Portable stationary pollution source on-line monitoring flow instrument calibration device

Abstract

The utility model relates to the technical field of flow instrument calibration, in particular to a portable stationary pollution source online monitoring flow instrument calibration device which comprises a main pipeline, an air inlet pipe is fixed to the bottom of the main pipeline, an upper calibration pipe is fixed to the right end of the main pipeline, and a lower calibration pipe is fixed to the left end of the main pipeline. Positioning pipes are fixed to the exteriors of the upper calibration pipe and the lower calibration pipe through sealing flanges, an ultrasonic probe is detachably connected to the interior of each positioning pipe, an exhaust pipe is fixed to the top of the main pipeline, a fan is fixed to the interior of the exhaust pipe, a rectifying plate is arranged at the bottom of the fan and is fixedly connected with the exhaust pipe, and the upper calibration pipe and the lower calibration pipe are arranged in the main pipeline. A cleaning disc is arranged at the top of the fan, and a filter plate is arranged at the top of the cleaning disc; the sealing plate motor drives the sealing plate to rotate so that the ultrasonic probe can be conveniently installed, and meanwhile the sealing plate can guarantee the sealing performance of the positioning pipe, so that the monitoring accuracy of the ultrasonic probe is guaranteed, and the calibration effect is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of flow meter calibration technology, specifically a portable online monitoring flow meter calibration device for fixed pollution sources. Background Technology

[0002] Newly manufactured ultrasonic gas flow meters need to be calibrated before leaving the factory to ensure their measurement accuracy. Due to factors such as manufacturing processes and component quality, the measured values ​​of new flow meters may have some deviation. By using a calibration device, a standard gas of known flow rate is passed through the flow meter to be calibrated. Comparing the flow meter's measured value with the standard value allows for accurate determination of the measurement error, enabling adjustments and corrections to ensure accurate flow data after it is put into use.

[0003] During long-term use, the performance of gas flow meters may change due to various factors, such as wear and corrosion within the pipeline, and fluctuations in ambient temperature and pressure. These factors can lead to a gradual increase in measurement error. Regularly calibrating the flow meter using a calibration device can promptly detect and correct these changes, ensuring that the flow meter maintains good measurement accuracy and enabling stable operation in industrial production processes such as material proportioning and energy metering.

[0004] Unified Measurement Standards: To ensure the comparability and consistency of measurement results in different laboratories, factories, or regions, gas flow meters need to be calibrated uniformly. Calibration devices provide a standardized measurement environment and known flow standards, enabling different flow meters to be calibrated according to the same standard. This achieves the unification and mutual recognition of measurement results, which is of great significance for data sharing in cross-regional industrial production, trade settlement, and scientific research.

[0005] Research and Testing: In the research and development of gas flow meters, calibration devices are used to test and evaluate the performance of newly designed flow meters, helping researchers optimize design schemes and improve the measurement accuracy and reliability of the flow meters. Researchers also need to use calibration devices to calibrate the flow meters they use when conducting experiments involving gas flow measurement to ensure the accuracy and scientific validity of experimental data, providing reliable support for research work.

[0006] However, most existing calibration devices can only calibrate one type of flow meter, which limits the scope of application of the entire device. In addition, the calibration effect of existing calibration devices is poor due to dust. To address these issues, this invention designs a portable online monitoring flow meter calibration device for fixed pollution sources. Utility Model Content

[0007] In view of the above situation and to overcome the defects of the prior art, this utility model provides a portable online monitoring flow meter calibration device for fixed pollution sources, which effectively solves the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a portable fixed pollution source online monitoring flow meter calibration device, comprising a main pipeline, an air inlet pipe fixed to the top of the main pipeline, an upper calibration pipe fixed to the upper end of the main pipeline, a lower calibration pipe fixed to the lower end of the main pipeline, positioning pipes fixed to the outside of the upper and lower calibration pipes via sealing flanges, a sealing plate slidably connected to the outside of each positioning pipe, an ultrasonic probe detachably connected inside each positioning pipe, an exhaust pipe fixed to the top of the air inlet pipe, a fan fixed inside the exhaust pipe, a rectifier plate fixed to the bottom of the main pipeline, a proximity rod provided to the top of the fan, a cleaning disc fixed to the top of the proximity rod via a connecting rod, a filter plate provided to the top of the cleaning disc, a cleaning pipe provided to the top of the filter plate, a cleaning strip fixed to the outside of the cleaning pipe, a support plate fixed to the front end of the exhaust pipe, a controller fixed to the top of the support plate, and a power supply fixed to the right end of the controller.

