A downhole blast site hazardous gas monitor

Abstract

The application discloses a kind of harmful gas monitors for use in post-blasting site, for monitoring whether the harmful gas concentration in post-blasting site meets the requirements of continuing operation. The upper half of the monitor is openable and closable, and is only opened during operation. The bottom of the monitor is provided with a lead block for fixing the monitor. The upper half of the monitor is provided with four gas sensors, a micro power supply and an explosion-proof housing. The bottom of the explosion-proof housing is provided with a torsion spring. The lower half of the monitor is closed and includes a blasting pressure sensor. When blasting occurs, the electromagnet is powered to generate magnetism, which attracts the thin iron sheet, causing the torsion spring to be stressed, opening the upper half of the monitor housing and starting the monitor. The lower half also includes a relay for amplifying the current and increasing the magnetic attraction of the electromagnet. The application is easy to operate, efficient, portable and avoids personnel casualties caused by harmful gas concentration exceeding the standard in post-blasting site.

Description

TECHNICAL FIELD

[0001] The present application belongs to the harmful gas monitor used after the underground blasting operation, and more particularly relates to the monitoring of the harmful gas concentration in the operation environment after the blasting. BACKGROUND

[0002] In the underground blasting operation, the explosive used contains a large amount of carbon, sulfur, nitrogen and other elements, and a large amount of harmful gases such as carbon monoxide, hydrogen sulfide, etc. will be generated after being detonated. According to the provisions of Article 135 of the Underground Mining Safety Regulations, the maximum allowable concentration of carbon monoxide in the mine is 0.0024%; the maximum allowable concentration of nitrogen dioxide is 0.00025%; the maximum allowable concentration of sulfur dioxide is 0.0005%; and the maximum allowable concentration of hydrogen sulfide is 0.00066%. When these harmful gases reach above the maximum allowable concentration, it will cause certain harm to the health of the underground operation personnel, and even cause death. SUMMARY

[0003] In order to overcome the insecurity of the existing portable gas monitor which needs personnel to be present for real-time monitoring, and cannot determine whether the harmful gas concentration generated after the blasting operation is over standard; and the disadvantage of the fixed gas monitor which is not convenient to move, the problem to be solved by the present application is to provide a harmful gas detection device for underground blasting site, which is simple to use and easy to operate.

[0004] In order to solve the above problems, the present application provides a harmful gas monitoring device for underground blasting site, which comprises a harmful gas monitor and a data display, wherein RS-485 type data transmission is adopted between the gas monitor and the data display.

[0005] The upper half of the harmful gas monitor of the present application comprises a carbon monoxide gas sensor 3, a hydrogen sulfide gas sensor 16, a nitrogen dioxide gas sensor 15, a sulfur dioxide gas sensor 5, a vibration-proof micro battery A4 and an openable explosion-proof housing 1. The openable explosion-proof housing 1 is divided into four parts, and each housing has a trace magnet on the top, which is attracted to each other in the closed state, having good sealing property. The four gas sensors are connected to the vibration-proof micro battery A4 through the power transmission wire C19. The blasting pressure sensor 12 and the vibration-proof micro battery A4 are connected through the data signal wire. After receiving the electric signal sent by the blasting pressure sensor 12, the vibration-proof micro battery A4 sends the working voltage to the four gas sensors, so that the four gas sensors start to work.

