A device for measuring loose circle in coal mine tunnels

Abstract

The present invention discloses a device for measuring the loosening circle of a coal mine tunnel, comprising a sealing ball, a fixed ball provided at the center of the sealing ball, an alarm circuit provided on the outer surface of the fixed ball, four outer shells fixedly connected to the outer side of the sealing ball, and sealing fan blades provided on the side of the outer shell. The present invention utilizes the phenomena of deformation, collapse, and shrinkage of the tunnel side drilling hole, thereby pushing the outer shell of the device, and the outer shell pushes the spring needle to puncture the sealing ball, causing the electrolyte to flow into the interior of the sealing ball, so that the internal circuit of the sealing ball is connected, and the digital alarm sounds an alarm. The deformation of the drill hole can be obtained through the alarm number sent by the digital alarm. When the drill hole is deformed, it indicates that the device is within the range of the tunnel loosening circle. When the drill hole is not deformed, it indicates that the device is outside the tunnel loosening circle. Compared with the original measurement method, the present device is low in cost, simple in structure, easy to operate, easy to carry, accurate in results, and effectively avoids measurement errors.

Description

Technical Field

[0001] The invention belongs to the technical field of loose circle measurement, and in particular relates to a loose circle measurement device for a coal mine tunnel. Background Art

[0002] The loosening zone refers to the destruction of the equilibrium state of the original rock stress. The stress state of the surrounding rock changes from three-dimensional to approximately two-dimensional, resulting in the redistribution of surrounding rock stress and local stress concentration, causing a significant decrease in rock strength until a loose fracture zone appears in the surrounding rock. During the mining process of the working face in underground coal mines, it is often necessary to measure the loosening zone range of the working face roadway to determine the support method of the roadway. Currently, there are two main methods for measuring the loosening zone of the roadway:

[0003] Method 1: Ultrasonic rock crack detector measurement method: This method uses an ultrasonic rock crack detector to transmit ultrasonic waves to the tunnel wall and determine the extent of the loose zone based on the reflected ultrasonic waves. The main disadvantages of this method are the high cost of the equipment and the need for multiple people to coordinate their use, making it unsuitable for large-scale use.

[0004] Method 2: Drillhole Peeping Method: A borehole is drilled in the side of the tunnel, and the borehole peep camera is inserted into the borehole. The camera can observe the development of cracks in the borehole, and the scope of the loose zone in the working face tunnel can be determined based on the crack development. The main disadvantages of this method are that the borehole peep camera can easily get stuck in the collapsed borehole, causing the borehole peep camera to be scrapped and causing losses. In addition, the scope of the loose zone must be manually determined based on the cracks in the borehole, which may lead to judgment errors.

[0005] In response to the above problems, a coal mine tunnel loose circle measuring device is designed to solve them. Summary of the Invention

[0006] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and to provide a coal mine tunnel loose circle measuring device.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a coal mine tunnel loosening zone measuring device, comprising a sealing ball, a fixed ball provided at the center of the sealing ball, an alarm circuit provided on the outer surface of the fixed ball, four outer shells fixedly connected to the outer side of the sealing ball, sealing blades provided on the side of the outer shell, a hydraulic cylinder fixedly provided on the arc-shaped inner wall of the outer shell, a hydraulic column provided inside the hydraulic cylinder, the other end of the hydraulic column fixed to the fixed ball, an electrolyte provided inside the outer shell, and a spring pin fixedly provided inside the outer shell;

[0008] The alarm circuit includes a power supply, a switch, a wire, a rheostat, a digital alarm, an electrode plate A, and an electrode plate B. The two ends of the wire are provided with an electrode plate A and an electrode plate B respectively. The middle part of the wire is provided with a power supply, a switch, a rheostat, and a digital alarm in sequence.

[0009] The spring needle consists of a spring and a wall-breaking needle, and the tip of the spring needle is arranged on a side close to the sealing ball.

[0010] As a preferred technical solution of the present invention, the sealing blade is made of a pleated shrinkage plate material.

[0011] As a preferred technical solution of the present invention, a sealing ring is provided on the contact surface between the hydraulic column and the sealing ball.

[0012] As a preferred technical solution of the present invention, the digital alarm can be set with a specific alarm number.

