A laser gas analyzer

Abstract

The invention discloses a laser gas analyzer, which specifically relates to the technical field of laser gas analysis, and comprises a laser, wherein the laser emitting end of the laser is connected to a probe tube, a main probe and a sub-probe are arranged on one side of the probe tube, and the probe tube, the main probe and the sub-probe are all equipped with light windows at ports close to each other; a fixed disk is fixed on the outside of the probe tube, and a fixed tube is fixed on one side of the fixed disk; the invention divides a single probe of a traditional laser gas analysis into a probe tube part and a probe part, and adds an additional probe, and utilizes the rotation operation mode of the two probes to periodically compare the data collected by the two probes to avoid the singleness of the data source, and at the same time cooperates with the iron block inside the movable ring, the electromagnet inside the fixed ring, the arc block and the arc groove to ensure that the probe can be forcibly aligned with the probe tube part, so that the laser of the laser gas analysis can be accurately "emitted" and "reflected".

Description

Technical Field

[0001] The invention relates to the field of laser gas analysis, and in particular to a laser gas analyzer. Background Art

[0002] Laser gas analyzers are generally composed of lasers, optical systems, detectors, and data processing systems. The laser is used to generate a stable laser beam and is one of the core components of the laser gas analyzer. Its performance directly affects the measurement accuracy and stability of the instrument. The main function of the optical system is to focus and guide the laser beam to ensure that the laser can accurately pass through the sample gas and transmit the laser after being acted on by the gas to the detector. The detector is responsible for measuring the absorption of the laser in the sample, converting the optical signal into an electrical signal, and performing preliminary signal processing for subsequent data processing system analysis. The data processing system analyzes, processes, and calculates the electrical signal transmitted from the detector to obtain the results of gas composition and concentration, and can perform data storage, display, and transmission functions;

[0003] Currently, there are many types of laser gas analyzers, among which the most common is the probe-type laser gas analyzer, which is easy to use and simple to align. It only needs to be inserted into the pipeline of the gas to be tested. The fixing method is generally a flange connected to the pipeline to be tested. The traditional probe-type laser gas analyzer has only one probe, which is prone to wear during the process of monitoring gas data, resulting in errors in the gas data monitored by the probe. Summary of the invention

[0004] The object of the present invention is to provide a laser gas analyzer to solve the above-mentioned deficiencies in the technology.

[0005] In order to achieve the above object, the present invention provides the following technical solution: a laser gas analyzer, comprising a laser, wherein the laser emitting end of the laser is connected to a probe tube, a main probe and a sub-probe are arranged on one side of the probe tube, and the probe tube, the main probe and the sub-probe are all equipped with light windows at ports close to each other;

[0006] A fixing plate is fixed to the outside of the probe tube, a fixing tube is fixed to one side of the fixing plate, and a flange is installed on the side of the fixing tube away from the fixing plate;

[0007] An inner spacer and an outer spacer are fixed to the outside of the main probe and the auxiliary probe, the outer spacer is close to the flange, the inner spacer is located between the fixed plate and the outer spacer, and the inner spacer and the outer spacer can rotate inside the fixed pipe;

[0008] In the fixed tube, the space between the inner partition plate and the fixed disk forms a first sealed chamber, and the space between the outer partition plate and the inner partition plate forms a second sealed chamber. The first sealed chamber is in a vacuum state. The top of the fixed tube is connected to a gas nozzle for evacuating the first sealed chamber and a pressure gauge for monitoring the pressure value of the first sealed chamber. The outside of the fixed tube is connected to a second purge tube for injecting nitrogen into the second sealed chamber. The probe tube is connected to the first purge tube for injecting nitrogen on the side close to the laser.

[0009] The bottom of the fixed pipe is connected with a connection cover, the connection cover is communicated with the first sealing chamber, a gear ring is fixed to one side of the inner partition plate, a gear is arranged inside the connection cover, the gear is meshed and connected with the gear ring, a motor is installed on one side of the connection cover, and the transmission shaft of the motor extends inside the connection cover and is connected with the gear;

[0010] A controller is installed on one side of the fixed disk, and the motor is electrically connected to the controller.

