Particulate matter sensor calibration device and particulate matter sensor calibration system

Abstract

The utility model provides a particulate matter sensor calibration device and a particulate matter sensor calibration system, the device comprises a positioning cabinet and a plurality of mounting plates, and the positioning cabinet is sequentially provided with a plurality of groups of transverse limiting units along the gravity direction; wherein each group of transverse limiting units comprises two adjacent transverse limiting columns which are positioned at the same horizontal height; and the mounting plates are distributed at intervals in the gravity direction and are in sliding connection with the two transverse limiting columns of the corresponding transverse limiting units correspondingly, and the mounting plates can horizontally slide in the length direction of the transverse limiting columns. During calibration, based on the characteristic that the concentration of an abrupt object slowly settles in the closed calibration cabin, the gas at the position of each layer of sensor can be settled from high concentration to low concentration, and the sensor at the corresponding position detects the gas concentration in the process; therefore, the to-be-calibrated sensor and the reference sensor on the positioning cabinet are ensured to dynamically detect the concentration of the particulate gas in the calibration cabin, and the calibration is more accurate.

Description

Technical Field

[0001] The utility model belongs to the technical field of calibration, and in particular relates to a particle sensor calibration device and a particle sensor calibration system. Background Art

[0002] All sensors need to be calibrated and calibrated before leaving the factory. In addition, in the actual measurement process of the sensor, after working for a period of time, the sensor is generally calibrated and calibrated regularly.

[0003] The calibration of gas sensors requires the use of professional instruments and equipment to measure the gas sensors to check whether the factory settings of the gas sensors are within the error range specified by the state.

[0004] The calibration of a gas sensor refers to placing the instrument in a test gas of known concentration and comparing the gas sensor detection results with the gas concentration to determine the accuracy of the gas sensor.

[0005] In the existing particle sensor calibration and calibration work, the particle sensor to be tested is usually simply placed in the detection chamber for calibration and calibration. For example, an existing workbench is placed in the detection chamber. When the particle sensor to be tested needs to be calibrated and calibrated, the particle sensor to be tested is placed on the workbench in the detection chamber, and the particle gas concentration in the detection chamber is adjusted to a preset value by continuously inputting and outputting the particle gas before the particle sensor is calibrated. However, in this way, it is impossible to perform the corresponding calibration work according to the characteristics of the particles. It takes a lot of time to adjust the particle gas concentration to complete the calibration process, resulting in low efficiency of the calibration process. In addition, the dynamic pumping adjustment method will cause a sharp increase in the particle gas concentration in the detection chamber near the particle gas transport pipeline, resulting in a deviation in the gas concentration of the calibration environment and low calibration accuracy. Utility Model Content

[0006] In order to overcome the deficiencies of the prior art, the utility model provides a particle sensor calibration device and a particle sensor calibration system to solve the problem of low calibration efficiency and low calibration accuracy of the particle sensor calibration device in the prior art due to the use of a dynamic pumping gas concentration adjustment method.

[0007] One embodiment of the utility model provides a particle sensor calibration device, including a positioning cabinet and a plurality of mounting plates, wherein the positioning cabinet is provided with a plurality of groups of transverse limit units in sequence along the gravity direction; wherein each group of transverse limit units includes two transverse limit columns that are at the same horizontal height and adjacent to each other; wherein the mounting plates are spaced apart along the gravity direction and are respectively slidably connected with the two transverse limit columns corresponding to the transverse limit units, and wherein the mounting plates can slide horizontally along the length direction of the transverse limit columns; wherein the mounting plates are used to mount a plurality of sensors to be calibrated and at least one reference sensor.

[0008] By arranging a plurality of groups of lateral limit units in sequence along the direction of gravity on the positioning cabinet, and by slidingly connecting a plurality of mounting plates with the lateral limit columns of the plurality of groups of the lateral limit units in the direction of gravity, by mounting the sensor to be calibrated and at least one reference sensor on the mounting plate, and by stacking a plurality of mounting plates in sequence along the direction of gravity, during calibration, based on the characteristic of slow sedimentation of particulate matter concentration in a closed calibration chamber, the gas at the position of each layer of sensors can all be sedimented from "high to low concentration", and the sensors at the corresponding positions detect the gas concentration in this process; thereby ensuring that the sensor to be calibrated and the reference sensor on the positioning cabinet dynamically detect the particulate gas concentration in the calibration chamber, and subsequently comparing the gas particulate concentration detected by the sensor to be calibrated with the reference data detected by the standard sensor and recording the data deviation, thereby completing the calibration; thereby realizing dynamic acquisition of the gas concentration of the PM2.5 sensor calibration point, and fully automating the PM2.5 sensor calibration process, making the PM2.5 sensor calibration more accurate, and at the same time, simple operation for production personnel, and easy realization of large-scale mass production of PM2.5 sensors, thereby reducing adjustment time, improving calibration efficiency and reducing operating costs.

[0009] Among them, by arranging several groups of transverse limit units at intervals along the gravity direction on the positioning cabinet, the mounting plate is limited and installed by two adjacent transverse limit columns at the same horizontal height, and several mounting positions for installing sensors to be calibrated are arranged on the mounting plate, thereby realizing calibration of several sensors to be calibrated, realizing batch calibration, improving calibration efficiency and reducing costs.

