Direct-reading dust measuring instrument

Abstract

The invention is applicable to the technical field of dust measurement, and relates to a direct-reading dust measuring instrument which comprises a feeding assembly, an identification assembly is mounted at the bottom end of the feeding assembly, a shading assembly is mounted on one side of the identification assembly, a laser assembly is mounted on one side, away from the shading assembly, of the identification assembly, and an air blowing assembly is mounted at the bottom of the identification assembly. The recognition assembly comprises a recognition block, a feeding hole is formed in the top of the recognition block, and two sets of matching holes are symmetrically formed in the side wall of the recognition block. The sensor assembly comprises a high-concentration sensor arranged in the horizontal direction and a low-concentration sensor arranged at the bottom of the air blowing assembly. The device solves the problems that when laser directly irradiates the interior of the measuring instrument, the laser directly irradiates the end face, after the end face receives the laser, all the laser cannot be absorbed, certain refraction and reflection effects exist, and therefore the measuring result is affected, and the purpose of reducing the influence of laser heating and laser refraction on the measuring result is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of dust measurement, and more specifically, to a direct-reading dust measuring instrument. Background Art

[0002] The direct-reading dust detector is a portable, high-precision dust concentration measuring instrument, which is widely used in industrial dust emission monitoring, indoor air quality testing and other fields. The direct-reading dust detector usually uses optical principles, such as laser scattering principle, to measure the number and concentration of dust particles in the air.

[0003] Laser scattering is a technique used to measure particle size and concentration. The basic principle is that when light waves encounter particles, they scatter. The size and number of particles affect the intensity and distribution of the scattered light. By measuring these parameters, the particle size and concentration can be inferred.

[0004] In dust concentration detection, the laser scattering method determines the number and mass concentration of dust particles in the air by measuring the intensity of scattered light. This method is fast, accurate and highly sensitive, and is suitable for dust monitoring in various environments and industrial processes. For example, the laser dust meter can directly read the dust mass concentration, has the ability to produce results in one minute, and has a self-calibration system and clean air self-cleaning function to ensure that the optical system is not contaminated.

[0005] However, although the laser scattering method can perform detection efficiently and quickly, it is inevitable that there will be interference from sunlight and light during the actual detection process, which will lead to inaccurate detection data. Although this problem can be avoided by testing in a dark environment, when the laser is directly shot into the inside of the measuring instrument, it will be directly shot into the end face. After the end face receives the laser, it cannot absorb all of the laser, and there will be a certain refraction and reflection effect, which will affect the measurement results.

[0006] The laser scattering method not only has the problem of light interference, but in the actual detection process, when the laser is directly irradiated to the end face, the end face is usually made of highly light-absorbing materials in order to reduce light interference. When the laser is irradiated to the end face, the end face will absorb the energy of the laser. When the end face has a high absorption rate to the laser wavelength, more light energy will be converted into heat energy, which will cause the air here to become hot. The rising hot air will exchange with the unheated air, resulting in air flow fluctuations inside the measuring instrument, which may cause errors in the detection results. Summary of the invention

[0007] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a direct-reading dust measuring instrument that can heat the air to avoid errors caused by excessive internal airflow exchange after the temperature rises due to the laser, and can read high and low dust concentrations.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A direct-reading dust measuring instrument comprises a feeding component, an identification component is installed at the bottom end of the feeding component, a shading component is installed on one side of the identification component, a laser component is installed on the side of the identification component away from the shading component, and a blowing component is installed at the bottom of the identification component; the identification component comprises an identification block, a feeding hole is opened on the top of the identification block, and two groups of matching holes are symmetrically opened on the side wall of the identification block; the sensor component comprises a high-concentration sensor arranged in a horizontal direction, and a low-concentration sensor arranged at the bottom of the blowing component.

[0010] By adopting the above technical solution, when the airflow enters the identification block, the high concentration sensor performs measurement and identification. Since the unit of the high concentration sensor is set to milligrams per cubic meter (mg / m 3 ), when the dust content in the air is less than 1 mg / m 3 ), the output data is 0. At this moment, the air enters the low concentration sensor for identification. The low concentration sensor unit is set to micrograms per cubic meter (μg / m 3 ), so that it can be identified. The cooperation of the two sets of sensors can realize the identification of dust concentrations with different quantitative differences, thereby improving the measurement range of the device.

