Automatic particle sample preparation system

Abstract

The invention relates to an automatic particle sample preparation system. The sample preparation system comprises an automatic sampler, a grinder and a cyclone separator, a sealed feeding groove is formed in the automatic sample feeding instrument, and a discharging opening of the sealed feeding groove is communicated with a feeding opening of a grinding cavity of the grinding instrument through a sealing hose; a grinding cavity discharge port of the grinding instrument is communicated to an air inlet of the cyclone separator, and an exhaust port of the cyclone separator is communicated to a grinding cavity feed port of the grinding instrument; and the bottom of the cyclone separator is communicated to a collecting barrel. The particle sample preparation system provided by the invention is used for early-stage treatment of laboratory samples, and the automatic sample injector conveys the samples to the grinding cavity in a sealing manner to prevent dust from drifting away. In the sample preparation process, air flow forms self-circulation, the sample loss caused by the fact that external negative pressure is connected with the cyclone separator is reduced, and therefore the loss rate in the whole preparation process is controlled; and no gas is leaked from the grinding cavity, so that no dust is prevented from overflowing.

Description

Technical Field

[0001] The present invention relates to the technical field of particulate sample preparation, and particularly relates to an automated particulate sample preparation system. Background Art

[0002] The particulate sample preparation device is used for the preliminary treatment of laboratory samples. Existing grinders can achieve the grinding and pulverization of most samples, but they have many defects: existing grinders cannot grind some slightly hard samples (such as non-ferrous metal ore powder) to pass 200 mesh with 99% fineness. Sticky and light samples are prone to clogging the sieve mesh and cannot be smoothly prepared. Moreover, a lot of powdered samples will adhere to the accessories after the sample preparation is completed, which requires manual cleaning, is time-consuming and laborious, seriously affects the sample preparation efficiency, and the loss rate during the preparation process is relatively high, usually 3%-5%. There is dust dispersion during the sample preparation process, which pollutes the environment and affects the health of operators. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an automated particulate sample preparation system in view of the above deficiencies.

[0004] The present invention is realized through the following technical solutions: An automated particulate sample preparation system, which includes an automatic sampler, a grinder, and a cyclone separator; a sealed feed trough is provided on the automatic sampler, and the discharge port of the sealed feed trough is connected to the feed port of the grinding chamber of the grinder through a sealed hose; the automatic sampler evenly transports the sample to be prepared in the sealed feed trough into the grinding chamber of the grinder through high-frequency electromagnetic vibration; the discharge port of the grinding chamber of the grinder is connected to the air inlet of the cyclone separator, and the exhaust port of the cyclone separator is connected to the feed port of the grinding chamber of the grinder; the rotating cutter in the grinding chamber rotates at a high speed to crush the sample to be prepared, and at the same time forms an air flow to drive the crushed sample into the cyclone separator for separation and collection, and an air flow cycle is formed between the cyclone separator and the grinding chamber; the bottom of the cyclone separator is connected to a collection bucket.

[0005] Furthermore, for the described automated particle sample preparation system, the sample preparation system further includes a pneumatic vibrator, an air compressor, and a negative pressure feeder; the air outlet of the air compressor is connected to the grinding chamber, the outlet of the grinding chamber, and the cyclone separator; the negative pressure feeder is connected to the exhaust port of the cyclone separator through a cleaning purge pipeline and a valve; the pneumatic vibrator is arranged on the pipeline connecting the exhaust port of the cyclone separator and the feed port of the grinding chamber of the grinder; in the purge cleaning mode, the pneumatic vibrator shakes off the powdered sample adsorbed in the pipeline, and at the same time, the sample preparation system purges and cleans the grinding chamber, the outlet of the grinding chamber, and the cyclone separator in sequence. The purged sample is collected into the collection bucket through the cyclone separator.

[0006] Furthermore, for the described automated particle sample preparation system, purge hoses are arranged in the grinding chamber, the outlet of the grinding chamber, and the cyclone separator. One end of the purge hose is connected to the air outlet of the air compressor, and the other end of the purge hose is a free end; after high-pressure gas is introduced into the purge hose, it will swing disorderly to purge and clean the inside of the grinding chamber, the outlet of the grinding chamber, and the cyclone separator.

