Rotary testing device and handheld LIBS spectrometer

Abstract

The invention provides a rotary testing device and a handheld LIBS spectrograph, the rotary testing device comprises a shell, a table cover unit and a rotating unit, the table cover unit comprises a rotary table cover and a sample cover gasket, the sample cover gasket is provided with a laser through hole, one end of the rotary table cover is fixedly connected with the shell, and the other end of the rotary table cover is provided with the sample cover gasket; the rotating unit comprises an eccentric motor and a sample mounting assembly, the sample mounting assembly penetrates through the containing cavity of the rotary table cover and extends to the sample cover gasket, a sample pressing piece is mounted at the end, close to the sample cover gasket, of the sample mounting assembly, and the sample pressing piece and a rotating shaft of the eccentric motor rotate synchronously. Laser is accurately focused on the surface of the sample pressing piece through the laser through hole, the sample mounting assembly drives the sample pressing piece to synchronously rotate along with the rotating shaft, laser pulses can be irradiated on different test point positions of the sample pressing piece every time, and the test point positions of the sample pressing piece are controlled by controlling rotation of the eccentric motor. The problems that the spectral intensity is weakened and the algorithm result is unstable are solved, and the accuracy and reliability of measurement are greatly improved.

Description

Technical Field

[0001] The invention belongs to the field of chemical equipment, and in particular relates to a rotating testing device and a handheld LIBS spectrometer. Background Art

[0002] Handheld Laser-Induced Breakdown Spectroscopy (LIBS) is a portable analytical device that uses laser pulses to generate high-temperature plasma on the surface of a sample to analyze its composition and elemental information. The working principle mainly includes: using a laser transmitter to emit high-energy laser pulses, the laser pulses are focused on the surface of the sample to be tested, and its energy is sufficient to generate local high temperatures (thousands of degrees Celsius) on the surface of the sample to form plasma. Plasma is a mixture of positively charged ions and free electrons. After the plasma cools, the excited atoms and ions will radiate thermal radiation in various wavelengths of light. The spectral line emitted by each element after excitation is unique, and the emitted light is collected by an optical system (such as a lens or optical fiber) and transmitted to a spectrometer. The spectrometer decomposes the light into different wavelengths (colors) to generate a spectrum. After analysis, the presence and concentration of each element in the sample are determined.

[0003] The commonly used handheld LIBS spectrometer includes a head and a handle at the bottom of the head. When the spectrometer is testing powder tablets, due to the impact of laser ablation, the sample is easily broken up to form deep pits, which leads to a rapid weakening of the spectral signal intensity and extreme instability, thus affecting the analysis accuracy. Especially when the accuracy and stability of the test are required to be high, it is necessary to collect different points of the sample while avoiding excessive signal intensity changes. Therefore, it is necessary to design a rotating test device and a handheld LIBS spectrometer. Summary of the invention

[0004] In view of the above shortcomings of the prior art, the object of the present invention is to provide a rotating testing device and a handheld LIBS spectrometer, in which the sample press rotates eccentrically around the light output detection point, and different points of the sample press are collected, and the spectrum collected each time is relatively stable, thereby improving the measurement accuracy.

[0005] To achieve the above-mentioned object and other related objects, the present invention provides a rotation testing device, comprising:

[0006] case;

[0007] A stage cover unit, the stage cover unit comprises a turntable cover and a sample cover gasket, the sample cover gasket is provided with a laser through hole, one end of the turntable cover is fixedly connected to the housing, and the other end is provided with the sample cover gasket;

[0008] A rotating unit, the rotating unit comprising an eccentric motor and a sample mounting assembly, wherein the sample mounting assembly and the rotating shaft of the eccentric motor are coaxially connected;

[0009] The sample mounting assembly passes through the cavity of the turntable cover and extends toward the sample cover gasket, and a sample pressing plate is installed at one end of the sample mounting assembly close to the sample cover gasket, and the eccentric motor drives the sample mounting assembly to rotate to drive the sample pressing plate to rotate synchronously.