[0011] The present invention is further configured as follows: the feed assembly comprises a feed top block, the feed top block is configured as a cylindrical structure with a circular hole at the bottom, a group of feed grooves are respectively provided at symmetrical positions on both sides of the feed top block, a material transfer piece is installed at the bottom of the feed top block, the feed top block has the same diameter as the material transfer piece, and a feed hopper is connected to the bottom of the material transfer piece.

[0012] By adopting the above technical scheme, the feed enters through the feed slot opened on the feed top block, then passes through the material transfer piece, and then reaches the hopper, and enters the inside of the measuring instrument through the hopper. The feed top block can ensure that there is enough air to enter the measuring instrument for detection, and its top is closed, thereby preventing sunlight from entering the inside of the measuring instrument through the feed assembly, causing the light to affect the result of laser scattering; the material transfer piece can allow the air entering the feed top block to pass, and at the same time, the material transfer piece can further prevent the entry of sunlight, and the material transfer piece can isolate the small amount of sunlight entering the feed top block.

[0013] The present invention is further configured as follows: a mounting groove is provided on a side wall of the identification block, the mounting groove is adapted to the shape of the high-concentration sensor, and the high-concentration sensor is plugged into the mounting groove.

[0014] The present invention is further configured as follows: a heating top groove is arranged inside the identification block, a heating bottom groove is arranged at a distance from the heating top groove, and two groups of grooves are respectively opened in the heating bottom groove near the matching hole.

[0015] By adopting the above technical scheme, in order to prevent the heat generated by the laser from causing the air temperature to rise and thus disrupting the internal airflow, the air inside the identification block is heated by heating the top groove and the bottom groove, so that the air inside the identification block maintains the same temperature. This can ensure that the hot air will not exchange with the unheated air due to the rising hot air, thereby causing chaotic airflow fluctuations inside the measuring instrument, which may lead to errors in the detection results.

[0016] The present invention is further configured as follows: the shading component includes a bending tube, a matching tube is provided at one end of the bending tube close to the identification block, the matching tube is adapted to the shape of the matching hole, a shading hole is opened on the side wall of the bending tube, and a light absorbing component is rotatably connected to the bottom of the bending tube.

[0017] The present invention is further configured as follows: the light-shielding hole is plugged with a mounting plate, the mounting plate is adapted to the shape of the light-shielding hole, a light-absorbing module is installed at the bottom of the mounting plate, and a matching tube is installed on the side of the light-absorbing module away from the mounting plate.

[0018] The present invention is further configured as follows: the light absorbing module includes a base plate at the bottom of the mounting plate, two groups of rotating blocks are installed at one end of the base plate away from the mounting plate, the two groups of rotating blocks are symmetrically arranged, and a matching block is rotatably connected between the two groups of rotating blocks, and the matching block is adapted in shape to the two groups of rotating blocks.

[0019] The present invention is further configured as follows: a telescopic rod is installed at the bottom of the matching block, the other end of the telescopic rod is connected to the light absorbing plate, and a fixing piece is installed on one side wall of the matching block.

[0020] The present invention is further configured as follows: a connecting piece is installed at one end of the two groups of rotating blocks away from the bottom plate, a rotating cylinder is installed at one end of the connecting piece away from the bottom plate, and a fixing piece is connected to the other side of the rotating cylinder.

[0021] By adopting the above technical solution, the matching block can be driven to rotate relative to the two groups of rotating blocks by rotating the cylinder. At the same time, during the angle adjustment process, if the adjustment angle is too large, the area of ​​the light-absorbing plate facing the laser may become smaller. The telescopic rod can be extended and retracted to drive the light-absorbing plate to move in the vertical direction, ensuring that after the angle is changed, the area of ​​the light-absorbing plate facing the laser can be prevented from being too small, thereby causing the angle of the light-absorbing plate connected thereunder to be adjusted. During the actual measurement process, the laser angle may not be horizontal. At this time, if the angle of the light-absorbing plate is fixed and cannot be adjusted, the light-absorbing plate angle and the laser angle may not be the optimal output angle of the anti-refraction light beam, thereby causing the light on the light-absorbing plate to be refracted to the measurement point, and the light will affect the laser scattering result, thereby affecting the measurement result.

