System and method for positioning smoke suction hole of air suction type sampling pipe

Abstract

The invention relates to a system and a method for positioning a smoke suction hole of an air suction type sampling pipe in the field of measurement, and the method comprises the steps: monitoring the flow velocity of airflow in a main sampling pipe and an auxiliary sampling pipe in real time through a flow velocity sensor arranged at the end part of the sampling pipe, and enabling smoke to flow in the sampling pipe at a constant flow velocity in cooperation with a first fan and a second fan; meanwhile, the smoke movement distance is calculated through simultaneous movement distance equations of smoke in the main sampling pipe and the auxiliary sampling pipe, a traditional sampling hole smoke discharging test calibration method is replaced, the work amount is reduced, and better adaptability is achieved; in addition, by arranging a calibration mechanism, the sampling pipe and the sampling hole are subjected to back flushing cleaning, and the accuracy of sampling hole positioning is further improved.

Description

Technical Field

[0001] The invention relates to a smoke sampling hole positioning system, in particular to a smoke suction hole positioning system and method for an air suction sampling tube applied in the measurement field. Background Art

[0002] Air samples are extracted through the pipeline system for monitoring, replacing the traditional method of installing smoke sensors in each monitoring area. This effectively reduces the cost of fire monitoring and improves the timeliness of early warning. However, the positioning accuracy of this method is relatively limited. Therefore, improving the positioning accuracy of the smoke sampling hole is of great significance for accurately determining the location of the fire point.

[0003] The existing Chinese patent with publication number CN112525626A discloses a precise positioning system and method for abnormal positions of pipeline suction air sampling. The patent discloses that the method is divided into two stages: engineering debugging and precise positioning. In the engineering debugging stage, the sampling holes are numbered and the gas flow rate in the tube is set; the calibrated alarm time difference is obtained and stored; in the precise positioning stage, the actual alarm time difference is tested. Since the alarm time difference has a relatively fixed corresponding relationship with the length of the detection cavity pipeline, the actual tested alarm time difference is compared with the calibrated alarm time difference. If the actual alarm time difference is closest to the calibrated time difference of a certain hole, it proves that an abnormality has occurred near the certain sampling hole.

[0004] However, the technical solution of the above patent requires that each sampling hole be tested for smoke at the construction site first, and the detection time difference of each pair of sampling holes be calibrated. The pipeline length of hundreds of meters requires on-site testing and calibration of dozens of air intake holes, which is a huge project and requires very high professional skills of personnel. Summary of the invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the existing positioning system of smoke sampling holes requires smoke release test calibration for each sampling hole, which is cumbersome and labor-intensive.

[0006] In order to solve the above problems, the present invention provides a system and method for positioning the smoke suction hole of an air suction sampling tube, the positioning system comprising a positioning device; the positioning device comprising a main sampling tube and a secondary sampling tube arranged in parallel, the left side of the main sampling tube is connected with a first detection tube and a first fan in sequence, and the main sampling tube is provided with main sampling holes distributed equidistantly; the left side of the secondary sampling tube is fixedly connected with a second detection tube and a second fan in sequence, and the secondary sampling tube is provided with a secondary sampling hole arranged opposite to the main sampling hole; the first detection tube is fixedly connected with a first smoke sensor, the second detection tube is fixedly connected with a second smoke sensor, the main sampling tube is fixedly connected with a first flow velocity sensor at one end close to the first detection tube, and the secondary sampling tube is fixedly connected with a second flow velocity sensor at one side close to the second detection tube;

[0007] The positioning device also includes a controller, which is equipped with a control system. The control system includes a control module. The input end of the control module is respectively connected to the smoke monitoring module and the flow rate monitoring module, the input end of the smoke monitoring module is respectively connected to the first smoke sensor and the second smoke sensor, and the input end of the flow rate monitoring module is respectively connected to the first flow rate sensor and the second flow rate sensor; the output end of the control module is respectively connected to the flow rate regulation module, the timing module, and the positioning calculation module, and the output end of the flow rate regulation module is respectively connected to the first fan and the second fan.

