Laser particle size analyzer with dual ultrasonic structure

Abstract

The present invention relates to the technical field of laser particle size analyzers, and in particular to a laser particle size analyzer with a dual ultrasonic structure, comprising a particle size analyzer body, a sample pool disposed on the particle size analyzer body, a sample dispersion mechanism disposed within the sample pool for breaking up particle agglomerates, a stirring auxiliary mechanism disposed above the sample pool for preventing suspended particles from settling, the stirring auxiliary mechanism capable of pushing particles toward the acoustic field intensity zone of the sample dispersion mechanism to improve dispersion efficiency, and a splash-proof covering mechanism disposed at the upper end of the sample pool. By providing a sample dispersion mechanism and employing a combination of phase orthogonal and material orthogonal layouts, the present invention can form a stable three-dimensional acoustic vortex within the sample pool, significantly improving the coverage of the ultrasonic cavitation effect, thereby improving the uniformity of particle dispersion. Furthermore, a detachable low-frequency ultrasonic vibrator is employed at the bottom to further enhance the penetration of high-concentration, high-viscosity samples, effectively eliminating dispersion dead angles.

Description

Technical Field

[0001] The invention relates to the technical field of laser particle size analyzers, in particular to a laser particle size analyzer with a dual ultrasonic wave structure. Background Art

[0002] The laser particle size analyzer is a precision instrument that analyzes the particle size distribution by measuring the scattering characteristics of particles to laser light. Its core structure can be divided into six modules: laser emission system, sample dispersion system, optical detection system, signal acquisition system, data acquisition system and mechanical structure system. Among them, the sample dispersion system is the core module that ensures that particles pass through the detection area in a monodisperse state.

[0003] The ultrasonic dispersion systems of existing laser particle size analyzers mostly use single-frequency ultrasonic vibrators, which result in uneven sound field distribution and the presence of dispersion dead spots. Moreover, the mechanical stirring structure used to assist dispersion often generates excessive shear force, which can easily cause particle breakage and seriously affect measurement accuracy. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides a laser particle size analyzer with a dual ultrasonic structure, which solves the technical problems of uneven sound field distribution and easy dispersion dead corners in the dispersion system of the laser particle size analyzer in the existing technology. It has the advantages of effectively improving the uniformity of particle dispersion and eliminating dispersion dead corners.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a laser particle size analyzer with a dual ultrasonic structure, comprising a particle size analyzer body, a sample pool is provided on the particle size analyzer body, a sample dispersion mechanism for breaking up particle agglomerates is provided inside the sample pool, a stirring auxiliary mechanism for preventing suspended particles from settling is provided above the sample pool, the stirring auxiliary mechanism can push the particles to the sound field intensity zone of the sample dispersion mechanism to improve the dispersion efficiency, laser measuring mechanisms are provided on two symmetrical sides of the sample pool, the laser measuring mechanism can avoid the stirring auxiliary mechanism by changing the incident angle, and a splash-proof covering mechanism is provided on the upper end of the sample pool. After the liquid to be measured enters the sample pool, the sample dispersion mechanism and the stirring auxiliary mechanism will automatically perform dual ultrasonic dispersion treatment on the liquid to be measured, and the separation During the dispersion process, the splash-proof covering mechanism will cover the upper end of the sample pool to prevent liquid splashing. After the dispersion is completed, the laser measurement mechanism will use the scattering characteristics of the laser to accurately measure the particle size distribution of particles in the solution. The sample dispersion mechanism includes an octagonal columnar cavity opened inside the sample pool. The four symmetrical side walls of the octagonal columnar cavity are respectively embedded with piezoelectric ceramic pieces. A mounting screw hole is opened at the bottom of the sample pool, and a threaded sealing block is movably installed on the mounting screw hole. The threaded sealing block is integrated with a bottom ultrasonic vibrator. A three-blade propeller is provided inside the octagonal columnar cavity. The operating frequency of the bottom ultrasonic vibrator is lower than that of the piezoelectric ceramic piece. When in use, you can flexibly choose whether to activate the bottom ultrasonic vibrator according to the type of liquid sample.