[0009] Preferably, the measuring point inside the intake pipe is equidistant from the end of the lower calibration tube and the end of the upper calibration tube, the measuring point is four times the inner diameter of the main pipe, the measuring point is twice the inner diameter of the intake pipe, the lower calibration tube is at a 30° angle to the axis of the intake pipe, and the upper calibration tube is at a 150° angle to the axis of the intake pipe.

[0010] Preferably, the exhaust pipe is fixedly connected to the proximity rod via a fixing rod, a cleaning motor is fixedly fixed to the top of the proximity rod, a cleaning shaft is rotatably connected to the top of the cleaning motor, the cleaning shaft is slidably connected to the cleaning disc, a cleaning block is fixed to the top of the cleaning shaft, the outer diameter of the cleaning block is slightly smaller than the inner diameter of the cleaning pipe, and two cleaning buckles are fixed inside the cleaning pipe.

[0011] Preferably, a bearing is fixed to the top of the cleaning pipe, a connecting plate is fixed to the outer ring of the bearing, the connecting plate is fixedly connected to the exhaust pipe, and a plurality of cleaning heads are fixed to the top of the cleaning disc, each cleaning head having the same axis as the through hole on the filter plate on its top.

[0012] Preferably, each clamping rod is fixedly connected to the sealing flange on its inner side via a fixing plate, a clamping plate is fixed to the inner side of each clamping rod, each clamping plate is tightly fitted to the ultrasonic probe on its inner side, a wire is fixed to the outside of each ultrasonic probe, a sealing strip is fixed to the outside of each positioning tube, each sealing strip can be tightly fitted to the wire at one end, and a sealing plate motor is also fixed to the outside of each exhaust pipe, each sealing plate motor is rotatably connected to the sealing plate at one end via a rotating shaft.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This invention facilitates the installation of ultrasonic probes by rotating a sealing plate driven by a motor. The sealing plate also ensures the sealing of the positioning tube, thereby guaranteeing the accuracy of ultrasonic probe monitoring and calibration. The device's clamping rod extends and retracts, moving the clamping plate to clamp the ultrasonic probe, ensuring its stability and adaptability to different probe sizes, thus expanding the device's applicability. Furthermore, the sealing strip further ensures the sealing of the positioning tube, further guaranteeing calibration accuracy.

[0015] This invention changes the speed of the fan at the bottom of the blower by altering the current and voltage of the blower, thereby changing the blower's speed setting. Since the blower of this device has multiple adjustable speed settings, several flow rate points can be determined according to the required speed settings to calibrate the ultrasonic flow meter, thereby improving the calibration range, ensuring calibration efficiency, and guaranteeing calibration accuracy.

[0016] The proximity rod of this invention is telescopic, which allows the cleaning disc to move, ensuring that the cleaning disc is in close contact with the filter plate and thus guaranteeing the cleaning effect of the filter plate. Furthermore, a cleaning block is inserted into the cleaning tube, and a cleaning motor drives the cleaning shaft to rotate, which in turn rotates the cleaning block, the cleaning tube, and the cleaning strip, thereby cleaning impurities from the filter plate. Simultaneously, the filter plate of this device filters dust and impurities from the air, ensuring the cleanliness of the fan at the bottom of the blower, thus guaranteeing the accuracy and effectiveness of the calibration. Attached Figure Description

[0017] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0018] In the attached diagram:

[0019] Figure 1 This is a schematic diagram of the overall front view of this utility model;

[0020] Figure 2 This is a schematic cross-sectional view of the present invention;

[0021] Figure 3 This is a schematic diagram of the top of the superscript tube of this utility model;

[0022] Figure 4 This is a schematic diagram of the external shape of the positioning tube of this utility model;

