A safe and environment-friendly gas sampling device for chemical enterprises

Abstract

The present application belongs to the technical field of gas sampling, and specifically relates to a safe and environmentally-friendly gas sampling device for a chemical enterprise, which comprises an external replacement mechanism and a gas sampling mechanism. The automatic cyclic replacement of a sampling bottle is realized through the cooperation of the external replacement mechanism, a rotating frame and a replacement motor. The automatic sealed butt joint of the sampling bottle and a butt joint sliding pipe is completed through the structure of a magnetic attraction trigger, a butt joint cylinder and an inclined angle sliding block. The residual gas removal and waste gas collection of an intermediate bottle before sampling are realized through a pre-evacuation system composed of the intermediate bottle, an air evacuation cylinder and an evacuation valve piece. The coordinated action of these structures solves the problems of low sampling accuracy and insufficient representativeness of the traditional gas sampling device under complex working conditions such as high temperature and high pressure, overcomes technical defects such as large single-point sampling error, easy leakage, high energy consumption and poor environmental friendliness, and significantly improves the automation degree, safety and environmental friendliness of gas sampling.

Description

Technical Field

[0001] This invention belongs to the field of gas sampling technology, specifically referring to a safe and environmentally friendly gas sampling device for chemical enterprises. Background Technology

[0002] Chemical gas sampling devices are indispensable equipment in chemical production and environmental monitoring, used to accurately collect various gas samples and provide reliable data for subsequent analysis. Their core functions encompass gas collection, sample storage, and transmission. The design emphasizes safety, sealing, and ease of operation, ensuring stable operation under complex conditions. A typical device consists of a sampling probe, a power system, a flow control system, and a sample container, achieving efficient gas sample collection through negative pressure suction. Some high-end devices integrate intelligent control systems, supporting multi-channel simultaneous sampling and real-time data monitoring, significantly improving sampling efficiency and data accuracy. In the chemical industry, gas sampling devices are not only used for routine production process monitoring but also play a crucial role in emergency response, such as detecting toxic gas leaks and ensuring personnel safety. Furthermore, with increasingly stringent environmental regulations, the application of sampling devices in environmental monitoring is becoming more widespread, covering air pollutant analysis and industrial waste gas emission monitoring.

[0003] Traditional gas sampling devices played a vital role in early chemical production, characterized by their simple structure, low cost, and ease of operation. However, with the increasing complexity of chemical production processes and the ever-increasing demands for safety and environmental protection, the shortcomings of traditional sampling devices have become increasingly apparent. Firstly, regarding sampling accuracy, traditional devices often struggle to guarantee the precision of sampled gas concentration and composition, especially under complex conditions such as high pressure and high temperature, resulting in significant sampling errors. Secondly, in terms of sample representativeness, traditional devices typically employ single-point sampling, failing to comprehensively reflect the gas conditions of the entire monitoring area, leading to a lack of scientific rigor and reliability in the sampling results. Furthermore, traditional sampling devices also exhibit significant deficiencies in safety and environmental protection, such as a tendency to cause gas leaks, high energy consumption, and insufficient consideration for environmental friendliness, making them unsuitable for the actual needs of modern chemical enterprises. Summary of the Invention

[0004] To address the aforementioned issues and overcome the shortcomings of existing technologies, this invention provides a safe and environmentally friendly gas sampling device for chemical enterprises. Through the cooperation of an external replacement mechanism, a rotating frame, and a replacement motor, automatic cyclic replacement of sampling bottles is achieved. The structure of a magnetic trigger, a docking cylinder, and an angled slider enables automatic sealing and docking of the sampling bottle and the docking slide tube. A pre-venting system composed of an intermediate bottle, an air venting cylinder, and an air venting valve plate ensures the removal of residual gas from the intermediate bottle and the collection of waste gas before sampling. These structures work synergistically to solve the problems of low sampling accuracy and insufficient representativeness in traditional gas sampling devices under complex conditions such as high temperature and high pressure. It overcomes the technical defects of large single-point sampling errors, easy leakage, high energy consumption, and poor environmental performance, significantly improving the automation, safety, and environmental friendliness of gas sampling.

[0005] The technical solution adopted by the present invention is as follows: The present invention provides a safe and environmentally friendly gas sampling device for chemical enterprises, including an external replacement mechanism and a gas sampling mechanism, wherein the gas sampling mechanism is located above the external replacement mechanism.