[0022] The present invention is further configured as follows: the laser assembly includes a light input tube, one end of the light input tube is connected to a connecting tube, the connecting tube is adapted to the shape of the matching hole, the light input tube is provided with a light input hole away from the connecting tube, and a filter is installed at one end of the connecting tube away from the light input tube.

[0023] By adopting the above technical solution, a filter is installed at one end of the connecting tube away from the light input tube. The filter is set to a filter type that can allow laser to pass through. The filter can allow the laser to pass through while reflecting other light entering from the light input hole to the outside, so as to prevent other light from affecting the laser scattering process; and installing the filter here can not only isolate the light interference at the light input hole, but also separate the laser component from the identification block. The laser component is the first part to contact the laser, and the laser component has a small diameter, which will generate higher heat and cause the air flow speed inside it to be too fast. If the filter is not set, the airflow enters the identification block from the matching hole, which will cause the airflow in the identification block to be turbulent, affecting the measurement effect, and may produce error results.

[0024] In summary, the present application includes at least one of the following beneficial technical effects of a direct-reading dust measuring instrument:

[0025] 1. It enters through the feed slot opened on the feed top block, then passes through the material transfer piece, and then reaches the hopper, and enters the measuring instrument through the hopper. The feed top block can ensure that there is enough air to enter the measuring instrument for detection, and its top is closed, thereby preventing sunlight from entering the measuring instrument through the feed component, causing the light to affect the result of laser scattering; the material transfer piece can allow the air entering the feed top block to pass, and at the same time, the material transfer piece can further prevent the entry of sunlight, and the material transfer piece can isolate the small amount of sunlight entering the feed top block.

[0026] 2. A filter is installed at one end of the connecting tube away from the light input tube. The filter is set to a filter type that can allow laser to pass through. The filter can allow the laser to pass through while reflecting other light entering from the light input hole to the outside to prevent other light from affecting the laser scattering process. Installing the filter here can not only isolate light interference at the light input hole, but also separate the laser component from the identification block. The laser component is the first part to contact the laser, and the laser component has a small diameter, which will generate higher heat and cause the air flow speed inside it to be too fast. If the filter is not set, the airflow enters the identification block from the matching hole, which will cause the airflow in the identification block to be turbulent, affecting the measurement effect and may produce error results.

[0027] 3. The rotating cylinder can drive the matching block to rotate relative to the two sets of rotating blocks. At the same time, during the angle adjustment process, if the adjustment angle is too large, the area of ​​the light-absorbing plate facing the laser may become smaller. The telescopic rod can be extended and retracted to drive the light-absorbing plate to move in the vertical direction, ensuring that after the angle is changed, the area of ​​the light-absorbing plate facing the laser can be prevented from being too small, thereby causing the angle of the light-absorbing plate connected below to be adjusted. In the actual measurement process, the laser angle may not be horizontal. At this time, if the angle of the light-absorbing plate is fixed and cannot be adjusted, the light-absorbing plate angle and the laser angle will not be the optimal output angle of the anti-refraction light beam, resulting in the light on the light-absorbing plate being refracted to the measurement point. The light will affect the laser scattering result, thereby affecting the measurement result.

[0028] 4. When the airflow enters the identification block, the high concentration sensor performs measurement and identification. Since the unit of the high concentration sensor is set to milligrams per cubic meter (mg / m 3 ), when the dust content in the air is less than 1 mg / m 3 ), the output data is 0. At this moment, the air enters the low concentration sensor for identification. The low concentration sensor unit is set to micrograms per cubic meter (μg / m 3 ), so that it can be identified. The cooperation of the two sets of sensors can realize the identification of dust concentrations with different quantitative differences, thereby improving the measurement range of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The present invention is a schematic structural diagram of a direct-reading dust concentration measuring instrument.

[0030] Figure 2 It is a schematic diagram of the explosion of the feed assembly in the present invention.

[0031] Figure 3 An exploded schematic diagram of the identified components in the present invention.

[0032] Figure 4It is a schematic diagram of the explosion of the shading component in the present invention.

[0033] Figure 5 It is a connection diagram of the light absorption module in the present invention.

[0034] Figure 6 It is a structural schematic diagram of the light absorption module in the present invention.

