Target type jet mill

Abstract

The utility model relates to a target type jet mill which comprises a cylindrical barrel, and a fine powder channel and a coarse powder channel are formed in a grading chamber; the powder grader is mounted in the grading chamber, and a powder outlet of the powder grader is connected with the fine powder channel; the powder supply device is connected with the powder feeding chamber and is suitable for feeding powder into the powder feeding chamber; the powder spraying pipe is installed on the barrel of the powder crushing chamber, an inlet of the powder spraying pipe is connected with a first Venturi powder pump, and a powder return pipe is connected between the first Venturi powder pump and the coarse powder channel. The particle size of the separated crushed powder can be controlled through the powder grader, selection control is carried out in a large particle size range, fine powder meeting the set requirement is discharged from the fine powder channel, coarse powder is collected for centralized treatment while the fine powder is discharged and collected in time, and therefore the powder quality is improved. Coarse powder enters the second Venturi pump through the coarse powder channel and is sprayed out again to be smashed, and the smashing efficiency and quality are improved.

Description

Technical Field

[0001] The utility model relates to the field of powder crushing equipment, in particular to a target-type air flow mill. Background Art

[0002] Target jet mill is relatively rare in jet mills. Its principle is similar to that of fluidized bed jet mill, except that the pulverization method is that the high-speed airflow and powder collide with the rigid target head to achieve pulverization. The most common and advanced target jet mill is the disc target jet mill. Figure 1 As shown, a mixing cylinder 11 and a separation disc 12 are provided, and two target heads and two venturi pumps are provided in the mixing cylinder. When the first venturi pump 13 sends new powder into the mixing cylinder, the new powder hits the first target head 131 to achieve crushing of the new powder. When the second venturi pump 14 sends coarse powder into the mixing cylinder, the coarse powder hits the second target head 141 to achieve crushing of the coarse powder. After the two powders are mixed in the mixing cylinder, they enter the separation disc 12 together with the air flow. The principle of the separation disc 12 is similar to that of a cyclone separator. The air flow and powder rotate in the disc. The large particles of powder have a large centrifugal force and run along the edge of the disc. The finer powder is easily sucked away by the exhaust pipe in the middle of the disc. A middle circular hole is opened in the middle of the separation disc, and the middle circular hole is connected to the exhaust pipe. The exhaust pipe is then connected to the cyclone separator or other powder collection equipment behind it for collection. The powder rotating along the side wall of the disc will enter the coarse powder pipe, which is connected to the second Venturi pump. Driven by the high-pressure gas of the second Venturi pump, it enters the mixing and conveying pipe, and then is ejected at a very high speed and directly hits the second rigid target head. The gas and powder will continue forward and enter the disc classifier together with the airflow and powder hit by the first target head.

[0003] Current target jet mills have drawbacks: insufficient classification performance and difficulty in operational control. In particular, they offer limited control over product particle size. For example, if a disc with a fixed diameter is to be adjusted for particle size, the only way to do so is by adjusting the air flow rate. This adjustment range is very limited, resulting in a narrow particle size range. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a target-type airflow mill to solve the technical problems of narrow particle size adjustment range and insufficient particle size adjustment force in the powder making process of the traditional target-type airflow mill.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] First aspect:

[0007] Provided is a target-type air jet mill, comprising

[0008] A cylindrical barrel, wherein a grading chamber, a powder feeding chamber and a powder crushing chamber are sequentially arranged in the barrel from top to bottom. A fine powder channel and a coarse powder channel are provided on the grading chamber, and the fine powder channel is connected to the exhaust system;

[0009] A powder classifier is installed in the classification chamber, the powder outlet of the powder classifier is connected to the fine powder channel, and the powder classifier is suitable for classifying the powder in the classification chamber and sending the separated fine powder out of the fine powder channel;

[0010] A powder feeding device, connected to the powder feeding chamber and adapted to feed powder into the powder feeding chamber;

[0011] At least one powder nozzle and a target head, the target head is installed in the powder crushing chamber, the powder nozzle is installed on the barrel of the powder crushing chamber, the powder nozzle inlet is connected to the first Venturi powder pump, the powder nozzle outlet is toward the target head, and the first Venturi powder pump and the coarse powder channel are connected back to the powder pipe.

[0012] Furthermore, the number of the powder nozzles and the number of the target heads are both two.

[0013] Furthermore, the grading chamber and the powder feeding chamber are both cylindrical chambers.

[0014] Furthermore, the powder classifier and the fine powder channel are both located at the top center of the classification chamber;

[0015] The fine powder channel is opened at the center position of the top of the classification chamber, and the coarse powder channel is opened at the side wall position of the top of the classification chamber.