[0008] In the above-mentioned air suction sampling tube smoke inhalation hole positioning system, the smoke inlet sampling hole is positioned by acquiring the speed difference between two streams of smoke and the triggering time difference of the smoke sensor.

[0009] As a further improvement of the present application, the positioning system also includes a calibration mechanism, which includes a connecting tube fixedly sleeved on the right ends of the main sampling tube and the auxiliary sampling tube, a pair of end covers for sealing the right end openings of the main sampling tube and the auxiliary sampling tube are provided in the connecting tube, the pair of end covers are fixedly connected to each other and the right ends of both are fixedly connected to the same electric telescopic rod, and the electric telescopic rod is fixedly connected to the inner wall of the connecting tube; the connecting tube is connected to a dust collecting tube, and a filter screen is fixedly connected to the outer wall of the dust collecting tube; both the first fan and the second fan are bidirectional fans.

[0010] As a further improvement of the present application, the calibration mechanism also includes a pair of cleaning components respectively arranged in the main sampling tube and the auxiliary sampling tube, the cleaning component includes a fixed ring arranged on the right side of the main sampling hole, the fixed ring is fixedly connected to a sliding rod, the sliding rod is slidably connected to a sealing ring arranged on the left side of the main sampling hole, the sealing ring is used to seal the sampling hole, a central column is provided at the center position of the sealing ring, the central column is fixedly connected to the inner wall of the sealing ring through support columns distributed in a circle, the central column is fixed with a traction rope distributed along the central axis of the main sampling tube, the right end of the traction rope is fixedly connected to the end cover, the left end of the traction rope is fixedly connected to a limit plate, a limit rod fixedly connected to the inner wall of the main sampling tube is provided on the right side of the limit plate, the traction rope passes through the limit rod and is slidably connected to the limit rod, and a spring sleeved on the traction rope is provided between the limit plate and the limit rod.

[0011] As a further improvement of the present application, a dredging assembly is provided on the sealing ring, and the dredging assembly includes a dredging rod arranged opposite to the sampling hole, the dredging rod is radially slidably connected to the sealing ring, the upper end of the dredging rod is sleeved with a rotating cylinder rotatably connected to the dredging rod, the rotating cylinder is rotatably connected to the support column, the upper end of the dredging rod is fixedly connected to a sliding column, the inner wall of the rotating cylinder is provided with an elliptical guide groove, and the outer wall of the rotating cylinder is fixedly connected to blades distributed in a circle.

[0012] As a further improvement of the present application, the dredging rod includes a cylindrical rod, a square rod is fixedly connected to the lower end of the cylindrical rod, a conical block is fixedly connected to the lower end of the square rod, the rotating cylinder is provided with a columnar cavity for the cylindrical rod to slide, the inner wall of the sealing ring is provided with a square hole for the square rod to insert, and the outer wall of the sealing ring is provided with a columnar hole connected to the square hole.

[0013] As a further improvement of the present application, both the fixing ring and the sealing ring are annular structures, and a conical surface is provided on the side of the sealing ring away from the fixing ring.

[0014] A method for positioning a smoke suction hole of an air suction sampling tube, using the above-mentioned smoke suction hole positioning system of an air suction sampling tube, comprises the following steps during positioning:

[0015] Step 1, start the first fan and the second fan, so that the two air flows in the main sampling pipe and the auxiliary sampling pipe flow at a constant flow rate, wherein the air flow rate in the main sampling pipe is V1, the air flow rate in the auxiliary sampling pipe is V2, and V1>V2 is set;

[0016] Step 2: When a fire occurs and smoke is generated, the smoke enters the main sampling tube and the auxiliary sampling tube from the main sampling hole and the auxiliary sampling hole closest to the fire point respectively. When the first smoke sensor detects smoke, the timing module records the triggering time T1 of the first smoke sensor. When the second smoke sensor detects smoke, the timing module records the triggering time T2 of the second smoke sensor.

