Ectopic method beta-ray direct-reading smoke dust monitoring device

Abstract

The utility model provides an ectopic method beta ray direct reading smoke dust monitoring device which comprises a sampling tube and a sampling host, the sampling tube and the sampling host are connected through a butt joint port, a mounting plate is arranged in the sampling host, and a paper feeding module, an enrichment detection module and a main control board are arranged on the mounting plate; the enrichment detection module comprises a base, a nozzle support is arranged on the left side of the base, a sampling nozzle is arranged below the nozzle support, a nozzle assembly is installed on the nozzle support, and a nozzle lifting motor for driving the nozzle assembly to ascend and descend is further installed on the base; a detector is installed on the right side of the base, and a radioactive source is installed below the detector. According to the utility model, the dust spot enrichment device and the detection device are integrated through the integrated base, so that accurate assembly is facilitated. The paper feeding mechanism can stably operate for a long time, and the detection accuracy is ensured.

Description

Technical Field

[0001] The utility model belongs to the field of soot detection equipment, and particularly relates to an off-site method β-ray direct-reading soot monitoring device. Background Technique

[0002] With the development of the times and the continuous enhancement of the public's environmental protection awareness, the problem of air pollution, especially the pollution from stationary sources, has become the focus of widespread social concern. Stationary source air pollution mainly involves industrial facilities such as boilers and kilns in factories, enterprises and institutions, as well as chimney emissions generated in the catering service industry and daily life of residents. The particulate matter and soot released in these emission activities pose a threat to the natural environment and human health. In view of this, it is extremely urgent to implement strict detection and monitoring of these harmful emissions, aiming to timely understand and control the pollutant emissions, so as to take effective measures to protect and improve air quality.

[0003] The β-ray direct-reading soot monitoring device occupies an important position in particulate matter concentration monitoring due to its portability and real-time performance. Its structure includes a paper feeding module, a dust spot enrichment module and a detection module. The above modules are all assembled on a mounting plate. The dust spot enrichment module includes a nozzle and a sampling nozzle respectively located on the upper and lower sides of the paper tape. The detection module includes a β-ray radiation source and a β-ray detector respectively located on the upper and lower sides of the paper tape. Such devices have the following deficiencies: The components of the dust spot enrichment module and the detection module are independently installed on the mounting plate, and their concentricity and center distance accuracy are insufficient, which in turn affects the accuracy during paper feeding detection. In addition, the paper feeding mechanism is driven by a reduction motor, and the reduction motor needs to be matched with a small clutch for use, and its structure is complex and the control accuracy is low. Content of the Utility Model

[0004] Aiming at the technical problem of insufficient assembly accuracy of the dust spot enrichment module and the detection module of the existing β-ray direct-reading soot monitoring device, the utility model proposes an off-site method β-ray direct-reading soot monitoring device with stable operation and high detection accuracy.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] An off-site method β-ray direct-reading soot monitoring device includes a sampling tube and a sampling host. The sampling tube and the sampling host are connected through an interface. An installation plate is arranged in the sampling host, and a paper feeding module and an enrichment detection module are arranged on the installation plate;

[0007] The enrichment detection module includes a base. A nozzle support is arranged on the left side of the base. A sampling nozzle is arranged below the nozzle support. A nozzle assembly is installed on the nozzle support. A nozzle lifting motor for driving the nozzle assembly to lift is also installed on the base; A detector installation slot is arranged on the right side of the base. A detector is installed in the detector installation slot, and a radiation source is installed below the detector.

[0008] Preferably, the paper feeding module includes a paper receiving wheel, a paper feeding wheel and two tension wheels for receiving and releasing the paper tape. An encoder is installed on one of the tension wheels. Both the paper receiving wheel and the paper feeding wheel include a wheel shaft, and the wheel shaft is driven to rotate by a paper feeding driving device. A spur gear is installed on the wheel shaft, and a bidirectional gear damper meshing with the spur gear is arranged on the mounting plate.

[0009] Preferably, the nozzle assembly includes a nozzle upper cover and a nozzle body. The nozzle upper cover is fixed on the nozzle support. The upper end of the nozzle upper cover is connected to the docking port through a bent pipe. The upper part of the nozzle body is sleeved on the lower part of the nozzle upper cover, and the nozzle body moves up and down driven by a nozzle lifting motor.

[0010] Preferably, a pressure plate is arranged on the outer wall of the nozzle body, an elastic body is arranged between the pressure plate and the nozzle support, and a cam for pushing the pressure plate is connected to the output shaft of the nozzle lifting motor.

[0011] Preferably, a photoelectric switch is installed on the mounting plate, and a photoelectric detection disk for triggering the photoelectric switch is connected to the output shaft of the motor.