[0016] Furthermore, the powder supply device includes a powder inlet pipe and a second Venturi powder pump. The powder inlet pipe is tangentially arranged on the cylinder. The second Venturi powder pump delivers new powder into the powder inlet chamber through the powder inlet pipe, so that the new powder rotates circumferentially in the powder inlet chamber.

[0017] Furthermore, the powder classifier is an impeller classifier.

[0018] Furthermore, the powder feeding device adopts a screw feeder.

[0019] Furthermore, the powder supply device includes

[0020] A powder inlet cylinder and a second Venturi powder pump, wherein the outlet of the powder inlet cylinder is tangentially connected to the cylinder body, the second Venturi powder pump is connected to the powder inlet cylinder, and a target head is provided in the powder inlet cylinder;

[0021] When the second Venturi powder pump delivers new powder into the powder inlet tube, the new powder collides with the target head, causing the new powder to be broken and then tangentially fed into the powder inlet chamber.

[0022] Second aspect:

[0023] A powder making method is provided, which adopts the above-mentioned target-type air flow mill, including: new powder is fed into a powder inlet chamber through a powder feeding device, the new powder enters a classification chamber upward under the action of a new powder exhaust system, the powder classifier discharges the separated fine powder from the fine powder channel, and the remaining coarse powder is sucked into a first Venturi powder pump through a powder return pipe, and is carried by the high-pressure airflow ejected from the powder nozzle and ejected to collide with the target head, thereby crushing the powder, and the crushed powder enters the classification chamber upward again for powder classification, the fine powder that meets the requirements is extracted, and the coarse powder is returned to the powder nozzle for collision again.

[0024] Furthermore, new powder enters the powder inlet chamber through the tangentially arranged powder inlet pipe, driving the new powder to rotate circumferentially in the powder inlet chamber. The rotation direction of the new powder in the cylinder is opposite to the rotation direction of the impeller in the powder classifier.

[0025] The beneficial effects of the utility model are:

[0026] The powder classifier can control the particle size of the crushed powder and perform selective control within a wide range of particle sizes. Fine powder that meets the set requirements is discharged from the fine powder channel. While the fine powder is discharged and collected in a timely manner, the coarse powder is collected and centrally processed. The coarse powder enters the second Venturi pump through the coarse powder channel for further crushing, thereby improving the powder crushing efficiency and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below with reference to the accompanying drawings.

[0028] Figure 1 This is a schematic diagram of a traditional disc target jet mill;

[0029] Figure 2 This is a schematic diagram of the target-type air jet mill (single target head) of the utility model;

[0030] Figure 3 This is a schematic diagram of the target-type air jet mill (double target heads) of the utility model;

[0031] Figure 4 It is a schematic diagram of the target jet mill with powder introduced into the powder barrel;

[0032] in,

[0033] 2. Cylinder, 21. Fine powder channel, 22. Coarse powder channel;

[0034] 3. Powder classifier, 31. Motor, 32. Powder classifying impeller;

[0035] 41. First Venturi powder pump, 42. Second Venturi powder pump;

[0036] 5. Target head;

[0037] 6. Powder inlet pipe. DETAILED DESCRIPTION

[0038] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0039] This application provides a target-type jet mill, which is described in detail below. It should be noted that the order in which the following embodiments are described does not limit the preferred order of the embodiments of this application. Furthermore, in the following embodiments, the description of each embodiment has its own emphasis. For portions not detailed in one embodiment, reference can be made to the relevant descriptions of other embodiments.

[0040] To solve the technical problems of narrow particle size adjustment range and insufficient particle size adjustment force in the conventional target-type jet mill during the powder making process, an embodiment of the present application provides a target-type jet mill, which is described in detail below.

[0041] like Figure 2 As shown, a target jet mill includes

[0042] A cylindrical barrel 2 is provided with a grading chamber, a powder feeding chamber, and a powder crushing chamber from top to bottom. A fine powder channel 21 and a coarse powder channel 22 are provided on the grading chamber. The fine powder channel 21 is connected to an exhaust system.

[0043] A powder classifier 3 is installed in the classification chamber, and a powder outlet of the powder classifier 3 is connected to the fine powder channel 21. The powder classifier 3 is suitable for classifying the powder in the classification chamber and sending the separated fine powder out of the fine powder channel 21;

[0044] A powder feeding device, connected to the powder feeding chamber and adapted to feed powder into the powder feeding chamber;

[0045] A powder nozzle and a target head 5, wherein the target head 5 is installed in the powder crushing chamber, the powder nozzle is installed on the barrel 2 of the powder crushing chamber, the inlet of the powder nozzle is connected to the first Venturi powder pump 41, and the outlet of the powder nozzle is toward the target head 5, and the first Venturi powder pump 41 and the coarse powder channel 22 are connected back to the powder pipe.

