Calibrating device for high-concentration dust meter

Abstract

The invention relates to the technical field of dust concentration detection, and discloses a high-concentration dust meter calibrating device which comprises a simulation pipe, one end of the top of the simulation pipe is connected with a separation barrel, and the separation barrel and the simulation pipe are arranged in a tangent mode, so that after airflow of the simulation pipe enters the separation barrel, the flow speed becomes slow due to the fact that the flowing space becomes large, and the airflow is separated from the separation barrel. The dust is thrown out to make contact with the inner wall of the separation barrel under the action of centrifugal force due to the fact that the weight of the dust is large in the airflow vortex, and when the dust makes contact with the inner wall of the separation barrel, the dust automatically falls under the action of the gravity due to the fact that the dust loses the inertia effect; the dust falls into the funnel to complete separation, and the entering air is exhausted from the exhaust pipe above, so that automatic sedimentation of the dust is realized, subsequent recycling is facilitated, and the problem that the surrounding environment is influenced by dust flying can be effectively avoided.

Description

Technical Field

[0001] The invention relates to the technical field of dust concentration detection, in particular to a high-concentration dust meter calibration device. Background Art

[0002] Dust concentration detectors are widely used in various industrial applications, including steelmaking, power generation, petroleum, chemical, pharmaceutical, building materials processing, coal mining, cement manufacturing and packaging. There are currently a variety of dust detection methods and dust concentration detectors, which are divided into: laser dust monitors, online continuous monitoring dust monitors, portable dust monitors, etc. The principle of electrostatic charge induction is: dust particles pass through an electrostatic charge sensor with a fixed probe, and the probe induces static charge. The size of the static charge is proportional to the flow rate of dust particles. The signal is amplified by the probe and then transmitted to the monitoring and control system. The amplified signal is then filtered and amplified by the transmitter and processed into a standard output value that is linearly related to the dust content. In order to accurately test the results, the dust concentration detector itself needs to be accurately measured, so it is necessary to test the dust concentration detector itself.

[0003] Chinese patent publication number CN213779824U discloses "a high-concentration dust meter calibration device", a detection cylinder, the detection cylinder has a dust inlet; a powder discharge device, the powder discharge device is arranged on one side of the detection cylinder, the powder discharge device includes a powder discharge nozzle, the powder discharge nozzle faces the dust inlet, a conical cavity is arranged on the powder discharge nozzle, the conical cavity has a large diameter inlet and a small diameter outlet, the large diameter inlet and the small diameter outlet are connected; a lifting platform, the powder discharge device is arranged on the lifting platform. Through the above technical solution, the problem of inaccurate detection in the prior art is solved.

[0004] At present, the calibration of dust concentration monitors is to set up a dust environment in the wind tube, and use a dust concentration meter and a calibration system to measure the dust concentration, and then compare the two to calibrate whether the dust concentration meter is qualified. The commonly used dust concentration meter calibration and calibration devices have poor controllability and are more complicated to operate, which affects the accuracy of the calibration. For example, to simulate a dust environment, it is necessary to prepare the dust in advance and let it flow with the airflow in the detection tube before detection. Since the volume of the detection tube is fixed, when it is necessary to simulate environments of different concentrations, it is generally necessary to control the amount of injected dust to meet the simulation of environments of different concentrations. However, if an open detection tube is used for detection in actual use, it is necessary to continuously output a certain amount of dust for simulation, which is more troublesome and prone to dust leakage. Therefore, a high-concentration dust meter calibration device is proposed to solve the above-mentioned problems. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the present invention provides a high-concentration dust meter calibration device, which solves the problem of dust leakage easily caused by using an open detection tube for detection.

[0007] (II) Technical solution

[0008] To achieve the above object, the present invention provides the following technical solutions: a high-concentration dust meter calibration device, comprising a simulation tube, one end of the top of the simulation tube is connected to a separation barrel for separating and collecting dust;

[0009] One end of the simulation tube below the separation barrel is a curved tube, and a concentration regulating mechanism is provided at the position of the curved tube for regulating the dust concentration inside the simulation tube.

