Gas detection device for grain piles

Abstract

To provide a gas detection device for comprehensive and accurate collection of gases within grain piles and grain warehouses. [Solution] The gas detection device for grain piles includes branch hoses, rigid tubes, micro gas shut-off valves, a main hose, a central control unit, an extraction pump, and a gas analyzer. Multiple rigid tubes are arranged vertically, and the top ends of each rigid tube are connected to branch hoses. Multiple branch hoses are connected to a main hose, and the rigid tubes are provided with intake ports. The micro gas shut-off valve includes a shut-off valve housing, which includes an intermediate square box and a rotating plate. A first vent array is provided on one side of the circular bottom, and a second vent array is provided on one side of the intermediate square box, with the second vent array corresponding to the position of the intake port. The rotating plate is connected to a drive motor via a pivot shaft, which drives and rotates the rotating plate. The central control unit is connected to the drive motor, the extraction pump, and the gas analyzer, respectively.

Description

Technical Field

[0001] The present invention belongs to the field of gas detection for grain piles, and particularly belongs to a gas detection device for grain piles.

Background Art

[0002] The gas components and concentrations in a grain warehouse have an important impact on grain storage. High-concentration oxygen promotes the respiration of grains, causing a large amount of consumption of organic substances in the grains, resulting in heat generation and mold in the grains. A low-oxygen environment can suppress the respiration of grains and the growth of pests and microorganisms. Gas adjustment and control is a commonly used technology in grain warehouses, which can achieve the purpose of delaying the deterioration of grains and suppressing the harm of insects and molds. Commonly used gas adjustment and control gases are carbon dioxide and nitrogen gas. Therefore, the detection of silo gas is very important and necessary. Through gas detection, the grain storage state can be detected, the activity status of pests and microorganisms can be judged, and data basis and other effects for gas adjustment and control and circulation fumigation can be provided to ensure the safety of grain storage. Currently, there is no relatively mature and complete gas detection device for grain piles in China. Usually, manual detection is often adopted to detect the gas in the grain warehouse. The process is complicated and inefficient, and it is difficult to detect the gas at each part inside the grain pile. This is exactly the biggest problem faced by the gas detection device for grain piles in China. Therefore, it is necessary to design a gas detection device for grain piles with a high degree of automation to save labor costs and efficiently detect the gas in the grain pile.

Summary of the Invention

Problems to be Solved by the Invention

[0003] Regarding the above technical problems, the present invention is advantageous in realizing the comprehensive and accurate collection of the gas in the grain pile and the grain warehouse, can meet the daily gas detection work in the grain warehouse, has a high degree of process automation, is flexible and convenient, can be remotely operated and is easy to operate, and provides a gas detection device for grain piles.

[0004] The description of these objectives does not preclude the existence of other objectives. One aspect of the present invention does not need to achieve all of the above-mentioned objectives. Other objectives can be derived from the description in the specification, drawings, and claims. [Means for solving the problem]

[0005] The present invention achieves the above technical objectives by the following technical means.

[0006] A gas detection device for grain piles, comprising branch hoses, rigid tubes, micro gas shut-off valves, main hoses, a central control unit, an extraction pump, and a gas analyzer, Multiple rigid tubes are arranged vertically, the top end of each rigid tube is connected to a branch hose, the multiple branch hoses are connected to a main hose, the rigid tubes are provided with air intakes, and the micro gas on / off valves are located inside the rigid tubes and are on the same horizontal plane as the central axis of the corresponding air intake. The micro gas shut-off valve includes a shut-off valve housing, which includes an intermediate square box and a rotating plate, the upper and lower ends of the intermediate square box are open, the upper opening is provided with a circular lid, the lower opening is provided with a circular bottom, one side of the circular bottom is provided with a first ventilation hole array, one side of the intermediate square box is provided with a second ventilation hole array, the second ventilation hole array corresponds to the position of the intake port, the rotating plate is provided inside the intermediate square box, and the rotating plate has a pivot axis It is connected to a drive motor via a drive motor, which drives and rotates a rotating plate, and when the rotating plate shields the first vent array, it blocks the airflow passages at the bottom and top of the rigid tube, and at the same time releases shielding from the second vent array, forming a continuous airflow passage between the intake and the top of the rigid tube, and when the rotating plate shields the second vent array, it blocks the airflow passage at the top of the rigid tube, and at the same time releases shielding from the first vent array, forming a continuous airflow passage between the bottom and top of the rigid tube, The inlet of the extraction pump is connected to the outlet of the main hose, and the outlet of the extraction pump is connected to the gas analyzer. The central control unit is connected to the drive motor, the extraction pump, and the gas analyzer, respectively.

