A gas sensor impact protection device

Abstract

The application discloses a kind of gas sensor anti-impact protection device, comprising: high-strength shell assembly, including metal shell, shell inside is formed with accommodating cavity;Internal buffer protection layer, be in accommodating cavity, for wrapping electronic components of gas sensor;Fixed base, fixed in roadway roof, its long axis direction is consistent with roadway axial direction, and fixed base is provided with buffer inclined plane along long axis direction in both sides of shell, for impact force is decomposed into vertical to the component of force of installation base;Movable baffle, hinged in buffer inclined plane bottom end, can be rotated with shock wave to change windward face form;And pluggable electrical connector, for pluggable electrical connection of gas sensor and external cable.The application is effectively resisted by rigid shell and flexible buffer double protection, dynamic unloading structure and optimized installation layout, explosion impact, ensure that sensor is long-term stable operation in extreme environment, guarantee the continuity of monitoring data.

Description

Technical Field

[0001] This invention relates to the field of mine safety monitoring equipment technology, and in particular to a gas sensor shock-resistant protection device. Background Technology

[0002] In metal mining, the shock waves generated by underground blasting operations pose a serious threat to safety monitoring systems. Traditional gas sensors generally use engineering plastic housings or ordinary metal protective structures, which have the following technical drawbacks:

[0003] Insufficient mechanical properties of materials mean that ordinary stainless steel casings are prone to plastic deformation when subjected to high-intensity shock waves, leading to damage to internal sensing elements. The lack of an effective buffer design between the sensor circuit board and the housing means that the vibration energy generated by the explosive impact is directly transmitted to the precision electronic components, causing component breakage or performance drift. Electrical connections are generally made by welding. Under impact and vibration, the cable is prone to breakage due to stress concentration at the transition between the weld point and the flexible part, resulting in interruption of monitoring data. In addition, existing installation methods fail to fully consider the propagation characteristics of shock waves in roadways. The axial direction of the device often forms an angle with the axial direction of the roadway, which increases the effective area of ​​the shock wave. Furthermore, traditional fixing methods have weak shear resistance, which can easily lead to sensor displacement or detachment. Existing protective devices are all static structures, which cannot effectively cope with the transient high-pressure characteristics of blasting shock waves. At the same time, the cable protection is insufficient, and blasting debris can easily cause secondary damage.

[0004] The aforementioned defects result in a significantly shortened lifespan of traditional gas sensors in explosive environments, and the continuity of monitoring data cannot be guaranteed, failing to meet the stringent requirements of mine safety production for real-time monitoring of hazardous gases such as sulfur dioxide and carbon monoxide. Summary of the Invention

[0005] The present invention aims to at least partially solve one of the technical problems in the related art.

[0006] To achieve the above objectives, the present invention provides a gas sensor shock protection device, comprising: A high-strength housing assembly, the high-strength housing assembly comprising an outer shell made of a metallic material, the outer shell having an internal receiving cavity; An internal buffer protective layer is disposed within the receiving cavity to enclose the internal electronic components of the gas sensor; A fixed base is fixedly installed on the roof of the tunnel, and the outer shell is located on the side of the fixed base away from the roof of the tunnel; the long axis of the fixed base is consistent with the axial direction of the tunnel, and the fixed base is provided with buffer slopes on both sides of the outer shell along the long axis. A movable baffle is hinged to the bottom end of the buffer slope, and the movable baffle can rotate in the direction of impact propagation. A pluggable electrical connector is disposed in the housing for enabling a pluggable electrical connection between the gas sensor and an external cable.

[0007] This invention combines a high-strength metal shell with an internal buffer protective layer to form a dual protection system of rigid support and flexible buffering. This system can effectively resist the peak pressure of shock waves and absorb vibration energy, ensuring that the core electronic components of the sensor are not damaged in extreme blasting environments and extending the sensor's service life. By aligning the long axis of the device with the roadway axis and combining it with a dynamic unloading structure of buffer slopes and movable baffles, the dynamic response impact force of the device can be significantly reduced, effectively addressing the problem of transient high pressure from shock waves. By using pluggable electrical connectors instead of traditional welding, the vulnerability of electrical connections is eliminated. Combined with a cable protection scheme, the problem of data interruption caused by joint breakage or cable pulling is fundamentally solved, ensuring that the sensor quickly returns to normal monitoring status after blasting. Ultimately, this achieves long-term stable operation and continuous accurate monitoring of the gas sensor under metal mine blasting conditions.

[0008] Optionally, the housing is made of alloy stainless steel containing chromium and nickel, and the housing is heat-treated.