[0013] As a preferred technical solution of the present invention, the shape of the shell is a garlic clove shape.

[0014] As a preferred technical solution of the present invention, there are four spring pins, and the four spring pins are arranged in a circular distribution.

[0015] As a preferred technical solution of the present invention, there are eight hydraulic cylinders, eight hydraulic columns, and eight sealing blades.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention utilizes the deformation, collapse, and shrinkage of the drilled hole in the tunnel side to push the outer shell of the device. The outer shell pushes the spring needle to puncture the sealing ball, causing the electrolyte to flow into the sealing ball, so that the internal circuit of the sealing ball is connected, and the digital alarm sounds an alarm. The deformation of the drilled hole can be obtained through the alarm number issued by the digital alarm. When the drilled hole is deformed, it indicates that the device is within the loose circle of the tunnel. When the drilled hole is not deformed, it indicates that the device is outside the loose circle of the tunnel.

[0018] Compared with the original measurement method, the device is low in cost, simple in structure, easy to operate, easy to carry, and has accurate results, effectively avoiding measurement errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0020] Figure 2 For the present invention Figure 1 Schematic diagram of the top view structure;

[0021] Figure 3 For the present invention Figure 1A schematic diagram of a cross-sectional three-dimensional structure;

[0022] Figure 4 For the present invention Figure 3 Schematic diagram of the top view structure;

[0023] Figure 5 It is a schematic diagram of the three-dimensional structure of the alarm circuit of the present invention.

[0024] In the figure: 1. Housing; 2. Hydraulic cylinder; 3. Hydraulic column; 4. Spring needle; 5. Electrolyte; 6. Sealing ball; 7. Fixed ball; 8. Alarm circuit; 9. Power supply; 10. Switch; 11. Wire; 12. Rheostat; 13. Digital alarm; 14. Electrode plate A; 15. Electrode plate B; 16. Sealed fan blade. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] See also Figure 1 - Figure 5 The present invention provides a technical solution for a loose circle measuring device in a coal mine tunnel: it includes a sealing ball 6, a fixed ball 7 is provided at the center of the sealing ball 6, an alarm circuit 8 is provided on the outer surface of the fixed ball 7, four outer shells 1 are fixedly connected to the outer side of the sealing ball 6, and a sealing fan blade 16 is provided on the side of the outer shell 1. A hydraulic cylinder 2 is fixedly provided on the arc-shaped inner wall of the outer shell 1, a hydraulic column 3 is provided inside the hydraulic cylinder 2, and the other end of the hydraulic column 3 is fixed on the fixed ball 7, an electrolyte 5 is provided inside the outer shell 1, and a spring needle 4 is fixed inside the outer shell 1.

[0027] In other embodiments, the alarm circuit 8 includes a power supply 9, a switch 10, a wire 11, a rheostat 12, a digital alarm 13, an electrode plate A14, and an electrode plate B15. Electrode plates A14 and B15 are respectively provided at both ends of the wire 11, and the power supply 9, switch 10, rheostat 12, and digital alarm 13 are arranged in sequence on the middle part of the wire 11.

[0028] In other embodiments, the sealing blades 16 are made of a corrugated shrinkage plate material; their function is to drive the sealing blades 16 to shrink when the housing 1 shrinks inward, and to ensure that the electrolyte 5 does not leak out.

[0029] In other embodiments, the spring needle 4 is composed of a spring and a wall-breaking needle, and the tip of the spring needle 4 is arranged on a side close to the sealing ball 6 so that the spring needle 4 can perform a wall-breaking operation on the sealing ball 6 .

[0030] In other embodiments, a sealing ring is provided on the contact surface between the hydraulic column 3 and the sealing ball 6. By providing the sealing ring, the sealing effect between the hydraulic column 3 and the sealing ball 6 is improved, and the electrolyte 5 inside the shell 1 is prevented from flowing into the sealing ball 6 in an un-extruded state.

[0031] In other embodiments, the digital alarm 13 can be set with a specific alarm number. When the alarm number is set to 1, the digital alarm alarms 1 meter, and the alarm number is i (i = 1, 2, ... n) meters. When the digital alarm 13 does not alarm, it means that the device is outside the loose range of the tunnel. The loose circle range of the coal mine tunnel can be measured by this device.