[0010] Optionally, the positioning cabinet is provided with a limit plate, and the limit plate is arranged at one end of the transverse limit column.

[0011] By arranging a limit plate on the positioning cabinet, and the limit plate is arranged at one end of the transverse limit column, the mounting plate is prevented from sliding out from the other end of the transverse limit column when sliding with the transverse limit column, thereby improving the stability of the calibration work. At the same time, the support force of the transverse limit column is increased by the limit plate, thereby realizing the spaced arrangement of the transverse limit column along the gravity direction.

[0012] Optionally, sliding grooves are arranged on the opposite surfaces of the two transverse limit columns of each group of transverse limit units, and there is a preset distance between the end of the sliding groove close to the limit plate and the limit plate, and the other end of the sliding groove is extended along the length direction of the limit plate and passes through the end of the transverse limit column away from the limit plate, and the two sides of the mounting plate are respectively slidably connected to the sliding grooves on the opposite surfaces of two adjacent transverse limit columns at the same horizontal height.

[0013] By arranging a slide groove on the opposite surfaces of two adjacent transverse limit columns at the same horizontal height, the mounting plate is slidably connected to the transverse limit column through the slide groove on the opposite surfaces of two adjacent transverse limit columns at the same horizontal height, and since there is a preset distance between one end of the slide groove close to the limit plate and the limit plate, the other end of the slide groove is extended along the length direction of the limit plate and passes through the end of the transverse limit column away from the limit plate, and by pushing the mounting plate along the direction of the slide groove or dragging it down from the slide groove, the sensor can be quickly installed, placed or disassembled, the difficulty of process operation is reduced, and the calibration efficiency is improved.

[0014] Optionally, a support column is further arranged between two adjacent transverse limiting columns arranged along the gravity direction, the support column is arranged away from the limiting plate, and the support column is arranged close to the other end of the transverse limiting column.

[0015] By arranging a support column between two adjacent transverse limit columns on the same vertical line to support the transverse limit column, and the support column is arranged close to the other end of the transverse limit column, the supporting effect on the transverse limit column is further enhanced.

[0016] Optionally, a plurality of mounting positions are arranged on the top surface of any of the mounting plates, and all of the mounting positions on any of the mounting plates are respectively used to mount a plurality of the sensors to be calibrated and at least one reference sensor.

[0017] By arranging a plurality of mounting positions on the top surface of the mounting plate, a plurality of sensors to be calibrated and at least one reference sensor can be quickly mounted, the installation standard and the calibration standard can be standardized, and the work output and efficiency can be improved.

[0018] Optionally, the positioning cabinet is further provided with a plurality of groups of transverse limiting units in sequence along the horizontal direction.

[0019] By arranging a plurality of transverse limit columns at intervals along the vertical direction and the horizontal direction on the positioning cabinet, the mounting plate is limitedly installed by two adjacent transverse limit columns at the same horizontal height, and the top surface of the mounting plate is arranged upward, and a plurality of mounting positions for installing sensors to be calibrated are arranged on the mounting plate, thereby calibrating a plurality of sensors to be calibrated, realizing batch calibration, improving calibration efficiency and reducing costs.

[0020] The utility model also provides a particle sensor calibration system, comprising a calibration cabin and a particle sensor calibration device as described in any one of the above items, wherein the particle sensor calibration device is arranged in the calibration cabin.

[0021] Since the beneficial effects and advantages of the particle sensor calibration device have been described in the above content, they will not be repeated here. The particle sensor calibration system includes the particle sensor calibration device, and the particle sensor calibration system also has the same beneficial effects and advantages. At the same time, by arranging the particle sensor calibration device in the calibration cabin, a good calibration and calibration environment is provided for the sensor to be calibrated, thereby improving the calibration and calibration accuracy of the sensor to be calibrated on the particle sensor calibration device.

[0022] Optionally, it also includes a gas generating mechanism and a regulating device, wherein the gas generating mechanism is connected to the calibration cabin pipeline and is used to transport a preset volume of high-concentration particulate matter gas into the calibration cabin; the regulating device is arranged in the calibration cabin and is used to dilute and guide the high-concentration particulate matter gas in the calibration cabin so that the particulate matter gas with a preset concentration fills the space where the sensor to be calibrated is located.

[0023] By connecting the calibration cabin with the gas generating mechanism and arranging an adjusting device in the calibration cabin, when it is necessary to calibrate the sensor to be calibrated, a preset volume of high-concentration particulate gas is delivered to the calibration cabin at one time through the gas generating mechanism, and a circulating fan is used to generate a driving force with a preset power to draw the preset volume of particulate gas to the middle position of the calibration cabin and fill the space where the sensor to be calibrated is located. After the particulate gas contacts the sensor to be calibrated, it flows back and settles to the bottom of the calibration cabin. Based on the characteristic of slow sedimentation of particulate concentration in a closed calibration cabin, the gas at the location of each layer of sensors can settle from high to low concentration, and the sensors at the corresponding positions detect the gas concentration in this process.

