公开(公告)号：US11965860B2

公开(公告)日：2024-04-23

申请号：US17618378

申请日：2020-12-08

Applicant: Northeastern University

Inventor： Xiating Feng ,  Jiuyu Zhang ,  Feng Lin ,  Shiping Li ,  Xiangxin Su ,  Tianyang Tong

IPC: E21D9/00 ,  E21B7/00 ,  G01N3/06 ,  G01N3/12 ,  G01N3/60 ,  G01N22/02

CPC classification number: G01N3/068 ,  G01N3/12 ,  G01N3/60 ,  G01N22/02 ,  G01N2203/0019 ,  G01N2203/0048 ,  G01N2203/0057 ,  G01N2203/0067 ,  G01N2203/06 ,  G01N2203/0647 ,  G01N2203/0658

Abstract: Provided is a test system for hard rock breaking by a microwave intelligent loading based on true triaxial stress, including: a true triaxial stress loading device consisting of a loading frame and a rock sample moving structure; a microwave-induced hard rock breaking device consisting of an excitation cavity, a rectangular waveguide, a magnetron, a thermocouple, a circulator, a cold water circulation device, a flowmeter, a power meter, an automatic impedance tuner, a coupler, a microwave heater and a shielding cavity; and a dynamic rock response monitoring and intelligent microwave parameter control system consisting of a CCD industrial camera, a temperature acquisition device and an anti-electromagnetic high-temperature resistant acoustic wave-acoustic emission integrated sensor. According to the test system, the microwave-induced hard rock breaking test, dynamic monitoring temperature and rock breaking in microwave-induced breaking process and intelligent control over microwave power and heating time are achieved.

公开(公告)号：US12188338B2

公开(公告)日：2025-01-07

申请号：US18260454

申请日：2023-04-21

Applicant: Northeastern University

Inventor： Feng Lin ,  Xiating Feng ,  Chengxiang Yang ,  Jiuyu Zhang ,  Shiping Li ,  Tianyang Tong ,  Xiangxin Su

IPC: E21B43/26 ,  E21B7/15

Abstract: A microwave drill bit capable of achieving fracturing of a borehole wall and end of a deep hard rock while drilling and a use method thereof are provided. The microwave drill bit comprises a microwave drill bit body, wherein a support frame front plate, a metal sleeve and a water inlet ring sequentially sleeve on the microwave drill bit body, the metal sleeve is connected with a rotary drive I mounted on the support frame front plate, the microwave drill body is connected with a microwave mode converter and a microwave splitter II respectively, the microwave mode converter and the microwave splitter II are connected with a microwave splitter I by a rectangular waveguide, the microwave splitter I is sequentially connected with a microwave rotating joint, a fixed waveguide and a microwave generator, and the microwave rotating joint is connected with a rotary drive II mounted on the support frame rear plate.

公开(公告)号：US12109572B2

公开(公告)日：2024-10-08

申请号：US17792592

申请日：2020-05-21

Applicant: Northeastern University

Inventor： Xiating Feng ,  Feng Lin ,  Shiping Li ,  Xiangxin Su ,  Jiuyu Zhang

IPC: B02C19/18 ,  B02C23/00 ,  B02C23/02

CPC classification number: B02C19/186 ,  B02C23/02

Abstract: Provided is a use method of a gravity double-tube microwave-assisted grinding device capable of controlling ore thickness. The method comprises the following steps: step 1, estimating a metal mineral content of ores; step 2, calculating a penetration depth of the ores, step 3, determining a feeding size; step 4, determining a material thickness; step 5, determining a discharging speed Vp0; step 6, determining whether the gravity double-tube microwave-assisted grinding device capable of controlling ore thickness adopts a single-tube structure or a double-tube structure; and step 7, conveying the ores, performing heating, optimizing material parameters of the ores, and optimizing microwave parameters. By determining the feeding size of the ores and the material thickness, whether the gravity double-tube microwave-assisted grinding device capable of controlling ore thickness adopts the single-tube structure or the double-tube structure is determined, and the assisted grinding efficiency of a microwave equipment on the ores is improved.

公开(公告)号：US11773720B2

公开(公告)日：2023-10-03

申请号：US18023481

申请日：2021-04-01

Applicant: NORTHEASTERN UNIVERSITY

Inventor： Xiating Feng ,  Feng Lin ,  Chengxiang Yang ,  Jiuyu Zhang ,  Xiangxin Su ,  Shiping Li

IPC: E21C37/00 ,  E21C41/22 ,  C22B4/08 ,  E21F15/00 ,  E21B1/00

CPC classification number: E21C3/00 ,  C22B4/08 ,  E21C41/22 ,  E21F15/00

Abstract: A microwave-mechanical fluidization mining system and a mining method for metal mines. The microwave-mechanical fluidization mining system comprises a microwave pre-splitting mechanical mining system, a microwave separation system, a high-power microwave focused melting system and a goaf, wherein ore-waste rock mixtures mined by the microwave pre-splitting mechanical mining system are transported to the microwave separation system through a conveyor and an elevator on the microwave pre-splitting mechanical mining system, separated ores are transported to the high-power microwave focused melting system, and separated waste rocks are transported through a conveyor to the goaf for filling. Microwave pre-splitting mechanical mining is adopted instead of a traditional blasting mining method to increase an excavation speed and avoid the influence of blasting on the stability of surrounding rocks.

公开(公告)号：US11732582B2

公开(公告)日：2023-08-22

申请号：US17919439

申请日：2021-11-18

Applicant: Northeastern University

Inventor： Xiating Feng ,  Feng Lin ,  Chengxiang Yang ,  Jiuyu Zhang ,  Shiping Li ,  Tianyang Tong ,  Xiangxin Su

IPC: E21D9/10 ,  H05B6/80

CPC classification number: E21D9/1073 ,  H05B6/80 ,  H05B2206/044

Abstract: The invention provides a microwave plasma adaptive rock breaking device for microwave-insensitive rocks and a using method thereof, and relates to the technical field of rock breaking. The microwave plasma adaptive rock breaking device comprises a microwave system, a microwave plasma conversion system and a cutter head system. The microwave system and the microwave plasma conversion system are mounted in the cutter head system, and the microwave system is connected with the microwave plasma conversion system. Under the premise that only a microwave source is used to supply energy, the combined action of ordinary microwave irradiation and plasma irradiation in the form of high-temperature flame is realized, and a full-section hard rock tunnel boring machine is in cooperation for breaking rocks, so that the problem of microwave-induced cracks of the microwave-insensitive rocks is solved, and the application scope of a microwave rock breaking technology is enlarged.