[0023] Figure 5 This is a schematic diagram of the inside of the positioning tube of this utility model;

[0024] Figure 6 This is a schematic diagram of the upper end of the exhaust pipe of this utility model;

[0025] Figure 7 This is a cross-sectional view of the exhaust pipe of this utility model;

[0026] Figure 8 This is a schematic diagram of the upper end of the rod of this utility model;

[0027] Figure 9 This is a schematic diagram of the upper part of the cleaning disc of this utility model;

[0028] Figure 10 This is a schematic diagram of the bottom of the cleaning tube of this utility model;

[0029] Figure 11 This is a schematic diagram of the outer end of the rectifier plate of this utility model.

[0030] In the diagram: 1-Intake pipe; 2-Upper marking pipe; 3-Exhaust pipe; 4-Positioning pipe; 5-Fan; 6-Filter plate; 7-Proximity rod; 101-Main pipe; 102-Measuring point; 201-Lower marking pipe; 202-Sealing flange; 301-Support plate; 302-Controller; 303-Power supply; 401-Sealing plate; 402-Clamping rod; 403-Sealing plate motor; 404-Sealing strip; 405-Wire; 406-Ultrasonic probe; 407-Clamping plate; 501-Rectifier plate; 601-Bearing; 602-Connecting plate; 603-Cleaning pipe; 604-Cleaning strip; 605-Cleaning disc; 606-Cleaning head; 607-Cleaning buckle; 701-Connecting rod; 702-Cleaning motor; 703-Cleaning shaft; 704-Cleaning block. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0032] Example 1, by Figures 1-3 , Figures 6-7 , Figure 9The present invention includes an air inlet pipe 1, which is made of alloy material and is used to output gas. A main pipe 101, also made of alloy material, is fixed to the top of the air inlet pipe 1. The main pipe 101 supplies the required standard gas to the upper calibration pipe 2 and the lower calibration pipe 201. The air inlet pipe 1 and the main pipe 101 cooperate to fix the upper calibration pipe 2 and the lower calibration pipe 201. The upper calibration pipe 2, made of alloy material, is fixed to the upper end of the air inlet pipe 1, and the lower calibration pipe 201, also made of alloy material, is fixed to the lower end of the air inlet pipe 1. The upper calibration pipe 2 and the lower calibration pipe 201 cooperate to calibrate ultrasonic waves. The gas flow meter has a positioning tube 4 fixed to the outside of the upper calibration tube 2 and the lower calibration tube 201 via a sealing flange 202. The positioning tube 4 is made of alloy material and is used to position the ultrasonic probe 406. A sealing plate 401, also made of alloy material, is slidably connected to the outside of each positioning tube 4 to ensure the sealing of the positioning tube 4, thereby ensuring the accuracy of the ultrasonic probe 406 and the calibration effect. An ultrasonic probe 406 is detachably connected inside each positioning tube 4. The two ultrasonic probes 406 work together to monitor the gas flow inside the main pipe 101. An exhaust pipe 3 is fixed to the top of the main pipe 101. The exhaust pipe 3 is made of alloy material and is used to transport gas. A fan 5 is fixed inside the exhaust pipe 3. The fan 5 has multiple adjustable speeds, allowing for the determination of several flow rate points to calibrate the ultrasonic flow meter. A rectifier plate 501 is fixed at the bottom of the inlet pipe 1 to ensure stable airflow. A proximity rod 7 is provided at the top of the fan 5. The proximity rod 7 is retractable, thereby moving the cleaning disc 605 to ensure it is in close contact with the filter plate 6, thus guaranteeing the cleaning effect of the filter plate 6. The cleaning disc 605, made of alloy material, is fixed to the top of the proximity rod 7 via a connecting rod 701. The cleaning disc 605 is used for positioning... The cleaning head 606 and the cleaning disc 605 are equipped with a filter plate 6 at the top. The filter plate 6 has several through holes and is used to filter dust and impurities in the air, thereby ensuring the cleanliness of the fan at the bottom of the blower 5, thus ensuring the accuracy and effectiveness of the calibration. The top of the filter plate 6 is equipped with a cleaning tube 603, which is made of alloy material. A cleaning strip 604 is fixed to the outside of the cleaning tube 603. The lower end of the cleaning strip 604 is made of rubber material. The cleaning tube 603 can rotate to drive the cleaning strip 604 to rotate, thereby cleaning impurities on the surface of the filter plate 6. The exhaust pipe 3 is fixed to the front end with a support plate 301, which is made of alloy material.The support plate 301 is used to position the controller 302. The controller 302 is fixed to the top of the support plate 301. The controller 302 is used to control the entire device. A power supply 303 is fixed to the right end of the controller 302, and the power supply 303 provides the necessary energy to the entire device.