[0006] Furthermore, the external replacement mechanism includes a storage component, a replacement shaft rotatably mounted within the storage component, a rotating frame fixedly connected to the replacement shaft, and a replacement motor within the storage component. The output end of the replacement motor is connected to the bottom of the replacement shaft via a transmission connection. This combination of the storage component, replacement shaft, rotating frame, and replacement motor enables the storage and automatic rotation of multiple sampling bottles, thereby improving continuous sampling capability.

[0007] Furthermore, the gas sampling mechanism is equipped with a docking assembly, which includes a push arm, a limiting groove, an opening and closing rack, a magnetic fastener, a docking frame, and a magnetic trigger. The push arm is located inside the gas sampling mechanism, the docking frame is located inside the gas sampling mechanism, the limiting groove is located above the docking frame, the opening and closing rack is located inside the limiting groove, the magnetic fastener is slidably located inside the docking frame, and the magnetic trigger is located above the limiting groove. The docking assembly is used to achieve precise positioning, clamping and fixing, and automatic docking of the sampling bottle, ensuring the stability and sealing of the sampling process.

[0008] Furthermore, the magnetic fastener includes a magnetic mounting arm that is slidably connected to the docking frame. The docking frame has symmetrical magnetic grippers that rotate within it. An electromagnet is located in the middle of each magnetic gripper. A release spring is connected between the symmetrical magnetic grippers. The magnetic trigger is used to achieve automatic clamping and release of the sampling bottle through electromagnetic control, thereby improving operational efficiency and safety.

[0009] Furthermore, a docking cylinder is provided inside the docking frame, and an angled slider is slidably provided inside the docking frame, the angled slider being fixedly connected to the telescopic end of the docking cylinder.

[0010] Furthermore, the docking frame is provided with a synchronous slide, the bottom of which is fixedly connected to the magnetic mounting arm.

[0011] Furthermore, the rotating frame is equipped with fixed magnets arranged around the replacement axis. The fixed magnets are used to attract and fix the sampling bottle, ensuring that it does not shift or fall off during rotation and movement.

[0012] Furthermore, the docking frame is provided with a right-angle sliding groove.

[0013] Furthermore, the telescopic end of the push arm is provided with a gas cylinder holder.

[0014] Furthermore, the gas sampling mechanism is equipped with a gas sampling system, which includes a sampling pump, a docking slide pipe, a gas sampling frame, a connecting pipe, an intermediate bottle, an air venting cylinder, an air venting valve, an air inlet pipe, a waste discharge pipe, and a waste gas cylinder. The gas sampling frame is located within the gas sampling mechanism, the sampling pump is located at the top of the gas sampling frame, the intermediate bottle is located in the middle of the gas sampling frame, the air venting cylinder is fixedly connected to the bottom of the intermediate bottle, an air venting valve is slidably installed inside the intermediate bottle, and the air venting valve is fixedly connected to the telescopic end of the air venting cylinder, the waste gas cylinder is located at the bottom of the gas sampling frame, the docking slide pipe is installed on a synchronous slide block, the docking slide pipe is connected to the intermediate bottle through the connecting pipe, the connecting pipe is equipped with a gas supply valve, the air inlet pipe is connected to the top of the intermediate bottle, the waste discharge pipe connects to both the waste gas cylinder and the intermediate bottle, and the suction end of the sampling pump is connected to the connecting pipe. The gas sampling system is used to realize the collection, temporary storage, transfer, and waste gas treatment of gas, ensuring the integrity and environmental friendliness of the sampling process.

[0015] As a further preferred embodiment of the present invention, the air intake pipe is provided with an air intake valve, and the exhaust pipe is provided with an exhaust valve.

[0016] As a further preferred embodiment of the present invention, a sampling bottle is mounted on the rotating frame, the sampling bottle is attracted to a fixed magnet, a valve stem is rotatably connected to the top of the sampling bottle, a cylinder valve is fixedly connected to the upper end of the valve stem, a valve piston is slidably provided at the upper end of the sampling bottle, and the lower end of the valve stem is engaged with the valve piston.

[0017] As a further preferred embodiment of the present invention, the docking slide tube includes a front end tube, a rear end tube, and a front slide rod. The rear end tube is fixedly connected to the synchronous slide block, the front end tube is slidably connected to the rear end tube, and the front end tube is also slidably connected to the synchronous slide block. A vertical front slide rod is connected to the front end tube, and the front slide rod is slidably connected to both the angled slider and the right-angle slide groove.

