Particulate matter sensor calibration device and calibration method

Abstract

The application provides a particulate matter sensor calibration device and a calibration method, the device comprising a calibration cabin, a gas generating mechanism, an adjusting assembly and a positioning mechanism; the calibration cabin is provided with a reference sensor; the gas generating mechanism is connected with the calibration cabin through a pipeline and is used for conveying a preset volume of high-concentration particulate matter gas into the calibration cabin; the positioning mechanism is arranged in the calibration cabin and is used for mounting a sensor to be calibrated; the adjusting assembly is used for filling the space where the sensor to be calibrated is located with particulate matter gas of a preset concentration; the positioning mechanism is provided with mounting positions which are sequentially distributed along the direction of gravity, and all the sensors to be calibrated are sequentially mounted on the corresponding mounting positions; during calibration, the particulate matter gas first settles at the bottom of the calibration cabin, the adjusting assembly can pump the preset volume of particulate matter gas to reciprocally contact the sensor to be calibrated at a uniform speed, the concentration of the particulate matter gas is automatically adjusted by setting the pumping power of the adjusting assembly, the adjusting time is reduced, the calibration efficiency is improved, and the operation cost is reduced.

Description

Technical Field

[0001] This invention belongs to the field of sensor calibration technology, specifically relating to a particulate matter sensor calibration device and calibration method. Background Technology

[0002] The particulate gas sensor includes a laser source and a photodetector. The photodetector collects the intensity of scattered light in real time. When air containing particulate matter flows through the sensor duct, the particulate matter in the air causes laser scattering. The photodetector collects the change in the intensity of the scattered light, and the subsequent acquisition circuit calculates the equivalent particle size and the number of particles of different sizes per unit volume based on Mie theory.

[0003] Regarding the gas operation principle of the aforementioned particulate matter sensors, CN106769724B discloses a particulate matter sensor calibration system, which includes a calibration system for nanoscale and microscale particulate matter sensors. This system comprises a particulate matter generator, a dilution and mixing subsystem, an experimental chamber, and a data acquisition and analysis system. It can evaluate and calibrate particulate matter sensors for PM1.0, PM2.5, and PM10. For particulate matter sensors measuring different particle size ranges, a corresponding particulate matter generator is used to produce polydisperse particles. During calibration, sensors are symmetrically distributed within the experimental chamber, and the particulate matter concentration is dynamically adjusted by regulating different flow dilution ratios to achieve rapid calibration and improve calibration efficiency. The sensor measurement values ​​are acquired in real-time by the data acquisition motherboard and uploaded to the server for storage and analysis. The system uses compression fittings and rubber ring seals to ensure the airtightness of the pipelines. The experimental chamber maintains a slightly positive pressure testing environment, protecting the experimental environment from external influences.

[0004] In the above calibration system, the particulate matter concentration in the experimental chamber is adjusted by flow control. With the flow control adjustment method, the particulate gas input and output operate at different power at the same time. This dynamic balance adjustment method requires a lot of adjustment time, which affects the calibration efficiency.

[0005] In the aforementioned calibration system, particulate gas is input and output simultaneously, resulting in a significant waste of calibration gas and inflated calibration costs. Furthermore, the wasted particulate gas requires purification using a filtration unit, further increasing the operational costs of the calibration process. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, the present invention provides a particulate matter sensor calibration device and calibration method to solve the problems of the prior art requiring a large amount of adjustment time, affecting calibration efficiency and high operating costs.

[0007] This invention provides a particulate matter sensor calibration device, including a calibration chamber, a gas generating mechanism, an adjustment component, and a positioning mechanism. A reference sensor is disposed within the calibration chamber. The gas generating mechanism is connected to a pipeline within the calibration chamber and is used to deliver a preset volume of high-concentration particulate matter gas into the calibration chamber. The positioning mechanism is disposed within the calibration chamber and is used to install the sensor to be calibrated. The adjustment component is disposed within the calibration chamber and is used to dilute and guide the high-concentration particulate matter gas, so that the space occupied by the sensor to be calibrated is filled with particulate matter gas of a preset concentration. The positioning mechanism has mounting positions sequentially distributed along the direction of gravity, and all sensors to be calibrated are sequentially installed in their corresponding mounting positions. A gap is provided between the lowest mounting position and the bottom wall of the calibration chamber.

[0008] The particulate matter sensor calibration device provided by this invention has the following beneficial effects: By connecting the calibration chamber to the gas generating mechanism, and setting a reference sensor, a positioning mechanism, and an adjustment component corresponding to the sensor to be calibrated within the calibration chamber, when calibration of the sensor to be calibrated is required, the sensor to be calibrated is installed on the positioning mechanism, and a preset volume of high-concentration particulate matter gas is delivered into the calibration chamber at once through the gas generating mechanism. All particulate matter gas is first deposited on the bottom wall of the calibration chamber due to gravity. The adjustment component operates to pump a preset volume of particulate matter gas into the space where the sensor to be calibrated is located, so that the preset concentration of particulate matter gas is dynamically filled. The calibration system is located near the sensor to be calibrated. During calibration, based on the characteristic that gaseous particles will settle in the sealed calibration chamber, the adjustment component controls the pumping power and pumping cycle of the particulate gas, so that particulate gas of different volumes passes through the environment where the sensor to be calibrated is located along a preset path. The particulate concentration at the location of each sensor can be automatically and synchronously adjusted. The calibration control system records the detection values ​​of all sensors to be calibrated in different particulate gas concentration environments, and completes the calibration by comparing the particulate gas concentration value detected by the sensor to be calibrated with the standard particulate gas concentration value detected by the reference sensor and calculating the numerical deviation.