[0010] Preferably, a centrifugal fan is connected to one end of the bottom of the simulation tube, and a pressure relief hole is opened on the right side of the centrifugal fan in the simulation tube. The pressure relief hole is provided to discharge excess air to relieve the pressure in the pipeline. A microwave solid flowmeter is connected to the simulation tube at the right side of the curved tube, and a detection tube is connected to the simulation tube at the right side of the microwave solid flowmeter. The centrifugal fan is started to transport air to the simulation tube to form an airflow, and the dust is carried by the airflow to facilitate the simulation and detection of the dust environment. When the airflow passes through the microwave solid flowmeter, the microwave solid flowmeter generates a microwave field in the pipeline through a sensor based on the physical principle of the Doppler effect. The microwave is reflected by the particles flowing in the pipeline. The changes in frequency and amplitude are calculated to accurately measure the solid flow rate, which is convenient for conversion into a dust concentration value as a standard. The sensing port of the dust concentration detector to be detected is inserted into the detection tube to detect the dust in the simulation tube. The accuracy of the reading of the dust concentration detector is verified by comparing the two sets of values.

[0011] Preferably, the concentration adjustment mechanism comprises a hollow disc, which is connected to the middle position of the curved pipe, and has a connecting port for connecting to the inside of the curved pipe, so that dust can pass through the hollow disc into another section of the curved pipe through the connecting port.

[0012] Preferably, the horizontal section above the simulation tube is arranged tangent to the inner wall of the separation barrel. By arranging the separation barrel and the simulation tube in a tangent manner, after the airflow in the simulation tube enters the separation barrel, the flow velocity will first slow down due to the increase in flow space, and then the incoming airflow will form an airflow vortex through the guidance of the inner wall of the separation barrel.

[0013] Preferably, the top of the separation barrel is connected to an exhaust pipe, and the bottom of the separation barrel is connected to a funnel. The funnel is connected to the interior of the hollow disc through a feeding pipe. In the air flow vortex, due to the large weight of the dust itself, the dust will be thrown out and contact the inner wall of the separation barrel under the action of centrifugal force. When the dust contacts the inner wall of the separation barrel, it loses inertia and automatically falls under the action of its own gravity and falls into the funnel to complete the separation. The incoming air is discharged from the exhaust pipe above to achieve automatic sedimentation of the dust, which is convenient for subsequent recycling and can effectively avoid the problem of dust scattering affecting the surrounding environment.

[0014] Preferably, the inner wall of the hollow disc is rotatably connected to a turntable, and a through hole is opened on the inner wall of the turntable. When the through hole is aligned with the connecting port by rotating the turntable, the air in the bent pipe can circulate normally. When the through hole and the connecting port are not completely offset, the air in the bent pipe cannot enter the inside of the bent pipe on the other side of the hollow disc from the through hole.

[0015] Preferably, there are four through holes, and discharge holes are provided at positions of the outer wall of the turntable corresponding to the through holes, and the apertures of the four discharge holes are arranged in a counterclockwise order from large to small. By setting the discharge holes, when any through hole on the turntable is rotated to a position aligned with the connecting port, the upper discharge hole is connected to the feeding pipe, so that dust falls into the through hole and mixes with the air to facilitate the simulation of the dust environment for detection. Since the discharge holes are distributed in a counterclockwise order from large to small, each time the discharge holes are moved to different positions, the amount of dust mixed in is determined according to the aperture size of the discharge holes, thereby adjusting the dust concentration of the simulated environment to test the performance of the dust concentration detector at different concentrations.

[0016] Preferably, a transmission assembly is provided on the left side of the turntable, and the transmission assembly includes an impeller, the inner wall of the impeller is connected to a rotating rod, the rotating rod passes through the curved pipe and extends to the outside, and is rotatably connected by a bearing at the penetration point, the end of the rotating rod outside the curved pipe is connected to a residual gear, the residual gear is meshed with a transmission gear, the transmission gear is connected to the outer wall of the hollow disc through a support rod, the transmission gear is meshed with a crown gear, one side of the crown gear is connected to a transmission rod, and the transmission rod passes through the hollow disc and is connected to the turntable, when the airflow passes through the impeller, it will drive the impeller to rotate, and the residual gear connected to the rotating rod is driven by the impeller, and the crown gear is driven to rotate through the meshing transmission gear, and the turntable connected to the transmission rod is driven to rotate through the rotation of the crown gear, so as to facilitate the alignment of the through hole with the connection port.