[0007] Furthermore, for the described automated particle sample preparation system, an annular sieve is arranged in the grinding chamber. The shaft of the rotating blade extends into the annular sieve through one side of the annular sieve, the rotating blade is installed on the shaft, and the other side of the annular sieve is the feed port of the grinding chamber.

[0008] Furthermore, for the described automated particle sample preparation system, both sides of the annular sieve are fixed in the grinding chamber through annular sieve fixing frames respectively, and a sealing soft pad is arranged between one of the annular sieve fixing frames and the inner side wall of the grinding chamber.

[0009] Furthermore, for the described automated particle sample preparation system, the rotating blade is a turbine rotating blade with a number of blades extending outward along its central axis and having an inclined arc along its rotation direction.

[0010] Furthermore, for the described automated particle sample preparation system, avoidance grooves for avoiding the inner edges of the two annular sieve fixing frames are arranged on both sides of the edge of the blade; the inner edges of the outer annular sieve fixing frames are provided with a number of rotating blade installation grooves corresponding to the number of blades.

[0011] Furthermore, for the described automated particle sample preparation system, a number of slit holes are arranged in a matrix distribution on the annular sieve.

[0012] Furthermore, for the described automated particle sample preparation system, one end of the purge hose is connected to the air outlet of the air compressor through a quick-release joint.

[0013] Furthermore, for the automated particle sample preparation system described above, the rotating cutter is treated with laser cladding tungsten carbide.

[0014] The advantages and effects of the present invention are as follows: 1. The particle sample preparation system provided by the present invention is used for the preliminary treatment of laboratory samples. It can prepare various samples, including slightly sticky and light samples, and is widely applied in the fields of non-ferrous metals, agriculture, medicine, new materials, geology and minerals, etc. The automatic sampler of this preparation system transports the sample to the grinding chamber in a sealed form, preventing dust from spreading. During the sample preparation process, the rotating air flow of the rotating cutter in the grinding chamber enters the cyclone separator through the annular screen from the discharge port of the grinding chamber, and then enters the feed port of the grinding chamber from the exhaust port of the cyclone separator to form a self-circulation, reducing the sample loss caused by the external negative pressure connecting the cyclone separator, thereby controlling the loss rate during the whole preparation process; and no gas leaks from the grinding chamber, ensuring no dust spillage.

[0015] 2. The particle sample preparation system provided by the present invention is provided with a purging and cleaning function, which can purge and clean the grinding chamber, the discharge port of the grinding chamber and the cyclone separator without dead angles of 360 degrees, shake off the powdery samples adsorbed in the pipeline, prevent sample cross-contamination, and can collect the cleaned samples, reducing the loss rate during the sample preparation process and keeping the loss rate within 1%.

[0016] 3. The structure of the rotating cutter and the annular screen in the grinding chamber of the particle sample preparation system provided by the present invention reduces the distance between the rotating cutter and the annular screen, increases the grinding and crushing effect, can crush and grind the particle sample into powder with a mesh size of 200 or even finer, solves the problem of sieving rate, and improves the service life of the annular screen and the rotating cutter. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Showing the structural schematic diagram of the particle sample preparation system provided by the present invention; Figure 2 Showing the structural schematic diagram of the particle sample preparation system provided by the present invention from another angle; Figure 3 Showing the structural schematic diagram of the grinding chamber of the particle sample preparation system provided by the present invention; Figure 4 Showing the structural schematic diagram of the annular screen and the annular screen fixing frame of the particle sample preparation system provided by the present invention; Figure 5 Showing the connection cross-sectional view of the annular screen and the annular screen fixing frame of the particle sample preparation system provided by the present invention; Figure 6 Showing the structural schematic diagram of the purging hose of the particle sample preparation system provided by the present invention.

[0018] Description of the drawing reference numerals: 1 - Automatic sampler, 2 - Grinder, 21 - Grinding chamber, 22 - Purge hose, 23 - Annular screen, 24 - Rotary cutter, 25 - Annular screen fixing frame, 26 - Sealing soft pad, 27 - Avoidance groove, 28 - Slot hole, 29 - Quick-connect fitting, 30 - Annular groove, 31 - Bolt hole, 32 - Connecting rod, 33 - Rotary cutter mounting groove, 3 - Cyclone separator, 4 - Sealed feed trough, 5 - Sealing hose, 6 - Collection bucket, 7 - Pneumatic vibrator, 8 - Air compressor, 9 - Negative pressure feeder, 10 - Feed funnel, 11 - Cleaning and purging pipeline, 12 - Valve, 13 - Pipeline. Detailed implementation manners

