Safe and environment-friendly gas sampling device for chemical enterprises

Abstract

The invention belongs to the technical field of gas sampling, and particularly relates to a safe and environment-friendly gas sampling device for chemical enterprises, which comprises an external replacement mechanism and a gas sampling mechanism. Through cooperation of the external replacement mechanism, the rotating frame and the replacement motor, automatic cycle replacement of the sampling bottles is realized; automatic sealing butt joint of the sampling bottle and the butt joint sliding pipe is completed through the structure of the magnetic attraction trigger, the butt joint air cylinder and the bevel angle sliding block; residual gas removal and waste gas collection of the intermediate bottle before sampling are realized through a pre-exhaust system consisting of the intermediate bottle, the exhaust air cylinder and the exhaust valve plate. Through the synergistic effect of the structures, the problems that a traditional gas sampling device is low in sampling accuracy and insufficient in representativeness under the complex working conditions of high temperature, high pressure and the like are solved, the technical defects that single-point sampling is large in error, prone to leakage, high in energy consumption, poor in environmental friendliness and the like are overcome, and the automation degree, safety and environmental friendliness of gas sampling are remarkably improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of gas sampling, and particularly relates to a safe and environmentally-friendly gas sampling device for a chemical enterprise. BACKGROUND

[0002] A chemical gas sampling device is an indispensable important equipment in the field of chemical production and environmental monitoring, which is used for accurately collecting various gas samples to provide reliable basis for subsequent analysis. Its core functions include gas collection, sample storage and transmission, and design emphasizes safety, sealing and operation convenience to ensure stable operation under complex working conditions. A typical device is composed of a sampling probe, a power system, a flow control system and a sample container, and through the principle of negative pressure suction, efficient collection of gas samples is realized. Some high-end devices integrate intelligent control systems to support multi-channel synchronous sampling and real-time data monitoring, which significantly improves sampling efficiency and data accuracy. In the chemical industry, the gas sampling device is not only used for conventional production process monitoring, but also plays a key role in emergency response, such as detecting toxic gas leakage to ensure personnel safety. In addition, with the increasing strictness of environmental protection regulations, the sampling device is increasingly widely used in environmental monitoring, including atmospheric pollutant analysis and industrial waste gas emission monitoring.

[0003] The traditional gas sampling device has played an important role in early chemical production, and its characteristics mainly lie in simple structure, low cost and convenient operation. However, with the complication of production process in chemical enterprises and the continuous improvement of safety and environmental protection requirements, the shortcomings of the traditional sampling device gradually appear. Firstly, in terms of sampling accuracy, the traditional device often cannot guarantee the accuracy of the sampling gas concentration and composition, especially under complex conditions such as high pressure and high temperature, the sampling error is large; secondly, in terms of sampling representativeness, the traditional device usually adopts single-point sampling method, which cannot fully reflect the gas conditions of the whole monitoring area, resulting in that the sampling results lack scientificity and reliability; in addition, the traditional sampling device also has obvious defects in safety and environmental protection, such as easy gas leakage, high energy consumption and insufficient consideration of environmental friendliness, which makes it difficult to meet the actual needs of modern chemical enterprises. SUMMARY

[0004] In view of the above, in order to overcome the defects of the prior art, the present application provides a safe and environmentally friendly gas sampling device for a chemical enterprise, which realizes automatic cyclic replacement of the sampling bottle through the cooperation of the external replacement mechanism, the rotating frame and the replacement motor; through the structure of the magnetic attraction trigger, the docking cylinder and the inclined angle slider, the automatic sealing docking of the sampling bottle and the docking slide pipe is completed; through the pre-evacuation system composed of the intermediate bottle, the air evacuation cylinder and the evacuation valve piece, the residual gas removal and waste gas collection of the intermediate bottle before sampling are realized. The coordinated action of these structures solves the problems of low sampling accuracy and insufficient representativeness of traditional gas sampling devices under complex working conditions such as high temperature and high pressure, overcomes the technical defects of large single-point sampling error, easy leakage, high energy consumption and poor environmental friendliness, and significantly improves the automation, safety and environmental friendliness of gas sampling.