[0011] Preferably, an observation window is provided on one side of the exterior of the fixed tube, through which the interior of the first sealed chamber can be observed. An LED lamp is provided inside the first sealed chamber, and the LED lamp is fixedly connected to the fixed tube.

[0012] Preferably, a bracket is fixed on one side of the fixed tube in the first sealed chamber, a cross bar is fixed on one side of the bracket, two movable blocks are symmetrically arranged on one side of the cross bar, one side of the two movable blocks are connected to a connecting block, rectangular holes are opened on both sides of the interior of the cross bar, the connecting block passes through the rectangular hole, and the connecting block can move inside the rectangular hole, a fixing rod is fixed on one side of the cross bar relative to the movable block, the fixing rod passes through the two connecting blocks, and a tension spring is sleeved on the outside of the fixing rod, and the two ends of the tension spring are respectively connected to the two connecting blocks;

[0013] A conductive sheet is provided in the middle of the movable block;

[0014] A U-shaped frame is fixed on one side opposite to the outside of the main probe and the auxiliary probe, an insulating tube is fixed on the U-shaped frame, a conductive rod is fixed inside the insulating tube, and both ends of the conductive rod extend to the outside of the insulating tube respectively.

[0015] Preferably, both ends of the conductive rod are spherical structures, and the top edge of the movable block is in an arc-shaped transition.

[0016] Preferably, a fixed ring is fixed on the outside of the probe tube facing the main probe, and the outside of the main probe and the auxiliary probe facing the probe tube are connected to movable rings through a rebound mechanism, an iron block is embedded inside the movable ring, and an electromagnet is embedded inside the fixed ring.

[0017] Preferably, the rebound mechanism includes a limiting ring, which is fixed to the outside of the main probe, and four limiting rods are arranged in a circular array inside the limiting ring, and the limiting rods pass through the limiting ring. One end of the limiting rod is connected to the movable ring, and the other end of the limiting rod is connected to the limiting disk. A spring is provided on the outside of the limiting rod and is located between the limiting ring and the limiting disk.

[0018] Preferably, arc blocks are provided on both sides of the fixed ring, arc grooves matching the arc blocks are provided on both sides of the movable ring, and the arc blocks and the fixed ring are an integrated structure.

[0019] Preferably, a connecting tube is connected to one side of the fixed tube, and the connecting tube is located outside the main probe and the auxiliary probe. A movable sleeve is provided outside the main probe and the auxiliary probe. Limiting strips are fixed to the outer walls of the main probe and the auxiliary probe along their length directions. A groove is provided on the inner wall of the sleeve along its length direction. The cross-sectional size of the groove matches the cross-sectional size of the limiting strip. A connecting rod is connected to one side of the sleeve, and a limiting wheel is installed outside the connecting rod. A guide groove with a sinusoidal structure is provided on the inner wall of the connecting tube, and the limiting wheel is located in the guide groove.

[0020] Preferably, retaining rings are fixed to the outsides of the ends of the main probe and the auxiliary probe, and a sealing gasket is provided on one side of the retaining ring.

[0021] In the above technical solution, the technical effects and advantages provided by the present invention are:

[0022] The present invention divides the single probe of the traditional laser gas analysis into a probe tube part and a probe part, and adds an additional probe. By using the two probes in a rotating operation mode, the data collected by the two probes can be periodically compared to avoid the singleness of the data source. At the same time, the iron block inside the movable ring, the electromagnet inside the fixed ring, the arc block and the arc groove can ensure that the probe can be forcibly aligned with the probe tube part, so that the laser of the laser gas analysis can be accurately "emitted" and "reflected".