[0012] Preferably, an electric heating grid is installed on the mounting plate at a position between the sampling nozzle and the radiation source.

[0013] Preferably, a refrigeration module is further arranged on the mounting plate. The refrigeration module includes a condensation chamber, a semiconductor refrigeration sheet, a heat sink, a fan and a drain pump. An air inlet nozzle and an air outlet nozzle are arranged on the condensation chamber, and the drain pump is connected to the condensation chamber through a pipeline.

[0014] Preferably, the condensation chamber is coated with a heat insulation layer.

[0015] Preferably, the sampling tube includes an air path sampling tube, a dust path sampling tube, a pitot tube and a temperature sensor.

[0016] Preferably, a heating layer is arranged outside the bent pipe.

[0017] Compared with the prior art, the advantages and positive effects of the present utility model are as follows:

[0018] 1. The flue gas monitoring device of the present utility model integrates the dust spot enrichment device and the detection device through an integrated base, and the installation positions of each component are preset on the base, which is convenient for precise assembly. The whole base is fixed on the mounting plate, reducing the errors that may occur during the processing and assembly of the enrichment detection module, thereby improving the concentricity and the accuracy of the center distance of the dust spot enrichment device and the detection device, effectively avoiding the detection deviation that may occur during the reciprocating paper feeding detection, and significantly improving the accuracy of the flue gas monitoring data.

[0019] 2. An electric heating grid is installed at a position on the base between the sampling nozzle and the radiation source. The electric heating grid can dry the paper tape and the dust spots on the paper tape, avoiding the influence of condensed water on the test results.

[0020] 3. The feeding mechanism is provided with a two-way gear damper. The damping effect of the two-way gear damper is more stable, which can ensure the damping effect and will not reduce the damping effect with the increase of time, thus significantly improving the stability and reliability of paper feeding.

[0021] 4. The flue dust monitoring device of the present utility model is also provided with a refrigeration module. The refrigeration module quickly reduces the temperature of the flue gas collected by the gas path sampling pipe to the ambient temperature, effectively removing the condensed water, ensuring the accuracy of subsequent test data, and timely discharging the condensed water through a water pump to ensure the water removal effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is the overall structural schematic diagram of the flue dust monitoring device of the present utility model;

[0023] Figure 2 is the internal structural schematic diagram of the sampling mainframe of the flue dust monitoring device of the present utility model;

[0024] Figure 3 is the front view of the inside of the sampling mainframe of the flue dust monitoring device of the present utility model;

[0025] Figure 4 is Figure 3 the sectional view in the FF direction in

[0026] Figure 5 is the three-dimensional view of the sampling mainframe of the flue dust monitoring device of the present utility model;

[0027] In the above figures: 1. Sampling tube; 11. Sampling probe; 12. Dust path sampling tube; 13. Gas path sampling tube; 14. Pitot tube; 15. Temperature sensor; 2. Sampling main unit; 21. Housing; 22. Interface; 23. Mounting plate; 24. Paper feeding module; 241. Paper receiving wheel; 242. Paper feeding wheel; 243. Tensioning wheel; 244. Encoder; 245. Axle; 246. Stepper motor; 247. Straight gear; 248. Bidirectional gear damper; 25. Enrichment detection module; 251. Base; 252. Nozzle support; 253. Sampling nozzle; 254. Nozzle assembly; 2541. Nozzle upper cover; 2542. Nozzle body; 2543. Pressure plate; 2544. Cam; 2545. Photoelectric detection disc; 2546. Photoelectric switch; 255. Nozzle lifting motor; 256. Detector fixing frame; 257. Detector; 258. Radiation source; 26. Refrigeration module; 261. Condensation chamber; 262. Semiconductor refrigeration chip; 263. Heat sink; 264. Fan; 265. Air inlet nozzle; 266. Air outlet nozzle; 267. Drain nozzle; 268. Water pump; 27. Elbow tube. Detailed implementation mode

[0028] For a better understanding of the present utility model, specific descriptions will be made below in conjunction with the drawings and embodiments.

[0029] Embodiment: As Figure 1 shown, a beta-ray direct-reading smoke and dust monitoring device using the off-site method includes a sampling tube 1 and a sampling main unit 2. The sampling main unit 2 includes a housing 21, and an interface 22 is connected to the front end of the housing 21. The sampling tube 1 and the sampling main unit 2 are connected through the interface 22. The sampling tube 1 includes a sampling probe 11, and a dust path sampling tube 12, a gas path sampling tube 13 and a Pitot tube 14 extending to the front end are installed inside the sampling probe 11. An external PT100 temperature sensor 15 is also installed at the front end of the sampling probe 11.