[0017] Step 3: The positioning calculation module calculates the position of the smoke sampling hole, including the following sub-steps:

[0018] S1, define the distance between the smoke sampling hole and the detection tube as L, the time when the smoke enters the sampling hole as T0, and the equation for the smoke moving distance in the main sampling tube is L = (T1-T0)*V1 and the equation for the smoke moving distance in the auxiliary sampling tube is L = (T2-T0)*V2;

[0019] S2, combine the two equations in S1 to obtain L = (T2-T1)*V1*V2 / (V1-V2), substitute the values ​​of T1, T2, V1, and V2 in steps 1 and 2 to obtain the value of L.

[0020] In summary, the present invention monitors the air flow velocity in the main sampling tube and the auxiliary sampling tube in real time by means of a flow velocity sensor arranged at the end of the sampling tube, and cooperates with the first fan and the second fan to make the smoke flow at a constant flow velocity in the sampling tube, thereby improving the accuracy of detection. At the same time, the smoke movement distance is calculated by combining the smoke movement distance equation in the main sampling tube and the auxiliary sampling tube, thereby replacing the traditional sampling hole smoke release test calibration method, reducing the amount of engineering work and having better adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the positioning device in this application;

[0022] Figure 2 This is a module diagram of the control system in this application;

[0023] Figure 3 This is a schematic diagram of the flow of smoke in the sampling tube in this application;

[0024] Figure 4 This is a schematic diagram of the installation of the calibration device in the sampling tube in this application;

[0025] Figure 5 for Figure 4 A schematic diagram of the enlarged structure at A in the middle;

[0026] Figure 6 for Figure 4 A schematic diagram of the enlarged structure at B in the middle;

[0027] Figure 7 This is a schematic diagram of the three-dimensional structure of the blocking ring in this application;

[0028] Figure 8 This is a schematic diagram of the longitudinal cross-sectional structure of the blocking ring in this application;

[0029] Fig. 9 It is a schematic diagram of the assembly of the dredging rod and the rotating cylinder in this application;

[0030] Fig.10 It is a schematic diagram of the three-dimensional structure of the dredging rod in this application.

[0031] Description of the numbers in the figure:

[0032] 1. Main sampling tube; 101. Main sampling hole; 2. Auxiliary sampling tube; 201. Auxiliary sampling hole; 3. First detection tube; 4. First smoke sensor; 5. First fan; 6. First flow rate sensor; 7. Second detection tube; 8. Second smoke sensor; 9. Second fan; 10. Second flow rate sensor; 11. Connecting tube; 12. Dust collecting tube; 13. End cover; 14. Electric telescopic rod; 15. Traction rope; 16. Cleaning assembly; 17. Fixed ring; 18. Sliding rod; 19. Blocking ring; 1901. Square hole; 1902. Columnar hole; 20. Center column; 21. Support column; 22. Rotating cylinder; 2201. Guide groove; 23. Blade; 24. Clearing rod; 2401. Cylindrical rod; 2402. Square rod; 2403. Conical block; 25. Sliding column; 26. Limit plate; 27. Limit rod; 28. Spring. DETAILED DESCRIPTION

[0033] The following describes two implementation modes of the present application in detail with reference to the accompanying drawings.

[0034] The first implementation method:

[0035] Figure 1-3 A suction sampling tube smoke inhalation hole positioning system is shown, including a positioning device; the positioning device includes a main sampling tube 1 and a secondary sampling tube 2 arranged in parallel, the left side of the main sampling tube 1 is connected with a first detection tube 3 and a first fan 5 in sequence, and the main sampling tube 1 is provided with main sampling holes 101 distributed equidistantly, and the indoor airflow enters the main sampling tube 1 through the main sampling hole 101 through the first fan 5, and then flows through the first detection tube 3 and the first fan 5 in sequence before being discharged; the left side of the secondary sampling tube 2 is fixedly connected with a second detection tube 7 and a second fan 9 in sequence, and the secondary sampling tube 2 is provided with a secondary sampling hole 201 arranged opposite to the main sampling hole 101; the first detection tube 3 is fixedly connected with a first smoke sensor 4, the second detection tube 7 is fixedly connected with a second smoke sensor 8, the main sampling tube 1 is fixedly connected with a first flow velocity sensor 6 at one end close to the first detection tube 3, and the secondary sampling tube 2 is fixedly connected with a second flow velocity sensor 10 at one side close to the second detection tube 7;