[0023] The sleeves outside the two probes of the present invention are initially in a front-and-rear position. When the two probes exchange working states, the sleeves will be put on the probe in the standby state under the action of the limiting strip of the limiting wheel and the guide groove with a sinusoidal structure, so as to protect the laser reflection prism of the probe in the "standby state" at this time, avoid wear of the probe in the standby state, and greatly extend the service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is one of the structural schematic diagrams of the present invention;

[0026] Figure 2 This is the second structural schematic diagram of the present invention;

[0027] Figure 3 It is a cross-sectional view of the fixed pipe and the connecting pipe of the present invention;

[0028] Figure 4 A top view of the inner and outer partition plates of the present invention;

[0029] Figure 5 It is a structural schematic diagram of the connection between the probe tube and the main probe of the present invention;

[0030] Figure 6 This is a schematic diagram of the structure in which the top of the gear of the present invention extends to the interior of the fixed tube;

[0031] Figure 7 It is a structural schematic diagram of the connection cover of the present invention;

[0032] Figure 8 It is a schematic diagram of the structure when the conductive rod of the present invention is in contact with the conductive sheet;

[0033] Fig. 9 It is a schematic diagram of the structure when the fixed ring and the movable ring are in contact with each other;

[0034] Fig.10 It is a structural schematic diagram of the arc groove of the present invention;

[0035] Fig.11 It is a structural schematic diagram of the arc block of the present invention;

[0036] Fig.12 It is a schematic diagram of the structure of the connecting pipe after it is unfolded.

[0037] Description of reference numerals:

[0038] 1. Laser; 2. Controller; 3. Fixed plate; 4. Connecting pipe; 5. Flange; 6. Air nozzle; 7. Pressure gauge; 8. Observation window; 9. Main probe; 10. Auxiliary probe; 11. Guide groove; 12. Casing; 13. Retaining ring; 14. Sealing gasket; 15. Fixed pipe; 16. Probe; 17. First purge pipe; 18. Second purge pipe; 19. Motor; 20. Inner spacer; 21. Outer spacer; 22. Limit strip; 23. Connecting rod; 24. Limit wheel; 25. Gear ; 26. Fixed ring; 27. Movable ring; 28. Limiting ring; 29. ​​Cross bar; 30. Bracket; 31. LED lamp; 32. Movable block; 33. Insulating tube; 34. Conductive rod; 35. U-shaped frame; 36. Connecting block; 37. Rectangular hole; 38. Tension spring; 39. Conductive sheet; 40. Light window; 41. Limiting rod; 42. Spring; 43. Limiting plate; 44. Arc groove; 45. Iron block; 46. Arc block; 47. Electromagnet; 48. Gear ring; 49. Connecting cover. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0040] Embodiment 1:

[0041] The present invention provides Figure 1-Figure 12 A laser gas analyzer shown in the figure comprises a laser 1, a laser emitting end of the laser 1 is connected to a probe tube 16, a main probe 9 and a sub-probe 10 are arranged on one side of the probe tube 16, and light windows 40 are installed at ports close to each other of the probe tube 16, the main probe 9 and the sub-probe 10;

[0042] A fixing plate 3 is fixed to the outside of the probe tube 16, a fixing tube 15 is fixed to one side of the fixing plate 3, and a flange 5 is installed on the side of the fixing tube 15 away from the fixing plate 3;

[0043] The main probe 9 and the auxiliary probe 10 are fixed with an inner spacer 20 and an outer spacer 21 on their exteriors. The outer spacer 21 is close to the flange 5. The inner spacer 20 is located between the fixed plate 3 and the outer spacer 21. The inner spacer 20 and the outer spacer 21 can rotate inside the fixed tube 15; (the inner spacer 20 and the outer spacer 21 can be sealed with the fixed tube 15 while being able to rotate. The principle is similar to the sealing principle between the motor output shaft and the motor housing. This sealing principle is a prior art and will not be described in detail here);

