Micro-nano powder bulk density testing device and method capable of controlling vibration frequency

Abstract

The invention provides a micro-nano powder bulk density testing device and method with controllable vibration frequency, and relates to the technical field of micro-nano powder bulk density testing, and the device comprises a vibration module, a sample preparation module and a measurement module; wherein the vibration module is located below the sample preparation module, and the vibration module is connected with the sample preparation module, so that the sample preparation module and the vibration module vibrate synchronously; a discharge port of the sample preparation module directly faces a feed port of the measurement module, and micro-nano powder slides down from the sample preparation module through vibration and then directly falls into a sample cup; the device provided by the invention solves the problems of blockage in traditional charging and instability in the jolt ramming process, and remarkably improves the test efficiency and accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of micro-nano powder bulk density testing, and particularly to a micro-nano powder bulk density testing device and method with a controllable vibration frequency. Background Art

[0002] Traditional powder bulk density testing methods (such as manual tapping or free fall method) have significant defects in the testing of micro-nano powders (particle size < 100μm). Due to the van der Waals force and electrostatic adsorption between micro-nano particles, traditional methods are prone to uneven filling and particle agglomeration, resulting in poor repeatability and low accuracy of test results. In addition, the prior art lacks precise control of vibration parameters and cannot adapt to the special physical properties of micro-nano powders. For example, when using a funnel for feeding, the powder is prone to electrostatic agglomeration and blockage of the feeding port, leading to sample preparation errors. Therefore, there is an urgent need for a high-precision testing device and method that can overcome the above problems to achieve standardized and repeatable measurement of the bulk density of micro-nano powders. Summary of the Invention

[0003] In view of the above technical problems, the technical solution adopted by the present invention is as follows:

[0004] According to the first aspect of the present application, there is provided a micro-nano powder bulk density testing device with a controllable vibration frequency, the device comprising:

[0005] a vibration module, a sample preparation module, and a measurement module;

[0006] wherein, the vibration module is located below the sample preparation module, and the vibration module is connected to the sample preparation module so that the sample preparation module vibrates synchronously with the vibration module;

[0007] the discharge port of the sample preparation module faces the inlet port of the measurement module, and the micro-nano powder slides out from the sample preparation module through vibration and directly falls into the sample cup.

[0008] Further, the vibration module includes: a vibration platform, a vibrator, and a sample cup limiting ring; wherein, the vibrator is installed on the vibration platform, a vibrator tray is installed at the top of the vibrator, and a sample cup limiter is provided at the center of the vibrator tray.

[0009] Further, a spirit level is provided at a preset position of the vibrator tray.

[0010] Further, the sample preparation module includes an open chute, and the open chute is fixedly connected to the vibrator tray through a chute bracket and forms an angle with the horizontal plane that is inclined downward at a preset angle.

[0011] Further, the length of the open chute is 30 cm to 50 cm, the width is 5 cm, and the preset angle is 30°.

[0012] Further, the measurement module includes a sample cup.

[0013] According to another aspect of the present application, there is also provided a method for testing the bulk density of micro-nano powder with a controllable vibration frequency based on the device according to any one of the first aspects. The method includes the following steps:

[0014] S100, place the micro-nano powder to be tested in a drying oven for drying, and place the dried sample in a desiccator to cool to room temperature;

[0015] S200, place the vibrator on the bottom plate of the steel open chute support, and place the front legs of the steel open chute support within the sample cup limit ring of the vibrator;

[0016] S300, adjust the bubble in the leveling tube installed on the top tray of the vibrator to be centered by adjusting the adjustable support at the bottom of the vibrator, so that the top tray of the vibrator is horizontal;

[0017] S400, fix the steel open chute to the front and rear legs of the support through a connecting piece, and the inclination angle between the installed steel open chute and the horizontal line is 30°;

[0018] S500, clean the sample cup and weigh the mass of the sample cup as m0, then place the sample cup on another placement table that is not disturbed by the vibration of the vibrator and is phase-separated. The center of the cup mouth of the sample cup is aligned with the discharge port of the steel open chute, and adjust the height difference between the upper mouth of the sample cup and the lowest point of the discharge port of the steel open chute to be 50 mm;