[0035] Figure 7 It is a schematic diagram of the structure of the laser assembly in the present invention.

[0036] Description of reference numerals: 1, feed assembly; 11, feed top block; 12, feed trough; 13, material transfer member; 14, feed hopper;

[0037] 2. Identification component; 21. Identification block; 211. Feed hole; 212. Mounting slot; 213. Matching hole; 22. Heating top slot; 23. Heating bottom slot; 24. Groove;

[0038] 3. Light-shielding assembly; 31. Bending tube; 32. Light-absorbing member; 33. Mounting plate; 34. Light-absorbing module; 341. Bottom plate; 342. Rotating block; 343. Matching block; 344. Rotating cylinder; 345. Telescopic rod; 346. Connecting member; 347. Fixing member; 35. Matching tube; 36. Light-shielding hole; 37. Light-absorbing plate;

[0039] 4. Laser assembly; 41. Light inlet tube; 42. Light inlet hole; 43. Connecting tube; 44. Filter;

[0040] 5. Sensor assembly; 51. High concentration sensor; 52. Low concentration sensor;

[0041] 6. Blowing assembly. DETAILED DESCRIPTION

[0042] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0043] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0044] See also Figure 1-7 , the present invention provides the following technical solutions:

[0045] For example, see Figure 1-7A direct-reading dust measuring instrument includes a feed component 1, which can supply air and prevent external light from entering the measuring instrument to cause light interference and reduce the accuracy. An identification component 2 is installed at the bottom of the feed component 1. The identification component 2 is used as a place to identify the incoming airflow. The dust content in the airflow can be detected at the identification component 2. A shading component 3 is installed on one side of the identification component 2. The shading component 3 can absorb the laser emitted by the laser component 4 to prevent the laser emitted by the laser component 4 from being reflected or refracted, resulting in errors in the measurement effect. A laser component 4 is installed on the side of the identification component 2 away from the shading component 3. The laser component 4 can emit laser. A blowing component 6 is installed at the bottom of the identification component 2. The blowing component 6 can draw external air into the measuring instrument so that detection can be performed.

[0046] See also Figure 1 The feed assembly 1 includes a feed top block 11, which is a cylindrical structure with a circular hole at the bottom. A group of feed slots 12 are respectively opened at symmetrical positions on both sides of the feed top block 11. The cooperation between the feed top block 11 and the feed slots 12 can ensure that sufficient air enters while achieving a shading effect. A material transfer piece 13 is installed at the bottom of the feed top block 11. The feed top block 11 and the material transfer piece 13 have the same diameter. The feed top block 11 and the material transfer piece 13 are adapted in shape. A feed hopper 14 is connected to the bottom of the feed hopper 13. The top diameter of the feed hopper 14 is the same as the diameter of the feed hopper 13. The bottom of the feed hopper 14 is set to a conical structure, which facilitates the passage of air and dust.

[0047] Specifically, air enters the measuring instrument through the feed component 1, and the feed component 1 can be removed from the entire device, so that the device can be removed during transportation or carrying, and the feed component 1 can be disassembled and cleaned, thereby avoiding the accumulation of dust and powder inside the feed component 1, which may lead to inaccurate measurement results.

[0048] Specifically, the material enters through the feed slot 12 opened on the feed top block 11, then passes through the material transfer piece 13, and then reaches the hopper 14, and enters the interior of the measuring instrument through the hopper 14. The feed top block 11 can ensure that there is enough air to enter the measuring instrument for detection, and its top is closed, thereby preventing sunlight from entering the interior of the measuring instrument through the feed assembly 1, causing the light to affect the result of laser scattering; the material transfer piece 13 can allow the air entering the feed top block 11 to pass through, and at the same time, the material transfer piece 13 can further prevent the entry of sunlight, and the material transfer piece 13 can isolate the small amount of sunlight entering the feed top block 11.

[0049] See also Figure 3The identification component 2 includes an identification block 21, which is set as a hollow rectangular structure. The internal cavity of the identification block 21 can store air, so that the air transmitted by the feed component 1 can be laser scattered here. A feed hole 211 is provided on the top of the identification block 21. The feed hole 211 is adapted to the shape of the feed component 1, and the feed hole 211 can be installed for the feed component 1. Two groups of matching holes 213 are symmetrically provided on the side wall of the identification block 21. One group of matching holes 213 is installed with the shading component 3, and the other group of matching holes 213 is installed with the laser component 4. A hole is provided at the bottom of the identification component 2, and a blowing component 6 is installed at the hole.

