Explosion-proof gas monitoring marker pile for landfill excavation area

Abstract

The utility model provides a landfill excavation area explosion -proof gas monitoring mark pile, including base, the upper end surface fixed connection of base has the inner layer stake body, the upper end surface of base still is provided with the installation groove, the bottom fixed connection of installation groove has the elastic buckle, the bottom fixed connection of outer layer shell has the mounting seat, and the mounting seat inserts into the installation groove, and the both sides of outer layer shell are established to have the air inlet and the air outlet respectively, the inner layer stake body side has the monitoring probe, the inner layer stake body side establishes and has the heat dissipation hole, the utility model discloses, through setting up the double -deck structure of outer layer shell and inner layer stake body, the outer layer adopts the plastic integrated injection molding and has no metal connecting piece, reduces the risk that the shell shakes friction produces spark and causes explosion, the inner layer stake body only exposes the monitoring probe and contacts with empty interlayer gas, prevents the electric spark produced in the monitoring process and ignites the explosive gas, reduces the explosion risk of equipment in landfill.

Description

Technical Field

[0001] This utility model relates to the field of landfill gas monitoring technology, specifically to an explosion-proof gas monitoring marker post in the excavation area of ​​a landfill. Background Technology

[0002] Gas monitoring marker posts, integrating gas monitoring and area warning functions, are widely used in various gas leak risk areas. They monitor target gas concentrations in real time through built-in sensors and mark hazardous areas with prominent markings, providing data support and area warnings for safety management. In landfills, the fermentation and decomposition of landfill materials continuously produce flammable, explosive, and toxic gases such as methane and hydrogen sulfide. Furthermore, excavation operations can easily lead to gas accumulation. Therefore, gas monitoring marker posts are crucial facilities for monitoring gas concentrations, preventing explosions, and ensuring personnel safety.

[0003] A search revealed that application number CN202222620956.4 discloses a gas marker post, which uses a telescopic rod installed inside the marker post body, and an image acquisition component and a combustible gas concentration monitoring component installed on the telescopic rod to detect the combustible gas concentration within a preset range of the installation location in real time, and to collect environmental information within the preset range of the location in real time.

[0004] However, when these marker posts are in use, the alarm components, marking components, solar panels, and other components are exposed on the surface of the marker post itself. In a gas-filled environment, if these exposed components generate electrical sparks due to electrical faults, aging wiring, or in extreme cases, if internal components such as image acquisition components or combustible gas concentration monitoring components short-circuit and generate sparks, they may ignite leaked gas, leading to an explosion. Furthermore, existing landfill gas monitoring marker posts generally have safety hazards. This is because most marker posts use metal shells, and during long-term use, metal components are prone to frictional sparks due to natural wind shaking or external impacts. In a landfill environment filled with explosive gases, this poses an extremely high risk of explosion. In addition, the internal electrical structure of some marker posts is not sealed, and the electrical sparks generated by the operation of the monitoring equipment may also directly ignite the surrounding gas, causing a safety accident. Utility Model Content

[0005] The purpose of this utility model is to provide an explosion-proof gas monitoring marker post for landfill excavation areas to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An explosion-proof gas monitoring marker post for landfill excavation areas includes:

[0008] The base has an inner pile fixedly connected to its upper end face for monitoring gas in the landfill excavation area. The upper end face of the base is also provided with an installation groove, and the bottom of the installation groove is fixedly connected with an elastic buckle.

[0009] An outer shell has a mounting base fixedly connected to its bottom. The mounting base is inserted into a mounting groove, and the outer shell is installed on the base. There is an empty interlayer between the outer shell and the inner pile body. An air inlet and an air outlet are respectively opened on both sides of the outer shell.

[0010] A monitoring probe is fixedly connected to the side of the inner pile body to monitor the external gas entering through the air inlet.

[0011] The inner pile body has heat dissipation holes on its side, which are connected to the heat dissipation pipes inside the inner pile body. A first spiral return pipe is provided between the heat dissipation holes and the heat dissipation section.

[0012] Preferably, one end of the first spiral return pipe is connected to the heat dissipation part, and the other end is connected to the heat dissipation hole on the side of the inner pile body. The heat dissipation hole is located facing the air outlet on the side of the outer shell, and the path length of the first spiral return pipe is greater than 25mm.

[0013] Preferably, a one-way cover is provided on the outside of the air outlet to prevent outside air from entering the air gap. The top of the one-way cover is fixedly connected to a rotating shaft, which is rotatably connected inside the hinge.