[0009] This calibration device, during a single particulate gas input calibration process, can conveniently and efficiently adjust the particulate gas concentration in the calibration environment of the particulate sensor by adjusting the parameters of the adjustment component. Compared with traditional particulate gas concentration adjustment devices that use synchronous input and output adjustment, which suffer from technical problems such as long adjustment time and low concentration stability, this device significantly reduces the gas delivery volume and shortens the adjustment time, effectively reducing production costs. At the same time, the operation of the adjustment component is simple. In the calibration process of mass production of particulate sensors, operators only need to input the parameters corresponding to the preset concentration to achieve efficient and automatic adjustment of particulate gas concentration, improving the execution efficiency of the calibration process, shortening production line start-up time, and increasing production efficiency.

[0010] Optionally, the positioning mechanism includes a positioning cabinet and a mounting plate. The positioning cabinet is provided with multiple sets of sliding grooves that are spaced apart sequentially along the direction of gravity. There are multiple sets of mounting plates, each set of which is slidably connected to a corresponding sliding groove. Each mounting plate is provided with multiple mounting positions for mounting a sensor to be calibrated. The reference sensor is located on one side of the top wall of the calibration chamber. A gap is provided between any two adjacent sets of mounting plates to accommodate the sensor to be calibrated. All sliding grooves extend horizontally.

[0011] By setting up a drawer-type cabinet and mounting plate structure, and distributing them in a hierarchical manner from high to low, particulate gas can move away from the sensor to be calibrated after moving along the direction of gravity. After being driven by the adjustment component, it can move closer to the sensor to be calibrated, ensuring that the gas circulates along a preset path and contacts the sensor to be calibrated. This allows for rapid and accurate calibration of multiple sensors, enabling batch calibration, improving calibration efficiency, and reducing costs.

[0012] Optionally, the positioning cabinet is provided with limiting seats, connecting plates, and support columns. Multiple sets of limiting seats are provided, each set slidingly adapted to its corresponding mounting plate via a sliding groove. The connecting plate is located inside the calibration chamber, and all the limiting seats are mounted on the connecting plate. The support column is fixedly connected to all the limiting seats. The support column and the connecting plate are vertically arranged along the direction of gravity. All the limiting seats are spaced apart on the connecting plate along the length of the support column. The sliding groove is formed on the limiting seat, and the connecting plate and the support column are distributed at both ends of the limiting seat.

[0013] By setting multiple sets of sliding grooves distributed at intervals along the direction of gravity on the positioning cabinet, the mounting plate is slidably connected to the sliding grooves, thereby realizing drawer-type calibration work, which facilitates the loading and unloading of two batches of sensors to be calibrated.

[0014] Optionally, the limiting seat includes two sets of limiting ribs, which are connected to both sides of the connecting plate. The ends of the two sets of limiting ribs opposite to each other are formed with the sliding groove. All the limiting ribs are evenly arranged in two rows along the direction of gravity. The connecting plate is connected to one end of all the limiting ribs, and the support column is connected to the other end of all the limiting ribs. There are two sets of support columns, and the two sets of support columns are respectively connected to all the limiting ribs in the corresponding rows for fixed connection. The two ends of the mounting plate can be slidably connected to the corresponding sliding groove.

[0015] Two sets of limiting ribs limit the mounting plate, ensuring that the mounting plate can slide stably with the slide groove. By pushing the mounting plate along the slide groove or dragging it down from the slide groove, a drawer-type disassembly and assembly can be achieved, allowing for quick installation, placement, or disassembly of the sensor. This reduces the difficulty of the process operation, improves calibration efficiency, and the frame structure not only has the advantages of stability and material saving, but also facilitates gas flow and improves the particulate matter gas concentration sedimentation efficiency.

[0016] Optionally, viewed from above along the direction of gravity, the overall structure of the limiting seat and the connecting plate is arranged in the shape of an inverted triangle; the end of the slide groove away from the connecting plate passes through the end sidewall of the limiting rib to form a slot structure for the mounting plate to enter the slide groove.

[0017] Viewed from above along the direction of gravity, the overall structure of the limiting seat and the connecting plate is arranged in the shape of a U, which enhances the overall structural strength and stability. The slot structure facilitates the drawer-style disassembly and assembly of the mounting plate.

[0018] Optionally, the mounting plate is provided with vents for the passage of particulate gas, and the number of vents is in multiple sets, with the multiple sets of vents evenly distributed between all the mounting positions.

[0019] Particulate gas that has dispersed and deposited on the mounting plate can move to the next layer through the pores, preventing it from accumulating on the original mounting plate, thus improving the efficiency of particulate gas concentration regulation and calibration accuracy.

[0020] Optionally, the adjustment assembly includes several sets of circulating fans, which are arranged on the horizontal side and / or above the positioning mechanism.