[0019] To make the purposes, technical solutions and advantages of the implementation of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present invention. The embodiments of the present invention will be described in detail below with reference to the accompanying drawings: In the description of the present invention, it should be understood that unless otherwise specified, the meaning of "a plurality of" is two or more; the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the scope of protection of the present invention. In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] An automatic sampler is an intelligent and automated sampling instrument. By simply setting the sampling parameters and placing the sample to be prepared, the automatic sampling process can be completed. The automatic sampler in this application is an instrument that evenly transports the sample to be prepared in the sealed feed trough to the grinding chamber of the grinder through high-frequency electromagnetic vibration.

[0021] A negative pressure feeder is a conveying device that conveys granular and powdery materials by means of vacuum suction.

[0022] An air compressor is a machine that compresses gas into high-pressure gas. When the stored gas is needed, it can be released through a pipeline and used in various applications.

[0023] A cyclone separator is a device used for the separation of gas-solid systems or liquid-solid systems. It relies on the rotational motion caused by the tangential introduction of the gas flow to separate solid particles or liquid droplets with a large inertial centrifugal force to the outer wall surface.

[0024] Figure 1 、 Figure 2 The structural schematic diagram of the particle sample preparation system provided by the present invention is shown. The automated particle sample preparation system includes an autosampler 1, a grinder 2, and a cyclone separator 3. A sealed feed trough 4 is provided on the autosampler 1, a feed funnel 10 is arranged above the sealed feed trough 4, the grinder 2 is arranged below the autosampler 1, and the cyclone separator 3 is arranged obliquely below the grinder 2. The feed funnel 10 communicates with the feed port of the sealed feed trough 4, and the discharge port of the sealed feed trough 4 is connected to the grinding chamber feed port of the grinder 2 through a sealed hose 5. The sample to be prepared enters the sealed feed trough 4 through the feed funnel 10, and the autosampler 1 evenly transports the sample to be prepared in the sealed feed trough 4 to the grinding chamber 21 of the grinder 2 through the sealed hose 5 and the grinding chamber feed port by high-frequency electromagnetic vibration for crushing. The sealed hose 5 connected between the discharge port of the sealed feed trough 4 and the grinding chamber feed port ensures sealing while not affecting the high-frequency vibration feeding of the autosampler 1. The discharge port of the grinding chamber of the grinder 2 communicates with the air inlet of the cyclone separator 3, and the exhaust port of the cyclone separator 3 communicates with the grinding chamber feed port of the grinder 2. The air inlet of the cyclone separator 3 is arranged at the upper end of the side of the cyclone separator 3, the exhaust port of the cyclone separator 3 is arranged at the top of the cyclone separator 3, and the bottom of the cyclone separator 3 communicates with the collection bucket 6. The rotating knife in the grinding chamber 21 rotates at a high speed to crush the sample to be prepared, and at the same time forms an air flow to drive the crushed sample into the cyclone separator 3. The air flow forms a tangential air flow in the cyclone separator 3 to separate and collect the crushed sample into the collection bucket 6, and an air flow cycle is formed between the cyclone separator 3 and the grinding chamber 21. In this process, the loss of overly fine and light samples during crushing is avoided, and at the same time, the high-speed air flow promotes the sample to quickly pass through the annular sieve, improving the working efficiency and preventing the sample from blocking the annular sieve.