[0006] The lower half of the harmful gas monitor of the present application comprises a burst pressure sensor 12, an anti-vibration micro battery B 14, a relay 6, an electromagnet 20, a thin iron sheet 11, and a lead block 8. The burst pressure sensor 12 adopts a disc type installation mode, which can make the primary side measurement signal of the sensor larger. The upper half of the monitor comprises four torsion springs 2, which are welded to four corners of the thin iron sheet 11 in an openable explosion-proof shell; the anti-vibration micro battery B 14 is connected with the relay 6 through a power transmission wire B 10; the relay 6 is connected with the electromagnet 20 through a power transmission wire A 9; and the burst pressure sensor 12 is connected with the anti-vibration micro battery B 14 through a data signal wire 13. After the burst pressure sensor 12 senses the strong impact pressure caused by the blasting operation, an electric signal is transmitted to the anti-vibration micro battery B 14, a small current is enlarged through the relay 6, and the electromagnet 20 is outputted, the electromagnet 20 works, generates magnetism, and adsorbs the thin iron sheet 11; the spring 7 connected with the thin iron sheet 11 is subjected to force, pulls the torsion spring 2, makes the torsion spring 2 rotate, and drives the explosion-proof shell 1 of each part to open.

[0007] Preferably, after the burst pressure sensor senses the occurrence of the blasting operation, an electric signal is transmitted to the anti-vibration micro battery B, the electromagnet is electrified through the relay to generate strong magnetism, the torsion spring adsorbs the thin iron sheet, the thin iron sheet is subjected to force, the upper half shell of the monitor is opened, and the monitor starts to work.

[0008] The present application releases an electric signal through the sensor, drives the electromagnet to work, and rotates the torsion spring, realizes the opening of the explosion-proof shell after the blasting operation, and makes the harmful gas monitor start to work, so that the effect of safe, convenient, and convenient movement is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 It is a front view structural schematic diagram of the whole structure of the present application.

[0010] Figure 2 It is a top view structural schematic diagram of the harmful gas monitor of the present application.

[0011] Figure 3 It is a working principle diagram of the present application.

[0012] The marks in the drawing are: 1 - openable explosion-proof housing, 2 - torsion spring, 3 - carbon monoxide gas sensor, 4 - micro battery A, 5 - sulfur dioxide gas sensor, 6 - relay, 7 - carbon steel spring, 8 - lead block, 9 - power transmission wire A, 10 - power transmission wire B, 11 - thin iron sheet, 12 - explosion pressure sensor, 13 - signal transmission line, 14 - anti-vibration micro battery B, 15 - nitrogen dioxide gas sensor, 16 - hydrogen sulfide gas sensor, 17 - data transmission line, 18 - data display, 19 - power transmission wire C, 20 - electromagnet. Embodiment

[0013] The application will be further described below in conjunction with the drawings:

[0014] As shown in Figure 1 , Figure 2 , a harmful gas monitoring device for underground blasting site, comprising a harmful gas monitor and a data display. The upper half of the harmful gas monitor comprises an openable explosion-proof housing 1, and each piece of openable housing has a torsion spring 2 at the bottom; a micro battery A 4 is connected with a carbon monoxide gas sensor 3, a hydrogen sulfide gas sensor 16, a nitrogen dioxide gas sensor 15, and a sulfur dioxide gas sensor 5 through a power transmission wire C 19, and the four gas sensors are connected with a data transmission line 17 to facilitate the transmission of data signals from the sensors to the data display device 18. The lower half of the harmful gas monitor comprises a micro battery B 14, a relay 6, an electromagnet 20, a thin iron sheet 11, a carbon steel spring 7, an explosion pressure sensor 12, and a lead block 8. The micro battery B 14 and the explosion pressure sensor 12 are connected by a signal transmission line 13; the micro battery B 14 and the relay 6 are connected by a power transmission wire B 10, and the relay 6 and the electromagnet 20 are connected by a power transmission wire A 9.