[0014] Preferably, the air inlet is an inclined channel, with its outer inlet end lower than the outlet end on the side of the air interlayer.

[0015] Preferably, elastic buckles are fixedly connected to the bottom of both sides of the mounting groove, and protrusions protruding to both sides are fixedly connected to the sides of the elastic buckles, and buckle connecting seats are fixedly connected to the bottom.

[0016] Preferably, the lower end face of the mounting base of the outer shell has a slot, which engages with an elastic buckle to fix the outer shell.

[0017] Preferably, a sealing ring is installed on the upper end face of the outer shell mounting base. The sealing ring is interference-fitted with the inner wall of the mounting groove and the outer wall of the outer shell to seal the mounting base and the mounting groove.

[0018] Preferably, a handle is provided on both sides of the upper end face of the sealing ring, and a lifting plate is fixedly connected inside the handle.

[0019] Preferably, a sealing ring is provided at the connection between the monitoring probe and the inner pile body.

[0020] Preferably, a gas sensor, a transmission module, and an electrical control module are installed inside the inner pile body.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] This invention employs a double-layer structure consisting of an outer shell and an inner pile. The outer shell is integrally injection molded from plastic without any metal connectors, preventing sparks from metal friction at the material level. This reduces the risk of explosion caused by sparks generated from shell shaking and friction in the explosive gas environment of a landfill. The inner pile is fully sealed through welding or high-strength sealant, with only the monitoring probe exposed to contact with the gas in the air gap. The internal electrical components are completely isolated from the outside, preventing electrical sparks from igniting flammable gases during monitoring and reducing the risk of explosion of the equipment in the landfill.

[0023] This utility model achieves quick installation and disassembly of the outer shell and the base by setting a snap-fit ​​structure with elastic buckles and slots. The buckles made of elastic rubber can not only ensure the connection is sealed, but also avoid sparks generated by metal friction, thus improving explosion-proof performance.

[0024] This invention, by setting an inclined air inlet and an air outlet, prevents rainwater backflow while allowing gas to enter the hollow interlayer, reducing the risk of corrosion of the inner pile body; a one-way cover is set outside the air outlet to form a one-way airflow path, preventing external gas from entering from the air outlet. Attached Figure Description

[0025] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This is a front sectional view of the overall structure of this utility model;

[0027] Figure 3 This is a three-dimensional schematic diagram of the interference fit between the sealing ring and the base of this utility model;

[0028] Figure 4 This is a side sectional view of the handle part of the sealing ring of this utility model;

[0029] Figure 5 This is a three-dimensional schematic diagram of the sealing ring removal and air outlet of this utility model;

[0030] Figure 6 This is a three-dimensional schematic diagram showing the outer shell and sealing ring of this utility model after removal.

[0031] Figure 7 This is a three-dimensional schematic diagram of the elastic buckle of this utility model;

[0032] Figure 8 This is a schematic diagram showing the corresponding positions of the heat dissipation holes and air outlets of the inner pile body of this utility model;

[0033] Figure 9 This is a schematic diagram showing the corresponding positions of the inner pile body monitoring probe and the air inlet of this utility model;

[0034] Figure 10 This is a schematic diagram showing the corresponding positions of the first spiral return pipe, the heat dissipation part, and the one-way cover of this utility model.

[0035] In the diagram: 1. Base; 2. Outer shell; 201. Mounting seat; 202. Slot; 203. Air inlet; 204. Air outlet; 205. One-way cover; 206. Hinge; 207. Shaft; 3. Inner pile; 301. First spiral return pipe; 302. Heat dissipation part; 303. Heat dissipation hole; 304. Air intake; 305. Second spiral return pipe; 4. Mounting groove; 401. Elastic buckle; 402. Buckle connecting seat; 403. Protrusion; 5. Empty interlayer; 6. Monitoring probe; 601. Sealing ring; 7. Sealing ring; 701. Lifting plate; 702. Handle. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] Example 1:

[0038] Please see Figures 1 to 9 This utility model provides a technical solution:

[0039] Landfill gas monitoring marker posts are specialized devices that integrate gas monitoring and site marking functions. They are primarily used to monitor the gas composition and concentration in the excavated area of ​​a landfill in real time, while also serving as a warning of hazardous areas. These devices typically use a columnar structure and are buried at designated locations within the landfill. They are equipped with sensor modules that can continuously monitor landfill gases such as methane, carbon dioxide, and hydrogen sulfide. The data is transmitted wirelessly or stored locally for regulatory personnel to access. The exterior is often equipped with a conspicuous coating or reflective strips to facilitate the identification of hazardous areas. They can adapt to the complex environmental conditions of landfills and can effectively prevent safety accidents caused by the accumulation of landfill gases. They provide key data support for landfill operation and management and environmental safety assessments, and are a fundamental component of modern landfill safety monitoring systems.

