Multi-head gas analysis device

Abstract

The invention discloses a multi-head gas analysis device, and relates to the technical field of infrared gas analyzers, the multi-head gas analysis device comprises a sampling joint body, and the sampling joint body comprises a sampling tube, a threaded port, a double-head connecting tube, an upper steel ball and an upper spring. In the using process, through the structural arrangement that the multiple sets of sampling connector bodies are arranged on the side end edge of the infrared gas analyzer side by side, the sampling requirements of the multiple sets of sampling tank bodies can be met, and the number of to-be-detected samples and the detection efficiency are effectively improved; the establishment of a gas passage from the sampling tank body to the sampling pipe is controlled through gas pressure, so that the to-be-detected gas samples in the sampling tank body at multiple positions can be sequentially detected, and the gas samples in the sampling cavity can be uniformly and thoroughly discharged into the infrared gas analyzer to be detected; and the to-be-detected gas sample in the sampling cavity is isolated from the introduced high-pressure gas by the piston plate, so that the detection precision of the to-be-detected gas sample can be guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of infrared gas analyzers, in particular to a multi-head gas analysis device. Background Art

[0002] As an early online analysis technology, infrared gas analyzer has been widely used in chemical, steel, metallurgy, biochemistry, cement, biochemistry and other industries. The wide application of infrared analyzer has made it develop rapidly and is well received by users. Although infrared analyzer has many advantages, once the gas is interfered by the background, it will affect the detection effect of infrared analyzer.

[0003] Specifically, there are two main factors that make infrared gas analyzers susceptible to background interference. First, since the gas it detects usually includes a certain amount of dust particles, after long-term use, some dust particles will adhere to the light emitting surface of the light transmitter and the light receiving surface of the light receiver of the existing infrared gas analyzer. Undoubtedly, these dust particles will have a certain impact on the intensity of the transmitted light or scattered light, the pulse frequency, etc., thereby reducing the detection accuracy of the components in the gas and the content of each component. Second, when different gas samples need to be detected, there is cross-interference between different detection gases, mainly because the gas sample detected last time is still residual in the cavity, which will lead to inaccurate measurement results.

[0004] Therefore, in view of this, the existing structural deficiencies are studied and improved, and a multi-head gas analysis device is proposed. Summary of the invention

[0005] The object of the present invention is to provide a multi-head gas analysis device to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a multi-head gas analysis device, including a sampling connector body, the sampling connector body including a sampling tube, a threaded opening, a double-headed connecting pipe, an upper steel ball and an upper spring, a threaded opening is opened at the bottom end of the sampling tube, and a double-headed connecting pipe is arranged in the channel at the top of the threaded opening, and a limiting pin is fixed integrally on the outer edge of the top of the double-headed connecting pipe, an upper steel ball is built into the sampling tube, and an upper spring is elastically connected to the top of the upper steel ball, the end of the upper spring facing away from the upper steel ball is clamped with the boss on the inner wall of the sampling tube, and under the elastic force of the upper spring, the upper steel ball and the conical surface of the inner wall of the sampling tube are squeezed and sealed.

[0007] Furthermore, the top of the sampling tube is connected to a dust filter assembly, and the dust filter assembly includes a filter tube and a guide block. The filter tube is vertically connected to the top of the sampling tube, and a guide block is protruding and fixed on the inner wall of one side of the filter tube.

[0008] Furthermore, the dust filter assembly also includes an outer sleeve, and the inner wall on the other side of the filter tube is embedded with an outer sleeve, and the outer sleeve is arranged obliquely to the axis of the filter tube.

[0009] Furthermore, the dust filtering assembly also includes a filter cartridge and a rotary handle. The outer sleeve has a filter cartridge with a hollow structure built in it, and a rotary handle is fixed to the rear of the filter cartridge and is threadedly fastened to the outer sleeve.

[0010] Furthermore, the bottom of the sampling tube is externally connected to a sampling tank body, which includes a tank body and a threaded interface. The outer edge of the top opening of the tank body is provided with a threaded interface, and the tank body is threadedly fastened to the threaded port at the bottom of the sampling tube through the threaded interface at the top.

