Negative pressure monitoring and alarming device for gas extraction drilling construction point

Abstract

The invention belongs to the technical field of coal mine underground gas extraction, and relates to a negative pressure monitoring and alarming device for a gas extraction drilling construction point, which comprises an anti-explosion electric contact negative pressure meter, an anti-static rubber plug, a control center and an audible and visual alarm, the anti-explosion electric contact negative pressure meter is installed on a negative pressure extraction pipeline close to a construction drill hole or any connector of an orifice blowout preventer through an anti-static rubber plug and used for monitoring the negative pressure condition of the extraction pipeline in the construction process in real time. The control center is electrically connected with the explosion-proof electric contact negative pressure meter and the audible and visual alarm, and the control center is responsible for receiving an alarm signal of the explosion-proof electric contact negative pressure meter and triggering the audible and visual warning device to give an alarm. The anti-explosion electric contact negative pressure meter can be directly installed on any negative pressure extraction pipeline near an underground drilling construction point or a connector of an orifice blowout preventer, so that a monitoring device can flexibly adapt to variable underground environments, and the requirements of different construction scenes are met.

Description

Technical Field

[0001] The invention belongs to the technical field of underground gas extraction in coal mines, and relates to a negative pressure monitoring and alarm device for a gas extraction drilling construction point. Background Art

[0002] Gas extraction is a fundamental means of preventing and controlling coal and gas outbursts, and the construction quality of its extraction boreholes is crucial. With the popularization of high-power drilling equipment, gas extraction boreholes have developed from hundreds of meters in length to thousands of meters of deep directional drilling. The increase in borehole length means that the construction time will also increase. The boreholes constructed using the water slag removal process will inevitably encounter phenomena such as hole collapse, hole blockage, and poor slag removal during the long-term construction process, and it is very easy to have a sudden gas outburst. In this case, only by ensuring that there is enough extraction negative pressure at the borehole mouth can the large amount of gas that has gushed out be extracted in time to avoid gas over-limit accidents at the construction site and in the return air flow. However, in the actual construction process underground, the extraction pipeline often causes the extraction negative pressure at the borehole mouth to decrease or disappear due to water accumulation, slag blockage, or poor sealing of the pipeline interface. Affected by the underground construction environment, it is difficult for construction personnel to detect the changes in the extraction negative pressure at the first time. If blind construction continues, once the gas in the hole suddenly gushes out, it will cause a gas over-limit accident.

[0003] Existing technical solutions mainly focus on the overall monitoring of the extraction pipeline, usually adopting an integrated design, integrating the monitoring of multiple parameters such as gas concentration, flow, and negative pressure. The design is relatively complex and costly, and there are specific requirements for its installation location and pipeline interface. Existing negative pressure monitoring devices are mostly installed on the main extraction pipeline, which cannot be flexibly arranged in a complex underground environment, and it is difficult to arrange it on the extraction pipeline during drilling construction. There is also a lack of real-time underground alarm devices. On-site construction personnel cannot immediately obtain alarm information and need to rely on remote alarms from the ground monitoring center. The response delay is large, which increases the construction risk. In addition, although the traditional negative pressure gauge is simple to install and can detect the negative pressure on the extraction pipeline during drilling construction alone, it cannot record the alarm information and transmit it to the ground and the alarm function. In the case of a negative pressure alarm at the construction site, it cannot effectively help construction personnel to stop work in time and take measures. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a negative pressure monitoring and alarm device for a gas extraction drilling construction point to solve the problems raised by the background technology.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A negative pressure monitoring and alarm device for a gas extraction drilling construction site, comprising an explosion-proof electric contact negative pressure gauge, an antistatic rubber plug, a control center, and an audible and visual alarm. The explosion-proof electric contact negative pressure gauge is installed on a negative pressure extraction pipeline near a construction drilling hole or on any interface of a borehole blowout prevention device through an antistatic rubber plug, and is used to monitor the negative pressure of the extraction pipeline in real time during the construction process;

[0007] The control center is electrically connected to the explosion-proof electric contact negative pressure gauge and the sound and light alarm. The control center is responsible for receiving the alarm signal of the explosion-proof electric contact negative pressure gauge and triggering the sound and light alarm device to issue an alarm.

[0008] Furthermore, a negative pressure detection interface is provided on the negative pressure extraction pipeline close to the construction borehole to connect an anti-static rubber plug.

[0009] Furthermore, the control center is also electrically connected to the power supply of the drilling rig so as to cut off the power supply of the drilling rig and force the construction to stop after receiving the alarm signal of the explosion-proof electric contact negative pressure gauge.