[0021] By setting several sets of circulating fans on the horizontal side and / or above the positioning mechanism, and symmetrically arranging the circulating fans on the horizontal side of the positioning mechanism, the positioning mechanism is positioned between the air inlets of several circulating fans. When the circulating fans are working, they draw particulate gas from the calibration chamber, causing the particulate gas to flow along a preset path, thereby achieving the effect of filling the space where the sensor to be calibrated is located as evenly as possible, thus improving the calibration accuracy.

[0022] Optionally, several sets of circulating fans are respectively installed on the inner wall of the calibration chamber, and a preset distance is provided between the air outlet of the circulating fan and the inner wall of the calibration chamber; wherein, the air outlet of several sets of circulating fans is arranged facing the inner wall of the calibration chamber, and the air inlet of several sets of circulating fans is arranged facing the positioning mechanism.

[0023] By orienting the air outlet of the circulating fan towards the inner wall of the calibration chamber, the particulate gas is diverted using the chamber wall. This allows the particulate gas to flow out through the gap between the circulating fan and the chamber wall, circulate within the chamber, and redeposit on the bottom wall, ensuring smooth circulation of the particulate gas along a stable path within the chamber. Specifically, the circulating fan has a rectangular cuboid structure, with support columns at its four corners. The ends of these support columns, furthest from the fan, are fixedly connected to the inner wall of the calibration chamber. Using support columns to mount the circulating fan on the inner wall of the chamber improves its installation stability and ensures structural stability during operation of the calibration device.

[0024] Optionally, the particulate sensor calibration device further includes an air purification mechanism, which is connected to the calibration chamber duct and is used to extract particulate gas inside the calibration chamber from the calibration chamber.

[0025] By connecting the air purification unit to the calibration chamber pipeline, and after the calibration process is completed, in order to prevent gas pollution of the environment and to recycle particulate gas, the high concentration of particulate gas at the bottom of the calibration chamber is uniformly extracted from the calibration chamber, thereby ensuring the stability of the calibration work.

[0026] The air purification mechanism serves two purposes: firstly, to purify the gas; and secondly, to accommodate more sensors to be calibrated. Specifically, as particulate matter settles to the bottom, the concentration gradually increases, potentially causing deviations in the calibration parameters of the bottom-ranked sensors. Therefore, support columns can be installed in the cabinet to ensure that the bottom-ranked sensors are not located at the very bottom of the calibration chamber, and that there is a gap between them and the bottom of the calibration chamber 3, preventing gas concentration rebound. Furthermore, the gas purification mechanism can extract gas at a preset rate, allowing particulate matter to settle to the bottom and leave the calibration chamber after the sensors have been calibrated (unlike traditional synchronous gas supply and extraction methods). This prevents a rebound in particulate matter concentration at the bottom of the calibration chamber, where the sensors can also be placed. During this process, the gas purifier slowly extracts gas at a certain rate after calibration begins, ensuring the stability of the calibration process and improving calibration accuracy.

[0027] This invention also provides a particulate matter sensor calibration method, comprising the following steps:

[0028] S100: The sensor to be calibrated is evenly installed on multiple sets of mounting positions located inside the calibration chamber and arranged along the direction of gravity.

[0029] S200: Controls the gas generating mechanism to deliver a preset volume of high-concentration particulate gas into the calibration chamber, where the high-concentration particulate gas is deposited at the bottom of the calibration chamber due to gravity.

[0030] S300: Start the circulating fan located on the inner wall of the calibration chamber and near the sensor to be calibrated. The fan will use the driving force generated by the fan at the preset power to pump the preset amount of particulate gas to the middle of the calibration chamber and fill the space where the sensor to be calibrated is located. After the particulate gas comes into contact with the sensor to be calibrated, it will flow back and settle to the bottom of the calibration chamber.

[0031] S400: The circulating fan operates continuously at a preset power and preset cycle until its pumping speed for particulate gas is the same as the settling speed of particulate gas. The reference sensor set on the side of the sensor to be calibrated feeds back the particulate gas concentration in the space where the sensor to be calibrated is located to the calibration control system.

[0032] S500: The calibration control system compares the particulate gas concentration value detected by the reference sensor with the particulate gas concentration value detected by the sensor to be calibrated, and performs corresponding calibration based on the comparison result;

[0033] S600: Input preset power parameters and preset cycle parameters into the circulating fan according to different particulate gas concentrations, repeat S400~S500, so that the sensor to be calibrated can complete the calibration process corresponding to different particulate gas concentration conditions.

[0034] S700: Control the air purification mechanism to extract particulate gas inside the calibration chamber from the calibration chamber.

[0035] The calibration method provided by this invention involves a particulate matter sensor calibration method. During calibration, a gas generating mechanism delivers a preset volume of high-concentration particulate matter gas into the calibration chamber. All particulate matter gas is initially deposited on the bottom wall of the calibration chamber due to gravity. An adjusting component then pumps a preset volume of particulate matter gas into the space where the sensor to be calibrated is located, dynamically filling the vicinity of the sensor with a preset concentration of particulate matter gas. During calibration, based on the characteristic that gaseous particles settle within the sealed calibration chamber, the adjusting component controls the pumping power and pumping cycle of the particulate matter gas, allowing different volumes of particulate matter gas to repeatedly pass through the environment of the sensor to be calibrated along a preset path. The particulate matter concentration at each sensor location can be automatically and synchronously adjusted. The calibration control system records the detection values ​​of all sensors under different particulate matter gas concentration environments and completes the calibration by comparing the particulate matter gas concentration values ​​detected by the sensor to be calibrated with the standard particulate matter gas concentration values ​​detected by a reference sensor and calculating the numerical deviation.