[0018] The beneficial effects of the safety and environmental protection gas sampling device for chemical enterprises provided in this solution are as follows:

[0019] (1) Multiple sampling bottles can be pre-installed and automatically cyclically replaced by the rotating frame, replacement motor and fixed magnet in the external replacement mechanism, which significantly improves sampling efficiency and is especially suitable for scenarios that require multi-point and high-frequency sampling.

[0020] (2) Remove residual gas in advance through the intermediate bottle and the evacuation system (evacuation cylinder, evacuation valve plate) to ensure that the intermediate bottle is clean before each sampling, avoid cross-contamination, and improve the purity and representativeness of the gas sample;

[0021] (3) The sampling bottle is pre-vacuumed and gas is automatically drawn in by pressure difference to avoid component changes or adsorption losses that may be caused by traditional pump suction methods, thus ensuring the authenticity of the sampled components;

[0022] (4) Collect residual gas and emissions through the gas collection system to prevent leakage of toxic and harmful gases, ensure the safety of operators, and meet environmental protection requirements;

[0023] (5) The magnetic gripper and release spring structure ensures that the sampling bottle is firmly clamped during docking, avoiding the risk of falling off or leaking, and is especially suitable for high-pressure and high-risk environments. Attached Figure Description

[0024] Figure 1 This invention provides a schematic diagram of the structure of a safe and environmentally friendly gas sampling device for chemical enterprises. Figure 1 ;

[0025] Figure 2 This invention provides a schematic diagram of the structure of a safe and environmentally friendly gas sampling device for chemical enterprises. Figure 2 ;

[0026] Figure 3 This is a schematic diagram of the structure for storing components;

[0027] Figure 4 This is a schematic diagram of the gas extraction mechanism;

[0028] Figure 5 This is a diagram showing the mounting relationships of the docking framework;

[0029] Figure 6 This is a diagram showing the positional relationship between the synchronous slide and the magnetic mounting arm;

[0030] Figure 7 This is a schematic diagram of the gas extraction system.

[0031] Figure 8 This is a cross-sectional view of the intermediate bottle;

[0032] Figure 9 This is a diagram showing the positional relationship between the angled slider and the synchronous slider.

[0033] Figure 10This is a diagram showing the initial position of the angled slider.

[0034] Figure 11 This is a diagram showing the sliding position of the angled slider;

[0035] Figure 12 This is a cross-sectional view of the sampling bottle;

[0036] Figure 13 This is a diagram showing the positional relationship between the sampling bottle and the gas cylinder holder.

[0037] Among them, 1. External replacement mechanism, 2. Gas sampling mechanism, 101. Storage component, 102. Rotating frame, 103. Replacement shaft, 104. Replacement motor, 105. Docking component, 106. Pushing arm, 107. Limiting groove, 108. Opening and closing rack, 109. Magnetic fastener, 110. Docking frame, 111. Magnetic trigger, 112. Electromagnet, 113. Release spring, 114. Magnetic mounting arm, 115. Magnetic gripper, 116. Docking cylinder, 117. Angled slider, 118. Synchronous slide, 119. Fixing magnet, 1 20. Right-angle slide rail; 121. Gas cylinder holder; 201. Gas sampling system; 202. Sampling pump; 203. Connecting slide pipe; 204. Gas sampling frame; 205. Connecting pipe; 206. Intermediate bottle; 207. Air venting cylinder; 208. Air venting valve plate; 209. Air inlet pipe; 210. Waste discharge pipe; 211. Air inlet valve; 212. Exhaust valve; 213. Sampling bottle; 214. Front end pipe; 215. Rear end pipe; 216. Front slide bar; 217. Waste gas cylinder; 218. Gas cylinder valve; 219. Valve stem; 220. Valve piston; 221. Gas delivery valve.

[0038] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0040] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not 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.

[0041] like Figures 1-13 As shown, the present invention provides a safe and environmentally friendly gas sampling device for chemical enterprises, including an external replacement mechanism 1 and a gas sampling mechanism 2, wherein the gas sampling mechanism 2 is located above the external replacement mechanism 1.

