Airflow mill

Abstract

The invention provides an airflow mill. The airflow mill comprises a shell, a grading wheel, a discharging piece, a material guiding disc assembly and a nozzle. A cavity is defined by the shell, the grading wheel and the material guiding disc assembly are arranged in the cavity, a feeding opening is formed in the shell and communicates with the interior and the exterior of the cavity, and the feeding opening is used for guiding materials into the cavity; the grading wheel, the discharging piece, the material guide disc assembly and the nozzle are sequentially arranged from high to low in the height direction, and the feeding port is not lower than the grading wheel in the height direction, so that materials enter the discharging piece to be discharged after being graded and enter the position below the discharging piece to be smashed; the nozzles are used for spraying main airflow towards the upper portion, so that materials are driven by the main airflow to impact the material guide disc assembly to be smashed and guided by the material guide disc assembly to the grading wheel to be graded again. According to the jet mill provided by the invention, materials entering the jet mill can firstly enter the grading wheel to be graded, so that qualified materials after grading can directly enter the discharging device from the grading wheel to be discharged and cannot be crushed again, and the yield of qualified particles is improved.

Description

Technical Field

[0001] The invention relates to the field of powder processing, in particular to a jet mill. Background Art

[0002] Jet mills are widely used in the field of powder processing. Their working principle is that after filtered and dried, compressed air is sprayed into the grinding chamber at high speed through a Laval nozzle. At the intersection of multiple high-pressure airflows, the material is repeatedly collided, rubbed, sheared and crushed. The crushed material moves to the classification area with the rising airflow under the suction force of the fan. Under the strong centrifugal force generated by the high-speed rotating classification turbine, the coarse and fine materials are separated. The fine particles that meet the particle size requirements enter the cyclone separator and dust collector for collection through the classification wheel, and the coarse particles fall to the grinding area for further grinding.

[0003] In the existing jet mill, excessive frequency of material collision during the crushing process will produce fine powder, which needs to be collected by a dust collector as a by-product. Too much fine powder will seriously affect the output rate of qualified particles.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The present invention provides a jet mill to solve the technical problem in the prior art that the jet mill is prone to produce too much fine powder and affect the output rate due to excessive frequency of material collision.

[0006] The present invention provides an air flow mill, comprising a shell, a classifying wheel, a material discharging piece, a material guide plate assembly and a nozzle; the shell is surrounded by a cavity, the classifying wheel and the material guide plate assembly are arranged in the cavity, a feed port is opened on the shell to communicate with the inside and outside of the cavity, and the feed port is used to introduce materials into the cavity; the classifying wheel, the material discharging piece, the material guide plate assembly and the nozzle are arranged in sequence from high to low in the height direction, and the feed port is not lower than the classifying wheel in the height direction, so that the materials can enter the material discharging piece for discharging and be crushed under the material discharging piece respectively after being classified; the nozzle is used to spray a main airflow toward the top, so that the materials are driven by the main airflow to hit the material guide plate assembly and then crushed and guided by the material guide plate assembly to the classifying wheel for re-classification.

[0007] In a further embodiment of the present invention, a discharge channel is formed inside the discharge member, and the inlet of the discharge channel is directly below the qualified outlet of the grading wheel; the feed port and at least part of the inlet of the grading wheel are on the same horizontal plane.

[0008] In a further embodiment of the present invention, the shell and the nozzle are arranged to form an annular groove body, and the annular groove body and the nozzle are arranged concentrically; the air flow mill also includes an air inlet pipe, which is connected to the annular groove body to form an auxiliary air flow from the annular groove body to allow the material to enter the main air flow.

[0009] In a further embodiment of the present invention, the material guide plate assembly includes: a plate seat, which is arranged on the discharge piece; and a target material, which is located directly above the nozzle so that the material driven by the main airflow is crushed when it hits the target material; the target material is conical and is located directly below the inlet of the discharge channel and the grading wheel, so that the crushed material can be guided to the grading wheel for re-grading.

[0010] In a further embodiment of the present invention, the material guide plate assembly also includes: a first connecting member, connecting the plate seat and the discharge member; a second connecting member, connecting the target material and the discharge member and clamping the plate seat between the target material and the discharge member; a through hole is provided on the plate seat, and the second connecting member passes through the plate seat from the through hole.

[0011] In a further embodiment of the present invention, the material guide plate assembly also includes a pressure sensor, which is connected to the second connecting member; an installation groove is opened on the target material, and the pressure sensor is arranged in the installation groove. The pressure sensor is located directly below the nozzle hole of the nozzle to obtain the wear state of the target material according to the pressure.