[0019] S600, pour the dried micro-nano powder sample onto the rear end of the steel open chute, then adjust the frequency of the vibrator to the test set value, turn on the vibrator control switch, the vibrator drives the steel open chute fixedly connected to the steel support to vibrate, slowly load the micro-nano powder into the sample cup until the sample cup is full and a conical pile of materials is formed at the cup mouth of the sample cup, and then turn off the vibrator;

[0020] S700, use a flat-mouth steel ruler to remove the excess sample above the cup mouth from the middle position at the top of the sample cup to both sides, scrape the surface of the sample flat, and weigh the mass of the sample and the cup as m1;

[0021] S800, level the vibrator after removing the sample loading support and the steel open chute, and place the sample prepared in S700 in the sample cup limiter on the horizontal tray at the top of the vibrator; place the steel sample tablet on the top of the sample cup, make the steel sample tablet in flat contact with the sample and be located within the cup wall, and ensure that the steel sample tablet can freely sink with the sample during the vibration of the sample;

[0022] S900, adjust the vibrator frequency to the vibration frequency specified in the test, then turn on the vibrator and the timer simultaneously to the specified values in the test, turn off the vibrator, and stop the vibration;

[0023] S1000, use a laser rangefinder to measure the distance from the top of the steel sample tablet to the mouth of the sample cup. When measuring, select four outer edge points corresponding to two perpendicular diameters of the upper mouth of the sample cup for measurement, and take the average of the 4 measurement results as the sample settlement depth h1;

[0024] S1100, calculate the bulk density.

[0025] Furthermore, step S1100 includes the following steps:

[0026] S1101, calculate the volume difference V1 of the micro-nano powder to be measured = ((h0 - h1) / h0) × V0; where V0 is the volume of the sample cup; h0 is the height of the sample cup;

[0027] S1102, determine the bulk density ρ0' = (m1 - m0) / V1 according to V1.

[0028] The present invention has at least the following beneficial effects:

[0029] The micro-nano powder bulk density testing device with controllable vibration frequency of the present invention has the following beneficial effects:

[0030] Improve sample preparation uniformity and test accuracy: Drive the steel chute through high-frequency and low-amplitude vibration, so that the micro-nano powder disperses and slides under vibration conditions, effectively reducing particle agglomeration, and ensuring uniform filling of the loose and compacted bulk density;

[0031] Controllable dynamic parameters: The vibration frequency, amplitude and vibration time can be flexibly adjusted according to the powder characteristics, adapting to the test requirements of different micro-nano materials, and improving the universality of the method;

[0032] Standardized operation process: From sample pretreatment, equipment leveling, vibration sample preparation to density calculation, a full-chain standardized process is established to ensure the consistency and reliability of experimental data;

[0033] Efficient measurement technology: Combine a laser rangefinder and an electronic balance to achieve rapid and accurate measurement of the sample volume and mass, reducing human operation errors;

[0034] Innovative structural design: The linkage design of the steel open chute and the vibrator, and the introduction of the steel sample tablet solve the problems of traditional loading blockage and unstable compaction process, and significantly improve the test efficiency and accuracy. Description of the Drawings

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0036] Figure 1 It is a schematic diagram of the overall structure of the micro-nano powder bulk density testing device with controllable vibration frequency provided by the embodiment of the present invention;

[0037] Figure 2 It is a schematic diagram of the structure of the vibration module provided by the embodiment of the present invention;

[0038] Figure 3 It is a top view of the vibration module provided by the embodiment of the present invention. Specific embodiments

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0040] It should be noted that based on this disclosure, those skilled in the art should understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, this device and / or this method can be implemented using other structures and / or functions in addition to one or more of the aspects described herein.