[0007] In the above embodiment, the rigid pipe includes a plurality of rigid pipe sections that are detachably connected.

[0008] In the above embodiment, a safety valve is further included, wherein one end of the main hose extends from the grain warehouse and is connected via a fitting to a header pipe outside the grain warehouse, and the safety valve is provided in the header pipe.

[0009] In the above embodiment, the branch hoses and main hoses are installed above the grain surface in the grain warehouse, employing a five-point layout, where the main hose is located at an intermediate position above the grain surface in the grain warehouse, and branch hoses are provided at each of the four corners above the grain surface in the grain warehouse. The branch hoses and main hoses cover different areas of the surface of the grain piles, ensuring the representativeness of the gas sample.

[0010] Furthermore, the hose is provided with an air intake port, and the micro gas on / off valve is located inside the hose and is on the same horizontal plane as the central axis of the corresponding air intake port.

[0011] In the above embodiment, the rigid pipe is installed vertically below the grain level in the grain warehouse.

[0012] In the above embodiment, the drive motor for each of the micro gas on / off valves is connected to the central control unit.

[0013] Furthermore, each of the drive motors for the micro gas on / off valves is provided with an identification number, and the central control unit controls the operation of each drive motor via a communication module.

[0014] The above embodiment further includes a power management module connected to each drive motor.

[0015] In the above embodiment, the gas analyzer is a gas analysis system or a portable detector. [Effects of the Invention]

[0016] Compared to the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. The present invention combines a hose and a rigid pipe to form a structure that combines a rigid pipe and a flexible pipe. Above the grain pile, a hose is used, and the position of the hose can be changed as needed to adjust the spatial position of the gas detection point below in the lateral direction. Below the grain pile, a rigid pipe is used, and the position of the gas detection point can be changed as needed to adjust the vertical direction to change the depth to which the rigid pipe is inserted into the grain pile, which is advantageous in achieving comprehensive and accurate collection of gas within the grain pile and grain warehouse. The five-point layout of the hose and the section design of the rigid pipe enable adjustment of the gas detection point, which is advantageous for detection at different depths and positions in the grain pile, and can more realistically reflect the gas conditions inside the grain pile.

[0018] 2. The rigid pipe of the present invention adopts a design in which single pipe sections are connected to each other, providing flexible connections and easy installation and removal. When gas detection is required after grain enters the warehouse, the pipe can be installed, and the number of pipes can be arbitrarily adjusted as needed, allowing for flexible control of the number of gas detection points. After the grain leaves the warehouse, the pipe can be disassembled into multiple sections for storage, avoiding space occupancy in the grain warehouse and achieving the objective of reducing pipe maintenance costs.

[0019] 3. A micro gas on-off valve may be provided inside both the rigid pipe and the hose of the present invention. The drive motors of each of the micro gas on-off valves are respectively connected to the central control unit. The central control unit remotely controls the drive motor of the designated micro gas on-off valve to control the rotation plate to rotate, thereby realizing the opening and closing switching of the double air path and realizing the individual suction of gas from each air inlet. This remote automation control function can greatly reduce the manual workload, improve the efficiency and accuracy of gas detection, quickly detect abnormal gas changes in the grain pile, and strongly guarantee the storage safety of the grain warehouse.

[0020] 4. The external design of the grain warehouse of the present invention is reasonable. The safety valve and the air extraction pump provided on the main hose ensure the safety and stability during the transportation of the gas sample.

[0021] Note that the description of these effects does not prevent the existence of other effects. One aspect of the present invention does not necessarily have all of the above-mentioned effects. Other effects can be clearly extracted from the descriptions in the specification, drawings, claims, etc.