[0011] Furthermore, the sampling tank body also includes a sampling cavity, a lower steel ball and a lower spring. A sampling cavity with a "T"-shaped structure is opened inside the tank body, and a lower steel ball is arranged in the top space of the "T"-shaped structure of the sampling cavity. The bottom of the lower steel ball is elastically connected to a lower spring, and the elastic coefficient of the lower spring is smaller than that of the upper spring.

[0012] Furthermore, the sampling tank body also includes an air source interface and a magnetic perforated plate. The bottom side of the tank body is connected to the air source interface, and the top inner side of the air source interface is provided with a magnetic perforated plate fixed to the bottom end of the "T"-shaped structure of the sampling cavity.

[0013] Furthermore, the sampling tank body also includes a guide rod and a piston plate. The guide rod is fixedly connected to the top of the magnetic hole plate, and the guide rod is bent from the intersection of the "T"-shaped structure and fixed to the side wall of the sampling chamber. The piston plate is slidably mounted on the outside of the guide rod, and the piston plate is tightly fitted with the narrow part of the bottom end of the "T"-shaped structure of the sampling chamber, and the piston plate is flexibly fitted with the wide part of the top end of the "T"-shaped structure of the sampling chamber.

[0014] Furthermore, the sampling connector bodies are arranged in parallel at the side ends of the infrared gas analyzer, and a rim with a protruding outer edge is fixed to the top of the side ends of the infrared gas analyzer, and several independent pipelines connecting the sampling tube and the internal cavity of the infrared gas analyzer are arranged inside the rim.

[0015] Furthermore, a display screen is provided on one side of the front of the infrared gas analyzer, and function keys are arranged on the other side of the front of the infrared gas analyzer, an exhaust window is opened at the top of the back of the infrared gas analyzer, and a high-pressure gas tank is fixed with a buckle at the bottom end of the back of the infrared gas analyzer, and the output end of the high-pressure gas tank is connected to a connecting pipe through a valve body, and the connecting pipe is selectively connected to the corresponding tank body through a gas source interface.

[0016] The present invention provides a multi-head gas analysis device, which has the following beneficial effects: 1. During the use of the present invention, the present invention can meet the sampling needs of multiple groups of sampling tank bodies by arranging multiple groups of sampling connector bodies side by side on the side edge of the infrared gas analyzer, effectively improve the number of samples to be tested and the detection efficiency, and control the establishment of the gas passage from the sampling tank body to the sampling tube by air pressure. Before the detection, since the elastic coefficient of the lower spring of the present invention is smaller than the structural design of the upper spring, the passage from the top of the sampling tank body to the inside of the sampling tube has not been established at this time, so the multiple groups of sampling tank bodies are still in a state of waiting for detection at this time, and during the detection, the top of the "T"-shaped structure of the sampling cavity The pressure in the wide space at the end rises until it is greater than the elastic force applied by the upper spring to the upper steel ball. At this time, the passage at the bottom of the sampling tube is opened, and the gas sample in the sampling tank body can enter the internal cavity of the infrared gas analyzer through the sampling tube for gas analysis, which can ensure that the gas samples to be detected in multiple sampling tank bodies can complete sequential detection and make the gas samples in the sampling cavity evenly and thoroughly discharged into the infrared gas analyzer for detection. In addition, since the gas samples to be detected in the sampling cavity are isolated from the high-pressure gas introduced by the piston plate, the detection accuracy of the gas samples to be detected can be guaranteed; 2. During the use of the present invention, when the gas sample to be detected is passed into the sampling tube from the corresponding sampling tank body, before entering the internal cavity of the infrared gas analyzer, the present application connects a section of filter tube at the top of the sampling tube, and the entering gas sample is guided by the guide block into the filter cartridge embedded in the side wall of the filter tube to filter the dust particles mixed in the gas sample. The filter cartridge is threadedly connected to the outer opening of the outer sleeve through the rotary handle at the tail, which is convenient for cleaning and replacement, and effectively prevents the dust particles mixed in the gas sample from entering the internal cavity of the infrared gas analyzer to pollute the light emitter and thus reduce the detection accuracy. When the gas to be detected in the sampling cavity is exhausted, the piston plate is flipped at the bend of the guide rod, and the high-pressure gas introduced enters the wide space at the top of the "T"-shaped structure of the sampling cavity, and enters the internal cavity of the infrared gas analyzer through the gas passage between the sampling tank body and the sampling tube. Under the action of positive pressure, the gas sample that has been detected before is exhausted from the inside of the infrared gas analyzer, preventing the residual gas sample from affecting the subsequent detection, and further ensuring the continuous detection accuracy of multiple groups of gas samples to be detected. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall front structure of the device of the present invention; Figure 2 It is a schematic diagram of the overall rear view structure of the device of the present invention; Figure 3 This is a schematic diagram of the external structure of the sampling connector body and the sampling tank body of the present invention; Figure 4 This is a schematic diagram of the internal structure of the sampling connector body and the sampling tank body of the present invention; Figure 5 This is a schematic diagram of the sampling connector body structure of the present invention; Figure 6 This is a schematic diagram of the structure of the dust filter assembly of the present invention; Figure 7 This is a schematic diagram of the sampling tank body structure of the present invention.