[0005] The technical scheme adopted by the present application is as follows: The present application provides a safe and environmentally friendly gas sampling device for a chemical enterprise, which comprises an external replacement mechanism and a gas sampling mechanism.

[0006] Further, the external replacement mechanism is provided with a storage assembly, a replacement shaft is rotatably arranged in the storage assembly, a rotating frame is fixedly connected to the replacement shaft, a replacement motor is arranged in the storage assembly, and the output end of the replacement motor is in driving connection with the bottom of the replacement shaft. The combination of the storage assembly, the replacement shaft, the rotating frame and the replacement motor is used to realize the storage and automatic rotation of multiple sampling bottles, thereby improving the continuous sampling capacity.

[0007] Further, the gas sampling mechanism is provided with a docking assembly, the docking assembly comprises a pushing arm, a limiting groove, an opening and closing rack, a magnetic attraction fastener, a docking frame and a magnetic attraction trigger, the pushing arm is arranged in the gas sampling mechanism, the docking frame is arranged in the gas sampling mechanism, the limiting groove is arranged above the docking frame, the opening and closing rack is arranged in the limiting groove, the magnetic attraction fastener is slidably arranged in the docking frame, and the magnetic attraction trigger is arranged above the limiting groove. The docking assembly is used to realize accurate positioning, clamping and automatic docking of the sampling bottle, so as to ensure the stability and sealing performance of the sampling process.

[0008] Further, the magnetic attraction fastener comprises a magnetic attraction carrying arm, the magnetic attraction carrying arm is in sliding connection with the docking frame, symmetrical magnetic attraction clamps are rotatably arranged in the docking frame, an electromagnet is arranged at the middle part of the magnetic attraction clamp, and a release spring is connected between the symmetrical magnetic attraction clamps. The magnetic attraction trigger is used to realize automatic clamping and release of the sampling bottle through electromagnetic control, thereby improving the operation efficiency and safety.

[0009] Further, the docking frame is provided with a docking cylinder, an inclined angle slider is slidably arranged in the docking frame, and the inclined angle slider is fixedly connected to the telescopic end of the docking cylinder.

[0010] Further, the docking frame is internally provided with a synchronous sliding seat, and the bottom of the synchronous sliding seat is fixedly connected with the magnetic attraction carrying arm.

[0011] Further, the rotating frame is provided with fixed magnets arranged around the replacement rotating shaft, and the fixed magnets are used for attracting and fixing the sampling bottle, so that the sampling bottle is prevented from being displaced or falling off during rotation and movement.

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

[0013] Further, the telescopic end of the pushing arm is provided with a gas cylinder clamping seat.

[0014] Further, the gas sampling mechanism is internally provided with a gas sampling system, the gas sampling system comprises a sampling pump, a docking sliding pipe, a gas sampling frame, a connecting pipe, an intermediate bottle, an air exhausting cylinder, an air exhausting valve piece, an air inlet connecting pipe, a waste gas pipe and a waste gas bottle, the gas sampling frame is arranged in the gas sampling mechanism, the sampling pump is arranged at the top of the gas sampling frame, the intermediate bottle is arranged in the middle of the gas sampling frame, the air exhausting cylinder is fixedly connected with the bottom of the intermediate bottle, the air exhausting valve piece is slidably arranged in the intermediate bottle, the air exhausting valve piece is fixedly connected with the telescopic end of the air exhausting cylinder, the waste gas bottle is arranged at the bottom of the gas sampling frame, the docking sliding pipe is installed on the synchronous sliding seat, the docking sliding pipe is communicated with the intermediate bottle through the connecting pipe, the connecting pipe is provided with a gas conveying valve, the air inlet connecting pipe is communicated with the top of the intermediate bottle, the waste gas pipe is simultaneously communicated with the waste gas bottle and the intermediate bottle, and the air suction end of the sampling pump is communicated with the connecting pipe.

