Receiving tank for jet mill

Abstract

The invention provides a material receiving tank for jet mills, and belongs to the technical field of jet mills, the material receiving tank comprises an upper tank body and a lower tank body which are communicated with each other, an air inlet structure is arranged at the upper tank body or the lower tank body or at the joint of the upper tank body and the lower tank body, and an air outlet of the air inlet structure is communicated with the internal space of the material receiving tank; and an air inlet of the air inlet structure is communicated with an external air source. An external air source is introduced into the material receiving tank through the air inlet structure to impact powder in the material receiving tank, on one hand, the powder can be further refined, on the other hand, the mixing uniformity of the powder is improved, the subsequent powder mixing procedure is reduced, and therefore the production efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of air flow mills and relates to a material receiving tank, in particular to a material receiving tank for air flow mills. Background Art

[0002] Since the advent of the jet mill in the 1930s, it has been widely used in the preparation of ultrafine powders of rare earth permanent magnet metal materials, ceramic materials and chemical raw materials. Its working principle mainly relies on the impact and friction of high-speed airflow and materials to crush the materials. The crushed materials are screened by the sorting wheel. The materials that do not meet the particle size requirements continue to be ground to the target particle size in the grinding chamber, and the materials that meet the particle size requirements are collected in the receiving tank.

[0003] The traditional receiving tank only has the functions of receiving, transferring and protecting materials and preventing air from entering. After the air jet milling process is completed, the air jet mill powder needs to be transferred from the receiving tank to the mixing tank. At the same time, this process needs to prevent oxidation. The mixing process must also be carried out in the mixing tank to make the materials mixed evenly, and the production efficiency is low. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems in the prior art and to provide a material receiving tank for a jet mill which has a powder mixing function and can improve the working efficiency.

[0005] The purpose of the present invention can be achieved by the following technical scheme: A material receiving tank for air jet mill, comprising:

[0006] An upper tank body and a lower tank body are interconnected, wherein an air intake structure is arranged on the upper tank body or the lower tank body, or at the connection between the upper tank body and the lower tank body, and the air outlet of the air intake structure is connected to the internal space of the receiving tank, and the air inlet of the air intake structure is connected to an external air source.

[0007] In the above-mentioned material receiving tank for air flow mill, when the air intake structure is arranged on the lower tank body, the air intake structure is arranged at the bottom of the lower tank body, or at the side of the lower tank body; when the air intake structure is arranged on the upper tank body, the air intake structure is arranged at the side of the upper tank body.

[0008] In the above-mentioned material receiving tank for air flow mill, the air intake structure includes at least one air intake pipe, which is hollow, and the air outlet of the air intake pipe is connected to the upper tank body or the lower tank body and communicated with the interior of the material receiving tank. The air intake of the air intake pipe is located outside the material receiving tank and communicated with an external air source.

[0009] In the above-mentioned material receiving tank for the air flow mill, when there are multiple air inlet pipes, the multiple air inlet pipes are distributed in a straight line, wherein in the same area, the distance between any two adjacent air inlet pipes is equal.

[0010] In the above-mentioned material receiving tank for air flow mill, the air inlet pipe located at the bottom of the lower tank body is the air inlet pipe A, the three air inlet pipes are respectively the air inlet pipe A1, the air inlet pipe A2 and the air inlet pipe A3, and the air inlet pipe A1, the air inlet pipe A2 and the air inlet pipe A3 are horizontally arranged from left to right; the air inlet pipe located at the side of the lower tank body is the air inlet pipe B, the three air inlet pipes are respectively the air inlet pipe B1, the air inlet pipe B2 and the air inlet pipe B3, and the air inlet pipe B1, the air inlet pipe B2 and the air inlet pipe B3 are vertically arranged from top to bottom; the air inlet pipe located at the side of the upper tank body is the air inlet pipe C, the three air inlet pipes are respectively the air inlet pipe C1, the air inlet pipe C2 and the air inlet pipe C3, and the air inlet pipe C1, the air inlet pipe C2 and the air inlet pipe C3 are obliquely arranged from top to bottom.

[0011] In the above-mentioned material receiving tank for air flow mill, when air intake pipe A is working and air intake pipe B and air intake pipe C are not working, circulating air is formed between air intake pipe A1, air intake pipe A2 and air intake pipe A3; when air intake pipe B is working and air intake pipe A and air intake pipe C are not working, circulating air is formed between air intake pipe B1, air intake pipe B2 and air intake pipe B3; when air intake pipe C is working and air intake pipe A and air intake pipe B are not working, circulating air is formed between air intake pipe C1, air intake pipe C2 and air intake pipe C3.