[0024] Among them, the air purification mechanism is used to purify the gas on the one hand; on the other hand, it is to accommodate more sensors to be calibrated. Specifically: when the particles settle at the bottom, the particle concentration in the bottom space gradually increases, and the calibration parameters of the sensors to be calibrated at the bottom will have deviations; therefore, a support column can be set in the cabinet so that the environment of the sensors to be calibrated at the bottom is not the bottom of the calibration cabin, and there is a gap between the bottom of the calibration cabin 3 to avoid the gas concentration from rebounding; further, the gas purification mechanism can be set to extract the gas at a preset rate, so that the particles leave the calibration cabin after settling to the bottom and completing the calibration of the sensors to be calibrated (different from the traditional synchronous gas transmission and extraction method), thereby preventing the gas particle concentration at the bottom of the calibration cabin from rebounding, and the sensors to be calibrated can also be set at the bottom. In this process, the gas purifier is to extract air at a certain rate after the calibration starts to ensure the stability of the calibration work and improve the calibration accuracy.

[0025] Through the gas generating mechanism and the adjusting device, a stable calibration environment is provided for the sensor to be tested, and the gas concentration of the PM2.5 sensor calibration point can be dynamically acquired. The fully automatic PM2.5 sensor calibration process makes the PM2.5 sensor calibration more accurate. At the same time, it is simple for production personnel to operate and easy to realize large-scale mass production of PM2.5 sensors, thereby reducing adjustment time, improving calibration efficiency and reducing operating costs.

[0026] Optionally, the adjusting device comprises a plurality of groups of circulation fans, and the plurality of groups of circulation fans are arranged on a horizontal side and / or above the particle sensor calibration device.

[0027] By arranging several groups of circulating fans on the horizontal side and / or above the positioning mechanism, so that the positioning mechanism is arranged between the air suction ports of several circulating fans, when the circulating fans are working, the particulate gas in the calibration chamber is sucked so that the particulate gas flows along a preset path, thereby achieving the effect of filling the space where the sensor to be calibrated is located as evenly as possible, so as to improve the calibration accuracy. In this way, part of the particulate gas is deposited in the calibration chamber as a gas source, and part of the particulate gas is driven by the circulating fans to move toward the sensor to be calibrated.

[0028] The position and number of the circulation fans can be set accordingly according to the working needs, so that the circulation fans can pump gas to move in the direction of the sensor to be calibrated, so that the gas circulates along the preset path. For example: by arranging at least one group of circulation fans on both sides and above the positioning mechanism, and symmetrically arranging the circulation fans on both sides of the positioning mechanism, the positioning mechanism is arranged between the air inlets of the circulation fans.

[0029] Optionally, an air purification mechanism is also included, which is connected to the calibration cabin pipeline and is used to extract particulate gas inside the calibration cabin from the calibration cabin after the calibration working time of the sensor to be calibrated in the calibration cabin is completed.

[0030] By connecting the air purification mechanism to the calibration cabin pipeline, and after the calibration process is completed, in order to prevent gas from polluting the environment and to recycle the particulate gas, the high-concentration particulate gas at the bottom of the calibration cabin is uniformly extracted from the calibration cabin to ensure the stability of the calibration work.

[0031] Among them, the air purification mechanism is used to purify the gas on the one hand; on the other hand, it is to accommodate more sensors to be calibrated. Specifically: when the particles settle at the bottom, the particle concentration in the bottom space gradually increases, and the calibration parameters of the sensors to be calibrated at the bottom will have deviations; therefore, support columns can be set in the cabinet so that the environment of the sensors to be calibrated at the bottom is not the bottom of the calibration cabin, and there is a gap between them and the bottom of the calibration cabin to avoid gas concentration rebound; further, the gas purification mechanism can be set to extract gas at a preset rate, so that the particles leave the calibration cabin after settling to the bottom and completing the calibration of the sensors to be calibrated (different from the traditional synchronous gas transmission and extraction method), thereby preventing the gas particle concentration at the bottom of the calibration cabin from rebounding, and the sensors to be calibrated can also be set at the bottom. In this process, the gas purifier extracts air at a certain rate after the calibration starts to ensure the stability of the calibration work and improve the calibration accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0033] Figure 1 A schematic diagram of the structure of a particle sensor calibration device provided in an embodiment of the utility model;

[0034] Figure 2 for Figure 1 A schematic diagram of the front view structure of the particle sensor calibration device;

[0035] Figure 3 for Figure 1 The structural diagram of the positioning cabinet in FIG.

[0036] Figure 4A schematic diagram of the structure of a particle sensor calibration system provided by an embodiment of the present invention;

[0037] Figure 5 for Figure 4 Schematic diagram of the structure inside the calibration cabin;

[0038] Figure 6 for Figure 4 Schematic diagram of the front view of the interior of the calibration cabin.

[0039] Description of the drawings: 1. Gas generating mechanism, 2. Air purification mechanism, 3. Calibration cabin, 31. Positioning cabinet, 311. Horizontal limit column, 311-1. Slide groove, 311-2. Support column, 312. Mounting plate, 313. Limit plate, 32. Circulation fan, 33. Sensor to be calibrated. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0042] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0043] See also Figure 1-3One embodiment of the utility model provides a particle sensor calibration device, including a positioning cabinet 31 and a plurality of mounting plates 312, wherein the positioning cabinet 31 is provided with a plurality of groups of transverse limit units in sequence along the gravity direction; wherein each group of transverse limit units includes two transverse limit columns 311 at the same horizontal height and adjacent to each other; wherein a plurality of mounting plates 312 are distributed at intervals along the gravity direction and are respectively slidably connected with the two transverse limit columns 311 of the corresponding transverse limit units, wherein the mounting plates 312 can slide horizontally along the length direction of the transverse limit columns 311; wherein the mounting plates 312 are used to install a plurality of sensors 33 to be calibrated and at least one reference sensor.