[0012] In a further embodiment of the present invention, the second connecting member is further provided with an installation channel, which penetrates the second connecting member along the axial direction of the second connecting member; the pressure sensor is inserted into the installation channel to connect to the second connecting member, and the power cord of the pressure sensor passes through the second connecting member from the installation channel.

[0013] In a further embodiment of the present invention, the air flow mill further comprises a driving member, which is arranged on the shell and outside the cavity, and a power output shaft of the driving member passes through the shell and is transmission-connected to the classifying wheel to drive the classifying wheel for classification.

[0014] In a further embodiment of the present invention, the air flow mill also includes a feed pipe, a feed valve and a blower. The feed valve is arranged on the feed pipe. The feed pipe is connected to the cavity from the feed port. The air outlet of the blower is connected to the feed pipe to drive the material into the cavity from the feed valve.

[0015] In a further embodiment of the present invention, the shell includes: a first shell, on which a feed port, a grading wheel and a discharge piece are arranged; a second shell, including a first mounting section, a second mounting section and a connecting section, the connecting section connects the first mounting section and the second mounting section, the first mounting section is connected to the first shell, the air inlet pipe and the nozzle are arranged on the second mounting section, and the width of the connecting section gradually increases from one side of the second mounting section toward one side of the first mounting section.

[0016] The air flow mill provided by the present invention arranges the classifying wheel, the discharging piece, the guide plate assembly and the nozzle in sequence from high to low in the height direction, and the feed port is not lower than the classifying wheel in the height direction, so that the material entering the feed port will first enter the classifying wheel for classification, and thus the qualified material after classification will directly enter the discharging piece from the classifying wheel and be discharged without being crushed again, thereby reducing the output of fine powder and effectively improving the output rate of qualified particles. Unqualified particles enter the bottom of the cavity from the classifying wheel, are driven by the nozzle to be ejected upward and impact on the guide plate assembly for crushing.

[0017] Other features and advantages of the embodiments of the present invention will be described in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the structure of a jet mill provided in one embodiment of the present invention; Figure 2 A schematic diagram of a partial structure of a jet mill provided in one embodiment of the present invention; Figure 3 A schematic diagram of the structure of a discharging member and a pouring assembly provided in one embodiment of the present invention; Figure 4 for Figure 1 Sectional view at AA in the middle; Figure 5 An airflow diagram of a jet mill according to one embodiment of the present invention.

[0020] Reference numerals 100, housing; 110, second housing; 111, first mounting section; 112, second mounting section; 113, connecting section; 120, first housing; 100A, cavity; 100B, annular groove; 200, material guide plate assembly; 210, plate seat; 220, target material; 230, first connecting member; 240, second connecting member; 250, pressure sensor; 310, nozzle; 320, air intake pipe; 400, discharging member; 400A, discharging channel; 500, grading wheel; 600, driving member; 700, feed pipe; 800, blower; 900, feed valve. DETAILED DESCRIPTION

[0021] In order to make the above and other features and advantages of the present invention more clear, the present invention is further described below in conjunction with the accompanying drawings. It should be understood that the specific embodiments given herein are for the purpose of explaining to those skilled in the art and are only exemplary and not restrictive.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0024] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0026] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0027] Please refer to Figure 1-Figure 2 The present invention provides a jet mill, comprising a shell 100, a classifying wheel 500, a material discharging member 400, a material guide disc assembly 200 and a nozzle 310; the shell 100 is arranged to form a cavity 100A, the classifying wheel 500 and the material guide disc assembly 200 are arranged in the cavity 100A, and a feed port (not marked in the figure) is opened on the shell 100 to communicate with the inside and outside of the cavity 100A, and the feed port is used to introduce materials into the cavity 100A; the classifying wheel 500, the material discharging member 400, the material guide disc assembly 200 and the nozzle 310 are arranged in sequence from high to low in the height direction, and the feed port is not lower than the classifying wheel 500 in the height direction, so that the materials enter the material discharging member 400 for discharging and are crushed below the material discharging member 400 respectively after being classified; the nozzle 310 is used to spray the main airflow toward the top, so that the materials are driven by the main airflow to hit the material guide disc assembly 200 and then crushed and guided by the material guide disc assembly 200 to the classifying wheel 500 for re-classification.

[0028] It can be understood that the grading wheel 500 provided in the present application is a commonly used material sorting equipment in the prior art, which realizes particle sorting through the synergistic effect of centrifugal force and fluid dynamics. It usually includes an inlet and two outlets, one of which is a qualified outlet for qualified particles. The present invention will not elaborate on its specific structure in detail.

[0029] For height direction, please refer to Figure 2 ,exist Figure 2 The direction indicated by X is the height direction.

