| The multi-rope friction hoist is more familiar lift-equipment in the coal mining. It's safety and high efficiency producing has close relation to mine production. In this paper, we developed the detective skip unloading and control system to the multi-rope mine hoist. According to the analysis of the harm of no finish unloading and the study of test-technology available now, we make sure the scheme to the detective and control system. Based on the experiment, we also determined some relative parameters and achieve the hardware and software designs. Based on the specialties of hoist working, structure of skip and the situation of work place, we approach and test some sensors for material surface detective .We also analysis their reliability and feasibility for application. We make the application of radar principle for distance to skip-unloading detective as emphases. This system is tested in laboratory. The skip unloading process data are captured using radar-detective method, which represent the skip unloading status. This system has many advantages. They are high accuracy of measurement, anti-jamming performance, low cost as well as easy and safe operation.This detective and control system is composed of the master computer and the slave computer. Industrial PC is used as master computer. It carries out the program in VB 6.0 to collect the real-time data from the skip-unloading process, draw the real-time and historical curves and to correct the control parameters to achieve the skip-unloading monitor. Windows is the development platform and Visual Basic 6.0 is the development tool to this test system we design.We make use of object-oriented programming technique based on DAO (Data Access Object) model and set up the repository of test system using Microsoft Access database.The system we design has some characters, such as friendly interface, easy operation, good intercommunion between human and computer and topping automatism. So the system will have wide scopes of application.
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