[0042] The external replacement mechanism 1 includes a storage component 101, within which a replacement shaft 103 is rotatably mounted. A rotating frame 102 is fixedly connected to the replacement shaft 103. A replacement motor 104 is also located within the storage component 101, with its output end connected to the bottom of the replacement shaft 103. The gas extraction mechanism 2 includes a docking component 105, comprising a push arm 106, a limiting groove 107, an opening and closing rack 108, a magnetic fastener 109, a docking frame 110, and a magnetic trigger 111. The push arm 106 and docking frame 110 are located within the gas extraction mechanism 2. The limiting groove 107 is located above the docking frame 110, and the opening and closing rack 108 is located within the gas extraction mechanism 2. Within the limiting groove 107, a magnetic fastener 109 is slidably disposed within the docking frame 110, and a magnetic trigger 111 is disposed above the limiting groove 107. The magnetic fastener 109 includes a magnetic mounting arm 114, which is slidably connected to the docking frame 110. Symmetrical magnetic grippers 115 are rotatably disposed within the docking frame 110, with an electromagnet 112 located in the center of each gripper 115. Release springs 113 connect the symmetrical magnetic grippers 115. A docking cylinder 116 is disposed within the docking frame 110, and an angled slider 117 is slidably disposed within the docking frame 110, with the angled slider 117 fixedly connected to the telescopic end of the docking cylinder 116. A synchronous slide block 118 is disposed within the docking frame 110. The bottom of component 8 is fixedly connected to the magnetic mounting arm 114; the rotating frame 102 is provided with fixed magnets 119 arranged around the replacement shaft 103; the docking frame 110 is provided with a right-angle slide groove 120; the telescopic end of the push arm 106 is provided with a gas cylinder holder 121; the gas sampling mechanism 2 is provided with a gas sampling system 201, which includes a sampling pump 202, a docking slide 203, a gas sampling frame 204, a connecting pipe 205, an intermediate bottle 206, an air venting cylinder 207, an air venting valve 208, an air inlet pipe 209, a waste pipe 210, and a waste gas cylinder 217. The gas sampling frame 204 is located inside the gas sampling mechanism 2, the sampling pump 202 is located at the top of the gas sampling frame 204, and the intermediate bottle 206 is located in the middle of the gas sampling frame 204. The air venting cylinder 207 is fixedly connected to the bottom of the intermediate bottle 206. An air venting valve 208 is slidably installed inside the intermediate bottle 206. The air venting valve 208 is fixedly connected to the telescopic end of the air venting cylinder 207. The waste gas cylinder 217 is located at the bottom of the gas sampling frame 204. The docking slide pipe 203 is installed on the synchronous slide block 118. The docking slide pipe 203 is connected to the intermediate bottle 206 through the connecting pipe 205. The connecting pipe 205 is equipped with a gas supply valve 221. The gas inlet pipe 209 is connected to the top of the intermediate bottle 206. The waste discharge pipe 210 is connected to both the waste gas cylinder 217 and the intermediate bottle 206. The suction end of the sampling pump 202 is connected to the connecting pipe 205. The gas inlet pipe 209 is equipped with a gas inlet valve 211, and the waste discharge pipe 210 is equipped with a gas exhaust valve 212.A sampling bottle 213 is mounted on the rotating frame 102. The sampling bottle 213 is attracted to a fixed magnet 119. A valve stem 219 is rotatably connected to the top of the sampling bottle 213. A cylinder valve 218 is fixedly connected to the upper end of the valve stem 219. A valve piston 220 is slidably mounted on the upper end of the sampling bottle 213. The lower end of the valve stem 219 is engaged with the valve piston 220. The docking slide tube 203 includes a front tube 214, a rear tube 215, and a front slide rod 216. The rear tube 215 is fixedly connected to the synchronous slide block 118. The front tube 214 is slidably connected to the rear tube 215 and simultaneously slidably connected to the synchronous slide block 118. A vertical front slide rod 216 is connected to the front tube 214. The front slide rod 216 is simultaneously slidably connected to the angled slider 117 and the right-angle slide groove 120.