[0006] Preferably, the stirring auxiliary mechanism includes a mounting bracket, which is fixedly mounted on the particle size analyzer body, and a motor assembly is rotatably connected to the mounting bracket. The output end of the motor assembly is transmission-connected to a telescopic round rod, and the telescopic round rod is fixedly connected to the three-blade propeller. A driving shaft is provided between the motor assembly and the mounting bracket, and the rotation of the driving shaft will change the pitch angle of the motor assembly. An observation window is provided on one side of the sample pool. After the liquid to be tested is poured into the sample pool, the staff can determine the liquid level inside the sample pool through the observation window. Next, the staff will control the extension or contraction of the telescopic round rod to ensure that the height of the three-blade propeller is at one-half of the effective liquid depth.

[0007] Preferably, the phase difference of the driving signals of adjacent piezoelectric ceramic sheets is ninety degrees, and the angle between adjacent piezoelectric ceramic sheets is ninety degrees. By combining this physical orthogonality and phase orthogonality, a stable acoustic vortex can be formed inside the sample pool, which can significantly improve the uniformity of particle dispersion.

[0008] Preferably, the pitch angle of the three-blade propeller is thirty degrees, and the diameter of the three-blade propeller is less than one-third of the diameter of the inscribed circle of the sample pool. The use of a pitch angle of thirty degrees can produce a mixed flow of axial flow and radial flow, which can prevent particles from settling at the bottom of the pool to a certain extent.

[0009] Preferably, micropores are provided on the surface of the three-blade propeller. The micropores on the surface can effectively reduce sound reflection and reduce the impact on the ultrasonic dispersion process.

[0010] Preferably, the laser measurement mechanism includes a laser incident window and a laser receiving window, which are respectively opened on two symmetrical sides of the sample cell. A quartz-graphene composite window is provided inside the laser incident window, and a sapphire-nanocoating window is provided inside the laser receiving window. After the laser beam enters through the laser incident window, it will be emitted through the laser receiving window.

[0011] Preferably, the quartz-graphene composite window is tilted at 45°, and the sapphire-nanocoating window is a wedge-shaped optical window, which can allow the laser to pass through the sample cell at a forty-five-degree angle. The wedge-shaped optical window design can effectively compensate for refraction offset.

[0012] Preferably, the splash-proof covering mechanism includes a top cover plate detachably mounted on the upper end of the sample pool, a rubber mounting seat is provided on the top cover plate, a bearing assembly is provided on the rubber mounting seat, the bearing assembly is slidably connected to the telescopic round rod, initially, the rubber mounting seat is in a horizontal state, and the telescopic round rod passes through the rubber mounting seat and extends into the interior of the sample pool.

[0013] Preferably, a feeding channel is provided on the top cover plate, and a number of independent rubber baffles are fixedly installed inside the feeding channel. When the staff uses a dropper to add samples, the rubber baffles will release the obstruction of the feeding channel. After the addition is completed, the rubber baffles will resume the obstruction of the feeding channel in a short time.

[0014] By means of the above technical solution, the present invention provides a laser particle size analyzer with a dual ultrasonic structure, which has at least the following beneficial effects:

[0015] 1. The present invention sets up a sample dispersion mechanism and adopts a combination of phase orthogonal and material orthogonal layout to form a stable three-dimensional acoustic vortex inside the sample pool, which can significantly improve the coverage of the ultrasonic cavitation effect, thereby improving the uniformity of particle dispersion. In addition, the detachable low-frequency ultrasonic vibrator at the bottom further enhances the penetration of high-concentration and high-viscosity samples, which can effectively eliminate dispersion dead angles.

[0016] 2. The present invention sets a sample dispersion mechanism. The three-blade propeller adopts a 30-degree pitch angle design, which can generate a mixed flow of axial flow and radial flow when rotating. It can effectively balance the requirements of particle suspension and anti-sedimentation, avoid the dead zone of the flow field caused by traditional stirring, and the micropores opened on the surface of the three-blade propeller can effectively reflect sound, so that the sound-flow synergy efficiency is effectively improved, which is suitable for widely distributed samples.