Brief Description of the Drawings

[0022] [Figure 1] It is a schematic installation diagram inside the rigid pipe section of the micro gas on-off valve according to an embodiment of the present invention. Figure 1(a) is the rigid pipe section, and Figure 1(b) is an enlarged schematic diagram of location A in Figure 1(a). [Figure 2] It is a schematic diagram of the pipe structure arrangement inside the grain warehouse of the gas detection device for the grain pile according to an embodiment of the present invention. Figure 2(a) is the front view of the pipe structure, Figure 2(b) is the perspective view of the pipe structure, and Figure 2(c) is an enlarged schematic diagram of location C in Figure 2(b). [Figure 3] It is a schematic diagram of the structure in which screw ports are provided at both ends of the rigid pipe section according to an embodiment of the present invention. [Figure 4]It is a schematic structural view of a micro gas on-off valve according to an embodiment of the present invention. FIG. 4(a) is a schematic bottom view of the micro gas on-off valve, FIG. 4(b) is a perspective structural view 1 of the micro gas on-off valve, FIG. 4(c) is a perspective structural view 2 of the micro gas on-off valve, and FIG. 4(d) is a plan view of the micro gas on-off valve. [Figure 5] It is a schematic structural view of a connection joint member according to an embodiment of the present invention.

Embodiments for Carrying out the Invention

[0023] Hereinafter, embodiments of the present invention will be described in detail. Examples of the above embodiments are shown in the drawings, and the same or similar reference numerals from beginning to end represent the same or similar elements, or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are for explaining the present invention and should not be understood as limiting the present invention.

[0024] In the description of the present invention, the orientation or positional relationship indicated by terms such as "center", "vertical", "horizontal", "length", "width", "thickness", "front", "rear", "left", "right", "up", "down", "axial direction", "radial direction", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is merely for facilitating the description of the present invention and simplifying the description of the present invention, and does not indicate or imply that the indicated device or element must have a specific orientation and be structured and operated in a specific orientation, and should not be understood as a limitation to the present invention. Furthermore, the terms "first" and "second" are used only for the purpose of explanation and should not be understood as indicating relative importance, implying, or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more features. In the description of the present invention, "plurality" means two or more unless specifically limited.

[0025] In the present invention, unless otherwise specifically defined and limited, terms such as "attachment," "connection," "linking," and "fixing" should be understood in a broad sense, and may include, for example, a fixed connection, a removable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, or an internal connection between two elements. Those skilled in the art will be able to understand the specific meaning of the above terms in the present invention depending on the specific circumstances.

[0026] As shown in Figures 1-5, the gas detection device for the grain pile includes a hose, rigid tube 8, micro gas shut-off valve 9, central control unit, extraction pump and gas analyzer. The hose includes branch hoses 7 and a main hose 11. Multiple rigid pipes 8 are arranged vertically, the top ends of each rigid pipe 8 are connected to the branch hoses 7, and the multiple branch hoses 7 are connected to the main hose 11. The rigid pipes 8 are provided with air intake ports 5, and the micro gas on / off valves 9 are located inside the rigid pipes 8 and lie on the same horizontal plane as the central axis of the corresponding air intake ports 5.

[0027] As shown in Figures 1 and 4(a) to 4(d), the micro gas shut-off valve 9 includes a shut-off valve housing 4, which includes an intermediate rectangular box 402 and a rotating plate 404. The upper and lower ends of the intermediate rectangular box 402 are open, with a circular lid 401 provided at the upper opening and a circular bottom 403 at the lower opening. A first ventilation hole array 1 is provided on one side of the circular bottom 403, and a second ventilation hole array 2 is provided on one side of the intermediate rectangular box 402, with the second ventilation hole array 2 corresponding to the position of the intake port 5. The circular lid 401 and the circular bottom 403 are for blocking the flow of gas. The intermediate rectangular box 402 is the shut-off valve body, and a rotating plate 404 and a drive motor are provided inside the intermediate rectangular box 402. The rotating plate 404 is connected to the drive motor via a pivot shaft, and the drive motor drives the rotating plate 404 to rotate. When the rotating plate 404 rotates 90 degrees counterclockwise to shield the first vent array 1, it blocks the airflow passages at the bottom and top of the rigid pipe 8, simultaneously releasing the shielding from the second vent array 2 and forming a continuous airflow passage between the intake port 5 and the top of the rigid pipe 8. When the rotating plate 404 rotates 90 degrees clockwise to shield the second vent array 2, it blocks the airflow passages at the top of the rigid pipe 8, simultaneously releasing the shielding from the first vent array 1 and forming a continuous airflow passage between the bottom and top of the rigid pipe 8. The inlet of the extraction pump is connected to the outlet of the main hose 11, the outlet of the extraction pump is connected to the gas analyzer, and the central control unit is connected to the drive motor, the extraction pump, and the gas analyzer, respectively. The central control unit remotely controls the drive motor of the designated micro gas on / off valve 9, thereby controlling and rotating the rotating plate 404 to enable switching between the opening and closing of the dual air passages, and allowing gas to be drawn in individually from each intake port 5. This remote automated control function significantly reduces the workload of manual labor, improves the efficiency and accuracy of gas detection, allows for the rapid detection of abnormal gas changes within the grain storage area, and strongly ensures the storage safety of the grain warehouse.

