金刚石串珠绳锯切割受载煤体试验装置的研制及受力分析

Development and force analysis of diamond beaded wire saw cutting loaded coal test device

为解决传统金刚石串珠绳锯切割试验系统难以同时满足试件受载和锯切力测量的问题,研制了一种金刚石串珠绳锯切割受载煤体的试验装置。该装置可对受载试件实现垂直向下连续切割(进给速度0~20mm/min、线速度0~10m/s、侧向加载系统可对受载试块施加0~500kN的载荷)。通过分析该试验装置切割前及切割过程中串珠绳锯的受力特点,给出了金刚石串珠绳锯加工过程中串珠绳锯绳长和张紧力的计算公式,建立了绳锯切割受载煤体的锯切力模型,经过验证,该锯切力模型得到的锯切力与传统装置测量的锯切力基本吻合。通过对该装置进行测试,结果表明:使用初始绳长为5666mm、直径分别为4.0mm和7.3mm的串珠绳锯以进给速度5mm/min、线速度4m/s对受载煤体进行切割时,串珠绳锯的张紧力分别为609.0N、1270.2N,法向锯切力分别为33.4N、187.6N,切向锯切力分别为20.8N、108.0N。

In order to solve the problem that it is difficult for the traditional diamond beaded wire saw cutting test system to satisfy loading and sawing force measurement at the same time,a test device for diamond beaded wire saw cutting loaded coal has been developed.The device can realize vertical downward continuous cutting on the loaded specimen(feed speed O~20mm/min,line speed 0~10 m/s,lateral loading system can apply load of O~500kN to the coal).By analyzing the force characteristics of the beaded wire saw before and during the cutting process of the test device,the calculation formulas of the wire length and tension of the beaded wire saw during the processing of the diamond beaded wire saw were proposed.The sawing force model of the wire saw cutting the loaded coal body was established.After verifying the sawing force model,the sawing force obtained is basically consistent with the sawing force measured by the traditional device.Through the test of the device,the results show that when using the beaded wire saw with an initial wire length of 5666mm and a diameter of 4mm or 7.3mm to cut the coal specimen block with a feed speed of 5mm/min and a linear speed of 4m/s.The tension force of the beaded wire saw is 609.0N and 1270.2N,the normal sawing force is 33.4N and 187.6N,and the tangential sawing force is 20.8N and 108.0N.