[0044] In this embodiment, by providing a plurality of groups of lateral limit units in sequence along the direction of gravity on the positioning cabinet 31, and by slidingly connecting a plurality of mounting plates 312 with two lateral limit columns 311 of the plurality of groups of the lateral limit units in the direction of gravity, by mounting the sensor 33 to be calibrated and at least one reference sensor on the mounting plates 312, and by stacking a plurality of mounting plates 312 in sequence along the direction of gravity, during calibration, based on the characteristic of slow settling of the concentration of particulate matter in the closed calibration cabin 3, the gas at the position of each layer of sensors can all settle from "high to low concentration", and the sensors at the corresponding positions detect the gas in this process. body concentration; thereby ensuring that the sensor to be calibrated 33 and the reference sensor on the positioning cabinet 31 dynamically detect the particulate gas concentration in the calibration cabin 3, and subsequently compare the gas particle concentration detected by the sensor to be calibrated 33 with the reference data detected by the standard sensor and record the data deviation, thereby completing the calibration; thereby realizing dynamic acquisition of the gas concentration of the PM2.5 sensor calibration point, and fully automatic PM2.5 sensor calibration process, making PM2.5 sensor calibration more accurate, and at the same time simple operation for production personnel, easy to realize large-scale mass production of PM2.5 sensors, thereby reducing adjustment time, improving calibration efficiency and reducing operating costs.

[0045] Among them, by arranging several groups of transverse limit units at intervals along the gravity direction on the positioning cabinet 31, the mounting plate 312 is limited and installed by two adjacent transverse limit columns 311 at the same horizontal height, and several mounting positions for installing the sensors 33 to be calibrated are arranged on the mounting plate 312, so as to realize calibration of several sensors 33 to be calibrated, realize batch calibration, improve calibration efficiency and reduce costs.

[0046] By setting up a drawer-type cabinet and a mounting plate 312 structure, and distributing them in a hierarchical manner from high to low, automatic concentration adjustment of sedimentation is achieved, so that multiple sensors 33 to be calibrated can be calibrated quickly and accurately, batch calibration can be achieved, calibration efficiency can be improved, and costs can be reduced.

[0047] Among them, under ideal conditions, the gas concentration at various positions in the entire calibration cabin 3 first tends to be the same, and then changes in concentration due to gravity sedimentation. Specifically: since the particulate gas at the top does not obtain concentration replenishment, the particulate gas concentration at the top first shows a decreasing state; the particulate gas at other levels decreases step by step; finally, the particulate gas concentration change curves at various positions in the entire calibration cabin 3 are almost the same. Therefore, only one group of reference sensors can be set according to needs, and there is no need to set them for each layer.

[0048] See also Figure 1-3 In one embodiment, the positioning cabinet 31 is provided with a limiting plate 313 , and the limiting plate 313 is provided at one end of the transverse limiting column 311 .

[0049] In this embodiment, a limit plate 313 is provided on the positioning cabinet 31, and the limit plate 313 is provided at one end of the transverse limit column 311 to prevent the mounting plate 312 from sliding out from the other end of the transverse limit column 311 when sliding with the transverse limit column 311, thereby improving the stability of the calibration work. At the same time, the support force of the transverse limit column 311 is increased by the limit plate 313, thereby realizing the spaced arrangement of the transverse limit column 311 along the gravity direction.

[0050] See also Figure 1-3 In one embodiment, a slide groove 311-1 is provided on the opposite surfaces of the two lateral limit columns 311 of each group of lateral limit units, and a preset distance is formed between the end of the slide groove 311-1 close to the limit plate 313 and the limit plate 313, and the other end of the slide groove 311-1 is extended along the length direction of the limit plate 313 and passes through the end of the lateral limit column 311 away from the limit plate 313, and the two sides of the mounting plate 312 are respectively slidably connected with the slide grooves 311-1 on the opposite surfaces of the two adjacent lateral limit columns 311 at the same horizontal height.

[0051] See also Figure 1-3 In this embodiment, a slide groove 311-1 is provided on the opposite surfaces of two adjacent transverse limit columns 311 at the same horizontal height, so that the mounting plate 312 is slidably connected with the transverse limit column 311 through the slide groove 311-1 on the opposite surfaces of two adjacent transverse limit columns 311 at the same horizontal height, and since there is a preset distance between one end of the slide groove 311-1 close to the limit plate 313 and the limit plate 313, the other end of the slide groove 311-1 is extended along the length direction of the limit plate 313 and passes through the end of the transverse limit column 311 away from the limit plate 313, and by pushing the mounting plate 312 along the direction of the slide groove 311-1 or dragging it down from the slide groove 311-1, the sensor can be quickly installed, placed or disassembled, the difficulty of the process operation is reduced, and the calibration efficiency is improved.