[0015] As a further preferred aspect of the present application, the air inlet connecting pipe is provided with an air inlet valve, and the waste gas pipe is provided with an air outlet valve.

[0016] As a further preferred aspect of the present application, the rotating frame is installed with a sampling bottle, the sampling bottle is attracted to the fixed magnet, the top of the sampling bottle is rotatably connected with a valve rod, the upper end of the valve rod is fixedly connected with a steel bottle valve, the upper end of the sampling bottle is slidably provided with a valve piston, and the lower end of the valve rod is engagedly connected with the valve piston.

[0017] As a further preferred aspect of the present application, the docking sliding pipe comprises a front end pipe, a rear end pipe and a front sliding rod, the rear end pipe is fixedly connected with the synchronous sliding seat, the front end pipe is slidably connected with the rear end pipe, the front end pipe is slidably connected with the synchronous sliding seat, the front end pipe is connected with a vertical front sliding rod, and the front sliding rod is slidably connected with the bevel angle sliding block and the right-angle sliding groove.

[0018] The chemical enterprise safety and environmental protection gas sampling device provided by the scheme has the following beneficial effects: (1) Through the rotating frame, replacement motor and fixed magnet in the external replacement mechanism, multiple sampling bottles can be pre-installed and automatically replaced in circulation, which significantly improves the sampling efficiency, especially suitable for scenes requiring multi-point and high-frequency sampling; (2) The residual gas is pre-removed through the intermediate bottle and emptying system (emptying cylinder and emptying valve piece), so that the intermediate bottle is in a clean state before each sampling, cross contamination is avoided, and the purity and representativeness of the gas sample are improved; (3) The sampling bottle is pre-vacuumized, and the gas is automatically sucked by using pressure difference, so that the component change or adsorption loss caused by the traditional pump suction method is avoided, and the authenticity of the sampling composition is ensured; (4) The residual gas and exhaust are collected through the gas collection system, the leakage of toxic and harmful gas is prevented, the safety of the operator is ensured, and the environmental protection requirement is met; (5) The magnetic attraction claw and release spring structure ensure stable clamping of the sampling bottle during docking, and the risk of falling off or leakage is avoided, especially suitable for high-pressure and high-risk environments. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 Structure diagram of a safety and environmental protection gas sampling device for a chemical enterprise Figure One ; Figure 2 Structure diagram of a safety and environmental protection gas sampling device for a chemical enterprise Figure Two ; Figure 3 Structure diagram of a storage assembly Figure 4 Structure diagram of a gas collection mechanism Figure 5 Carrying relationship diagram of a docking frame Figure 6 Position relationship diagram of a synchronous sliding seat and a magnetic attraction carrying arm Figure 7 Structure diagram of a gas collection system Figure 8 Sectional view of an intermediate bottle Figure 9 Position relationship diagram of an inclined angle sliding block and a synchronous sliding seat Figure 10 Initial position diagram of an inclined angle sliding block Figure 11 Sliding position diagram of an inclined angle sliding block Figure 12 Sectional view of a sampling bottle Figure 13 Position relationship diagram of a sampling bottle and a gas bottle clamping seat

[0020] Wherein, 1, external replacement mechanism, 2, gas sampling mechanism, 101, storage assembly, 102, rotating frame, 103, replacement shaft, 104, replacement motor, 105, docking assembly, 106, push arm, 107, limit groove, 108, opening and closing rack, 109, magnetic fastener, 110, docking frame, 111, magnetic trigger, 112, electromagnet, 113, release spring, 114, magnetic carrying arm, 115, magnetic gripper, 116, docking cylinder, 117, bevel angle slider, 118, synchronous slide, 119, fixed magnet, 120, right-angle slide, 121, gas cylinder holder, 201, gas sampling system, 202, sampling pump, 203, docking slide pipe, 204, gas sampling frame, 205, connecting pipe, 206, intermediate bottle, 207, air exhaust cylinder, 208, exhaust valve piece, 209, air inlet connector, 210, waste pipe, 211, air inlet valve, 212, exhaust valve, 213, sampling bottle, 214, front-end pipe, 215, rear-end pipe, 216, front slide rod, 217, waste gas bottle, 218, cylinder valve, 219, valve rod, 220, valve piston, 221, gas delivery valve.