[0025] The automated particle sample preparation system also has a purging and cleaning function, which includes a pneumatic vibrator 7, an air compressor 8, and a negative pressure feeder 9. The air outlet of the air compressor 8 is connected to the grinding chamber 21, the grinding chamber discharge port, and inside the cyclone separator 3 (not shown in the figure). The suction port of the negative pressure feeder 9 is connected to the exhaust port of the cyclone separator 3 through a cleaning and purging pipeline 11 and a valve 12. The pneumatic vibrator 7 is arranged on the pipeline 13 connecting the exhaust port of the cyclone separator 3 and the grinding chamber feed port of the grinder 2. As Figure 3 shown, at least one purging hose 22 is provided inside the grinding chamber 21, the grinding chamber discharge port, and the cyclone separator 3. The air outlet of the air compressor 8 is connected to one end of the purging hose 22. The other end of the purging hose 22 is a free end. After the purging hose 22 is introduced with high-pressure gas by the air compressor 8, its free end will swing disorderly to purge and clean the inside of the grinding chamber 21, the grinding chamber discharge port, and the cyclone separator 3. Specifically, the air compressor 8 is connected to the purging points inside the grinding chamber 21, the grinding chamber discharge port, and the cyclone separator 3 through a pressure reducing valve and a solenoid valve. The purging hose is connected to the purging point. A number of purging points can be commonly connected to the air compressor through a solenoid valve to control the introduction of high-pressure gas simultaneously, or can be separately connected to solenoid valves to control the introduction of high-pressure gas in batches. As Figure 6 shown, one end of the purging hose 22 is connected to the air outlet of the air compressor 8 through a quick-release joint 29 and is connected to the purging points inside the grinding chamber 21, the grinding chamber discharge port, and the cyclone separator 3, and can be conveniently replaced if damaged.

[0026] In the purging and cleaning mode, the pneumatic vibrator 7 shakes off the powdered sample adsorbed in the pipeline 13. At the same time, high-pressure gas purges and cleans the grinding chamber 21, the grinding chamber discharge port, and the cyclone separator 3 in sequence. The purged sample is collected into the collection bucket 6 through the cyclone separator 3. The high-pressure gas passes through the cyclone separator 3 and then enters the negative pressure feeder 9 through the cleaning and purging pipeline 11 and the valve 12 and is discharged. During this process, most of the residual samples will be collected by the cyclone separator after cleaning, and only a small amount of powdered samples will be sucked away and lost by the negative pressure feeder, thus greatly reducing the loss rate of sample preparation.

[0027] As Figure 3As shown, the side of the grinding chamber 21 has an opening for the installation of the ring sieve assembly and the rotating cutter inside it. The opening side of the grinding chamber 21 is the outside of the grinding chamber 21, and the opposite side of its outside is the inside of the grinding chamber 21. An annular sieve 23 and a rotating cutter 24 are arranged inside the grinding chamber 21. Both the annular sieve 23 and the rotating cutter 24 are installed inside the grinding chamber 21 through the outside opening of the grinding chamber 21. The power shaft of the rotating cutter 24 extends into the grinding chamber 21 through the inside of the grinding chamber 21, and the rotating cutter 24 is installed on the power shaft through the outside opening of the grinding chamber 21. One side of the annular sieve 23 is close to the inside of the grinding chamber 21, and the power shaft of the rotating cutter 24 extends into the annular sieve 23 at the same time. The other side of the annular sieve 23 (in the same plane as the opening side of the grinding chamber) is the feed inlet of the grinding chamber. A grinding chamber door is arranged on the opening side of the grinding chamber 21, and the pipeline 13 is connected to the feed inlet of the grinding chamber through the grinding chamber door. Specifically, the pipeline 13 extends upward from the exhaust port of the cyclone separator 3 to a position higher than the feed inlet of the grinding chamber, and then extends downward to the feed inlet of the grinding chamber. That is, the pipeline 13 has an upward extending part, a middle arc part, and a downward extending part that are connected end to end. The upward extending part and the downward extending part of the pipeline 13 are hard pipelines, preferably stainless steel pipes, and the middle arc part of the pipeline 13 is a flexible pipe, which is convenient for the opening and closing and disassembly of the grinding chamber door. The pneumatic vibrator 7 is arranged on the upward extending part of the pipeline 13.