[0028] The rotating plate 404 is connected to the bottom of the intermediate square box 402 via a hinge structure and is used to selectively change the gas flow path.

[0029] The rigid tube 8 includes multiple rigid tube sections 3 that are detachably connected and can be quickly assembled and disassembled for storage as needed.

[0030] In one specific embodiment of the present invention, the rigid pipe section 3 is 1.5 meters long, and both ends of the rigid pipe section 3 are threaded, and multiple rigid pipe sections 3 are connected by threads, allowing for flexible removal and installation.

[0031] The gas detection device for the grain storage area further includes a safety valve. One end of the main hose 11 extends from the grain storage area and is connected via a fitting to a header pipe outside the grain storage area. The safety valve is provided in the header pipe to release excess pressure. An extraction pump is provided in the header pipe and is used to draw gas samples into a gas analyzer. Furthermore, the set pressure of the safety valve is 0.1 MPa, and if the pressure inside the pipe exceeds this value, the safety valve automatically opens to release excess pressure and ensure the safety of the device operation. Furthermore, the extraction rate of the extraction pump is 10 L / min, which can stably extract gas samples from inside the grain storage area into a gas analysis system or portable detector, ensuring the continuity and accuracy of detection.

[0032] The hose layout will adopt a five-point layout or be flexibly changed as needed.

[0033] The branch hoses 7 and main hose 11 are installed above the grain surface in the grain warehouse, employing a five-point layout. Specifically, the main hose 11 is located at an intermediate position above the grain surface in the grain warehouse, and branch hoses 7 are provided at each of the four corners above the grain surface in the grain warehouse. The branch hoses 7 and main hose 11 cover different areas of the grain pile surface, ensuring representativeness of the gas sample. The hoses are provided with intake ports 5, and the micro gas on / off valves 9 are located inside the hoses and lie on the same horizontal plane as the central axis of the corresponding intake port 5. The position of the intake port 5 can be adjusted as a gas detection point as needed.

[0034] Below the grain level of the grain warehouse, the structures are connected by rigid pipes 8. In the case of a five-point connection type, five rigid pipes 8 are used, each rigid pipe 8 is divided into four sections, and each rigid pipe 8 employs a design that combines single modules. The rigid pipe sections 3 are connected with standard threads and are flexibly detachable. An air intake 5 is provided in the middle of each rigid pipe section 3, and the position of the air intake 5 is the position of the gas detection point.

[0035] Figure 2 shows a rational layout configuration for a gas detection device for grain piles within a single-story warehouse.

[0036] The branch hose 7 and the main hose 11 are connected via a joint above the grain surface. The hose layout is a five-point configuration, i.e., a square + central configuration. A grain warehouse gas detection point 6 is provided in the middle of the main hose 11, and an intake port 5 is provided at the grain warehouse gas detection point 6. A micro gas shut-off valve 9 is located inside the hose and is on the same horizontal plane as the central axis of the corresponding intake port 5. The grain warehouse gas detection point 6 detects the grain warehouse gas by directly drawing it in through the main hose 11 and is located above the grain surface. All other gas detection points are located below the grain surface, i.e., located in the rigid pipe 8.

[0037] The rigid pipe 8 and the branch hose 7 are connected via a connecting joint member 10. The rigid pipe 8 is located below the grain level. The rigid pipe section 3 is shown in Figures 1(a) and 1(b), and the connecting joint member 10 is shown in Figure 5. Micro gas on / off valves 9 are provided inside each of the rigid pipes 8. A central control unit installed remotely controls the opening and closing of the micro gas on / off valves 9, enabling individual gas suction from each intake port 5.

