Sampling device and jet mill with same

Abstract

The utility model relates to the technical field of airflow mill pipeline sampling, and discloses a sampling device and an airflow mill with the sampling device, the sampling device comprises a sampling piece, the sampling piece is internally provided with a sampling cavity used for containing materials, the sampling cavity is provided with a sample inlet and an openable sample outlet, and the sample inlet is suitable for being communicated with the sampling opening; the sampling piece is further provided with a purging opening, the purging opening is communicated with the sampling cavity, and the purging opening is suitable for being communicated with purging gas. According to the sampling device provided by the utility model, when sampling is needed, the sample inlet of the sampling cavity is connected with the sampling port of the jet mill, and materials enter the cavity to be temporarily stored for subsequent detection. After sampling is completed, materials can be conveniently taken through the sample outlet. The purging opening is communicated with the sampling cavity, residues are cleaned through compressed air after sampling, a sampling piece is kept clean, production monitoring and quality control of the jet mill are facilitated, and the problem that materials remaining at the sampling opening are inconvenient to clean after sampling of an existing sampling device is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to airflow mill pipeline sampling technical field, concretely relates to a sampling device and have its airflow mill. BACKGROUND

[0002] Airflow mill is a kind of equipment using compressed air to realize dry material ultrafine grinding, and its working principle is that material enters the crushing chamber through uniform feeding system, compressed air is high-speed injected through supersonic nozzle to accelerate material and impact and crush at nozzle intersection, and crushed material enters classifier along airflow, and coarse and fine particles are separated by rotating classifier rotor, and fine particles are collected, and gas is discharged.

[0003] However, in actual production, with the development of technology, the crushing of high-viscosity materials such as asphalt and tar mixture is more and more common, and the adhesion of such materials is easily affected by factors such as temperature and humidity. Therefore, sampling analysis of materials is crucial for monitoring of production process, equipment debugging and troubleshooting.

[0004] The existing sampling device for airflow mill pressure pipeline completes sampling of material by inserting the segmented sampler from the outside of the airflow mill pipeline into the inside.

[0005] However, the existing sampling device needs to insert the sampling probe into the airflow mill cavity during sampling, which will interfere with the normal circulation of the host airflow and the movement trajectory of the material, thereby affecting the crushing effect of the host airflow, and the material remaining in the sampling port during sampling is inconvenient to clean. INVENTION CONTENTS

[0006] Therefore, the utility model provides a kind of sampling device and have its airflow mill to solve the problem of inconvenient cleaning of material remaining in the sampling port after sampling of the existing sampling device.

[0007] The utility model provides a kind of sampling device, comprising: sampling piece, the inside of the sampling piece has the sampling cavity for accommodating material, the sampling cavity has sample inlet and openable sample outlet, the sample inlet is suitable for communicating with sampling port;Sweeping port is further equipped on the sampling piece, and the sweeping port communicates with the sampling cavity, and the sweeping port is suitable for communicating with sweep gas.

[0008] Through the above setting, the sample inlet of the sampling cavity is communicated with the sampling port of the device to be sampled, so that the material can smoothly enter the sampling cavity. When sampling is needed, the material enters the sampling cavity through the sample inlet, and the sampling operation is completed. The openable sample outlet design facilitates the removal of the material for analysis after the sampling is completed. The purge port provided on the sampling member is communicated with the sampling cavity, and the purge port is adapted to be communicated with the purge gas. After the sampling is completed, the compressed gas is introduced through the purge port, which can effectively clean the material remaining in the sampling cavity. This solves the problem that the material remains in the sampling port during the sampling process of the existing sampling device, which is not convenient to clean.

[0009] Optionally, the sampling cavity comprises a sampling cavity and a sample storage cavity communicated in sequence, the sampling cavity has a sampling port, and the sample storage cavity has a sample outlet.

[0010] Through the above setting, the sampling cavity is responsible for receiving the material from the outside, and the sampling port can accurately dock with the sampling port, ensuring that the material can efficiently enter the sampling device. When the material enters the sampling cavity, due to the communication relationship between the sampling cavity and the sample storage cavity, the material will gradually transfer to the sample storage cavity. The sample storage cavity has a sample outlet, so that the material has a relatively independent and stable temporary storage space during sampling. During sampling, the sampling cavity can buffer the impact of the material entering to a certain extent, avoiding the splashing or uneven distribution of the material caused by the direct impact of the material on the sample storage cavity.