[0017] Preferably, the outer sleeve of the transmission rod is provided with a spring, both ends of the spring are respectively connected with circular rings, and the circular ring at one end of the spring close to the hollow disk is connected to the hollow disk, and the tension of the spring pushes the circular ring to resist the crown gear to generate friction, so that the crown gear stops immediately each time the residual gear is disengaged from the transmission gear, so as to avoid the deviation of the through hole and the connecting port on the turntable caused by the inertial rotation of the crown gear, and the friction force generated by the crown gear will also slow down the transmission speed of the transmission gear to ensure sufficient detection time.

[0018] Preferably, the knocking mechanism includes a windshield, which is arranged inside the simulation tube, and the windshield is hinged to the bottom of the simulation tube through a connecting ball, the bottom of the connecting ball is connected to a connecting rod, the bottom of the connecting rod is connected to a counterweight ball, and the outer wall of the connecting rod is connected to a knocking rod on one side corresponding to the separation barrel. When the airflow passes through the windshield, the airflow will form a driving force on the windshield, which will blow the windshield down, thereby driving the knocking rod connected to the lower connecting rod to lift up. At this time, after the windshield falls down, the area of ​​the airflow acting on the windshield becomes smaller, so that the thrust formed decreases. At this time, the gravity of the counterweight ball is greater than the thrust formed by the airflow, which will drive the knocking rod to press down and knock the separation barrel again, thereby repeatedly knocking the separation barrel to vibrate the separation barrel, so as to facilitate shaking off the adhered dust, so as to avoid the dust adhering to the separation barrel and the inner wall of the funnel, and not continuously falling into the feeding pipe, so that the feeding pipe transports dust intermittently, resulting in unstable dust concentration in the simulated environment.

[0019] (III) Beneficial effects

[0020] Compared with the prior art, the present invention provides a high-concentration dust meter calibration device, which has the following

[0021] Beneficial effects:

[0022] 1. The high-concentration dust meter calibration device arranges the separation barrel and the simulation tube in a tangential manner, so that after the airflow in the simulation tube enters the separation barrel, the flow rate will first slow down due to the increase in flow space, and then the entering airflow will form an airflow vortex through the guidance of the inner wall of the separation barrel. In the airflow vortex, due to the large weight of the dust itself, the dust will be thrown out and contact the inner wall of the separation barrel under the action of centrifugal force. When the dust contacts the inner wall of the separation barrel, it loses inertia and automatically falls under the action of its own gravity and falls into the funnel to complete separation. The incoming air is discharged from the exhaust pipe above to realize the automatic sedimentation of the dust, which is convenient for subsequent recycling and can effectively avoid the problem of dust scattering affecting the surrounding environment.

[0023] 2. The high-concentration dust meter calibration device starts the centrifugal fan to transport air to the simulation tube to form an airflow, and the airflow carries the dust to flow, so as to simulate the dust detection environment. When the airflow passes through the microwave solid flowmeter, the microwave solid flowmeter is based on the physical principle of the Doppler effect. The sensor generates a microwave field in the pipeline. The microwave is reflected by the particles flowing in the pipeline. The changes in frequency and amplitude are calculated to accurately measure the solid flow rate, so as to convert it into a dust concentration value as a standard. The induction port of the dust concentration detector to be detected is inserted into the detection tube to detect the dust in the simulation tube. The accuracy of the readings of the dust concentration detector is verified by comparing the two sets of values, and by setting the discharge holes, when any of the through holes on the turntable is rotated to a position aligned with the connection port, the upper discharge hole is connected to the feed pipe, so that the dust falls into the through hole and mixes with the air to facilitate the simulation of the dust environment for detection. Since the discharge holes are distributed in a counterclockwise order from large to small, each time the discharge holes are moved to different positions, the amount of dust mixed in is determined according to the size of the discharge hole diameter, so that the dust concentration of the simulated environment is adjusted to test the performance of the dust concentration detector at different concentrations.