[0038] The hose and rigid pipe 8 are combined to form a structure combining rigid and flexible pipes. The hose is used to cover the surface of the grain pile and to flexibly adjust its position to laterally adjust the spatial position of the gas detection point. The rigid pipe 8 penetrates deep into the grain pile and adjusts the position of the gas detection point vertically by changing the insertion depth, thereby achieving comprehensive gas collection at different depths and locations in the grain pile. The rigid pipe 8 and hose can be quickly installed when in use and removed and stored when idle, reducing the occupied space and maintenance costs.

[0039] Preferably, the material of the hose is food-grade silica gel, which has good flexibility and aging resistance, facilitates installation and maintenance, and at the same time ensures compatibility between grain piles and grain warehouses.

[0040] Preferably, the rigid tube is made of stainless steel, which has good corrosion resistance and airtightness, ensuring stability and accuracy during transport of gas samples.

[0041] As shown in Figure 3, the rigid pipe 8 is installed vertically below the grain level in the grain warehouse and employs a design that combines single modules. Preferably, the length of the rigid pipe section 3 is 1.5 meters, and the rigid pipe sections 3 are connected via standard threads, allowing for flexible removal and installation.

[0042] Each of the drive motors for the micro gas on / off valves 9 is provided with an identification number, and the central control unit controls the operation of each drive motor via a communication module.

[0043] The gas detection device for the grain pile further includes a power management module, each connected to a drive motor.

[0044] The gas analyzer is a gas analysis system or portable detector, and is equipped with a multi-functional combined gas detector or a single gas detector for detecting gas samples.

[0045] The position of the air intake port 5 is the position of the gas detection point, and the position of the air intake port 5 in the rigid tube 8 can be adjusted as needed.

[0046] In one specific embodiment of the present invention, the first vent array 1 is located on the left half of the circular bottom 403 and its role is to allow gas below the micro gas on / off valve 9 to flow into the intermediate square box 402. The second vent array 2 is located on the right side of the intermediate square box 402 and its role is to allow gas drawn into the intake port 5 to flow into the intermediate square box 402. The rotating plate 404 is connected to the middle of the circular bottom 403 via a pivot axis and its role is to selectively change the gas inflow on the left or right side by rotating left or right, thereby enabling switching of the dual air passages, controlling the gas to flow into the rigid tube 8 and then transport it.

[0047] In one specific embodiment of the present invention, the drive motor is mounted on the right side of the bottom of the intermediate square box 402 and its role is to operate the rotation axis by the central control unit to change the position of the rotating plate 404. When the rotating plate 404 is in the left position, it shields the first vent array 1, blocking the airflow passages at the bottom and top of the rigid pipe 8, and at the same time releases the shielding to the second vent array 2, forming a continuous airflow passage between the intake port 5 and the top of the rigid pipe 8.

[0048] When the rotating plate 404 is positioned on the right side, it shields the second ventilation array 2, blocking the airflow passage between the intake port 5 and the upper part of the rigid tube 8, while simultaneously releasing the shielding from the first ventilation array 1 and forming a continuous airflow passage between the lower and upper parts of the rigid tube 8.

[0049] During the operation of the gas detection device for the grain pile, the rigid tube 8 is installed vertically below the grain surface in the grain warehouse and extends along the depth direction of the grain warehouse, with each intake port 5 of the rigid tube 8 facing into the grain pile and collecting gas samples at different depths.

[0050] The branch hoses 7 and main hoses 11 are installed above the grain surface in the grain warehouse, employing a five-point layout. Specifically, the main hose 11 is located at an intermediate position above the grain surface in the grain warehouse, and branch hoses 7 are provided at each of the four corners above the grain surface in the grain warehouse. The branch hoses 7 and main hoses 11 cover different areas of the surface of the grain piles, ensuring the representativeness of the gas samples.

[0051] When it is necessary to detect gas in a grain pile, the central control unit sends an energizing signal to a designated drive motor and opens the intake port 5 corresponding to a designated micro gas shut-off valve 9. The central control unit controls the extraction pump to start, drawing the gas sample from within the grain pile outside the grain warehouse via a rigid pipe 8, branch hoses 7 and main hose 11, and transporting it to a gas analyzer via a safety valve.

[0052] The hose may be provided with an air intake port 5, and the micro gas on / off valve 9 is located inside the hose and is on the same horizontal plane as the central axis of the corresponding air intake port 5.