[0010] Furthermore, the control center is also connected to the ground monitoring system via a signal cable to transmit the alarm record to the ground monitoring system for recording.

[0011] Furthermore, the explosion-proof sound and light warning device is installed close to the drilling rig operating table to remind on-site construction personnel of abnormal negative pressure.

[0012] The beneficial effects of the present invention are:

[0013] Compared with the existing negative pressure monitoring device, the negative pressure monitoring and alarm device for a gas extraction drilling construction point provided by the present invention has the following beneficial effects:

[0014] 1. This device greatly improves the installation flexibility and environmental adaptability. The design of installing the explosion-proof electric contact negative pressure gauge through the anti-static rubber plug allows the explosion-proof electric contact negative pressure gauge to be directly installed on any negative pressure extraction pipeline or the interface of the orifice blowout prevention device near the underground drilling construction point without changing the underground pipeline; this design not only simplifies the installation process, but also enables the monitoring device to flexibly adapt to the changing underground environment and meet the needs of different construction scenarios.

[0015] 2. This device has achieved significant improvements in safety. Through the close linkage between the control center and the explosion-proof electric contact negative pressure gauge, explosion-proof sound and light warning device and drilling rig power supply, a real-time response to negative pressure abnormalities is achieved. Once the negative pressure is lower than the set value, the control center will immediately trigger the explosion-proof sound and light warning device, and automatically disconnect the power supply of the drilling rig, forcing the construction to stop. This mechanism effectively shortens the alarm response time and ensures that construction personnel can stop work and take measures in time when the negative pressure is abnormal, thereby avoiding the risk of gas exceeding the limit due to continued construction due to insufficient negative pressure.

[0016] 3. This device performs well in cost control. By simplifying the structure of the monitoring equipment and focusing on the negative pressure monitoring and control functions at the construction site, the complexity and cost of the equipment are reduced. At the same time, the design that is easy to install and maintain also reduces the subsequent maintenance costs, making this device highly economical while maintaining high performance.

[0017] 4. This device also has powerful data recording and management functions. When the alarm is triggered, the control center will transmit the alarm record data to the ground monitoring system, so that managers can timely grasp the changes in the underground negative pressure. These data not only provide a strong basis for accident investigation, but also help managers optimize construction management and improve operation efficiency. Through this function, this device realizes comprehensive monitoring and management of underground operations, providing a strong guarantee for the safe and efficient operation of underground operations.

[0018] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0020] Figure 1 It is a structural schematic diagram of a negative pressure monitoring and alarm device used at a gas extraction drilling construction point in an embodiment.

[0021] Figure numerals: negative pressure extraction pipeline close to the construction drilling hole 1, negative pressure detection interface 2, anti-static rubber plug 3, explosion-proof electric contact negative pressure gauge 4, control center 5, explosion-proof sound and light warning device 6, ground monitoring system 7, drilling rig power supply 8. DETAILED DESCRIPTION

[0022] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0023] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0024] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0025] See also Figure 1 , which is a negative pressure monitoring and alarm device for gas extraction drilling construction points, including an explosion-proof electric contact negative pressure gauge 4 and a control center 5. Combined with the negative pressure of the coal mine extraction pipeline, an explosion-proof electric contact negative pressure gauge 4 with a range of -50kPa to 10kPa is selected, and is installed on the negative pressure detection interface 2 of the negative pressure extraction pipeline 1 close to the construction borehole or on any interface of the orifice blowout prevention device through an anti-static rubber plug 3, and is used to monitor the negative pressure of the extraction pipeline in real time during the construction process;

[0026] The control center 5 is connected to the explosion-proof electric contact negative pressure meter 4, the sound and light alarm 6 and the drilling rig power supply 8. The control center 5 is responsible for receiving the alarm signal of the explosion-proof electric contact negative pressure meter 4, triggering the sound and light alarm device 6 to issue an alarm, and directly cutting off the drilling rig power supply 8 to force the construction to stop, effectively preventing the gas over-limit accident caused by continuing the construction due to insufficient negative pressure; only when the negative pressure value of the explosion-proof electric contact negative pressure meter 4 returns to normal, the control center 5 will release the control of the drilling rig power supply 8, and resume the power supply manually to continue the construction. In addition, the control center 5 also records the alarm event and transmits the alarm record to the ground monitoring system 7.

[0027] Specifically, the explosion-proof electric contact negative pressure gauge 4 detects negative pressure through mechanical principles. An adjustable upper limit pointer is provided in the explosion-proof electric contact negative pressure gauge 4. The upper limit pointer position (i.e., alarm value) can be set according to construction requirements. When the negative pressure reaches the upper limit pointer position, the electric contact will be triggered and a signal will be output to the control center 5.