[0018] In the figure: 1. Sampling connector body; 101. Sampling tube; 102. Threaded port; 103. Double-ended pipe; 104. Upper steel ball; 105. Upper spring; 2. Dust filter assembly; 201. Filter tube; 202. Guide block; 203. Outer sleeve; 204. Filter cartridge; 205. Rotary handle; 3. Sampling tank body; 301. Tank body; 302. Screw thread interface; 303. Sampling cavity; 304. Lower steel ball; 305. Lower spring; 306. Gas source interface; 307. Magnetic hole plate; 308. Guide rod; 309. Piston plate; 4. Infrared gas analyzer; 5. Edge; 6. Display screen; 7. Function key; 8. Exhaust window; 9. High-pressure gas tank; 10. Connecting pipe. DETAILED DESCRIPTION

[0019] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following embodiments are used to illustrate the present invention but are not intended to limit the scope of the present invention. See also Figures 1 to 7The present invention provides a technical solution: a multi-head gas analysis device, including a sampling joint body 1, the sampling joint body 1 includes a sampling tube 101, a threaded opening 102, a double-headed pipe 103, an upper steel ball 104 and an upper spring 105, the bottom end of the sampling tube 101 is provided with a threaded opening 102, and a double-headed pipe 103 is arranged in a channel at the top of the threaded opening 102, and a limit pin is fixed integrally on the outer edge of the top of the double-headed pipe 103, the sampling tube 101 is provided with an upper steel ball 104, and the top of the upper steel ball 104 is elastically connected to the upper spring 105 The upper spring 105 is connected to the inner wall boss of the sampling tube 101 at one end away from the upper steel ball 104, and the upper steel ball 104 is squeezed and sealed with the inner wall cone of the sampling tube 101 under the elastic force of the upper spring 105. The sampling tube 101 is connected to the sampling tank body 3 at the bottom. The sampling tank body 3 includes a tank body 301 and a screw thread interface 302. The outer edge of the top opening of the tank body 301 is provided with a screw thread interface 302, and the tank body 301 is threadedly fastened with the threaded port 102 at the bottom end of the sampling tube 101 through the screw thread interface 302 at the top. The sampling tank body 3 also includes a sampling tank body 301. The sampling chamber 303, the lower steel ball 304 and the lower spring 305 are provided inside the tank body 301. The sampling chamber 303 with a "T"-shaped structure is provided inside the top space of the "T"-shaped structure of the sampling chamber 303. The bottom of the lower steel ball 304 is elastically connected to the lower spring 305, and the elastic coefficient of the lower spring 305 is smaller than that of the upper spring 105. The sampling tank body 3 also includes an air source interface 306 and a magnetic suction hole plate 307. The bottom side of the tank body 301 is connected to the air source interface 306, and the top of the inner side of the air source interface 306 is provided with a fixed The sampling chamber 303 has a magnetic hole plate 307 at the bottom of the “T”-shaped structure. The sampling tank body 3 also includes a guide rod 308 and a piston plate 309. The top of the magnetic hole plate 307 is fixedly connected with the guide rod 308, and the guide rod 308 is bent from the intersection of the “T”-shaped structure and fixed to the side wall of the sampling chamber 303. The piston plate 309 is slidably sleeved on the outside of the guide rod 308, and the piston plate 309 is tightly matched with the narrow part of the bottom of the “T”-shaped structure of the sampling chamber 303, and the piston plate 309 is flexibly matched with the wide part of the top of the “T”-shaped structure of the sampling chamber 303. The specific operation is as follows: multiple groups of gas samples to be tested are stored in the corresponding sampling tank body 3, and under the elastic