Calibration device and calibration method for mining light scattering principle dust sensor

Abstract

The invention discloses a calibration device and a calibration method for a mining light scattering principle dust sensor. The calibration device comprises a fuming cavity, a detection cavity and a filtering cavity, the fuming cavity comprises a fuming sheet, and solid aerosol is generated by burning the fuming sheet; the detection cavity is provided with a detection cavity air inlet, a calibrated dust detection module, a circulating air pump, a detection cavity filtering module, an air extracting pump and a three-position two-way valve; the first three-position two-way valve is used for switching the path of airflow output by the circulating air pump so as to selectively guide airflow to the calibrated dust detection module or the filtering cavity. The three-position two-way valve II is used for switching an input source of the sucking pump so as to select smoke dust sucked into the smoke generating cavity or clean air outside through the detection cavity filtering module and the detection cavity air inlet; the three-position two-way valve III is used for switching an output path of the sucking pump so as to selectively output the airflow to the detection cavity or the filtering cavity; activated carbon is arranged in the filter cavity and used for adsorbing solid particles and harmful aerosol flowing through gas. The method replaces a dust fan drift to calibrate the dust sensor.

Description

Technical Field

[0001] This invention relates to the technical field of monitoring devices, and in particular to a calibration device and calibration method for a dust sensor based on the principle of light scattering used in mining. Background Technology

[0002] Currently, common dust sensors based on the light scattering principle used in mining are typically calibrated using the following steps: First, the dust sensor to be tested is placed in a ventilation shaft simulating a dusty environment; second, by setting the sampling flow rate and time of the dust sampler in the ventilation shaft, the dust-laden airflow is sampled, and the dust in the air will be adsorbed onto the filter membrane; third, based on the weight change of the filter membrane before and after dust absorption and the volume absorbed by the dust sampler, the concentration information of the current environmental dust is calculated; finally, this value is used to calibrate the dust sensor to be tested.

[0003] However, for mines using dust sensors, the large size and high cost of dust ventilation shafts often prevent the purchase of such equipment, thus hindering regular dust calibration. Secondly, the aforementioned calibration method requires a high degree of stability in the simulated dust environment; in practice, the dust-generating device is prone to clogging, leading to uneven dust generation. If the simulated dust concentration cannot be kept stable during calibration, it directly affects the success of the dust sensor calibration. Thirdly, the entire calibration process is cumbersome; dust generated during testing will contaminate the sensor's appearance, requiring additional wiping and cleaning steps. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0005] To address this, the present invention proposes a calibration device and method for a dust sensor based on the principle of light scattering in mining. The calibration device has a convenient structure and uses a solid aerosol with strong light scattering ability to replace coal dust. The dust concentration sensor to be calibrated and the calibrated dust detection module are placed in the same space. The data of the dust concentration sensor to be calibrated is adjusted according to the data measured by the calibrated dust detection module, thus replacing the use of a dust ventilation shaft to calibrate the dust sensor.

[0006] A calibration device for a dust sensor based on the light scattering principle in mining, according to an embodiment of the present invention, includes a smoke-generating chamber, a detection chamber, and a filter chamber. The smoke-generating chamber includes a smoke-generating inlet and a smoke-generating plate, which generates a solid aerosol by burning the smoke-generating plate. The detection chamber is equipped with a detection chamber inlet, a calibrated dust detection module, a circulating air pump, a detection chamber filter module, a suction pump, and a three-position two-way valve for controlling the airflow direction. The detection chamber inlet and the detection chamber filter module are used to provide clean air to the detection chamber through the suction pump. The three-position two-way valve includes: a three-position two-way valve one, used for switching... The circulating air pump outputs airflow along a path to select whether to direct the airflow to the calibrated dust detection module or the filter chamber; a two-position two-way valve is used to switch the input source of the suction pump to select whether to draw in smoke from the smoke-generating chamber or clean air from the outside that has passed through the detection chamber filter module and the detection chamber inlet; a three-position two-way valve is used to switch the output path of the suction pump to select whether to output airflow to the detection chamber or the filter chamber; the filter chamber is provided with a filter chamber outlet; the filter chamber contains activated carbon to adsorb solid particulate matter and harmful aerosols in the flowing gas, and discharges them through the filter chamber outlet to the calibration device.