[0021] The accompanying drawings are used to provide a further understanding of the present application, and constitute a part of the specification, and are used to explain the present application together with embodiments of the present application, and do not constitute a limitation on the present application. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0023] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0024] As Figures 1-13 shown, the present application provides a chemical enterprise safety environmental protection gas sampling device, which comprises an external replacement mechanism 1 and a gas sampling mechanism 2, and the gas sampling mechanism 2 is arranged above the external replacement mechanism 1.

[0025] The external replacement mechanism 1 is internally provided with a storage assembly 101, the storage assembly 101 is internally rotatably provided with a replacement rotating shaft 103, the replacement rotating shaft 103 is fixedly connected with a rotating frame 102, the storage assembly 101 is internally provided with a replacement motor 104, and the output end of the replacement motor 104 is in transmission connection with the bottom of the replacement rotating shaft 103; the gas sampling mechanism 2 is internally provided with a docking assembly 105, the docking assembly 105 comprises a pushing arm 106, a limiting groove 107, an opening and closing rack 108, a magnetic attraction fastener 109, a docking frame 110 and a magnetic attraction trigger 111, the pushing arm 106 is arranged in the gas sampling mechanism 2, the docking frame 110 is arranged in the gas sampling mechanism 2, the limiting groove 107 is arranged above the docking frame 110, the opening and closing rack 108 is arranged in the limiting groove 107, the magnetic attraction fastener 109 is slidably arranged in the docking frame 110, and the magnetic attraction trigger 111 is arranged above the limiting groove 107; the magnetic attraction fastener 109 comprises a magnetic attraction carrying arm 114, the magnetic attraction carrying arm 114 is in sliding connection with the docking frame 110, the docking frame 110 is internally rotatably provided with symmetrical magnetic attraction clamps 115, the middle part of the magnetic attraction clamp 115 is provided with an electromagnet 112, and the symmetrical magnetic attraction clamps 115 are connected with a release spring 113; the docking frame 110 is internally provided with a docking cylinder 116, the docking frame 110 is slidably provided with an inclined angle sliding block 117, and the inclined angle sliding block 117 is fixedly connected with the telescopic end of the docking cylinder 116; the docking frame 110 is internally provided with a synchronous sliding seat 118, and the bottom of the synchronous sliding seat 118 is fixedly connected with the magnetic attraction carrying arm 114; the rotating frame 102 is provided with fixed magnets 119 arranged around the replacement rotating shaft 103; the docking frame 110 is provided with a right-angle sliding groove 120; the telescopic end of the pushing arm 106 is provided with a gas cylinder clamping seat 121; the gas sampling mechanism 2 is internally provided with a gas sampling system 201, the gas sampling system 201 comprises a sampling pump 202, a docking sliding pipe 203, a gas sampling frame 204, a connecting pipe 205, an intermediate bottle 206, an emptying cylinder 207, an emptying valve plate 208, an air inlet connecting pipe 209, a waste gas pipe 210 and a waste gas bottle 217, the gas sampling frame 204 is arranged in the gas sampling mechanism 2, the sampling pump 202 is arranged at the top of the gas sampling frame 204, the intermediate bottle 206 is arranged at the middle part of the gas sampling frame 204, the emptying cylinder 207 is fixedly connected with the bottom of the intermediate bottle 206, the emptying valve plate 208 is slidably arranged in the intermediate bottle 206, the emptying valve plate 208 is fixedly connected with the telescopic end of the emptying cylinder 207, the waste gas bottle 217 is arranged at the bottom of the gas sampling frame 204, the docking sliding pipe 203 is mounted on the synchronous sliding seat 118, the docking sliding pipe 203 is in communication with the intermediate bottle 206 through the connecting pipe 205, the connecting pipe 205 is provided with a gas conveying valve 221, the air inlet connecting pipe 209 is in communication with the top of the intermediate bottle 206, the waste gas pipe 210 is in communication with the waste gas bottle 217 and the intermediate bottle 206, and the air suction end of the sampling pump 202 is in communication with the connecting pipe 205; the air inlet connecting pipe 209 is provided with an air inlet valve 211, and the waste gas pipe 210 is provided with an air outlet valve 212.The rotary frame 102 is provided with a sampling bottle 213, which is adsorbed with the fixed magnet 119. The top of the sampling bottle 213 is rotatably connected with a valve rod 219. The upper end of the valve rod 219 is fixedly connected with a steel bottle valve 218. The upper end of the sampling bottle 213 is slidably provided with a valve piston 220. The lower end of the valve rod 219 is engagedly connected with the valve piston 220. The butt joint sliding pipe 203 comprises a front end pipe 214, a rear end pipe 215 and a front sliding rod 216. The rear end pipe 215 is fixedly connected with the synchronous sliding seat 118. The front end pipe 214 is slidably connected with the rear end pipe 215. The front end pipe 214 is slidably connected with the synchronous sliding seat 118. The front end pipe 214 is connected with the vertical front sliding rod 216. The front sliding rod 216 is slidably connected with the bevel sliding block 117 and the right angle sliding groove 120.