[0036] This calibration device, during a single particulate gas input calibration process, can conveniently and efficiently adjust the particulate gas concentration in the calibration environment of the particulate sensor by adjusting the parameters of the adjustment component. Compared with traditional particulate gas concentration adjustment devices that use synchronous input and output adjustment, which suffer from technical problems such as long adjustment time and low concentration stability, this device significantly reduces the gas delivery volume and shortens the adjustment time, effectively reducing production costs. At the same time, the operation of the adjustment component is simple. In the calibration process of mass production of particulate sensors, operators only need to input the parameters corresponding to the preset concentration to achieve efficient and automatic adjustment of particulate gas concentration, improving the execution efficiency of the calibration process, shortening production line start-up time, and increasing production efficiency. Attached Figure Description

[0037] 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 of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the particulate matter sensor calibration device provided in an embodiment of the present invention;

[0039] Figure 2 This is a front view of a particle sensor calibration device provided in another embodiment of the present invention;

[0040] Figure 3 for Figure 2 A schematic diagram of the internal structure of the calibration chamber;

[0041] Figure 4 for Figure 1 A schematic diagram of the positioning mechanism in the diagram;

[0042] Figure 5 for Figure 4 A front view schematic diagram of the positioning mechanism in the diagram;

[0043] Figure 6 for Figure 4 A structural diagram of the positioning cabinet in the diagram;

[0044] Figure 7 This is a schematic flowchart of a particulate sensor calibration method provided in another embodiment of the present invention.

[0045] Figure descriptions: 1. Gas generating mechanism, 2. Air purification mechanism, 3. Calibration chamber, 31. Positioning cabinet, 311. Limiting rib, 311-1. Slide groove, 311-2. Support column, 312. Mounting plate, 313. Connecting plate, 32. Circulating fan, 33. Sensor to be calibrated. Detailed Implementation

[0046] 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 a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0047] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0048] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0049] Please see Figure 1-7One embodiment of the present invention provides a particulate sensor calibration device, including a calibration chamber 3, a gas generating mechanism 1, an adjustment component, and a positioning mechanism. A reference sensor is disposed within the calibration chamber 3. The gas generating mechanism 1 is pipe-connected to the calibration chamber 1 and is used to deliver a preset volume of high-concentration particulate gas into the calibration chamber 3. The positioning mechanism is disposed within the calibration chamber and is used to install a sensor 33 to be calibrated. The adjustment component is disposed within the calibration chamber 3 and is used to dilute and guide the high-concentration particulate gas, so that the space occupied by the sensor 33 to be calibrated is filled with a preset concentration of particulate gas. The positioning mechanism has mounting positions distributed sequentially along the direction of gravity. All sensors to be calibrated are sequentially installed at their corresponding mounting positions. A gap is provided between the lowest mounting position and the bottom wall of the calibration chamber 3. This gap structure ensures that after particulate gas deposition, there is a certain distance between the deposited particulate gas and the sensor to be calibrated at the lowest mounting position, preventing the deposited particulate gas from affecting the calibration results of the sensor at the lowest mounting position.

[0050] In this embodiment, the calibration chamber 3 is connected to the gas generating mechanism 1, and a reference sensor, a positioning mechanism, and an adjustment component corresponding to the sensor 33 to be calibrated are provided inside the calibration chamber 3. When the sensor 33 to be calibrated needs to be calibrated, the sensor 33 to be calibrated is installed on the positioning mechanism, and a preset volume of high-concentration particulate gas is delivered into the calibration chamber 3 at once through the gas generating mechanism 1. All the particulate gas is first deposited on the bottom wall of the calibration chamber 3 due to gravity. The adjustment component operates to pump the preset volume of particulate gas into the space where the sensor 33 to be calibrated is located, so that the preset concentration of particulate gas dynamically fills the space to be calibrated. Near sensor 33, during calibration, based on the characteristic that gaseous particles will settle in the sealed calibration chamber, the adjustment component controls the pumping power and pumping cycle of the particulate gas, so that particulate gas of different volumes passes through the environment where the sensor to be calibrated 33 is located along a preset path. The particulate concentration at the location of each layer of sensors can be automatically and synchronously adjusted. The calibration control system records the detection values ​​of all sensors to be calibrated in different particulate gas concentration environments, and completes the calibration by comparing the particulate gas concentration value detected by the sensor to be calibrated 33 with the standard particulate gas concentration value detected by the reference sensor and calculating the numerical deviation.