[0017] 3. The present invention provides a sample dispersion mechanism, and the bottom ultrasonic vibrator is movably installed through a threaded sealing block. It can be flexibly activated or disassembled according to the sample characteristics (such as viscosity and density), taking into account the needs of conventional measurements and extreme working conditions. In addition, the diameter of the three-blade propeller is limited to less than one-third of the inscribed circle of the sample pool, which can effectively ensure that there is no interference with the ultrasonic field.

[0018] 4. The present invention provides a stirring auxiliary mechanism. Through the coordinated design of the observation window and the telescopic round rod, the staff can adjust the height of the three-blade propeller to one-third to one-half of the effective liquid depth in real time, thereby ensuring particle suspension and flow field uniformity, reducing bottom sedimentation and avoiding bubble interference introduced by liquid surface vortexes.

[0019] 5. The present invention realizes dynamic optimization of the three-dimensional flow field by setting a stirring auxiliary mechanism, combining the pitch angle adjustment function of the motor assembly with the vertical displacement control of the telescopic rod. The axial thrust generated by the inclined stirring forms a synergistic vortex with the ultrasonic standing wave field, which extends the circulation path of the particles in the sample pool, and is particularly suitable for high-viscosity fluids.

[0020] 6. The present invention provides a splash-proof covering mechanism. Through the elastic matching design of the top cover and the rubber mounting seat, the deformation compensation capability of the rubber mounting seat can effectively eliminate mechanical interference. While ensuring that the sample pool is fully enclosed and splash-proof, it can allow the telescopic round rod to move freely within the angle adjustment range of ±15°, so that the three-blade propeller can still maintain sealing when working at an angle.

[0021] 7. The present invention realizes an intelligent seal of "self-opening when adding and instant closing after completion" by setting up a splash-proof covering mechanism and utilizing the mutual cooperation between the feeding channel and the rubber baffle. It can avoid the aerosol escape caused by ultrasonic cavitation to a certain extent and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0023] Figure 1 A three-dimensional diagram of the overall structure of the present invention;

[0024] Figure 2 Schematic diagram of the structure of the sample cell in the present invention;

[0025] Figure 3 Schematic diagram of the structure of the threaded sealing block in the present invention;

[0026] Figure 4 Schematic diagram of the structure of the stirring auxiliary mechanism of the present invention;

[0027] Figure 5 Schematic diagram of the structure of the telescopic round rod in the present invention;

[0028] Figure 6 Schematic diagram of the structure of the observation window in the present invention;

[0029] Figure 7 It is a structural schematic diagram of the laser measurement mechanism in the present invention;

[0030] Figure 8 Schematic diagram of the structure of the splash-proof covering mechanism of the present invention;

[0031] Figure 9 It is a structural schematic diagram of the top cover plate in the present invention.

[0032] In the figure: 1. Particle size analyzer body; 2. Sample cell; 3. Sample dispersion mechanism; 301. Octagonal columnar cavity; 302. Piezoelectric ceramic piece; 303. Bottom ultrasonic vibrator; 304. Threaded sealing block; 305. Three-blade propeller; 4. Stirring auxiliary mechanism; 401. Mounting bracket; 402. Motor assembly; 403. Telescopic round rod; 404. Drive shaft; 405. Observation window; 5. Laser measurement mechanism; 501. Laser incident window; 502. Laser receiving window; 503. Quartz-graphene composite window; 504. Sapphire-nanocoating window; 6. Splash-proof cover mechanism; 601. Top cover; 602. Rubber mounting seat; 603. Bearing assembly; 604. Feeding channel; 605. Rubber baffle. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] Example 1