[0007] This invention also provides a calibration method for a calibration device applied to a dust sensor based on the principle of light scattering in mining applications, comprising the following steps: Step 1, generating a solid aerosol: igniting a smoke generator in a smoke chamber to generate a solid aerosol; Step 2, starting calibration: connecting the dust concentration sensor to be calibrated to the detection chamber and starting the calibration program; Step 3, performing zeroing operation: introducing clean air into the detection chamber, and waiting for the concentration value to stabilize at around 0 and not greater than 2, sending a zeroing command to the dust concentration sensor to be calibrated; Step 4, performing linearity adjustment operation: dynamically adjusting the mixing ratio of smoke and clean air in the smoke chamber to stabilize the concentration at the midpoint of the range of the dust concentration sensor to be calibrated, and sending a linearity adjustment command.

[0008] The beneficial effects of this invention are as follows: The calibration device and calibration method for a dust sensor based on the principle of light scattering used in mining have the following advantages:

[0009] I. A calibration device for dust sensors based on the principle of light scattering in mining, which replaces the use of dust ventilation shafts for calibrating dust sensors, greatly saves manpower and financial resources for users who need to calibrate dust sensors regularly;

[0010] Second, the calibration device can automatically perform zeroing and linearity adjustment of the dust concentration sensor to be calibrated through infrared and wireless interaction, without manual intervention, making it intelligent and efficient.

[0011] Third, the reliable automatic smoke extraction and filtration function prevents operators from inhaling toxic and harmful gases in the smoke, ensuring safety and reliability.

[0012] According to one embodiment of the present invention, the smoke generating chamber further includes: a detachable smoke generating chamber filter module for screening solid particles of different sizes; and a one-way valve connected to the air inlet of the smoke generating chamber to prevent smoke and dust from leaking out and to maintain the negative pressure balance of the chamber.

[0013] According to one embodiment of the present invention, the circulating air pump provides a constant flow rate; the second three-position two-way valve dynamically switches the input source of the air pump based on the concentration data of the dust detection module; the third three-position two-way valve dynamically switches the output path of the air pump based on the concentration data of the dust detection module.

[0014] According to one embodiment of the present invention, the detection chamber is further provided with a three-way valve for connecting three-position two-way valve one and three-position two-way valve three to realize gas path diversion.

[0015] According to one embodiment of the present invention, the calibration device is equipped with an infrared or wireless communication module for sending zeroing and linearity adjustment commands to the dust concentration sensor to be calibrated.

[0016] According to one embodiment of the present invention, in step 3, the zeroing operation specifically includes: step 3-1, the air pump draws clean air from the outside through the detection chamber filter module and the detection chamber air inlet and inputs it into the detection chamber; step 3-2, the circulating air pump drives the airflow through the calibrated dust detection module and the dust concentration sensor to be calibrated to form a closed loop; step 3-3, after stabilization, the zeroing command is triggered.

[0017] According to an embodiment of the present invention, in step 4, the linear adjustment operation specifically includes: step 4-1, the air pump switches the input source twice through a three-position two-way valve based on the real-time data of the calibrated dust detection module; step 4-2, when the concentration is lower than the set value, it draws in the smoke from the smoke generation chamber; when the concentration is higher than the set value, it draws in clean air; step 4-3, the concentration is stabilized at 50% ± 5% of the full scale of the dust concentration sensor to be calibrated, and the linear adjustment command is triggered after stabilization.

[0018] According to one embodiment of the present invention, the method further includes a fifth step: smoke exhaust: the smoke from the smoke generation chamber and the circulating air pump are drawn into the filter chamber through a three-position two-way valve and a three-way fitting by an air extraction pump, and discharged after being adsorbed by activated carbon; at the same time, the air extraction pump selects a clean air source from the outside through the three-position two-way valve to inject clean air into the detection chamber for cleaning, so as to avoid the formation of negative pressure in the detection chamber.

[0019] According to one embodiment of the present invention, when exhausting smoke, a negative pressure is formed in the smoke generating chamber, triggering a one-way valve to replenish outside air and maintain air pressure balance.