[0051] This calibration device, during a single particulate gas input calibration process, can conveniently and efficiently adjust the particulate gas concentration in the calibration environment of the particulate sensor by adjusting the parameters of the adjustment component. Compared with traditional particulate gas concentration adjustment devices that use synchronous input and output adjustment, which suffer from technical problems such as long adjustment time and low concentration stability, this device significantly reduces the gas delivery volume and shortens the adjustment time, effectively reducing production costs. At the same time, the operation of the adjustment component is simple. In the calibration process of mass production of particulate sensors, operators only need to input the parameters corresponding to the preset concentration to achieve efficient and automatic adjustment of particulate gas concentration, improving the execution efficiency of the calibration process, shortening production line start-up time, and increasing production efficiency.

[0052] In one embodiment, the positioning mechanism includes a positioning cabinet 31 and a mounting plate 312. The positioning cabinet 31 is provided with multiple sets of sliding grooves 311-1 distributed sequentially and at intervals along the direction of gravity. There are multiple sets of mounting plates 312, each set of which is slidably connected to a corresponding sliding groove 311-1. Each mounting plate 312 is provided with multiple mounting positions for mounting a sensor 33 to be calibrated. The reference sensor is located on one side of the top wall of the calibration chamber 3. For example, in this embodiment, the reference sensor is located at the top of the positioning cabinet 31. In other embodiments, the reference sensor can be located on the topmost mounting plate 312. A gap is provided between any two adjacent sets of mounting plates 312 to accommodate the sensor 33 to be calibrated. All sliding grooves 311-1 extend horizontally.

[0053] In this embodiment, by setting up a drawer-type cabinet and mounting plate 312 structure, and distributing them in a hierarchical manner from high to low, the particulate gas can move away from the sensor to be calibrated 33 after moving along the direction of gravity, and then approach the sensor to be calibrated 33 after being driven by the adjustment component. This ensures that the gas moves in a cycle along a preset path and contacts the sensor to be calibrated 33, so as to quickly and accurately calibrate multiple sensors to be calibrated 33, realize batch calibration, improve calibration efficiency, and reduce costs.

[0054] In one embodiment, the positioning cabinet 31 is provided with limiting seats, connecting plates 313, and support columns 311-2. Multiple sets of limiting seats are provided, each set slidingly adapted to its corresponding mounting plate 312 via a sliding groove 311-1. The connecting plate 313 is disposed within the calibration chamber 3, and all limiting seats are disposed on the connecting plate 313. The support columns 311-2 are fixedly connected to all limiting seats. The support columns 311-2 and the connecting plate 313 are vertically arranged along the direction of gravity. All limiting seats are spaced along the length of the support columns 311-2 and formed on the connecting plate 313. The sliding grooves 311-1 are formed on the limiting seats, and the connecting plate 313 and the support columns 311-2 are distributed at both ends of the limiting seats.

[0055] In this embodiment, by setting multiple sets of sliding grooves 311-1 distributed sequentially at intervals along the direction of gravity on the positioning cabinet 31, the mounting plate 312 is slidably connected to the sliding grooves 311-1, thereby realizing the drawer-type calibration work, so as to facilitate the loading and unloading of two batches of sensors to be calibrated.

[0056] In one embodiment, the limiting seat includes two sets of limiting ribs 311, which are connected to both sides of the connecting plate 313. The ends of the two sets of limiting ribs 311 that are opposite to each other are formed with the sliding groove 311-1. All the limiting ribs 311 are evenly arranged in two rows along the direction of gravity. The connecting plate 313 is connected to one end of all the limiting ribs 311, and the support column 311-2 is connected to the other end of all the limiting ribs 311. There are two sets of support columns 311-2, which are respectively connected to all the limiting ribs 311 in the corresponding rows and fixedly connected. The two ends of the mounting plate 312 can be slidably connected to the corresponding sliding groove 311-1.

[0057] In this embodiment, the mounting plate 312 is limited by two sets of limiting ribs 311 to ensure that the mounting plate 312 can slide stably with the slide groove 311-1. By pushing the mounting plate 312 along the slide groove 311-1 or dragging it down from the slide groove 311-1, a drawer-type disassembly and assembly can be achieved, so as to quickly install, place or disassemble the sensor, reduce the difficulty of the process operation, improve the calibration efficiency, and the frame structure not only has the advantages of stability and material saving, but also facilitates gas flow and improves the particulate matter gas concentration sedimentation efficiency.

[0058] In one embodiment, viewed from above along the direction of gravity, the overall structure of the limiting seat and the connecting plate 313 is arranged in the shape of a U; the end of the slide groove 311-1 away from the connecting plate 313 passes through the end sidewall of the limiting rib 311 to form a slot structure for the mounting plate 312 to enter the slide groove 311-1.

[0059] In this embodiment, the overall structure of the limiting seat and the connecting plate 313 is arranged in a U-shape by viewing it from above along the direction of gravity, which further enhances the overall structural strength and stability. The slot structure is provided to facilitate the drawer-type disassembly and assembly of the mounting plate 312.

[0060] In one embodiment, the mounting plate 312 is provided with vents for the passage of particulate gas, and the number of vents is multiple sets, which are evenly distributed among all the mounting positions.

[0061] In this embodiment, particulate gas that has drifted and deposited on the mounting plate 312 can move to the next layer through the pores, preventing it from accumulating on the original mounting plate 312, thereby improving the efficiency of particulate gas concentration regulation and improving calibration accuracy.