[0028] Both sides of the annular sieve 23 are installed inside the grinding chamber 21 through the ring sieve fixing frames 25 respectively. Specifically, as Figure 4 , Figure 5 shown, the two ring sieve fixing frames 25 and the annular sieve 23 form a cylinder. The annular sieve 23 is the side surface of this cylinder, and the two ring sieve fixing frames 25 are the two bottom surfaces of this cylinder respectively. And the ring sieve fixing frame 25 is an annular frame with an outer edge and an inner edge. Annular grooves 30 for the upper and lower ring edges of the annular sieve 23 to be embedded are respectively arranged on the opposite surfaces of the two ring sieve fixing frames 25. A number of pairs of corresponding bolt holes 31 are arranged outside the annular grooves 30 of the two ring sieve fixing frames 25. The upper and lower ring edges of the annular sieve 23 are embedded in the annular grooves 30 of the two ring sieve fixing frames 25, and a number of pairs of bolts respectively pass through the corresponding bolt holes 31 of the two ring sieve fixing frames 25 and are connected to both ends of the corresponding connecting rod 32, so that the annular sieve 23 is fixed between the two ring sieve fixing frames 25 to form a ring sieve assembly, and then it is installed inside the grinding chamber 21 through the outside opening of the grinding chamber 21. The purging hose 22 inside the grinding chamber 21 is arranged between the inner wall of the grinding chamber 21 and the annular sieve 23. A sealing soft pad 26 is arranged between the ring sieve fixing frame 25 on one side of the annular sieve 23 and the inner side wall of the grinding chamber 21. The sealing soft pad 26 is bonded to the back of the ring sieve fixing frame 25 and is completely attached to the inner side wall of the grinding chamber 21 to eliminate gaps, reducing the residue of the sample.

[0029] As Figure 3As shown, the rotating cutter 24 is a turbine rotating cutter that extends several blades outward along its central axis with an inclined arc in the rotating direction. Preferably, the turbine rotating cutter has 6 blades evenly distributed. The edge of the blade is as close as possible to the annular screen 23, with a gap left. Due to the installation structure of the annular screen fixing frame 25 and the annular screen 23, the inner edge of the annular screen fixing frame 25 protrudes, and avoidance grooves 27 for avoiding the inner edges of the two annular screen fixing frames 25 are provided on both sides of the blade edge, so that the gap between the rotating cutter 24 and the annular screen assembly is infinitely reduced, greatly improving the crushing efficiency of the sample and the fineness limit of the sample. The inner edge of the outer annular screen fixing frame 25 is provided with several rotating cutter installation grooves corresponding to several blades, facilitating the installation of the rotating cutter 24 through the outer annular screen fixing frame 25 on the power shaft in the grinding chamber 21 (annular screen 23).

[0030] The rotating cutter 24 is treated by laser cladding tungsten carbide, increasing the surface hardness and improving the service life. As Figure 4 , Figure 5 shown, the annular screen 23 is provided with several slit holes 28 in a matrix distribution. The slit holes are not limited by the material thickness and hardness, and laser processing can be used with a thicker and wear-resistant plate. When the sample is crushed, the discharge is easier than that of round holes. The distribution of several slit holes 28 can be diagonal, horizontal or vertical.

[0031] The working process of the automatic particle sample preparation system: Sample preparation mode: The sample to be prepared enters the sealed feeding trough 4 through the feeding funnel 10. The automatic sampler 1 evenly transports the sample to be prepared in the sealed feeding trough 4 through the sealed hose 5 and the grinding chamber feeding port to the grinding chamber 21 of the grinder 2 by high-frequency electromagnetic vibration. The rotating cutter 24 in the grinding chamber 21 rotates at a high speed to crush the sample to be prepared, and at the same time forms an air flow to drive the crushed sample through the annular screen 23, the grinding chamber discharge port and the air inlet of the cyclone separator 3 into the cyclone separator 3. The above air flow forms a tangential air flow in the cyclone separator 3 to separate and collect the crushed sample into the collection bucket 6, and an air flow cycle is formed between the cyclone separator 3 and the grinding chamber 21.

[0032] Purge and cleaning mode: After the sample preparation is completed, click the stop button, and the system automatically enters the purge and cleaning mode. Open the negative pressure feeder 9, valve 12 and air compressor 8. The pneumatic vibrator 7 vibrates and shakes off the powdered sample adsorbed in the pipeline 13, and the air compressor 8 passes high-pressure gas to purge the grinding chamber, the grinding chamber discharge port and the cyclone separator in sequence. During the entire purge process, the sample is collected into the collection bucket 6 through the cyclone separator 3, and the high-pressure gas entering the particle sample preparation system passes through the cyclone separator 3 and then through the cleaning purge pipeline 11 and valve 12 and enters the negative pressure feeder 9 for discharge. During this process, most of the residual samples are collected by the cyclone separator 3 after cleaning, and only a small amount of powdered samples will be sucked away and lost by the negative pressure feeder.

[0033] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of implementation of the present invention. Any equivalent changes and modifications made within the protection scope of the present invention shall be considered to fall within the protection scope of the present invention.