[0036] The positioning device also includes a controller, which is equipped with a control system. The control system includes a control module. The input end of the control module is respectively connected to a smoke monitoring module and a flow rate monitoring module. The input end of the smoke monitoring module is respectively connected to a first smoke sensor 4 and a second smoke sensor 8. The input end of the flow rate monitoring module is respectively connected to a first flow rate sensor 6 and a second flow rate sensor 10. The output end of the control module is respectively connected to a flow rate regulation module, a timing module, and a positioning calculation module. The output end of the flow rate regulation module is respectively connected to a first fan 5 and a second fan 9.

[0037] Specifically, the method for locating the smoke sampling hole includes the following steps:

[0038] Step 1, start the first fan 5 and the second fan 9, so that the two air flows in the main sampling tube 1 and the auxiliary sampling tube 2 flow at a constant flow rate, wherein the air flow rate in the main sampling tube 1 is V1, the air flow rate in the auxiliary sampling tube is V2, and V1>V2 is set;

[0039] Specifically, the airflow velocity in the main sampling tube 1 and the auxiliary sampling tube 2 is monitored in real time by the first flow velocity sensor 6 and the second flow velocity sensor 10, and the smoke is moved at a constant flow velocity in the main sampling tube 1 and the auxiliary sampling tube 2 in cooperation with the first fan 5 and the second fan 9, thereby improving the accuracy of detection and reducing the influence of external airflow and smoke heat on the airflow velocity in the sampling tube;

[0040] Step 2: When a fire occurs and smoke is generated, the smoke enters the main sampling tube 1 and the auxiliary sampling tube 2 from the main sampling hole 101 and the auxiliary sampling hole 201 closest to the fire point respectively. When the first smoke sensor 4 detects smoke, the timing module records the triggering time T1 of the first smoke sensor 4. When the second smoke sensor 8 detects smoke, the timing module records the triggering time T2 of the second smoke sensor 8.

[0041] Step 3: The positioning calculation module calculates the position of the smoke sampling hole, including the following sub-steps:

[0042] S1, define the distance between the smoke sampling hole and the detection tube as L, the time when the smoke enters the sampling hole as T0, and obtain the equation for the smoke moving distance in the main sampling tube 1 as L = (T1-T0)*V1 and the equation for the smoke moving distance in the auxiliary sampling tube 2 as L = (T2-T0)*V2;

[0043] S2, combine the two equations in S1 to obtain L = (T2-T1)*V1*V2 / (V1-V2), substitute the values ​​of T1, T2, V1, and V2 in steps 1 and 2 to obtain the value of L.

[0044] Specifically, the position of the smoke sampling hole is obtained through the L value.

[0045] Compared with the existing smoke hole positioning system, the present invention monitors the air flow velocity in the main sampling tube 1 and the auxiliary sampling tube 2 in real time through the flow velocity sensor arranged at the end of the sampling tube, and cooperates with the first fan 5 and the second fan 9 to make the smoke flow at a constant flow rate in the sampling tube, thereby improving the accuracy of detection. At the same time, the smoke movement distance is calculated by combining the smoke movement distance equation in the main sampling tube and the auxiliary sampling tube, replacing the traditional sampling hole smoke release test calibration method, reducing the amount of engineering and having better adaptability.

[0046] Second implementation method:

[0047] Figure 4-10 A suction sampling tube smoke inhalation hole positioning system is shown. Based on the first embodiment, the positioning system also includes a calibration mechanism, which includes a connecting tube 11 fixedly sleeved on the right ends of the main sampling tube 1 and the auxiliary sampling tube 2. A pair of end covers 13 for blocking the right end openings of the main sampling tube 1 and the auxiliary sampling tube 2 are provided in the connecting tube 11. The pair of end covers 13 are fixedly connected to each other and the right ends of the two are fixedly connected to the same electric telescopic rod 14, and the electric telescopic rod 14 is fixedly connected to the inner wall of the connecting tube 11; the connecting tube 11 is connected to the dust collecting tube 12, and the outer wall of the dust collecting tube 12 is fixedly connected to a filter screen;