[0041] The following will refer to Figures 1 to 3 , and introduce a micro-nano powder bulk density testing device with controllable vibration frequency. The micro-nano powder bulk density testing device with controllable vibration frequency includes:

[0042] A vibration module, a sample preparation module, and a measurement module; wherein, the vibration module is located below the sample preparation module, and the vibration module is connected to the sample preparation module so that the sample preparation module vibrates synchronously with the vibration module; the discharge port of the sample preparation module is directly opposite to the feed port of the measurement module, and the micro-nano powder slides out from the sample preparation module through vibration and directly falls into the sample cup.

[0043] Further, the vibration module includes: a vibration platform, a vibrator, and a specimen cup limiting ring; wherein, the vibrator is installed on the vibration platform, a vibration tray is installed at the top of the vibrator, and a specimen cup limiter is provided at the center of the vibration tray.

[0044] Further, a spirit level is provided at a preset position of the vibration tray.

[0045] Further, the sample preparation module includes an open chute, and the open chute is fixedly connected to the vibration tray through a chute support and forms an angle with a preset downward inclination with the horizontal plane.

[0046] Further, the length of the open chute is 30 cm to 50 cm, and the width is 5 cm; the preset angle is 30°.

[0047] Further, the measurement module includes a specimen cup.

[0048] Specifically, the vibration module: includes a vibrator, the power can be 100 W, the vibration frequency range can be 3000 Hz - 5000 Hz, the amplitude can be 0.1 - 1 mm, a specimen cup limiter is provided at the center of the tray at the top of the vibrator, and a spirit level is provided on the vibration tray for leveling.

[0049] The sample preparation module: connects a steel open chute through a steel bracket (the length is between 30 - 35 cm, the bottom width of the chute is 5 cm, and the inner surface of the chute is flat and smooth; the chute is fixed through a steel bracket and forms an angle of 30° with a downward inclination with the horizontal plane; during sample preparation, the vibrator is placed on the bottom plate of the chute support, and the front legs of the chute are placed on the horizontal tray of the vibrator, so as to realize the free sliding and filling of the specimen cup by the micro-nano powder under the vibration condition of the vibrator. The vibration sliding method can effectively reduce the agglomeration problem of the micro-nano powder caused by static electricity, etc., and solves the problem of sample preparation uniformity during the measurement of the bulk density of the micro-nano powder.

[0050] The measurement module: regulates the sample preparation of the vibrator by adjusting the vibration frequency and amplitude of the vibrator in real time. After the sample is prepared, an electronic balance is used to weigh the mass of the micro-nano powder sample with an accuracy of 0.01 g; the volume of the specimen cup (the volume of the glass cup V0 = 235 mL, the diameter φ0 = 60.60 mm, the height h0 = 79.15 mm) is calibrated with room temperature water, and the height and diameter of the specimen cup, as well as the height of the specimen after vibration compaction, are measured by a laser rangefinder with an accuracy of not less than 0.01 mm.

[0051] The micro-nano powder bulk density test device with a controllable vibration frequency in this embodiment has the following beneficial effects:

[0052] Improve sample preparation uniformity and test accuracy: By driving a steel chute through high-frequency and low-amplitude vibration, the micro-nano powder is dispersed and slides down under vibration conditions, effectively reducing particle agglomeration and ensuring uniform filling of loose and tapped bulk densities;

[0053] Controllable dynamic parameters: The vibration frequency, amplitude, and vibration time can be flexibly adjusted according to the powder characteristics to meet the test requirements of different micro-nano materials and improve the universality of the method;

[0054] Standardized operation process: A full-chain standardized process has been established from sample pretreatment, equipment leveling, vibration sample preparation to density calculation to ensure the consistency and reliability of experimental data;

[0055] Efficient measurement technology: Combining a laser rangefinder and an electronic balance, rapid and accurate measurement of the sample volume and mass is achieved, reducing human operation errors;

[0056] Innovative structural design: The linkage design of the steel open chute and the vibrator, as well as the introduction of the steel sample tablet, solve the problems of traditional loading blockage and unstable compaction process, significantly improving the test efficiency and accuracy.