[0030] Furthermore, the discharge piece 400 needs to realize the discharge function of the entire air flow mill, that is, to introduce qualified materials from the cavity 100A into the outside of the shell 100. Since the grading wheel 500 has already graded the materials, it is only necessary to set the inlet of the discharge piece 400 below the qualified outlet of the grading wheel 500 to discharge the qualified materials.

[0031] It should be noted that the nozzle 310, as an airflow forming component, is only suitable for forming concentrated airflow. Therefore, an external air source such as an air pump and an air tank (not shown in the figure) is required. At the same time, the air supply pressure must be controlled to ensure the impact speed of the material when it is driven by the airflow, thereby ensuring the impact force.

[0032] In summary, the air flow mill provided by the present invention arranges the classifying wheel 500, the discharging piece 400, the guide plate assembly 200 and the nozzle 310 in sequence from high to low in the height direction, and the feed port is not lower than the classifying wheel 500 in the height direction, so that the material entering the feed port will first enter the classifying wheel 500 for classification, and thus the qualified material after classification will directly enter the discharging piece from the classifying wheel 500 and be discharged, and will not be crushed again, thereby reducing the output of fine powder and effectively improving the output rate of qualified particles. Unqualified particles enter the bottom of the cavity 100A from the classifying wheel 500, and are driven by the nozzle 310 to be ejected upward and impact on the guide plate assembly 200 for crushing.

[0033] In a further embodiment, a discharge channel 400A is formed inside the discharge member 400, and the inlet of the discharge channel 400A is directly below the qualified outlet of the grading wheel 500; the feed port and at least part of the inlet of the grading wheel 500 are on the same horizontal plane.

[0034] In this solution, the inlet of the discharge channel 400A is located directly below the qualified outlet of the grading wheel 500, which can ensure that most of the qualified materials can enter the discharge channel 400A for discharge, and the feed port and at least part of the inlet of the grading wheel 500 are on the same horizontal plane, which can ensure that most of the materials entering the cavity 100A can first enter the grading wheel 500 for grading and screening, rather than being crushed, thereby effectively reducing the output of fine powder.

[0035] Please refer to Figure 4 In a further embodiment, the shell 100 and the nozzle 310 are arranged to form an annular groove body 100B, and the annular groove body 100B and the nozzle 310 are arranged concentrically; the air flow mill also includes an air inlet pipe 320, and the air inlet pipe 320 is connected to the annular groove body 100B to form an auxiliary air flow from the annular groove body 100B to allow the material to enter the main air flow.

[0036] In this solution, the annular groove body 100B surrounds the nozzle 310, so an auxiliary airflow is formed around the main airflow. The auxiliary airflow can drive the materials that are not in the main airflow to move into the main airflow, thereby ensuring that all materials are effectively crushed. For the driving effect of the auxiliary airflow, please refer to Figure 5 ,exist Figure 5 The arrows in the figure indicate the direction of gas flow.

[0037] Furthermore, there are multiple air inlet pipes 320, and the multiple air inlet pipes 320 are arranged around the circumference of the nozzle 310 to ensure that the auxiliary air flow ejected from the annular groove body 100B is uniform. On the other hand, it is also necessary to ensure that the speed of the auxiliary air flow is lower than the main air flow. This can be achieved by setting the air pressure of the two, that is, controlling the air pressure of the main air flow to be greater than the air pressure of the auxiliary air flow. In conventional products, the air pressure of the main air flow is between one kilogram and eight kilograms, while the air pressure of the auxiliary air flow is less than one kilogram.

[0038] Please attend Figure 3 In a further embodiment, the guide plate assembly 200 includes: a plate seat 210, which is arranged on the discharge member 400; and a target material 220, which is located directly above the nozzle 310, so that the material driven by the main airflow is crushed when it hits the target material 220; the target material 220 is conical and is located directly below the inlet of the discharge channel 400A and the grading wheel 500, so that the crushed material is guided to the grading wheel 500 for re-grading.

[0039] In this solution, the main airflow formed by the nozzle 310 will drive the material to collide with the target 220, thereby crushing the material. Since the target 220 is conical, the material that hits the target 220 will move along the conical surface of the target 220 until it moves to the periphery of the grading wheel 500 and is absorbed by the grading wheel 500 for re-grading. Furthermore, at least a portion of the disc base 210 can be set to a truncated cone shape to cooperate with the guidance of the target 220.

[0040] The design of the material guide plate assembly 200 ensures that most of the material will enter the grading wheel 500 each time it is driven by the airflow to hit the target material 220, that is, the material will be graded each time it is crushed. Qualified material will be directly discharged from the discharge piece 400, and material with too large particle size will be crushed again. This can reduce the amount of particle crushing and the output of fine powder, thereby increasing the output rate of qualified material.