[0012] In the above-mentioned material receiving tank for air flow mill, when the air intake pipes A and B are working and the air intake pipe C is not working, circulating air is formed between the air intake pipes A1, A2, A3, B1, B2 and B3; when the air intake pipes A and C are working and the air intake pipe B is not working, circulating air is formed between the air intake pipes A1, A2, A3, C1, C2 and C3; when the air intake pipes B and C are working and the air intake pipe A is not working, circulating air is formed between the air intake pipes B1, B2, B3, C1, C2 and C3.

[0013] In the above-mentioned material receiving tank for air flow mill, when air inlet pipe A, air inlet pipe B and air inlet pipe C are all working, circulating air is formed among air inlet pipe A1, air inlet pipe A2, air inlet pipe A3, air inlet pipe B1, air inlet pipe B2, air inlet pipe B3, air inlet pipe C1, air inlet pipe C2 and air inlet pipe C3.

[0014] In the above-mentioned material receiving tank for the air flow mill, the upper tank body is arranged in a truncated cone shape, and the lower tank body is arranged in a columnar shape.

[0015] In the above-mentioned receiving tank for the jet mill, the external gas source is a nitrogen source or an argon source.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention provides a receiving tank for an air flow mill. An external air source is introduced into the receiving tank through an air inlet structure to impact the powder in the receiving tank. On the one hand, the powder can be further refined, and on the other hand, the mixing uniformity of the powder can be improved, and subsequent powder mixing processes can be reduced, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a schematic structural diagram of a material receiving tank for an air flow mill.

[0019] In the figure, 10, upper tank body; 20, lower tank body. DETAILED DESCRIPTION

[0020] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0021] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0022] like Figure 1 As shown, the present invention provides a material receiving tank for a jet mill, comprising:

[0023] An upper tank body 10 and a lower tank body 20 are interconnected, and the upper tank body 10 is arranged in a truncated cone shape, and the lower tank body 20 is arranged in a columnar shape, wherein an air intake structure is arranged at the upper tank body 10 or the lower tank body 20, or at the connection between the upper tank body 10 and the lower tank body 20, and the air outlet of the air intake structure is connected to the internal space of the receiving tank, and the air intake of the air intake structure is connected to an external air source.

[0024] It is worth mentioning that the external gas source can be a nitrogen source or an argon source.

[0025] The present invention provides a receiving tank for an air flow mill. An external air source is introduced into the receiving tank through an air inlet structure to impact the powder in the receiving tank. On the one hand, the powder can be further refined, and on the other hand, the mixing uniformity of the powder can be improved, and subsequent powder mixing processes can be reduced, thereby improving production efficiency.

[0026] It is further pointed out that when the air intake structure is arranged on the lower tank body 20, the air intake structure is arranged at the bottom of the lower tank body 20, or at the side of the lower tank body 20; when the air intake structure is arranged on the upper tank body 10, the air intake structure is arranged at the side of the upper tank body 10.

[0027] It is worth mentioning that the air intake structure includes at least one air intake pipe, which is hollow and has an air outlet connected to the upper tank body 10 or the lower tank body 20 and connected to the interior of the receiving tank. The air inlet of the air intake pipe is located outside the receiving tank and connected to an external air source.

[0028] Further preferably, when there are multiple air intake pipes, the multiple air intake pipes are distributed in a straight line, wherein in the same area, the intervals between any two adjacent air intake pipes are equal.

[0029] In this embodiment, the more the number of air intake pipes is, the larger the coverage area of ​​the region where the air intake pipes are located is, so the more uniform the powder mixing effect is.

[0030] It is worth mentioning that the multiple air intake pipes can also be distributed in a circular shape, or in a regular pattern such as a triangular distribution, or in an irregular pattern.

[0031] In this embodiment, when there are multiple intake pipes, a linear distribution is used as an example for explanation, and the number of intake pipes is three. Among them, the intake pipe located at the bottom of the lower tank body 20 is intake pipe A, and the three intake pipes are intake pipe A1, intake pipe A2 and intake pipe A3, and the intake pipes A1, A2 and A3 are arranged horizontally from left to right, among which the intake pipes A1, A2 and A3 are a group of intake pipes at the bottom of the lower tank body 20; the intake pipe located at the side of the lower tank body 20 is intake pipe B, and the three intake pipes are intake pipe B1, B2 and B3, and the intake pipes B1, B2 and B3 are arranged horizontally from left to right. The air intake pipe B2 and the air intake pipe B3 are arranged vertically from top to bottom, wherein the air intake pipe B1, the air intake pipe B2 and the air intake pipe B3 serve as a group of air intake pipes on the side of the lower tank body 20; the air intake pipe located on the side of the upper tank body 10 is the air intake pipe C, and the three air intake pipes are respectively the air intake pipe C1, the air intake pipe C2 and the air intake pipe C3, and the air intake pipe C1, the air intake pipe C2 and the air intake pipe C3 are arranged obliquely from top to bottom, wherein the air intake pipe C1, the air intake pipe C2 and the air intake pipe C3 serve as a group of air intake pipes on the side of the upper tank body 10.