[0052] Among them, by arranging multiple groups of chutes 311-1 on the positioning cabinet 31 that are sequentially spaced apart in the direction of gravity, the mounting plate 312 is slidably connected to the chutes 311-1, thereby realizing drawer-type calibration work and improving the accuracy and work efficiency of calibration.

[0053] In one embodiment, the lateral limiting post 311 includes two groups of limiting ribs. The two groups of limiting ribs are connected to both sides of the limiting plate 313. The mutually opposite ends of the two groups of limiting ribs are both formed with the chutes 311-1; all the limiting ribs are uniformly arranged in a two-column structure in the direction of gravity. One end of the limiting plate 313 is connected to all the limiting ribs, and the support post 311-2 is connected to the other end of all the limiting ribs. The number of the support posts 311-2 is two groups. The two groups of support posts 311-2 are respectively fixedly connected to all the limiting ribs on the corresponding columns one by one, and the two edges of the mounting plate 312 can be slidably connected to the corresponding chutes 311-1.

[0054] In this embodiment, the mounting plate 312 is limited by two groups of limiting ribs to ensure that the mounting plate 312 can stably slide with the chutes 311-1. By pushing the mounting plate 312 along the direction of the chutes 311-1 or dragging it out of the chutes 311-1, drawer-type disassembly and assembly are realized, so as to quickly install, place or disassemble the sensor, reduce the operation difficulty of the process, improve the calibration efficiency, and by adopting a frame structure, in addition to having the advantages of stability and material saving, it is also convenient for gas circulation and improves the sedimentation efficiency of particulate gas concentration.

[0055] In one embodiment, when looking down along the direction of gravity, the overall structure of the lateral limiting post 311 and the limiting plate 313 is arranged in a C-shaped structure; the end of the chute 311-1 away from the limiting plate 313 penetrates through the side wall of the end of the limiting rib to form a notch structure for the mounting plate 312 to enter the chute 311-1.

[0056] In this embodiment, by arranging the overall structure of the lateral limiting post 311 and the limiting plate 313 in a C-shaped structure when looking down along the direction of gravity, the overall structural strength and stability are further enhanced. By setting the notch structure, it is convenient for drawer-type disassembly and assembly of the mounting plate 312.

[0057] In one embodiment, the mounting plate 312 is provided with air holes for particulate gas to pass through. The number of the air holes is multiple groups, and the multiple groups of air holes are evenly distributed among all the mounting positions.

[0058] In this embodiment, the particulate matter gas dispersed and deposited on the mounting plate 312 can move to the next layer through the pores to prevent accumulation on the original layer mounting plate 312, thereby improving the efficiency of regulating the particulate matter gas concentration and, at the same time, improving the calibration accuracy.

[0059] See also Figure 1-3 In one embodiment, a support column 311 - 2 is further arranged between two adjacent transverse limit columns 311 arranged along the gravity direction, and the support column 311 - 2 is arranged away from the limit plate 313 , and the support column 311 - 2 is arranged close to the other end of the transverse limit column 311 .

[0060] In this embodiment, a support column 311-2 is set between two adjacent transverse limit columns 311 on the same vertical line to support the transverse limit column 311, and the support column 311-2 is set close to the other end of the transverse limit column 311 to further enhance the supporting effect of the transverse limit column 311.

[0061] See also Figure 1-3 In one embodiment, a plurality of mounting positions are provided on the top surface of any of the mounting plates 312, and all of the mounting positions on any of the mounting plates 312 are respectively used to mount a plurality of the sensors to be calibrated 33 and at least one of the reference sensors.

[0062] In this embodiment, by respectively providing a plurality of mounting positions on the top surface of the mounting plate 312, a plurality of sensors to be calibrated 33 and at least one reference sensor can be quickly installed, installation standards and calibration standards can be standardized, and work output and efficiency can be improved.

[0063] See also Figure 1-3 In one embodiment, a plurality of mounting positions are arranged in an array on the top surface of the mounting plate 312 along the X-axis direction and the Y-axis direction respectively.

[0064] In this embodiment, by arranging multiple mounting positions on the mounting plate 312 in an array along the X-axis direction and the Y-axis direction of the top surface of the mounting plate 312, the layout effect is simplified, and a number of sensors 33 to be calibrated can be quickly installed, thereby standardizing the installation standards and calibration standards.

[0065] In one embodiment, the positioning cabinet 31 is further provided with a plurality of groups of transverse limiting units in sequence along the horizontal direction.

[0066] In this embodiment, a plurality of groups of lateral limit units are arranged on the positioning cabinet 31 at intervals along the vertical and horizontal directions, and the mounting plate 312 is installed by limiting the two lateral limit columns 311 of each group of lateral limit units, and the top surface of the mounting plate 312 is arranged upward, and a plurality of mounting positions for installing a plurality of sensors 33 to be calibrated and at least one reference sensor are arranged on the mounting plate 312, thereby realizing calibration of a plurality of sensors 33 to be calibrated, realizing batch calibration, improving calibration efficiency, and reducing costs.

[0067] See also Figure 4-6 Another embodiment of the utility model further provides a particle sensor calibration system, comprising a calibration cabin 3 and a particle sensor calibration device as described above, wherein the particle sensor calibration device is arranged in the calibration cabin 3.