[0057] In an exemplary embodiment, a method for testing the bulk density of micro-nano powder with a controllable vibration frequency based on the device described in any one of the above embodiments is provided. The method includes the following steps:

[0058] S100, Place the micro-nano powder to be tested in a drying oven for drying, and place the dried sample in a desiccator to cool to room temperature.

[0059] In this embodiment, first, sample pretreatment is carried out: Place the micro-nano powder to be tested in a drying oven at a temperature of 105 ± 5 °C for at least 4 hours, and place the dried sample in a desiccator to cool to room temperature for standby.

[0060] S200, Place the vibrator on the bottom plate of the steel open chute support, and place the front legs of the steel open chute support inside the limit ring of the vibrator sample cup.

[0061] Installation of the steel open chute: Place the vibrator on the bottom plate of the steel open chute support, and at the same time place the front legs of the steel open chute support inside the limit ring of the vibrator sample cup.

[0062] S300, Adjust the bubble in the level tube installed on the top tray of the vibrator to be centered by adjusting the adjustable support at the bottom of the vibrator to make the top tray of the vibrator horizontal.

[0063] S400, Fix the steel open chute to the front and rear legs of the support through a connecting piece. The inclination angle between the installed steel open chute and the horizontal line is 30°.

[0064] Fixing of the steel open chute: Fix the steel open chute to the front and rear legs of the bracket through connecting pieces. After installation, the inclination angle between the steel open chute and the horizontal line is 30°.

[0065] S500, clean the sample cup and weigh the heating mass of the sample cup as m0. Then place the sample cup on another placement table for phase separation that is not disturbed by the shaker vibration. Align the center of the cup mouth of the sample cup with the discharge port of the steel open chute, and adjust the height difference between the upper mouth of the sample cup and the lowest point of the discharge port of the steel open chute to 50 mm.

[0066] Weighing and placing of the sample cup: Clean the sample cup and weigh its mass m0. Then place the sample cup on another placement table for phase separation that is not disturbed by the shaker vibration. Align the center of the cup mouth of the sample cup with the discharge port of the steel open chute, and adjust the height difference between the upper mouth of the sample cup and the lowest point of the discharge port of the steel open chute to 50 mm.

[0067] S600, pour the dried micro-nano powder sample onto the rear end of the steel open chute, then adjust the frequency of the shaker to the test set value, turn on the shaker control switch. The shaker drives the steel open chute fixedly connected to the steel bracket to vibrate, and slowly load the micro-nano powder into the sample cup until the sample cup is full and a conical pile of material is formed at the cup mouth of the sample cup, then turn off the shaker.

[0068] Sample preparation for loose bulk density: Pour about 300 g of the micro-nano powder sample prepared as a spare in S100 onto the rear end of the steel open chute installed in S500. Then adjust the frequency of the shaker to the test set value, turn on the shaker control switch. The shaker drives the steel open chute fixedly connected to the steel bracket to vibrate, and slowly load the micro-nano powder into the sample cup until the sample cup is full and a conical pile of material is formed at the cup mouth of the sample cup. At this time, turn off the shaker.

[0069] S700, use a flat-edge steel ruler to remove the excess sample above the cup mouth from the middle position at the top of the sample cup to both sides, scrape the surface of the sample flat, and weigh the mass m1 of the sample and the cup.

[0070] Scraping and weighing: Use a flat-edge steel ruler to remove the excess sample above the cup mouth from the middle position at the top of the sample cup to both sides, and scrape the surface of the sample flat. Then weigh the mass m1 of the sample and the cup on an electronic balance with an accuracy of 0.01 g.

[0071] S800, level the shaker after removing the sample loading bracket and the steel open chute, and place the sample prepared in S700 in the sample cup limiter on the horizontal tray at the top of the shaker; place the steel sample tablet on the top of the sample cup, make the steel sample tablet contact the sample flatly and be inside the cup wall, ensuring that the steel sample tablet can freely sink with the sample during the vibration of the sample.