[0044] In the fixed tube 15, the space between the inner partition plate 20 and the fixed disk 3 forms a first sealed chamber, and the space between the outer partition plate 21 and the inner partition plate 20 forms a second sealed chamber. The first sealed chamber is in a vacuum state. The top of the fixed tube 15 is connected to a gas nozzle 6 for evacuating the first sealed chamber and a barometer 7 for monitoring the pressure value of the first sealed chamber. The outside of the fixed tube 15 is connected to a second purge tube 18 for injecting nitrogen into the second sealed chamber. The probe tube 16 is connected to a first purge tube 17 for injecting nitrogen on the side close to the laser 1; (the "two" nitrogen purge tubes of the existing probe-type laser gas analyzer are connected at the position of the first purge tube 17 of the present invention, and their purge channels are both opened in the "wall" of the "probe" tube body, similar to opening a hole in the "tube wall" to form an airflow channel, but the "two-way" purge channels are bounded by the "light window" and do not interfere with each other. One way is "instrument end purge" and the other is "lens end purge". End purge", the present invention separates the probe from the "light window" part on the basis of the existing probe, because the two-way purge channel itself is bounded by the "light window", so it can be separated, but when separating, it is necessary to add an additional "light window", the separated probe, namely the "probe tube 16" and "main probe 9" in the present invention, and then an additional "auxiliary probe 10" is added for backup. Since the "instrument end purge" and "lens end purge" themselves are two-way channels, the present invention only retains the first purge tube 17 which is the same as the technical scheme of the "instrument end purge" in the prior art, and uses the second sealed chamber to realize "gas injection" into the airflow channels of the "main probe 9" and the "auxiliary probe 10" at the same time to perform "lens end purge". Since the airflow channels of the "main probe 9" and the "auxiliary probe 10" are prior art, their "air inlet holes" are not shown in the figure, which is common sense for people in this field and will not be repeated here);

[0045] A connecting cover 49 is connected to the bottom of the fixed tube 15, and the connecting cover 49 is communicated with the first sealing chamber. A gear ring 48 is fixed to one side of the inner partition plate 20. A gear 25 is arranged inside the connecting cover 49, and the gear 25 is meshed and connected with the gear ring 48. A motor 19 is installed on one side of the connecting cover 49, and the transmission shaft of the motor 19 extends into the interior of the connecting cover 49 and is connected to the gear 25; (the sealing principle between the connecting cover 49 and the transmission shaft of the motor 19 is similar to the sealing principle between the motor output shaft and the motor housing. This sealing principle is a prior art and will not be repeated here);

[0046] A controller 2 is installed on one side of the fixed disk 3 , and the motor 19 is electrically connected to the controller 2 .

[0047] Furthermore, an observation window 8 is provided on the outer side of the fixed tube 15, through which the internal situation of the first sealed chamber can be observed. An LED lamp 31 is provided inside the first sealed chamber, and the LED lamp 31 is fixedly connected to the fixed tube 15. The LED lamp 31 provides lighting for the interior of the first sealed chamber, so that the staff can observe the internal situation of the first sealed chamber through the observation window 8.

[0048] Further, a bracket 30 is fixed on one side of the fixed tube 15 in the first sealed chamber, a cross bar 29 is fixed on one side of the bracket 30, two movable blocks 32 are symmetrically arranged on one side of the cross bar 29, one side of the two movable blocks 32 are connected to a connecting block 36, rectangular holes are opened on both sides of the interior of the cross bar 29, the connecting block 36 passes through the rectangular hole, and the connecting block 36 can move inside the rectangular hole, a fixing rod 37 is fixed on one side of the cross bar 29 relative to the movable block 32, the fixing rod 37 passes through the two connecting blocks 36, and a tension spring 38 is sleeved on the outside of the fixing rod 37, and the two ends of the tension spring 38 are respectively connected to the two connecting blocks 36;

[0049] A conductive sheet 39 is provided in the middle of the movable block 32;

[0050] A U-shaped frame 35 is fixed on the opposite side of the main probe 9 and the auxiliary probe 10, and an insulating tube 33 is fixed on the U-shaped frame 35. A conductive rod 34 is fixed inside the insulating tube 33. Both ends of the conductive rod 34 extend to the outside of the insulating tube 33 respectively. The tension spring 38 can keep the two connecting blocks 36 moving toward each other at all times to ensure that the conductive sheet 39 can always be in stable contact with the conductive rod 34.

[0051] Furthermore, both ends of the conductive rod 34 are spherical structures, and the top edge of the movable block 32 is arc-shaped to reduce the wear of the conductive rod 34 on the conductive sheet 39 and facilitate the conductive rod 34 to be "pressed" between the two conductive sheets 39.