[0010] In a preferred embodiment of the present invention, the table cover unit further comprises a fan assembly, the fan assembly is mounted on two opposite sides of the turntable cover, and the fan assembly is provided with an air suction port;

[0011] Air outlets are arranged on both sides of the turntable cover where the fan assembly is mounted, and the air inlet and the air outlet are correspondingly connected.

[0012] In a preferred embodiment of the present invention, the laser through hole is located at the center of the sample cover gasket, and a transverse groove is provided on a surface of the sample cover gasket close to the sample mounting assembly. The transverse groove extends along the diameter direction of the sample cover gasket, and the two ends of the transverse groove are respectively close to the two sides where the fan assembly is arranged.

[0013] In a preferred embodiment of the present invention, the turntable cover is coaxially sleeved outside the sample mounting assembly, and a gap exists between the turntable cover and the sample mounting assembly.

[0014] In a preferred embodiment of the present invention, a positioning step is provided at one end of the turntable cover, the sample cover gasket is cooperatedly arranged on the positioning step, and a gap is left between the sample cover gasket and the sample mounting assembly.

[0015] In a preferred embodiment of the present invention, the sample mounting assembly comprises:

[0016] A sample fixing cover, wherein the sample fixing cover is connected to the rotating shaft of the eccentric motor;

[0017] The sample cover is fixedly mounted on the sample fixing cover and arranged coaxially therewith, and the sample pressing sheet is pressed inside the end of the sample cover away from the sample fixing cover.

[0018] In a preferred embodiment of the present invention, a first magnet and a second magnet having opposite magnetic properties are respectively provided at one end where the sample fixing cover and the sample cover are connected to each other.

[0019] In a preferred embodiment of the present invention, the housing comprises:

[0020] A motor mounting shell, wherein the eccentric motor is mounted in the motor mounting shell, and a positioning boss is provided on the top surface of the motor mounting shell, and the positioning boss cooperates with the turntable cover for positioning;

[0021] A battery compartment is fixedly connected to one side of the motor mounting shell.

[0022] In a preferred embodiment of the present invention, a reset switch is further included, and the reset switch is connected to the battery spring in the battery compartment.

[0023] The present invention also provides a handheld LIBS spectrometer, which comprises a spectrometer body and the above-mentioned rotating test device. The sample cover gasket of the rotating test device is installed on the light outlet of the spectrometer body and is sealed by a sealing ring.

[0024] The beneficial technical effects of the present invention include at least:

[0025] The sample cover gasket of the rotary test device of the present invention is provided with a laser through hole. The design of the laser through hole enables the laser to be accurately focused on the surface of the sample pressing plate. The rotating shaft of the eccentric motor drives the sample cover to rotate, and the sample pressing plate rotates synchronously with the rotating shaft, thereby ensuring the stability of the sample during the test and reducing the error caused by the movement of the sample during the measurement process. At the same time, each laser pulse can be made to hit different test points of the sample pressing plate, and the test point of the sample pressing plate can be controlled by controlling the rotation of the eccentric motor, thereby overcoming the problems of spectrum intensity weakening and unstable algorithm results, and greatly improving the accuracy and reliability of the measurement.

[0026] The fan assembly of the present invention is combined with the design of the turntable cover, and an air suction port is provided on the fan assembly. When the fan assembly is started, the gas in the cavity of the turntable cover is sucked in and discharged to the external environment through the exhaust ports on both sides, which can achieve the effect of ventilation and heat dissipation, reduce the heat generated during operation, and improve the reliability and life of the equipment. At the same time, the powder generated by the sample tablet irradiated by the laser can be sucked out with the air and discharged from the cavity by the fan assembly, avoiding contamination of the laser light path, and further ensuring the accuracy of the measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0028] Figure 1 The figure is a schematic structural diagram of a rotation testing device in one embodiment of the present invention.

[0029] Figure 2 The figure is a schematic diagram of the installation of a sample mounting assembly, an eccentric motor and a housing in one embodiment of the present invention.

[0030] Figure 3 The figure is a schematic diagram of the structure of a turntable cover in one embodiment of the present invention.

[0031] Figure 4 Schematic diagram of the structure of a sample cover gasket in one embodiment of the present invention.