[0050] See also Figure 7 The laser assembly 4 includes a light input tube 41, which can allow laser to pass through. One end of the light input tube 41 is connected to a connecting tube 43, which provides a channel for the laser to pass through. The connecting tube 43 has the same diameter as the matching hole 213 and is adapted in shape. The light input tube 41 is provided with a light input hole 42 away from the connecting tube 43. A laser transmitter can be connected to the light input hole 42, where the laser is received, and the laser enters the measuring instrument from the light input hole 42. A filter 44 is installed at one end of the connecting tube 43 away from the light input tube 41. The filter 44 is set to a filter type that can allow laser to pass through. The filter 44 can allow the laser to pass through while reflecting other light entering from the light input hole 42 to the outside, so as to prevent other light from affecting the laser scattering process. In addition, installing the filter 44 here can not only isolate the light interference at the light input hole 42, but also separate the laser component 4 from the identification block 21. The laser component 4 is the first part to contact the laser, and the laser component 4 has a small diameter, which will generate higher heat and cause the air flow speed inside it to be too fast. If the filter 44 is not set, the airflow enters the identification block 21 from the matching hole 213, which will cause the airflow in the identification block 21 to be turbulent, affecting the measurement effect and possibly causing error results.

[0051] For example 2, please refer to Figure 1 , Figure 4-6 , this second embodiment makes the following improvements on the basis of the first embodiment. Although the first embodiment can realize the transportation of air into the measuring instrument and then perform detection, in the actual measurement process, after the laser is emitted from the laser component 4 into the identification component 2, when it is directly irradiated to the identification component 2, it will be directly irradiated to the end face. After the end face receives the laser, it cannot absorb all the laser, and there will be a certain refraction and reflection effect, which will affect the measurement result. Therefore, it is necessary to set up a mechanism that can handle this phenomenon to solve the reflection and refraction problem of the laser.

[0052] See also Figure 1 , Figure 4The matching hole 213 is provided with a light shielding component 3, which includes a bending tube 31. A matching tube 35 is provided at one end of the bending tube 31 close to the identification block 21. The matching tube 35 is adapted to the matching hole 213 in shape and is installed on the matching hole 213 through the matching tube 35. A light shielding hole 36 is provided on the side wall of the bending tube 31. A light absorbing member 32 is rotatably connected to the bottom of the bending tube 31. The light absorbing member 32 can further absorb the light that is not absorbed by the bending tube 31, so as to avoid the light from being reflected and refracted again, thereby affecting the measurement result.

[0053] See also Figure 4 , Figure 5 The light shielding hole 36 is plugged with a mounting plate 33, which matches the shape of the light shielding hole 36. The mounting plate 33 prevents light from entering the measuring instrument from the light shielding hole 36, thereby causing external light to affect the laser scattering result. A light absorbing module 34 is installed at the bottom of the mounting plate 33, and a light absorbing plate 37 is connected to the bottom of the light absorbing module 34. The light absorbing module 34 can adjust itself, so that the light absorbing plate 37 connected below it can adjust the angle and height.

[0054] See also Figure 5 , Figure 6 The light absorption module 34 includes a bottom plate 341, which is mounted on the bottom of the mounting plate 33. Two groups of rotating blocks 342 are mounted on one end of the bottom plate 341 away from the mounting plate 33. The two groups of rotating blocks 342 are symmetrically arranged, and a cavity is formed between the two groups of rotating blocks 342. A matching block 343 is rotatably connected between the two groups of rotating blocks 342. The matching block 343 is adapted in shape to the two groups of rotating blocks 342, and the matching block 343 can rotate relative to the rotating block 342. A telescopic rod 345 is installed at the bottom of the matching block 343, and the telescopic rod 345 can be telescoped relative to the matching block 343. The other end of the telescopic rod 345 is connected to a light absorption plate 37, and the light absorption plate 37 is set to a light absorption material to absorb laser light.