[0026] In specific use, the sampling bottle 213 is pre-evacuated to ensure that the gas is automatically sucked into the sampling bottle 213 during sampling. According to the number of sampling samples, the required number of sampling bottles 213 are installed on the rotating frame 102, and the sampling bottles 213 are adsorbed by the fixed magnet 119 and fixed by the rotating frame 102. Start sampling, first pre-evacuation operation, close the inlet valve 211 and the gas delivery valve 221, and open the exhaust valve 212. Start the exhaust cylinder 207, and the exhaust cylinder 207 is elongated to use the exhaust valve plate 208 to exhaust the residual gas in the intermediate bottle 206 through the exhaust pipe 210. The residual air is squeezed into the waste gas bottle 217. Then close the exhaust valve 212, shorten the exhaust cylinder 207 to drive the exhaust valve plate 208 to slide, and start the sampling pump 202 to exhaust the intermediate bottle 206. When the sampling pump 202 is exhausted, the gas in the intermediate bottle 206 is extracted through the connecting pipe 205, the inlet pipe 209 is connected to the gas collection pipe, the inlet valve 211 is opened, and the gas can be collected through the intermediate bottle 206. Perform gas collection operation, first transport sampling bottle 213, push arm 106 initial state is elongated state, start push arm 106, push arm 106 shortening drive gas bottle clamping seat 121 up, sampling bottle 213 bottom will be inserted into the gas bottle clamping seat 121 during the process of moving up, sampling bottle 213 moves up with the gas bottle clamping seat 121, when the top of the sampling bottle 213 contacts the magnetic trigger 111, the magnetic trigger 111 starts the electromagnet 112, the electromagnet 112 is attracted to each other to drive the magnetic clamp 115 to clamp the sampling bottle 213, at the same time, the release spring 113 is stretched by the magnetic clamp 115, and the push arm 106 is elongated, so that the gas bottle clamping seat 121 is separated from the sampling bottle 213;The sampling bottle 213 is started to be docked, the docking cylinder 116 is started, the docking cylinder 116 is elongated to push the bevel slide block 117 to slide, the bevel slide block 117 is pushed to slide to insert the front-end pipe 214 into the inlet of the sampling bottle 213, then the docking cylinder 116 continues to elongate to push the bevel slide block 117, the synchronous slide base 118, the magnetic attraction fastener 109 and the sampling bottle 213 to move together, in the moving process of the sampling bottle 213, the steel bottle valve 218 contacts the opening and closing rack 108, the edge of the steel bottle valve 218 is engaged with the opening and closing rack 108, the steel bottle valve 218 is rotated to drive the valve rod 219 to rotate together, the valve rod 219 is rotated to drive the valve piston 220 to move upwards, the sampling bottle 213 is communicated with the front-end pipe 214, at this time, the pressure in the sampling bottle 213 is less than that in the intermediate bottle 206, the gas inlet valve 221 is opened, the gas in the intermediate bottle 206 enters the sampling bottle 213 in turn through the connecting pipe 205, the rear-end pipe 215 and the front-end pipe 214, then the gas inlet valve 221 is closed, the docking cylinder 116 continues to contract to drive the bevel slide block 117, the synchronous slide base 118, the magnetic attraction fastener 109 and the sampling bottle 213 to move together, the edge of the steel bottle valve 218 is engaged with the opening and closing rack 108, the steel bottle valve 218 is rotated to drive the valve rod 219 to rotate together, the valve rod 219 is rotated to drive the valve piston 220 to move downwards, the gas inlet of the sampling bottle 213 is sealed, when the sampling bottle 213 moves to the lower side of the magnetic attraction trigger 111 again, the push arm 106 is contracted, the bottom of the sampling bottle 213 is inserted into the gas bottle clamping seat 121, and the electromagnet 112 is closed at the same time, the magnetic attraction clamp 115 is released by the spring 113 to release the sampling bottle 213, at this time, the sampling bottle 213 is fixed in the gas bottle clamping seat 121 by the gravity of the sampling bottle 213, moves together with the gas bottle clamping seat 121, the push arm 106 is elongated to transport the sampling bottle 213 to the rotary frame 102 below, the sampling bottle 213 is adsorbed by the fixed magnet 119, then the push arm 106 continues to elongate, the gas bottle clamping seat 121 is separated from the bottom of the sampling bottle 213, the replacement motor 104 is started, the rotary frame 102 and the replacement rotating shaft 103 are rotated together by the replacement motor 104, the sampling bottle 213 after the collection is rotated together with the rotary frame 102, and the new sampling bottle 213 is aligned with the gas bottle clamping seat 121 in the vertical direction; after the gas collection operation is completed, the exhaust valve 212 is opened, the exhaust cylinder 207 is elongated to push the residual gas in the intermediate bottle 206 into the waste gas bottle 217, and the waste gas collection can be completed.