[0011] Optionally, the sampling cavity and the sample storage cavity are coaxially arranged.

[0012] Through the above setting, the coaxial layout ensures that the material transmission path is linear, reducing the resistance and energy loss that may be generated due to turning or deviation. It is beneficial to improve the efficiency of the material entering the sample storage cavity, avoid the phenomenon of jamming or accumulation of the material during transmission, and ensure the continuity and stability of the sampling process. The coaxial arrangement also facilitates the installation and positioning of the entire sampling device, so that it can be more accurately docked when connected with the airflow mill body and related components, which helps to improve the cooperative working performance of the entire system, further optimizes the convenience and accuracy of the sampling operation.

[0013] Optionally, the sampling cavity and the sample storage cavity are communicated through a throttling channel.

[0014] Through the above setting, the throttling channel can effectively control the speed of the material flowing from the sampling cavity to the sample storage cavity. When the material enters the sampling cavity, the throttling channel limits the speed of the material flowing into the sample storage cavity, avoiding the impact on the sample storage cavity caused by the too fast flow of the material, and preventing the material from splashing, rebounding and other unstable phenomena in the sample storage cavity, ensuring that the material can be relatively stably deposited and temporarily stored in the sample storage cavity.

[0015] Optionally, at least a portion of the sample inlet cavity and the sample storage cavity near the throttling passage is tapered towards the throttling passage.

[0016] Through the above arrangement, in the process of material flowing from the sample inlet cavity to the sample storage cavity, the tapered structure helps to guide the material to flow more concentratedly to the throttling passage, improving the accuracy and smoothness of the material entering the throttling passage. When the material is in the sample inlet cavity, the tapered structure can form a certain pressure near the throttling passage, prompting the material to pass through the throttling passage more smoothly into the sample storage cavity, reducing the risk of material accumulation or stagnation at the entrance of the passage.

[0017] Optionally, the purge port is in communication with the sample storage cavity.

[0018] Through the above arrangement, after sampling is completed, when the purge gas enters from the purge port, it can efficiently purge and clean the residual material in the sample storage cavity due to its direct communication with the sample storage cavity. As the main space for temporarily storing material, the sample storage cavity is prone to residual material. Through this direct communication method, the material in the sample storage cavity can be quickly blown away, ensuring the cleanliness of the inside of the sample storage cavity.

[0019] Optionally, the purge port is perpendicular to the central axis of the sampling cavity.

[0020] Through the above arrangement, when the purge gas enters the sampling cavity from the vertical direction, it can form a more comprehensive and uniform purging effect inside the sampling cavity. Compared with the arrangement of the purge port in the central axis direction or other non-vertical directions, the vertically entering purge gas can better cover all areas of the sampling cavity, including the sidewall, the bottom, and the corners where material is prone to accumulate.

[0021] Optionally, a rear cover is detachably connected to the sampling member at the sample outlet.

[0022] Through the above arrangement, during sampling, the rear cover can tightly close the sample outlet, preventing accidental leakage of material under incomplete sampling or other unintended circumstances, ensuring the sealing and stability of the sampling process. When it is necessary to take out the material in the sampling cavity for analysis and detection, the detachable rear cover can be conveniently and quickly opened, allowing the operator to easily obtain the material sample in the sample storage cavity, facilitating subsequent processing and research, prolonging the service life of the sampling device, reducing maintenance costs, and improving the efficiency and reliability of the entire sampling work.

[0023] The utility model also provides an airflow mill, include: airflow mill body and any one of the sampling device in above-mentioned scheme, the sampling port of airflow mill body, the valve is connected to the sampling port, the sampling device is connected to the outlet of valve.

[0024] Through the above setting, the valve connected at the sampling port can effectively control the opening and closing of the sampling process, when sampling is needed, the valve can be opened, so that the material in the airflow mill body can flow to the sampling device through the sampling port, and when normal production is running, closing the valve can ensure that the airflow environment and material processing process in the airflow mill body are not affected, and the stable operation of the equipment is maintained. The whole sampling process is carried out in the sampling cavity, without inserting the material sampling probe into the airflow mill cavity, which will not interfere with the normal circulation of the main machine airflow and the movement track of the material, thereby avoiding the influence on the crushing effect of the main machine airflow.