[0035] The ultrasonic dispersion system of the laser particle size analyzer in the prior art mostly uses a single-frequency ultrasonic vibrator, which has an uneven sound field distribution and a dispersion dead zone. In addition, the mechanical stirring structure used to assist the dispersion often generates excessive shear force, which easily causes particle breakage and seriously affects the accuracy of the measurement. In order to solve this technical defect in the prior art, Figure 1-Figure 5 As shown, this embodiment proposes a laser particle size analyzer with a dual ultrasonic structure, which can form a stable three-dimensional acoustic vortex inside the sample cell 2, which can significantly improve the coverage of the ultrasonic cavitation effect. The particle size analyzer body 1 is provided with a sample cell 2, and a sample dispersion mechanism 3 for breaking up particle agglomerates is provided inside the sample cell 2. A stirring auxiliary mechanism 4 is provided above the sample cell 2 to prevent the suspended particles from settling. The stirring auxiliary mechanism 4 can push the particles to the sound field intensity area of the sample dispersion mechanism 3 to improve the dispersion efficiency. Laser measurement mechanisms 5 are provided on two symmetrical sides of the sample cell 2. The laser measurement mechanism 5 can avoid the stirring auxiliary mechanism 4 by changing the incident angle. A splash-proof covering mechanism 6 is provided at the upper end of the sample cell 2. After the liquid to be tested enters the sample cell 2, the sample dispersion mechanism 3 and the stirring auxiliary mechanism 4 will automatically perform dual ultrasonic dispersion treatment on the liquid to be tested. During the dispersion process, the splash-proof covering mechanism 6 will shield the upper end of the sample cell 2 to prevent liquid splashing. After the dispersion is completed, the laser measurement mechanism 5 will use the scattering characteristics of the laser to accurately measure the particle size distribution of the particles in the solution.

[0036] Specifically, the sample dispersion mechanism 3 includes an octagonal columnar cavity 301 opened inside the sample pool 2, and the four symmetrical side walls of the octagonal columnar cavity 301 are respectively embedded with piezoelectric ceramic pieces 302. The phase difference of the driving signals of adjacent piezoelectric ceramic pieces 302 is ninety degrees, and the angle between adjacent piezoelectric ceramic pieces 302 is ninety degrees. Through this combination of physical orthogonality and phase orthogonality, a stable acoustic vortex can be formed inside the sample pool 2, which can significantly improve the uniformity of particle dispersion. A mounting screw hole is provided at the bottom of the sample pool 2, and a threaded sealing block 304 is movably installed on the mounting screw hole. The threaded sealing block 304 is integrated with a bottom ultrasonic vibrator 303. A three-blade propeller 305 is provided inside the cavity 301. The operating frequency of the bottom ultrasonic vibrator 303 is 5-10kHz lower than the operating frequency of the piezoelectric ceramic piece 302. When in use, the activation of the bottom ultrasonic vibrator 303 can be flexibly selected according to the type of liquid sample. The pitch angle of the three-blade propeller 305 is thirty degrees. The diameter of the three-blade propeller 305 is less than one-third of the diameter of the inscribed circle of the sample pool 2. The use of a pitch angle of thirty degrees can generate a mixed flow of axial flow and radial flow, which can prevent particles from settling at the bottom of the pool to a certain extent. Micropores are opened on the surface of the three-blade propeller 305. The micropores opened on the surface can effectively reduce sound reflection and reduce the impact on the ultrasonic dispersion process.

[0037] According to the above content, when performing sample particle size analysis and measurement, the staff will first pour the liquid to be tested into the interior of the sample cell 2. Subsequently, the piezoelectric ceramic piece 302 installed on the side wall of the octagonal columnar cavity 301 will form a stable acoustic vortex inside the sample cell 2, thereby fully cavitating and dispersing the sample solution. At this time, only the piezoelectric ceramic piece 302 on the side wall needs to work.

[0038] If the sample solution is a high-concentration, high-viscosity sample, the staff will manually activate the bottom ultrasonic vibrator 303 installed on the threaded sealing block 304, which can effectively enhance the penetration power, prevent sedimentation and hardening, and effectively ensure the dispersion effect.

[0039] In addition, during the cavitation dispersion process, the three-blade propeller 305 rotates at a predetermined speed driven by the motor assembly 402, and a mixed flow of axial flow and radial flow can be generated inside the sample pool 2 during rotation, which can also prevent particles from settling at the bottom of the pool.