[0033] Example 2, based on Example 1, combined with... Figure 4 , Figure 5 , Figure 8 , Figure 10As specified, the measuring point 102 inside the main pipe 101 is equidistant from the ends of the lower calibration pipe 201 and the upper calibration pipe 2. The distance between the measuring point 102 and the rectifier plate 501 is four times the inner diameter of the intake pipe 1. The distance between the measuring point 102 and the bottom of the intake pipe 101 is twice the inner diameter of the intake pipe 101. The angle between the lower calibration pipe 201 and the axis of the main pipe 101 is 30°, and the angle between the upper calibration pipe 2 and the axis of the main pipe 101 is 150°. The exhaust pipe 3 is fixedly connected to the proximity rod 7 via a fixing rod. A cleaning motor 702 is fixed to the top of the proximity rod 7. The cleaning motor 702 can drive the cleaning shaft 703 to rotate. A cleaning shaft 703 is rotatably connected to the top. The cleaning shaft 703, by rotating, can drive the cleaning block 704 to rotate. The cleaning shaft 703 is slidably connected to the cleaning disc 605. A cleaning block 704 is fixed to the top of the cleaning shaft 703. The cleaning block 704, by rotating, can drive the cleaning tube 603 to rotate. The outer diameter of the cleaning block 704 is slightly smaller than the inner diameter of the cleaning tube 603. Two cleaning buckles 607, made of alloy material, are fixed inside the cleaning tube 603. The cleaning buckles 607 are used to lock the cleaning block 704. A bearing 601 is fixed to the top of the cleaning tube 603. The bearing 601 is used to position the cleaning tube 603. A connecting plate is fixed to the outer ring of the bearing 601. 602, the connecting plate 602 is made of alloy material, the connecting plate 602 is used to position the bearing 601, the connecting plate 602 is fixedly connected to the exhaust pipe 3, the cleaning disc 605 has several cleaning heads 606 fixed on its top, the cleaning heads 606 are made of alloy material, the cleaning heads 606 can block the through holes on the filter plate 6, thereby preventing impurities on the outer surface of the filter plate 6 from entering the exhaust pipe 3 during cleaning, each cleaning head 606 has the same axis as the through hole on the filter plate 6 on its top, each clamping rod 402 is fixedly connected to the sealing flange 202 on its inner side through a fixing plate, each clamping rod 402 has a clamping plate 407 fixed on its inner side, the clamping plate 407... 7. Made of rubber material, the clamping plate 407 is used to clamp the ultrasonic probe 406. Each clamping plate 407 is tightly fitted to the ultrasonic probe 406 on its inner side. A wire 405 is fixed to the outside of each ultrasonic probe 406. A sealing strip 404, made of rubber material, is fixed to the outside of each positioning tube 4. The sealing strip 404 is used to seal the wire 405, thereby ensuring the sealing performance of the positioning tube 4. Each sealing strip 404 can be tightly fitted to one end of the wire 405. A sealing plate motor 403 is also fixed to the outside of each exhaust pipe 3. The sealing plate motor 403 can drive the sealing plate 401 to rotate, thereby facilitating the installation of the ultrasonic probe 406.Each of the sealing plate motors 403 and the sealing plate 401 at one end are rotatably connected via a shaft;