[0025] Optionally, the observation port on the vertical side wall of the airflow mill body is used as the sampling port, and the valve is a gate valve.

[0026] Through the above setting, the position of the observation port itself is usually convenient for the operator to observe the internal situation of the equipment, and the observation port is reused as the sampling port, which fully utilizes the existing structural characteristics of the equipment, without the need to additionally open a special sampling channel on the airflow mill body, thereby reducing the modification of the overall structure of the equipment and reducing the complexity and cost of the equipment modification. The gate valve has the characteristics of simple structure, good sealing performance and convenient operation. In the sampling process, the gate valve can be quickly and accurately opened and closed to effectively control the flow of the material. When sampling is needed, the gate valve is easily opened, so that the material can smoothly flow from the observation port (sampling port) to the sampling device; after sampling is completed, the gate valve is quickly closed to immediately prevent the material from continuing to flow out, ensure the stability of the internal environment of the airflow mill, prevent the material from leaking or external impurities from entering the internal equipment, thereby ensuring the normal operation of the airflow mill and the convenience, efficiency and reliability of the sampling operation. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0028] Figure 1 is a cross-sectional view of one specific embodiment of the sampling device provided in the embodiments of the present application;

[0029] Figure 2 is a front view of one specific embodiment of the airflow mill provided in the embodiments of the present application;

[0030] Figure 3 is a front view of one specific embodiment of the valve in the airflow mill provided in the embodiments of the present application.

[0031] Reference numerals:

[0032] 1, sample inlet; 2, sample outlet; 3, purge port; 4, sample inlet cavity; 5, sample storage cavity; 6, throttling channel; 7, rear cover; 8, feed inlet; 9, jet mill main machine; 10, annular airflow gas pocket distribution chamber; 11, high-pressure pipe; 12, compressed air inlet; 13, main machine cleaning port; 14, classifier cavity; 15, discharge port; 16, motor; 17, observation port; 18, gate valve. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0034] The embodiments of the present application will be described below with reference to Figures 1 to 3 .

[0035] As shown in Figure 1 , a specific embodiment of the sampling device provided by the present embodiment comprises a sampling member and a purge port 3 arranged on the sampling member.

[0036] Specifically, the sampling member has a sampling cavity inside for accommodating materials, the sampling cavity has a sample inlet 1 and an openable sample outlet 2, the sample inlet 1 is adapted to communicate with a sampling port; the sampling member is further provided with a purge port 3, the purge port 3 communicates with the sampling cavity, and the purge port 3 is adapted to communicate with a purge gas.

[0037] In the present embodiment, the sampling member is the core component, and the sampling cavity inside the sampling member provides a temporary storage space for materials. The sample inlet 1 communicates with the sampling port of the jet mill body, so that the materials can smoothly enter the sampling cavity at the appropriate time. The openable sample outlet 2 provides a convenient channel for taking out the materials in the sampling cavity. After sampling is completed, the operator can conveniently open the sample outlet 2 to take out the collected materials for subsequent analysis and detection operations. When the sampling is completed, the compressed air enters the sampling cavity through the purge port 3 at a certain pressure and flow rate, and performs strong purging on the materials remaining in the cavity, effectively removing the material residues attached to the cavity wall, corners and other parts. The cleaning of the sampling cavity after each sampling is ensured, the interference and pollution of the material residues on the next sampling are avoided, and the stability of the sampling device is maintained, and the service life is prolonged.

[0038] As shown in Figure 1As shown, this is a specific implementation of the sampling device provided in this embodiment. The sampling chamber includes a sample inlet chamber 4 and a sample storage chamber 5 connected in sequence. The sample inlet chamber 4 has a sample inlet 1, and the sample storage chamber 5 has a sample outlet 2.

[0039] Specifically, the sample inlet chamber 4 serves as the first station for materials entering the sampling device. Its inlet 1 directly connects to the external sampling port, receiving materials from inside the air jet mill. After entering the sample inlet chamber 4, due to its connection with the storage chamber 5, the material gradually moves towards the storage chamber 5 under a certain power drive. The main function of the storage chamber 5 is to provide a relatively stable and independent temporary storage space for the material. During the process of material flowing from the sample inlet chamber 4 to the storage chamber 5, the sample inlet chamber 4 acts as a preliminary buffer, preventing the material from directly impacting the storage chamber 5 and causing adverse phenomena such as material splashing and uneven distribution. After sampling, the operator can easily remove the material completely from the storage chamber 5 by opening the outlet 2 for subsequent operations such as component analysis and particle size detection.