[0040] In this embodiment, by setting up a sample dispersion mechanism 3 and combining phase orthogonal and material orthogonal layout, a stable three-dimensional acoustic vortex can be formed inside the sample pool 2, which can significantly improve the coverage of the ultrasonic cavitation effect, thereby improving the uniformity of particle dispersion. In addition, a detachable low-frequency ultrasonic vibrator is used at the bottom to further enhance the penetration of high-concentration and high-viscosity samples, which can effectively eliminate dispersion dead angles. Moreover, in this embodiment, by setting up a sample dispersion mechanism 3, the three-blade propeller 305 adopts a 30-degree pitch angle design, which can generate a mixed flow of axial flow and radial flow when rotating, which can effectively balance the particles. The suspension and anti-sedimentation requirements are met, and the dead zone of the flow field caused by traditional stirring is avoided. Moreover, the micropores opened on the surface of the three-blade propeller 305 can effectively reflect sound, so that the sound-flow synergy efficiency is effectively improved, and it is suitable for widely distributed samples. In addition, this embodiment provides a sample dispersion mechanism 3, and the bottom ultrasonic vibrator 303 is movably installed through the threaded sealing block 304, which can be flexibly activated or disassembled according to the sample characteristics (such as viscosity and density), taking into account the needs of conventional measurement and extreme working conditions. Moreover, the diameter of the three-blade propeller 305 is limited to less than one-third of the inscribed circle of the sample pool 2, which can effectively ensure that there is no interference with the ultrasonic field.

[0041] Example 2

[0042] In order to minimize the bottom sedimentation of particles and avoid the interference of bubbles, based on Example 1, Figure 1 、 Figure 5 as well as Figure 6 As shown, this embodiment is provided with a stirring auxiliary mechanism 4. Specifically, the stirring auxiliary mechanism 4 includes a mounting bracket 401, which is fixedly mounted on the particle size analyzer body 1. A motor assembly 402 is rotatably connected to the mounting bracket 401. The output end of the motor assembly 402 is transmission-connected to a telescopic round rod 403. The telescopic round rod 403 is fixedly connected to the three-blade propeller 305. A driving shaft 404 is provided between the motor assembly 402 and the mounting bracket 401. The rotation of the driving shaft 404 will change the pitch angle of the motor assembly 402. The change in the pitch angle of the motor assembly 402 will change the angle between the three-blade propeller 305 and the liquid surface. An observation window 405 is provided on one side of the sample cell 2. After the liquid to be tested is poured into the sample cell 2, the staff can determine the liquid level inside the sample cell 2 through the observation window 405. Next, the staff will control the extension or contraction of the telescopic round rod 403 to ensure that the height of the three-blade propeller 305 is located at half of the effective liquid depth.

[0043] According to the above content, after the staff pours the liquid to be tested into the sample pool 2, they will manually adjust the height of the three-blade propeller 305 through the observation window 405 and the telescopic rod 403 to ensure that the height of the three-blade propeller 305 is located at one-third to one-half of the effective liquid depth (measured from the bottom of the pool). This position can simultaneously suppress bottom sedimentation and surface vortices.

[0044] Moreover, during the stirring and dispersing process, the motor assembly 402 can rotate under the drive of the driving shaft 404. When the motor assembly 402 rotates, the three-blade propeller 305 will rotate synchronously, thereby tilting the three-blade propeller 305 by 15°, making the blades form an angle of 15° with the horizontal plane, and can push the particles to the strong sound field area, thereby further improving the dispersion effect.

[0045] In this embodiment, a stirring auxiliary mechanism 4 is provided. Through the coordinated design of the observation window 405 and the telescopic rod 403, the staff can adjust the height of the three-blade propeller 305 to one-third to one-half of the effective liquid depth in real time, thereby ensuring the suspension of particles and the uniformity of the flow field, which can not only reduce bottom sedimentation but also avoid the interference of bubbles introduced by the liquid surface vortex; moreover, in this embodiment, a stirring auxiliary mechanism 4 is provided, and the pitch angle adjustment function of the motor assembly 402 is combined with the vertical displacement control of the telescopic rod 403 to achieve dynamic optimization of the three-dimensional flow field. The axial thrust generated by the inclined stirring forms a coordinated vortex with the ultrasonic standing wave field, thereby extending the circulation path of the particles in the sample pool 2, which is particularly suitable for high-viscosity fluids.