[0020] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the calibration device of the present invention. Figure 1 ;

[0024] Figure 2 This is a schematic diagram of the calibration device of the present invention. Figure 2 ;

[0025] Figure 3 This is a flowchart of the calibration method of the present invention;

[0026] Figure 4 This is a flowchart of the zeroing operation;

[0027] Figure 5 This is a flowchart of the linear adjustment operation;

[0028] Figure 6 This is the logic diagram for gas path control.

[0029] The labels in the diagram are as follows: 1. Handle; 2. Display screen; 3. Detection chamber; 4. Smoke chamber; 5. Observation glass; 6. Smoke chamber air inlet; 7. Combustion plate; 8. Smoke generator; 9. Observation chamber switch handle; 10. Detection inlet; 11. Detection chamber air inlet; 12. Dust concentration sensor to be calibrated; 13. Activated carbon; 14. Filter chamber air outlet; 15. Filter chamber; 16. Detection outlet; 17. Air connector; 18. One-way valve; 19. Detachable smoke chamber filter module; 20. Detection chamber inlet; 21. Calibrated dust detection module; 22. Three-position two-way valve one; 23. Circulating air pump; 24. Filter chamber air inlet; 25. Three-way fitting; 26. Detection chamber filter module; 27. Three-position two-way valve two; 28. Suction pump; 29. ​​Three-position two-way valve three. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be understood that the terms "one side", "the other side", "both sides", "between", "middle", "upper end", "lower end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] The calibration device and method for a dust sensor based on the principle of light scattering used in mining, according to an embodiment of the present invention, are described in detail below with reference to the accompanying drawings. The calibration device has a convenient structure and uses a solid aerosol with strong light scattering ability to replace coal dust. The dust concentration sensor 12 to be calibrated and the calibrated dust detection module 21 are placed in the same space. The data of the dust concentration sensor 12 to be calibrated is adjusted according to the data measured by the calibrated dust detection module 21, which replaces the use of a dust ventilation shaft to calibrate the dust sensor.

[0034] See Figure 1 and Figure 2 The present invention provides a calibration device for a dust sensor based on the principle of light scattering in mining, comprising a smoke-generating chamber 4, a detection chamber 3, and a filter chamber 15.

[0035] The smoke chamber 4 includes a smoke chamber inlet 6 and a smoke generator 8, and solid aerosols are generated by burning the smoke generator 8.

[0036] The detection chamber 3 is equipped with a detection chamber air inlet 11, a calibrated dust detection module 21, a circulating air pump 23, a detection chamber filter module 26, an air extraction pump 28, and a three-position two-way valve for controlling the airflow direction.

[0037] The detection chamber air inlet 11 and the detection chamber filter module 26 are used to supply clean air to the detection chamber 3 via the air pump 28. The calibrated dust detection module 21 is used to detect the dust concentration value of the current environment.

[0038] Preferably, the circulating air pump 23 provides a constant flow rate; the three-position two-way valve 27 dynamically switches the input source of the suction pump 28 according to the concentration data of the dust detection module 21; the three-position two-way valve 29 dynamically switches the output path of the suction pump 28 according to the concentration data of the dust detection module 21.

[0039] Preferably, the detection chamber 3 is also provided with a three-way valve 25, which is used to connect the three-position two-way valve 22 and the three-position two-way valve 29 to realize gas path diversion, so as to discharge the waste smoke from the smoke generation chamber 4 after testing and the waste smoke from the detection chamber 3 to the filter chamber 15.

[0040] Preferably, the calibration device is equipped with an infrared or wireless communication module for sending zeroing and linearity adjustment commands to the dust concentration sensor 12 to be calibrated.

[0041] The three-position two-way valve includes three-position two-way valve one 22, three-position two-way valve two 27, and three-position two-way valve three 29. Three-position two-way valve one 22 is used to switch the path of the airflow output from the circulating air pump 23 to select whether to direct the airflow to the calibrated dust detection module 21 or the filter chamber 15. Three-position two-way valve two 27 is used to switch the input source of the suction pump 28 to select whether to draw in smoke from the smoke-generating chamber 4 or clean air from the outside that has passed through the detection chamber filter module 26 and the detection chamber inlet 11. Three-position two-way valve three 29 is used to switch the output path of the suction pump 28 to select whether to output airflow to the detection chamber 3 or the filter chamber 15.