[0028] The antistatic rubber plug is used to fix the explosion-proof electric contact negative pressure gauge 4, and different specifications of antistatic rubber plugs can be selected according to the actual situation on site. By fixing the antistatic rubber plug, the explosion-proof electric contact negative pressure gauge 4 can be installed on the interface of any negative pressure extraction pipeline on the construction site, and the installation position is flexible.

[0029] The explosion-proof sound and light warning device 6 is installed near the drilling rig operating table and is electrically connected to the control center 5. When the negative pressure detected by the explosion-proof electric contact negative pressure meter 4 reaches the alarm value, the explosion-proof sound and light warning device 6 sounds an alarm to remind the on-site construction personnel that the negative pressure is abnormal and needs to be handled in time.

[0030] The ground monitoring system 7 is connected to the control center 5 via a signal cable to receive alarm records and related data, so that ground management personnel can grasp the on-site situation. If gas exceeds the limit during construction, the ground record data can also be used for later accident investigation and analysis.

[0031] The use principle of the negative pressure monitoring and alarm device for gas extraction drilling construction points is as follows:

[0032] 1. Installation: Install the explosion-proof electric contact negative pressure gauge 4 on the negative pressure detection interface 2 of the negative pressure extraction pipeline 1 close to the construction borehole or on any interface of the orifice blowout prevention device through the anti-static rubber plug 3, and electrically connect the control center 5 with the explosion-proof electric contact negative pressure gauge 4, the explosion-proof sound and light warning device 6, the drilling rig power supply 8 and the ground monitoring system 7 respectively to ensure that when the negative pressure is abnormal, the control center 5 can promptly issue an alarm and cut off the drilling rig power supply;

[0033] 2. Set the upper limit of negative pressure: According to the gas extraction standard and the underground environment, set the alarm negative pressure value by adjusting the upper limit pointer of the negative pressure gauge on the explosion-proof electric contact negative pressure gauge 4 to ensure that once the negative pressure is lower than the set value, the electric contact will automatically trigger the alarm signal;

[0034] 3. Real-time monitoring: During the drilling process, the explosion-proof electric contact negative pressure meter 4 monitors the negative pressure level in real time. If the negative pressure is lower than the set value, the electric contact triggers an alarm signal;

[0035] 4. Alarm and processing: When the negative pressure is lower than the set value, the electric contact triggers the alarm signal. After receiving the alarm signal, the control center 5 immediately controls the explosion-proof sound and light warning device 6 to sound an alarm, and cuts off the power supply of the drilling rig 8, forcing the construction personnel to stop construction, check the negative pressure extraction pipeline and negative pressure conditions, and eliminate safety hazards;

[0036] 5. Resume construction: When the negative pressure returns to normal, the electric contact triggers the alarm signal again, the control center 5 controls the explosion-proof sound and light warning device 6 to stop the alarm, and releases the control of the drilling rig power supply 8. Construction can be resumed only after the drilling rig power supply is manually supplied;

[0037] 6. Data transmission and monitoring: The control center 5 transmits the alarm records and negative pressure data to the ground monitoring system 7, and the ground management personnel can check the negative pressure status of the underground construction point at any time. The ground monitoring system saves all alarm records for subsequent analysis.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A negative pressure monitoring and alarm device for a gas extraction drilling construction point, characterized in that: It includes an explosion-proof electric contact negative pressure gauge, an anti-static rubber plug, a control center and an audible and visual alarm. The explosion-proof electric contact negative pressure gauge is installed on the negative pressure extraction pipeline close to the construction borehole or on any interface of the orifice blowout prevention device through the anti-static rubber plug, and is used to monitor the negative pressure of the extraction pipeline in real time during the construction process; The control center is electrically connected to the explosion-proof electric contact negative pressure gauge and the sound and light alarm. The control center is responsible for receiving the alarm signal of the explosion-proof electric contact negative pressure gauge and triggering the sound and light alarm device to issue an alarm.

2. The device according to claim 1, characterized in that: A negative pressure detection interface is provided on the negative pressure extraction pipeline close to the construction borehole to connect an antistatic rubber plug.

3. The device according to claim 1, characterized in that: The control center is also electrically connected to the power supply of the drilling rig so as to cut off the power supply of the drilling rig and force the construction to stop after receiving the alarm signal of the explosion-proof electric contact negative pressure gauge.

4. The device according to claim 1, characterized in that: The control center is also connected to the ground monitoring system via a signal cable to transmit the alarm records to the ground monitoring system for recording.

5. The device according to claim 1, characterized in that: The explosion-proof sound and light warning device is installed close to the drilling rig operating table to remind on-site construction personnel of abnormal negative pressure.

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