Jet mill

Abstract

The utility model relates to the technical field of powder conveying, and discloses an airflow mill. The airflow mill comprises a shell, an air pipe, an exhaust assembly and a screening assembly. A cavity is formed in the shell; a feeding hole and a discharging hole are formed in the shell, and both the feeding hole and the discharging hole are communicated with the cavity; the exhaust assembly is arranged at the end, close to the discharging opening, of the shell. The screening assembly comprises a screen and a magnet exciting coil. The screen is installed in the cavity and is blocked between the feeding port and the discharging port, the magnet exciting coil is arranged on the outer side of the shell in a surrounding mode, the magnet exciting coil corresponds to the screen in position, and the magnet exciting coil is used for being powered on to generate a magnetic field so that the screen can have magnetism. The screen is arranged between the feeding port and the discharging port in the cavity for blocking, the magnet exciting coil surrounds the position, corresponding to the screen, of the outer side of the shell, the screen has magnetism through the magnet exciting coil, then magnetic particles are adsorbed in the material screening process, demagnetizing operation is conducted on smashed materials, and the magnetic heterogeneity of the smashed materials is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of powder conveying, in particular to an air flow mill. Background Art

[0002] Airflow mill is also called airflow pulverizer. Due to its pulverizing mechanism, airflow mill has a wide range of applications and high finished product fineness. If the ordinary air in the air source is changed to inert gas, it can also be used for pulverizing flammable, explosive or oxidizable materials.

[0003] During operation, the compressed gas is filtered and dried, and then sprayed into the chamber at high speed through a high-pressure nozzle. At the intersection of multiple high-pressure airflows, the materials are repeatedly collided, rubbed and sheared to crush the materials. The crushed materials are classified with the rising airflow generated by the rotation of the impeller. Those that meet the particle size requirements will be discharged from the airflow mill with the airflow and collected uniformly, and the coarse particles will drop to the intersection of the airflows and continue to be crushed.

[0004] Magnetic materials may be mixed in the existing materials, which will cause magnetic particles to appear during the airflow crushing process. If they cannot be effectively removed, the powder will have a high magnetic anomaly after crushing. The powder with high magnetic anomaly will be subjected to demagnetization adsorption operation. Since the particle size is small and cannot be dispersed, it is difficult to completely remove the magnetic particles in the powder, which will lead to poor demagnetization effect and high magnetic anomaly of the powder. Utility Model Content

[0005] The technical problems to be solved by the utility model are:

[0006] Existing jet mills cannot effectively remove magnetic particles.

[0007] In order to solve the above technical problems, the utility model provides a jet mill, comprising:

[0008] A housing, wherein a chamber is disposed in the housing; a feed port and a discharge port are disposed on the housing, and both the feed port and the discharge port are communicated with the chamber;

[0009] An air pipe connected to the shell and communicating with the chamber, and used for blowing high-pressure gas into the chamber to crush the material fed from the feed port;

[0010] an exhaust assembly, the exhaust assembly being disposed at one end of the housing close to the discharge port, the exhaust assembly being used to discharge the gas in the chamber from the discharge port; and

[0011] A screening component, the screening component includes a screen and an excitation coil; the screen is installed in the chamber, the screen blocks the feed port and the discharge port, the excitation coil is arranged around the outside of the shell, the excitation coil corresponds to the position of the screen, and the excitation coil is used to generate a magnetic field by energizing to make the screen magnetic.

[0012] In one of the embodiments, the periphery of the screen is connected and fixed to the inner wall of the shell.

[0013] In one embodiment, the screen is a cast iron part.

[0014] In one of the embodiments, a waste port is provided at one end of the shell away from the discharge port; the air flow mill also includes a blind plate assembly, the blind plate assembly includes a cover plate and a magnetic block, the cover plate covers the waste port, and the magnetic block is connected to the cover plate.

