Underground coal mine negative pressure monitoring device

Abstract

The utility model discloses an underground coal mine negative pressure monitoring device which is characterized in that a PLC (Programmable Logic Controller), an electromagnetic starter and a feed breaker are arranged on the windward side of a roadway, a methane sensor is arranged on the air return side of the roadway, and the electromagnetic starter, the methane sensor and the feed breaker are all electrically connected with the PLC; wherein the electromagnetic starter is also electrically connected with an electromagnetic water valve on the water supply pipeline; a blowout prevention slag removal box is further arranged below a slag discharge port of the capsule orifice device, and a negative pressure sensor used for detecting the negative pressure in the box body is further arranged on the blowout prevention slag removal box. By combining real-time monitoring of the blowout prevention extraction negative pressure at the drilling construction position with the automatic power-off device, the defect that the blowout prevention extraction negative pressure reduction or no-negative-pressure state cannot be found in time is perfectly overcome, and a series of gas accidents caused by the fact that blowout prevention extraction changes are not found in time in the drilling construction process are avoided; the possibility of gas accidents is reduced to the maximum extent, and the safety in the drilling construction process is guaranteed from the source.

Description

Technical Field

[0001] The utility model relates to the technical field of underground coal mine drilling, in particular to an underground coal mine negative pressure monitoring device. Background Art

[0002] In recent years, as mining in mining areas has gradually extended to deeper areas, gas pressure and content have gradually increased, and the difficulty of gas control has increased accordingly. During the drilling process, the risk of gas accidents such as warning and over-limit caused by the lack of negative pressure in the extraction system has also increased step by step. The prevention and control of negative pressure in extraction may be as important as gas prevention and control.

[0003] However, the existing equipment only monitors the negative pressure of the mine extraction system, but fails to monitor the negative pressure of the drilling construction point. Abnormal conditions such as the falling off of the negative pressure connecting pipe at the drilling construction site will cause the negative pressure of the blowout prevention extraction to decrease or even cause no negative pressure. At that time, the probability of gas accidents will greatly increase. Utility Model Content

[0004] The technical problem to be solved by the utility model is: how to provide a negative pressure detection device for a drilling construction site.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] A negative pressure monitoring device for underground coal mines, comprising a capsule orifice device installed in a tunnel, wherein the interior of the capsule orifice device passes through a drill rod, and the other side of the drill rod extends into the tunnel rock wall, and a drill rod tensioner is provided on one side of the capsule orifice device, wherein one side of the drill rod tensioner is connected to a water supply pipeline;

[0007] A PLC controller, an electromagnetic starter and a power feeder circuit breaker are provided on the upwind side of the tunnel, and a methane sensor is provided on the return air side of the tunnel. The electromagnetic starter, the methane sensor and the power feeder circuit breaker are all electrically connected to the PLC controller, wherein the electromagnetic starter is also electrically connected to the electromagnetic water valve on the water supply pipe; an anti-spraying slag removal box is also provided below the slag discharge port of the capsule orifice device, wherein a negative pressure sensor is also provided on the anti-spraying slag removal box.

[0008] The present application combines real-time monitoring of the blowout prevention and extraction negative pressure at the drilling construction site with an automatic power-off device, thereby perfectly solving the problem that the reduction of the negative pressure of the blowout prevention and extraction or the state of no negative pressure cannot be discovered in time, avoiding a series of gas accidents caused by the failure to timely discover the changes in blowout prevention and extraction during the drilling construction process, minimizing the possibility of gas accidents, and ensuring the safety of the drilling construction process from the source. When there is no negative pressure or low negative pressure in the extraction pipeline, the device can automatically cut off the power, ensuring that the drilling construction process will not cause gas accidents due to the extraction negative pressure, so as to "ensure the safety of the mine with the small safety of the drilling hole".

[0009] As a further solution of the present invention: the negative pressure sensor is electrically connected to the PLC controller.

[0010] As a further solution of the utility model: a baffle is rotatably connected to the interior of the slag discharge port, and the baffle can seal the slag discharge port. A high-pressure water injection port is also provided on the slag discharge port.

[0011] As a further solution of the utility model: the drill rod tensioner includes a capsule sealing ring, a water injection port and a rubber ring in a sleeve, wherein the inner side of the rubber ring is in close contact with the drill rod, the outer side of the rubber ring is provided with a capsule sealing ring, and a water injection port connected to the water supply pipe is opened on the capsule sealing ring.

[0012] As a further solution of the utility model: the rubber ring includes two symmetrically arranged rubber semicircles, and the two rubber semicircles wrap the drill rod from upper and lower sides.

[0013] As a further solution of the utility model: a pumping head is provided on the top of the capsule orifice device.