[0009] Furthermore, the internal buffer protective layer includes a potting compound layer and an elastic buffer layer. The potting compound layer covers the circuit board inside the sensor and the outer surface of key electronic components, and the elastic buffer layer is disposed between the inner wall of the housing and the circuit board.

[0010] Furthermore, the pluggable electrical connector is a crimp contact, which is configured to be electrically connected to an external cable via a crimping method.

[0011] Furthermore, there are multiple movable baffles, which are arranged at intervals along the length of the fixed base, and each movable baffle is hinged to the bottom of the fixed base.

[0012] Furthermore, the fixed base is fixedly installed in the rock mass of the roadway roof using expansion bolts.

[0013] Furthermore, it also includes a rigid protective sleeve, which is fitted over the outside of the external cable and extends from the pluggable electrical connector to the pre-embedded cable trough in the roadway wall.

[0014] Furthermore, the rigid protective sleeve is a metal corrugated pipe or a steel pipe.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a schematic diagram of a gas sensor shock-resistant protection device according to the present invention.

[0017] Explanation of reference numerals in the attached figures: 1. Outer shell; 2. Fixed base; 21. Buffer slope; 3. Movable baffle; 4. Expansion bolts. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0019] This invention proposes a gas sensor shock-resistant protection device, as described below. Figure 1 Please provide a detailed explanation.

[0020] A gas sensor shock protection device, comprising: A high-strength housing assembly, comprising a housing 1 made of metal material, wherein a receiving cavity is formed inside the housing 1; An internal buffer protective layer is set inside the receiving cavity to enclose the internal electronic components of the gas sensor; The fixed base 2 is fixedly installed on the top plate of the roadway, and the outer shell 1 is located on the side of the fixed base 2 away from the top plate of the roadway. The fixed base 2 has an installation cavity for accommodating the outer shell 1 on the side facing the outer shell 1. The long axis of the fixed base 2 is consistent with the axial direction of the roadway, and the fixed base 2 has buffer slopes 21 on both sides of the shell along the long axis. The movable baffle 3 is hinged to the bottom end of the buffer slope 21 and can rotate in the direction of impact propagation. The movable baffle 3 is configured to flip around the hinge under the action of external shock wave to change the windward shape of the gas sensor anti-shock protection device. The movable baffle 3 will not collide with the outer shell 1 when it is in the maximum flip position (i.e., in the horizontal state). A pluggable electrical connector is provided in the housing 1 for enabling a pluggable electrical connection between the gas sensor and an external cable.

[0021] This invention combines a high-strength metal outer shell 1 with an internal buffer protective layer to form a dual protection system of rigid support and flexible buffering. This system can effectively resist the peak pressure of shock waves and absorb vibration energy, ensuring that the core electronic components of the sensor are not damaged in extreme blasting environments and extending the sensor's service life. By aligning the long axis of the device with the axial direction of the roadway and combining the dynamic unloading structure of the buffer inclined surface 21 and the movable baffle 3, the dynamic response impact force of the device can be significantly reduced, effectively addressing the problem of transient high pressure from shock waves. By using pluggable electrical connectors instead of traditional welding, the vulnerability of electrical connections is eliminated. Combined with a cable protection scheme, the problem of data interruption caused by joint breakage or cable pulling is fundamentally solved, ensuring that the sensor quickly returns to normal monitoring status after blasting. Ultimately, this invention achieves long-term stable operation and continuous accurate monitoring of the gas sensor under metal mine blasting conditions.

[0022] In some embodiments, the housing 1 is made of alloy stainless steel containing chromium and nickel, and the housing 1 is heat-treated.

[0023] Specifically, the addition of chromium significantly improves the hardness and wear resistance of stainless steel, while the addition of nickel helps improve the material's toughness and impact resistance. After heat treatment, the grain structure of the alloy stainless steel is optimized, internal stress is eliminated, and the overall mechanical strength, hardness, and corrosion resistance are significantly improved. Therefore, the outer shell 1 is less prone to plastic deformation or fracture when subjected to high-intensity blast shock waves, effectively protecting the core electronic components of the gas sensor inside the cavity from direct external impact loads. In underground blasting environments in metal mines, the overpressure peak of shock waves can often reach several megapascals, and the tunnels contain acidic or humid corrosive atmospheres. Using heat-treated chromium- and nickel-alloy stainless steel to make the outer shell 1 can resist both the mechanical damage of shock waves and the chemical corrosion within the tunnels, thus ensuring the long-term structural integrity and protective effectiveness of the outer shell 1 under complex and harsh working conditions.

[0024] In some embodiments, the internal buffer layer includes a potting compound layer and an elastic buffer layer. The potting compound layer covers the circuit board inside the sensor and the outer surface of key electronic components, while the elastic buffer layer is disposed between the inner wall of the housing and the circuit board.