[0040] It should be noted that this embodiment does not impose any size restrictions on the sample inlet chamber 4 and the sample storage chamber 5. The size requirements vary depending on the production scenario and material characteristics. When processing large particles and high-flow-rate materials, increasing the volume of the sample inlet chamber 4 can effectively buffer the material entry, prevent blockage or overflow, and ensure smooth feeding. Regarding the sample storage chamber 5, for long-term, multi-batch continuous sampling, a larger sample storage chamber 5 can store more samples, reducing cleaning and interruptions and improving efficiency. Conversely, for small particles, low-flow-rate, and low-frequency sampling, a smaller chamber can reduce the device's size and cost, ensuring accurate sampling of small samples. This design is highly flexible, allowing for subsequent size adjustments based on technological advancements and material research results, adapting to various materials and processes, and enhancing the versatility and practicality of the sampling device.

[0041] like Figure 1 As shown, this is a specific implementation of the sampling device provided in this embodiment, wherein the sample inlet chamber 4 and the sample storage chamber 5 are coaxially arranged.

[0042] Specifically, during material transfer, the coaxial layout ensures that the material flows in a straight line from the inlet chamber 4 to the storage chamber 5, greatly reducing resistance and energy loss caused by turning or deflection. The material can enter the storage chamber 5 more efficiently, effectively avoiding jamming or accumulation, and strongly guaranteeing the continuity and stability of the sampling process. Secondly, from an installation and positioning perspective, the coaxial configuration greatly facilitates the installation of the entire sampling device. It allows for more precise docking when connecting the sampling device to the air jet mill body and other related components, reducing problems such as material leakage or inaccurate sampling that may result from installation errors.

[0043] like Figure 1As shown, this is a specific implementation of the sampling device provided in this embodiment, wherein the sample inlet chamber 4 and the sample storage chamber 5 are connected by a throttling channel 6.

[0044] Specifically, the throttling channel 6 precisely controls the flow rate of material from the sample inlet chamber 4 to the sample storage chamber 5. When the material enters the sample inlet chamber 4, it is restricted by the throttling channel 6 and will not rush into the sample storage chamber 5 at an excessively high speed, thus avoiding a strong impact on the sample storage chamber 5 due to excessive flow velocity. This effectively prevents unstable conditions such as splashing and rebounding of the material in the sample storage chamber 5, ensuring that the material can be stably deposited and temporarily stored in the sample storage chamber 5.

[0045] It should be noted that this embodiment does not limit the number and orifice of the throttling channels 6, because as long as they can guide and limit the flow of materials, the number and orifice of the throttling channels 6 can be adjusted according to the state of the material to be sampled.

[0046] like Figure 1 As shown, this is a specific implementation of the sampling device provided in this embodiment. The sample inlet chamber 4 and the sample storage chamber 5 have a structure that gradually narrows towards the throttling channel 6, at least in the portion near the throttling channel 6.

[0047] Specifically, during material transfer, this constriction structure effectively guides the material to flow more concentratedly into the throttling channel 6, making the process of material entering the throttling channel 6 more precise and smooth. The pressure formed at the constriction facilitates the smooth passage of material through the throttling channel 6 into the sample storage chamber 5, reducing the risk of material accumulation or stagnation at the channel entrance. On one side of the sample storage chamber 5, after passing through the throttling channel 6, the constriction structure better receives and disperses the material, allowing it to be more evenly distributed within the sample storage chamber 5, which is beneficial for subsequent analysis and testing. The constriction design also provides a certain buffering effect, reducing interference with the material state within the sample storage chamber 5 when there is material impact or airflow fluctuation, maintaining the stability of the material during sampling, further optimizing the overall performance of the sampling device, and ensuring high-quality sampling.

[0048] like Figure 1 As shown, this is a specific implementation of the sampling device provided in this embodiment, wherein the purge port 3 is connected to the sample storage chamber 5.

[0049] Specifically, since the sample storage chamber 5 is the main temporary storage area for materials during the sampling process, the problem of material residue is relatively prominent. After sampling is completed, compressed air enters through the purge port 3, which is directly connected to the sample storage chamber 5. This direct connection method avoids energy dispersion and path detours of the purge air during transmission, enabling the purge air to act on every corner and wall of the sample storage chamber 5 with a strong and concentrated airflow force.

