An online laser particle size analyzer

Abstract

The present invention relates to an online laser particle size analyzer, which belongs to the technical field of powder detection. The online laser particle size analyzer comprises: a main body, an optical space for detecting powder is provided in the main body; a powder spraying tube, one end of which penetrates into the main body and is located in the optical space for discharging powder, and the other end of which is provided with a sampling port for extracting powder; a waste powder extraction tube, one end of which penetrates into the main body and is located in the optical space for collecting waste powder, one end of which is arranged opposite to one end of the powder spraying tube, and a detection channel is left; a laser generator, which is located in the main body, and the laser generator generates a laser beam passing through the detection channel; a multi-element photoelectric detector, and the laser beam generated by the laser emitter passes through the detection channel to detect the powder particle size at the detection channel. The online laser particle size analyzer can detect the powder particle size online, is easy to operate, and detects in time, and can adjust the production of powder in time.

Description

Technical Field

[0001] The invention belongs to the technical field of powder detection, and in particular relates to an online laser particle size analyzer. Background Art

[0002] A particle size analyzer is an instrument that uses physical methods to test the size and distribution of solid particles. It can be divided into nanoparticle size analyzers, laser particle size analyzers, single particle light obstruction particle size analyzers, and image particle size analyzers.

[0003] The current particle size analyzer cannot perform online testing on the produced powders. It can only test the powders after production. This often leads to untimely testing, excessive unqualified powders, and increased costs for the enterprise. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an online laser particle size analyzer, which can detect the particle size of powder online, is easy to operate, detects in time, and can adjust the production of powder in time.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: an online laser particle size analyzer, comprising:

[0006] A main body, wherein an optical space for detecting powder is provided in the main body;

[0007] A powder spraying tube, one end of which penetrates the main body and is located in the optical space for discharging powder, and the other end of which is provided with a sampling port for extracting powder;

[0008] A waste powder extraction pipe, one end of which penetrates the main body and is located in the optical space for collecting waste powder, one end of which is arranged opposite to one end of the powder spraying pipe and has a detection channel;

[0009] A laser generator, the laser generator is located in the main body, and the laser generator generates a laser beam passing through the detection channel;

[0010] A multi-element photoelectric detector, wherein the laser beam generated by the laser emitter passes through the detection channel to detect the particle size of the powder.

[0011] The beneficial effects of the present invention are as follows: (1) the produced powder can be directly sampled through the provided sampling port, and then the particle size can be detected by generating a laser beam through a laser generator, which is very convenient and does not require separate sampling;

[0012] (2) This online laser particle size analyzer can complete online sampling and real-time online particle size monitoring in powder processing equipment, so that the production equipment is in the best working state to ensure that the particle size distribution range of the processed powder is stable and the production has the maximum output;

[0013] (3) This online laser particle size analyzer does not require too much operation by personnel, is very convenient in actual use, and is conducive to application by enterprises.

[0014] Based on the above technical solution, the present invention can also be improved as follows.

[0015] Furthermore, a light source protection glass and a detector protection glass for the laser beam to pass through are provided on the side walls of the optical space. The light source protection glass is fixedly connected to one end of the optical space close to the laser generator, and the detector protection glass is fixedly connected to one end of the optical space close to the multi-element photodetector.

[0016] The beneficial effect of adopting the above further solution is that it can ensure that the laser beam passes through the optical space while protecting the laser generator and the multi-element photoelectric detector.

[0017] Furthermore, a plurality of flow-guiding and voltage-dividing fences for dispersing powders are provided in the optical space, the plurality of flow-guiding and voltage-dividing fences are arranged in parallel, and the laser beam generated by the laser generator passes through the flow-guiding and voltage-dividing fences.

[0018] The beneficial effect of adopting the above further solution is that it can balance the air pressure difference of the test powder between the light source protection glass and the detector protection glass, so as to reduce the pollution of the light source protection glass and the detector protection glass caused by the flying test powder caused by air flow disturbance.

[0019] Furthermore, the laser generator includes a laser and a laser power controller, the laser power controller is electrically connected to the laser, and the output end of the laser faces the light source protection glass.

[0020] The beneficial effect of adopting the above further scheme is that the sampling amount of the online test can be made as wide as possible, the test powder is placed in the best shading ratio and scattering intensity range, and the test accuracy and repeatability of the instrument are the best, so as to better detect the particle size distribution of the powder.