[0043] In practical use, the sampling bottle 213 is pre-vacuumed to ensure that gas is automatically drawn into the sampling bottle 213 during sampling. The required number of sampling bottles 213 are installed on the rotating frame 102 according to the number of samples to be sampled. The sampling bottles 213 are attracted by the fixed magnet 119, and the rotating frame 102 limits and fixes the sampling bottles 213. To begin sampling, a pre-venting operation is performed: the inlet valve 211 and the outlet valve 221 are closed, and the exhaust valve 212 is opened. The venting cylinder 207 is activated, extending and using the venting valve plate 208 to discharge the residual gas in the intermediate bottle 206 through the waste pipe 210. The residual air is squeezed into the waste gas bottle 217. Then, the exhaust valve 212 is closed, and the venting cylinder 207 shortens, causing the venting valve plate 208 to slide. Simultaneously, the sampling pump 202 is activated to evacuate the intermediate bottle 206. During evacuation, the gas is drawn through the connecting pipe 2... 05. Extract the gas from the intermediate bottle 206, connect the gas inlet pipe 209 to the gas collection pipe, and open the gas inlet valve 211. Gas can then be collected through the intermediate bottle 206. To perform the gas collection operation, first deliver the sampling bottle 213. The push arm 106 is initially in the extended state. Activate the push arm 106, which shortens and causes the gas cylinder holder 121 to move upward. During the upward movement of the gas cylinder holder 121, the bottom of the sampling bottle 213 will be inserted into the gas cylinder holder 121. The sampling bottle 213 moves upward along with the gas cylinder holder 121. When the top of the sampling bottle 213 contacts the magnetic trigger 111, the magnetic trigger 111 activates the electromagnet 112. The electromagnets 112 attract each other, causing the magnetic gripper 115 to clamp the sampling bottle 213. At the same time, the release spring 113 is stretched by the magnetic gripper 115, and the push arm 106 is extended, allowing the gas cylinder holder 121 to separate from the sampling bottle 213.The docking of sampling bottle 213 begins. The docking cylinder 116 is activated, extending to push the angled slider 117 to slide. The sliding slider 117 pushes the front tube 214 into the inlet of sampling bottle 213. The docking cylinder 116 then continues to extend, pushing the angled slider 117, synchronous slide block 118, magnetic fastener 109, and sampling bottle 213 together. During the movement of sampling bottle 213, cylinder valve 218 contacts the opening and closing rack 108. The edge of cylinder valve 218 meshes with the opening and closing rack 108, causing cylinder valve 218 to rotate and drive valve stem 219 to rotate as well. Rotation causes valve piston 220 to move upward, connecting sampling bottle 213 to front-end tube 214. At this time, the pressure inside sampling bottle 213 is less than that in intermediate bottle 206. Gas supply valve 221 is opened, and gas in intermediate bottle 206 enters sampling bottle 213 sequentially through connecting tube 205, rear-end tube 215, and front-end tube 214. Afterward, gas supply valve 221 is closed, and docking cylinder 116 continues to contract, causing angled slider 117, synchronous slide block 118, magnetic fastener 109, and sampling bottle 213 to move together. The edge of cylinder valve 218 engages with opening and closing rack 108, and cylinder valve 218 rotates, driving valve... The valve stem 219 rotates together with the sample bottle 213. The rotation of the valve stem 219 causes the valve piston 220 to move downwards, sealing the air inlet of the sample bottle 213. When the sample bottle 213 moves again below the magnetic trigger 111, the push arm 106 retracts, and the bottom of the sample bottle 213 inserts into the gas cylinder holder 121. Simultaneously, the electromagnet 112 is deactivated, and the release spring 113 pulls the magnetic gripper 115 to release the sample bottle 213. At this point, the sample bottle 213 is fixed in the gas cylinder holder 121 by its own weight and moves together with the gas cylinder holder 121. The push arm 106 extends to transport the sample bottle 213 to the rotating frame 102 below. The sampling bottle 213 is attracted by a fixed magnet 119. Then, the push arm 106 extends further, separating the gas cylinder holder 121 from the bottom of the sampling bottle 213. The replacement motor 104 is then activated, driving the rotating frame 102 and the replacement shaft 103 to rotate together. This allows the collected sampling bottle 213 to rotate with the rotating frame 102, aligning the new sampling bottle 213 vertically with the gas cylinder holder 121. After completing the gas collection operation, the exhaust valve 212 is opened, and the air venting cylinder 207 extends, pushing the residual gas in the intermediate bottle 206 into the waste gas bottle 217, thus completing the waste gas collection.

[0044] The above is the specific workflow of this invention. This step can be repeated next time it is used.

[0045] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0046] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention.