[0032] It is worth mentioning that since there are multiple intake pipes, the inflation method of the multiple intake pipes in the same position adopts a circular inflation method. Therefore, there are multiple ways to determine which intake pipe is the starting end and which intake pipe is the ending end. In addition, when two groups of intake pipes or three groups of intake pipes work together, there will also be the problem of which intake pipe is the starting end and which intake pipe is the ending end.

[0033] For example, taking the air inlet pipe A at the bottom of the tank body 20 as an example, the inflation sequence may be A1-A2-A3-A1; or the inflation sequence may be A3-A2-A1-A3; or the inflation sequence may be A2-A1-A3-A2; or the inflation sequence may be A2-A3-A1-A2.

[0034] For another example, taking the air inlet pipe A at the bottom of the lower tank body 20 and the air inlet pipe B at the side of the lower tank body 20 as examples, the inflation sequence may be A1-A2-A3-B1-B2-B3-A1; or the inflation sequence may be A1-B1-A2-B2-A3-B3-A1 and so on.

[0035] It is worth mentioning that, according to experiments, no matter which circulation method is adopted, the influence on the powder mixing effect is small and can be ignored. Therefore, for the convenience of description, the inflation circulation sequence of a single group or multiple groups of air intake pipes is specified. When the bottom of the lower tank body 20 is inflated, the inflation circulation sequence is A1-A2-A3-A1, that is, it is inflated in sequence from left to right; when the side of the lower tank body 20 is inflated, the inflation circulation sequence is B1-B2-B3-B1, that is, it is inflated in sequence from top to bottom; when the side of the upper tank body 10 is inflated, the inflation circulation sequence is C1-C2-C3-C1, that is, it is inflated in sequence from top to bottom; when the bottom of the lower tank body 20 and the side of the lower tank body 20 are inflated, the inflation circulation sequence is A1-B1-A2-B2- A3-B3-A1; when the bottom of the lower tank body 20 and the side of the upper tank body 10 are inflated, the inflation cycle sequence is A1-C1-A2-C2-A3-C3-A1; when the side of the lower tank body 20 and the side of the upper tank body 10 are inflated, the inflation cycle sequence is B1-C1-B2-C2-B3-C3-B1; when the bottom of the lower tank body 20, the side of the lower tank body 20 and the side of the upper tank body 10 are inflated, the inflation cycle sequence is A1-B1-C1-A2-B2-C2-A3-B3-C3-A1.

[0036] In addition, by setting an air intake structure on the receiving tank, the powder mixing performance is improved, thereby reducing the subsequent powder mixing process, which involves two parameters, namely the average particle size SMD value of the powder and D 90 / D 10 The ratio of 90 Indicates that 90% of the powder particle size is smaller than this value, D 10 Indicates that 10% of the powder particle size is smaller than this value, and D 90 / D 10 The smaller the value, the more uniform the particle size.

[0037] Embodiment 1

[0038] During the jet milling process, the air inlet pipe A at the bottom of the lower tank body 20 is connected to the external nitrogen source, the air inlet pipe B on the side of the lower tank body 20 and the air inlet pipe C on the side of the upper tank body 10 are in a closed state, and nitrogen is automatically filled into the receiving tank at intervals of 1s through the control device. The filling sequence is A1-A2-A3-A1. The grinding is 4h without the powder mixing process. The powder particle size and distribution are measured. Among them, the average particle size SMD of the powder is 4.61, and the uniformity D 90 / D 10 =5.82.

[0039] Embodiment 2

[0040] During the jet milling process, the air inlet pipe B on the side of the lower tank body 20 is connected to the external nitrogen source, the air inlet pipe A at the bottom of the lower tank body 20 and the air inlet pipe C on the side of the upper tank body 10 are in a closed state, and nitrogen is automatically filled into the receiving tank at intervals of 1s through the control device. The filling sequence is B1-B2-B3-B1. The grinding is 4h without the powder mixing process. The powder particle size and distribution are measured. Among them, the average particle size SMD of the powder is 4.65, and the uniformity D 90 / D 10 =7.15.