[0014] As a further solution of the utility model: a rubber sealing gasket is provided on the side of the capsule orifice device that contacts the rock wall.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] First, this application combines real-time monitoring of the blowout prevention and extraction negative pressure at the drilling construction site with an automatic power-off device to perfectly solve the problem that the blowout prevention and extraction negative pressure reduction or the absence of negative pressure cannot be discovered in time, avoiding a series of gas accidents caused by the failure to discover the blowout prevention and extraction changes in time during the drilling construction process, minimizing the possibility of gas accidents, and ensuring the safety of the drilling construction process from the source;

[0017] Secondly, when the negative pressure sensor detects that there is no negative pressure or the pressure is lower than the set value, the sensor sends a power-off signal to the power feeder circuit breaker, controls the electromagnetic starter to cut off the power supply of the drilling rig and the electromagnetic water valve, and after the power is off, the water inlet of the electromagnetic water valve opens, the drilling rig stops running, and high-pressure water enters the capsule orifice device through the electromagnetic water valve, compressing the capsule sealing ring to lock the drill rod. At the same time, the high-pressure water opens the baffle of the slag discharge port to seal the gas in the hole. After the orifice is sealed, the gas in the hole is extracted and depressurized using an extraction pipe, thereby preventing the occurrence of gas accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of a negative pressure monitoring device for underground coal mine tunnels according to an embodiment of the utility model;

[0019] Figure 2 This is a connection block diagram of a negative pressure monitoring device for underground coal mine tunnels according to an embodiment of the utility model;

[0020] Explanation of the accompanying reference numerals: 1. drill rod; 2. capsule orifice device; 3. extraction head; 4. electromagnetic water valve; 5. water supply pipe; 6. drilling rig; 7. high-pressure water injection port; 8. baffle; 9. slag discharge port; 10. capsule sealing ring; 11. water injection port; 12. rubber ring; 13. methane sensor. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Reference Figure 1 and Figure 2 A negative pressure monitoring device for underground coal mines includes a capsule orifice device 2, a pumping head 3, an electromagnetic water valve 4, a water supply pipeline 5, a high-pressure water injection port 7, a baffle 8, a slag discharge port 9, a capsule sealing ring 10, a water injection port 11, a rubber ring 12 and a methane sensor 13. A PLC controller, an electromagnetic starter and a feeder circuit breaker are provided on the upwind side of the tunnel, and a methane sensor 13 is provided on the return air side of the tunnel. The electromagnetic starter, the methane sensor 13, the negative pressure sensor and the feeder circuit breaker are all electrically connected to the PLC controller, wherein the electromagnetic starter is also electrically connected to the electromagnetic water valve 4 on the water supply pipeline 5.

[0023] Reference Figure 1 The capsule orifice device 2 is installed in an underground tunnel, and a drill rig 6 is provided in the tunnel, and the capsule orifice device 2 is installed on the front clamp of the drill rig 6. The drill rod on the drill rig 6 can penetrate the capsule orifice device 2 and extend into the rock wall of the tunnel to drill holes, and the capsule orifice device 2 is used to tighten the drill rod.

[0024] Furthermore, the side of the capsule orifice device 2 facing away from the drilling rig 6 is arranged toward the rock wall, and the side in contact with the rock wall is provided with a rubber sealing gasket to ensure the sealing effect; an extraction head 3 is provided on the top of the capsule orifice device 2. When the orifice is sealed, the extraction head 3 provided on the top of the capsule orifice device 2 is connected by an extraction pipe, and the gas in the hole is extracted and depressurized by the extraction head 3 and the extraction pipe, thereby preventing the occurrence of gas accidents.

[0025] Furthermore, one side of the capsule orifice device 2 is provided with a capsule sealing ring 10, a water injection port 11 and a rubber ring 12 arranged in the sleeve, wherein the inner side of the rubber ring 12 is tightly attached to the drill rod 1, and the outer side of the rubber ring 12 is provided with a capsule sealing ring 10, and a water injection port 11 connected to the water supply pipe 5 is opened on the capsule sealing ring 10, wherein the water injection port 11 is connected to the water supply pipe 5, and the water supply pipe 5 is provided with an electromagnetic water valve 4. When in use, high-pressure water can enter the capsule orifice device through the electromagnetic water valve 4, compressing the capsule sealing ring to hold the drill rod, and at the same time, the high-pressure water opens the baffle 8 of the slag discharge port 9 to block the gas in the hole. After the orifice is blocked, the gas in the hole is extracted and depressurized from the extraction head 3 using an extraction pipe, thereby preventing the occurrence of gas accidents.