[0053] As shown in Figures 2(a)-2(c), in one specific embodiment of the present invention, the number and position of the micro gas on-off valves 9 are constructed based on a standard single-story warehouse unit, with multi-tiered pipes arranged for a 6-meter grain pile, and four series-connected rigid pipe sections 3 forming a vertical detection channel. Five sets of detection nodes are installed in the horizontal cross-section based on a spatial matrix distribution mode of pentagonal vertices and center points, with four micro gas on-off valves 9 integrated into each node, forming a 4 (vertical hierarchy) × 5 (horizontal distribution) oblique detection network. Each micro gas on-off valve 9 is assigned a unique identification number, and the numbering rule follows a three-tiered structure: "vertical hierarchy number - horizontal node alphabet code - valve serial number". For example, the number I in Figure 2(a) is numbered as "vertical second layer - horizontal node B - second valve". A central control unit is connected to the drive motor of each micro gas on-off valve 9, analyzes the target coordinates to generate control commands for the corresponding micro gas on-off valve 9, and enables selective suction of gas at the specified spatial location.

[0054] The central control unit is located outside the grain warehouse and is connected to the drive motors of each micro-gas valve 9 via a communication module, enabling individual gas suction from each intake port and forming distributed valve control. In this invention, a valve state monitoring circuit may be provided to collect the open / closed state and operating parameters of each micro-gas valve in real time. The central control unit generates valve control signals based on a preset gas collection policy or real-time input commands and transmits open / close commands to the designated micro-gas valve 9 via the communication module, enabling precise adjustment for gas detection at different locations within the grain warehouse. The power management module provides a stable operating voltage to each micro-gas valve 9 and includes an overload protection function.

[0055] In actual application, the rigid pipes 8 and hoses are first rationally positioned based on the structure of the grain warehouse and the distribution of the grain piles. The rigid pipes 8 are installed below the grain surface and extend along the depth direction of the grain warehouse, with the intake ports 5 of the rigid pipes 8 facing into the interior of the grain piles, ensuring that gas samples can be collected at different depths. The hoses are installed above the grain surface and employ a five-point layout to cover different areas of the grain pile surface, ensuring representativeness of the gas samples.

[0056] When it is necessary to detect gas in a grain pile, a remotely installed central control unit sends an energizing signal to the drive motor of a designated micro-gas valve 9, opening the intake port 5 corresponding to the designated micro-gas valve 9. It activates an extraction pump, drawing gas samples from within the grain pile through a rigid tube 8 and hose to an external header pipe of the grain warehouse, and transporting them via a safety valve to a gas analysis system or portable detector. This allows operators to quickly detect the gas conditions in the grain pile, determine the quality and safety status of the grain based on the detection data, and take timely appropriate measures.

[0057] For example, a large grain storage warehouse is equipped with the gas detection device for grain piles according to the present invention. In a single detection process, the device detects an abnormally high carbon dioxide content at an air intake 5 in a rigid pipe 8 at the bottom of the grain warehouse. Analysis suggests that this may be due to grain mold in this area. Workers immediately focus their detection efforts on this area, and after confirming the presence of localized mold, they immediately take treatment measures such as ventilation and temperature reduction to effectively prevent the spread of mold and ensure the quality and safety of the grain.

[0058] In this invention, rigid pipe sections 3 are connected to each other, and the design combining hoses and rigid pipes comprehensively covers different depths and locations of the grain pile, ensuring that the collected gas samples are representative and more realistically reflecting the internal gas conditions of the grain pile. The micro gas on / off valve 9 is remotely automated controlled by a central control unit, significantly reducing the workload on manual labor and improving the efficiency and accuracy of gas detection. Operators can flexibly select and sample different gas detection points via remote control, enabling real-time monitoring of the gas in the grain pile. The design of the header pipe, safety valve, and extraction pump outside the grain warehouse ensures the safety and stability of gas samples during transport. The multi-functional composite gas detector can simultaneously detect multiple gas components, allowing operators to easily perform remote monitoring and management, and enabling timely detection and handling of abnormal conditions in the grain pile. This invention effectively solves the problems of the prior art, achieves highly efficient and accurate detection of gases in grain piles, provides strong assurance of storage safety in grain warehouses, and possesses high practical value and future potential for widespread application.

[0059] Although this specification is described according to each example, each example does not contain only one independent technical proposal. This descriptive form of this specification is merely for clarity, and those skilled in the art should understand that the specification should be considered as a whole, and that the technical proposals of each example can be appropriately combined to form other examples that will be understood by those skilled in the art.