[0030] As Figures 2 - 5 shown, a paper feeding module 24, an enrichment detection module 25, a refrigeration module 26 and a main control board for controlling the operation of the above modules are installed on the mounting plate 23.

[0031] The enrichment and detection module 25 includes an integrated base 251, and the base 251 is fixed on the mounting plate 23 by screws. A gap for the paper tape to pass through is provided in the middle of the base 251. The left side of the base 251 is the enrichment station, and the right side of the base 251 is the detection station. A nozzle support 252 is provided at a position above the paper tape at the enrichment station. A sampling nozzle 253 is provided at a position below the paper tape under the nozzle support 252. The sampling nozzle 253 is connected to an internal or external air extraction pump through an air pipe, and the air extraction pump provides the air extraction power for the dust path. A nozzle assembly 254 is installed on the nozzle support 252. A nozzle lifting motor 255 for driving the nozzle assembly 254 to lift and lower is also installed on the base 251. When it is necessary to deposit a dust spot on the paper tape, the nozzle module descends and presses on the sampling nozzle 253 to press the paper tape tightly. When it is necessary to feed the paper, the nozzle module ascends to release the paper tape. A detector 257 fixing frame 256 is provided at a position above the paper tape at the detection station. A radiation source fixing frame is provided at a position below the paper tape at the detection station. The detector 257 is placed in the detector 257 fixing frame 256, and the radiation source 258 is installed in the radiation source fixing frame. The integrated base 251 integrates the dust spot enrichment device and the detection device, and the installation positions of various components are preset on the base 251, which is convenient for precise assembly. The base 251 is integrally fixed on the mounting plate 23, reducing the errors that may occur during the processing and assembly of the enrichment and detection module 25, thereby improving the concentricity and the accuracy of the center distance of the dust spot enrichment device and the detection device, effectively avoiding the detection deviation that may occur during the reciprocating paper feeding detection, and significantly improving the accuracy of the soot monitoring data.

[0032] The nozzle assembly 254 includes an upper nozzle cover 2541 and a nozzle body 2542. The upper nozzle cover 2541 is fixed on the nozzle bracket 252. The upper nozzle cover 2541 is connected to the docking port 22 through a bent pipe 27 and is connected to the dust sampling pipe 12 through the pipeline inside the docking port 22. A heating layer is provided outside the bent pipe 27 to heat the internal soot gas through the heating layer, avoiding the condensation of water vapor carried by the soot and affecting the detection result. The upper part of the nozzle body 2542 is sleeved on the lower end of the upper nozzle cover 2541, and the two are sealed by a sealing ring. The nozzle body 2542 moves up and down driven by a nozzle lifting motor 255. Specifically, a pressure plate 2543 is provided on the outer wall of the nozzle body 2542, and a spring is provided between the pressure plate 2543 and the nozzle bracket 252. The spring presses the nozzle body 2542 downward, so that the nozzle body 2542 presses the paper tape tightly. A cam 2544 is connected to the output shaft of the nozzle lifting motor 255, and the cam 2544 abuts against the lower surface of the pressure plate 2543. When the cam 2544 rotates to the high position, the nozzle body 2542 is pushed upward, so that the nozzle body 2542 is away from the paper tape, and at this time, the paper can be fed. An optoelectronic switch 2546 is installed on the mounting plate 23, and the optoelectronic switch 2546 is electrically connected to the main control board. An optoelectronic detection disk 2545 for triggering the optoelectronic switch 2546 is also connected to the output shaft of the nozzle lifting motor 255. The nozzle lifting motor 255 is electrically connected to the main control board, and the main control board controls the rotation of the nozzle lifting motor 255 through the feedback signal of the optoelectronic switch 2546 to realize the lifting control of the nozzle assembly 254.

[0033] An electric heating grid is installed on the base 251 at a position between the sampling nozzle 253 and the radiation source 258. The paper tape and the dust spots on the paper tape can be dried through the electric heating grid, avoiding the influence of condensed water on the detection result.

[0034] The paper feeding module 24 includes a paper receiving wheel 241, a paper feeding wheel 242 and two tension wheels 243 for receiving and releasing the paper tape. An encoder 244 is installed on one of the tension wheels 243. The paper receiving wheel 241 and the paper feeding wheel 242 both include a wheel shaft 245, and the wheel shaft 245 is driven to rotate by a paper feeding driving device. The paper feeding driving device selects a stepping motor 246, and the stepping motor 246 is electrically connected to the main control board. A spur gear 247 is installed on the wheel shaft 245, and a bidirectional gear damper 248 meshing with the spur gear 247 is provided on the mounting plate 23. The damping effect of the bidirectional gear damper 248 is more stable, which can ensure the damping effect and will not reduce the damping effect due to the increase of time, thus significantly improving the stability and reliability of paper feeding.