[0032] Figure 5 The figure is a schematic diagram of the installation of a sample cover, a sample fixing cover and an eccentric motor in one embodiment of the present invention.

[0033] Figure 6 The figure is a schematic diagram of the structure of a handheld LIBS spectrometer in one embodiment of the present invention.

[0034] Explanation of reference numerals: 1. Table cover unit; 11. Turntable cover; 111. Positioning step; 112. Air outlet; 113. Air dispersion hole; 114. Disassembly and assembly slot; 115. Positioning slot; 12. Sample cover gasket; 121. Laser through hole; 122. Horizontal slot; 13. Fan assembly; 131. Turbofan; 2. Housing; 21. Motor mounting housing; 211. Positioning boss; 22. Battery compartment; 23. Self-reset switch; 3. Rotation unit; 31. Eccentric motor; 32. Sample mounting assembly; 321. Sample cover; 322. Sample fixing cover; 40. Sample pressing plate; 100. Rotating test device; 50. Spectrometer body. DETAILED DESCRIPTION

[0035] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0036] It should be noted that the illustrations provided in this embodiment are only used to illustrate the basic concept of the present invention in a schematic manner. Therefore, the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0037] See also Figure 1 and Figure 2As shown, in order to achieve the above-mentioned purpose and other related purposes, the present invention proposes a rotating test device, including a table cover unit 1, a shell 2 and a rotating unit 3. The table cover unit 1 includes a turntable cover 11 and a sample cover gasket 12. The sample cover gasket 12 is provided with a laser through hole 121. The sample cover gasket 12 is installed at one end of the turntable cover 11; the other end of the turntable cover 11 is installed on the shell 2; the rotating unit 3 includes an eccentric motor 31 and a sample mounting assembly 32. The rotating shafts of the sample mounting assembly 32 and the eccentric motor 31 are coaxially connected. Among them, the sample mounting assembly 32 passes through the cavity of the turntable cover 11 and extends toward the sample cover gasket 12. A sample pressing plate 40 is installed at one end thereof close to the sample cover gasket 12. The eccentric motor 31 drives the sample mounting assembly 32 to rotate to drive the sample pressing plate 40 to rotate synchronously.

[0038] It should be noted that the eccentric motor 31 is an electric motor with an eccentric shaft design, in which the internal axis is not in the exact center position, but is offset from the center, thereby realizing a more complex motion conversion function. This design enables the motor to generate a variety of complex motion trajectories during rotation, including rotation, vibration, and swing. Its working principle is based on electromagnetic induction and eccentric shaft structure. When the motor is powered on, the internal magnetic field generates a rotational force, driving the eccentric shaft to rotate. Due to the design of the eccentric shaft, the motor can generate a variety of complex motion trajectories during rotation.

[0039] It should be noted that the sample cover gasket 12 directly replaces the existing test gasket of the handheld LIBS spectrometer, and is close to the spectrometer body 50 during testing, and the sample press 40 rotates together with the sample mounting assembly 32. The sample press 40 is formed by pressing directly in the mold and pressed into the sample mounting assembly 32 by a quick-pressing clamp. The sample press 40 replaces the existing powder sample of the handheld LIBS spectrometer. The eccentric motor 31 drives the sample mounting assembly 32 to rotate to drive the sample press 40 to rotate synchronously. The sample mounting assembly 32 and the turntable cover 11 are non-contacting, ensuring that the sample mounting assembly 32 rotates freely without hindrance. The laser emitted by the spectrometer body 50 can be incident on the test surface of the sample press 40 inside the device through the laser through hole 121 of the sample cover gasket 12. The eccentric motor 31 drives the sample press 40 to rotate eccentrically around the test point, that is, the laser through hole 121, so that each laser pulse hits different points on the test surface of the sample press 40, and the relative spectral intensity fluctuation obtained is stable, and the accuracy and stability of the results are greatly improved.

[0040] In a preferred embodiment of the present invention, the table cover unit 1 also includes a fan assembly 13, which is installed on two opposite sides of the turntable cover 11, and the fan assembly 13 is provided with an air suction port; the turntable cover 11 is provided with air outlets 112 on both sides of the fan assembly 13, and the air suction port and the air outlet 112 are correspondingly connected.