force of the lower spring 305, the lower steel ball 304 is tightly fitted with the conical surface of the inner wall of the top of the sampling cavity 303 to achieve sealing, so as to ensure the airtightness of the sampling tank body 3 after sampling is completed. Before testing, the tank body 301 is threadedly fastened with the threaded port 102 at the bottom of the sampling tube 101 through the screw thread interface 302 at the top to achieve connection. During this process, the double-headed pipe 103 in the middle of the threaded port 102 overcomes the elastic force of the lower spring 305 and squeezes the lower steel ball 304 to open the sampling cavity 30 3, however, due to the structural design that the elastic coefficient of the lower spring 305 of the present application is smaller than that of the upper spring 105, the passage from the top of the sampling tank body 3 to the inside of the sampling tube 101 has not been established at this time, so at this time, the multiple groups of sampling tank bodies 3 are still in a waiting state. During the inspection, when it is necessary to sample and inspect the gas samples in the corresponding sampling tank bodies 3, the user inserts the connecting tube 10 at the output end of the high-pressure gas tank 9 onto the gas source interface 306 on the bottom side of the corresponding sampling tank body 3, opens the valve to allow the high-pressure gas to enter from the space below the magnetic suction orifice plate 307, and Under the action of pressure, the piston plate 309 and the narrow channel at the bottom of the "T"-shaped structure of the sampling chamber 303 are lifted up. The lifting process of the piston plate 309 is guided and limited by the "L"-shaped structure guide rod 308 to prevent the piston plate 309 from impacting the lower spring 305 during the lifting process. At this time, the pressure in the wide space at the top of the "T"-shaped structure of the sampling chamber 303 rises until it is greater than the elastic force applied by the upper spring 105 to the upper steel ball 104. At this time, the bottom passage of the sampling tube 101 is opened, and the gas sample in the sampling tank body 3 can enter the inner part of the infrared gas analyzer 4 through the sampling tube 101. The gas analysis is performed in the inner cavity of the sampling chamber 303. When the gas to be detected in the sampling chamber 303 is exhausted, the piston plate 309 is turned over at the bend of the guide rod 308, and the high-pressure gas enters the wide space at the top of the "T"-shaped structure of the sampling chamber 303, and enters the inner cavity of the infrared gas analyzer 4 through the gas passage between the sampling tank body 3 and the sampling tube 101. Under the action of positive pressure, the gas sample that has been tested before is exhausted from the inside of the infrared gas analyzer 4, preventing the residual gas sample from affecting the subsequent detection, and further ensuring the continuous detection accuracy of multiple groups of gas samples to be detected; See also Figures 5 and 6The top of the sampling tube 101 is connected to a dust filter assembly 2, which includes a filter tube 201 and a guide block 202. The filter tube 201 is vertically connected to the top of the sampling tube 101, and the guide block 202 is fixed on the inner wall of one side of the filter tube 201. The dust filter assembly 2 also includes an outer sleeve 203, and the inner wall of the other side of the filter tube 201 is embedded with an outer sleeve 203, and the outer sleeve 203 is inclined to the axis of the filter tube 201. The dust filter assembly 2 also includes a filter cartridge 204 and a rotary handle 205. The outer sleeve 203 has a hollow filter cartridge 204 built in, and the rear of the filter cartridge 204 is fixed with a rotary handle 205 threadedly fastened to the outer sleeve 203; The specific operation is as follows: when the gas