[0042] In other words, see Figure 6 Three-position two-way valve 22 is used to select whether the dust-laden airflow output by the circulating air pump 23 is discharged to the calibrated dust detection module 21 or flows into the filter chamber 15 through the three-way fitting 25 and the filter chamber inlet 24. The circulating air pump 23, as a power source, outputs a flow rate of 2L / min to circulate the dust-laden airflow. Three-position two-way valve 27 is used to select whether the input source of the extraction pump 28 is the dust-laden airflow in the smoke generation chamber 4 or the clean air from the outside through the detection chamber inlet 11 and the detection chamber filter module 26. Three-position two-way valve 29 is used to select whether the output source of the extraction pump 28 is discharged to the detection chamber 3 or flows into the filter chamber through the three-way fitting 25 and the filter chamber inlet 24. The extraction pump 28 mainly adjusts the dust concentration in the detection chamber 3. When the displayed dust concentration is low, it selects to draw in solid particulate aerosols from the smoke generation chamber 4; when the displayed dust concentration is high, it selects to draw in outside air.

[0043] The filter chamber 15 is equipped with a filter chamber outlet 14. Activated carbon 13 is installed inside the filter chamber 15 to adsorb solid particulate matter and harmful aerosols in the flowing gas, and these are discharged from the calibration device through the filter chamber outlet 14. In other words, the filter chamber 15 includes the filter chamber outlet 14 and the activated carbon 13. The activated carbon 13 mainly adsorbs and filters solid particulate matter flowing into the filter chamber 15, preventing operators from directly inhaling irritating fumes.

[0044] Preferably, the smoke-generating chamber 4 further includes a detachable smoke-generating chamber filter module 19 and a one-way valve 18. The detachable smoke-generating chamber filter module 19 is used to screen solid particles of different sizes, preventing larger dust particles from entering the rear-end suction pump 28 and causing blockage. In addition, by selecting different models of the detachable smoke-generating chamber filter module 19, smoke of different particle sizes can be generated, thereby creating a detection environment for total dust and respirable dust sensors. It should be noted that dust sensors are divided into total dust concentration sensors and respirable dust concentration sensors according to different dust particle sizes. Total dust refers to the sum of mineral dust of various particle sizes. For coal mine environments, the total dust particle size is usually no greater than 100μm, and the respirable dust particle size is no greater than 7.07μm. The dust particle size can be screened by the filter device. The one-way valve 18 is used to connect to the smoke-generating chamber inlet 6 to prevent smoke leakage and maintain the negative pressure balance of the chamber.

[0045] In other words, the smoke chamber inlet 6 and the one-way valve 18 are mainly used for the flow of gas during the exhaust process and to ensure that the generated solid dust particles do not escape from the smoke chamber 4 into the external environment.

[0046] Preferably, the smoke-generating chamber 4 further includes an observation glass 5, a combustion plate 7, and an observation chamber switch handle 9. The observation glass 5 is made of tempered glass to facilitate observation of the smoke in the smoke-generating chamber 4. The combustion plate 7 is used to hold the burning smoke-generating plates 8. The observation chamber switch handle 9 is used to load and unload the smoke-generating plates 8, ensuring the airtightness of the smoke-generating chamber 4.

[0047] Preferably, the detection chamber 3 is further provided with a detection inlet 10 and a detection outlet 16, which are used to connect to the dust concentration sensor 12 to be calibrated, forming an airflow circuit.

[0048] Preferably, the calibration device is provided with a handle 1 on the top for easy carrying.

[0049] Preferably, the calibration device is also provided with an aviation connector 17 for reliable connection of electrical circuits.

[0050] See Figure 3 The present invention discloses a calibration method for a calibration device applied to a dust sensor based on the principle of light scattering in mining, comprising the following steps:

[0051] Step 1: Generate solid aerosol: Ignite the smoke generator 8 in the smoke chamber 4 to generate solid aerosol; specifically, ignite the smoke generator 8 and place it in the combustion plate 7, let it stand for 3 minutes, and wait for the smoke to fill the entire smoke chamber 4.