[0046] Example 3

[0047] Based on the above embodiments, Figure 1 and Figure 7 As shown, the present embodiment is provided with a laser measuring mechanism 5. Specifically, the laser measuring mechanism 5 includes a laser incident window 501 and a laser receiving window 502. The laser incident window 501 and the laser receiving window 502 are respectively provided on two symmetrical sides of the sample cell 2. A quartz-graphene composite window 503 is provided inside the laser incident window 501. The quartz-graphene composite window 503 is tilted at 45°, so that the laser can pass through the sample cell 2 at a forty-five-degree angle. A sapphire-nano-coating window 504 is provided inside the laser receiving window 502. After the laser beam enters through the laser incident window 501, it will be emitted through the laser receiving window 502. The sapphire-nano-coating window 504 is a wedge-shaped optical window. The wedge-shaped optical window design can effectively compensate for refraction offset.

[0048] As can be seen from the above, during the detection operation, the laser beam emitted by the laser is expanded and collimated, then penetrates the quartz-graphene composite window 503 at a 45° angle and enters the sample cell 2. The laser then passes through the area with the highest energy density of the ultrasonic cavitation cloud. At this time, the particles are modulated by the 20kHz / 40kHz orthogonal ultrasonic field and are dynamically distributed. The resulting multi-angle scattered light is received by the wedge-shaped sapphire-nanocoating window 504. Next, the forward (0.5°-30 degrees), lateral (45°-90 degrees), and backward (135°-175°) scattered light are synchronously collected by the silicon photodiode array, PMT, and APD detectors, respectively. The ultrasonic perturbations are eliminated through the acoustic pressure-light intensity coupling algorithm, ultimately achieving accurate inversion of particles with a 10nm-3mm wide distribution, with a measurement repeatability error within ±1.5%. (The laser detection process is a common technical means in the prior art and will not be described in detail here. In addition, the laser, silicon photodiode array, and other detectors are all prior art and are not shown in the figure.)

[0049] Example 4

[0050] In order to prevent liquid splashing during sample dispersion, based on the above embodiment, Figure 1 、 Figure 8 as well as Figure 9 As shown, this embodiment is provided with a splash-proof covering mechanism 6. Specifically, the splash-proof covering mechanism 6 includes a top cover plate 601 detachably mounted on the upper end of the sample pool 2. A rubber mounting seat 602 is provided on the top cover plate 601. A bearing assembly 603 is provided on the rubber mounting seat 602. The bearing assembly 603 is slidingly connected to the telescopic round rod 403. Initially, the rubber mounting seat 602 is in a horizontal state, and the telescopic round rod 403 passes through the rubber mounting seat 602 and extends into the interior of the sample pool 2. A feeding channel 604 is provided on the top cover plate 601. Several independent rubber baffles 605 are fixedly installed inside the feeding channel 604. When the staff uses a dropper to add samples, the rubber baffle 605 will release the obstruction of the feeding channel 604. After the addition is completed, the rubber baffle 605 will restore the obstruction of the feeding channel 604 in a short time.

[0051] According to the above content, it can be seen that during the sample dispersion process, the top cover 601 will shield and protect the upper end of the sample pool 2, which can effectively prevent the sample solution from splashing during the dispersion process. Moreover, when the telescopic rod 403 changes its angle following the motor assembly 402, the rubber mounting seat 602 can undergo a certain deformation, thereby avoiding motion interference with the telescopic rod 403.

[0052] In this embodiment, a splash-proof covering mechanism 6 is provided, and the elastic matching design of the top cover 601 and the rubber mounting seat 602, and the deformation compensation capability of the rubber mounting seat 602 can effectively eliminate mechanical interference. While ensuring that the sample pool 2 is fully enclosed and splash-proof, the telescopic round rod 403 can be allowed to move freely within the angle adjustment range of ±15°, so that the three-blade propeller 305 can still maintain sealing when working at an angle; moreover, in this embodiment, by providing a splash-proof covering mechanism 6, the mutual cooperation between the feeding channel 604 and the rubber baffle 605 is utilized to realize an intelligent seal of "self-opening when adding and instant closing after completion", which can avoid the escape of aerosols caused by ultrasonic cavitation to a certain extent and is easy to use.

[0053] The control method of the present invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by a person skilled in the art. The provision of power is also common knowledge in the art. The present invention is mainly used to protect mechanical devices, so the control method and circuit connection are not explained in detail in the present invention.