[0072] Placement of the steel sample tablet: Level the vibrator after removing the sample loading bracket and the steel open chute, and place the sample prepared in S700 in the sample cup limiter on the horizontal tray at the top of the vibrator; then place the steel sample tablet (a stainless steel round plate with a thickness d = 2 mm and a diameter Φ1 = 60 mm, with a short handle installed in the middle of the round plate, and the mass of the steel sample tablet is 15 g) on top of the sample cup, making it in flat contact with the sample and centered within the cup wall to ensure that the steel sample tablet can freely sink with the sample during the vibration of the sample.

[0073] For S900, adjust the vibrator frequency to the vibration frequency specified in the test, then turn on the vibrator and the timer simultaneously to the specified values in the test, and then turn off the vibrator to stop the vibration.

[0074] Measurement of the tapped density: Adjust the vibrator frequency to the vibration frequency specified in the test, then turn on the vibrator and the timer simultaneously to the specified values in the test (it can also be controlled until the sample sinks stably), and then turn off the vibrator to stop the vibration.

[0075] For S1000, use a laser rangefinder to measure the distance from the top of the steel sample tablet to the mouth of the sample cup. When measuring, select four outer edge points corresponding to two mutually perpendicular diameters at the upper mouth of the sample cup for measurement, and take the average of the 4 measurement results as the sample sinking depth h1.

[0076] Measurement of the sample sinking depth: Immediately use a laser rangefinder to measure the distance from the top of the steel sample tablet to the mouth of the sample cup. When measuring, select four outer edge points corresponding to two mutually perpendicular diameters at the upper mouth of the sample cup for measurement, and take the average of the 4 measurement results as the sample sinking depth (the final sample sinking depth should include the thickness of the steel sample tablet) h1.

[0077] For S1100, calculate the bulk density.

[0078] Repeat the above steps S200 - S1000. Conduct two parallel tests on the same sample, and take the average of the two test results as the final test result. The test result is accurate to 0.01 g / cm 3 。

[0079] Furthermore, step S1100 includes the following steps:

[0080] For S1101, calculate the volume difference V1 of the micro-nano powder to be measured = ((h0 - h1) / h0) × V0; where V0 is the volume of the sample cup; h0 is the height of the sample cup; accurate to two decimal places, unit mL.

[0081] For S1102, determine the bulk density ρ0’ = (m1 - m0) / V1 according to V1; retain two decimal places, unit g / cm 3 。

[0082] In an exemplary embodiment, specific tests were conducted as follows:

[0083] Test object: fly ash.

[0084] Parameter settings: vibration frequency 5000 Hz, amplitude 0.5 mm.

[0085] The test results are shown in Table 1:

[0086] Table 1

[0087]

[0088] The test method in this embodiment overcomes the influence of the agglomeration of micro-nano powders on the test results in traditional test methods: in this test method, the vibrator drives the inclined steel open chute to vibrate, and the micro-nano powders vibrate and slide down into the sample cup on the chute, forming a loose stacking state. This test method overcomes the error in sample preparation caused by the electrostatic agglomeration of micro-nano powders blocking the funnel discharge port when using a funnel for loading in traditional test methods. And by loading samples through the vibrating chute, the already agglomerated micro-nano powders can be dispersed, which also ensures the accuracy of the measurement of the tapped bulk density.

[0089] A standardized test process based on quantitative control was established: the test method established a standardized test operation specification for the whole chain of sample pretreatment - equipment treatment - sample preparation - result measurement with an adjustable vibration frequency of the vibrator, providing a standard paradigm for scientific research to obtain accurate and reliable test data.

[0090] In addition, although the steps of the methods in the present disclosure are described in a specific order in the drawings, this does not require or imply that these steps must be performed in that specific order, or that all the steps shown must be performed to achieve the desired result. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step for execution, and / or one step may be decomposed into multiple steps for execution, etc.

[0091] An embodiment of the present invention also provides a non-transitory computer-readable storage medium, which can be set in an electronic device to store at least one instruction or at least one segment of a program related to a method in the method embodiment, and the at least one instruction or the at least one segment of the program is loaded and executed by the processor to implement the method provided in the above embodiment.