[0040] An explosion-proof gas monitoring marker post for landfill excavation areas, used to monitor gases in landfill excavation areas, comprising:

[0041] The base 1 has an inner pile 3 fixedly connected to its upper end face for monitoring gas in the landfill excavation area. The upper end face of the base 1 is also provided with an installation groove 4, and the bottom of the installation groove 4 is fixedly connected with an elastic buckle 401.

[0042] The outer shell 2 has a mounting base 201 fixedly connected to its bottom. The mounting base 201 is inserted into the mounting groove 4. The outer shell 2 is installed on the base 1. There is a hollow interlayer 5 between the outer shell 2 and the inner pile body 3. An air inlet 203 and an air outlet 204 are respectively opened on both sides of the outer shell 2.

[0043] The inner pile body 3 is fixedly connected to a monitoring probe 6 on its side, which is used to monitor the external gas entering through the air inlet 203.

[0044] The inner pile body 3 has heat dissipation holes 303 on its side, and the heat dissipation holes 303 are connected to the heat dissipation part 302 inside the inner pile body 3.

[0045] Specifically, the inner pile body 3 is equipped with a gas sensor, a transmission module and an electrical control module.

[0046] The inner pile body 3 uses commercially available mature monitoring and marking pile elements, integrating gas sensors, transmission modules, and electrical control modules. Each component is modularly packaged in the shell of the inner pile body 3. The gas sensor and monitoring probe 6 are electrically connected to collect gas data in real time. The transmission module is connected to the electrical control module via a data cable, which can wirelessly transmit the monitoring data to the terminal system. The electrical control module is responsible for power supply management and signal processing. The components are electrically connected through waterproof terminals to ensure stable operation in the complex environment of the landfill.

[0047] Specifically, a sealing ring 601 is provided at the connection between the monitoring probe 6 and the inner pile body 3.

[0048] The various joints of the inner pile body 3 shell are treated by welding or high-strength sealant to ensure that the whole is sealed and leak-proof. Only the heat dissipation hole 303 is reserved as the only internal and external exchange port, which can not only ensure heat dissipation but also prevent explosive gases from entering the inner pile body 3. The sensor's monitoring probe 6 extends to the outside of the shell through the sealing ring 601. The monitoring probe 6 is located at the air inlet 203 to monitor the explosive gases entering the hollow interlayer 5.

[0049] Specifically, the heat dissipation hole 303 is positioned facing the air outlet 204 on the side of the outer shell 2. A one-way cover 205 is provided on the outside of the air outlet 204 to prevent external air from entering the air interlayer 5. The top of the one-way cover 205 is fixedly connected to the rotating shaft 207, and the rotating shaft 207 is rotatably connected inside the hinge 206.

[0050] In this embodiment, the heat dissipation part 302 of the internal components of the inner pile body 3 is connected to the heat dissipation hole 303 pipe on the inner pile body 3 as the only heat exchange channel. Preferably, a small fan of model DC5015 or suitable size (50×50×15mm) is installed in the heat dissipation part 302. The fan is electrically connected to the control module through a waterproof terminal. After starting, it can draw the heat generated by the operation of the internal components and blow it through the heat dissipation hole 303 to the air outlet 204 of the outer shell 2. The orientation of the heat dissipation hole 303 corresponds to the position of the air outlet 204 of the outer shell 2. The airflow generated when the fan in the heat dissipation part 302 is running can not only take away the internal heat, but also drive the explosive gas in the hollow interlayer 5 to be discharged from the air outlet 204.

[0051] Specifically, the small fan is automatically started and stopped by the electronic control module. The electronic control module monitors the temperature sensor data inside the inner pile body 3 in real time. When the temperature exceeds the preset threshold (such as 45℃), the small fan is automatically started to run and dissipate the internal heat through the heat dissipation hole 303. When the temperature drops to a safe range (such as below 35℃), the electronic control module controls the fan to stop running, realizing intelligent heat dissipation and avoiding continuous operation to consume power, thus ensuring energy-saving and efficient operation of the equipment.

