A warning device for preventing and controlling rock bursts in coal mines

Abstract

The present invention discloses a warning device for preventing and controlling rock bursts in coal mines, which comprises: a pipe column member, a drill pipe sleeve is coaxially fixed at the upper end of the pipe column member for assisting the pipe column member to drill into a coal mine borehole, and a plurality of impact warning devices are arranged in a row at one end of the pipe column member, and each of the impact warning devices is buried in the coal mine rock formation together with the pipe column member.

Description

Technical Field

[0001] The present invention belongs to the technical field of coal mine ground pressure monitoring equipment, and specifically relates to a warning device for preventing and controlling rock bursts in coal mines. Background Art

[0002] The instantaneous release of rock bursts can generate a dynamic phenomenon of sudden, sharp, and violent destruction, which is a special manifestation of mine pressure. The manifestation intensity characteristics are generally weak shock, strong shock, ejection, mine tremor, rock burst, coal shot, shock wave, elastic vibration, etc., often accompanied by phenomena such as throwing of coal and rock masses, loud noise, and air waves; it occurs suddenly and violently, with a huge shock wave force, instantly destroying roadways, coal mining faces, and equipment, and injuring personnel. Currently, the commonly used mine pressure monitoring method mainly installs stress gauges into drill holes to monitor mine pressure, but the detection limitations are large, and it is impossible to detect ground pressure in all directions in real time, resulting in difficulty in calculating early warnings in ground pressure monitoring.

[0003] Therefore, those skilled in the art have provided a warning device for preventing and controlling rock bursts in coal mines to solve the problems raised in the above background art. Summary of the Invention

[0004] To achieve the above object, the present invention provides the following technical solution: A warning device for preventing and controlling rock bursts in coal mines, which includes: a pipe column member, a drill pipe sleeve is coaxially fixed at the upper end of the pipe column member for assisting the pipe column member to drill into a coal mine drill hole, and a plurality of impact warning devices are arranged in a row at one end of the pipe column member, and each of the impact warning devices is buried in the coal mine rock formation together with the pipe column member.

[0005] Further, preferably, the impact warning device includes: an outer sleeve, an axial pressure seat is slidably arranged in the outer sleeve, a steering kit is vertically fixed in the middle of the axial pressure seat, an axial disk is coaxially fixed on the adjacent outer sleeve, a spherical shaft rod is fixed on the axial disk, one end of the spherical shaft rod is gimbal-jointed on the steering kit, a telescopic sleeve is sleeved at the connection of the spherical shaft rod, and a plurality of axial pressure detection components are also connected between the axial disk and the axial pressure seat.

[0006] Further, preferably, an inner disk frame is also fixed in the outer sleeve, a plurality of inner springs are arranged between the inner disk frame and the axial pressure disk, a plurality of stress gauges are distributed on the inner disk frame, and a telescopic adjustment rod is vertically fixed on the inner disk frame, and one end of the telescopic adjustment rod is connected to the axial pressure seat.

[0007] Further, preferably, the axial pressure detection assembly includes: a sealed shaft tube, one end of which is gimbal-jointed to the axial pressure seat, a piston member is slidably disposed within the sealed shaft tube, one end of the piston member is gimbal-jointed to the shaft disc, an air inlet is provided at one end of the sealed shaft tube, and an inner tube is vertically fixed within the piston member, and a discharge pipe is further disposed within the piston member. The middle of the inner tube is connected to the discharge pipe through a throttle pipe, and control valves are provided at both ends of the throttle pipe. A ring chamber is sleeved outside the outer sleeve, and the ring chamber is connected to the discharge pipe through a hose.

[0008] Further, preferably, air pressure bags are provided on one side of the sealed shaft tube. The air inlet end of the air pressure bag is connected to the inner tube, and the air exhaust end of the air pressure bag is connected to the discharge pipe.