[0021] Furthermore, a clean air inlet communicating with the optical space is provided on the side wall of the main body, and the clean air inlet is provided with a filter component for filtering air.

[0022] The beneficial effect of adopting the above further solution is that it is conducive to the dispersion of powder.

[0023] Furthermore, the filter component includes an air filter and a filter element, the filter element is arranged in the air filter, one end of the air filter is provided with an air inlet, and the other end is provided with a clean air outlet, and the clean air outlet is communicated with the clean air inlet.

[0024] The beneficial effect of adopting the above further solution is to prevent particles carried in the air from affecting the detection results.

[0025] Furthermore, a negative pressure sampling component is provided between the other end of the powder spraying tube and the sampling port, the input end of the negative pressure sampling component is connected to the sampling port, and the output end is connected to the other end of the powder spraying tube.

[0026] The beneficial effect of adopting the above further scheme is that the produced powder can be extracted and transported to the powder spraying pipe, and the powder can be transported to the optical space for detection, so that online detection can be realized very conveniently, and the detection is more convenient.

[0027] Furthermore, the negative pressure sampling component includes a high-pressure gas inlet pipe, a sampling disperser for dispersing powder, and a sampling back-blowing device. One end of the high-pressure gas inlet pipe is connected to the power end of the sampling disperser through a sampling gas valve, the output end of the sampling disperser is connected to the other end of the powder spraying pipe, the power end of the sampling back-blowing device is connected to one end of the high-pressure gas inlet pipe through a sampling back-blowing gas valve, the input end of the sampling back-blowing device is connected to the sampling port, the output end of the sampling back-blowing device is connected to the input end of the sampling disperser, and a sampling regulating valve for adjusting the negative suction pressure is also provided between the output end of the sampling back-blowing device and the input end of the sampling disperser.

[0028] The beneficial effect of adopting the above further solution is that it can facilitate multiple sampling and testing.

[0029] Furthermore, it also includes an auxiliary negative pressure vacuum pump for cleaning the optical space. One side of the main body is provided with an auxiliary vacuum port connected to the optical space, and the input end of the auxiliary negative pressure vacuum pump is connected to the auxiliary vacuum port.

[0030] The beneficial effect of adopting the above further solution is that the powder in the optical space can be extracted to facilitate the next detection.

[0031] Furthermore, it also includes a controller and a computer, wherein the controller is electrically connected to the computer, and the controller is electrically connected to the laser generator and the multi-element photoelectric detector.

[0032] The beneficial effect of adopting the above further solution is that automatic control can be performed. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of the present invention.

[0034] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0035] 1. Powder production pipe; 2. Waste gas recycle port; 4. Sampling back-blowing air valve; 5. Sampling port; 7. Sampling back-blowing device; 8. Sampling regulating valve; 9. Sampling disperser; 10. Sampling air valve; 11. Powder spraying pipe; 12. Clean air inlet; 13. Multi-element photoelectric detector; 14. Detector protection glass; 15. Diversion and pressure-dividing fence; 16. Powder sample; 17. Light source protection glass; 18. Laser power controller; 19. Laser beam; 20. Laser; 21. Main body; 22. Optical space; 23. Auxiliary air extraction port; 24. Waste powder extraction pipe; 25. Auxiliary negative pressure vacuum pump; 26. Controller; 27. Computer; 28. Control signal; 29. ​​Communication signal; 30. Clean air outlet; 31. Air filter; 32. Filter element; 33. Air inlet; 34. Air extraction control valve. DETAILED DESCRIPTION

[0036] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0037] Example

[0038] like Figure 1 As shown, this embodiment provides an online laser particle size analyzer, including: a main body 21, a powder spraying pipe 11, a waste powder extraction pipe 24, a laser generator and a multi-element photoelectric detector 13.

[0039] An optical space 22 for detecting powder is provided in the main body 21. One end of the powder spraying tube 11 penetrates into the main body 21 and is located in the optical space 22 for discharging powder. The other end of the powder spraying tube 11 is provided with a sampling port 5 for extracting powder. One end of the waste powder extraction tube 24 penetrates into the main body 21 and is located in the optical space 22 for collecting waste powder. One end of the waste powder extraction tube 24 is arranged opposite to one end of the powder spraying tube 11 and a detection channel is left. The laser generator is located in the main body 21, and the laser generator generates a laser beam 19 that passes through the detection channel. The laser beam 19 generated by the laser emitter passes through the detection channel to detect the particle size of the powder.