[0041] It should be noted that the fan assembly 13 includes a pair of turbo fans 131, and air outlets 112 are provided on opposite sides of the turntable cover 11. The pair of turbo fans 131 are installed on opposite sides of the turntable cover 11 through positioning slots 115, so that the air intake and the air outlet 112 are correspondingly connected.

[0042] It should be noted that an air intake port is provided on the mounting surface of the turbofan 131, and air exhaust ports are provided on both sides of the turbofan 131. When the turbofan 131 starts to operate, the gas in the cavity of the turntable cover 11 is sucked in and discharged to the external environment through the air exhaust ports on both sides, which can achieve the effect of ventilation and heat dissipation. At the same time, the broken powder generated by the sample press 40 irradiated by laser can be discharged from the cavity of the turntable cover 11.

[0043] See also Figure 4 As shown, in a preferred embodiment of the present invention, a laser through hole 121 is opened in the center of the sample cover gasket 12, and a transverse groove 122 is opened on one end surface of the sample cover gasket 12 corresponding to the sample mounting assembly 32. The transverse groove 122 extends along the diameter direction of the sample cover gasket 12, and the two ends of the transverse groove 122 are respectively close to the two sides of the turntable cover 11 on which a pair of turbo fans 131 are installed.

[0044] It should be noted that the scattered powder generated by the sample press 40 under laser irradiation will be sucked away by the turbo fan 131 along the transverse groove 122, avoiding contamination of the optical path of the pulsed laser, so that each pulsed laser hits the test surface of the sample press 40 at the same distance, which can effectively avoid the problem of spectral signal fluctuation.

[0045] In a preferred embodiment of the present invention, the turntable cover 11 is sleeve-shaped, and the turntable cover 11 is coaxially spaced outside the sample mounting assembly 32. A positioning step 111 is provided at one end of the turntable cover 11, and the sample cover gasket 12 is cooperatedly arranged on the positioning step 111, leaving a gap between the sample cover gasket 12 and the sample mounting assembly 32.

[0046] It should be noted that a gap is left between the bottom surface of the sample cover gasket 12 and the extended end of the sample mounting assembly 32 in order to further remove the powder generated by the laser irradiation of the sample pressing sheet 40 from the gap driven by the turbo fan 131. The sample cover gasket 12 is installed at one end of the turntable cover 11 through the positioning step 111. The outer diameter of the sample cover gasket 12 is 2 mm smaller than the diameter of the positioning step 11, making the installation simple and convenient.

[0047] See also Figure 3As shown, it should be noted that the turntable cover 11 is sleeve-shaped, and its outer wall is distributed along its axial direction with four ribs, each rib is arranged along the axial direction of the turntable cover 11, and the side wall of the turntable cover 11 is divided into a pair of first side walls and a pair of second side walls that are opposite to each other. The pair of first side walls are respectively provided with air outlets 112, and the pair of second side walls are respectively provided with heat dissipation holes 113. The heat dissipation holes 113 are distributed on the side wall with a large hole in the middle and small holes distributed around the large hole, and the small holes are trumpet-shaped. The large trumpet-shaped mouth is arranged on the outer side of the turntable cover 11, and the small trumpet-shaped mouth is arranged on the inner side of the turntable cover 11, so as to achieve the purpose of weight reduction design while facilitating heat dissipation.

[0048] At the same time, a positioning step 111 is provided at the upper end of the turntable cover 11, and the positioning step 111 is matched with the sample cover gasket 12. A pair of second side walls are provided with disassembly grooves 114 at the upper ends, which are used when disassembling the sample cover gasket 12. A positioning slot 115 is provided on each first side wall, which is used to clamp and install the turbofan 131. At the same time, in order to ensure the stable installation of the turbofan 131, the lower end of the turbofan 131 can be placed on the upper end of the housing 2.

[0049] See also Figure 5 As shown, in a preferred embodiment of the present invention, the sample mounting assembly 32 includes a coaxially connected sample cover 321 and a sample fixing cover 322, the sample cover 321 is cylindrical, the sample pressing sheet 40 is pressed inside one end of the sample cover 321, and the sample fixing cover 322 is connected to the rotating shaft of the eccentric motor 31.

