Study On The Mechanism Of High Voltage Pulse Crushing Of Airport Runway And The Explosive Device

High pressure pulse crushing technology has been applied in construction,metallurgy,medicine,mining,airport and other fields,especially in underground mining,rock crushing,stone crushing and other high pressure pulse technologies.The explosive method or mechanical method used for airport runway crushing has the disadvantages of low efficiency and high energy consumption.Therefore,this paper puts forward the research on the mechanism of high-voltage pulse crushing and the blasting device of airport runway.The influence of different electrode structures of high-voltage pulse burst device on discharge energy loss is studied by using self-made simulation software.The simulation results show that when other conditions are the same,the time for the pin plate electrode structure to reach the critical electric field strength of distilled water is short,the breakdown voltage is small,the time for establishing the discharge channel is short,and the energy consumption for breakdown is small.The pin plate electrode structure was used to simulate the discharge fragmentation,and the solid-liquid discharge fragmentation model was established.Different volume concrete,reinforced concrete and asphalt models are used to conduct crushing simulation.The simulation results show that the field strength near the asphalt pole of the same thickness first reaches the critical field strength,followed by plain concrete,and finally reinforced concrete;The asphalt has the shortest discharge time and the lowest breakdown voltage;The power consumption of asphalt is the minimum,that of plain concrete is the middle,and that of reinforced concrete is the maximum.Then,three material finite element models are established to analyze the damage characteristics of asphalt,plain concrete and reinforced concrete caused by high-voltage pulse discharge.It is assumed that all the injected energy is converted into equal energy explosives during the crushing process.During the crushing process of high-voltage pulse discharge,the discharge channel is a cylindrical channel,and the energy will be transferred to the dielectric around the discharge channel during the crushing process.By comparing the stress and deformation position of the inner wall of the channel during TNT explosion,it is found that the asphalt has the largest deformation in the crushing process,which can be inferred that the energy consumed in the high-voltage pulse discharge process is the least.According to the discharge energy loss of different electrode structures,the discharge electrode structure in the high-voltage pulse blasting device is determined.The PLC control mode is adopted.Based on the TDS series digital oscilloscope,the voltage and current during the discharge process,the discharge air gap,etc.are displayed.Through the digital display control,the safety system of the blasting device is improved.Finally,the design of the high-voltage pulse blasting device is completed.The test shows that the crushing effect of the device is obvious.