[0041] In a further embodiment, the guide plate assembly 200 also includes: a first connecting member 230, connecting the plate base 210 and the discharge member 400; a second connecting member 240, connecting the target material 220 and the discharge member 400 and clamping the plate base 210 between the target material 220 and the discharge member 400; a through hole is provided on the plate base 210, and the second connecting member 240 passes through the plate base 210 from the through hole.

[0042] In a further embodiment, the material guide plate assembly 200 also includes a pressure sensor 250, which is connected to the second connecting member 240; an installation groove (not marked in the figure) is opened on the target material 220, and the pressure sensor 250 is arranged in the installation groove. The pressure sensor 250 is located directly below the nozzle hole of the nozzle 310 to obtain the wear state of the target material 220 according to the pressure.

[0043] It should be noted that the wear state of the target material 220 is obtained based on the pressure state. Specifically, the pressure sensor 250 is set in the installation groove and is not subjected to pressure. The nozzle 310 will wear the target material 220 by ejecting a high-pressure main airflow to impact the target material 220. Since the target material 220 is conical and the pressure sensor 250 is located directly below the nozzle hole of the nozzle 310, when the target material 220 is worn to a certain extent (such as being penetrated), the material will directly hit the pressure sensor 250. Therefore, the pressure sensor 250 detects the pressure value and determines that the target material 220 has been worn and needs to be replaced.

[0044] In a further embodiment, the second connecting member 240 is also provided with an installation channel (not marked in the figure), and the installation channel penetrates the second connecting member 240 along the axial direction of the second connecting member 240; the pressure sensor 250 is inserted into the installation channel to connect to the second connecting member 240, and the power cord of the pressure sensor 250 passes through the second connecting member 240 from the installation channel.

[0045] Furthermore, in order to facilitate the installation of the power cord of the pressure sensor 250, a channel can be designed on the shell 100 and the discharge piece 400 for the power cord to pass through, or the power supply line can be pre-buried when the discharge piece 400 and the shell 100 are formed, and it only needs to be electrically connected to the power cord of the pressure sensor 250.

[0046] Furthermore, both ends of the outer wall of the second connecting member 240 are provided with external threads, through which the discharge member 400 and the target material 220 are respectively connected, and the installation channel is provided with internal threads, through which the pressure sensor 250 is connected.

[0047] In a further embodiment, the air flow mill further includes a driving member 600, which is disposed on the housing 100 and outside the cavity 100A. The power output shaft of the driving member 600 passes through the housing 100 and is transmission-connected to the classifying wheel 500 to drive the classifying wheel 500 to classify.

[0048] In a further embodiment, the air flow mill also includes a feed pipe 700, a feed valve 900 and a blower 800. The feed valve 900 is arranged on the feed pipe 700. The feed pipe 700 is connected to the cavity 100A from the feed port. The air outlet of the blower 800 is connected to the feed pipe 700 to drive the material from the feed valve 900 into the cavity 100A.

[0049] In this solution, the blower 800 forms an airflow, which can drive the material entering the feed pipe 700 from the feed valve 900 into the cavity 100A. Driven by the airflow, the material entering the cavity 100A will have an initial velocity, thereby ensuring that most of the material can enter the grading wheel 500 for grading.

[0050] In a further embodiment, the shell 100 includes: a first shell 120, on which a feed port, a grading wheel 500 and a discharge piece 400 are arranged; a second shell 110, including a first mounting section 111, a second mounting section 112 and a connecting section 113, the connecting section 113 connects the first mounting section 111 and the second mounting section 112, the first mounting section 111 is connected to the first shell 120, the air inlet pipe 320 and the nozzle 310 are arranged on the second mounting section 112, and the width of the connecting section 113 gradually increases from one side of the second mounting section 112 toward one side of the first mounting section 111.

[0051] In a further embodiment, since the width of the connecting section 113 gradually increases from the second mounting section 112 side toward the first mounting section 111 side, the unqualified materials discharged from the grading wheel 500 will slide down along the connecting section 113 when falling, until they slide to the vicinity of the annular groove body 100B. At this time, the unqualified materials will be driven by the auxiliary airflow to rise into the main airflow.

[0052] In a further embodiment, the nozzle 310, the discharge piece 400 and the feed pipe 700 are connected to the housing 100 via flanges, while the air inlet pipe 320 is integrally formed with the housing 100, and the inlet of the discharge piece 400 is gap-matched with the qualified outlet of the grading wheel 500.