[0052] In this embodiment, the airflow blown out from the heat dissipation hole 303 pushes the one-way cover 205 to rotate upward around the pivot 207, and the gas is discharged from the air outlet 204. When the fan stops running or the external airflow attempts to backflow, the one-way cover 205 automatically droops under its own gravity. The diameter of the one-way cover 205 is larger than the diameter of the air outlet 204. When the fan stops running, the one-way cover 205 fits against the air outlet 204 to prevent external gas from entering.

[0053] Specifically, the air inlet 203 is an inclined channel, with its outer inlet end lower than the outlet end on the side of the air interlayer 5.

[0054] In this embodiment, as Figure 2 The outer inlet end of the air inlet 203 is lower than the outlet end of the hollow interlayer 5. The vertical height difference between the inlet end and the outlet end is 5 to 10 mm, and the tilt angle of the air inlet 203 is 5° to 15° (too small an angle can easily cause rainwater backflow, and too large an angle will affect the gas inflow efficiency). This allows the outside gas to flow smoothly into the hollow interlayer 5, while preventing rainwater from backflowing into the hollow interlayer 5 and reducing the corrosion rate of the inner pile body 3.

[0055] Specifically, elastic buckles 401 are fixedly connected to the bottom of both sides of the mounting groove 4, and protrusions 403 protruding to both sides are fixedly connected to both sides of the elastic buckles 401, and buckle connecting seats 402 are fixedly connected to the bottom.

[0056] Specifically, the mounting base 201 of the outer shell 2 has a slot 202 on its lower end face. The slot 202 engages with the elastic buckle 401 to fix the outer shell 2. The elastic buckle 401 is preferably made of elastic rubber.

[0057] In this embodiment, the outer shell 2 is quickly snapped into place by the mounting base 201 and the mounting groove 4 of the base 1. When the mounting base 201 is inserted into the mounting groove 4, the elastic buckle 401 at the bottom of the mounting groove 4 is deformed by compression. When the protrusion 403 of the elastic buckle 401 passes the position of the groove 202 of the mounting base 201, the elastic buckle 401 returns to its original position, and the protrusions 403 on both sides of it are inserted into the groove 202 on the lower end face of the mounting base 201, forming a stable snap-fit ​​connection, thereby fixing the outer shell 2 to the base 1. When disassembling, simply lift the outer shell 2 upwards to deform the elastic buckle 401 and disengage it from the groove 202, and the outer shell 2 can be easily removed. The elastic buckle 401 can ensure the stability and sealing of the connection between the outer shell 2 and the base 1.

[0058] The outer shell 2 is preferably made of flame-retardant engineering plastic (such as ABS or PP + flame retardant) injection molded in one piece, so that the outer shell 2 does not have metal connectors. Compared with the existing metal shell, the metal shell may generate sparks with the base 1 or metal connectors when it sways under the natural wind in the landfill, which may ignite the explosive gas environment of the landfill. The use of plastic outer shell 2 prevents the possibility of sparks generated by friction from the material itself. The plastic material not only has good corrosion resistance and mechanical strength.

[0059] Specifically, the outer surface of the outer shell 2 is preferably coated or electroplated with a corrosion-resistant protective coating (such as polytetrafluoroethylene (PTFE) or epoxy resin coating). The thickness of this coating is controlled at 50-100 μm, which can form a dense chemical film. The PTFE coating has extremely strong resistance to acids, alkalis and organic solvents, and can effectively resist the erosion of corrosive gases and liquids such as hydrogen sulfide and organic acids in landfills. The epoxy resin coating has excellent adhesion and impermeability, and can fill the micropores on the plastic surface to prevent the penetration of corrosive media.

[0060] Specifically, a sealing ring 7 is installed on the upper end face of the mounting base 201 of the outer shell 2. The sealing ring 7 is interference-fitted with the inner wall of the mounting groove 4 and the outer wall of the outer shell 2 to seal the mounting base 201 and the mounting groove 4.

[0061] Specifically, the upper end face of the sealing ring 7 is provided with a handle 702 on both sides, and a lifting plate 701 is fixedly connected inside the handle 702.

[0062] In this embodiment, as Figure 1 and Figure 5The sealing ring 7 is installed on the mounting base 201 and has an interference fit with the inner wall of the mounting groove 4 and the outer wall of the outer shell 2 to seal and prevent external rainwater and dust from seeping into the hollow interlayer 5 from the lower mounting groove 4. The lifting plates 701 are embedded in the handles 702 on both sides of the upper end face of the sealing ring 7. The operator can lift the lifting plates 701 upward through the handles 702 to remove the sealing ring 7, and then remove the outer shell 2 to maintain the inner pile body 3.