[0015] In one embodiment, the communication position between the air pipe and the chamber is located between the screen and the magnetic block.

[0016] In one embodiment, the magnetic block extends from the cover plate into the chamber.

[0017] In one of the embodiments, the magnetic block is detachably connected to the cover plate, and the blind plate assembly further comprises a fixing bolt; the fixing bolt passes through the cover plate from a side of the cover plate away from the magnetic block, and is threadedly connected to the magnetic block.

[0018] In one of the embodiments, the blind plate assembly further includes a protective cover; the protective cover is arranged on the outside of the magnetic block, and the protective cover is a colloid part or a zirconium oxide part.

[0019] In one embodiment, the exhaust assembly includes a driving member and an impeller; the driving member is connected to the housing, the impeller is disposed in the chamber, and the driving member is used to drive the impeller to rotate.

[0020] In one embodiment, there are multiple air pipes, each of which is arranged around the shell at intervals, and the connecting position between the air pipe and the chamber is located on the side of the feed port away from the discharge port.

[0021] Compared with the prior art, the above-mentioned jet mill has the following beneficial effects:

[0022] A screen is set between the feed port and the discharge port in the chamber for isolation, and an excitation coil is surrounded at the position corresponding to the screen on the outside of the shell. The screen is made magnetic through the excitation coil, and then the magnetic particles are adsorbed during the screening process to achieve demagnetization of the crushed material, thereby reducing the magnetic anomaly of the crushed material. Since the powder in the chamber is in a fully dispersed state due to the high-speed airflow, the screen adsorbs the magnetic particles in the dispersed powder, effectively improving the demagnetization effect of the powder. There is no need for a separate demagnetization adsorption operation later, thereby reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of a jet mill according to one embodiment of the utility model;

[0024] Figure 2 for Figure 1 Schematic diagram of the exploded structure of the center blind plate assembly.

[0025] The meanings of the numbers in the accompanying drawings are:

[0026] 100. Jet mill;

[0027] 10. Shell; 11. Feed port; 12. Discharge port; 15. Waste port;

[0028] 20. Trachea;

[0029] 30. Exhaust assembly; 31. Driving member; 32. Impeller;

[0030] 40. Screening assembly; 41. Screen; 42. Excitation coil;

[0031] 50. Blind plate assembly; 51. Cover plate; 52. Magnetic block; 53. Fixing bolt; 54. Protective cover;

[0032] 60. Quick release clamp. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth in conjunction with the accompanying drawings to describe the specific implementation methods of the utility model in detail. The following description is for a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0034] 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 a limitation on the present invention.

[0035] 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 utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] 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.

[0037] In the present utility model, 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.

[0038] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0039] See also Figure 1 and Figure 2 , is a jet mill 100 of an embodiment of the utility model, comprising a housing 10, an air pipe 20, an exhaust assembly 30 and a screening assembly 40. The housing 10 is provided with a chamber (not shown), which is used to provide a space required for material crushing operation; the housing 10 is provided with a feed port 11 and a discharge port 12, both of which are connected to the chamber, the feed port 11 is used to feed the material into the chamber, and the discharge port 12 is used to discharge the powdered material after the material is crushed from the chamber. The air pipe 20 is connected to the shell 10, and the air pipe 20 is connected to the chamber. The air pipe 20 is used to blow high-pressure gas into the chamber to crush the material fed from the feed port 11; it can be understood that the high-pressure gas here is not understood as a specific limitation on the gas pressure value. For different hardnesses of the crushed materials, the gas pressure value can be adjusted accordingly to ensure that the friction, collision and cutting between the material particles are driven by the airflow, and then the crushing requirements of the material can be achieved through the high-pressure gas, that is, the crushing of the material is achieved through the gas. The gas pressure during this operation can be understood as high pressure. The exhaust component 30 is arranged at one end of the shell 10 close to the discharge port 12. The exhaust component 30 is used to discharge the gas in the chamber from the discharge port 12, that is, the exhaust component 30 generates a lifting airflow in the chamber to carry out the crushed material. The screening assembly 40 includes a screen 41 and an excitation coil 42; the screen 41 is installed in the chamber, the screen 41 blocks the feed port 11 and the discharge port 12, the excitation coil 42 is arranged around the outside of the shell 10, the position of the excitation coil 42 corresponds to the screen 41, the excitation coil 42 is used to generate a magnetic field by energizing, so that the screen 41 has magnetism, and then the magnetic particles in the crushed powder are adsorbed, so as to realize the demagnetization operation synchronously during the material crushing process.