[0047] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A safe and environmentally friendly gas sampling device for chemical enterprises, characterized in that: The system includes an external replacement mechanism (1) and a gas sampling mechanism (2). The gas sampling mechanism (2) is located above the external replacement mechanism (1). The gas sampling mechanism (2) has a docking assembly (105) inside. The docking assembly (105) includes a docking frame (110) inside the gas sampling mechanism (2). The docking frame (110) has a docking cylinder (116) inside. The docking frame (110) has a sliding angled slider (117) inside. The angled slider (117) is fixedly connected to the telescopic end of the docking cylinder (116). The docking frame (110) has a synchronous slide block (118) inside. The docking frame (110) has a right-angle slide groove (120). The gas sampling mechanism (2) has a gas sampling system (201) inside. The gas sampling system (201) includes... The assembly includes a docking slide (203), which comprises a front end tube (214), a rear end tube (215), and a front slide rod (216). The rear end tube (215) is fixedly connected to the synchronous slide block (118), and the front end tube (214) is slidably connected to the rear end tube (215). The front end tube (214) is also slidably connected to the synchronous slide block (118). A vertical front slide rod (216) is connected to the front end tube (214), and the front slide rod (216) is slidably connected to both the angled slider (117) and the right-angle slide groove (120). The docking assembly (105) also includes a push arm (106), a limiting groove (107), an opening and closing rack (108), a magnetic fastener (109), and a magnetic trigger (111). The push arm (106) is located inside the gas sampling mechanism (2). The limiting groove (107) is located above the docking frame (110), the opening and closing rack (108) is located in the limiting groove (107), the magnetic fastener (109) is slidably located in the docking frame (110), the magnetic trigger (111) is located above the limiting groove (107), and the telescopic end of the push arm (106) is provided with a gas cylinder holder (121).

2. The chemical enterprise safety and environmental protection gas sampling device according to claim 1, characterized in that: The external replacement mechanism (1) is provided with a storage component (101), and a replacement shaft (103) is rotatably provided in the storage component (101). A rotating frame (102) is fixedly connected to the replacement shaft (103). A replacement motor (104) is provided in the storage component (101), and the output end of the replacement motor (104) is connected to the bottom of the replacement shaft (103) via a transmission connection.

3. The chemical enterprise safety and environmental protection gas sampling device according to claim 2, characterized in that: The magnetic fastener (109) includes a magnetic mounting arm (114), which is slidably connected to a docking frame (110). The docking frame (110) is rotatably provided with symmetrical magnetic claws (115). An electromagnet (112) is provided in the middle of the magnetic claws (115). A release spring (113) is connected between the symmetrical magnetic claws (115).

4. The chemical enterprise safety and environmental protection gas sampling device according to claim 3, characterized in that: The bottom of the synchronous slide (118) is fixedly connected to the magnetic mounting arm (114).

5. A chemical enterprise safety and environmental protection gas sampling device according to claim 4, characterized in that: The rotating frame (102) is provided with fixed magnets (119) arranged around the replacement shaft (103).

6. A chemical enterprise safety and environmental protection gas sampling device according to claim 5, characterized in that: The gas sampling system (201) also includes a sampling pump (202), a gas sampling frame (204), a connecting pipe (205), an intermediate bottle (206), an air venting cylinder (207), an air venting valve (208), an air inlet pipe (209), a waste pipe (210), and a waste gas cylinder (217). The gas sampling frame (204) is located inside the gas sampling mechanism (2). The sampling pump (202) is located at the top of the gas sampling frame (204). The intermediate bottle (206) is located in the middle of the gas sampling frame (204). The air venting cylinder (207) is fixedly connected to the bottom of the intermediate bottle (206). An air venting valve (208) is slidably installed inside the intermediate bottle (206). The venting valve plate (208) is fixedly connected to the telescopic end of the venting cylinder (207). The waste gas bottle (217) is located at the bottom of the gas sampling frame (204). The docking slide pipe (203) is installed on the synchronous slide block (118). The docking slide pipe (203) is connected to the intermediate bottle (206) through the connecting pipe (205). The connecting pipe (205) is equipped with a gas supply valve (221). The gas inlet pipe (209) is connected to the top of the intermediate bottle (206). The waste discharge pipe (210) is connected to both the waste gas bottle (217) and the intermediate bottle (206). The suction end of the sampling pump (202) is connected to the connecting pipe (205).

7. A chemical enterprise safety and environmental protection gas sampling device according to claim 6, characterized in that: The air intake pipe (209) is provided with an air intake valve (211), and the exhaust pipe (210) is provided with an exhaust valve (212).

8. A chemical enterprise safety and environmental protection gas sampling device according to claim 7, characterized in that: A sampling bottle (213) is installed on the rotating frame (102). The sampling bottle (213) is attracted to a fixed magnet (119). A valve stem (219) is rotatably connected to the top of the sampling bottle (213). A cylinder valve (218) is fixed to the upper end of the valve stem (219). A valve piston (220) is slidably provided on the upper end of the sampling bottle (213). The lower end of the valve stem (219) is engaged with the valve piston (220).

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