[0046] In this embodiment, the powder classifier 3 adopts an impeller classifier, which includes a motor 31 and a powder classifying impeller. The powder classifying impeller is located at the entrance of the fine powder channel 21. The motor 31 drives the powder classifying impeller 32 to rotate in the classifying chamber. The fine powder can pass through the powder classifying impeller 32 and enter the fine powder channel. The coarse powder is blocked outside due to the larger centrifugal force. The coarse powder is finally sucked away by the negative pressure of the coarse powder channel 22 on one side.

[0047] like Figure 2 As shown, in this embodiment, there is only one powder nozzle and one target head 5 . The powder nozzle is connected to the bottom of the pulverizing chamber, and the target head 5 is located above the powder nozzle.

[0048] like Figure 3 As shown, there are two powder nozzles and two target heads 5 , the two powder nozzles are symmetrically arranged on the barrel 2 , and the two target heads 5 are symmetrically arranged in the powder crushing chamber.

[0049] In this embodiment, a nozzle is installed at the inner end of the powder nozzle.

[0050] Specifically, as an optional implementation in this embodiment, Figure 2 As shown, the classification chamber and the powder feeding chamber are both cylindrical chambers.

[0051] Specifically, as an optional implementation in this embodiment, Figure 2 As shown, the powder classifier 3 and the fine powder channel 21 are both located at the top center of the classification chamber;

[0052] The fine powder channel 21 is opened at the center of the top of the classification chamber, and the coarse powder channel 22 is opened at the side wall of the top of the classification chamber.

[0053] The cylindrical chamber helps the powder to rotate in the chamber. The powder rotation can separate the coarse powder to the inner wall of the chamber, and the fine powder can be retained in the center, which facilitates the separation of coarse and fine powders.

[0054] Specifically, as an optional implementation in this embodiment, Figure 2 As shown, the powder feeding device includes a powder feed pipe and a second Venturi powder pump 42. The powder feed pipe is tangentially arranged on the cylinder 2. The second Venturi powder pump 42 delivers new powder into the powder feed chamber through the powder feed pipe, so that the new powder rotates circumferentially in the powder feed chamber.

[0055] As another embodiment of the powder feeding device, the powder feeding device adopts a screw feeder. A predetermined amount of powder can be slowly added into the powder feeding chamber through the second venturi powder pump 42.

[0056] The powder supply device adopts the second Venturi powder pump 42, which has the advantage that new powder can be sprayed tangentially into the powder feeding chamber, and the powder rotates tangentially in the powder feeding chamber, thereby preliminarily achieving the separation of coarse powder.

[0057] The powder inlet of the second Venturi powder pump 42 is equipped with a feed hopper. During operation, a predetermined amount of new powder is placed in the feed hopper and then pumped into the cylinder 2 at a required speed through the second Venturi powder pump 42 .

[0058] like Figure 4 As shown, another embodiment of the powder feeding device;

[0059] The powder supply device includes

[0060] A powder inlet tube 6 and a second Venturi powder pump 42, wherein the outlet of the powder inlet tube 6 is tangentially connected to the cylinder body, the second Venturi powder pump 42 is connected to the powder inlet tube 6, and a target head 5 is provided in the powder inlet tube 6;

[0061] When the second Venturi powder pump 42 delivers new powder into the powder inlet tube 6, the new powder collides with the target head 5, causing the new powder to be broken and then tangentially fed into the powder inlet chamber.

[0062] The powder feeding device of this embodiment can first crush the new powder, and then send the crushed powder into the powder feeding chamber, and then the powder after the collision with the target head 5 of the coarse powder at the bottom will go up into the classification chamber. This powder feeding device on the air flow grinding belt can improve the powder making efficiency. Figure 2 In the air flow mill, the new powder is not crushed when it enters the cylinder, and can only be crushed by a target head 5 in the powder crushing chamber, so the powder making efficiency is relatively low.

[0063] Conventional disc target jet mill, see Figure 1 , the fine powder in the separation disc is directly pumped away, and the particle size of the pumped fine powder is not controlled in advance, which leads to the uncontrolled particle size of the coarse powder flowing back, which ultimately affects the powder classification of the target airflow mill during the powder making process. Figure 2 and Figure 3 As shown, the impeller powder classifier 3 is directly mounted on the cylinder 2. The particle size of the crushed powder separated is controlled by adjusting the rotation speed of the powder classifying impeller 32. Selective control can be performed within a wide particle size range. Fine powder that meets the particle size requirements is extracted through the fine powder channel 21, and the remaining coarse powder is collected for centralized processing and pumped into the cylinder 2 through the second Venturi powder pump 42 for target crushing.

[0064] Target jet mill is suitable for crushing materials with high flexibility.