[0048] The calibration mechanism also includes a pair of cleaning components 16 respectively arranged in the main sampling tube 1 and the auxiliary sampling tube 2. The cleaning component 16 includes a fixed ring 17 arranged on the right side of the main sampling hole 101. The fixed ring 17 is fixedly connected to a sliding rod 18. The sliding rod 18 is slidably connected to a blocking ring 19 arranged on the left side of the main sampling hole 101. The blocking ring 19 is used to block the sampling hole. A central column 20 is provided at the center of the blocking ring 19. The central column 20 is fixedly connected to the inner wall of the blocking ring 19 through supporting columns 21 distributed in a circumference. The center column 20 is fixed with a traction rope 15 distributed along the central axis of the main sampling tube 1. The right end of the traction rope 15 is fixedly connected to the end cover 13, and the left end of the traction rope 15 is fixedly connected to the limit plate 26. A limit rod 27 fixedly connected to the inner wall of the main sampling tube 1 is provided on the right side of the limit plate 26. The traction rope 15 passes through the limit rod 27 and is slidably connected to the limit rod 27. A spring 28 sleeved on the traction rope 15 is provided between the limit plate 26 and the limit rod 27; both the first fan 5 and the second fan 9 are bidirectional fans.

[0049] Specifically, when calibrating the positioning system, the following steps are included:

[0050] Step 1: Start the electric telescopic rod 14, which drives a pair of end caps 13 to disengage from the right end openings of the main sampling tube 1 and the auxiliary sampling tube 2, so that the main sampling tube 1 and the auxiliary sampling tube 2 are connected to the connecting tube 11. At the same time, the end cap 13 drives the blocking ring 19 to move to the right through the traction rope 15 until the blocking ring 19 abuts against the fixing ring 17. At this time, the sampling hole is covered and closed by the blocking ring 19.

[0051] Specifically, the main sampling hole 101 and the auxiliary sampling hole 201 are both closed by the blocking ring 19;

[0052] Step 2: Start the first fan 5 and the second fan 9 and make them blow air into the main sampling tube 1 and the auxiliary sampling tube 2 respectively.

[0053] Specifically, by blocking the sampling holes and blowing air into the main sampling tube 1 and the auxiliary sampling tube 2, the main sampling tube 1 and the auxiliary sampling tube 2 are sprayed and cleaned by the airflow. On the one hand, the dust in the main sampling tube 1 and the auxiliary sampling tube 2 is reduced, the blockage is reduced, and the detection accuracy is improved. At the same time, a large amount of dust in the sampling tube is prevented from entering the room during cleaning; on the other hand, the smoke and dust deposited in the used sampling tube is sprayed, so that the sampling tube can be reused many times, reducing the cost of use.

[0054] See also Figure 7-10A dredging assembly is provided on the sealing ring 19, and the dredging assembly includes a dredging rod 24 arranged opposite to the sampling hole. The dredging rod 24 is radially slidably connected to the sealing ring 19. A rotating cylinder 22 rotatably connected to the upper end of the dredging rod 24 is sleeved, and the rotating cylinder 22 is rotatably connected to the supporting column 21. A sliding column 25 is fixedly connected to the upper end of the dredging rod 24. An elliptical guide groove 2201 is provided on the inner wall of the rotating cylinder 22, and blades 23 distributed in a circle are fixedly connected to the outer wall of the rotating cylinder 22.

[0055] Specifically, when the first fan 5 and the second fan 9 are calibrated for spraying, the airflow pushes the rotating cylinder 22 equipped with the blades 23 to rotate, and the rotating cylinder 22 squeezes the sliding column 25 of the clearing rod 24 through the guide groove 2201, so that the clearing rod 24 moves radially back and forth. The clearing rod 24 is inserted into the sampling hole to squeeze and clear the sampling hole, thereby achieving the cleaning of the main sampling hole 101 and the auxiliary sampling hole 201, avoiding the clogging of the sampling hole and reducing the accuracy of the positioning of the smoke sampling hole.