[0034] Before using this device, the operator opens the sealing flange 202. The controller 302 then controls the sealing plate motor 403 to operate, causing the sealing plate 401 to rotate, thus opening the positioning tube 4. The operator then places the two ultrasonic probes 406 into the two positioning tubes 4 in sequence. The controller 302 then controls the extension of the two sets of clamping rods 402, causing the two sets of clamping plates 407 to move, thereby clamping the ultrasonic probes 406 and ensuring their stability. At this point, the controller 302 controls the sealing plate motor 403 to operate. 3. Reverse operation, thereby ensuring that the positioning tube 4 is tightly attached to the sealing plate 401, thus guaranteeing the seal of the positioning tube 4. At this time, the sealing strip 404 further ensures the sealing degree between the wire 405 and the positioning tube 4, thereby ensuring the accuracy of calibration. Furthermore, the controller 302 controls the fan 5 to work, so that the airflow enters the main pipe 101 from the filter plate 6 and reaches the measuring point 102 along the main pipe 101. Upon reaching the measuring point 102, the airflow fluctuation causes airflow fluctuation inside the upper calibration tube 2 and the lower calibration tube 201. This allows the two ultrasonic probes 406 to detect airflow fluctuations, thereby monitoring the flow velocity and flow rate at the measurement point 102. Since the airflow blown by the fan 5 is a standard airflow, it is compared with the ultrasonic flow meter outside the ultrasonic probes 406 to observe the accuracy of the ultrasonic flow meter, thus achieving calibration. The controller 302 can adjust the fan 5 speed to calibrate different flow rates, providing a comparison and ensuring calibration accuracy. Furthermore, when the operator finds impurities on the filter plate 6, the controller 302 controls the... The protruding rod 7 extends, thereby moving the cleaning disc 605 upward, allowing the cleaning head 606 to insert into the through hole on the filter plate 6. At this time, the controller 302 controls the cleaning motor 702 to work, thereby driving the cleaning shaft 703 to rotate, which in turn drives the cleaning block 704 to rotate, and thus drives the cleaning tube 603 to rotate. The cleaning buckle 607 ensures the rotation effect of the cleaning tube 603. The cleaning tube 603 also drives the cleaning strip 604 to rotate, thereby achieving the purpose of cleaning the surface of the filter plate 6, and further ensuring the calibration accuracy.

[0035] The working process of this utility model is as follows: Before using this device, the operator opens the sealing flange 202. Then, the controller 302 controls the sealing plate motor 403 to operate, thereby driving the sealing plate 401 to rotate, thus opening the positioning tube 4. At this time, the operator places the two ultrasonic probes 406 into the two positioning tubes 4 in sequence. Then, the controller 302 controls the extension of the two sets of clamping rods 402, thereby driving the movement of the two sets of clamping plates 407, thus clamping the ultrasonic probes 406 and ensuring the stability of the two ultrasonic probes 406. At this time, the controller 302 controls the... The sealing plate motor 403 operates in reverse, causing the positioning tube 4 to be tightly pressed against the sealing plate 401, thus ensuring the sealing of the positioning tube 4. At this time, the sealing strip 404 further ensures the sealing degree between the wire 405 and the positioning tube 4, thereby ensuring the accuracy of the calibration. Furthermore, the controller 302 controls the fan 5 and the rectifier plate 501 to work, so that the airflow enters the main pipe 101 from the filter plate 6 and reaches the measuring point 102 along the main pipe 101. Upon reaching the measuring point 102, the airflow fluctuation causes the upper calibration tube 2 and the lower calibration tube 2 to... The airflow fluctuations inside the 01 are detected by the two ultrasonic probes 406, thereby monitoring the flow velocity and flow rate at the measurement point 102. Since the airflow blown by the fan 5 is a standard airflow, it is compared with the ultrasonic flow meter outside the ultrasonic probe 406 to observe the accuracy of the ultrasonic flow meter, thus achieving calibration. The controller 302 can calibrate different flow rates by changing the speed of the fan 5, thus ensuring calibration accuracy. Furthermore, when the operator finds impurities on the filter plate 6, the controller 302... 2. Control the extension of the proximity rod 7, thereby driving the cleaning disc 605 to move upward, so that the cleaning head 606 is inserted into the through hole on the filter plate 6. At this time, the controller 302 controls the cleaning motor 702 to work, thereby driving the cleaning shaft 703 to rotate, thereby driving the cleaning block 704 to rotate, thereby driving the cleaning tube 603 to rotate. At this time, the cleaning buckle 607 can ensure the rotation effect of the cleaning tube 603. At this time, the cleaning tube 603 can drive the cleaning strip 604 to rotate, thereby achieving the purpose of cleaning the surface of the filter plate 6, thereby further ensuring the calibration accuracy.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A portable online monitoring flow meter calibration device for stationary pollution sources, characterized in that: The system includes an intake pipe (1), a main pipe (101) fixed to the top of the intake pipe (1), a top marking pipe (2) fixed to the upper end of the intake pipe (1), a bottom marking pipe (201) fixed to the lower end of the intake pipe (1), positioning pipes (4) fixed to the outside of the top marking pipe (2) and the bottom marking pipe (201) via sealing flanges (202), a sealing plate (401) slidably connected to the outside of each positioning pipe (4), and an ultrasonic probe (406) detachably connected inside each positioning pipe (4). An exhaust pipe (3) is fixed to the top of the main pipe (101), and a fan is fixed inside the exhaust pipe (3). (5) A rectifier plate (501) is fixed at the bottom of the air intake pipe (1). A proximity rod (7) is provided at the top of the fan (5). A cleaning plate (605) is fixed at the top of the proximity rod (7) via a connecting rod (701). A filter plate (6) is provided at the top of the cleaning plate (605). A cleaning pipe (603) is provided at the top of the filter plate (6). A cleaning strip (604) is fixed to the outside of the cleaning pipe (603). A support plate (301) is fixed at the front end of the exhaust pipe (3). A controller (302) is fixed at the top of the support plate (301). A power supply (303) is fixed at the right end of the controller (302).