[0052] Furthermore, a fixed ring 26 is fixed to the outside of the probe tube 16 facing the main probe 9, and the outsides of the main probe 9 and the auxiliary probe 10 facing the probe tube 16 are connected to a movable ring 27 through a rebound mechanism, an iron block 45 is embedded in the movable ring 27, and an electromagnet 47 is embedded in the fixed ring 26.

[0053] Furthermore, the rebound mechanism includes a limit ring 28, which is fixed to the outside of the main probe 9. Four limit rods 41 are arranged in a circular array inside the limit ring 28. The limit rods 41 pass through the limit ring 28. One end of the limit rod 41 is connected to the movable ring 27, and the other end of the limit rod 41 is connected to the limit disk 43. A spring 42 is arranged outside the limit rod 41 and between the limit ring 28 and the limit disk 43.

[0054] Arc blocks 46 are provided on both sides of the fixed ring 26 , and arc grooves 44 matching the arc blocks 46 are provided on both sides of the movable ring 27 . The arc blocks 46 and the fixed ring 26 are an integrated structure.

[0055] Through the above technical solution:

[0056] When in use, the main probe 9 and the auxiliary probe 10 are simultaneously inserted into the pipeline of the gas to be measured, and then the device is fastened to the pipeline through the flange 5. During the gas monitoring process, when the gas to be measured passes through the pipeline, the laser 1 will emit a laser of a specific wavelength, and the laser will be divided into two paths by a spectroscope, one path goes to the "reference detector" inside the laser 1, and the other path passes through the light window 40 (in the present invention, there are two light windows 40, and the laser will pass through the light windows 40 of the "probe tube 16" and the "main probe 9" respectively), and then the laser will pass through the gas to be measured (as shown in the attached manual Figure 1-Figure 4 , the gas to be measured will pass through the "elliptical" air hole near the end of the "main probe 9", and after passing through the gas to be measured, it will be "parallel" reflected by the "reflection prism" inside the end of the "main probe 9", and will enter the "measurement detector" of the laser 1. The concentration change of the gas to be measured in the optical path will cause the change of the laser absorbance signal reaching the "measurement detector". According to the Beer-Lambert law, the gas concentration can be calculated. Since the temperature and pressure of the gas to be measured are usually not constant, in order to improve the accuracy, a temperature and pressure transmitter can also be installed on the pipeline for dynamic compensation;

[0057] After the probe (hereinafter the main probe 9 and the auxiliary probe 10 are referred to as "probe") has been working for a long time (the specific time can be set by yourself, that is, the controller 2 controls the working cycle of the motor 19), the controller 2 will control the motor 19 to drive the gear 25 to rotate, and then drive the gear ring 48 and the inner partition plate 20 to rotate as a whole, so that the two exchange positions. When the probe is docked with the probe tube 16, the two ends of the conductive rod 34 will contact the two conductive sheets 39 respectively, and then the LED lamp 31 and the electromagnet 47 start to work (it should be stated in advance that the LED lamp 31, the electromagnet 47, the conductive sheet 39 and the conductive rod 34 in the present invention are in a series state, wherein the conductive sheet 39 and the conductive rod 34 are equivalent to the "electric switch" or "switch" in the prior art. As long as the probe is docked with the probe tube 16, the "electric switch" can be converted to the "closed switch" state, and then the LED lamp 31 and the electromagnet 47 start to work);

[0058] During the operation of the electromagnet 47, the magnetic attraction generated by the electromagnet 47 will attract the iron block 45, and then attract and move the movable ring 27 in the direction of the fixed ring 26. Under the influence of the limiting rod 41, the movable ring 27 can only move in a straight line toward the fixed ring 26. When the movable ring 27 contacts the fixed ring 26, it is guided by the arc block 46 and the arc groove 44. When the movable ring 27 and the fixed ring 26 are further tightened, the probe will rotate as a whole, thereby forcibly ensuring that the probe is completely and tightly fitted with the probe tube 16, so that the laser of the laser gas analyzer can be accurately "emitted" and "reflected".

[0059] By rotating the two probes, on the one hand, the data collected by the two probes can be compared periodically to avoid the single source of data, which makes it easier for staff to judge whether the device needs maintenance. On the other hand, when the probe is worn by the gas inside the pipeline, resulting in deviations in the gas data, the spare probe can be temporarily replaced to deal with emergencies.