[0040] Furthermore, the housing 10 is provided in a hollow structure. Figure 1, the shell 10 and the chamber are arranged in the vertical direction, a discharge port 12 is arranged at the top of the shell 10, and a feed port 11 is arranged at the middle of the shell 10. In this embodiment, the shell 10 is also provided with a waste port 15. The waste port 15 is arranged at one end of the shell 10 away from the discharge port 12, that is, the waste port 15 is arranged at the bottom of the shell 10, and the material to be crushed enters the chamber from the middle of the shell 10. After crushing, the powder with qualified particle size moves to the top of the chamber and is discharged from the discharge port 12, and the material that cannot be crushed accumulates at the bottom of the chamber.

[0041] Furthermore, the air pipe 20 is connected to an external air supply device, and the air pipe 20 is used to pass the filtered dry high-speed gas into the chamber, thereby generating an airflow in the chamber to crush the material. In this embodiment, the number of the air pipes 20 is multiple, and each air pipe 20 is arranged at intervals around the shell 10. By setting multiple air pipes 20, a convergent airflow is generated in the chamber, and collision, friction and shearing between materials are achieved at the intersection of the airflows, thereby achieving the crushing operation of the material; the connection position of the air pipe 20 and the chamber is on the side of the feed port 11 away from the discharge port 12, that is, the convergence position of the airflow is located below the feed port 11. After the material to be crushed enters the chamber from the feed port 11, it falls to the intersection of the airflow under the action of its own gravity for crushing. After crushing, the qualified powder moves upward and is discharged through the discharge port 12, and the waste residue that cannot continue to be crushed is accumulated at the waste port 15 at the bottom.

[0042] Furthermore, the exhaust assembly 30 includes a driving member 31 and an impeller 32. The driving member 31 is connected to the housing 10, and the driving member 31 is arranged at the top of the housing 10. The impeller 32 is arranged in the chamber, and the driving member 31 is connected to the impeller 32. The driving member 31 is used to drive the impeller 32 to rotate. The rotation of the impeller 32 will generate a lifting airflow in the chamber, and the lifting airflow blows toward the discharge port 12. The crushed qualified powder is discharged from the discharge port 12 together with the lifting airflow. In this embodiment, the driving member 31 is a motor.

[0043] Furthermore, the screen 41 is in the shape of a straight plate, and the periphery of the screen 41 is connected and fixed to the inner wall of the shell 10. The screen 41 is provided with filter holes. The screen 41 filters the powder. The powder with qualified particle size can pass through the filter holes of the screen 41, and the material with unqualified particle size is blocked by the screen 41. The blocked material will be crushed again with the airflow to the convergence point of the airflow. Such a cycle ensures that the powder discharged through the discharge port 12 is filtered through the particle size, thereby ensuring the crushing effect of the material. The excitation coil 42 is arranged around the outside of the shell 10. The excitation coil 42 corresponds to the setting position of the screen 41. The excitation coil 42 is formed by repeatedly winding a wire, and then a magnetic field can be generated when the excitation coil 42 is energized. The screen 41 in the magnetic field has magnetism, so as to adsorb magnetic particles, and realize the synchronous operation of filtration and magnetic adsorption. The powder is in a fully dispersed state when passing through the screen 41. The fully dispersed state can ensure that the mixed magnetic particles are completely exposed, thereby improving the demagnetization effect of the powder. In this embodiment, the screen 41 is a cast iron part to ensure that the screen 41 has good magnetism in the magnetic field to adsorb magnetic particles; it can be understood that it is sufficient to ensure that the screen 41 is an iron part containing iron, and the selection of a cast iron screen 41 can effectively reduce the processing cost of the screen 41.