[0024] 3. The high-concentration dust meter calibration device is equipped with a knocking mechanism. When the airflow passes through the wind shield, the airflow will form a driving force on the wind shield, which will blow the wind shield down, thereby driving the knocking rod connected to the lower connecting rod to lift. At this time, after the wind shield falls down, the area of ​​the airflow acting on the wind shield becomes smaller, so that the thrust formed decreases. At this time, the gravity of the counterweight ball is greater than the thrust formed by the airflow, which will drive the knocking rod to press down and knock the separation barrel again, causing the separation barrel to vibrate, so as to repeatedly knock the separation barrel to facilitate shaking off the adhered dust, so as to avoid the dust adhering to the separation barrel and the inner wall of the funnel, and not continuously falling into the feeding pipe, so that the feeding pipe transports dust intermittently, resulting in unstable dust concentration in the simulated environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is a partial cross-sectional view of the present invention;

[0027] Figure 3 For the present invention Figure 2 A magnified view of A;

[0028] Figure 4 It is a structural schematic diagram of the turntable in the present invention;

[0029] Figure 5 It is a partial cross-sectional view of the separation barrel in the present invention;

[0030] Figure 6 This is a schematic diagram of the crown gear structure in the present invention;

[0031] Figure 7 It is a schematic diagram of the residual gear structure in the present invention;

[0032] Figure 8 For the present invention Figure 2 Enlarged view of B.

[0033] In the figure: 1. simulation tube; 11. centrifugal fan; 111. pressure relief hole; 12. microwave solid flowmeter; 13. detection tube; 14. elbow; 2. separation barrel; 21. funnel; 22. exhaust pipe; 23. feeding pipe; 3. concentration adjustment mechanism; 31. hollow disc; 32. connecting port; 33. turntable; 331. through hole; 332. discharge hole; 4. transmission assembly; 41. impeller; 42. rotating rod; 43. residual gear; 44. transmission gear; 441. support rod; 45. crown gear; 46. transmission rod; 47. ring; 48. spring; 5. knocking mechanism; 51. wind shield; 52. connecting ball; 53. connecting rod; 54. knocking rod; 55. counterweight ball. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example 1

[0036] like Figure 1As shown, a high-concentration dust meter calibration device includes a simulation tube 1, one end of the top of the simulation tube 1 is connected to a separation barrel 2 for separating and collecting dust, one end of the simulation tube 1 below the separation barrel 2 is a bend 14, and a concentration adjustment mechanism 3 is provided at the position of the bend 14 for adjusting the dust concentration inside the simulation tube 1, one end of the bottom of the simulation tube 1 is connected to a centrifugal fan 11, and a pressure relief hole 111 is provided on the right side of the centrifugal fan 11 in the simulation tube 1, and the pressure relief hole 111 is provided to discharge excess air to relieve the pressure in the pipeline, and a microwave solid flowmeter 12 is connected to the simulation tube 1 at the right side of the bend 14, and the simulation tube 1 is at the microwave solid A detection tube 13 is connected to the right side of the solid flow meter 12. The centrifugal fan 11 is started to transport air to the simulation tube 1 to form an airflow. The airflow carries the dust with it to facilitate the simulation of the dust environment. When the airflow passes through the microwave solid flowmeter 12, the microwave solid flowmeter 12 generates a microwave field in the pipeline through a sensor based on the physical principle of the Doppler effect. The microwave is reflected by the particles flowing in the pipeline. The changes in frequency and amplitude are calculated to accurately measure the solid flow rate, which is convenient for conversion into a dust concentration value as a standard. The sensing port of the dust concentration detector to be detected is inserted into the detection tube 13 to detect the dust in the simulation tube 1 and read the reading.

[0037] In this embodiment, the centrifugal fan 11 is started to transport air to the simulation tube 1 to form an airflow, and the dust is carried by the airflow to facilitate the simulation of the dust environment. When the airflow passes through the microwave solid flowmeter 12, the microwave solid flowmeter 12 generates a microwave field in the pipeline through a sensor based on the physical principle of the Doppler effect. The microwave is reflected by the particles flowing in the pipeline. The changes in frequency and amplitude are calculated to accurately measure the solid flow rate, which is convenient for conversion into a dust concentration value as a standard. The sensing port of the dust concentration detector to be detected is inserted into the detection tube 13 to detect the dust in the simulation tube 1, and the accuracy of the dust concentration detector reading is verified by comparing the two sets of values.