[0025] It should be noted that the circuit board and key electronic components inside the sensor are integrated and encapsulated using potting compound. The potting compound has excellent adhesion and insulation properties, firmly fixing the electronic components to the circuit board and preventing them from loosening or falling off in a vibrating environment. Simultaneously, the potting compound layer also acts as a sealant and moisture barrier, protecting the electronic components from the humid air and corrosive gases within the tunnel. The elastic buffer layer, made of materials with high elasticity and high damping properties, such as silicone rubber, polyurethane elastomer, or EPDM rubber, is placed between the housing and the circuit board. When the housing 1 is subjected to external impact, it converts the impact energy into elastic deformation energy and gradually dissipates it. The potting compound layer and the elastic buffer layer form a gradient protection structure. Working together, they effectively absorb and disperse the impact and vibration energy transmitted from external impacts to the cavity, preventing damage to electronic components due to instantaneous overload or cumulative fatigue, and ensuring that the core components of the sensor are protected from damage in extreme explosive environments.

[0026] In some embodiments, the pluggable electrical connector is a crimp contact configured to be electrically connected to an external cable via a crimping method.

[0027] It should be noted that traditional electrical connections commonly employ welding. Under continuous impact and vibration, stress concentration easily occurs at the weld joints, especially in the transition area between the tinned and flexible sections of the cable. Due to the abrupt change in material stiffness and cross-section, the stress concentration effect is particularly significant, and the weld joints are highly susceptible to fatigue fracture under repeated impact loads. In this embodiment, the electrical connection points abandon the traditional welding method and adopt press-fit contacts throughout. This design optimizes the stress distribution of the cable, especially at the transition between the tinned and flexible sections, structurally eliminating the risk of fracture due to vibration fatigue.

[0028] In some embodiments, the buffer ramp 21 is used to decompose at least a portion of the impact force acting on the fixed base 2 into a component force perpendicular to the mounting base direction.

[0029] It should be noted that when the long axis of the device is aligned with the axial direction of the roadway, the windward projected area of ​​the device is minimized, and the force exerted by the shock wave on the device is minimized, avoiding additional torque and stress concentration caused by lateral placement. The buffer ramp 21 is used to decompose at least a portion of the impact force acting on the fixed base 2 into a component perpendicular to the direction of the installation foundation. During roadway blasting, the shock wave propagates along the roadway axial direction. When the shock wave reaches the fixed base 2, the buffer ramp 21 first bears the impact of the shock wave. Since the buffer ramp 21 is inclined at a certain angle relative to the horizontal direction, according to the principle of force vector decomposition, the horizontally propagating impact force is decomposed into two components on the buffer ramp 21. One component is tangential to the ramp, allowing the shock wave airflow to slide along the ramp; the other component is perpendicular to the ramp, and this component is further decomposed into a horizontal component and a vertical component, with the vertical component acting on the installation foundation (i.e., the roadway roof rock mass). Due to the extremely high rigidity and stability of the installation foundation, this vertical component is effectively absorbed by the foundation, while the horizontal component is significantly weakened. In this way, the buffer slope 21 transforms part of the horizontal impact load into pressure on the foundation through geometric design, and uses the huge inertial force and constraint reaction force of the foundation to offset the impact effect, effectively reducing the horizontal impact force borne by the fixed base 2 and its connecting structure.

[0030] In some embodiments, there are multiple movable baffles 3, which are arranged at intervals along the length of the fixed base 2, and each movable baffle 3 is hinged to the bottom of the fixed base 2.

[0031] Specifically, during non-explosive periods, the movable baffle 3 hangs naturally, covering or shielding part of the outer surface of the fixed base 2 and the outer shell 1, providing a certain degree of protection. When the blast shock wave arrives, the shock wave airflow impacts the movable baffle 3 at high speed in the horizontal direction. Under the action of airflow lift and dynamic pressure, the movable baffle 3 flips upward around the hinge, changing from a hanging state to an upward-flipped state. During the flipping process of the movable baffle 3, the shape of the windward surface of the device continuously changes, and the movable baffle 3 changes from a windward state to a downwind state, significantly reducing its blocking effect on the shock wave, equivalent to removing the area of ​​the movable baffle 3 from the windward projected area; at the same time, as the movable baffle 3 flips upward, the shock wave airflow can flow past the bottom and sides of the device, forming a bypass flow, further reducing the effective windward area of ​​the device. According to the principles of fluid mechanics, the resistance experienced by an object in a fluid is proportional to its windward area. Therefore, the upward flipping action of the movable baffle 3 directly leads to a reduction in the impact load on the device. Furthermore, the flipping process of the movable baffle 3 is itself an energy dissipation process, with some of the impact energy being converted into the mechanical energy of the movable baffle 3, thereby reducing the impact energy transmitted to the fixed base 2 and the outer shell 1. The automatic flipping of the movable baffle 3 under the action of the shock wave is a passive adaptive response, requiring no external energy or control signal. It can respond immediately upon the arrival of the shock wave, and has the advantages of fast response speed and high reliability, effectively coping with the transient high-pressure characteristics of the shock wave.