[0050] like Figure 1As shown, this is a specific implementation of the sampling device provided in this embodiment, wherein the purge port 3 is perpendicular to the central axis of the sampling chamber.

[0051] Specifically, when the purge air enters the sampling chamber from a direction perpendicular to the central axis, it creates a unique airflow distribution pattern within the chamber. Compared to purge ports 3 at other angles, the vertically entering purge air provides a more comprehensive and uniform coverage of the sampling chamber. It simultaneously targets the side walls, bottom, and corners of the sampling chamber—areas prone to material residue—effectively removing material residue without leaving any blind spots. Moreover, the vertical purge airflow has a stronger impact force. During the cleaning process, this powerful impact force more efficiently peels away stubborn material adhering to the chamber walls, ensuring a higher standard of cleanliness for the sampling chamber.

[0052] like Figure 1 As shown, this is a specific implementation of the sampling device provided in this embodiment. The sampling component has a rear cover 7 detachably connected to the sample outlet 2.

[0053] Specifically, the rear cover 7 is threadedly connected to the sampling device and engages with the sample outlet 2 of the sampling component. During sampling, the rear cover 7 is tightly connected, sealing the sample outlet 2 to effectively prevent material leakage if the expected result is not achieved, ensuring the sealing and stability of the sampling process. When it is necessary to remove the material from the sample storage chamber 5 for subsequent analysis and testing, the detachable feature allows the rear cover 7 to be easily opened or removed. Operators can easily obtain material samples, making the operation smooth and efficient. Furthermore, a sealing gasket is provided on the inner end face of the rear cover 7 to ensure that the sample outlet 2 and the rear cover 7 maintain a reliable seal at all times during the sampling process.

[0054] Alternatively, in other embodiments, the connection between the rear cover 7 and the sampling element can be replaced by a magnetic connection, with magnets of opposite magnetic properties installed on the edges of the sample outlet 2 and the rear cover 7, respectively. When the rear cover 7 approaches the sample outlet 2, it automatically adheres to the sample outlet 2 under the influence of magnetic force, achieving a sealed connection. This connection method offers the advantages of ease of operation and a good sealing effect.

[0055] like Figure 2 As shown, this is a specific implementation of the air jet mill provided in this embodiment, including: an air jet mill body and a sampling device as described in any of the above solutions, wherein the air jet mill body has a sampling port, a valve is connected to the sampling port, and the sampling device is connected to the outlet of the valve.

[0056] Specifically, the sampling port of the air jet mill is a critical path for material discharge, and the valve connected to it can precisely and flexibly control sampling. During normal operation, the valve is closed to maintain a stable and independent internal process environment, ensuring continuous and efficient material grinding. When sampling is required, the valve is opened, and the material flows into the connected sampling device through the sampling port under the action of airflow or gravity.

[0057] It should be noted that in this embodiment, the air classifier mill mainly consists of two key parts: the air classifier mill main unit 9 and the classifier. First, gas enters through the compressed air inlet 12 and then flows through the annular airflow distribution chamber 10, where it is rationally distributed to the various high-pressure pipes 11. The compressed air is further pressurized after passing through this structure and then smoothly enters the main unit cavity, thereby creating a suitable material crushing environment. At this time, the motor 16 of the air classifier mill is turned on, and the airflow is drawn out from the discharge port 15, creating a negative pressure environment inside the main unit cavity of the air classifier mill. This negative pressure greatly facilitates the smooth discharge of qualified materials. Once the negative pressure environment inside the main unit cavity stabilizes, the feed port 8 is opened, and the material can enter the equipment in an orderly manner. Throughout the entire operation of the equipment, the airflow pressure environment inside the main unit cavity must remain constant; therefore, a dynamic sampling device is needed to perform sampling under constant pressure. In addition, the air jet mill is also equipped with a main cleaning port 13. After the entire production process is completed, the main cleaning port 13 can be used to thoroughly clean the main cavity, thereby ensuring the purity and high quality of the materials produced in each process.

[0058] like Figure 2 , Figure 3 As shown, this is a specific implementation of the air jet mill provided in this embodiment. The observation port 17 on the vertical side wall of the air jet mill body serves as a sampling port, and the valve is a gate valve 18.