[0062] In one embodiment, a plurality of mounting positions are arranged in an array along the X-axis and Y-axis directions on the top surface of the mounting plate 312, respectively.

[0063] In this embodiment, by arranging multiple mounting positions in an array along the X-axis and Y-axis directions on the top surface of the mounting plate 312, the layout is simplified, and multiple sensors 33 to be calibrated are quickly installed, thus standardizing the installation and calibration standards.

[0064] In one embodiment, the adjustment component includes a plurality of circulating fans 32, which are arranged on the horizontal side and / or above the positioning mechanism.

[0065] In this embodiment, several sets of circulating fans 32 are arranged on the horizontal side and / or above the positioning mechanism, so that the positioning mechanism is positioned between the air inlets of the circulating fans 32. When the circulating fans 32 are working, they draw in particulate gas from the calibration chamber 3, causing the particulate gas to flow along a preset path. This achieves the effect of filling the space where the sensor to be calibrated is located as evenly as possible, thereby improving calibration accuracy. This allows part of the particulate gas to deposit in the calibration chamber as a gas source, while another part of the particulate gas is driven by the circulating fans 32 to move towards the sensor 33 to be calibrated.

[0066] The position and number of circulating fans 32 can be set according to the working requirements so that the circulating fans 32 can draw gas towards the sensor 33 to be calibrated, and make the gas circulate along a preset path. For example, several sets of circulating fans 32 are set on both sides and above the positioning mechanism, and the circulating fans 32 on both sides of the positioning mechanism are symmetrically arranged. The positioning mechanism is set between the air inlets of all the circulating fans 32.

[0067] In one embodiment, several sets of circulating fans 32 are respectively installed on the inner wall of the calibration chamber 3, and a preset distance is provided between the air outlet of the circulating fan 32 and the inner wall of the calibration chamber 3; wherein, the air outlet of several sets of circulating fans 32 is arranged facing the inner wall of the calibration chamber 3, and the air inlet of several sets of circulating fans 32 is arranged facing the positioning mechanism.

[0068] In this embodiment, by oriented the air outlet of the circulating fan 32 toward the inner wall of the calibration chamber 3, the particulate gas is diverted by the wall of the calibration chamber 3. The particulate gas flows out through the gap between the circulating fan 32 and the wall of the calibration chamber 3, flows along the inner wall of the calibration chamber 3, and is redeposited onto the bottom wall of the calibration chamber 3, ensuring that the particulate gas can circulate smoothly within the calibration chamber 3 along a stable path. Specifically, the circulating fan 32 has a rectangular cuboid structure, and support columns are provided at the four corners of the circulating fan. The ends of the support columns away from the circulating fan are fixedly connected to the inner wall of the calibration chamber 3. Using support columns to install the circulating fan 32 on the inner wall of the calibration chamber 3 improves the installation stability of the circulating fan 32 and ensures the structural stability of the calibration device during operation.

[0069] In this embodiment, there are multiple sets of reference sensors, which are evenly distributed along the edge of the positioning cabinet 31. Using multiple sets of reference sensors along the edge helps the operator determine the particulate gas concentration value of the entire positioning cabinet 31 based on the detection values ​​of the reference sensors.

[0070] In this embodiment, the circulating fan located on the horizontal side of the positioning mechanism generates a horizontal driving force on the particulate gas, while the circulating fan located above the positioning mechanism generates an upward driving force on the particulate gas in the direction opposite to gravity. The driving forces generated by all the fans in each direction form a wind zone for driving the particulate gas to move along a preset path. Since the particulate gas will settle downwards due to gravity when the circulating fan stops operating, when the operator adjusts the power of the circulating fan located above the positioning mechanism, the vertical influence range of the wind zone can be adjusted, controlling the settling efficiency of the particulate gas. This changes the volume of particulate gas in contact with the sensor to be calibrated and the reference sensor per unit time, thereby achieving particulate gas concentration regulation. It is worth noting that in this embodiment, the horizontal wind zone generated by the horizontally arranged circulating fan 32 can cover the entire positioning cabinet 31 to prevent deviations in the particulate concentration at different levels of the positioning cabinet 31, which would affect the accuracy of unified calibration.

[0071] In one embodiment, an air purification mechanism 2 is also included, which is connected to the calibration chamber 3 via a pipe. The air purification mechanism 2 is used to extract particulate gas inside the calibration chamber 3 from the calibration chamber 3.

[0072] In this embodiment, by connecting the air purification mechanism 2 to the calibration chamber 3 via a pipe, and after the calibration process is completed, in order to prevent gas pollution of the environment and to recycle particulate gas, the high concentration of particulate gas at the bottom of the calibration chamber 3 is uniformly extracted from the calibration chamber 3, thereby ensuring the stability of the calibration work.