[0038] Example 2

[0039] like Figure 2 , Figure 5As shown, the concentration regulating mechanism 3 includes a hollow disc 31, which is connected to the middle position of the curved pipe 14. A connecting port 32 for connecting to the inside of the curved pipe 14 is provided on the hollow disc 31, and the dust can pass through the hollow disc 31 into the other section of the curved pipe 14 through the connecting port 32. The horizontal section above the simulated tube 1 is tangent to the inner wall of the separation barrel 2. The separation barrel 2 and the simulated tube 1 are tangently arranged, so that after the airflow of the simulated tube 1 enters the separation barrel 2, the flow velocity will first be slowed down due to the increase in flow space, and then the entering airflow will form an airflow vortex through the guidance of the inner wall of the separation barrel 2. The top of the separation barrel 2 is connected to the exhaust pipe 22, and the bottom of the separation barrel 2 is connected to the funnel 21. The funnel 21 is connected to the inside of the hollow disc 31 through the feeding pipe 23.

[0040] In this embodiment, the separation barrel 2 and the simulation tube 1 are arranged in a tangential manner, so that after the airflow of the simulation tube 1 enters the separation barrel 2, the flow velocity will first be slowed down due to the increase in the flow space, and then the entering airflow will form an airflow vortex through the guidance of the inner wall of the separation barrel 2. In the airflow vortex, due to the large weight of the dust itself, the dust will be thrown out and contact the inner wall of the separation barrel 2 under the action of centrifugal force. When the dust contacts the inner wall of the separation barrel 2, it loses inertia and automatically falls under the action of its own gravity, falls into the funnel 21 to complete the separation, and the incoming air is discharged from the upper exhaust pipe 22 to realize the automatic sedimentation of the dust, which is convenient for subsequent recycling and can effectively avoid the problem of dust scattering affecting the surrounding environment.

[0041] Example 3

[0042] like Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 7 , Figure 8As shown, the inner wall of the hollow disk 31 is rotatably connected to a turntable 33, and a through hole 331 is provided on the inner wall of the turntable 33. By rotating the turntable 33, when the through hole 331 is aligned with the connecting port 32, the air in the elbow 14 can circulate normally. When the through hole 331 and the connecting port 32 are not completely offset, the air in the elbow 14 cannot enter the elbow 14 on the other side of the hollow disk 31 from the through hole 331. There are four through holes 331. Discharge holes 332 are provided at the positions of the outer wall of the turntable 33 corresponding to the through holes 331, and the apertures of the four discharge holes 332 are arranged counterclockwise from large to small according to the size. By setting the discharge holes 332, when any one of the through holes 331 on the turntable 33 is rotated to a position aligned with the connecting port 32, the upper The discharge hole 332 is connected to the feed pipe 23, so that the dust falls into the through hole 331 and mixes with the air to facilitate the simulation of the dust environment for detection. Since the discharge holes 332 are distributed in a counterclockwise direction from large to small, each time the discharge holes 332 are moved to different positions, the amount of dust mixed in is determined according to the size of the discharge hole 332 aperture, so that the dust concentration of the simulated environment is adjusted to test the performance of the dust concentration detector at different concentrations. A transmission assembly 4 is provided on the left side of the turntable 33. The transmission assembly 4 includes an impeller 41. The inner wall of the impeller 41 is connected to a rotating rod 42. The rotating rod 42 extends through the bent pipe 14 to the outside, and the penetration is rotatably connected by a bearing. The end of the rotating rod 42 outside the bent pipe 14 is connected to a residual gear 43. The residual gear The wheel 43 is meshedly connected with a transmission gear 44, and the transmission gear 44 is connected to the outer wall of the hollow disk 31 through a support rod 441. The transmission gear 44 is meshed with a crown gear 45. A transmission rod 46 is connected to one side of the crown gear 45, and the transmission rod 46 penetrates the hollow disk 31 and is connected to the turntable 33. When the airflow passes through the impeller 41, it will drive the impeller 41 to rotate, and the impeller 41 drives the residual gear 43 connected to the rotating rod 42 to rotate, and the meshed transmission gear 44 drives the crown gear 45 to rotate, and the rotation of the crown gear 45 drives the turntable 33 connected to the transmission rod 46 to rotate, so that the through hole 331 is aligned with the connecting port 32. The residual gear 43 and the transmission gear 44 are intermittently meshed, so that the crown gear 45 meshed with the transmission gear 44 will only rotate each time. The rotating disk 33 is rotated a quarter of a turn, so that the through hole 331 is aligned with the connecting port 32 every time the rotating disk 33 rotates, and a spring 48 is sleeved on the outside of the transmission rod 46. Both ends of the spring 48 are connected with rings 47, and the ring 47 at one end of the spring 48 close to the hollow disk 31 is connected to the hollow disk 31. The tension of the spring 48 pushes the ring 47 to resist the crown gear 45 to generate friction, so that the crown gear 45 stops immediately each time the residual gear 43 and the transmission gear 44 are disengaged, so as to avoid the deviation of the through hole 331 on the rotating disk 33 and the connecting port 32 due to the inertial rotation of the crown gear 45, and the friction generated by the crown gear 45 will also slow down the transmission speed of the transmission gear 44 to ensure that there is enough detection time.The knocking mechanism 5 includes a windshield 51, which is arranged inside the simulation tube 1. The windshield 51 is hinged to the bottom of the simulation tube 1 through a connecting ball 52. The bottom of the connecting ball 52 is connected to a connecting rod 53, and the bottom of the connecting rod 53 is connected to a counterweight ball 55. A knocking rod 54 is connected to the side of the outer wall of the connecting rod 53 corresponding to the separation barrel 2. When the airflow passes through the windshield 51, the airflow will form a driving force on the windshield 51, which will blow the windshield 51 down, thereby driving the knocking rod 54 connected to the lower connecting rod 53 to lift up. At this time, after the windshield 51 falls down, the area of ​​the airflow acting on the windshield 51 becomes smaller, so that the thrust formed decreases. At this time, the gravity of the counterweight ball 55 is greater than the thrust formed by the airflow, which will drive the knocking rod 54 to press down and knock the separation barrel 2 again, causing the separation barrel 2 to vibrate, so as to facilitate the shaking off of the adhered dust, so as to avoid the dust adhering to the separation barrel 2 and the inner wall of the funnel 21, and not continuously falling into the feeding pipe 23, so that the feeding pipe 23 transports dust intermittently, resulting in an unstable dust concentration in the simulated environment.