[0055] See also Figure 5 , Figure 6 A fixing piece 347 is installed on the side wall of one side of the matching block 343, and a rotating cylinder 344 is connected to the fixing piece 347. The fixing piece 347 provides an installation position for the rotating cylinder 344, ensuring that the rotating cylinder 344 can be stably extended and retracted without shaking during actual use. A connecting piece 346 is installed at one end of the two groups of rotating blocks 342 away from the bottom plate 341. The connecting piece 346 can ensure that the distance between the two groups of rotating blocks 342 will not change, and the connecting piece 346 provides an installation position for the rotating cylinder 344, and a rotating cylinder 344 is installed at one end of the connecting piece 346 away from the bottom plate 341.

[0056] Specifically, by rotating the cylinder 344, the matching block 343 can be driven to rotate relative to the two sets of rotating blocks 342. At the same time, during the angle adjustment process, if the adjustment angle is too large, the area of ​​the light absorbing plate 37 facing the laser may become smaller. The telescopic rod 345 can be telescoped to drive the light absorbing plate 37 to move in the vertical direction, ensuring that after the angle is changed, the area of ​​the light absorbing plate 37 facing the laser can be prevented from being too small, thereby causing the angle of the light absorbing plate 37 connected thereto to be adjusted. During the actual measurement process, the laser angle may not be horizontal. At this time, if the angle of the light absorbing plate 37 is fixed and cannot be adjusted, the angle of the light absorbing plate 37 and the laser angle may not be the optimal output angle of the anti-refraction light beam, thereby causing the light on the light absorbing plate 37 to be refracted to the measurement point, and the light will affect the laser scattering result, thereby affecting the measurement result.

[0057] For example 3, please refer to Figure 1-7 , this embodiment 3 makes the following improvements on the basis of embodiment 1. Although the transmission of air and measurement can be achieved through embodiment 1 and embodiment 2, the laser scattering method not only has the problem of light interference, but also in the actual detection process, when the laser is directly irradiated to the end face, the end face usually uses a high light absorption material to reduce light interference. When the laser irradiates the end face, the end face will absorb the energy of the laser. When the end face has a high absorption rate to the laser wavelength, more light energy will be converted into heat energy, which will cause the air here to become hot. The rising hot air will exchange with the unheated air, so there will be chaotic air flow fluctuations inside the measuring instrument, which may cause errors in the detection results.

[0058] See also Figure 2 A heating top groove 22 is provided inside the identification block 21, and the heating top groove 22 is adapted to the shape of the inner wall of the identification block 21, and the air here can be heated by heating the top groove 22. A heating bottom groove 23 is provided at a distance from the heating top groove 22, and the heating bottom groove 23 is adapted to the shape of the inner wall of the identification block 21, and the air here can be heated by heating the bottom groove 23. Two groups of grooves 24 are respectively provided near the matching hole 213 of the heating bottom groove 23, and the grooves 24 avoid blocking the laser.

[0059] Specifically, in order to prevent the heat generated by the laser from causing the air temperature to rise and thus disrupting the internal airflow, the air inside the identification block 21 is heated by heating the top groove 22 and the bottom groove 23, so that the air inside the identification block 21 maintains the same temperature, which can ensure that the hot air will not exchange with the unheated air due to the rising hot air, thereby causing chaotic airflow fluctuations inside the measuring instrument, which may lead to errors in the detection results.

[0060] See also Figure 1The side wall of the identification block 21 is provided with a mounting groove 212, which is adapted to the shape of the high concentration sensor 51. The high concentration sensor 51 is plugged into the mounting groove 212. The unit of the high concentration sensor 51 is set to milligrams per cubic meter (mg / m 3 ), a low concentration sensor 52 is installed at the bottom of the blowing assembly 6, and the unit of the low concentration sensor 52 is set to micrograms per cubic meter (μg / m 3 ).

[0061] Specifically, when the airflow enters the identification block 21, the high concentration sensor 51 performs measurement and identification. Since the unit of the high concentration sensor 51 is set to milligrams per cubic meter (mg / m 3 ), when the dust content in the air is less than 1 mg / m 3 ), then the output data is 0. At this moment, the air enters the low concentration sensor 52 for identification. The unit of the low concentration sensor 52 is set to micrograms per cubic meter (μg / m 3 ), so that it can be identified. The cooperation of the two sets of sensors can realize the identification of dust concentrations with different quantitative differences, thereby improving the measurement range of the device.