[0054] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements that are inherent to such process, method, article or apparatus.

[0055] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A laser particle size analyzer with a dual ultrasonic structure, comprising a particle size analyzer body (1), a sample pool (2) being provided on the particle size analyzer body (1), and characterized in that: The sample pool (2) is provided with a sample dispersion mechanism (3) for breaking up particle agglomerates, and a stirring auxiliary mechanism (4) is provided above the sample pool (2) for preventing suspended particles from settling. The stirring auxiliary mechanism (4) can push particles toward the sound field intensity area of the sample dispersion mechanism (3) to improve dispersion efficiency. Two symmetrical sides of the sample pool (2) are provided with laser measurement mechanisms (5). The laser measurement mechanism (5) can avoid the stirring auxiliary mechanism (4) by changing the incident angle. The upper end of the sample pool (2) is provided with a splash-proof covering mechanism (6); The sample dispersion mechanism (3) comprises an octagonal columnar cavity (301) provided inside the sample pool (2), piezoelectric ceramic pieces (302) being embedded and mounted on four symmetrical side walls of the octagonal columnar cavity (301), a mounting screw hole being provided at the bottom of the sample pool (2), a threaded sealing block (304) being movably mounted on the mounting screw hole, a bottom ultrasonic vibrator (303) being integrated on the threaded sealing block (304), and a three-blade propeller (305) being provided inside the octagonal columnar cavity (301).

2. The laser particle size analyzer with a dual ultrasonic structure according to claim 1, characterized in that: The stirring auxiliary mechanism (4) includes a mounting bracket (401), the mounting bracket (401) is fixedly mounted on the particle size analyzer body (1), a motor assembly (402) is rotatably connected to the mounting bracket (401), an output end of the motor assembly (402) is transmission-connected to a telescopic round rod (403), the telescopic round rod (403) is fixedly connected to the three-blade propeller (305), a driving shaft (404) is provided between the motor assembly (402) and the mounting bracket (401), and the rotation of the driving shaft (404) causes the pitch angle of the motor assembly (402) to change.

3. The laser particle size analyzer with a dual ultrasonic structure according to claim 1, characterized in that: The phase difference of the driving signals of adjacent piezoelectric ceramic pieces (302) is ninety degrees, and the angle between adjacent piezoelectric ceramic pieces (302) is ninety degrees.

4. The laser particle size analyzer with a dual ultrasonic structure according to claim 1, characterized in that: The pitch angle of the three-blade propeller (305) is thirty degrees, and the diameter of the three-blade propeller (305) is less than one-third of the diameter of the inscribed circle of the sample pool (2).

5. The laser particle size analyzer with a dual ultrasonic structure according to claim 1, characterized in that: Micropores are provided on the surface of the three-blade propeller (305).

6. The laser particle size analyzer with a dual ultrasonic structure according to claim 1, characterized in that: The laser measurement mechanism (5) comprises a laser incident window (501) and a laser receiving window (502), wherein the laser incident window (501) and the laser receiving window (502) are respectively provided on two symmetrical sides of the sample cell (2), a quartz-graphene composite window (503) is provided inside the laser incident window (501), and a sapphire-nano coating window (504) is provided inside the laser receiving window (502).

7. The laser particle size analyzer with a dual ultrasonic structure according to claim 6, characterized in that: The quartz-graphene composite window (503) is tilted at 45°, and the sapphire-nano coating window (504) is a wedge-shaped optical window.

8. The laser particle size analyzer with a dual ultrasonic structure according to claim 2, characterized in that: The splash-proof covering mechanism (6) comprises a top cover plate (601) detachably mounted on the upper end of the sample pool (2), a rubber mounting seat (602) being provided on the top cover plate (601), a bearing assembly (603) being provided on the rubber mounting seat (602), and the bearing assembly (603) being slidably connected to the telescopic round rod (403).

9. The laser particle size analyzer with a dual ultrasonic structure according to claim 8, characterized in that: A feeding channel (604) is provided on the top cover plate (601), and a plurality of mutually independent rubber baffles (605) are fixedly installed inside the feeding channel (604).

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