[0073] The air purification mechanism 2 serves two purposes: firstly, to purify the gas; and secondly, to accommodate more sensors 33 to be calibrated. Specifically, as particulate matter settles to the lowest point, the particulate matter concentration in the bottom space gradually increases, causing deviations in the calibration parameters of the bottommost sensor 33. Therefore, support columns 311-2 can be installed in the cabinet to ensure that the environment of the bottommost sensor 33 is not at the very bottom of the calibration chamber 3, and that there is a gap between it and the bottom of the calibration chamber 3, preventing gas concentration rebound. Furthermore, the gas purification mechanism can extract gas at a preset rate, allowing particulate matter to leave the calibration chamber 3 after settling to the bottom and after the sensors 33 have completed calibration (unlike traditional synchronous gas supply and extraction methods), thus preventing a rebound in the particulate matter concentration at the bottom of the calibration chamber 3. The bottommost position can also be used to place the sensors 33 to be calibrated. During this process, the gas purifier slowly extracts gas at a certain rate after calibration begins to ensure the stability of the calibration work and improve calibration accuracy.

[0074] like Figure 7As shown, another embodiment of the present invention also provides a particulate sensor calibration method, using the particulate sensor calibration device described above, including the following steps:

[0075] S100. The sensor 33 to be calibrated is evenly installed on multiple sets of mounting positions located inside the calibration chamber 3 and arranged along the direction of gravity.

[0076] Specifically, the gas generating mechanism 1 is connected to the calibration chamber 3 by a pipeline. The calibration chamber 3 is equipped with a reference sensor, an adjustment component, and a positioning mechanism. The positioning mechanism is used to install the sensor 33 to be calibrated. The positioning mechanism is provided with mounting positions distributed sequentially along the direction of gravity. All the sensors 33 to be calibrated are installed sequentially in the corresponding mounting positions.

[0077] S200, the control gas generating mechanism 1 delivers a preset volume of high-concentration particulate gas to the calibration chamber 3, and the high-concentration particulate gas is deposited at the bottom of the calibration chamber 3 due to gravity.

[0078] S300: Start the circulating fan 32, which is located on the inner wall of the calibration chamber 3 and near the sensor 33 to be calibrated, so that the fan 32 generates a preset amount of particulate gas with a preset power and drives it to the middle position of the calibration chamber 3 and fills the space where the sensor 33 to be calibrated is located. After the particulate gas comes into contact with the sensor 33 to be calibrated, it flows back and settles to the bottom of the calibration chamber 3.

[0079] S400: The circulating fan 32 operates continuously at a preset power and preset cycle until its pumping speed of particulate gas is the same as the settling speed of particulate gas. The reference sensor set on one side of the sensor to be calibrated 33 feeds back the particulate gas concentration in the space where the sensor to be calibrated 33 is located to the calibration control system.

[0080] S500: The calibration control system compares the particulate gas concentration value detected by the reference sensor with the particulate gas concentration value detected by the sensor 33 to be calibrated, and performs corresponding calibration based on the comparison result.

[0081] The gas concentration near the sensors to be calibrated at different heights shows the same trend. By combining the particulate matter concentration data detected at different heights and performing unified calculations based on the detection results of each sensor to be calibrated 33 and the corresponding reference sensor, the calibration parameters of each sensor to be calibrated 33 are obtained. Finally, the calibration parameters of each sensor to be calibrated 33 are written into each sensor to be calibrated 33, thereby completing the calibration of several sensors to be calibrated 33.

[0082] S600: Input preset power parameters and preset cycle parameters into the circulating fan according to different particulate gas concentrations, repeat S400~S500, so that the sensor to be calibrated can complete the calibration process corresponding to different particulate gas concentration conditions.

[0083] S700: Control the air purification mechanism to extract particulate gas inside the calibration chamber from the calibration chamber.

[0084] Workflow: A pre-set volume of high-concentration particulate gas is delivered into the calibration chamber via a gas generating mechanism. An adjusting component then pumps a pre-set volume of particulate gas to the space where the sensor 33 to be calibrated is located, dynamically filling the vicinity of the sensor 33 with a pre-set concentration of particulate gas. During calibration, based on the characteristic that gaseous particles settle within the sealed calibration chamber 3, the adjusting component controls the pumping power and pumping cycle of the particulate gas, causing different volumes of particulate gas to repeatedly pass through the environment of the sensor 33 along a pre-set path. This allows for automated synchronous adjustment of the particulate concentration at each sensor location. The calibration control system records the detection values ​​of all sensors 33 under different particulate gas concentration environments and compares the particulate gas concentration values ​​detected by the sensor 33 with those of a reference sensor. The calibration device compares the measured standard particulate gas concentration value with the standard value and calculates the numerical deviation to complete the calibration. This allows for convenient and efficient adjustment of the particulate gas concentration at the calibration point of the particulate sensor during a single particulate gas input calibration process. This enables spatial optimization of the particulate sensor calibration device, while simplifying operation for production personnel. In the calibration process for mass production of particulate sensors, this device achieves efficient and automatic adjustment of particulate gas concentration. Compared to the traditional method of adjusting gas concentration by simultaneously supplying and receiving gas, this calibration device effectively reduces adjustment time, improves the efficiency of the calibration process, and lowers redundant costs in sensor production operations. The entire calibration process is fully automated, and the operation is very simple for workers. By positioning several sensors 33 to be calibrated using the positioning cabinet 31, batch calibration of the sensor matrix is ​​achieved, facilitating mass production.