[0056] See also Fig. 9 and 10 The dredging rod 24 includes a cylindrical rod 2401, a square rod 2402 is fixedly connected to the lower end of the cylindrical rod 2401, a conical block 2403 is fixedly connected to the lower end of the square rod 2402, the rotating cylinder 22 is provided with a columnar cavity for the cylindrical rod 2401 to slide, the inner wall of the blocking ring 19 is provided with a square hole 1901 for the square rod 2402 to be inserted, and the outer wall of the blocking ring 19 is provided with a columnar hole 1902 connected to the square hole 1901.

[0057] Specifically, the cooperation between the square hole 1901 and the square rod 2402 enables the dredging rod 24 to reciprocate radially when being squeezed.

[0058] See also Figure 5 and Figure 8 Both the fixing ring 17 and the sealing ring 19 are annular structures, and the sealing ring 19 is provided with a conical surface on the side away from the fixing ring 17.

[0059] Specifically, by providing a conical surface on one side of the blocking ring 19, dust and smoke can be moved more easily in the sampling tube, thereby improving the cleaning effect.

[0060] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A smoke inhalation hole positioning system for an air sampling tube, characterized in that: The positioning system comprises a positioning device; the positioning device comprises a main sampling tube (1) and a secondary sampling tube (2) arranged in parallel; the left side of the main sampling tube (1) is connected in sequence with a first detection tube (3) and a first fan (5); the main sampling tube (1) is provided with main sampling holes (101) distributed at equal intervals; the left side of the secondary sampling tube (2) is fixedly connected in sequence with a second detection tube (7) and a second fan (9); the secondary sampling tube (2) is provided with a secondary sampling hole (201) arranged opposite to the main sampling hole (101); the first detection tube (3) is fixedly connected with a first smoke sensor (4); the second detection tube (7) is fixedly connected with a second smoke sensor (8); the end of the main sampling tube (1) close to the first detection tube (3) is fixedly connected with a first flow velocity sensor (6); the side of the secondary sampling tube (2) close to the second detection tube (7) is fixedly connected with a second flow velocity sensor (10); The positioning device also includes a controller, the controller is equipped with a control system, the control system includes a control module, the input end of the control module is respectively connected to the smoke monitoring module and the flow rate monitoring module, the input end of the smoke monitoring module is respectively connected to the first smoke sensor (4) and the second smoke sensor (8), and the input end of the flow rate monitoring module is respectively connected to the first flow rate sensor (6) and the second flow rate sensor (10); the output end of the control module is respectively connected to the flow rate regulation module, the timing module, and the positioning calculation module, and the output end of the flow rate regulation module is respectively connected to the first fan (5) and the second fan (9).

2. The smoke inhalation hole positioning system of the air suction sampling tube according to claim 1 is characterized in that: The positioning system further comprises a calibration mechanism, the calibration mechanism comprising a connecting tube (11) fixedly sleeved on the right ends of the main sampling tube (1) and the auxiliary sampling tube (2), a pair of end covers (13) for sealing the right end openings of the main sampling tube (1) and the auxiliary sampling tube (2) being arranged in the connecting tube (11), the pair of end covers (13) being fixedly connected to each other and the right ends of the two end covers are fixedly connected to the same electric telescopic rod (14), the electric telescopic rod (14) being fixedly connected to the inner wall of the connecting tube (11); the connecting tube (11) is connected to a dust collecting tube (12), the outer wall of the dust collecting tube (12) being fixedly connected to a filter screen; the first fan (5) and the second fan (9) are both bidirectional fans.