Claims

1. An automated particle sample preparation system, characterized in that: The sample preparation system comprises an automatic sample injector (1), a grinder (2) and a cyclone separator (3); the automatic sample injector (1) is provided with a sealed feed slot (4), the feed outlet of the sealed feed slot (4) is connected to the feed outlet of the grinding chamber of the grinder (2) through a sealed hose (5); the automatic sample injector (1) uniformly transports the sample to be prepared in the sealed feed slot (4) into the grinding chamber (21) of the grinder (2) through high-frequency electromagnetic vibration; the grinding chamber (2) of the grinder (2) is connected to the feed outlet of the grinding chamber (21) of the grinder (2) through a sealed hose (5) The grinding chamber discharge port is connected to the air inlet of the cyclone separator (3), and the exhaust port of the cyclone separator (3) is connected to the grinding chamber feed port of the grinder (2); the rotary cutter in the grinding chamber (21) rotates at high speed to crush the sample to be prepared, and at the same time, an air flow is formed to drive the crushed sample into the cyclone separator (3) for separation and collection, and an air flow circulation is formed between the cyclone separator (3) and the grinding chamber (21); the bottom of the cyclone separator (3) is connected to the collection bucket (6).

2. The automated particle sample preparation system according to claim 1, characterized in that: The sample preparation system further comprises a pneumatic vibrator (7), an air compressor (8) and a negative pressure feeder (9); the air outlet of the air compressor (8) is connected to the grinding chamber (21), the grinding chamber outlet and the cyclone separator (3), and the negative pressure feeder (9) is connected to the exhaust port of the cyclone separator (3) via a cleaning purge pipe (11) and a valve (12); the pneumatic vibrator (7) is arranged on a pipe (13) connected between the exhaust port of the cyclone separator (3) and the grinding chamber feed port of the grinder (2); in a purge cleaning mode, the pneumatic vibrator (7) shakes off the powdered sample adsorbed in the pipe (13), and at the same time, the air compressor (8) sequentially purges and cleans the grinding chamber (21), the grinding chamber outlet and the cyclone separator (3), and the purged sample is collected into the collection bucket (6) via the cyclone separator (3).

3. The automated particle sample preparation system according to claim 2, characterized in that: A purge hose (22) is arranged in the grinding chamber (21), the grinding chamber discharge port and the cyclone separator (3); the air outlet of the air compressor (8) is connected to one end of the purge hose (22), and the other end of the purge hose (22) is a free end; after the high-pressure gas is introduced into the purge hose (22), it will swing in a disorderly manner to purge and clean the grinding chamber (21), the grinding chamber discharge port and the cyclone separator (3).

4. An automated particle sample preparation system according to any one of claims 1 to 3, characterized in that: An annular screen (23) is arranged in the grinding chamber (21); a power shaft of the rotary cutter (24) extends into the annular screen (23) through one side of the annular screen (23); the rotary cutter (24) is mounted on the power shaft; and the other side of the annular screen (23) is a feeding port of the grinding chamber.

5. The automated particle sample preparation system according to claim 4, characterized in that: Both sides of the annular screen (23) are respectively installed in the grinding chamber (21) through annular screen fixing frames (25), and a sealing cushion (26) is arranged between the inner annular screen fixing frame (25) and the inner wall of the grinding chamber (21).

6. The automated particle sample preparation system according to claim 5, characterized in that: The rotary cutter (24) is a turbine rotary cutter having a plurality of blades extending outward from its central axis and in an inclined arc along its rotation direction.

7. The automated particle sample preparation system according to claim 6, characterized in that: Avoidance grooves (27) are arranged on both sides of the blade edge to avoid the inner edges of the two ring screen fixing frames (25); and a plurality of rotary blade mounting grooves (33) corresponding to the plurality of blades are arranged on the inner edge of the outer ring screen fixing frame (25).

8. The automated particle sample preparation system according to claim 4, characterized in that: The annular screen is provided with a plurality of slot holes (28) distributed in a matrix manner.

9. The automated particle sample preparation system according to claim 3, characterized in that: One end of the purge hose (22) is connected to the air outlet of the air compressor (8) via a quick-tightening connector (29).

10. An automated particle sample preparation system according to any one of claims 1 to 3, characterized in that: The rotary cutter (24) is processed by laser cladding of tungsten carbide.

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