism was calculated with the principle of virtual displacement.Besides,two mathematic models were built based on the graphic method of the four bar linkage design methods.In addition,the two transmission angles at different moment and the coordinate of the point connecting the active arm with the frame were taken as the variables.Then,the optimal design of A-type loading mechanism was completed,based on minimizing the maximum value of the driving torque.And the better mechanism parameters has been obtained.Finally,the static load analysis of the two special work conditions of the loading mechanism was carried on with ANSYS workbench,verified the structural strength and stiffness of the loading mechanism.Results showed that on dangerous work condition the maximum structural stress of A-type and B-type loading mechanisms was less than the yield strength of material.But the load capacity of the B-type waste compression station was greater than the load capacity of A-type under the same load.In this paper,compared with relevant literature,there are two major innovations.Firstly,the dynamics optimization design method based on minimizing the maximum drive power of the loading mechanism was put forward.Results of dynamic optimization simulation for two type loading mechanisms showed that this method worked better design parameters.Secondly,in consideration with the existing process about the dynamic optimization of mechanism,the configuration mechanism simulation should be conducted after obtaining the initial design parameters in order to preferably meet the requirements of engineering applications.In this paper,A-type loading mechanism was taken as an example to verify this process. |