[0040] The main body 21 is used to detect the powder, wherein two partitions are arranged in the main body 21, and the space formed between the two partitions is the optical space 22. The optical space 22 is used for the dispersion of the powder, thereby changing the refractive index of the laser, so as to detect the particle size of the powder. The powder spraying tube 11 is used to transport the powder into the optical space 22, so that the powder is sprayed from the detection channel into the optical space 22 and is in a dispersed state. One end of the waste powder extraction tube 24 is used to discharge the powder at the detection channel and return it to the powder production tube 1. The sampling port 5 provided at the other end of the powder spraying tube 11 can take out the powder on the production line. In actual application, the sampling port 5 is connected to the product delivery pipe, and the other end of the waste powder extraction tube 24 is also connected to the product delivery pipe, so that the waste powder can return to the product delivery pipe. Among them, the laser generator is used to generate a laser beam 19, so that the laser beam 19 passes through the detection channel. The powder density at the detection channel is high and the detection accuracy is high. After the laser beam 19 passes through the powder, it is irradiated on the powder. The light scattered by the powder sample 16 is irradiated on the multi-element photodetector 13 through the powder scattering. The direct light not scattered by the powder sample 16 passes through the central hole of the multi-element photodetector 13. The laser beam 19 is detected by the multi-element photodetector 13, so as to determine the particle size and distribution of the powder. Among them, the multi-element photodetector 13 is a prior art, and it will not be described in detail.

[0041] The beneficial effect of the technical solution of this embodiment is that the produced powder can be directly sampled through the set sampling port 5, and then the particle size is detected by the laser generator to generate a laser beam 19, which is very convenient and does not require separate sampling. This online laser particle size analyzer can complete online sampling and online particle size real-time monitoring in powder processing equipment, so that the production equipment is in the best working state to ensure that the particle size distribution range of the processed powder is stable and has the maximum output production. This online laser particle size analyzer does not require too much personnel operation, is very convenient in actual use, and is conducive to enterprise application.

[0042] Preferably, in this embodiment, a light source protection glass 17 and a detector protection glass 14 for the laser beam 19 to pass through are provided on the side walls of the optical space 22. The light source protection glass 17 is fixedly connected to one end of the optical space 22 close to the laser generator, and the detector protection glass 14 is fixedly connected to one end of the optical space 22 close to the multi-element photodetector 13.

[0043] Among them, the light source protection glass 17 and the detector protection glass 14 are provided to facilitate the laser beam 19 to pass through the optical space 22, thereby realizing the detection of powder. The light source protection glass 17 is used to protect the laser generator to prevent the powder from entering the laser generator. The detector protection glass 14 is used to protect the multi-element photoelectric detector 13 to prevent the powder from entering the multi-element photoelectric detector 13 and affecting the detection accuracy.

[0044] Preferably, in this embodiment, a plurality of diverter and pressure divider fences 15 for dispersing powder are provided in the optical space 22, and the plurality of diverter and pressure divider fences 15 are arranged in parallel, and the laser beam generated by the laser generator passes through the diverter and pressure divider fences 15. The diverter and pressure divider fences 15 can be provided to balance the pressure difference of the test powder between the light source protection glass 17 and the detector protection glass 14, so as to reduce the pollution of the light source protection glass 17 and the detector protection glass 14 caused by the flying of the test powder due to air flow disturbance.

[0045] Among them, a plurality of diverter and pressure divider fences 15 are provided with a central hole for the laser beam 19 to pass through, so that the laser beam 19 passes through the central hole and scatters forward, and a plurality of small holes are distributed on the plurality of diverter and pressure divider fences 15 as channels for the airflow on two adjacent diverter and pressure divider fences 15. In this way, the air pressure of the space between two adjacent diverter and pressure divider fences 15 can be approximated, so that it can be regarded as an isobaric body, so that the protective gas flow field is stable and the powder flying caused by the disturbance of the protective gas is reduced.