[0068] In this embodiment, since the beneficial effects and advantages of the particle sensor calibration device have been described in the above content, they will not be repeated here. The particle sensor calibration system includes the particle sensor calibration device, and the particle sensor calibration system also has the same beneficial effects and advantages. At the same time, by arranging the particle sensor calibration device in the calibration chamber 3, a good calibration and calibration environment is provided for the sensor to be calibrated 33, thereby improving the calibration and calibration accuracy of the sensor to be calibrated 33 on the particle sensor calibration device. Among them, a gap is set between the mounting plate 312 located at the bottom layer and the bottom wall of the calibration chamber 3.

[0069] See also Figure 4-6 In one embodiment, it also includes a gas generating mechanism 1 and a regulating device, wherein the gas generating mechanism 1 is connected to the calibration cabin 3 by a pipeline and is used to transport a preset volume of high-concentration particulate gas into the calibration cabin 3; the regulating device is arranged in the calibration cabin 3 and is used to dilute and guide the high-concentration particulate gas in the calibration cabin 3 so that the particulate gas with a preset concentration fills the entire calibration cabin 3.

[0070] In this embodiment, by connecting the calibration cabin 3 with the gas generating mechanism 1 and arranging an adjustment device in the calibration cabin 3, when it is necessary to calibrate the sensor 33 to be calibrated, a preset volume of high-concentration particulate gas is delivered to the calibration cabin 3 at one time through the gas generating mechanism 1, and a circulating fan is used to generate a driving force with a preset power to pump the preset volume of particulate gas to the middle position of the calibration cabin 3 and fill the space where the sensor 33 to be calibrated is located. After the particulate gas contacts the sensor 33 to be calibrated, it refluxes and settles to the bottom of the calibration cabin 3. Based on the characteristic of slow sedimentation of particulate concentration in the closed calibration cabin 3, the gas at the location of each layer of sensors can settle from high to low concentration, and the sensors at the corresponding positions detect the gas concentration in this process.

[0071] Through the gas generating mechanism 1 and the adjusting device, a stable calibration environment is provided for the sensor to be tested, and the gas concentration of the PM2.5 sensor calibration point is dynamically acquired. The fully automatic PM2.5 sensor calibration process makes the PM2.5 sensor calibration more accurate. At the same time, it is simple for production personnel to operate and easy to realize large-scale mass production of PM2.5 sensors, thereby reducing adjustment time, improving calibration efficiency and reducing operating costs.

[0072] The particulate gas first settles at the bottom of the calibration chamber 3, and the regulating component can pump a preset volume of particulate gas to uniformly reciprocate with the sensor to be calibrated 33. The concentration of the particulate gas is automatically adjusted by setting the pumping power of the regulating component, thereby reducing the adjustment time, improving the calibration efficiency and reducing the operating cost.

[0073] See also Figure 5 , 6 In one embodiment, the regulating device comprises a plurality of groups of circulating fans 32, and the plurality of circulating fans 32 are arranged on a horizontal side and / or above the particle sensor calibration device.

[0074] In this embodiment, by arranging several groups of circulating fans 32 on the horizontal side and / or above the particle sensor calibration device, the particle sensor calibration device is arranged between the air inlets of several circulating fans 32. When the circulating fans 32 are working, the particle gas in the calibration chamber 3 is sucked to make the particle gas 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, so as to improve the calibration accuracy. In this way, part of the particle gas is deposited in the calibration chamber as a gas source, and part of the particle gas is driven by the circulating fans 32 to move toward the sensor to be calibrated 33.

[0075] The position and number of the circulation fans 32 can be set accordingly according to work needs, so that the circulation fans 32 can pump gas to move in the direction of the sensor 33 to be calibrated, so that the gas circulates along a preset path. For example, by arranging at least one group of circulation fans 32 on both sides and above the positioning mechanism, and symmetrically arranging the circulation fans 32 on both sides of the positioning mechanism, the positioning mechanism is arranged between the air inlets of the circulation fans 32.

[0076] See also Figure 5 , 6 In one embodiment, several groups of the circulating fans 32 are respectively installed on the inner wall of the calibration cabin 3, and a preset distance is set between the air supply outlets of the circulating fans 32 and the inner wall surface of the calibration cabin 3; wherein, the air supply outlets of several groups of the circulating fans 32 are arranged toward the inner wall surface of the calibration cabin 3, and the air intake outlets of several groups of the circulating fans 32 are arranged toward the particle sensor calibration device.

[0077] In this embodiment, the air supply port of the circulating fan 32 is arranged toward the inner wall of the calibration chamber 3, so that the particulate gas sucked out from the gap between the circulating fan 32 and the wall of the calibration chamber 3 is used to utilize the rebound force of the wall of the calibration chamber 3, and is evenly distributed and flows in the calibration chamber 3. The circulating fan 32 is installed on the inner wall of the calibration chamber 3, so that the circulating fan 32 is stably installed to ensure the stability of the operation; and a preset distance is set between the air supply port of the circulating fan 32 and the inner wall of the calibration chamber 3, so that the particulate gas is sucked by the circulating fan 32, flows out from the preset distance, and is evenly distributed and flows in the calibration chamber 3.