[0026] Furthermore, the rubber ring 12 includes two symmetrically arranged rubber semicircles, which wrap the drill rod 1 from the upper and lower sides. When the capsule sealing ring 10 is compressed by high-pressure water, it will expand outward, and the expanded capsule sealing ring 10 will then squeeze the rubber semicircle, thereby compressing the drill rod 1 and locking the drill rod.

[0027] Reference Figure 1 An anti-spraying slag removal box is provided below the slag discharge port 9 of the capsule orifice device 2, wherein the anti-spraying slag removal box is also provided with a negative pressure sensor for detecting the negative pressure in the box body, and a baffle 8 is rotatably connected to the inside of the slag discharge port 9, which can seal the slag discharge port 9, and a high-pressure water injection port 7 is also opened on the slag discharge port 9.

[0028] The PLC controller, electromagnetic starter and power feeder breaker located on the upwind side of the tunnel can be specifically located on the drilling rig 6 or the capsule orifice device 2. The electromagnetic starter, methane sensor 13, negative pressure sensor and power feeder breaker are all electrically connected to the PLC controller, that is, intelligent control of the electromagnetic starter, methane sensor 13, negative pressure sensor and power feeder breaker can be achieved through the PLC controller.

[0029] The specific operating principles of this application are as follows:

[0030] In the present application, when the negative pressure sensor detects that there is no negative pressure or the pressure is lower than the set value, the negative pressure sensor sends a power-off signal to the power feeder circuit breaker to control the electromagnetic starter to cut off the power supply of the drilling rig 6 and the electromagnetic water valve 4. After the power is off, the water inlet of the electromagnetic water valve 4 opens, the drilling rig 6 stops running, and high-pressure water enters the capsule orifice device 2 through the electromagnetic water valve 4, compressing the capsule sealing ring 10 and the rubber ring 12 to lock the drill rod. At the same time, the high-pressure water opens the baffle of the slag discharge port 9 on the blowout prevention device to block the gas in the hole. After the orifice is blocked, the gas in the hole is extracted and depressurized from the extraction head 3 using the extraction pipeline and the tail extraction device. When the extraction negative pressure returns to a safe range, the pressure is relieved through the electromagnetic water valve 4. After the pressure is relieved, the orifice capsule and the baffle 8 are reset to the initial state, and the drilling is constructed normally.

[0031] If the negative pressure of the extraction system is abnormal, the intelligent prevention and control device can also be started by the "one-key start" button. The "one-key start" button can be set on the capsule orifice device 2 and connected to the PLC controller.

[0032] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A negative pressure monitoring device for underground coal mines, It is characterized in that It comprises a capsule orifice device (2) installed in a tunnel, the interior of the capsule orifice device (2) passes through a drill rod, and the other side of the drill rod extends into the tunnel rock wall, one side of the capsule orifice device (2) is provided with a drill rod tensioner, wherein one side of the drill rod tensioner is connected to a water supply pipeline (5); A PLC controller, an electromagnetic starter and a power feeder circuit breaker are provided on the upwind side of the lane, and a methane sensor (13) is provided on the return air side of the lane. The electromagnetic starter, the methane sensor (13) and the power feeder circuit breaker are all electrically connected to the PLC controller, wherein the electromagnetic starter is also electrically connected to the electromagnetic water valve (4) on the water supply pipeline (5); An anti-spray slag removal box is also provided below the slag discharge port (9) of the capsule orifice device (2), wherein the anti-spray slag removal box is also provided with a negative pressure sensor.

2. A negative pressure monitoring device for underground coal mines according to claim 1, Features: The negative pressure sensor is electrically connected to the PLC controller.

3. A negative pressure monitoring device for underground coal mines according to claim 1, Features: A baffle (8) is rotatably connected to the interior of the slag discharge port (9), and the baffle (8) can seal the slag discharge port (9). A high-pressure water injection port (7) is also provided on the slag discharge port (9).

4. A negative pressure monitoring device for underground coal mines according to claim 1, Features: The drill rod tensioner comprises a capsule sealing ring (10) arranged in a sleeve, a water injection port (11) and a rubber ring (12), wherein the inner side of the rubber ring (12) is in close contact with the drill rod (1), the outer side of the rubber ring (12) is provided with a capsule sealing ring (10), and the water injection port (11) connected to the water supply pipe (5) is provided on the capsule sealing ring (10).

5. A negative pressure monitoring device for underground coal mines according to claim 4, Features: The rubber ring (12) comprises two symmetrically arranged rubber semicircles, and the two rubber semicircles wrap the drill rod (1) from the upper and lower sides.

6. A negative pressure monitoring device for underground coal mines according to claim 1, Features: The top of the capsule orifice device (2) is provided with an extraction head (3).

7. A negative pressure monitoring device for underground coal mines according to claim 1, Features: A rubber sealing gasket is provided on the side of the capsule orifice device (2) that contacts the rock wall.

Images