[0063] Example 2:

[0064] Please see Figure 10 This utility model provides a technical solution that is basically the same as Embodiment 1, with slight differences:

[0065] The inner pile body 3 has a heat dissipation hole 303 on its side. The heat dissipation hole 303 is connected to the heat dissipation part 302 inside the inner pile body 3. A first spiral return pipe 301 is provided between the heat dissipation hole 303 and the heat dissipation part 302.

[0066] Specifically, one end of the first spiral return pipe 301 is connected to the heat dissipation part 302, and the other end is connected to the heat dissipation hole 303 on the side of the inner pile body 3. The heat dissipation hole 303 is located facing the air outlet 204 on the side of the outer shell 2, and the path length of the first spiral return pipe 301 is greater than 25mm.

[0067] In this embodiment, the first spiral return pipe 301 is a spiral structure with a path length greater than 25mm. The spiral pipe can slow down the airflow speed and reduce the risk of explosive gas seeping into the inner pile body 3. When dissipating heat, the airflow blown out by the fan can drive the flammable gas in the first spiral return pipe 301 to be discharged. If a low-probability explosion occurs in the empty interlayer 5, the shock wave generated by the explosion will be reflected and attenuated due to the path turning when it propagates in the spiral pipe. The volume change of the spiral structure can absorb some pressure energy, reduce the impact intensity on the inner shell, and avoid damage to the inner components due to high pressure.

[0068] Specifically, the internal negative pressure that may occur when the fan is running at high speed can be addressed by the fact that the fan is controlled by a temperature sensor to start and stop intermittently. When the fan in the heat dissipation section 302 stops running, it will actively draw in external gas in the reverse direction through the first spiral return pipe 301 to balance the negative pressure inside the inner pile body 3 caused by the fan's suction.

[0069] Example 3:

[0070] This utility model provides a technical solution that is basically the same as Embodiment 2, with the following slight differences:

[0071] The heat dissipation unit 302 is located inside the inner pile body 3 and is connected to the heat dissipation holes 303 on the side of the inner pile body 3 through the first spiral return pipe 301. The first spiral return pipe 301 serves as the air outlet 204 of the fan, guiding the internal heat to the air outlet 204 of the outer shell 2. In case of internal negative pressure when the fan is running at high speed, a second spiral return pipe 305 is provided at the front end of the heat dissipation unit 302. Its air intake 304 is located above the monitoring probe 6 and can directly draw in the gas in the empty interlayer 5. When the fan in the heat dissipation unit 302 is running, the second spiral return pipe 305 actively draws in the outside gas to prevent negative pressure and balance the negative pressure inside the inner pile body 3 caused by the fan's suction. After the gas enters the heat dissipation unit through the fan, it is directly discharged through the first spiral return pipe 301.

[0072] The structure of the second spiral return pipe 305 is the same as that of the first spiral return pipe 301. If a low-probability explosion occurs in the empty interlayer 5, the shock wave generated by the explosion will be reflected and attenuated due to the path turning when it propagates in the spiral pipe. The volume change of the spiral structure can absorb some of the pressure energy, reduce the impact intensity on the inner shell, and prevent the inner components from being damaged by high pressure.

[0073] When the fan is not running, if combustible gas (such as methane) seeps into the second spiral return pipe 305 or the first spiral return pipe 301 from the empty interlayer 5, it will be difficult to diffuse into the inner pile body 3 due to the multi-bend structure of the spiral pipe. The spiral path of the spiral return pipe significantly increases the friction resistance of the gas flow. Each bend in the pipe will cause gas molecules to collide with the pipe wall, resulting in kinetic energy loss and a change in flow direction. For methane, which is less dense than air, its natural diffusion speed in a static state is already slow. The multiple bends in the spiral pipe are equivalent to forming a barrier. After the gas molecules frequently collide with the wall in the pipe, most of the energy is consumed, and local stagnation areas are easily formed at the bends in the pipe, rather than continuously penetrating into the inner pile body. Thus, when the fan stops working, the risk of combustible gas entering the inner element area is reduced by physical barrier.

[0074] When using this utility model, first fix the base 1 to the required monitoring position in the landfill excavation area, then align the mounting base 201 of the outer shell 2 with the mounting groove 4 of the base 1 and insert it. Quick fixation is achieved by using the snap-fit ​​of the elastic buckle 401 and the groove 202. Install the sealing ring 7 for sealing, and it can be put into use.