[0052] Step 2, Start Calibration: Connect the dust concentration sensor 12 to be calibrated to the detection chamber 3 and start the calibration program; specifically, connect the dust concentration sensor 12 to the two connection ports of the detection chamber, which are the detection inlet 10 and the detection outlet 16, respectively. Click "Start Calibration" on the interactive screen. The calibration device uses infrared or wireless means to put the dust concentration sensor 12 to be calibrated into the calibration mode. The calibration operation includes zeroing and linearity adjustment.

[0053] Step 3, Zeroing Operation: Clean air is introduced into the detection chamber 3. Once the concentration value stabilizes at 0, a zeroing command is sent to the dust concentration sensor 12 to be calibrated. The zeroing operation includes: Step 3-1, the air pump 28 draws clean air from the detection chamber filter module 26 and the detection chamber air inlet 11 and inputs it into the detection chamber 3; Step 3-2, the circulating air pump 23 pushes the airflow through the calibrated dust detection module 21 and the dust concentration sensor 12 to be calibrated, forming a closed loop; Step 3-3, the zeroing command is triggered after stabilization for 3 minutes.

[0054] Specifically, see Figure 4 The suction pump 28 selects the detection chamber filter module 26 and the detection chamber air inlet 11 as the clean air input source, and discharges it into the entire detection chamber 3 through the three-position two-way valve 29, simulating that the dust concentration sensor 12 to be calibrated is in clean air. The circulating air pump 23 draws clean air from the detection chamber 3 through the three-position two-way valve 22, passes it through the internally calibrated dust detection module 21, outputs it to the dust concentration sensor 12 to be calibrated, and then returns it to the detection chamber 3, forming an airflow circulation. After 3 minutes, when the value on the display screen 2 stabilizes at 0, the calibration device issues a zeroing operation to the dust concentration sensor 12 to be calibrated.

[0055] Step 4: Perform linearity adjustment: Dynamically adjust the mixing ratio of smoke and clean air in the smoke-generating chamber 4 to stabilize the concentration at the midpoint of the range of the dust concentration sensor 12 to be calibrated, and send a linearity adjustment command. The linearity adjustment operation includes: Step 4-1: The air pump 28 switches the input source through the three-position two-way valve 27 according to the real-time data of the calibrated dust detection module 21; Step 4-2: When the concentration is lower than the set value, it draws in smoke from the smoke-generating chamber 4; when the concentration is higher than the set value, it draws in clean air; Step 4-3: Stabilize the concentration at 50% ± 5% of the full range of the dust concentration sensor 12 to be calibrated, and trigger the linearity adjustment command after stabilizing for 3 minutes.

[0056] Specifically, see Figure 5The air pump 28 automatically selects the three-position two-way valve 27 based on the value uploaded to the display screen 2 from the internally calibrated dust detection module 21. Specifically, it selects either clean air from the outside environment passing through the detection chamber filter module 26 and the detection chamber inlet 11, or smoke from the detachable smoke-generating chamber filter module 19 and the detection chamber inlet 20, as the input source. The value is stabilized at half the full-scale range of the dust concentration sensor 12 to be calibrated. When the range of the dust concentration sensor 12 to be calibrated is 0-1000 mg / m³... 3 The set value is 500 mg / m³. 3 When the displayed dust concentration is lower than the set value, solid particulate aerosols are drawn into the smoke-generating chamber 4; when the displayed dust concentration is too high, outside air is drawn in. After waiting 3 minutes for the value returned by the calibrated dust detection module 21 to stabilize at 500, the calibration device issues a linearity adjustment operation to the dust concentration sensor 12 to be calibrated. The detection chamber inlet 20 is a three-way valve for conveying smoke and dust between the smoke-generating chamber 4 and the detection chamber 3.

[0057] Step 5: Smoke Exhaust: The smoke from the smoke-generating chamber 4 and the circulating air pump 23 is drawn into the filter chamber 15 via the three-position two-way valve 22 and the three-way fitting 25 using the suction pump 28. After being adsorbed by the activated carbon 13, the smoke is discharged. Simultaneously, the suction pump 28 selects a clean air source from the outside through the three-position two-way valve 27 to inject clean air into the detection chamber 3 for cleaning, preventing negative pressure from forming in the detection chamber 3. During smoke exhaust, if negative pressure forms in the smoke-generating chamber 4, it triggers the one-way valve 18 to replenish outside air and maintain pressure balance.