[0085] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A particulate matter sensor calibration device, characterized in that, include: A calibration chamber, wherein a reference sensor is installed; A gas generating mechanism is connected to the calibration chamber pipeline and is used to deliver a preset volume of high-concentration particulate gas into the calibration chamber. A positioning mechanism is disposed within the calibration chamber and is used to install the sensor to be calibrated. An adjustment component is disposed within the calibration chamber and is used to dilute and guide high-concentration particulate gas, so that a preset concentration of particulate gas fills the space where the sensor to be calibrated is located. The positioning mechanism is provided with mounting positions distributed sequentially along the direction of gravity. All sensors to be calibrated are installed sequentially in their corresponding mounting positions. There is a gap between the mounting position at the lowest layer and the bottom wall of the calibration chamber. The adjustment assembly includes several sets of circulating fans, which are arranged on the horizontal side and / or above the positioning mechanism. Several sets of circulating fans are respectively installed on the inner wall of the calibration chamber, and a preset distance is provided between the air outlet of the circulating fan and the inner wall of the calibration chamber; wherein, the air outlet of several sets of circulating fans is arranged facing the inner wall of the calibration chamber, and the air inlet of several sets of circulating fans is arranged facing the positioning mechanism. It also includes an air purification mechanism, which is connected to the calibration chamber duct and is used to extract particulate gas inside the calibration chamber from the calibration chamber.

2. The particulate matter sensor calibration device as described in claim 1, characterized in that, The positioning mechanism includes: A positioning cabinet, wherein the positioning cabinet is provided with multiple sets of sliding grooves that are spaced apart sequentially along the direction of gravity; The mounting plate is provided in multiple sets, and each set of mounting plates is slidably connected to a corresponding slide groove. The mounting plate is provided with multiple mounting positions for mounting the sensor to be calibrated. In this configuration, a gap is provided between any two adjacent sets of mounting plates to accommodate the sensor to be calibrated, and all the slides extend horizontally.

3. The particulate matter sensor calibration device as described in claim 2, characterized in that, The positioning cabinet includes: The limiting seat is provided in multiple sets, and each set of the limiting seat slides and is adapted to the corresponding mounting plate through the sliding groove. A connecting plate is disposed inside the calibration chamber, and all the limiting seats are disposed on the connecting plate; Support column, which is fixedly connected to all limiting seats; The support column and the connecting plate are vertically arranged along the direction of gravity. All the limiting seats are formed at intervals on the connecting plate along the length direction of the support column. The sliding groove is formed on the limiting seat. The connecting plate and the support column are distributed at both ends of the limiting seat.

4. The particulate matter sensor calibration device as described in claim 3, characterized in that, The limiting seat includes two sets of limiting ribs, which are connected to both sides of the connecting plate. The ends of the two sets of limiting ribs opposite each other are formed with the sliding groove. All the limiting ribs are evenly arranged in two rows along the direction of gravity. The connecting plate is connected to one end of all the limiting ribs, and the support column is connected to the other end of all the limiting ribs. There are two sets of support columns, and the two sets of support columns are respectively connected to all the limiting ribs in the corresponding rows for fixed connection. The two ends of the mounting plate can be slidably connected to the corresponding sliding groove.

5. The particulate matter sensor calibration device as described in claim 4, characterized in that, Viewed from above along the direction of gravity, the overall structure of the limiting seat and the connecting plate is arranged in the shape of a U; the end of the slide away from the connecting plate passes through the end sidewall of the limiting rib to form a slot structure for the mounting plate to enter the slide.

6. The particulate matter sensor calibration device as described in claim 2, characterized in that, The mounting plate is provided with vents for the passage of particulate gas. There are multiple sets of vents, and the multiple sets of vents are evenly distributed between all the mounting positions.

7. A particulate matter sensor calibration method, performed by the particulate matter sensor calibration device according to any one of claims 1-6, characterized in that, Includes the following steps: S100: The sensor to be calibrated is evenly installed on multiple sets of mounting positions located inside the calibration chamber and arranged along the direction of gravity. S200: Controls the gas generating mechanism to deliver a preset volume of high-concentration particulate gas into the calibration chamber, where the high-concentration particulate gas is deposited at the bottom of the calibration chamber due to gravity. S300: Start the circulating fan located on the inner wall of the calibration chamber and near the sensor to be calibrated. The fan will use the driving force generated by the fan at the preset power to pump the preset amount of particulate gas to the middle of the calibration chamber and fill the space where the sensor to be calibrated is located. After the particulate gas comes into contact with the sensor to be calibrated, it will flow back and settle to the bottom of the calibration chamber. S400: The circulating fan operates continuously at a preset power and preset cycle until its pumping speed for particulate gas is the same as the settling speed of particulate gas. The reference sensor set on the side of the sensor to be calibrated feeds back the particulate gas concentration in the space where the sensor to be calibrated is located to the calibration control system. S500: The calibration control system compares the particulate gas concentration value detected by the reference sensor with the particulate gas concentration value detected by the sensor to be calibrated, and performs corresponding calibration based on the comparison result; S600: Input preset power parameters and preset cycle parameters to the circulating fan according to different particulate gas concentrations, repeat S400~S500, so that the sensor to be calibrated can complete the calibration process corresponding to different particulate gas concentration conditions. S700: Control the air purification mechanism to extract particulate gas inside the calibration chamber from the calibration chamber.

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