[0015] In order to make the purpose and advantages of the application clearer, the application in the examples will be clearly and completely described below in conjunction with the drawings and examples of the application. Example 1

[0016] As shown in Figure 1As shown, the present application is a harmful gas monitor for blasting site. While preparing for blasting operation at the site of underground blasting operation, the harmful gas monitor of the present application is placed at 5-10 meters from the blasting point. Then, the data transmission line 17 is laid to move the data display device 18 to the personnel safety area (the blasting safety distance of the blasting site of the mining working face is not less than 50 meters; the blasting safety distance of the blasting site of the heading working face is not less than 100 meters for straight laneway and not less than 75 meters for turning laneway). Then, the blasting operation is waited. After the blasting, the blasting pressure sensor 12 in the harmful gas monitor senses the huge impact force generated by the explosion, and transmits the electric signal to the micro battery B 14 through the signal transmission line 13. The current released by the micro battery B 14 is transmitted to the relay 6 through the power transmission wire B10, and the current is amplified and transmitted to the electromagnet 20 through the power transmission wire A9. The electromagnet 20 is magnetically attracted to the thin iron sheet 11 under the action of the current, and the carbon steel spring 7 drives the torsion spring 2 to rotate and open the four explosion-proof housings 1 of the upper half of the monitor. While the blasting pressure sensor 12 transmits the electric signal to the lower half micro battery B 14, it also transmits the electric signal to the upper half micro battery A4. The carbon monoxide gas sensor 3, the hydrogen sulfide gas sensor 16, the nitrogen dioxide gas sensor 15 and the sulfur dioxide gas sensor 5 receive the working voltage output by the micro battery A4 to start monitoring the concentration of sulfur dioxide, nitrogen dioxide and carbon monoxide in the surrounding environment, and transmit the data signal to the data display device 18 through the RS-485 type transmission through the data transmission line 17. The monitoring personnel judge whether to enter the blasting site for further operation through the harmful gas concentration percentage on the data display device 18. After real-time monitoring is completed, the data transmission line 17 is arranged, and the openable explosion-proof housing 1 of the harmful gas monitor is closed.

[0017] The harmful gas monitor for blasting site of the present application can monitor the harmful gas concentration of the blasting site in real time, and the monitoring personnel do not need to enter the site in danger to monitor in real time, which ensures the safety of the underground operation personnel and the environment.

[0018] The above-described embodiments only express the preferred embodiments of the present application, which are described in detail, but cannot be understood as the limitation of the patent scope of the present application. It should be noted that, for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications, improvements and substitutions can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A harmful gas monitor for use in a downhole blasting site, comprising a data display (18), a data signal lead (17), and a openable shell (1) made of 316L stainless steel, an upper half of the shell having mounted therein four gas sensors, namely a carbon monoxide gas sensor (3), a sulfur dioxide gas sensor (5), a nitrogen dioxide gas sensor (15), and a hydrogen sulfide gas sensor (16), and a vibration-proof micro battery A (4), the openable shell (1) comprising four pieces, each piece having a torsion spring (2) at the bottom, the vibration-proof micro battery A (4) being connected to the carbon monoxide gas sensor (3), the sulfur dioxide gas sensor (5), the nitrogen dioxide gas sensor (15), and the hydrogen sulfide gas sensor (16) via a power lead C (19), the four gas sensors being connected to the data signal lead (17), a vibration-proof micro battery B (14) being connected to a relay (6) via a power lead B (10), the relay (6) being connected to an electromagnet (20) via a power lead A (9), the harmful gas monitor being capable of monitoring the concentration of harmful gases immediately after a blast and simultaneously monitoring four kinds of harmful gases, the lower half of the harmful gas monitor comprising the torsion spring (2), a blast pressure sensor (12), the vibration-proof micro battery B (14), the relay (6), the electromagnet (20), a thin iron sheet (11), and a fixed lead block (8), the blast pressure sensor (12) being capable of transmitting an electric signal to the vibration-proof micro battery B (14) after sensing the occurrence of a blasting operation, the vibration-proof micro battery B (14) being capable of causing the electromagnet (20) to generate a strong magnetism via the relay (6) to cause the torsion spring (2) to adsorb the thin iron sheet (11) to allow the thin iron sheet (11) to be stressed to open the upper half of the openable shell (1) of the monitor and to allow the monitor to start working.

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