| With the promulgation of national "Environmental protection,energy conservation and emission reduction" policy,conveyor energy-saving transportation becomes an important topic.The intelligent energy saving control system technology has realized the belt conveyor’s "feed on demand,fixed the speed according to the material,control the energy consumption",and promoted the belt conveyor to develop towards the direction of saving energy and reducing consumption,reducing staff and increasing efficiency and intelligence and safety.In the intelligent energy-saving control system,real-time dynamic detection of materials is an important basis for intelligent control,energy-saving operation and safety monitoring of belt conveyors.Therefore,it is necessary to study and design an accurate real-time dynamic material flow detection device to realize intelligent energy-saving control of belt conveyor.On the basis of analyzing the measurement problems of the existing dynamic weighing device(electronic belt scale),the main influencing factors of the measurement accuracy of the electronic belt scale are explored in this paper.By the principles of mechanical design theory,dynamic weighing technology and filtering technology,a new dynamic weighing device,the suspension hoisting belt scale,was designed.The specific content of the paper is divided into the following points:Firstly,the research situation of the dynamic weighing device at domestic and abroad is introduced.The advantages and disadvantages of the various weighing devices and the utilization rate are analyzed.It is concluded that the electronic belt scale is a measuring device with wide application range and good operation.Aiming at the measurement problems existing in the belt scale,the error factors affecting the weighing of the belt scale are analyzed from the belt scale composition,weighing principle and signal transmission process.It is concluded that there are five types of error sources in the electronic belt scale,and the most important factor is the weighing error.The "belt effect" produced by multi-factor cross-coupling is the main influencing factor of weighing error.Secondly,aiming at the "belt effect" of the conveyor belt,according to the dynamic characteristics of the conveyor belt and the finite element analysis method,a discrete model of the conveyor belt in the weighing area is established,and the ordinary differential equation of vibration of the conveyor belt in the weighing area is derived.Using MATLAB Software to solve ordinary differential equations,it is concluded that the horizontal and vertical vibration of the conveyor belt in the weighing area caused by the tension change is the main influencing factor of the belt scale production error.Then,for the main influencing factors of the belt scale measurement,the influence of the symmetry quantity of the error factor is reduced from the aspects of device structure design,system control and hardware and software selection.A new dynamic weighing device,the suspension hoisting belt scale,is designed.In the design of mechanical structure,a dynamic weighing platform is established,which consists of a number of "double-character" roller groups and is fixed side by side.The simulation analysis with Ansys software shows that the smooth running effect of the conveyor belt under the constraint of weighing platform roller group is better.Aiming at the velocity measurement of conveyor belt,a high precision speed measuring device is designed for weighing and measuring velocity.Finally,for the interference signal present in the output signal of the device,based on the Kalman filter and the signal output of the new dynamic weighing device,the double adaptive Kalman filter algorithm for signal processing is proposed.By collecting experimental data and filtering,the results show that the double adaptive Kalman filter algorithm can eliminate the interference noise in the weighing signal data and improve the accuracy of the weighing output signal data. |
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