[0044] Furthermore, the airflow mill 100 further includes a blind plate assembly 50, which is used to cover the waste opening 15 at the bottom of the shell 10. The blind plate assembly 50 includes a cover plate 51 and a magnetic block 52; the cover plate 51 is in a straight plate shape, the cover plate 51 covers the waste opening 15, the magnetic block 52 is connected to the cover plate 51, the communication position between the air pipe 20 and the chamber is located between the screen 41 and the magnetic block 52, the magnetic block 52 is used to generate magnetism at the waste opening 15 of the shell 10, the magnetic block 52 and the screen 41 in the magnetic field simultaneously generate magnetic attraction at the upper and lower sides of the airflow convergence position, the screen 41 adsorbs the magnetic particles in the powder with qualified particle size, and the magnetic block 52 adsorbs the magnetic particles in the material with unqualified particle size, and at the same time ensures that there are no magnetic particles in the powder, and reduces the magnetic anomaly of the powder after crushing.

[0045] Furthermore, the magnetic block 52 is cylindrically convexly arranged on one side of the cover plate 51, and the magnetic block 52 extends from the cover plate 51 into the chamber. The magnetic block 52 is convexly arranged in the chamber to ensure the adsorption effect on the magnetic particles. In the present embodiment, the magnetic block 52 is detachably connected to the cover plate 51, and the blind plate assembly 50 also includes a fixing bolt 53. The fixing bolt 53 passes through the cover plate 51 from the side of the cover plate 51 away from the magnetic block 52, and is threadedly connected to the magnetic block 52 to fix the magnetic block 52 on the cover plate 51, so as to facilitate the cleaning operation of the magnetic particles adsorbed on the magnetic block 52 during maintenance. It can be understood that the screen 41 can also be fixed to the inner wall of the housing 10 in a detachable manner, which is also convenient for the cleaning operation of the magnetic particles on the screen 41 during maintenance. In another embodiment, the magnetic block 52 is fixed to the cover plate 51 by gluing or welding, that is, the magnetic block 52 and the cover plate 51 can also be fixed in a non-detachable manner to ensure that the magnetic block 52 is connected to the cover plate 51 and the magnetic block 52 is set in the chamber.

[0046] Furthermore, the blind plate assembly 50 also includes a protective cover 54. The protective cover 54 is disposed on the outside of the magnetic block 52, the protective cover 54 is coated on the outside of the magnetic block 52, the protective cover 54 fits the magnetic block 52, and the protective cover 54 is used to protect the magnetic block 52. Since the magnetic block 52 is disposed near the airflow convergence position, the protective cover 54 can effectively prevent the magnetic block 52 from being cavitated, thereby extending the service life of the magnetic block 52. In this embodiment, the protective cover 54 is a colloid part or a zirconium oxide part.

[0047] Furthermore, the connection between the cover plate 51 and the housing 10 can be bolted. In another embodiment, in order to improve the disassembly and assembly efficiency between the cover plate 51 and the housing 10, a quick release clamp 60 can be sleeved on the outer side of the joint position between the cover plate 51 and the housing 10. The quick release clamp 60 is in the shape of a ring formed by splicing two semicircular rings. The two semicircular rings of the quick release clamp 60 are closed, so that the quick release clamp 60 is sleeved on the outer side of the joint position between the cover plate 51 and the housing 10, and then the cover plate 51 is fixed on the housing 10. When disassembling, it is only necessary to separate the two semicircular rings, thereby improving the disassembly and assembly efficiency between the cover plate 51 and the housing 10.