[0043] In this embodiment, when the airflow passes through the impeller 41, it drives the impeller 41 to rotate, and the impeller 41 drives the residual gear 43 connected to the rotating rod 42, and the meshing transmission gear 44 drives the crown gear 45 to rotate, and the rotation of the crown gear 45 drives the rotating disk 33 connected to the transmission rod 46 to rotate, so that the through hole 331 is aligned with the connecting port 32. The residual gear 43 and the transmission gear 44 are intermittently meshed, so that the crown gear 45 that is meshed with the transmission gear 44 each time will only rotate a quarter of a circle, so that the through hole 331 is aligned with the connecting port 32 every time the rotating disk 33 rotates, and the tension of the spring 48 pushes the ring 47 to resist the crown gear 45 to generate friction, so that after the residual gear 43 and the transmission gear 44 are disengaged each time, the crown gear 45 stops immediately, so as to prevent the crown gear 45 from rotating due to inertia and causing the through hole 331 on the rotating disk 33 to deviate from the connecting port 32, and resist the friction generated by the crown gear 45. The transmission speed of the transmission gear 44 will also be slowed down to ensure sufficient detection time. By rotating the turntable 33, when the through hole 331 is aligned with the connecting port 32, the air in the elbow 14 can circulate normally. When the through hole 331 and the connecting port 32 are not completely offset, the air in the elbow 14 cannot enter the elbow 14 on the other side of the hollow disc 31 from the through hole 331. When any one of the through holes 331 on the turntable 33 is rotated to a position aligned with the connecting port 32, the upper discharge hole 332 is connected to the feed pipe 23, so that dust falls into the through hole 331 and mixes with the air to facilitate the simulation of the dust environment for detection. Since the discharge holes 332 are distributed in a counterclockwise aperture from large to small, each time the discharge holes 332 are moved to different positions, the amount of dust mixed in is determined according to the aperture size of the discharge holes 332, so that the dust concentration of the simulated environment is adjusted to test the performance of the dust concentration detector at different concentrations.