[0041] Embodiment 3

[0042] During the jet milling process, the air inlet pipe C on the side of the upper tank body 10 is connected to the external nitrogen source, the air inlet pipe A at the bottom of the lower tank body 20 and the air inlet pipe B on the side of the lower tank body 20 are in a closed state, and nitrogen is automatically filled into the receiving tank at intervals of 1s through the control device. The filling sequence is C1-C2-C3-C1. The grinding is 4h without the powder mixing process. The powder particle size and distribution are measured. Among them, the average particle size SMD of the powder is 4.70, and the uniformity D 90 / D 10 =8.06.

[0043] Embodiment 4

[0044] During the jet milling process, the air inlet pipe A at the bottom of the lower tank body 20 and the air inlet pipe B on the side of the lower tank body 20 are connected to the external nitrogen source, and the air inlet pipe C on the side of the upper tank body 10 is in a closed state, and the control device automatically fills the receiving tank with nitrogen at intervals of 1s. The filling sequence is A1-B1-A2-B2-A3-B3-A1. The grinding is 4h without the powder mixing process. The powder particle size and distribution are measured. Among them, the average particle size SMD of the powder is 4.60, and the uniformity D 90 / D 10 =5.70.

[0045] Embodiment 5

[0046] During the jet milling process, the air inlet pipe A at the bottom of the lower tank body 20 and the air inlet pipe C on the side of the upper tank body 10 are connected to the external nitrogen source, and the air inlet pipe B on the side of the lower tank body 20 is in a closed state, and the control device automatically fills the receiving tank with nitrogen at intervals of 1s. The filling sequence is A1-C1-A2-C2-A3-C3-A1. The grinding is 4h without the powder mixing process. The powder particle size and distribution are measured. Among them, the average particle size SMD of the powder is 4.60, and the uniformity D 90 / D 10 =5.73.

[0047] Embodiment 6

[0048] During the jet milling process, the air inlet pipe B on the side of the lower tank body 20 and the air inlet pipe C on the side of the upper tank body 10 are connected to the external nitrogen source, and the air inlet pipe A at the bottom of the lower tank body 20 is in a closed state, and the control device automatically fills the material receiving tank with nitrogen at intervals of 1s. The filling sequence is B1-C1-B2-C2-B3-C3-B1. The grinding is 4h without the powder mixing process. The powder particle size and distribution are measured. Among them, the average particle size SMD of the powder is 4.64, and the uniformity D 90 / D 10 =7.50.

[0049] Embodiment 7

[0050] During the jet milling process, the air inlet pipe A at the bottom of the lower tank body 20, the air inlet pipe B at the side of the lower tank body 20, and the air inlet pipe C at the side of the upper tank body 10 are connected to the external nitrogen source, and the control device automatically fills the material receiving tank with nitrogen at intervals of 1s. The filling sequence is A1-B1-C1-A2-B2-C2-A3-B3-C3-A1. The grinding is 4h without the powder mixing process. The powder particle size and distribution are measured. Among them, the average particle size SMD of the powder is 4.60, and the uniformity D 90 / D 10 =5.65.

[0051] Embodiment 8

[0052] During the jet milling process, the air inlet pipe B on the side of the lower tank body 20 is connected to the external nitrogen source, the air inlet pipe A at the bottom of the lower tank body 20 and the air inlet pipe C on the side of the upper tank body 10 are in a closed state, and nitrogen is automatically filled into the receiving tank at intervals of 2s through the control device. The filling sequence is B1-B2-B3-B1. The grinding is 4h without the powder mixing process. The powder particle size and distribution are measured. Among them, the average particle size SMD of the powder is 4.64, and the uniformity D 90 / D 10 =5.96.

[0053] Comparative Example 1

[0054] During the airflow grinding process, the receiving tank was not connected to an external air source and no air was added to the receiving tank. After grinding for 4 hours, the powder particle size and distribution were measured. The average particle size SMD of the powder was 5.30, and the uniformity D 90 / D 10 =10.92, and after mixing for 1 hour, the average particle size SMD of the powder was measured to be 4.60, and the uniformity D 90 / D 10 =5.78.