[0092] The program product may adopt any combination of one or more readable media. The readable media may be a readable signal medium or a readable storage medium. The readable storage medium may, for example, but not be limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples of the readable storage medium (a non-exhaustive list) include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0093] The computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, in which the readable program code is carried. Such a propagated data signal may take various forms, including but not limited to an electromagnetic signal, an optical signal, or any suitable combination of the above. The readable signal medium may also be any readable medium other than the readable storage medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device.

[0094] The program code contained on the readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wired, optical fiber cable, RF, etc., or any suitable combination of the above.

[0095] The program code for performing the operations of this application may be written in any combination of one or more programming languages, including object-oriented programming languages such as Java, C++, etc., and also including conventional procedural programming languages such as the "C" language or similar programming languages. The program code may be executed entirely on the user's computing device, partially on the user's device, executed as a stand-alone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user's computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., by using an Internet service provider to connect through the Internet).

[0096] An embodiment of the present invention also provides an electronic device, including a processor and the aforementioned non-transitory computer-readable storage medium.

[0097] The electronic device is merely an example and should not impose any limitation on the functions and usage scope of the embodiments of this application.

[0098] The electronic device is presented in the form of a general-purpose computing device. The components of the electronic device may include, but are not limited to: at least one of the above-mentioned processors, at least one of the above-mentioned memories, and a bus connecting different system components (including the memory and the processor).

[0099] Wherein, the memory stores program codes, and the program codes can be executed by the processor, so that the processor executes the steps in various embodiments described in this specification.

[0100] The memory may include a readable medium in the form of volatile memory, such as random access memory (RAM) and / or cache memory, and may further include read-only memory (ROM).

[0101] The memory may also include a program / utilities having a set (at least one) of program modules. Such program modules include, but are not limited to: an operating system, one or more application programs, other program modules, and program data. Each or some combination of these examples may include the implementation of a network environment.

[0102] The bus may represent one or more of several types of bus structures, including a memory bus or a memory controller, a peripheral bus, a graphics acceleration port, a processor, or a local bus using any of the various bus structures.

[0103] The electronic device may also communicate with one or more external devices (such as a keyboard, a pointing device, a Bluetooth device, etc.), may also communicate with one or more devices that enable a user to interact with the electronic device, and / or communicate with any device that enables the electronic device to communicate with one or more other computing devices (such as a router, a modem, etc.). Such communication may be carried out through an input / output (I / O) interface. And, the electronic device may also communicate with one or more networks (such as a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) through a network adapter. The network adapter communicates with other modules of the electronic device through the bus. It should be understood that although not shown in the figure, other hardware and / or software modules may be used in combination with the electronic device, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, etc.

[0104] Through the description of the above embodiments, those skilled in the art can easily understand that the exemplary embodiments described herein can be implemented by software or by a combination of software and necessary hardware. Therefore, the technical solutions according to the embodiments of the present disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, including several instructions to enable a computing device (such as a personal computer, a server, a terminal device, or a network device, etc.) to execute the method according to the embodiments of the present disclosure.

[0105] An embodiment of the present invention also provides a computer program product, which includes program code. When the program product runs on an electronic device, the program code is used to cause the electronic device to execute the steps in the methods according to various exemplary embodiments of the present invention described above in this specification.

[0106] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for the purpose of illustration and not for the purpose of limiting the scope of the present invention. Those skilled in the art should also understand that various modifications can be made to the embodiments without departing from the scope and spirit of the present invention.

Claims

1. A micro-nano powder bulk density testing device with controllable vibration frequency, characterized in that: The device comprises: a vibration module, a sample preparation module and a measurement module; Wherein, the vibration module is located below the sample preparation module, and the vibration module is connected to the sample preparation module, so that the sample preparation module and the vibration module vibrate synchronously; The material outlet of the sample preparation module is directly opposite to the material inlet of the measurement module, and the micro-nano powder slides from the sample preparation module through vibration and directly falls into the sample cup.