2. The portable online monitoring flow meter calibration device for stationary pollution sources according to claim 1, characterized in that: The measuring point (102) inside the main pipe (101) is at the same distance from the end of the lower calibration pipe (201) and the end of the upper calibration pipe (2). The distance between the measuring point (102) and the rectifier plate (501) is four times the inner diameter of the air inlet pipe (1). The distance between the measuring point (102) and the bottom of the main pipe (101) is twice the inner diameter of the main pipe (101). The angle between the lower calibration pipe (201) and the axis of the main pipe (101) is 30°. The angle between the upper calibration pipe (2) and the axis of the main pipe (101) is 150°.

3. The portable online monitoring flow meter calibration device for stationary pollution sources according to claim 2, characterized in that: The exhaust pipe (3) is fixedly connected to the proximity rod (7) by a fixing rod. A cleaning motor (702) is fixed at the top of the proximity rod (7). A cleaning shaft (703) is rotatably connected to the top of the cleaning motor (702). The cleaning shaft (703) is slidably connected to the cleaning disc (605). A cleaning block (704) is fixed at the top of the cleaning shaft (703). The outer diameter of the cleaning block (704) is slightly smaller than the inner diameter of the cleaning pipe (603). Two cleaning buckles (607) are fixed inside the cleaning pipe (603).

4. The portable online monitoring flow meter calibration device for stationary pollution sources according to claim 3, characterized in that: The top of the cleaning pipe (603) is fixed with a bearing (601), and the outer ring of the bearing (601) is fixed with a connecting plate (602). The connecting plate (602) is fixedly connected to the exhaust pipe (3). The top of the cleaning disc (605) is fixed with a plurality of cleaning heads (606), and each cleaning head (606) is aligned with the axis of the through hole on the filter plate (6) on its top.

5. The portable online monitoring flow meter calibration device for stationary pollution sources according to claim 1, characterized in that: Each clamping rod (402) is fixedly connected to the sealing flange (202) on its inner side by a fixing plate. A clamping plate (407) is fixed on the inner side of each clamping rod (402). Each clamping plate (407) is tightly fitted to the ultrasonic probe (406) on its inner side. A wire (405) is fixed on the outside of each ultrasonic probe (406). A sealing strip (404) is fixed on the outside of each positioning tube (4). Each sealing strip (404) can be tightly fitted to the wire (405) at one end. A sealing plate motor (403) is also fixed on the outside of each exhaust pipe (3). Each sealing plate motor (403) is rotatably connected to the sealing plate (401) at one end of its shaft.

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