sample to be detected is passed into the sampling tube 101 from the corresponding sampling tank body 3, before entering the internal cavity of the infrared gas analyzer 4, the present application connects a filter tube 201 at the top of the sampling tube 101, and the entering gas sample is guided by the guide block 202 to enter the filter cartridge 204 embedded in the side wall of the filter tube 201, and the dust particles mixed in the gas sample are filtered. The filter cartridge 204 is threadedly connected to the outer opening of the outer sleeve 203 through the rotary handle 205 at the tail, which is convenient for cleaning and replacement, and effectively prevents the dust particles mixed in the gas sample from entering the internal cavity of the infrared gas analyzer 4 to pollute the light emitter and thus reduce the detection accuracy; See also Figure 1 to Figure 2 , the sampling connector body 1 is arranged in parallel at the side end of the infrared gas analyzer 4, and the top of the side end of the infrared gas analyzer 4 is fixed with an edge 5 with a protruding outer edge, and the edge 5 is provided with several independent pipelines connecting the sampling tube 101 and the internal cavity of the infrared gas analyzer 4, a display screen 6 is provided on one side of the front of the infrared gas analyzer 4, and function keys 7 are arranged on the other side of the front of the infrared gas analyzer 4, an exhaust window 8 is provided on the top of the back of the infrared gas analyzer 4, and a high-pressure gas tank 9 is fixed with a buckle at the bottom of the back of the infrared gas analyzer 4, and the output end of the high-pressure gas tank 9 is connected with a connecting pipe 10 through a valve body, and the connecting pipe 10 is selectively connected with the corresponding tank body 301 through a gas source interface 306; The specific operation is as follows: the present application can meet the sampling requirements of multiple groups of sampling tank bodies 3 by arranging a plurality of sampling connector bodies 1 side by side on the side edge 5 of the infrared gas analyzer 4, effectively improving the number of samples to be detected and the detection efficiency, and by controlling the establishment of the gas passage from the sampling tank body 3 to the sampling tube 101 through air pressure, it can ensure that the gas samples to be detected in multiple sampling tank bodies 3 can complete sequential detection and the gas samples in the sampling cavity 303 can be evenly and thoroughly discharged into the infrared gas analyzer 4 to complete the detection, and because the gas samples to be detected in the sampling cavity 303 are isolated from the introduced high-pressure gas by the piston plate 309, the detection accuracy of the gas samples to be detected can be guaranteed; It is worth adding that the infrared gas analyzer 4 used in this application is model JC-3017HF, and this application follows the detection method and principle of this type of infrared gas analyzer 4, specifically: using infrared rays as light sources, and detecting the concentration of the gas by measuring the amount of infrared light absorbed by the gas. The instrument contains two independent light sources, each generating two beams of infrared rays, which are converted into 5Hz rays after passing through the modulator. One beam of rays passes through the measured gas chamber (measurement chamber), and the other passes through the background gas chamber (reference chamber). When the concentration of the measured gas changes, the amount of infrared light absorbed in the measurement chamber will change, while the amount of light in the reference chamber remains unchanged. By detecting the difference in light intensity between the two chambers, the concentration of the gas can be calculated. In addition, the existing technology has been mature and widely used, and this application does not elaborate on it.