[0059] Specifically, the observation port 17 on the side wall of the classifier cavity 14 is used as the sampling port, utilizing the existing structure to eliminate additional drilling costs and complex modifications. A gate valve 18 is used, which is simple in structure, easy to operate, and has good sealing performance. When open, it provides a smooth path for material to flow from the observation port 17 (sampling port) to the sampling device; when closed, it immediately cuts off the material flow, ensuring that the internal environment of the air jet mill quickly returns to stability. While ensuring normal operation, it improves the convenience, efficiency, and reliability of sampling, helping the air jet mill to balance production monitoring and accurate sampling when processing high-viscosity materials, thus optimizing the overall system performance.

[0060] In addition, in other embodiments, the valve can also select a ball valve, and the opening and closing of the valve are realized by rotation of the ball. The ball has a circular through hole, and when the through hole is consistent with the direction of the pipeline, the valve is opened, and the material can pass smoothly; when the ball is rotated by 90 degrees, the through hole is perpendicular to the pipeline, the valve is closed, and the material flow is cut off. The ball valve has good sealing performance, and has good flow regulation characteristics, and in a partially open state, the flow of the material can also be accurately controlled.

[0061] Working principle:

[0062] During the operation of the jet mill body, when sampling is required, the gate valve 18 connected at the sampling port (such as the multipurpose sampling port of the vertical side wall viewing port 17) of the jet mill body is opened, and the material is introduced into the sampling device under the action of the gas flow or its own gravity through the sampling cavity 4. The sampling cavity 4 is coaxially arranged with the sample storage cavity 5 and is communicated through the throttling channel 6, and the constricted structure near the throttling channel 6 guides the material to pass through the throttling channel 6 smoothly into the sample storage cavity 5. After sampling is completed, the gate valve 18 is closed to prevent material leakage and impurities from entering. If the material needs to be taken out, the detachable rear cover 7 at the sample outlet 2 of the sample storage cavity 5 is opened to obtain the sample. Then, the purge port 3 is connected to the purge gas to clean the sample storage cavity 5, and because the purge port 3 is communicated with the sample storage cavity 5 and is perpendicular to the central axis of the sampling cavity, the material residue can be efficiently removed, ensuring that the sampling device is ready for the next sampling. The whole process realizes accurate sampling, safe temporary storage, convenient removal and effective cleaning of the material, and guarantees stable operation and efficient monitoring of the jet mill system.

[0063] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and variations fall within the scope of the present application.

Claims

1. A sampling device, characterized in that, The sampling device comprises a sampling member, the inside of which has a sampling cavity for containing material, the sampling cavity having a sampling inlet (1) and an openable sampling outlet (2), the sampling inlet (1) being adapted to communicate with the sampling port; The sampling member is further provided with a purge port (3) which communicates with the sampling cavity, the purge port (3) being adapted to communicate with purge gas.

2. The sampling device of claim 1, wherein, The sampling cavity comprises a sampling inlet cavity (4) and a sampling storage cavity (5) which communicate in sequence, the sampling inlet cavity (4) having a sampling inlet (1), and the sampling storage cavity (5) having a sampling outlet (2).

3. The sampling device of claim 2, wherein, The sampling inlet cavity (4) and the sampling storage cavity (5) are coaxially arranged.

4. The sampling device of claim 3, wherein, The sampling inlet cavity (4) and the sampling storage cavity (5) communicate through a throttling channel (6).

5. The sampling device of claim 4, wherein, At least the part of the sampling inlet cavity (4) and the sampling storage cavity (5) close to the throttling channel (6) is gradually tapered towards the throttling channel (6).

6. The sampling device of any one of claims 2-5, wherein, The purge port (3) communicates with the sampling storage cavity (5).

7. The sampling device of any one of claims 1-5, wherein, The purge port (3) is perpendicular to the central axis of the sampling cavity.

8. The sampling device of any one of claims 1-5, wherein, A rear cover (7) is detachably connected to the sampling member at the sampling outlet (2).

9. An air jet mill characterized in that, The sampling device comprises: The gas flow mill body and the sampling device of any one of claims 1-8, the gas flow mill body having a sampling port, the sampling port being connected with a valve, and the sampling device being connected to the outlet of the valve.

10. The jet mill of claim 9, wherein, The viewing port (17) on the vertical side wall of the gas flow mill body serves as the sampling port, and the valve is a gate valve (18).

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