[0048] In summary, the embodiment of the utility model provides an air flow mill 100, which blocks the feed port 11 and the discharge port 12 in the chamber by arranging a screen 41, and surrounds the excitation coil 42 at the position corresponding to the screen 41 on the outside of the shell 10. The excitation coil 42 makes the screen 41 magnetic, and then adsorbs the magnetic particles in the process of screening the material, thereby demagnetizing the crushed material and reducing the magnetic anomaly of the crushed material. Moreover, since the powder in the chamber is in a fully dispersed state due to the high-speed airflow, the screen 41 adsorbs the magnetic particles in the dispersed powder, effectively improving the demagnetization effect of the powder, and there is no need to perform a separate demagnetization adsorption operation subsequently, thereby reducing the production cost.

[0049] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A jet mill (100), characterized in that: include: A shell (10), wherein a chamber is arranged in the shell (10); a feed port (11) and a discharge port (12) are arranged on the shell (10), and the feed port (11) and the discharge port (12) are both connected to the chamber; an air pipe (20) connected to the shell (10), the air pipe (20) being in communication with the chamber, and the air pipe (20) being used to blow high-pressure gas into the chamber to crush the material fed from the feed port (11); an exhaust component (30), the exhaust component (30) being arranged at one end of the shell (10) close to the discharge port (12), the exhaust component (30) being used to discharge the gas in the chamber from the discharge port (12); and A screening component (40), the screening component (40) comprising a screen (41) and an excitation coil (42); the screen (41) is installed in the chamber, the screen (41) blocks the feed port (11) and the discharge port (12), the excitation coil (42) is arranged around the outer side of the shell (10), the position of the excitation coil (42) corresponds to that of the screen (41), and the excitation coil (42) is used to generate a magnetic field when energized so that the screen (41) has magnetic properties.

2. The jet mill (100) according to claim 1, characterized in that: The periphery of the screen (41) is connected and fixed to the inner wall of the shell (10).

3. The jet mill (100) according to claim 2, characterized in that: The screen (41) is a cast iron part.

4. The jet mill (100) according to claim 1, characterized in that: A waste material outlet (15) is provided at one end of the shell (10) away from the discharge port (12); the air flow mill (100) further comprises a blind plate assembly (50), the blind plate assembly (50) comprises a cover plate (51) and a magnetic block (52), the cover plate (51) covers the waste material outlet (15), and the magnetic block (52) is connected to the cover plate (51).

5. The jet mill (100) according to claim 4, characterized in that: The communication position between the air pipe (20) and the chamber is located between the screen (41) and the magnetic block (52).

6. The jet mill (100) according to claim 4, characterized in that: The magnetic block (52) is extended from the cover plate (51) into the chamber.

7. The jet mill (100) according to claim 6, characterized in that: The magnetic block (52) is detachably connected to the cover plate (51), and the blind plate assembly (50) further comprises a fixing bolt (53); the fixing bolt (53) passes through the cover plate (51) from a side of the cover plate (51) away from the magnetic block (52), and is threadedly connected to the magnetic block (52).

8. The jet mill (100) according to claim 4, characterized in that: The blind plate assembly (50) further comprises a protective cover (54); the protective cover (54) is arranged to cover the outer side of the magnetic block (52); the protective cover (54) is a colloid part or a zirconium oxide part.

9. The jet mill (100) according to claim 1, characterized in that: The exhaust assembly (30) comprises a driving member (31) and an impeller (32); the driving member (31) is connected to the housing (10), the impeller (32) is arranged in the chamber, and the driving member (31) is used to drive the impeller (32) to rotate.

10. The jet mill (100) according to claim 1, characterized in that: The number of the air pipes (20) is plural, and the air pipes (20) are arranged at intervals around the shell (10), and the connecting position between the air pipes (20) and the chamber is located on the side of the feed port (11) away from the discharge port (12).

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