[0032] In other embodiments, the shell 1 is shaped like a garlic clove.

[0033] In other embodiments, four spring pins 4 are provided, and the four spring pins 4 are arranged in a ring-shaped distribution; by setting the position of the spring pins 4, when the inner wall of the drilled hole squeezes the shell 1, it is ensured that when the shell 1 is subjected to force, the spring pins 4 are pushed evenly.

[0034] In other embodiments, there are eight hydraulic cylinders 2 , eight hydraulic columns 3 , and eight sealing blades 16 .

[0035] Usage method: drill a hole with a depth of i (i=1, 2, ...n) meters in the side of the underground coal mine tunnel, and place the device at a position i (i=1, 2, ...n) meters inside the hole. When the tunnel produces a loose circle due to the influence of the working face mining, the surrounding rock of the tunnel side will be deformed. At this time, the hole will be deformed, collapsed, shrunk, etc. When the hole is deformed and shrunk, the shell 1 of the device will be squeezed to shrink. The shell 1 pushes the hydraulic cylinder 2 to shrink, so that the hydraulic column 3 can shrink into the hydraulic cylinder 2. At the same time, the shell 1 will also push the spring needle 4 to move toward the inside of the device, so that the spring needle 4 will puncture the sealing ball 6, causing the electrolyte 5 to follow the sealing ball 6. The small hole punctured on the ball 6 flows into the interior of the sealing ball 6. The inflow of electrolyte 5 inside the sealing ball 6 causes the alarm circuit 8 to be connected. At this time, the digital alarm 13 in the circuit alarms. The specific alarm number can be set for the digital alarm 13 (for example, when the alarm number is set to 1, the digital alarm 13 alarms 1 meter), and the alarm number is i (i=1, 2,...n) meters. When the digital alarm 13 does not alarm, it means that the device is outside the loose range of the tunnel. The loose circle range of the coal mine tunnel can be measured by this device. Compared with the original measurement method, this device is low in cost, simple in structure, easy to operate, easy to carry, accurate in results, and effectively avoids measurement errors.

[0036] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for measuring loose circles in coal mine tunnels, comprising a sealing ball (6), characterized in that: A fixed ball (7) is provided at the center of the sealing ball (6), an alarm circuit (8) is provided on the outer surface of the fixed ball (7), four housings (1) are fixedly connected to the outer side of the sealing ball (6), a sealing fan blade (16) is provided on the side of the housing (1), a hydraulic cylinder (2) is fixedly provided on the arc-shaped inner wall of the housing (1), a hydraulic column (3) is provided inside the hydraulic cylinder (2), the other end of the hydraulic column (3) is fixed to the fixed ball (7), an electrolyte (5) is provided inside the housing (1), and a spring pin (4) is fixedly provided inside the housing (1); The alarm circuit (8) comprises a power supply (9), a switch (10), a wire (11), a rheostat (12), a digital alarm (13), an electrode plate A (14), and an electrode plate B (15). The two ends of the wire (11) are provided with an electrode plate A (14) and an electrode plate B (15), respectively. The power supply (9), the switch (10), the rheostat (12), and the digital alarm (13) are arranged in sequence on the middle of the wire (11). The spring needle (4) is composed of a spring and a wall-breaking needle, and the tip of the spring needle (4) is arranged on a side close to the sealing ball (6).

2. The device for measuring loose zones in coal mine tunnels according to claim 1, characterized in that: The sealing blade (16) is made of a pleated shrinkage plate material.

3. The device for measuring loose zones in coal mine tunnels according to claim 1, characterized in that: A sealing ring is provided on the contact surface between the hydraulic column (3) and the sealing ball (6).

4. The device for measuring loose zones in coal mine tunnels according to claim 1, characterized in that: The digital alarm (13) is provided with a specific alarm number.

5. The device for measuring loose zone in coal mine tunnel according to claim 1, characterized in that: The shell (1) is in the shape of a garlic clove.

6. The device for measuring loose zones in coal mine tunnels according to claim 1, characterized in that: There are four spring pins (4), and the four spring pins (4) are arranged in a circular distribution.

7. The device for measuring loose zones in coal mine tunnels according to claim 1, characterized in that: There are eight hydraulic cylinders (2), eight hydraulic columns (3), and eight sealing blades (16).

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