[0020] In summary, when using the multi-head gas analysis device, multiple groups of gas samples to be tested are stored in the corresponding sampling tank body 3, and under the elastic force of the lower spring 305, the lower steel ball 304 is tightly fitted with the conical surface of the inner wall of the top of the sampling cavity 303 to achieve sealing, so as to ensure the airtightness of the sampling tank body 3 after sampling is completed. Before testing, the tank body 301 is threadedly fastened with the threaded port 102 at the bottom of the sampling tube 101 through the screw thread interface 302 at the top to achieve connection. During this process, the double-headed pipe 103 in the middle of the threaded port 102 overcomes the elastic force of the lower spring 305 and squeezes the lower steel ball 304 to open the gas passage at the top of the sampling cavity 303. However, due to the structural design that the elastic coefficient of the lower spring 305 of the present application is smaller than that of the upper spring 105, so that at this time, the sampling The passage from the top of the sample tank body 3 to the inside of the sampling tube 101 has not been established yet, so at this time, multiple groups of sampling tank bodies 3 are still in a waiting state. During the inspection, when it is necessary to sample and inspect the gas sample in the corresponding sampling tank body 3, the user inserts the connecting tube 10 at the output end of the high-pressure gas tank 9 onto the gas source interface 306 on the bottom side of the corresponding sampling tank body 3, opens the valve to allow high-pressure gas to enter from the space below the magnetic perforated plate 307, and under the action of air pressure, lifts the piston plate 309 in the narrow channel at the bottom end of the "T"-shaped structure of the sampling chamber 303. The lifting process of the piston plate 309 is guided and restricted by the "L"-shaped structure guide rod 308, so as to prevent the piston plate 309 from impacting the lower spring 305 during the lifting process. At this time, the "T"-shaped sampling chamber 303 The pressure in the wide space at the top of the structure rises until it is greater than the elastic force applied by the upper spring 105 to the upper steel ball 104. At this time, the bottom passage of the sampling tube 101 is opened, and the gas sample in the sampling tank body 3 can enter the internal cavity of the infrared gas analyzer 4 through the sampling tube 101 for gas analysis. The present application can meet the sampling needs of multiple groups of sampling tank bodies 3 by arranging multiple groups of sampling connector bodies 1 side by side on the side edge 5 of the infrared gas analyzer 4, effectively improve the number of samples to be tested and the detection efficiency, and control the establishment of the gas passage from the sampling tank body 3 to the sampling tube 101 by air pressure, so as to ensure that the gas samples to be tested in multiple sampling tank bodies 3 can complete sequential detection and make the gas samples in the sampling cavity 303 The gas sample to be detected is evenly and thoroughly discharged into the infrared gas analyzer 4 to complete the detection, and because the gas sample to be detected in the sampling chamber 303 is isolated from the introduced high-pressure gas by the piston plate 309, the detection accuracy of the gas sample to be detected can be guaranteed. When the gas sample to be detected is passed into the sampling tube 101 from the corresponding sampling tank body 3, before entering the internal cavity of the infrared gas analyzer 4, the present application connects a filter tube 201 at the top of the sampling tube 101, and the entering gas sample is guided by the guide block 202 to enter the filter cartridge 204 embedded in the side wall of the filter tube 201 to filter the mixed dust particles in the gas sample. The filter cartridge 204 is threadedly connected to the outer opening of the outer sleeve 203 through the rotary handle 205 at the tail, which is convenient for cleaning and replacement.It effectively prevents dust particles mixed in the gas sample from entering the inner cavity of the infrared gas analyzer 4 and causing pollution to the light emitter, thereby reducing the detection accuracy. When the gas to be detected in the sampling cavity 303 is exhausted, the piston plate 309 is flipped at the bend of the guide rod 308, and the high-pressure gas enters the wide space at the top of the "T"-shaped structure of the sampling cavity 303, and enters the inner cavity of the infrared gas analyzer 4 through the gas passage between the sampling tank body 3 and the sampling tube 101. Under the action of positive pressure, the gas sample that has been tested before is exhausted from the infrared gas analyzer 4, preventing the residual gas sample from affecting the subsequent detection, and further ensuring the continuous detection accuracy of multiple groups of gas samples to be detected.