[0055] In this embodiment, compared with the first to eighth embodiments and the comparative example 1, an air intake structure is provided on the receiving tank, and automatic and intermittent air charging is performed during the airflow milling process, so that the purpose of powder mixing can be achieved. Among them, when the air charging position includes the air intake pipe at the bottom of the lower tank body 20, the powder particle size and uniformity are similar to the values ​​of the powder particle size and uniformity obtained through the powder mixing process, so the powder mixing process can be reduced, thereby achieving the purpose of improving work efficiency. In addition, by extending the intermittent time, the uniformity of the powder particle size can be further improved.

[0056] It should be noted that in the present invention, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. 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 "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. The terms "connected", "fixed", etc. should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected 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 the specific circumstances.

[0057] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0058] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A receiving tank for a jet mill, characterized in that: include: An upper tank body and a lower tank body are interconnected, wherein an air intake structure is arranged on the upper tank body or the lower tank body, or at the connection between the upper tank body and the lower tank body, and the air outlet of the air intake structure is connected to the internal space of the receiving tank, and the air inlet of the air intake structure is connected to an external air source.

2. The receiving tank for a jet mill according to claim 1, characterized in that: When the air intake structure is arranged on the lower tank body, the air intake structure is arranged at the bottom of the lower tank body, or at the side of the lower tank body; when the air intake structure is arranged on the upper tank body, the air intake structure is arranged at the side of the upper tank body.

3. The receiving tank for the jet mill according to claim 2, characterized in that: The air intake structure includes at least one air intake pipe, which is hollow and has an air outlet connected to the upper tank body or the lower tank body and communicated with the interior of the receiving tank. The air inlet of the air intake pipe is located outside the receiving tank and communicated with an external air source.

4. The material receiving tank for the jet mill according to claim 3, characterized in that: When there are multiple intake pipes, the multiple intake pipes are distributed in a straight line, wherein in the same area, the intervals between any two adjacent intake pipes are equal.

5. The material receiving tank for the jet mill according to claim 4, characterized in that: The air intake pipe located at the bottom of the lower tank body is the air intake pipe A, and the three air intake pipes are respectively the air intake pipe A1, the air intake pipe A2 and the air intake pipe A3, and the air intake pipe A1, the air intake pipe A2 and the air intake pipe A3 are horizontally arranged in sequence from left to right; the air intake pipe located at the side of the lower tank body is the air intake pipe B, and the three air intake pipes are respectively the air intake pipe B1, the air intake pipe B2 and the air intake pipe B3, and the air intake pipe B1, the air intake pipe B2 and the air intake pipe B3 are vertically arranged in sequence from top to bottom; the air intake pipe located at the side of the upper tank body is the air intake pipe C, and the three air intake pipes are respectively the air intake pipe C1, the air intake pipe C2 and the air intake pipe C3, and the air intake pipe C1, the air intake pipe C2 and the air intake pipe C3 are obliquely arranged in sequence from top to bottom.

6. The receiving tank for the jet mill according to claim 5, characterized in that: When intake pipe A is working and intake pipe B and intake pipe C are not working, circulating air is formed between intake pipe A1, intake pipe A2 and intake pipe A3; when intake pipe B is working and intake pipe A and intake pipe C are not working, circulating air is formed between intake pipe B1, intake pipe B2 and intake pipe B3; when intake pipe C is working and intake pipe A and intake pipe B are not working, circulating air is formed between intake pipe C1, intake pipe C2 and intake pipe C3.

7. The receiving tank for the jet mill according to claim 5, characterized in that: When intake pipe A and intake pipe B are working and intake pipe C is not working, circulating air is formed among intake pipe A1, intake pipe A2, intake pipe A3, intake pipe B1, intake pipe B2 and intake pipe B3; when intake pipe A and intake pipe C are working and intake pipe B is not working, circulating air is formed among intake pipe A1, intake pipe A2, intake pipe A3, intake pipe C1, intake pipe C2 and intake pipe C3; when intake pipe B and intake pipe C are working and intake pipe A is not working, circulating air is formed among intake pipe B1, intake pipe B2, intake pipe B3, intake pipe C1, intake pipe C2 and intake pipe C3.

8. The receiving tank for a jet mill according to claim 5, characterized in that: When the intake pipe A, the intake pipe B and the intake pipe C are all working, a circulating air charge is formed among the intake pipes A1, A2, A3, B1, B2, B3, C1, C2 and C3.

9. A material receiving tank for a jet mill according to any one of claims 1 to 8, characterized in that: The upper tank body is arranged in a truncated cone shape, and the lower tank body is arranged in a column shape.

10. A material receiving tank for a jet mill according to any one of claims 1 to 8, characterized in that: The external gas source is a nitrogen source or an argon source.

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