[0032] It should be noted that the design of multiple movable baffles 3 makes each movable baffle 3 relatively small in size and lighter in weight, which is beneficial to improving the flipping response speed. At the same time, the multiple movable baffles 3 are arranged at intervals along the length direction, and each baffle can flip independently under the action of the shock wave, thereby adapting to the uneven distribution characteristics of the shock wave along the length direction of the device and achieving a more precise dynamic unloading effect.

[0033] In some embodiments, the fixed base 2 is fixedly installed in the rock mass of the roadway roof by expansion bolts 4, which have tensile and shear resistance. The expansion bolts 4 can withstand the pull-out force and shear force generated by the shock wave, ensuring that the device does not shift or fall off under strong impact. The anchoring depth and diameter of the expansion bolts 4 are designed according to the mechanical parameters of the roadway rock mass and the expected blasting impact load to ensure sufficient safety margin and overall stability.

[0034] In some embodiments, a rigid protective sleeve is also included. This sleeve is fitted over the external cable and extends from the pluggable electrical connector to a pre-embedded cable tray in the tunnel wall. The external cable is a crucial component of the sensor system, transmitting power and monitoring data. During blasting, high-speed flying debris and other projectiles may directly impact the cable, causing it to break or snap. The rigid protective sleeve effectively resists the impact of flying debris and the pulling of projectiles, protecting the internal cable from mechanical damage. The rigid protective sleeve extending from the pluggable electrical connector to the pre-embedded cable tray in the tunnel wall means that the entire exposed section of the cable from the sensor end to the tunnel cable tray is rigidly protected, leaving no blind spots and preventing it from being broken or snapped by flying debris or other debris.

[0035] In some embodiments, the rigid protective sleeve is a corrugated metal pipe or a steel pipe. Corrugated metal pipes have good flexibility and compressive strength, making them easy to bend and install in tunnels; steel pipes have higher impact resistance and are suitable for harsh environments with a lot of flying rocks.

[0036] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0040] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0041] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A gas sensor shock protection device, characterized in that, include: A high-strength housing assembly, the high-strength housing assembly comprising an outer shell made of a metallic material, the outer shell having an internal receiving cavity; An internal buffer protective layer is disposed within the receiving cavity to enclose the internal electronic components of the gas sensor; A fixed base is fixedly installed on the roof of the tunnel, and the outer shell is located on the side of the fixed base away from the roof of the tunnel; the long axis of the fixed base is consistent with the axial direction of the tunnel, and the fixed base is provided with buffer slopes on both sides of the outer shell along the long axis. A movable baffle is hinged to the bottom end of the buffer slope, and the movable baffle can rotate in the direction of impact propagation. A pluggable electrical connector is disposed in the housing for enabling a pluggable electrical connection between the gas sensor and an external cable.

2. The gas sensor shock protection device according to claim 1, characterized in that, The outer shell is made of alloy stainless steel containing chromium and nickel, and the outer shell is heat-treated.

3. The gas sensor shock protection device according to claim 1, characterized in that, The internal buffer layer includes a potting compound layer and an elastic buffer layer. The potting compound layer covers the circuit board inside the sensor and the outer surface of key electronic components. The elastic buffer layer is disposed between the inner wall of the housing and the circuit board.

4. The gas sensor shock protection device according to claim 1, characterized in that, The pluggable electrical connector is a crimp contact, which is configured to be electrically connected to an external cable via a crimping method.

5. The gas sensor shock protection device according to claim 1, characterized in that, The number of movable baffles is multiple, and the multiple movable baffles are arranged at intervals along the length direction of the fixed base, and each movable baffle is hinged to the bottom of the fixed base.

6. The gas sensor shock protection device according to claim 1, characterized in that, The fixed base is fixedly installed in the rock mass of the roadway roof using expansion bolts.

7. The gas sensor shock protection device according to claim 1, characterized in that, It also includes a rigid protective sleeve, which is fitted over the outside of the external cable and extends from the pluggable electrical connector to the pre-embedded cable trough in the tunnel wall.

8. The gas sensor shock protection device according to claim 7, characterized in that, The rigid protective sleeve is a metal corrugated pipe or a steel pipe.

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