[0053] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A jet mill, characterized in that: It comprises a housing (100), a grading wheel (500), a material discharging member (400), a material guide plate assembly (200), and a nozzle (310); The shell (100) is arranged to form a cavity (100A), the classification wheel (500) and the guide plate assembly (200) are arranged in the cavity (100A), and a feed port is provided on the shell (100) to communicate with the inside and outside of the cavity (100A), and the feed port is used to introduce materials into the cavity (100A); The classifying wheel (500), the discharge piece (400), the guide plate assembly (200), and the nozzle (310) are arranged in descending order in the height direction, and the feed port is not lower than the classifying wheel (500) in the height direction, so that the materials, after being classified, enter the discharge piece (400) for discharge and are crushed under the discharge piece (400); The nozzle (310) is used to spray a main airflow directly upward, so that the material is driven by the main airflow to collide with the material guide disc assembly (200) and then is crushed and guided by the material guide disc assembly (200) to the classification wheel (500) for re-classification.

2. The jet mill according to claim 1, characterized in that: A discharge channel (400A) is formed inside the discharge member (400), and an inlet of the discharge channel (400A) is located directly below a qualified outlet of the classification wheel (500); The feed inlet and at least a portion of the inlet of the classifying wheel (500) are located on the same horizontal plane.

3. The jet mill according to claim 1, characterized in that: The housing (100) and the nozzle (310) are arranged to form an annular groove body (100B), and the annular groove body (100B) and the nozzle (310) are arranged cocentrically; The jet mill further comprises an air inlet pipe (320), wherein the air inlet pipe (320) is connected to the annular trough body (100B) so as to form an auxiliary airflow from the annular trough body (100B) so that the material enters the main airflow.

4. The jet mill according to claim 2, characterized in that: The material guide tray assembly (200) comprises: A disc seat (210) is disposed on the material discharging member (400); and A target material (220) is located directly above the nozzle (310), so that the material driven by the main airflow is crushed when it hits the target material (220); The target material (220) is conical and is located directly below the inlet of the discharge channel (400A) and the classification wheel (500), so that the crushed material is guided to the classification wheel (500) for re-classification.

5. The jet mill according to claim 4, characterized in that: The material guide tray assembly (200) further comprises: A first connecting member (230) connecting the disc seat (210) and the material discharging member (400); a second connecting member (240) connecting the target material (220) and the material discharging member (400) and clamping the disc seat (210) between the target material (220) and the material discharging member (400); The disc seat (210) is provided with a through hole, and the second connecting member (240) passes through the disc seat (210) through the through hole.

6. The jet mill according to claim 5, characterized in that: The material guide plate assembly (200) further comprises a pressure sensor (250), wherein the pressure sensor (250) is connected to the second connecting member (240); The target material (220) is provided with a mounting groove, the pressure sensor (250) is arranged in the mounting groove, and the pressure sensor (250) is located directly below the spray hole of the nozzle (310) to obtain the wear state of the target material (220) according to the pressure.

7. The jet mill according to claim 6, characterized in that: The second connecting member (240) is further provided with a mounting channel, wherein the mounting channel penetrates the second connecting member (240) along the axial direction of the second connecting member (240); The pressure sensor (250) is inserted into the installation channel to connect to the second connection piece (240), and a power line of the pressure sensor (250) passes through the second connection piece (240) from the installation channel.

8. The jet mill according to claim 1, characterized in that: The air flow mill further comprises a driving member (600), wherein the driving member (600) is arranged on the housing (100) and is located outside the cavity (100A), and a power output shaft of the driving member (600) passes through the housing (100) and is transmission-connected to the classifying wheel (500) so as to drive the classifying wheel (500) to perform classification.

9. The jet mill according to claim 1, characterized in that: The air flow mill further comprises a feed pipe (700), a feed valve (900) and a blower (800); the feed valve (900) is arranged on the feed pipe (700); the feed pipe (700) is connected to the cavity (100A) from the feed port; the air outlet of the blower (800) is connected to the feed pipe (700) to drive the material from the feed valve (900) into the cavity (100A).

10. The jet mill according to claim 3, characterized in that: The housing (100) comprises: A first shell (120), wherein the feed port, the grading wheel (500) and the discharge member (400) are arranged on the first shell (120); The second housing (110) comprises a first mounting section (111), a second mounting section (112) and a connecting section (113); the connecting section (113) connects the first mounting section (111) and the second mounting section (112); the first mounting section (111) is connected to the first housing (120); the air intake pipe (320) and the nozzle (310) are arranged on the second mounting section (112); and the width of the connecting section (113) gradually increases from a side of the second mounting section (112) toward a side of the first mounting section (111).

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