[0044] How it works

[0045] In summary, the high-concentration dust meter calibration device starts the centrifugal fan 11 to transport air to the simulation tube 1 to form an airflow, and the airflow carries the dust to flow, so as to simulate the detection of the dust environment. When the airflow passes through the microwave solid flowmeter 12, the microwave solid flowmeter 12 generates a microwave field in the pipeline through a sensor based on the physical principle of the Doppler effect. The microwave is reflected by the particles flowing in the pipeline. The changes in frequency and amplitude are calculated to accurately measure the solid flow rate, which is convenient for conversion into dust concentration values ​​as a standard. The sensing port of the dust concentration detector to be detected is inserted into the detection tube 13 to detect the dust in the simulation tube 1. The accuracy of the reading of the dust concentration detector is verified by comparing the two sets of values. When the airflow passes through the impeller 41, it will drive The impeller 41 rotates, and the residual gear 43 connected to the rotating rod 42 is driven by the impeller 41, and the crown gear 45 is driven to rotate through the meshing transmission gear 44, and the rotation of the crown gear 45 drives the turntable 33 connected to the transmission rod 46 to rotate, so that the through hole 331 is aligned with the connecting port 32. The residual gear 43 and the transmission gear 44 are intermittently meshed, so that the crown gear 45 meshed with the transmission gear 44 each time only rotates a quarter of a circle, so that the through hole 331 is aligned with the connecting port 32 every time the turntable 33 rotates, and the tension of the spring 48 pushes the ring 47 to resist the crown gear 45 to generate friction, so that the crown gear 45 stops immediately after the residual gear 43 and the transmission gear 44 are disengaged each time, so as to avoid the crown gear 45 from being inertia. The rotation of the turntable 33 causes the through hole 331 on the turntable 33 to deviate from the connecting port 32, and the friction force generated by the crown gear 45 will also slow down the transmission speed of the transmission gear 44 to ensure sufficient detection time. By rotating the turntable 33, when the through hole 331 is aligned with the connecting port 32, the air in the elbow 14 can circulate normally. When the through hole 331 and the connecting port 32 are not completely offset, the air in the elbow 14 cannot enter the elbow 14 on the other side of the hollow disk 31 from the through hole 331. When any one of the through holes 331 on the turntable 33 is rotated to a position aligned with the connecting port 32, the discharge hole 332 above is connected to the feeding pipe 23, so that dust falls into the through hole 331 and mixes with the air to facilitate the simulation of the dust environment for detection. Since the discharge holes 332 are distributed in a counterclockwise order from large to small, each time the discharge holes 332 are moved to different positions, the amount of dust mixed in is determined according to the size of the discharge holes 332, so that the dust concentration of the simulated environment is adjusted to test the performance of the dust concentration detector at different concentrations. The separation barrel 2 and the simulation tube 1 are arranged in a tangential manner, so that after the airflow of the simulation tube 1 enters the separation barrel 2, the flow rate will first be slowed down due to the increase in flow space, and then the entering airflow will form an air vortex through the guidance of the inner wall of the separation barrel 2. In the air vortex, due to the large weight of the dust itself, the dust will be thrown out and contact the inner wall of the separation barrel 2 under the action of centrifugal force. When the dust contacts the inner wall of the separation barrel 2, it loses its inertia.The dust particles are automatically separated by the funnel 21 and discharged from the exhaust pipe 22 above. The separation barrel 2 and the simulation tube 1 are arranged in a tangent manner, so that after the airflow of the simulation tube 1 enters the separation barrel 2, the flow velocity will first be slowed down due to the increase in the flow space, and then the airflow will be guided by the inner wall of the separation barrel 2 to form an air vortex. In the air vortex, due to the large weight of the dust particles themselves, the dust particles will be thrown out and contact the inner wall of the separation barrel 2 under the action of centrifugal force. When the dust particles contact the inner wall of the separation barrel 2, they will automatically fall down under the action of their own gravity due to the loss of inertia, and fall into the funnel 21 to complete the separation. The air particles are discharged from the exhaust pipe 22 above. The automatic settling of dust is convenient for subsequent recycling, and can effectively avoid the problem of dust scattering affecting the surrounding environment. When the airflow passes through the windshield 51, the airflow will form a driving force on the windshield 51, and the windshield 51 will be blown down, thereby driving the knocking rod 54 connected to the lower connecting rod 53 to lift up. At this time, after the windshield 51 falls down, the area of ​​the airflow acting on the windshield 51 becomes smaller, so that the thrust formed decreases. At this time, the gravity of the counterweight ball 55 is greater than the thrust formed by the airflow, which will drive the knocking rod 54 to press down and knock the separation barrel 2 again, thereby repeatedly knocking the separation barrel 2, causing the separation barrel 2 to vibrate, so as to facilitate the shaking off of the adhered dust, so as to avoid the dust adhering to the separation barrel 2 and the inner wall of the funnel 21, and not continuously falling into the feeding pipe 23, so that the feeding pipe 23 transports dust intermittently, resulting in unstable dust concentration in the simulated environment.