[0058] Specifically, after completing the above calibration operation, in order to ensure the long-term use of the calibration device and to prevent operators from inhaling the smoke generated by the device, the smoke in the smoke-generating chamber 4 and the detection chamber 3 needs to be discharged. First, the smoke in the smoke-generating chamber 4 is discharged. The vacuum pump 28 runs for 3 minutes. The detachable smoke-generating chamber filter module 19 and the detection chamber inlet 20 are selected as the input source through the three-position two-way valve 27. The airflow containing smoke is discharged to the filter chamber 15 through the three-position two-way valve 29, which selects the three-way component 25 and the filter chamber inlet 24. When the sealed smoke-generating chamber 4 is drawn into negative pressure by the vacuum pump 28 and reaches the starting pressure of the one-way valve 18, the outside air will be replenished into the smoke-generating chamber. Next, the smoke and dust in the detection chamber are discharged. Simultaneously, the suction pump 28 and the circulating pump 23 are activated. The circulating pump 23 discharges the airflow containing smoke and dust from the detection chamber through the three-position two-way valve 22, the detection chamber inlet 20, and the filter chamber inlet 24 to the filter chamber 15. After being adsorbed by activated carbon 13, the airflow is discharged from the calibration device through the exhaust port 25. Furthermore, the suction pump 28 selects the detection chamber filter module 26 and the detection chamber inlet 11 as its input source through the two-position two-way valve 27. Clean air flows into the detection chamber 3 through the three-position two-way valve 39, balancing the air pressure in the detection chamber 3 and cleaning it with the filtered clean air.

[0059] It should be noted that:

[0060] In the field of dust sensor calibration for mining applications, zeroing refers to the technical process of calibrating the output value of the dust concentration sensor 12 to be calibrated to zero in clean air.

[0061] In the field of dust sensor calibration for mining applications, linearity adjustment refers to the technical process of calibrating the output linearity of the dust concentration sensor 12 to be calibrated at a specific concentration point.

[0062] The calibration device for a dust sensor based on the light scattering principle in mining, as described in this invention, replaces the use of dust ventilation shafts for calibrating dust sensors, greatly saving manpower and financial resources for users who need to periodically calibrate dust sensors. The calibration device can automatically perform zeroing and linearity adjustment operations on the dust concentration sensor 12 to be calibrated through infrared and wireless interaction, without manual intervention, making it intelligent and efficient. The reliable automatic smoke extraction and filtration function prevents operators from inhaling toxic and harmful gases in the smoke, ensuring safety and reliability.

[0063] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A calibration device for a dust sensor based on the principle of light scattering used in mining, characterized in that, include: Smoke-generating chamber (4), detection chamber (3), and filter chamber (15); The smoke chamber (4) includes a smoke chamber inlet (6) and a smoke plate (8), and solid aerosol is generated by burning the smoke plate (8); The detection chamber (3) is equipped with a detection chamber air inlet (11), a calibrated dust detection module (21), a circulating air pump (23), a detection chamber filter module (26), an air extraction pump (28), and a three-position two-way valve for controlling the airflow direction. The air inlet (11) of the detection chamber and the filter module (26) of the detection chamber are used to provide clean air to the detection chamber (3) through the air pump (28); The three-position two-way valve includes: Three-position two-way valve 1 (22) is used to switch the path of the airflow output by the circulating air pump (23) to select whether to direct the airflow to the calibrated dust detection module (21) or the filter chamber (15); The three-position two-way valve (27) is used to switch the input source of the air pump (28) to select the smoke and dust drawn into the smoke chamber (4) or the clean air from the outside through the detection chamber filter module (26) and the detection chamber air inlet (11). The three-position two-way valve (29) is used to switch the output path of the air pump (28) to select whether to output airflow to the detection chamber (3) or the filter chamber (15); The filter chamber (15) is provided with a filter chamber outlet (14); The filter chamber (15) contains activated carbon (13) to adsorb solid particles and harmful aerosols in the gas flowing through it, and discharges them through the outlet (14) of the filter chamber to the calibration device.