[0035] A refrigeration module 26 is further provided on the mounting plate 23. The refrigeration module 26 includes a condensation chamber 261, a thermoelectric cooler 262, a heat sink 263, and a fan 264 that are sequentially attached. An air inlet nozzle 265, an air outlet nozzle 266, and a drain nozzle 267 are provided on the condensation chamber 261. The gas path sampling pipe 13 is connected to the air inlet nozzle 265 through a pipeline. After the flue gas is cooled in the condensation chamber 261, the water vapor condenses into water droplets and remains in the condensation chamber 261. The flue gas is connected to the gas path outlet through the air outlet nozzle 266, and then relevant data is detected by a sensor connected through the gas path outlet. A water pump 268 is further provided on the mounting plate 23. The water pump 268 is connected to the drain nozzle 267 through a pipeline. The condensation chamber 261 is covered with a heat insulation layer to reduce the loss of cold energy. The refrigeration module 26 quickly reduces the temperature of the flue gas collected by the gas path sampling pipe 13 to the ambient temperature, effectively removes the condensed water, ensures the accuracy of subsequent detection data, and can timely discharge the condensed water through the water pump to ensure the water removal effect.

[0036] The above is only a preferred embodiment of the present invention, and it is not a limitation to the present invention in other forms. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, as long as it does not depart from the technical solution content of the present invention, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. An off-site method β-ray direct-reading soot monitoring device, comprising a sampling tube and a sampling mainframe, the sampling tube and the sampling mainframe are connected through an interface, and it is characterized in that: An installation board is arranged inside the sampling host, and a paper feeding module and an enrichment detection module are arranged on the installation board. The enrichment detection module includes a base. A nozzle bracket is arranged on the left side of the base, a sampling nozzle is arranged below the nozzle bracket, a nozzle assembly is installed on the nozzle bracket, and a nozzle lifting motor for driving the nozzle assembly to lift and lower is also installed on the base. An installation groove for a detector is arranged on the right side of the base, a detector is installed in the detector installation groove, and a radiation source is installed below the detector.

2. The beta-ray direct-reading smoke and dust monitoring device by the ectopic method according to claim 1, characterized in that: The paper feeding module includes a paper receiving wheel, a paper feeding wheel and two tension wheels for taking in and paying out the paper tape. An encoder is installed on one of the tension wheels. Both the paper receiving wheel and the paper feeding wheel include a wheel shaft, and the wheel shaft is driven to rotate by a paper feeding driving device. A straight gear is installed on the wheel shaft, and a bidirectional gear damper meshing with the straight gear is arranged on the installation board.

3. The beta-ray direct-reading soot monitoring device by the ectopic method according to claim 1, characterized in that: The nozzle assembly includes a nozzle upper cover and a nozzle body. The nozzle upper cover is fixed on the nozzle bracket, the upper end of the nozzle upper cover is connected to a docking port through a bent pipe, the upper part of the nozzle body is sleeved on the lower part of the nozzle upper cover, and the nozzle body moves up and down driven by the nozzle lifting motor.

4. The beta-ray direct-reading smoke and dust monitoring device by the ectopic method according to claim 3, characterized in that: A pressure plate is arranged on the outer wall of the nozzle body, an elastic body is arranged between the pressure plate and the nozzle bracket, and a cam for pushing the pressure plate is connected to the output shaft of the nozzle lifting motor.

5. The ectopic method β-ray direct-reading smoke monitoring device according to claim 4, characterized in that: A photoelectric switch is installed on the installation board, and a photoelectric detection disk for triggering the photoelectric switch is connected to the output shaft of the motor.

6. The beta-ray direct-reading smoke and dust monitoring device by the ectopic method according to claim 1, characterized in that: An electric heating grid is installed on the base at a position between the sampling nozzle and the radiation source.

7. The beta-ray direct-reading smoke and dust monitoring device by the ectopic method according to claim 1, characterized in that: A refrigeration module is also arranged on the installation board. The refrigeration module includes a condensation chamber, a semiconductor refrigeration chip, a heat sink and a fan. An air inlet nozzle and an air outlet nozzle are arranged on the condensation chamber.

8. The off-site method β-ray direct-reading smoke and dust monitoring device according to claim 7, characterized in that: The condensation chamber is covered with a heat preservation layer.

9. The beta-ray direct-reading smoke and dust monitoring device using the heterotopic method according to claim 1, characterized in that: The sampling tube includes an air path sampling tube, a dust path sampling tube, a pitot tube and a temperature sensor.

10. The beta-ray direct-reading smoke and dust monitoring device using the ectopic method according to claim 3, characterized in that: A heating layer is arranged outside the bent pipe.

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