[0078] See also Figure 4-6 In one embodiment, it also includes an air purification mechanism 2, which is connected to the calibration cabin pipeline. The air purification mechanism is used to extract the particulate matter gas inside the calibration cabin from the calibration cabin after the calibration working time of the sensor to be calibrated in the calibration cabin is completed.

[0079] In this embodiment, an air purification mechanism is connected to the calibration cabin pipeline, and after the calibration process is completed, in order to prevent gas from polluting the environment and to recycle particulate gas, the high-concentration particulate gas at the bottom of the calibration cabin is uniformly extracted from the calibration cabin to ensure the stability of the calibration work.

[0080] Among them, the air purification mechanism is used to purify the gas on the one hand; on the other hand, it is to accommodate more sensors to be calibrated. Specifically: when the particles settle at the bottom, the particle concentration in the bottom space gradually increases, and the calibration parameters of the sensors to be calibrated at the bottom will have deviations; therefore, support columns can be set in the cabinet so that the environment of the sensors to be calibrated at the bottom is not the bottom of the calibration cabin, and there is a gap between them and the bottom of the calibration cabin to avoid gas concentration rebound; further, the gas purification mechanism can be set to extract gas at a preset rate, so that the particles leave the calibration cabin after settling to the bottom and completing the calibration of the sensors to be calibrated (different from the traditional synchronous gas transmission and extraction method), thereby preventing the gas particle concentration at the bottom of the calibration cabin from rebounding, and the sensors to be calibrated can also be set at the bottom. In this process, the gas purifier extracts air at a certain rate after the calibration starts to ensure the stability of the calibration work and improve the calibration accuracy.

[0081] Working method: S100, evenly installing the sensors 33 to be calibrated on multiple groups of installation positions located in the calibration cabin 3 and arranged along the gravity direction;

[0082] Specifically, the gas generating mechanism 1 is connected to the calibration cabin 3 by a pipeline, and a reference sensor, an adjustment component and a positioning mechanism are arranged in the calibration cabin 3; the positioning mechanism is used to install the sensor 33 to be calibrated, and the positioning mechanism is provided with mounting positions distributed in sequence along the gravity direction, and all the sensors 33 to be calibrated are sequentially installed in the corresponding mounting positions;

[0083] S200, controlling the gas generating mechanism 1 to deliver a preset volume of high-concentration particulate matter gas into the calibration chamber 3, and the high-concentration particulate matter gas is deposited at the bottom of the calibration chamber 3 due to gravity;

[0084] S300: Start the circulating fan 32 arranged on the inner wall of the calibration chamber 3 and located near the sensor 33 to be calibrated, so that the circulating fan 32 generates a driving force with a preset power to pump a preset volume of particulate gas to the middle position of the calibration chamber 3 and fill the space where the sensor 33 to be calibrated is located. After the particulate gas contacts the sensor 33 to be calibrated, it flows back and settles to the bottom of the calibration chamber 3;

[0085] S400: The circulating fan 32 continues to operate at a preset power and a preset cycle until its pumping speed of the particulate gas is the same as the particulate gas settling speed, and the reference sensor arranged on one side of the sensor to be calibrated 33 feeds back the concentration of the particulate gas in the space where the sensor to be calibrated 33 is currently located to the calibration control system;

[0086] When the particles settle in the closed calibration chamber 3, the particle concentration in the bottom space gradually increases, thereby realizing dynamic real-time detection of particle concentrations at different heights, and calculating the calibration parameters of each sensor to be calibrated 33 based on the particle concentration data detected by the sensor to be calibrated 33 and the particle concentration data detected by the reference sensor. Specifically, for example:

[0087] Each layer is marked as N1 layer, N2 layer, N3 layer, etc. As the sedimentation process progresses, the particle concentration near the sensor on the N1 layer changes, then it is the turn of the N2 layer, and then the N3 layer.

[0088] Since particulate matter (such as dust) is affected by gravity, the sensor to be calibrated 33 and the corresponding reference sensor on each layer of the mounting plate 312 will experience a change in the concentration of the ambient particulate matter gas from high to low (the particulate matter moves to the calibration chamber 3 and settles due to gravity);

[0089] Therefore, during the calibration process, each layer of the to-be-calibrated sensor 33 continuously records the particle concentration data in the vicinity, and at the same time, the reference sensor also continuously records the particle concentration data;

[0090] S500: The calibration control system compares the particle gas concentration value detected by the reference sensor with the particle gas concentration value detected by the sensor to be calibrated 33, and performs corresponding calibration according to the comparison result;

[0091] The changing trends of gas concentrations near sensors to be calibrated at different heights are the same, but the time points of the changes are different. However, the time taken for the gas concentrations in each layer to change is the same.

[0092] By combining the particle concentration data detected at different heights and performing unified calculations based on the detection results of each sensor 33 to be calibrated and the corresponding reference sensor, the calibration parameters of each sensor 33 to be calibrated are obtained, and finally the calibration parameters of each sensor 33 to be calibrated are written into each sensor 33 to be calibrated, thereby completing the calibration work of several sensors 33 to be calibrated.