[0050] It should be noted that the sample fixing cover 322 is disc-shaped, and internal threaded holes are provided in the middle of the rotating shaft of the eccentric motor 31 and the sample fixing cover 322, so that the sample fixing cover 322 is fixed to the rotating shaft of the eccentric motor 31 by screws.

[0051] In a preferred embodiment of the present invention, the other end of the sample cover 321 is connected to the sample fixing cover 322, and the connected ends of the sample fixing cover 322 and the sample cover 321 are respectively provided with a first magnet and a second magnet with opposite magnetic properties.

[0052] It should be noted that a magnetic suction groove is provided on the connection end surface of the sample cover 321, and the first magnet is adhered in the magnetic suction groove. A magnetic suction groove is provided on the connection end surface of the sample fixing cover 322, and the second magnet is adhered in the magnetic suction groove. When the sample cover 321 and the sample fixing cover 322 are close to each other, they will be attracted together, which is convenient for the disassembly and assembly of the sample cover 321, so as to replace the sample pressing piece 40 installed in the sample cover 321. The sample pressing piece 40 can be pressed in the sample cover 321 by a quick pressing clamp.

[0053] In a preferred embodiment of the present invention, the shell 2 includes a motor mounting shell 21 and a battery compartment 22, and the eccentric motor 31 is installed in the motor mounting hole of the motor mounting shell 21. A positioning boss 211 is provided at one end of the motor mounting hole. The positioning boss 211 cooperates with the turntable cover 11 for positioning and installing one end of the turntable cover 11.

[0054] It should be noted that the battery compartment 22 is fixedly mounted on one side of the motor mounting shell 21 or is integrally mounted on one side of the motor mounting shell 21. Small holes are provided around the motor mounting shell 21 to enhance heat dissipation. The positioning boss 211 is arranged in an arc shape, and the corresponding end of the turntable cover 11 can be arranged in contact with the inner side of the arc of the positioning boss 211.

[0055] In a preferred embodiment of the present invention, the battery spring in the battery compartment 22 is connected to a self-resetting switch 23. The eccentric motor 31 is a micro eccentric rotary motor with a compact structure. The entire rotary device is matched to ensure single-handed operation.

[0056] It should be noted that two No. 7 batteries are fixedly installed in the battery compartment 22 through the battery spring inside; the upper end of the battery compartment 22 is matched with the battery compartment cover through the slide groove; the self-reset switch 210 is fixed at the position of the housing 2 corresponding to the battery compartment 22. There is a small hole at the lower end of the battery compartment 22 to lead out the lead of the battery spring and connect the self-reset switch 23. When the self-reset switch 23 is pressed, the micro eccentric rotary motor starts to rotate, and the self-reset switch 23 will return to its original position after releasing it.

[0057] See also Figure 6 As shown, the present invention also provides a handheld LIBS spectrometer, which includes a spectrometer body 50 and the above-mentioned rotating test device 100. The sample cover gasket 12 of the rotating test device 100 is installed on the light outlet of the spectrometer body 50 and is sealed by a sealing ring.

[0058] It should be noted that a stepped groove is provided on the end surface of the sample cover gasket 12 corresponding to the light outlet of the spectrometer body 50, and a sealing ring can be installed on the large groove of the stepped groove. When in use, the distance from the sample press 40 to the sample cover gasket 12 is configured according to the set value of the focus point position of the matching spectrometer. When the trigger is triggered, the self-reset switch 23 is pressed, so that the eccentric motor 31 drives the sample press 40 to rotate eccentrically around the light outlet test port, and relatively stable spectral data can be obtained, thereby improving the instrument test accuracy.

