Patent ID: 11879336
Assignee: CHINA UNIVERSITY OF MINING AND TECHNOLOGY
Field: Measurement (Instruments)
Classification: CPC E  G | IPC E  G

Claim 1:
2. The monitoring device according to claim 1, wherein the anchor strap assembly comprises long wall anchoring claws and hoop pieces;
a first end of each long wall anchoring claw of the long wall anchoring claws is connected to the outer circumference of the magnetic ring sleeve through a shaft, and a second end of the each long wall anchoring claw is a claw end for a need of being embedded into the wall of the monitoring hole in the expansion state; and
a lower end of each hoop piece of the hoop pieces is fixed to the magnetic ring sleeve, an upper end of the each hoop piece is provided with a turnover end in a shape of a horn mouth, and the turnover end is connected to the claw end of the corresponding long wall anchoring claw through a connection wire.