[0027] The above is the specific working process of the present application, and the next time the step is repeated.

[0028] It is to be understood that the terminology "including", "comprising", or any other variation thereof, is intended to cover a non-exclusive inclusion such that process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0029] While the embodiments of the application have been illustrated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and alterations can be made therein without departing from the spirit and scope of the application.

[0030] The above description of the application and its embodiments is not restrictive, and the embodiments shown in the drawings are only one of the embodiments of the application, and the actual structure is not limited thereto. In general, if a person skilled in the art is inspired by it, without departing from the purpose of the application, without creative design, similar structure and embodiments of the technical solution can be designed, which should belong to the protection scope of the application.

Claims

1. A safe and environmentally friendly gas sampling device for chemical enterprises, characterized in that: The utility model provides external replacement mechanism (1) and gas collecting mechanism (2) including, gas collecting mechanism (2) is located external replacement mechanism (1) top, the docking assembly (105) is located in gas collecting mechanism (2), the docking assembly (105) includes docking frame (110), and docking frame (110) is located in gas collecting mechanism (2);The docking frame (110) is equipped with docking cylinder (116) in, the docking frame (110) is equipped with inclined angle sliding block (117) slidingly, and the telescopic end of docking cylinder (116) is fixedly connected with inclined angle sliding block (117), and the docking frame (110) is equipped with synchronous sliding seat (118);The docking frame (110) is equipped with right angle sliding groove (120) on, and the gas collecting mechanism (2) is equipped with gas collecting system (201) in, and the gas collecting system (201) includes docking sliding pipe (203), and the docking sliding pipe (203) includes front end pipe (214), rear end pipe (215) and front sliding rod (216), and rear end pipe (215) is fixedly connected with synchronous sliding seat (118), and front end pipe (214) is connected with rear end pipe (215) slidingly, and front end pipe (214) is connected with synchronous sliding seat (118) slidingly simultaneously, and front end pipe (214) is connected with the perpendicular front sliding rod (216) on, and front sliding rod (216) is connected with inclined angle sliding block (117) and right angle sliding groove (120) slidingly simultaneously.

