TBM tunneling test bench for microwave-assisted rotary rock breaking

A TBM tunneling test bench for microwave-assisted rotary rock breaking comprising a tunneling test bench body and a microwave-assisted rock breaking system,

• wherein the tunneling test bench body comprises a base, a turnover bracket, a movable bracket, turnover oil cylinders, a pushing oil cylinder and a cutter head;
• the base is fixedly arranged on a ground, and the turnover bracket is hinged to the base, and is freely rotatable around a hinge shaft;
• the turnover oil cylinders are connected between the base and the turnover bracket, cylinder barrel ends of the turnover oil cylinders are hinged to the base, and piston rod ends of the turnover oil cylinders are hinged to the turnover bracket;
• the movable bracket coaxially sleeves the turnover bracket, and the movable bracket has an axial movement degree of freedom relative to the turnover bracket;
• the pushing oil cylinder is connected between the turnover bracket and the movable bracket, a cylinder barrel end of the pushing oil cylinder is hinged to the turnover bracket, and a piston rod end of the pushing oil cylinder is hinged to the movable bracket;
• the cutter head is located in the movable bracket, the cutter head and the movable bracket are coaxially arranged, the cutter head is connected with the movable bracket through bearings, and the cutter head has a rotation degree of freedom relative to the movable bracket;
• cutter head rotation driving motors are mounted in the movable bracket, and motor shafts of the cutter head rotation driving motors and the cutter head are in power transmission through gears;
• the microwave-assisted rock breaking system is mounted between the movable bracket and the cutter head;
• and a rock sample bearing and placing box is arranged on the turnover bracket on an opposite side of the cutter head, a rock sample is fixedly mounted in the rock sample bearing and placing box, and each hobbing cutter of the cutter head is right opposite to a surface of the rock sample,
• wherein the microwave-assisted rock breaking system comprises a microwave generator, an isolator, a tuner, a first transmission waveguide, a rotating waveguide, a power divider, two flexible waveguides, two second transmission waveguides and two microwave heaters;
• the rotating waveguide is mounted at a center of the cutter head, a microwave output end and a microwave input end of the rotating waveguide adopt a coaxial sleeving structure, the microwave output end of the rotating waveguide has a rotating degree of freedom relative to the microwave input end, and the microwave output end of the rotating waveguide is fixedly connected with the cutter head;
• the microwave generator is fixedly mounted on the movable bracket, a microwave output end of the microwave generator and the microwave input end of the rotating waveguide are connected sequentially through the isolator, the tuner and the first transmission waveguide;
• the isolator is used for absorbing microwave energy which is not absorbed by the rock sample and reflected backwards;
• the tuner is used for automatically matching and adjusting impedance, so that microwave energy generated by the microwave generator is sufficiently absorbed by the rock sample;
• and a microwave input end of the power divider is connected with the microwave output end of the rotating waveguide, a microwave output end of the power divider is divided into two paths for output, each path is connected with one flexible waveguide, one microwave heater is connected to the microwave output end of each flexible waveguide, and a microwave output end of each microwave heater is right opposite to the surface of the rock sample.