[0093] S600: inputting preset power parameters and preset cycle parameters to the circulation fan according to different particle gas concentrations, repeating S400 to S500, so that the sensor to be calibrated completes the calibration process corresponding to different particle gas concentrations;

[0094] S700: Controlling the air purification mechanism to extract the particulate matter gas inside the calibration chamber from the calibration chamber.

[0095] Specific workflow: see Figure 6, a preset volume of high-concentration particulate gas is delivered to the calibration chamber at one time through the gas generating mechanism, and a preset volume of particulate gas is pumped into the space where the sensor 33 to be calibrated is located through the regulating component, so that the particulate gas of the preset concentration is dynamically filled in the vicinity of the sensor 33 to be calibrated. During calibration, based on the characteristic that gas particles will settle in the closed calibration chamber 3, the regulating component controls the pumping power and pumping cycle of the particulate gas, so that different volumes of particulate gas reciprocate through the environment where the sensor 33 to be calibrated is located along a preset path, so that the particle concentrations at the locations of the sensors on each layer can be automatically and synchronously adjusted, and the calibration control system records the detection values ​​of all sensors 33 to be calibrated in environments with different particulate gas concentrations, and compares the particle gas concentration values ​​detected by the sensors 33 to be calibrated with the particle gas concentration values ​​detected by the reference sensors. The standard particle gas concentration value is compared and the numerical deviation is calculated to complete the calibration; thereby, in the process of a single particle gas input calibration, the particle gas concentration at the particle sensor calibration point is adjusted conveniently and efficiently, so that the particle sensor calibration device can achieve space optimization, and the operation is simple for production personnel. In the calibration process of large-scale mass production of particle sensors, efficient and automatic adjustment of the particle gas concentration is achieved. Compared with the traditional method of adjusting the gas concentration by simultaneous gas transmission and intake, the calibration device can effectively reduce the adjustment time, improve the execution efficiency of the calibration process, and reduce the redundant cost of sensor production and operation, and complete the calibration work of the whole process fully automatically. The operation is very simple for the operator, and a plurality of sensors 33 to be calibrated are positioned through the positioning cabinet 31, thereby realizing batch calibration of the sensor matrix, which is easy to achieve mass production.

[0096] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A particle sensor calibration device, characterized in that: include: A positioning cabinet, wherein the positioning cabinet is provided with a plurality of groups of transverse limiting units in sequence along the direction of gravity; wherein each group of transverse limiting units comprises two transverse limiting columns at the same horizontal height and adjacent to each other; A plurality of mounting plates are spaced apart along the gravity direction and are respectively slidably connected to the two lateral limit columns of the corresponding lateral limit unit, and the mounting plates can slide horizontally along the length direction of the lateral limit columns; wherein the mounting plates are used to mount a plurality of sensors to be calibrated and at least one reference sensor.

2. The particle sensor calibration device according to claim 1, characterized in that: The positioning cabinet is provided with a limiting plate, and the limiting plate is arranged at one end of the transverse limiting column.

3. The particle sensor calibration device according to claim 2, characterized in that: Slide grooves are arranged on the opposite surfaces of the two transverse limit columns of each group of transverse limit units, and a preset distance is formed between the end of the slide groove close to the limit plate and the limit plate, and the other end of the slide groove is extended along the length direction of the limit plate and passes through the end of the transverse limit column away from the limit plate, and the two sides of the mounting plate are respectively slidably connected with the slide grooves on the opposite surfaces of two adjacent transverse limit columns at the same horizontal height.

4. The particle sensor calibration device according to claim 2, characterized in that: A support column is further arranged between two adjacent transverse limiting columns arranged along the gravity direction. The support column is arranged away from the limiting plate and is arranged close to the other end of the transverse limiting column.

5. The particle sensor calibration device according to any one of claims 1 to 4, characterized in that: A plurality of mounting positions are arranged on the top surface of any of the mounting plates, and all of the mounting positions on any of the mounting plates are respectively used to mount a plurality of the sensors to be calibrated and at least one reference sensor.

6. The particle sensor calibration device according to any one of claims 1 to 4, characterized in that: The positioning cabinet is also provided with a plurality of groups of the lateral limiting units in sequence along the horizontal direction.

7. A particle sensor calibration system, characterized in that: include: Calibration cabin; The particle sensor calibration device according to any one of claims 1 to 6, wherein the particle sensor calibration device is arranged in the calibration cabin.

8. The sensor calibration system according to claim 7, characterized in that: Also includes: A gas generating mechanism, the gas generating mechanism being connected to the calibration chamber pipeline and used for delivering a preset volume of high-concentration particulate matter gas into the calibration chamber; The regulating device is arranged in the calibration chamber and is used to dilute and guide the high-concentration particulate matter gas in the calibration chamber so that the particulate matter gas with a preset concentration fills the space where the sensor to be calibrated is located.

9. The sensor calibration system according to claim 8, characterized in that: The regulating device comprises a plurality of groups of circulation fans, and the plurality of groups of circulation fans are arranged at the horizontal side and / or above the particle sensor calibration device.

10. The sensor calibration system according to claim 7 or 8, characterized in that: It also includes an air purification mechanism, which is connected to the calibration cabin pipeline and is used to extract particulate gas inside the calibration cabin from the calibration cabin after the calibration working time of the sensor to be calibrated in the calibration cabin is completed.

Images