Monitoring device and method for dynamic development of overburden mining separated bed

Patent metadata

Field	Value
Publication number	US-11879336-B2
Application number	US-202117411061-A
Country	US
Kind code	B2
Filing date	Aug 25, 2021
Priority date	Mar 9, 2021
Publication date	Jan 23, 2024
Grant date	Jan 23, 2024

Abstract

A monitoring device and a monitoring method for dynamic development of an overburden mining separated bed are provided. The monitoring device includes a settlement magnetic ring assembly and a mounting conduit. The settlement magnetic ring assembly includes an anchor strap assembly, a magnetic induction iron ring and a magnetic ring sleeve sleeved outside the magnetic induction iron ring. The anchor strap assembly is arranged at the outer circumference of the magnetic ring sleeve and has a contraction state and an expansion state. The anchor strap assembly in the contraction state can move in a monitoring hole, and at least two fixing points at different heights are formed in the anchor strap assembly in the expansion state and the wall of the monitoring hole in a vertical direction. Two ends of the mounting conduit are connected to a drill rod and the magnetic ring sleeve respectively.

First claim

What is claimed is:

1. A monitoring device for dynamic development of an overburden mining separated bed, comprising:
a settlement magnetic ring assembly, comprising an anchor strap assembly, a magnetic induction iron ring and a magnetic ring sleeve sleeved outside the magnetic induction iron ring, wherein the anchor strap assembly is arranged at an outer circumference of the magnetic ring sleeve, the anchor strap assembly has a contraction state and an expansion state, the anchor strap assembly in the contraction state is configured to move in a monitoring hole, and at least two fixing points at different heights are formed in the anchor strap assembly in the expansion state and a wall of the monitoring hole in a vertical direction; and
a mounting conduit, wherein two ends of the mounting conduit are connected to a drill rod and the magnetic ring sleeve respectively, the anchor strap assembly is in the contraction state or the expansion state by matching the drill rod with the mounting conduit to achieve mounting and recovery of the settlement magnetic ring assembly.

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.

3. The monitoring device according to claim 2 , wherein the hoop pieces and the long wall anchoring claws are arranged in groups, and a number of the hoop pieces is at least two, and the hoop pieces are uniformly arranged on an outer circumference of an upper end of the magnetic ring sleeve.

4. The monitoring device according to claim 3 , wherein rotation spaces for the long wall anchoring claws to rotate around shafts are formed in outer sides of the hoop pieces respectively, and the rotation spaces are internally provided with elastomers respectively.

5. The monitoring device according to claim 4 , wherein each elastomer of the elastomers is an elastic rubber ring, and the elastic rubber ring is at least partially sleeved on the magnetic ring sleeve;
or the each elastomer is a limiting spring, wherein a first end of the limiting spring is connected to the corresponding long wall anchoring claw, and a second end of the limiting spring is connected to an outer circumference of an upper part of the magnetic ring sleeve or to a lower part of the corresponding hoop piece.

6. The monitoring device according to claim 2 , wherein the turnover end of each hoop piece body is provided with an antiskid structure.

7. The monitoring device according to claim 6 , wherein the antiskid structure is a rubber layer, and the rubber layer is provided with elastic bulges.

8. The monitoring device according to claim 2 , wherein recovery sleeve holes are formed in the mounting conduit, a lower end of each recovery sleeve hole of the recovery sleeve holes is of an opening structure, and an inner wall of the each recovery sleeve hole forms an accommodating space for accommodating the anchor strap assembly; and
the turnover end of the each hoop piece is configured to contract and enter the accommodating space of the corresponding recovery sleeve hole under a rotating operation of the drill rod.

9. The monitoring device according to claim 8 , wherein the inner wall of the each recovery sleeve hole is a smooth concave curved surface, the each recovery sleeve hole is fixedly arranged on an outer circumferential wall of the mounting conduit, and the each recovery sleeve hole is coaxially arranged with the mounting conduit.

10. The monitoring device according to claim 9 , wherein the mounting conduit comprises a first section and a second section, a diameter of the first section is smaller than a diameter of the second section, the first section is connected to the drill rod, and the each recovery sleeve hole is arranged on an outer circumferential wall of the first section; and
the second section is provided with helical clamping teeth, a threaded clamping groove is formed in an inner wall of the magnetic ring sleeve, and the helical clamping teeth are adapted to the threaded clamping groove.

11. The monitoring device according to claim 10 , wherein a width of the threaded clamping groove is 0.2 mm, and a width of the helical clamping teeth is 0.1 mm.

12. The monitoring device according to claim 9 , wherein the each recovery sleeve hole is made of an alloy material.

13. The monitoring device according to claim 12 , wherein a longitudinal cross section of a turnover end surface of the each hoop piece is in a beta shape with a lower part opened, the inner wall of the each recovery sleeve hole is a smooth concave corrugated curved surface, and the smooth concave corrugated curved surface is adapted to the turnover end surface of the corresponding hoop piece in the beta shape with the lower part opened.

14. The monitoring device according to claim 13 , wherein the turnover end surface of the each hoop piece has a first turnover end surface and a second turnover end surface, and an inner surface of each hoop piece body, the second turnover end surface and the first turnover end surface are arranged in a transition manner sequentially; and
the second turnover end surface is wholly of a convex structure, the antiskid structure is arranged at a lower part of the corresponding first turnover end surface, and the antiskid structure accounts for ½-⅗ of an area of the corresponding first turnover end surface.

15. A monitoring method for dynamic development of an overburden mining separated bed, used for monitoring dynamic development of a separated bed using the monitoring device of claim 1 ,
comprising the steps of:
S1, determining a mounting depth of the settlement magnetic ring assembly based on a range of a separated bed development region;
S2, probing information of a rock stratum in a mounting depth range of the settlement magnetic ring assembly, and determining a mounting position and a number of the settlement magnetic ring assembly;
S3, determining a time of the monitoring hole starting to drill based on information of coal mining footage of a working face and a drilling rate of the monitoring hole, and completing construction of the monitoring hole; and
S4, mounting the settlement magnetic ring assembly at a position with a preset depth in the monitoring hole, using a layered settlement monitoring system to monitor the dynamic development of the separated bed, and obtaining a rock stratum settlement amount and a separated bed development height.

16. The monitoring method according to claim 15 , wherein mounting the monitoring device comprises the steps of:
S41, mounting the anchor strap assembly on the drill rod through the mounting conduit, and using the drill rod to put the settlement magnetic ring assembly in the contraction state down at the position with the preset depth in the monitoring hole;
S42, after enabling the drill rod to drop down to enable the anchor strap assembly in the contraction state to be put at the position with the preset depth, lifting up the drill rod to drive the mounting condu

Assignees

• Univ China Mining

Inventors

• Li Wenping
• Chen Weichi
• Wang Qiqing
• He Jianghui
• Qiao Wei
• Li Liangning
• Yang Yuru

Classifications

• E21C39/00 Primary

  Devices for testing in situ the hardness or other properties of minerals, e.g. for giving information as to the selection of suitable mining tools · CPC title

• E21B49/00

  Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells · CPC title

• G01N33/24 Primary

  Earth materials (G01N33/42 takes precedence) · CPC title