[0046] Preferably, in this embodiment, the laser generator includes a laser 20 and a laser power controller 18, the laser power controller 18 is electrically connected to the laser 20, and the output end of the laser 20 faces the light source protection glass 17. The laser 20 is used to generate a laser beam 19. The laser power controller 18 is used to control the power of the laser 20, thereby controlling the strength of the generated laser beam 19, so that the sampling amount of the online test can be as wide as possible, so that the test powder is in the best shading ratio and scattering intensity range, so that the test accuracy and repeatability of the instrument are the best, so as to better detect the particle size distribution of the powder. The laser beam 19 generated by the laser 20 is irradiated on the light source protection glass 17, and passes through the light source protection glass 17 into the optical space 22.

[0047] Preferably, in this embodiment, a clean air inlet 12 connected to the optical space 22 is provided on the side wall of the main body 21, and a filter component for filtering air is provided at the clean air inlet 12. The filter component can filter the air to form clean air, which then enters the optical space 22 from the clean air inlet 12, so that the powder can be in a dispersed state.

[0048] Preferably, in this embodiment, the filtering component includes an air filter 31 and a filter element 32, the filter element 32 is arranged in the air filter 31, one end of the air filter 31 is provided with an air inlet 33, and the other end is provided with a clean air outlet 30, and the clean air outlet 30 is connected to the clean air inlet 12.

[0049] The air filter 31 is hollow inside, and the filter element 32 is installed in the air filter 31. A mounting port is provided on one side of the air filter 31, so that the filter element 32 can be replaced. External air enters the air filter 31 from the air inlet 33, and then passes through the filter element 32 to filter the air. The filtered clean air is discharged from the clean air outlet 30 and enters the optical space 22 through the clean air inlet 12. Thus, the air can be effectively filtered to prevent the particles carried in the air from affecting the detection results.

[0050] Preferably, in this embodiment, a negative pressure sampling component is provided between the other end of the powder spraying tube 11 and the sampling port 5, the input end of the negative pressure sampling component is connected to the sampling port 5, and the output end is connected to the other end of the powder spraying tube 11. The negative pressure sampling component can extract the produced powder and transport it to the powder spraying tube 11, so that the powder can be transported to the optical space 22 for detection, thereby realizing online detection very conveniently and making the detection more convenient. Among them, the sampling port 5 is placed in the powder production tube 1 and is connected to the powder production tube 1, so that the powder produced online can be sampled very conveniently.

[0051] Preferably, in this embodiment, the negative pressure sampling component includes a high-pressure gas inlet pipe, a sampling disperser 9 for dispersing powder, and a sampling back-blow device 7. One end of the high-pressure gas inlet pipe is connected to the power end of the sampling disperser 9 through a sampling gas valve 10, and the output end of the sampling disperser 9 is connected to the other end of the powder spraying pipe 11. The power end of the sampling back-blow device 7 is connected to one end of the high-pressure gas inlet pipe through a sampling back-blow gas valve 4. The input end of the sampling back-blow device 7 is connected to the sampling port 5, and the output end of the sampling back-blow device 7 is connected to the input end of the sampling disperser 9. A sampling regulating valve 8 for adjusting the negative suction pressure is also provided between the output end of the sampling back-blow device 7 and the input end of the sampling disperser 9.

[0052] The high-pressure gas inlet pipe is used to blow in high-pressure gas. By opening the sampling gas valve 10, the high-pressure gas in the high-pressure gas inlet pipe enters the sampling disperser 9, so that the sampling disperser 9 generates negative pressure. Since the sampling disperser 9 is connected to the sampling backblower 7, negative pressure is also formed in the sampling backblower 7, so that the sampling port 5 is negatively pressurized, and the powder transported in the powder production pipe 1 is extracted. The powder enters the sampling backblower 7, and then flows to the sampling disperser 9. After being dispersed by the sampling disperser 9, it is transported to the powder spraying pipe 11. The sampling backblower 7 uses backblowing air to enable batch sampling to avoid the influence between the powders in each batch.

[0053] The connection and disconnection between the high-pressure gas inlet pipe and the sampling back-blowing device 7 is controlled by the sampling back-blowing valve 4. When the sampling back-blowing valve 4 is opened, the high-pressure gas in the high-pressure gas inlet pipe enters the sampling back-blowing device 7, and the powder medicine remaining in the sampling back-blowing device 7 is blown back into the powder production pipe 1, so as to facilitate the next sampling. When sampling, the sampling back-blowing valve 4 is closed.