[0060] Embodiment 2:

[0061] Reference Figure 1-Figure 4 and Fig.12 A connecting tube 4 is connected to one side of the fixed tube 15, and the connecting tube 4 is located outside the main probe 9 and the auxiliary probe 10. A movable sleeve 12 is arranged outside the main probe 9 and the auxiliary probe 10. A limiting strip 22 is fixed to the outer wall of the main probe 9 and the auxiliary probe 10 along the length direction. A groove is provided on the inner wall of the sleeve 12 along the length direction. The cross-sectional size of the groove matches the cross-sectional size of the limiting strip 22. A connecting rod 23 is connected to one side of the sleeve 12. A limiting wheel 24 is installed outside the connecting rod 23. A guide groove 11 with a sinusoidal structure is provided on the inner wall of the connecting tube 4, and the limiting wheel 24 is located in the guide groove 11.

[0062] Furthermore, a retaining ring 13 is fixed to the outside of the ends of the main probe 9 and the auxiliary probe 10 , and a sealing gasket 14 is provided on one side of the retaining ring 13 .

[0063] Through the above technical solution:

[0064] Initially, the sleeves 12 on the main probe 9 and the auxiliary probe 10 are in a front-and-rear state, and the limiting wheel 24 on one side of the sleeve 12 is located in the guide groove 11. Therefore, when the main probe 9 and the auxiliary probe 10 rotate alternately, under the action of the limiting strip 22 and the guide groove 11 with a sinusoidal structure, the sleeve 12 outside the auxiliary probe 10 can be moved toward the inside of the connecting tube 4, and the sleeve 12 outside the main probe 9 can be moved toward the outside of the connecting tube 4. At this time, the auxiliary probe 10 is in a docking state with the probe tube 16, and the main probe 9 is in a "standby state". The main probe 9 in the "standby state" has its "elliptical" air vent through which the gas to be measured passes blocked by the sleeve 12. The retaining ring 13 and the sealing gasket 14 can further seal the sleeve 12 and the main probe 9 to protect the laser reflection prism of the main probe 9 in the "standby state" at this time, avoid wear of the main probe 9 in the standby state, and greatly extend the service life of the device.

[0065] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A laser gas analyzer, comprising a laser (1), characterized in that: The laser emitting end of the laser (1) is connected to a probe tube (16), a main probe (9) and a sub-probe (10) are arranged on one side of the probe tube (16), and light windows (40) are installed at ports close to each other on the probe tube (16), the main probe (9) and the sub-probe (10); A fixing plate (3) is fixed to the outside of the probe tube (16), a fixing tube (15) is fixed to one side of the fixing plate (3), and a flange (5) is installed on the side of the fixing tube (15) away from the fixing plate (3); An inner spacer (20) and an outer spacer (21) are fixed to the outside of the main probe (9) and the auxiliary probe (10), the outer spacer (21) is close to the flange (5), the inner spacer (20) is located between the fixed plate (3) and the outer spacer (21), and the inner spacer (20) and the outer spacer (21) can rotate inside the fixed tube (15); In the fixed tube (15), the space between the inner partition plate (20) and the fixed disk (3) forms a first sealed chamber, and the space between the outer partition plate (21) and the inner partition plate (20) forms a second sealed chamber, the first sealed chamber is in a vacuum state, the top of the fixed tube (15) is connected to a gas nozzle (6) for evacuating the first sealed chamber and a pressure gauge (7) for monitoring the pressure value of the first sealed chamber, the outside of the fixed tube (15) is connected to a second purge pipe (18) for injecting nitrogen into the second sealed chamber, and the probe tube (16) is connected to a first purge pipe (17) for injecting nitrogen on the side close to the laser (1); The bottom of the fixed tube (15) is connected with a connecting cover (49), the connecting cover (49) is communicated with the first sealing chamber, a gear ring (48) is fixed to one side of the inner partition plate (20), a gear (25) is arranged inside the connecting cover (49), the gear (25) is meshedly connected with the gear ring (48), a motor (19) is installed on one side of the connecting cover (49), and a transmission shaft of the motor (19) extends into the interior of the connecting cover (49) and is connected with the gear (25); A controller (2) is installed on one side of the fixed disk (3), and the motor (19) is electrically connected to the controller (2); A connecting tube (4) is connected to one side of the fixed tube (15), and the connecting tube (4) is located outside the main probe (9) and the auxiliary probe (10). A movable sleeve (12) is arranged outside the main probe (9) and the auxiliary probe (10). A limit strip (22) is fixed to the outer wall of the main probe (9) and the auxiliary probe (10) along the length direction thereof. A groove is provided on the inner wall of the sleeve (12) along the length direction thereof. The cross-sectional size of the groove matches the cross-sectional size of the limit strip (22). A connecting rod (23) is connected to one side of the sleeve (12), and a limit wheel (24) is installed outside the connecting rod (23). A guide groove (11) with a sinusoidal structure is provided on the inner wall of the connecting tube (4), and the limit wheel (24) is located in the guide groove (11).

