| Electric shovel is an important mining equipment in open-pit mine,which is widely used in ore stripping and loading.Due to the lack of supervision between shovel loading and Tramcar Transportation,the total amount of ore loaded by the shovel is different from that transported by the tramcar to the destination.Sometimes the total amount of ore transported to the destination is less than that loaded by the shovel,resulting in ore loss and"ton loss",which has a negative impact on the production and operation of the mine.At present,there is an urgent need for a scheme that can realize the real-time weighing of the excavated ore by the shovel.Through the shovel weighing system,we can clearly know the material weight of each shovel of the shovel,and then we can get the material weight loaded by the mine car.At the same time,it plays a regulatory role in the loading of the shovel to avoid the phenomenon of "ton loss".Therefore,it is necessary and urgent to develop the weighing scheme of electric shovel.In order to achieve this goal,the following work and research have been carried out:(1)Access to literature,understand the basic structure and composition of the shovel and the working principle and mode of the shovel,describe the current situation of the shovel weighing,and analyze two schemes of the shovel weighing by using the principle of torque balance and the principle of Newton’s second law.(2)The weighing scheme of electric shovel is designed by calibration method,and the experiment is carried out in the working environment of actual mining.Make the pushing pinion and the stick in four different relative positions.At each relative position,lift or lower the lifting steel wire rope to make the shovel rod in different positions for testing,collect the experimental data,draw the obtained data into a curve,and verify whether there is a linear relationship between the steel wire rope tension T and the angle α between the steel wire rope and the horizontal line.(3)According to the known geometric parameters of the shovel,the 3D solid modeling of the shovel is carried out with UG software to prepare for the later simulation work.(4)Based on the principle of force system balance,the weighing system of electric shovel is established.The weighing force analysis of the electric shovel with the boom as the isolator is carried out,and the bucket,bucket and materials are regarded as a whole.The mass of the materials in the bucket can be calculated by measuring the reaction force at the hinge,the tension of the suspension cable and the lifting force provided by the lifting motor for the bucket.Finally,the assembled shovel weighing model is imported into Adams to simulate the actual shovel weighing process,restrict and drive the working device of the shovel,and carry out the dynamic simulation of the weighing of the shovel.The tension of the suspension cable,the tension of the steel wire rope to the bucket and the force in the Y direction of the hinge are obtained,so as to verify the accuracy of the weighing system proposed above.In this thesis,the initial design of the electric shovel weighing scheme is analyzed,and field experiments prove that this scheme is not feasible.Then,a more reliable electric shovel weighing scheme is further proposed,and the dynamic simulation of the weighing process is carried out,which simulates the feasibility of the scheme and provides a discussion on the scheme for the implementation of electric shovel weighing in the mine. |
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