[0054] The sampling regulating valve 8 can adjust the negative pressure generated by the sampling disperser 9 and the degree of sampling. Preferably, according to the needs of the production process, multiple sampling regulating valves 8 can be set, and multiple sampling regulating valves 8 are set in parallel. The sampling negative pressure is adjusted by changing the opening or closing of multiple sampling regulating valves 8. Multiple sampling regulating valves 8 can be opened and closed individually, or opened and closed at the same time to achieve multi-speed adjustment to ensure the optimal scattering concentration and shading ratio of the particle size test.

[0055] Preferably, in this embodiment, an auxiliary negative pressure suction pump 25 for cleaning the optical space 22 is also included. One side of the main body 21 is provided with an auxiliary suction port 23 connected to the optical space 22, and the input end of the auxiliary negative pressure suction pump 25 is connected to the auxiliary suction port 23. The auxiliary negative pressure suction pump 25 can be used to extract the powder in the optical space 22, so as to facilitate the next detection. The optical space 22 can be evacuated by the auxiliary negative pressure suction pump 25. The auxiliary negative pressure suction pump 25 is a prior art, and its structure will not be described in detail here.

[0056] Preferably, in this embodiment, the other end of the waste powder extraction pipe 24 is connected to the powder production pipe 1 through an exhaust control valve 34, wherein the powder production pipe 1 is provided with a waste gas recovery port 2, and the exhaust control valve 34 is connected to the waste gas recovery port 2. The connection or disconnection of the waste powder extraction pipe 24 and the waste gas recovery port 2 can be achieved by opening or closing the exhaust control valve 34.

[0057] Preferably, in this embodiment, a controller 26 and a computer 27 are further included, wherein the controller 26 is electrically connected to the computer 27, and the controller 26 is electrically connected to the laser generator and the multi-element photoelectric detector 13. Among them, the sampling gas valve 10, the sampling regulating valve 8, the sampling back-blowing gas valve 4 and the air extraction control valve 34 are electromagnetic valves, and are electrically connected to the controller 26, and the opening or closing of the sampling gas valve, the sampling regulating valve 8, the sampling back-blowing gas valve 4 and the air extraction control valve 34 can be controlled by the controller 26. The controller 26 is also electrically connected to the auxiliary negative pressure air extraction pump 25, and can control the opening or closing of the auxiliary negative pressure air extraction pump 25.

[0058] The working principle of this online laser particle size analyzer is that the powder processed by the pulverizer is output through the powder production tube 1 and is sucked into the product collection device by the exhaust system. The powder in the powder production tube 1 is the product required for production. The online laser particle size analyzer is used to test the particle size of the powder in this tube.

[0059] During the online test, when the sampling gas valve 10 is opened, the high-pressure gas enters the sampling disperser 9, and generates negative pressure suction under the action of the Venturi effect. The powder in the powder production pipe 1 passes through the sampling port 5, and then passes through the sampling backblower 7, enters the sampling disperser 9, and then enters the powder spraying pipe 11 for dispersion and mixing, and then sprays out from the gap and disperses in the optical space 22, completing the sampling, dispersion and transportation of the sample. The scattered light generated by the laser beam 19 generated by the laser 20 irradiating the test powder is placed on the forward multi-element photoelectric detector 13, collected and converted into an electrical signal. After being processed by the controller 26, it is input into the computer 27, and the sample particle size distribution is calculated. The tested test powder is returned to the powder production pipe 1 for recovery through the waste powder extraction pipe 24, the exhaust control valve 34 and the waste gas re-extraction port 2. After the test is completed, the actions related to the test are closed one after another. The negative pressure generated by the exhaust control valve 34 in the optical space 22 disappears. At this time, the negative pressure of the optical space 22 is maintained by the auxiliary negative pressure vacuum pump 25 through the auxiliary vacuum port 23, ensuring the stability of the protective gas flow field in the optical space 22 and reducing the pollution to the protective glass. The powder in the optical space 22 is completely extracted by the auxiliary negative pressure vacuum pump 25 to facilitate the next detection.

[0060] In order to meet the largest possible changes in product output, the power of the laser 20 can be controlled by the laser power controller 18 to make the test powder at the best shading ratio and scattering intensity to achieve the best test accuracy and repeatability.

[0061] The online test interval can be set according to the production process parameters, and the test results are displayed and saved in real time as data and curves. The data can be directly used as real-time particle size monitoring.

[0062] In addition, the particle size data can be based on the process requirements of online control, using corresponding algorithms, and exchanging information with on-site production equipment through control signals to achieve open-loop or closed-loop automatic control, ensuring the particle size of the processed powder is stable, improving product quality, and saving labor.