2. A laser gas analyzer according to claim 1, characterized in that: An observation window (8) is provided on one side of the exterior of the fixed tube (15), through which the interior of the first sealed chamber can be observed. An LED lamp (31) is provided inside the first sealed chamber, and the LED lamp (31) is fixedly connected to the fixed tube (15).

3. A laser gas analyzer according to claim 1, characterized in that: A bracket (30) is fixed on one side of the fixed tube (15) in the first sealed chamber, a cross bar (29) is fixed on one side of the bracket (30), two movable blocks (32) are symmetrically arranged on one side of the cross bar (29), one side of the two movable blocks (32) are connected to a connecting block (36), rectangular holes are opened on both sides of the interior of the cross bar (29), the connecting block (36) passes through the rectangular hole, and the connecting block (36) can move inside the rectangular hole, a fixing rod (37) is fixed on one side of the cross bar (29) relative to the movable block (32), the fixing rod (37) passes through the two connecting blocks (36), and a tension spring (38) is sleeved on the outside of the fixing rod (37), and the two ends of the tension spring (38) are respectively connected to the two connecting blocks (36); A conductive sheet (39) is provided in the middle of the movable block (32); A U-shaped frame (35) is fixed on one side opposite to the outside of the main probe (9) and the auxiliary probe (10), an insulating tube (33) is fixed on the U-shaped frame (35), a conductive rod (34) is fixed inside the insulating tube (33), and two ends of the conductive rod (34) extend to the outside of the insulating tube (33) respectively.

4. A laser gas analyzer according to claim 3, characterized in that: Both ends of the conductive rod (34) are spherical structures, and the top edge of the movable block (32) is in an arc-shaped transition.

5. A laser gas analyzer according to claim 3, characterized in that: A fixed ring (26) is fixed on the side of the probe tube (16) facing the main probe (9), and a movable ring (27) is connected to the side of the main probe (9) and the auxiliary probe (10) facing the probe tube (16) via a rebound mechanism. An iron block (45) is embedded in the movable ring (27), and an electromagnet (47) is embedded in the fixed ring (26).

6. A laser gas analyzer according to claim 5, characterized in that: The rebound mechanism comprises a limit ring (28), wherein the limit ring (28) is fixed on the outside of the main probe (9), and four limit rods (41) are arranged in a circular array inside the limit ring (28), wherein the limit rod (41) passes through the limit ring (28), one end of the limit rod (41) is connected to the movable ring (27), and the other end of the limit rod (41) is connected to the limit disk (43), and a spring (42) is arranged outside the limit rod (41) and between the limit ring (28) and the limit disk (43).

7. A laser gas analyzer according to claim 6, characterized in that: Arc blocks (46) are provided on both sides of the fixed ring (26), arc grooves (44) matching the arc blocks (46) are provided on both sides of the movable ring (27), and the arc blocks (46) and the fixed ring (26) are an integrated structure.

8. A laser gas analyzer according to claim 1, characterized in that: A retaining ring (13) is fixed to the outside of the ends of the main probe (9) and the auxiliary probe (10), and a sealing gasket (14) is provided on one side of the retaining ring (13).

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