[0046] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. A high concentration dust monitor calibration device, characterized in that: It comprises a simulation tube (1), one end of the top of the simulation tube (1) is connected to a separation barrel (2) for separating and collecting dust; One end of the simulation tube (1) below the separation barrel (2) is a curved tube (14), and a concentration adjustment mechanism (3) is provided at the position of the curved tube (14) for adjusting the dust concentration inside the simulation tube (1); A knocking mechanism (5) is provided above the simulation tube (1) for knocking the separation barrel (2); The concentration adjustment mechanism (3) comprises a hollow disc (31), the hollow disc (31) being connected to a middle position on the curved pipe (14), the hollow disc (31) being provided with a connection port (32) for communicating with the interior of the curved pipe (14), the inner wall of the hollow disc (31) being rotatably connected to a rotating disc (33), the inner wall of the rotating disc (33) being provided with a through hole (331).

2. A high concentration dust monitor calibration device according to claim 1, characterized in that: One end of the bottom of the simulation tube (1) is connected to a centrifugal fan (11); a pressure relief hole (111) is provided on the simulation tube (1) at the right side of the centrifugal fan (11); a microwave solid flowmeter (12) is connected to the simulation tube (1) at a position on the right side of the curved tube (14); and a detection tube (13) is connected to the simulation tube (1) at a position on the right side of the microwave solid flowmeter (12).

3. A high concentration dust monitor calibration device according to claim 2, characterized in that: The horizontal section above the simulation tube (1) is arranged tangent to the inner wall of the separation barrel (2).

4. A high concentration dust monitor calibration device according to claim 3, characterized in that: The top of the separation barrel (2) is connected to an exhaust pipe (22), and the bottom of the separation barrel (2) is connected to a funnel (21), and the funnel (21) is connected to the interior of the hollow disc (31) through a feeding pipe (23).

5. A high-concentration dust monitor calibration device according to claim 4, characterized in that: The number of the through holes (331) is four, and the outer wall of the rotating disk (33) is provided with discharge holes (332) at positions corresponding to the through holes (331), and the apertures of the four discharge holes (332) are arranged in descending order in a counterclockwise direction according to their sizes.

6. A high-concentration dust monitor calibration device according to claim 5, characterized in that: A transmission assembly (4) is arranged on the left side of the rotating disk (33). The transmission assembly (4) comprises an impeller (41). The inner wall of the impeller (41) is connected to a rotating rod (42). The rotating rod (42) penetrates the curved tube (14) and extends to the outside. The penetration portion is rotatably connected via a bearing. One end of the rotating rod (42) outside the curved tube (14) is connected to a residual gear (43). The residual gear (43) is meshedly connected with a transmission gear (44). The transmission gear (44) is connected to the outer wall of the hollow disc (31) via a support rod (441). The transmission gear (44) is meshed with a crown gear (45). One side of the crown gear (45) is connected to a transmission rod (46). The transmission rod (46) penetrates the hollow disc (31) and is connected to the rotating disk (33).

7. A high-concentration dust monitor calibration device according to claim 6, characterized in that: The transmission rod (46) is sleeved with a spring (48) on its exterior, and both ends of the spring (48) are respectively connected to circular rings (47), and the circular ring (47) at one end of the spring (48) close to the hollow disc (31) is connected to the hollow disc (31).

8. The high-concentration dust monitor calibration device according to claim 1, characterized in that: The knocking mechanism (5) comprises a driving member and a contact member, wherein the driving member comprises a windshield (51), wherein the windshield (51) is arranged inside the simulation tube (1), and the airflow passing through the simulation tube (1) will drive the windshield (51) to move, wherein the windshield (51) is hinged to the bottom of the simulation tube (1) via a connecting ball (52), wherein the bottom of the connecting ball (52) is connected to a connecting rod (53), and the connecting rod (53) is connected to the contact member.

9. A high-concentration dust monitor calibration device according to claim 8, characterized in that: The contact member comprises a weighted ball (55), the bottom of the connecting rod (53) is connected to the weighted ball (55), and a knocking rod (54) is connected to one side of the outer wall of the connecting rod (53) corresponding to the separation barrel (2).

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