2. The calibration device for a dust sensor based on the principle of light scattering used in mining, as described in claim 1, is characterized in that... The smoke-generating chamber (4) also includes: A detachable smoke chamber filter module (19) is used to screen solid particles of different sizes; A one-way valve (18) is connected to the air inlet (6) of the smoke-generating chamber to prevent smoke and dust from leaking out and to maintain the negative pressure balance of the chamber.

3. The calibration device for a dust sensor based on the principle of light scattering used in mining, as described in claim 1, is characterized in that: The circulating air pump (23) provides a constant flow rate; The three-position two-way valve (27) dynamically switches the input source of the air pump (28) based on the concentration data of the dust detection module (21); The three-position two-way valve (29) dynamically switches the output path of the air pump (28) based on the concentration data from the dust detection module (21).

4. The calibration device for a dust sensor based on the principle of light scattering used in mining, as described in claim 3, is characterized in that... The detection cavity (3) is also provided with: A three-way valve (25) is used to connect three-position two-way valve one (22) and three-position two-way valve three (29) to achieve gas flow splitting.

5. The calibration device for a dust sensor based on the principle of light scattering used in mining, as described in claim 1, is characterized in that... The calibration device is equipped with an infrared or wireless communication module for sending zeroing and linearity adjustment commands to the dust concentration sensor (12) to be calibrated.

6. A calibration method for a calibration device applied to a dust sensor based on the light scattering principle used in mining as described in any one of claims 1-5, characterized in that, Includes the following steps: Step 1: Generate solid aerosol: Ignite the smoke generator (8) in the smoke chamber (4) to generate solid aerosol; Step 2, Start Calibration: Connect the dust concentration sensor (12) to be calibrated to the detection chamber (3) and start the calibration program; Step 3, perform zeroing operation: introduce clean air into the detection chamber (3), wait for the concentration value to stabilize at around 0 and not greater than 2, and send a zeroing command to the dust concentration sensor (12) to be calibrated; Step 4: Perform linear adjustment operation: dynamically adjust the mixing ratio of smoke and clean air in the smoke chamber (4), stabilize the concentration at the midpoint of the range of the dust concentration sensor (12) to be calibrated, and send the linear adjustment command.

7. The calibration method as described in claim 6, characterized in that, In step 3, the zeroing operation specifically includes: Step 3-1: The air pump (28) draws clean air from the outside through the detection chamber filter module (26) and the detection chamber air inlet (11) and inputs it into the detection chamber (3); Step 3-2: The circulating air pump (23) drives the airflow through the calibrated dust detection module (21) and the dust concentration sensor (12) to be calibrated, forming a closed loop; Step 3-3: Trigger the zeroing command after stabilization.

8. The calibration method as described in claim 6, characterized in that, In step 4, the linear adjustment operation specifically includes: Step 4-1: The air pump (28) switches the input source through the three-position two-way valve (27) based on the real-time data from the calibrated dust detection module (21). Step 4-2: When the concentration is lower than the set value, smoke and dust are inhaled from the smoke-generating chamber (4); when the concentration is higher than the set value, clean air is inhaled. Step 4-3: Stabilize the concentration at 50% ± 5% of the full scale of the dust concentration sensor (12) to be calibrated, and trigger the linearity adjustment command after stabilization.

9. The calibration method as described in claim 6, characterized in that, It also includes step 5, smoke extraction: The smoke from the smoke-generating chamber (4) and the circulating air pump (23) is drawn into the filter chamber (15) through the three-position two-way valve (22) and the three-way fitting (25) by the air pump (28). After being adsorbed by the activated carbon (13), the smoke is discharged. At the same time, the air pump (28) selects a clean air source from the outside through the three-position two-way valve (27) to inject clean air into the detection chamber (3) for cleaning, so as to avoid the formation of negative pressure in the detection chamber (3).

10. The calibration method as described in claim 9, characterized in that, When exhausting smoke, the smoke-generating chamber (4) forms a negative pressure, triggering the one-way valve (18) to replenish outside air and maintain air pressure balance.

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