[0065] The target-type jet mill of the present invention operates as follows: new powder is pumped into the barrel 2 via the second Venturi powder pump 42. As the new powder is pumped into the barrel 2 via the powder inlet pipe, it undergoes tangential rotation, driving the powder within the barrel 2 to rotate and separate the coarse powder outward. The motor 31 controls the rotation of the powder-classifying impeller 32, whose speed is controlled by the motor 31. Fine powder meeting the particle size requirements is discharged through the subdivision channel, while the remaining coarse powder enters the first Venturi powder pump 41 via the powder return pipe. The first Venturi powder pump 41 then collides the coarse powder with the target head 5, achieving further crushing of the coarse powder.

[0066] One embodiment of the present application provides a flour-making method, which is described in detail below.

[0067] A powder making method adopts the above-mentioned target air flow mill, including: new powder is sent into the powder inlet chamber through the powder feeding device, and the new powder enters the classification chamber upward under the action of the new powder exhaust system. The powder classifier 3 discharges the separated fine powder from the fine powder channel 21, and the remaining coarse powder is sent to each first Venturi powder pump 41 and the powder nozzle through the powder return pipe. The high-pressure airflow ejected from the powder nozzle carries the coarse powder and collides with the target head 5, thereby crushing the powder. The crushed powder enters the classification chamber again upward for powder classification, the fine powder that meets the requirements is extracted, and the coarse powder is returned to the powder nozzle for collision again.

[0068] Specifically, as an optional implementation in this embodiment, Figure 2 and Figure 3 As shown, new powder enters the powder inlet chamber through a tangentially arranged powder inlet pipe, driving the new powder to rotate circumferentially in the powder inlet chamber. The rotation direction of the new powder in the cylinder 2 is opposite to the rotation direction of the impeller in the powder classifier 3. The rotating powder-carrying airflow and the counter-rotating impeller make the separation of fine powder more selective.

[0069] The various devices selected in this application (components whose specific structures are not described) are all universal standard parts or components known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0070] In the description of the embodiments of the present invention, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0071] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0072] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. There may be other division methods in actual implementation. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed may be through some communication interface, indirect coupling or communication connection of devices or units, which may be electrical, mechanical or other forms.

[0073] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0074] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0075] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. A target jet mill, characterized in that: include A cylindrical barrel (2) is provided with a classification chamber, a powder feeding chamber, and a powder crushing chamber in order from top to bottom in the barrel (2), a fine powder channel (21) and a coarse powder channel (22) are provided on the classification chamber, and the fine powder channel (21) is connected to an exhaust system; A powder classifier (3) is installed in the classification chamber, and a powder outlet of the powder classifier (3) is connected to the fine powder channel (21). The powder classifier (3) is suitable for classifying the powder in the classification chamber and sending the separated fine powder out through the fine powder channel (21); a powder feeding device connected to the powder feeding chamber and adapted to feed powder into the powder feeding chamber; At least one powder nozzle and a target head (5), wherein the target head (5) is installed in the powder crushing chamber, the powder nozzle is installed on the barrel (2) of the powder crushing chamber, the powder nozzle inlet is connected to the first Venturi powder pump (41), the powder nozzle outlet faces the target head (5), and the first Venturi powder pump (41) and the coarse powder channel (22) are connected to the powder pipe.

2. The target jet mill according to claim 1, wherein: The number of the powder nozzles and the number of the target heads (5) are both two.

3. The target jet mill according to claim 1, wherein: The classification chamber and the powder feeding chamber are both cylindrical chambers.

4. The target jet mill according to claim 3, wherein: The powder classifier (3) and the fine powder channel (21) are both located at the top center of the classification chamber; The fine powder channel (21) is opened at the center of the top of the classification chamber, and the coarse powder channel (22) is opened at the side wall of the top of the classification chamber.

5. The target jet mill according to claim 3, wherein: The powder supply device includes a powder feed pipe and a second Venturi powder pump (42). The powder feed pipe is tangentially arranged on the barrel (2). The second Venturi powder pump (42) feeds new powder into the powder feed chamber through the powder feed pipe, so that the new powder rotates circumferentially in the powder feed chamber.

6. The target jet mill according to claim 3, wherein: The powder classifier (3) is an impeller classifier.

7. The target jet mill according to claim 3, wherein: The powder feeding device adopts a screw feeder.

8. The target jet mill according to claim 3, wherein: The powder supply device includes A powder feed barrel (6) and a second Venturi powder pump (42), wherein the outlet of the powder feed barrel (6) is tangentially connected to the barrel body, the second Venturi powder pump (42) is connected to the powder feed barrel (6), and a target head (5) is provided in the powder feed barrel (6); When the second Venturi powder pump (42) delivers new powder into the powder feeding tube (6), the new powder collides with the target head (5), causing the new powder to be broken and then tangentially fed into the powder feeding chamber.

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