[0009] Further, preferably, displacement sensors are provided within each outer sleeve.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0011] In the present invention, multiple pipe column members can be inserted at the surrounding rock of a coal mine. At this time, the impact warning devices on each pipe column member can monitor the ground pressure propagating in different directions, with high monitoring sensitivity, which is convenient for subsequent calculation and warning. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic structural diagram of the present invention Figure 1 ;

[0013] Figure 2 is a schematic structural diagram of the present invention Figure 2 ;

[0014] Figure 3 is a schematic structural diagram of the impact warning device in the present invention;

[0015] Figure 4 is a schematic structural diagram of the axial pressure detection assembly in the present invention;

[0016] In the figure: 1, pipe column member; 2, impact warning device; 21, outer sleeve; 22, axial pressure seat; 23, steering kit; 24, ball shaft rod; 25, telescopic sleeve; 26, inner spring; 27, telescopic adjusting rod; 28, shaft disc; 29, ; 3, axial pressure detection assembly; 31, sealed shaft tube; 32, piston member; 33, air inlet; 34, throttle pipe; 35, discharge pipe; 36, ring chamber; 37, air pressure bag. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] Please refer to Figure 1, in the embodiment of the present invention, a warning device for preventing and controlling rock bursts in coal mines includes: a pipe column member 1, and a drill pipe sleeve 11 is coaxially fixed at the upper end of the pipe column member 1 for assisting the pipe column member 1 to drill into a coal mine borehole. A plurality of impact warning devices 2 are arranged at one end of the pipe column member 1, and each of the impact warning devices 2 is buried in the coal mine rock formation together with the pipe column member 1.

[0018] In this embodiment, the impact warning device 2 includes: an outer sleeve 21, an axially pressing seat 22 is slidably arranged in the outer sleeve 21, a steering kit 23 is vertically fixed in the middle of the axially pressing seat 22, an axially pressing plate 28 is coaxially fixed on the adjacent outer sleeve 21, a spherical shaft rod 24 is fixed on the axially pressing plate 28, one end of the spherical shaft rod 24 is gimbal-jointed on the steering kit 23, a telescopic sleeve 25 is sleeved at the connection part of the spherical shaft rod 24, and a plurality of axially pressing detection components 3 are also connected between the axially pressing plate 28 and the axially pressing seat 22. Among them, the length range of the outer sleeve is between 0.8 m and 1.2 m, and the number of set joints of the outer sleeve should be greater than 8, so that the axially pressing detection components on each outer sleeve can monitor the deep ground pressure. Especially in the face of ground pressure impact, each outer sleeve can deflect accordingly. At this time, the axially pressing detection components can calculate and detect the stamping intensity, so as to achieve the warning effect.

[0019] As a preferred embodiment, an inner disc frame is also fixed in the outer sleeve 21, a plurality of inner springs 26 are arranged between the inner disc frame and the axially pressing plate 22, a plurality of stress sheets are distributed on the inner disc frame, and a telescopic adjusting rod 27 is vertically fixed on the inner disc frame. One end of the telescopic adjusting rod 27 is connected to the axially pressing seat 22. When the outer sleeve is inserted into the coal mine borehole, the telescopic adjusting rod is at a fixed telescopic length at this time, so that the axially pressing detection components on each outer sleeve can be in an initial state. After the pipe column member is positioned and installed, the telescopic adjusting rod can freely stretch and adjust, so as to realize the axial displacement of the outer sleeve.

[0020] In this embodiment, the axial pressure detection assembly 3 includes: a sealed shaft tube 31, one end of which is gimbal-jointed to the axial pressure seat 22. A piston member 32 is slidably disposed within the sealed shaft tube 31. One end of the piston member 32 is gimbal-jointed to the shaft disc 28. An air inlet 33 is provided at one end of the sealed shaft tube 31. An inner tube is vertically fixed within the piston member 32, and a discharge tube 35 is also disposed within the piston member 32. The middle of the inner tube is connected to the discharge tube 35 through a throttling tube 34. Control valves are provided at both ends of the throttling tube 34. A ring chamber 36 is sleeved outside the outer sleeve 21. The ring chamber 36 is connected to the discharge tube 35 through a hose 38. That is to say, each piston member slides out of the sealed shaft tube relatively during ground pressure detection. When there is rock burst in the coal mine underground, the piston member contracts under the impact, thereby exhausting the air flow in each sealed shaft tube for detection to achieve precision monitoring of rock burst.