[0021] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various implementations with various modifications suitable for specific uses.

Claims

1. A multi-head gas analysis device, comprising a sampling connector body (1), characterized in that: The sampling connector body (1) comprises a sampling tube (101), a threaded opening (102), a double-ended pipe (103), an upper steel ball (104) and an upper spring (105); the sampling tube (101) has a threaded opening (102) at the bottom end, and a double-ended pipe (103) is arranged in a channel at the top of the threaded opening (102); an integrally fixed limit pin is arranged at the outer edge of the top of the double-ended pipe (103); the sampling tube (101) has an upper steel ball (104) built in, and an upper spring (105) is elastically connected to the top of the upper steel ball (104); an end of the upper spring (105) facing away from the upper steel ball (104) is clamped with a boss on the inner wall of the sampling tube (101), and under the elastic force of the upper spring (105), the upper steel ball (104) and the conical surface of the inner wall of the sampling tube (101) are squeezed and sealed.

2. A multi-head gas analysis device according to claim 1, characterized in that: The top of the sampling tube (101) is connected to a dust filter assembly (2), the dust filter assembly (2) comprising a filter tube (201) and a guide block (202), the filter tube (201) being vertically connected to the top of the sampling tube (101), and a guide block (202) is protruding and fixed on the inner wall of one side of the filter tube (201).

3. A multi-head gas analysis device according to claim 2, characterized in that: The dust filter assembly (2) further comprises an outer sleeve (203), the inner wall of the other side of the filter tube (201) being embedded with the outer sleeve (203), and the outer sleeve (203) being arranged obliquely to the axis of the filter tube (201).

4. A multi-head gas analysis device according to claim 3, characterized in that: The dust filter assembly (2) further comprises a filter cartridge (204) and a rotary handle (205); the outer sleeve (203) has a filter cartridge (204) with a hollow structure built into it, and a rotary handle (205) is fixed to the rear of the filter cartridge (204) and is threadedly fastened to the outer sleeve (203).

5. The multi-head gas analysis device according to claim 1, characterized in that: The bottom of the sampling tube (101) is externally connected to a sampling tank body (3), and the sampling tank body (3) comprises a tank body (301) and a screw thread interface (302). The outer edge of the top opening of the tank body (301) is provided with a screw thread interface (302), and the tank body (301) is threadedly fastened to the threaded opening (102) at the bottom end of the sampling tube (101) through the screw thread interface (302) at the top end.

6. A multi-head gas analysis device according to claim 5, characterized in that: The sampling tank body (3) further comprises a sampling cavity (303), a lower steel ball (304) and a lower spring (305); a sampling cavity (303) in a "T"-shaped structure is provided inside the tank body (301); a lower steel ball (304) is provided in the top space of the "T"-shaped structure of the sampling cavity (303); a lower spring (305) is elastically connected to the bottom of the lower steel ball (304); and the elastic coefficient of the lower spring (305) is smaller than that of the upper spring (105).

7. A multi-head gas analysis device according to claim 6, characterized in that: The sampling tank body (3) further comprises an air source interface (306) and a magnetic perforated plate (307); the bottom side of the tank body (301) is connected to the air source interface (306), and the top inner side of the air source interface (306) is provided with a magnetic perforated plate (307) fixed to the bottom end of the "T"-shaped structure of the sampling cavity (303).

8. A multi-head gas analysis device according to claim 7, characterized in that: The sampling tank body (3) further comprises a guide rod (308) and a piston plate (309); the guide rod (308) is fixedly connected to the top of the magnetic hole plate (307), and the guide rod (308) is bent from the intersection of the "T"-shaped structure and fixed to the side wall of the sampling cavity (303); the piston plate (309) is slidably sleeved on the outside of the guide rod (308), and the piston plate (309) is tightly matched with the narrow part of the bottom end of the "T"-shaped structure of the sampling cavity (303), and the piston plate (309) is movably matched with the wide part of the top end of the "T"-shaped structure of the sampling cavity (303).

9. The multi-head gas analysis device according to claim 1, characterized in that: The sampling connector body (1) is arranged in parallel at the side end of the infrared gas analyzer (4), and a rim (5) with a protruding outer edge is fixed to the top of the side end of the infrared gas analyzer (4), and a plurality of independent pipelines connecting the sampling tube (101) and the internal cavity of the infrared gas analyzer (4) are arranged inside the rim (5).

10. A multi-head gas analysis device according to claim 9, characterized in that: A display screen (6) is provided on one side of the front of the infrared gas analyzer (4), and function keys (7) are arranged on the other side of the front of the infrared gas analyzer (4). An exhaust window (8) is provided at the top of the back of the infrared gas analyzer (4), and a high-pressure gas tank (9) is fixed to the bottom of the back of the infrared gas analyzer (4) by a buckle. The output end of the high-pressure gas tank (9) is connected to a connecting pipe (10) through a valve body, and the connecting pipe (10) is selectively connected to a corresponding tank body (301) through a gas source interface (306).

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