3. The smoke suction hole positioning system of the air suction sampling tube according to claim 2 is characterized in that: The calibration mechanism further comprises a pair of cleaning components (16) respectively arranged in the main sampling tube (1) and the auxiliary sampling tube (2), the cleaning component (16) comprising a fixing ring (17) arranged on the right side of the main sampling hole (101), the fixing ring (17) being fixedly connected to a sliding rod (18), the sliding rod (18) being slidably connected to a blocking ring (19) arranged on the left side of the main sampling hole (101), the blocking ring (19) being used to block the sampling hole, a central column (20) being arranged at the center of the blocking ring (19), the central column (20) being connected to the blocking ring (19) by supporting columns (21) distributed in a circumference. The inner wall of the ring (19) is fixedly connected, a traction rope (15) distributed along the central axis of the main sampling tube (1) is fixedly connected to the central column (20), the right end of the traction rope (15) is fixedly connected to the end cover (13), the left end of the traction rope (15) is fixedly connected to a limit plate (26), a limit rod (27) fixedly connected to the inner wall of the main sampling tube (1) is provided on the right side of the limit plate (26), the traction rope (15) passes through the limit rod (27) and is slidably connected to the limit rod (27), and a spring (28) sleeved on the traction rope (15) is provided between the limit plate (26) and the limit rod (27).

4. The smoke suction hole positioning system of the air suction sampling tube according to claim 3 is characterized in that: The sealing ring (19) is provided with a dredging assembly, which comprises a dredging rod (24) arranged opposite to the sampling hole, the dredging rod (24) is radially slidably connected to the sealing ring (19), the upper end of the dredging rod (24) is sleeved with a rotating cylinder (22) rotatably connected thereto, the rotating cylinder (22) is rotatably connected to the support column (21), the upper end of the dredging rod (24) is fixedly connected to a sliding column (25), the inner wall of the rotating cylinder (22) is provided with an elliptical guide groove (2201), and the outer wall of the rotating cylinder (22) is fixedly connected to blades (23) distributed in a circumference.

5. The smoke suction hole positioning system of the air suction sampling tube according to claim 4 is characterized in that: The dredging rod (24) comprises a cylindrical rod (2401), the lower end of the cylindrical rod (2401) is fixedly connected to a square rod (2402), the lower end of the square rod (2402) is fixedly connected to a conical block (2403), the rotating cylinder (22) is provided with a columnar cavity for the cylindrical rod (2401) to slide, the inner wall of the blocking ring (19) is provided with a square hole (1901) for the square rod (2402) to be inserted, and the outer wall of the blocking ring (19) is provided with a columnar hole (1902) connected to the square hole (1901).

6. The smoke inhalation hole positioning system of the air suction sampling tube according to claim 4 is characterized in that: The fixing ring (17) and the sealing ring (19) are both annular structures, and the sealing ring (19) is provided with a conical surface on the side away from the fixing ring (17).

7. A method for positioning a smoke suction hole of an air suction sampling tube, using the smoke suction hole positioning system of an air suction sampling tube as claimed in claim 1, characterized in that: The positioning process includes the following steps: Step 1, starting the first fan (5) and the second fan (9), so that the two air flows in the main sampling pipe (1) and the auxiliary sampling pipe (2) flow at a constant flow rate, wherein the air flow rate in the main sampling pipe (1) is V1, the air flow rate in the auxiliary sampling pipe (2) is V2, and V1>V2 is set; Step 2: When a fire occurs and smoke is generated, the smoke enters the main sampling tube (1) and the auxiliary sampling tube (2) respectively from the main sampling hole (101) and the auxiliary sampling hole (201) closest to the fire point; when the first smoke sensor (4) detects smoke, the timing module records the triggering time T1 of the first smoke sensor (4); when the second smoke sensor (8) detects smoke, the timing module records the triggering time T2 of the second smoke sensor (8); Step 3: The positioning calculation module calculates the position of the smoke sampling hole, including the following sub-steps: S1, define the distance between the smoke sampling hole and the detection tube as L, the time when the smoke enters the sampling hole as T0, and obtain the equation for the smoke moving distance in the main sampling tube (1) as L=(T1-T0)*V1 and the equation for the smoke moving distance in the auxiliary sampling tube (2) as L=(T2-T0)*V2; S2, combine the two equations in S1 to obtain L = (T2-T1)*V1*V2 / (V1-V2), substitute the values ​​of T1, T2, V1, and V2 in steps 1 and 2 to obtain the value of L.

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