[0062] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

Claims

1. A direct-reading dust measuring instrument, characterized in that: It comprises a feeding component (1), an identification component (2) is installed at the bottom end of the feeding component (1), a light shielding component (3) is installed on one side of the identification component (2), a laser component (4) is installed on the side of the identification component (2) away from the light shielding component (3), and a blowing component (6) is installed at the bottom of the identification component (2); The identification component (2) comprises an identification block (21), a feeding hole (211) is provided on the top of the identification block (21), and two groups of matching holes (213) are symmetrically provided on the side wall of the identification block (21); The sensor assembly (5) comprises a high concentration sensor (51) arranged in a horizontal direction and a low concentration sensor (52) arranged at the bottom of the blowing assembly (6).

2. A direct-reading dust measuring instrument according to claim 1, characterized in that: The feed assembly (1) comprises a feed top block (11), the feed top block (11) being a cylindrical structure with a circular hole at the bottom, a group of feed grooves (12) being respectively provided at symmetrical positions on both sides of the feed top block (11), a material transfer member (13) being installed at the bottom of the feed top block (11), the feed top block (11) and the material transfer member (13) having the same diameter, and a feed hopper (14) being connected to the bottom of the material transfer member (13).

3. A direct-reading dust measuring instrument according to claim 1, characterized in that: The side wall of the identification block (21) is provided with a mounting groove (212), the mounting groove (212) is adapted in shape to the high-concentration sensor (51), and the high-concentration sensor (51) is plugged into the mounting groove (212).

4. A direct-reading dust measuring instrument according to claim 1, characterized in that: A heating top groove (22) is arranged inside the identification block (21), a heating bottom groove (23) is arranged at a distance from the heating top groove (22), and two groups of grooves (24) are respectively opened near the matching hole (213) of the heating bottom groove (23).

5. A direct-reading dust measuring instrument according to claim 4, characterized in that: The shading component (3) comprises a bending tube (31), a matching tube (35) is arranged at one end of the bending tube (31) close to the identification block (21), the matching tube (35) is adapted in shape to the matching hole (213), a shading hole (36) is opened on the side wall of the bending tube (31), and a light absorbing member (32) is rotatably connected to the bottom of the bending tube (31).

6. A direct-reading dust measuring instrument according to claim 5, characterized in that: The light shielding hole (36) is plugged with a mounting plate (33), the mounting plate (33) and the light shielding hole (36) are adapted in shape, a light absorbing module (34) is mounted on the bottom of the mounting plate (33), and a light absorbing plate (37) is mounted on the side of the light absorbing module (34) away from the mounting plate (33).

7. A direct-reading dust measuring instrument according to claim 6, characterized in that: The light absorbing module (34) comprises a bottom plate (341) connected to the bottom of the mounting plate (33); two groups of rotating blocks (342) are installed at one end of the bottom plate (341) away from the mounting plate (33); the two groups of rotating blocks (342) are symmetrically arranged; a matching block (343) is rotatably connected between the two groups of rotating blocks (342); and the matching block (343) is adapted in shape to the two groups of rotating blocks (342).

8. A direct-reading dust measuring instrument according to claim 7, characterized in that: A telescopic rod (345) is installed at the bottom of the matching block (343), the other end of the telescopic rod (345) is connected to the light absorbing plate (37), and a fixing piece (347) is installed on a side wall of one side of the matching block (343).

9. A direct-reading dust measuring instrument according to claim 8, characterized in that: A connecting piece (346) is installed at one end of the two groups of rotating blocks (342) away from the bottom plate (341), a rotating cylinder (344) is installed at one end of the connecting piece (346) away from the bottom plate (341), and a fixing piece (347) is connected to the other side of the rotating cylinder (344).

10. A direct-reading dust measuring instrument according to claim 1, characterized in that: The laser assembly (4) comprises a light input tube (41), one end of the light input tube (41) is connected to a connecting tube (43), the connecting tube (43) is adapted in shape to the matching hole (213), a light input hole (42) is provided on the light input tube (41) away from the connecting tube (43), and a filter (44) is installed on one end of the connecting tube (43) away from the light input tube (41).

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