[0063] In the description of the present invention, it is necessary to understand that the terms "center", "length", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "inside", "outside", "peripheral", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0064] In the description of the present invention, “plurality” means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0065] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0066] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An online laser particle size analyzer, characterized in that: include: A main body (21), wherein an optical space (22) for detecting powder is provided in the main body (21); A powder spraying tube (11), one end of the powder spraying tube (11) penetrates the main body (21) and is located in the optical space (22) for discharging powder, and the other end of the powder spraying tube (11) is provided with a sampling port (5) for extracting powder; a waste powder extraction pipe (24), one end of the waste powder extraction pipe (24) passing through the main body (21) and being located in the optical space (22) for collecting waste powder, one end of the waste powder extraction pipe (24) being arranged opposite to one end of the powder spraying pipe (11) and leaving a detection channel; a laser generator, the laser generator being located in the main body (21), the laser generator generating a laser beam (19) passing through the detection channel; A multi-element photoelectric detector (13), wherein the laser beam (19) generated by the laser generator passes through the detection channel to detect the particle size of the powder; A light source protection glass (17) and a detector protection glass (14) for the laser beam (19) to pass through are provided on the side wall of the optical space (22); the light source protection glass (17) is fixedly connected to one end of the optical space (22) close to the laser generator, and the detector protection glass (14) is fixedly connected to one end of the optical space (22) close to the multi-element photoelectric detector (13); A clean air inlet (12) communicating with the optical space (22) is provided on the side wall of the main body (21), and the clean air inlet (12) is provided with a filter component for filtering air.

2. The online laser particle size analyzer according to claim 1, characterized in that: A plurality of flow-guiding and voltage-dividing fences (15) for dispersing powder are provided in the optical space (22); the plurality of flow-guiding and voltage-dividing fences (15) are arranged in parallel, and the laser beam generated by the laser generator passes through the flow-guiding and voltage-dividing fences (15).

3. The online laser particle size analyzer according to claim 2, characterized in that: The laser generator comprises a laser (20) and a laser power controller (18); the laser power controller (18) is electrically connected to the laser (20); and an output end of the laser (20) faces the light source protection glass (17).

4. The online laser particle size analyzer according to claim 1, characterized in that: The filter component comprises an air filter (31) and a filter element (32); the filter element (32) is arranged in the air filter (31); one end of the air filter (31) is provided with an air inlet (33); the other end of the air filter (31) is provided with a clean air outlet (30); the clean air outlet (30) is communicated with the clean air inlet (12).

5. The online laser particle size analyzer according to claim 1, characterized in that: A negative pressure sampling component is provided between the other end of the powder spraying tube (11) and the sampling port (5); the input end of the negative pressure sampling component is connected to the sampling port (5), and the output end is connected to the other end of the powder spraying tube (11).

6. The online laser particle size analyzer according to claim 5, characterized in that: The negative pressure sampling component comprises a high-pressure gas inlet pipe, a sampling disperser (9) for dispersing powder, and a sampling back-blowing device (7); one end of the high-pressure gas inlet pipe is connected to the power end of the sampling disperser (9) through a sampling gas valve (10); the output end of the sampling disperser (9) is connected to the other end of the powder spraying pipe (11); the power end of the sampling back-blowing device (7) is connected to one end of the high-pressure gas inlet pipe through a sampling back-blowing gas valve (4); the input end of the sampling back-blowing device (7) is connected to the sampling port (5); the output end of the sampling back-blowing device (7) is connected to the input end of the sampling disperser (9); and a sampling regulating valve (8) for adjusting the negative suction pressure is provided between the output end of the sampling back-blowing device (7) and the input end of the sampling disperser (9).

7. The online laser particle size analyzer according to claim 1, characterized in that: It also includes an auxiliary negative pressure suction pump (25) for cleaning the optical space (22); one side of the main body (21) is provided with an auxiliary suction port (23) connected to the optical space (22); and an input end of the auxiliary negative pressure suction pump (25) is connected to the auxiliary suction port (23).

8. The online laser particle size analyzer according to any one of claims 1 to 7, characterized in that: It also includes a controller (26) and a computer (27), wherein the controller (26) is electrically connected to the computer (27), and the controller (26) is electrically connected to the laser generator and the multi-element photodetector (13).

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