2. The safety and environmental gas sampling device for chemical industry enterprise according to claim 1, characterized in that: The docking assembly (105) further 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 arranged in the gas collecting mechanism (2). The limiting groove (107) is arranged above the docking frame (110). The opening and closing rack (108) is arranged in the limiting groove (107). The magnetic fastener (109) is slidingly arranged in the docking frame (110). The magnetic trigger (111) is arranged above the limiting groove (107). The telescopic end of the push arm (106) is provided with a gas cylinder clamping seat (121).

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

4. The safety and environmental protection gas sampling device for chemical industry enterprise according to claim 3, characterized in that: The magnetic fastener (109) includes a magnetic carrying arm (114). The magnetic carrying arm (114) is in sliding connection with the docking frame (110). The docking frame (110) is rotatably provided with symmetrical magnetic clamping claws (115). The middle part of the magnetic clamping claw (115) is provided with an electromagnet (112). The symmetrical magnetic clamping claws (115) are connected with a release spring (113).

5. The safety and environmental protection gas sampling device for chemical industry enterprise according to claim 4, characterized in that: The bottom of the synchronous sliding seat (118) is fixedly connected with the magnetic carrying arm (114).

6. The safe and environment-friendly gas sampling device for chemical industry enterprises according to claim 5, characterized in that: The rotating frame (102) is provided with fixed magnets (119) arranged around the replacement rotating shaft (103).

7. The safe and environment-friendly gas sampling device for chemical industry enterprises according to claim 6, characterized in that: The gas sampling system (201) further comprises a sampling pump (202), a gas sampling frame (204), a connecting pipe (205), an intermediate bottle (206), an exhaust cylinder (207), an exhaust valve plate (208), an air inlet pipe (209), a waste pipe (210) and a waste gas bottle (217). The gas sampling frame (204) is arranged in the gas sampling mechanism (2), the sampling pump (202) is arranged at the top of the gas sampling frame (204), the intermediate bottle (206) is arranged in the middle of the gas sampling frame (204), the exhaust cylinder (207) is fixedly connected with the bottom of the intermediate bottle (206), the exhaust valve plate (208) is slidably arranged in the intermediate bottle (206), the exhaust valve plate (208) is fixedly connected with the telescopic end of the exhaust cylinder (207), the waste gas bottle (217) is arranged at the bottom of the gas sampling frame (204), the butt joint sliding pipe (203) is installed on the synchronous sliding seat (118), the butt joint sliding pipe (203) is communicated with the intermediate bottle (206) through the connecting pipe (205), the connecting pipe (205) is provided with a gas conveying valve (221), the air inlet pipe (209) is communicated with the top of the intermediate bottle (206), the waste pipe (210) is communicated with the waste gas bottle (217) and the intermediate bottle (206), and the gas suction end of the sampling pump (202) is communicated with the connecting pipe (205).

8. The safety and environmental gas sampling device for chemical industry enterprise according to claim 7, characterized in that: The air inlet pipe (209) is provided with an air inlet valve (211), and the waste pipe (210) is provided with an exhaust valve (212).

9. The safety and environmental gas sampling device for chemical industry according to claim 8, characterized in that: The rotating frame (102) is provided with a sampling bottle (213), the sampling bottle (213) and the fixed magnet (119) are mutually adsorbed, the top of the sampling bottle (213) is rotationally connected with a valve rod (219), the upper end of the valve rod (219) is fixedly connected with a steel bottle valve (218), the upper end of the sampling bottle (213) is slidably provided with a valve piston (220), and the lower end of the valve rod (219) is in meshing connection with the valve piston (220).

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