[0021] In this embodiment, a pneumatic bladder 37 is provided on one side of each sealed shaft tube 31. The air inlet end of the pneumatic bladder 37 is connected to the inner tube, and the air outlet end of the pneumatic bladder 37 is connected to the discharge tube 35. In particular, it is preferred to control the piston member to slide out of the sealed shaft tube relatively. At this time, the control valve is opened, and the pneumatic bladder is supplied with air through the air inlet. The opening and closing pressure value of the control valve is adjusted so that the pneumatic bladder is in an inflated state when not stressed. During the occurrence of rock burst, the pneumatic bladder can perform an air exhaust function synchronously. The sum of the axial and radial pressures of the rock burst can be calculated according to the exhaust volume, and the detection accuracy is relatively high.

[0022] In this embodiment, a displacement sensor is further provided in each outer sleeve 31 to further improve the detection effect.

[0023] Specifically, a plurality of pipe column members are uniformly buried in the borehole. At this time, the telescopic adjusting rod is at a fixed length. After the pipe column members are buried, the telescopic adjusting rod can freely expand and contract. The displacement sensor records the initial positions of each impact warning device. When rock burst occurs, the displacement sensor records the end position of the displacement. At the same time, the pneumatic bladder can cooperate with the displacement of the piston member to perform pneumatic exhaust. The sum of the axial and radial pressures of the rock burst can be calculated according to the exhaust volume, and the detection accuracy is relatively high.

[0024] As described above, only the preferred specific embodiments of the present invention are provided, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A warning device for preventing and controlling rock bursts in coal mines, characterized in that: It includes a pipe string member (1), and a drill pipe sleeve (11) is coaxially fixed to the upper end of the pipe string member (1) for assisting the pipe string member (1) to drill into a coal mine borehole. A plurality of impact warning devices (2) are arranged at one end of the pipe string member (1), and each of the impact warning devices (2) is buried in the coal mine rock formation together with the pipe string member (1). The impact warning device (2) includes: an outer sleeve (21), an axially pressed seat (22) is slidably arranged in the outer sleeve (21), a steering kit (23) is vertically fixed in the middle of the axially pressed seat (22), an axially pressed plate (28) is coaxially fixed to the adjacent outer sleeve (21), a spherical shaft rod (24) is fixed to the axially pressed plate (28), one end of the spherical shaft rod (24) is gimbal-jointed to the steering kit (23), a telescopic sleeve (25) is sleeved at the connection part of the spherical shaft rod (24), and a plurality of axially pressed detection components (3) are also connected between the axially pressed plate (28) and the axially pressed seat (22). An inner disc frame is also fixed in the outer sleeve (21), a plurality of inner springs (26) are arranged between the inner disc frame and the axially pressed seat (22), a plurality of stress gauges are distributed on the inner disc frame, and a telescopic adjusting rod (27) is vertically fixed on the inner disc frame, and one end of the telescopic adjusting rod (27) is connected to the axially pressed seat (22). The axially pressed detection component (3) includes: a sealed shaft tube (31), one end of which is gimbal-jointed to the axially pressed seat (22), a piston member (32) is slidably arranged in the sealed shaft tube (31), one end of the piston member (32) is gimbal-jointed to the axially pressed plate (28), an air inlet (33) is arranged at one end of the sealed shaft tube (31), an inner tube is vertically fixed in the piston member (32), and a discharge pipe (35) is also arranged in the piston member (32). The middle of the inner tube is connected to the discharge pipe (35) through a throttling pipe (34), control valves are arranged at both ends of the throttling pipe (34), a ring chamber (36) is also sleeved outside the outer sleeve (21), and the ring chamber (36) is connected to the discharge pipe (35) through a hose (38). A pneumatic bladder (37) is arranged on one side of the sealed shaft tube (31), the air inlet end of the pneumatic bladder (37) is connected to the inner tube, and the air exhaust end of the pneumatic bladder (37) is connected to the discharge pipe (35).

2. The warning device for preventing and controlling rock bursts in coal mines according to claim 1, wherein: A displacement sensor is also arranged in each of the outer sleeves (21).

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