[0059] In summary, the rotary testing device and handheld LIBS spectrometer of the present invention solve the problem that the current spectrometer cannot accurately collect spectral signals at different points and the collected spectral signals are unstable when testing powder tablet samples. At least the following technical effects are achieved:

[0060] (1) The design of the laser through hole 121 on the sample cover gasket 12 enables the laser to be accurately focused on the surface of the sample press 40. The rotating shaft of the eccentric motor 31 drives the sample cover 321 to rotate, and the sample press 40 rotates synchronously therewith, ensuring the stability of the sample during the test and reducing the error caused by sample movement during the measurement process. At the same time, the synchronous rotation of the rotating shafts of the sample press 40 and the eccentric motor 31 can make each laser pulse hit a different test point on the sample press 40, and the test point of the sample press 40 is controlled by controlling the rotation of the eccentric motor 31. Therefore, by eccentrically rotating around the test point, the problems of spectral intensity reduction and unstable algorithm results are overcome, greatly improving the accuracy and reliability of the measurement. The accuracy and stability of the measurement are enhanced.

[0061] (2) The fan assembly 13 is designed in combination with the turntable cover 11. An air suction port is provided on the mounting surface of the turbofan 131, and exhaust ports are provided on both sides of the turbofan 131. When the turbofan 131 is started, the gas in the cavity of the turntable cover 11 is sucked in and discharged to the external environment through the exhaust ports on both sides, which can achieve the effect of ventilation and heat dissipation, reduce the heat generated during operation, and improve the reliability and life of the equipment. At the same time, the powder generated by the sample tablet 40 irradiated by the laser can be discharged and discharged from the cavity by the turbofan 131 to avoid contaminating the optical path.

[0062] (3) The design of connecting the sample mounting assembly 32 and the rotating shaft of the eccentric motor 31 coaxially simplifies the mechanical structure of the device. The sample mounting assembly 32 includes a sample cover 321 and a sample fixing cover 322. The sample cover 321 and the sample fixing cover 322 are connected by magnetic attraction to ensure that the sample cover 321 remains vertical and does not fall during the rotation test. The magnetic attraction connection also makes it easy to disassemble and assemble, so that the sample cover 321 can be removed to replace the sample pressing sheet 40 in the sample cover 321, and it is easy to assemble and maintain.

[0063] (4) The rotating test device has a compact structure, integrating the table cover unit, the housing and the rotating unit into one, and combined with the use of a micro eccentric rotating motor, it is convenient for space utilization and portability, and is suitable for use in different occasions.

[0064] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

[0065] In the description herein, many specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more of the specific details or with other devices, systems, components, methods, components, materials, parts, etc. In other cases, well-known structures, materials, or operations are not specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

[0066] References throughout this specification to "one embodiment," "an embodiment," or "a specific embodiment" mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention, and not necessarily in all embodiments. Thus, various appearances of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout this specification do not necessarily refer to the same embodiment. In addition, the particular features, structures, or characteristics of any specific embodiment of the invention may be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the invention described and illustrated herein may be possible in light of the teachings herein and are to be considered part of the spirit and scope of the invention.

[0067] It should also be understood that one or more of the elements shown in the figures may also be implemented in a more separate or more integrated manner, or even removed because they are inoperable in certain circumstances or provided because they may be useful depending on the application.

[0068] In addition, unless otherwise explicitly indicated, any marking arrows in the drawings should be regarded as exemplary only and not limiting. In addition, unless otherwise indicated, the term "or" used herein is generally intended to mean "and / or". In the case where the term is not clear because it is anticipated that the ability to separate or combine is provided, the combination of components or steps will also be regarded as indicated.

[0069] As used in the description herein and throughout the claims that follow, "a," "an," and "the" include plural references unless otherwise indicated. Likewise, as used in the description herein and throughout the claims that follow, the meaning of "in" includes "in" and "on," unless otherwise indicated.

[0070] The above description of the illustrated embodiments of the present invention (including the contents described in the Abstract) is not intended to be an exhaustive list or to limit the present invention to the precise form disclosed herein. Although specific embodiments of the present invention and examples of the present invention are described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the present invention as will be recognized and appreciated by those skilled in the art. As noted, these modifications may be made to the present invention in accordance with the above description of the embodiments described in the present invention, and these modifications will be within the spirit and scope of the present invention.