2. The micro-nano powder bulk density testing device with controllable vibration frequency according to claim 1, characterized in that: The vibration module comprises: a vibrator table, a vibrator and a sample cup limiting ring; wherein the vibrator is installed on the vibrator table, a vibrator tray is installed on the top of the vibrator, and a sample cup limiting ring is arranged in the center of the vibrator tray.

3. The micro-nano powder bulk density testing device with controllable vibration frequency according to claim 2, characterized in that: A level tube is arranged at a preset position of the vibrator tray.

4. The micro-nano powder bulk density testing device with controllable vibration frequency according to claim 2, characterized in that: The sample preparation module comprises an open chute, which is fixedly connected to the vibrator tray via a chute bracket and forms an angle with a horizontal plane in which the opening is tilted downward at a preset angle.

5. The micro-nano powder bulk density testing device with controllable vibration frequency according to claim 4, characterized in that: The length of the open chute is 30 cm to 50 cm, the width is 5 cm, and the preset angle is 30°.

6. The micro-nano powder bulk density testing device with controllable vibration frequency according to claim 4, characterized in that: The measuring module includes a sample cup.

7. A method for testing the bulk density of micro-nano powders with controllable vibration frequency based on the device according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: S100, placing the micro-nano powder to be tested in a drying oven for drying, and placing the dried sample in a desiccator for cooling to room temperature; S200, place the vibrator on the bottom plate of the steel open chute support, and place the front leg of the steel open chute support in the limiting ring of the vibrator sample cup; S300, adjust the bubble of the spirit level installed on the top tray of the vibrator to the center by adjusting the adjustable support at the bottom of the vibrator to make the top tray of the vibrator level; S400, the steel open chute is fixed to the front and rear legs of the bracket through the connector, and the inclination angle between the installed steel open chute and the horizontal line is 30°; S500, clean the sample cup and weigh the heating mass of the sample cup as m0, then place the sample cup on another separate storage table that is not disturbed by the vibration of the vibrator, align the center of the mouth of the sample cup with the discharge port of the steel open chute, and adjust the height difference between the upper mouth of the sample cup and the lowest point of the discharge port of the steel open chute to 50 mm; S600, pour the dried micro-nano powder sample into the rear end of the steel open chute, then adjust the frequency of the vibrator to the test setting value, turn on the vibrator control switch, the vibrator drives the steel open chute fixedly connected to the steel bracket to vibrate, slowly put the micro-nano powder into the sample cup until the sample cup is full and a conical material pile is formed at the mouth of the sample cup, and then turn off the vibrator; S700, use a flat steel ruler to remove the excess sample above the cup mouth from the middle of the top of the sample cup to both sides, scrape the surface of the sample flat, and weigh the mass of the sample and the cup m1; S800, level the vibrator after removing the sample support and the steel open chute, and place the sample prepared in S700 in the sample cup stopper on the horizontal tray at the top of the vibrator; place the steel sample pressing piece on the top of the sample cup, so that the steel sample pressing piece is in flat contact with the sample and is located in the cup wall, ensuring that the steel sample pressing piece can sink freely with the sample during the sample vibration process; S900, adjust the frequency of the vibrator to the vibration frequency specified in the test, then turn on the vibrator and the timer simultaneously to the specified value of the test, turn off the vibrator, and stop the vibration; S1000, use a laser rangefinder to measure the distance between the top of the steel sample pressing piece and the mouth of the sample cup. When measuring, select four outer points corresponding to two mutually perpendicular diameters of the upper mouth of the sample cup for measurement, and take the average of the four measurement results as the sample sinking depth h1; S1100, calculate bulk density.

8. The method for testing the bulk density of micro-nano powders with controllable vibration frequency according to claim 7, characterized in that: Step S1100 includes the following steps: S1101, calculate the volume difference V1 of the micro-nano powder to be tested = ((h0-h1) / h0) × V0; wherein V0 is the volume of the sample cup; h0 is the height of the sample cup; S1102, based on V1, determine the bulk density ρ0'= (m1-m0) / V1.

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