[0075] During the monitoring process, external gas flows into the empty interlayer 5 between the outer shell 2 and the inner pile 3 through the inclined air inlet 203. The monitoring probe 6 monitors the gas composition and concentration in real time. After the data is collected by the monitoring probe 6, it is wirelessly transmitted to the terminal system through the transmission module. The small fan of the heat dissipation part 302 of the inner pile 3 starts and stops according to the instructions of the electronic control module. When it starts, the small fan directs the internal heat through the heat dissipation hole 303 to the air outlet 204 of the outer shell 2. The airflow pushes the one-way cover 205 to open, and drives the gas in the empty interlayer 5 to be discharged together.

[0076] All other parts of this utility model not described herein are the same as existing technologies, or are known technologies, or can be implemented using existing technologies, and will not be described in detail here.

[0077] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A type of explosion-proof gas monitoring marker post in a landfill excavation area, characterized in that, include: The base (1) has an inner pile (3) fixedly connected to its upper end face for monitoring the gas in the landfill excavation area. The upper end face of the base (1) is also provided with an installation groove (4), and the bottom of the installation groove (4) is fixedly connected with an elastic buckle (401). The outer shell (2) has a mounting base (201) fixedly connected to its bottom. The mounting base (201) is inserted into the mounting groove (4) to install the outer shell (2). There is a hollow interlayer (5) between the outer shell (2) and the inner pile body (3). An air inlet (203) and an air outlet (204) are respectively opened on both sides of the outer shell (2). The inner pile body (3) is fixedly connected to a monitoring probe (6) on its side, which is used to monitor the external gas entering through the air inlet (203); The inner pile body (3) has a heat dissipation hole (303) on its side. The heat dissipation hole (303) is connected to the heat dissipation part (302) inside the inner pile body (3). A first spiral return pipe (301) is provided between the heat dissipation hole (303) and the heat dissipation part (302).

2. The explosion-proof gas monitoring marker post in a landfill excavation area according to claim 1, characterized in that: One end of the first spiral return pipe (301) is connected to the heat dissipation part (302), and the other end is connected to the heat dissipation hole (303) on the side of the inner pile body (3). The heat dissipation hole (303) is located facing the air outlet (204) on the side of the outer shell (2). The path length of the first spiral return pipe (301) is greater than 25mm.

3. The explosion-proof gas monitoring marker post in a landfill excavation area according to claim 2, characterized in that: The air outlet (204) is provided with a one-way cover (205) to prevent outside air from entering the air gap (5). The top of the one-way cover (205) is fixedly connected to the rotating shaft (207), which is rotatably connected inside the hinge (206).

4. The explosion-proof gas monitoring marker post in a landfill excavation area according to claim 1, characterized in that: The air inlet (203) is an inclined channel, with its outer inlet end lower than the outlet end on the side of the air interlayer (5).

5. The explosion-proof gas monitoring marker post in a landfill excavation area according to claim 1, characterized in that: Both sides of the mounting groove (4) are fixedly connected with elastic buckles (401), and both sides of the elastic buckles (401) are fixedly connected with protrusions (403) that protrude to both sides, and the bottom is fixedly connected with a buckle connecting seat (402).

6. The explosion-proof gas monitoring marker post in a landfill excavation area according to claim 5, characterized in that: The mounting base (201) of the outer shell (2) has a slot (202) on its lower end face. The slot (202) engages with the elastic buckle (401) to fix the outer shell (2).

7. The explosion-proof gas monitoring marker post for landfill excavation areas according to claim 6, characterized in that: A sealing ring (7) is installed on the upper end face of the mounting base (201) of the outer shell (2). The sealing ring (7) is interference-fitted with the inner wall of the mounting groove (4) and the outer wall of the outer shell (2) to seal the mounting base (201) and the mounting groove (4).

8. The explosion-proof gas monitoring marker post in a landfill excavation area according to claim 7, characterized in that: The sealing ring (7) has handles (702) on both sides of its upper end face, and a lifting plate (701) is fixedly connected inside the handle (702).

9. The explosion-proof gas monitoring marker post in a landfill excavation area according to claim 1, characterized in that: A sealing ring (601) is provided at the connection between the monitoring probe (6) and the inner pile body (3).

10. The explosion-proof gas monitoring marker post in a landfill excavation area according to claim 1, characterized in that: The inner pile body (3) is equipped with a gas sensor, a transmission module and an electrical control module.

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