[0071] Systems and methods have been generally described herein as details that aid in understanding the present invention. In addition, various specific details have been given to provide an overall understanding of embodiments of the present invention. However, those skilled in the relevant art will recognize that embodiments of the present invention may be practiced without one or more of the specific details, or may be practiced using other devices, systems, accessories, methods, components, materials, parts, etc. In other cases, well-known structures, materials, and / or operations are not specifically shown or described in detail to avoid confusion with various aspects of embodiments of the present invention.

[0072] Thus, although the invention has been described herein with reference to specific embodiments thereof, freedom of modification, various changes and substitutions are also within the foregoing disclosure, and it should be understood that in some cases, some features of the invention will be employed without the corresponding use of other features without departing from the scope and spirit of the proposed invention. Thus, many modifications may be made to adapt a particular environment or material to the essential scope and spirit of the invention. The invention is not intended to be limited to the specific terms used in the claims below and / or the specific embodiments disclosed as the best mode contemplated for carrying out the invention, but the invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Thus, the scope of the invention will be determined solely by the appended claims.

Claims

1. A rotation test device, characterized in that: include: case; A stage cover unit, the stage cover unit comprises a turntable cover and a sample cover gasket, the sample cover gasket is provided with a laser through hole, one end of the turntable cover is fixedly connected to the housing, and the other end is provided with the sample cover gasket; A rotating unit, the rotating unit comprising an eccentric motor and a sample mounting assembly, wherein the sample mounting assembly and the rotating shaft of the eccentric motor are coaxially connected; The sample mounting assembly passes through the cavity of the turntable cover and extends toward the sample cover gasket, and a sample pressing plate is installed at one end of the sample mounting assembly close to the sample cover gasket, and the eccentric motor drives the sample mounting assembly to rotate to drive the sample pressing plate to rotate synchronously.

2. The rotation test device according to claim 1, characterized in that: The table cover unit further comprises a fan assembly, which is mounted on two opposite sides of the turntable cover and is provided with an air suction port; Air outlets are arranged on both sides of the turntable cover where the fan assembly is mounted, and the air inlet and the air outlet are correspondingly connected.

3. The rotation test device according to claim 2, characterized in that: The laser through hole is located at the center of the sample cover gasket. A transverse groove is provided on a surface of the sample cover gasket close to the sample mounting assembly. The transverse groove extends along the diameter direction of the sample cover gasket, and the two ends of the transverse groove are respectively close to the two sides where the fan assembly is arranged.

4. The rotation test device according to claim 3, characterized in that: The turntable cover is coaxially sleeved outside the sample mounting assembly, and a gap is formed between the turntable cover and the sample mounting assembly.

5. The rotation test device according to claim 4, characterized in that: A positioning step is provided at one end of the turntable cover, and the sample cover gasket is arranged on the positioning step in cooperation with the sample cover gasket, and a gap is left between the sample cover gasket and the sample mounting assembly.

6. The rotation test device according to claim 5, characterized in that: The sample mounting assembly comprises: A sample fixing cover, wherein the sample fixing cover is connected to the rotating shaft of the eccentric motor; The sample cover is fixedly mounted on the sample fixing cover and arranged coaxially therewith, and the sample pressing sheet is pressed inside the end of the sample cover away from the sample fixing cover.

7. The rotation test device according to claim 6, characterized in that: The ends where the sample fixing cover and the sample cover are connected to each other are respectively provided with a first magnet and a second magnet with opposite magnetic properties.

8. The rotation test device according to claim 7, characterized in that: The housing comprises: A motor mounting shell, wherein the eccentric motor is mounted in the motor mounting shell, and a positioning boss is provided on the top surface of the motor mounting shell, and the positioning boss cooperates with the turntable cover for positioning; A battery compartment is fixedly connected to one side of the motor mounting shell.

9. The rotation test device according to claim 8, characterized in that: It also includes a reset switch, which is connected to the battery spring in the battery compartment.

10. A handheld LIBS spectrometer, characterized in that: It comprises a spectrometer body and a rotating test device as described in claims 1 to 9, wherein a sample cover gasket of the rotating test device is installed on the light outlet of the spectrometer body and is sealed by a sealing ring.

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