[0060] The series of detailed descriptions above are merely specific descriptions of feasible embodiments of the present invention. They are not intended to limit the scope of protection of the present invention, and equivalent embodiments or modifications that do not depart from the technical spirit of the present invention should be included within the scope of protection of the present invention. [Explanation of Symbols]

[0061] 1. First ventilation array 2. Second ventilation array 3. Rigid pipe section 4. On / off valve housing 401 Circular Lid 402 Intermediate square box 403 Circular bottom 404 Rotating Plate 5. Air intake 6. Gas detection points inside the grain warehouse 7 Branch hoses 8 Hard tube 9 Micro gas on / off valve 10 Connecting joint member 11. Main hose.

Claims

1. A gas detection device for grain piles, comprising a hose, a rigid tube (8), a micro gas shut-off valve (9), a central control unit, an extraction pump, and a gas analyzer, The hose includes branch hoses (7) and main hoses (11), the multiple rigid pipes (8) are arranged vertically, the top ends of the rigid pipes (8) are connected to the branch hoses (7), the multiple branch hoses (7) are connected to the main hoses (11), the rigid pipes (8) are provided with air intake ports (5), the micro gas on / off valves (9) are provided inside the rigid pipes (8) and are on the same horizontal plane as the central axis of the corresponding air intake ports (5), The micro gas shut-off valve (9) includes a shut-off valve housing (4), the shut-off valve housing (4) includes an intermediate rectangular box (402) and a rotating plate (404), the upper and lower ends of the intermediate rectangular box (402) are both open, a circular lid (401) is provided at the upper opening, a circular bottom (403) is provided at the lower opening, a first ventilation hole array (1) is provided on one side of the circular bottom (403), a second ventilation hole array (2) is provided on one side of the intermediate rectangular box (402), the second ventilation hole array (2) corresponds to the position of the intake port (5), and the rotating plate (404) is provided inside the intermediate rectangular box (402), and the rotating plate The plate (404) is connected to a drive motor via a pivot shaft, and the drive motor drives the rotating plate (404) to rotate, and when the rotating plate (404) shields the first vent array (1), it blocks the airflow passages at the bottom and top of the rigid tube (8), and at the same time releases the shielding from the second vent array (2), forming a continuous airflow passage between the intake port (5) and the top of the rigid tube (8), and when the rotating plate (404) shields the second vent array (2), it blocks the airflow passage at the top of the rigid tube (8), and at the same time releases the shielding from the first vent array (1), forming a continuous airflow passage between the bottom and top of the rigid tube (8), The inlet of the extraction pump is connected to the outlet of the main hose (11), and the outlet of the extraction pump is connected to the gas analyzer. A gas detection device for grain piles, characterized in that the central control unit is connected to a drive motor, an extraction pump, and a gas analyzer, respectively.

2. The gas detection device for a grain pile according to claim 1, characterized in that the rigid pipe (8) includes a plurality of rigid pipe sections (3) that are detachably connected.

3. The gas detection device for a grain pile according to claim 2, characterized in that the rigid pipe sections (3) are connected via threads.

4. The gas detection device for a grain pile according to claim 1, further comprising a safety valve, wherein one end of the main hose (11) extends from the grain warehouse and is connected via a fitting to a header pipe outside the grain warehouse, and the safety valve is provided in the header pipe.

5. The gas detection device for a pile of grain according to claim 1, characterized in that the branch hoses (7) and main hoses (11) are provided above the grain level in the grain warehouse, a five-point layout is adopted, that is, the main hose (11) is located at an intermediate position above the grain level in the grain warehouse, and branch hoses (7) are provided at each of the four corners above the grain level in the grain warehouse.

6. The gas detection device for a grain pile according to claim 1, characterized in that the hose is provided with an air intake port (5), and the micro gas shut-off valve (9) is provided inside the hose and is on the same horizontal plane as the central axis of the corresponding air intake port (5).

7. The gas detection device for a pile of grain according to claim 1, characterized in that the rigid pipe (8) is installed vertically below the grain level in the grain warehouse.

8. The gas detection device for a grain pile according to claim 1, characterized in that the drive motors of each of the micro gas on / off valves (9) are each connected to the central control unit.

9. The gas detection device for a grain pile according to claim 1, further comprising a power management module connected to each drive motor.

10. The gas detection device for a grain pile according to claim 1, characterized in that the gas analyzer is a gas analysis system or a portable detector.

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