CN112138827B

CN112138827B - Jet mill suitable for neodymium iron boron alloy and use method thereof

Info

Publication number: CN112138827B
Application number: CN202010725378.3A
Authority: CN
Inventors: 冯立峰
Original assignee: Ningbo Keke Magnet Industry Co ltd
Current assignee: Ningbo Keke Magnet Industry Co ltd
Priority date: 2020-07-24
Filing date: 2020-07-24
Publication date: 2021-09-28
Anticipated expiration: 2040-07-24
Also published as: CN112138827A

Abstract

The invention discloses an airflow mill suitable for neodymium iron boron alloy and a use method thereof, which are used for crushing metal coarse particles and comprise the following steps: smash the casing, be cylindric hollow structure, inside has crushing chamber, it is provided with two at least second intake pipes to smash the casing side, the second intake pipe with smash the chamber intercommunication, it is provided with first intake pipe to smash the casing top, first intake pipe slope sets up, be provided with the inlet pipe in the first intake pipe, it still is provided with the intercommunication still to smash the casing top smash the discharging pipe in chamber, still include nozzle switching mechanism, the last a plurality of nozzles that set up of nozzle switching mechanism, through the drive nozzle switching mechanism can switch and stretch into nozzle in the first intake pipe. The technical scheme has the advantages that: can switch the nozzle with first air-intake pipe connection through setting up nozzle switching mechanism to can be quick change down damaged nozzle, improve equipment's work efficiency, and reduce the impurity in the product.

Description

Jet mill suitable for neodymium iron boron alloy and use method thereof

Technical Field

The invention relates to the field of neodymium iron boron metal crushing production, in particular to an airflow mill suitable for neodymium iron boron alloy, and also relates to a using method of the airflow mill.

Background

The neodymium-iron-boron magnetic material is a tetragonal crystal formed by neodymium, iron and boron, and is widely used for preparing neodymium-iron-boron magnets. Neodymium iron boron magnets are widely used in electronic products such as hard disks, mobile phones, earphones, and battery powered tools. In the production process of the neodymium iron boron material, crushing processing is needed, and the large-particle metal is generally refined by using an air flow mill in the process.

The jet mill is also called as a jet mill, the grinding mechanism determines the characteristics of wide application range, high finished product fineness and the like, and typical materials comprise: superhard diamond, silicon carbide, metal powder, etc., the high purity requirement: ceramic pigments, medicine, biochemistry, etc., required at low temperature: medicine, PVC.

The jet mill applied in China mainly comprises: flat jet mill, fluidized bed opposite jet mill, circulating tube jet mill, opposite jet mill, and target jet mill. The air flow mills of the several types are widely applied as flat air flow mills, fluidized bed opposite-spraying air flow mills and circulating pipe air flow mills. The high-pressure airflow as crushing kinetic energy enters a pressure-stabilizing air storage bag at the periphery of the crushing cavity as an airflow distribution station, the airflow is accelerated to form supersonic airflow through a Laval nozzle and then enters the crushing and grinding cavity, and meanwhile, the material is accelerated through a Venturi nozzle and is guided into the crushing and grinding cavity for synchronous crushing.

However, in the use of the apparatus, the nozzle is easily worn and deformed due to the friction between the nozzle and air and the strong collision between the nozzle and the material, which on one hand causes disturbance of the air flow and influences the flow rate, and on the other hand also causes the material of the nozzle to fall off and influences the purity of the processed material.

Disclosure of Invention

Therefore, the air flow mill convenient for switching the nozzles is needed to solve the problems, the nozzles can be conveniently switched in the production and manufacturing process so as to replace damaged nozzles, the working efficiency of equipment is improved, and impurities in products are reduced.

The invention discloses an airflow mill for producing neodymium iron boron alloy, which is used for crushing metal coarse particles and comprises the following components: smash the casing, be cylindric hollow structure, inside has crushing chamber, it is provided with two at least second intake pipes to smash the casing side, the second intake pipe with smash the chamber intercommunication, it is provided with first intake pipe to smash the casing top, first intake pipe slope sets up, and with smash the casing intercommunication, be provided with the inlet pipe in the first intake pipe, be used for to pour metal coarse grain in the first intake pipe, it still is provided with the intercommunication still to smash the casing top smash the discharging pipe in chamber, still include nozzle switching mechanism, be provided with a plurality of nozzles on the nozzle switching mechanism, through the drive nozzle switching mechanism can switch and stretch into nozzle in the first intake pipe.

In one embodiment, the jet mill for producing the neodymium iron boron alloy comprises a third air inlet pipe, the nozzle switching mechanism is arranged between the first air inlet pipe and the third air inlet pipe, and the nozzle can be connected to the third air inlet pipe so as to fill air into the first air inlet pipe.

In one embodiment, the nozzle switching mechanism includes: the supporting frame is arranged at the top of the crushing shell; the rotating disc is rotatably connected to the supporting frame, at least two nozzle mounting holes are formed in the rotating disc, and nozzles are arranged in the nozzle mounting holes; the nozzle bracket is arranged in the nozzle mounting hole and can support the nozzle; the first elastic piece is arranged between the nozzle bracket and the turntable; and the driving piece is arranged on the third air inlet pipe, can push the nozzle to stretch into the first air inlet pipe and is in sealing connection with the nozzle.

In one embodiment, the driving member is screwed to the third air inlet pipe, and by rotating the driving member, the driving member can drive the nozzle to extend into the first air inlet pipe and simultaneously press the first elastic member.

In one embodiment, the nozzle support comprises a slide rod part, a pressing part and a supporting part, the slide rod part can slide on the rotating disc, the pressing part abuts against the first elastic part, and the supporting part supports the nozzle.

In one embodiment, the end part of the feeding pipe is provided with a sealing assembly, the sealing assembly comprises a shell arranged outside the first air inlet pipe and a sliding sealing block arranged in the shell, a volume-variable inflation cavity is formed between the sliding sealing block and the shell, the first air inlet pipe is communicated with the inflation cavity, the sliding sealing block is provided with a first sealing inclined surface, when the inflation cavity is filled with gas, the sliding sealing block moves to the outer side of the nozzle, and the first sealing inclined surface is tightly attached to the outer side of the nozzle to play a sealing role.

In one embodiment, the inclination angle of the first sealing inclined plane is a, and a is more than or equal to 5 degrees and less than or equal to 20 degrees.

In one embodiment, a flexible sealing layer is disposed on the first sealing ramp.

In one embodiment, a second sealing inclined surface is arranged on the nozzle, and the second sealing inclined surface can be matched with the first sealing inclined surface to play a sealing role.

In one embodiment, the inclination angle of the second sealing inclined plane is b, and the angle of a-b is more than or equal to 0 degrees and less than or equal to 5 degrees.

In addition, the invention also discloses a using method of the jet mill, which comprises the following steps: s10: when the jet mill is in use, the coarse particles are driven to rotate at a high speed by utilizing high-speed airflow, so that the coarse particles collide with each other, and the effect of crushing the coarse particles is achieved; s20: and in the air flow grinding process, the nozzle is switched by the nozzle switching mechanism.

The technical scheme has the advantages that: can switch the nozzle with first air-intake pipe connection through setting up nozzle switching mechanism to can be quick change down damaged nozzle, improve equipment's work efficiency, and reduce the impurity in the product.

Drawings

Fig. 1 is a perspective view of an air flow mill for producing neodymium iron boron alloy provided by the invention.

Fig. 2 is a perspective view of a part of the structure of the jet mill for producing neodymium iron boron alloy provided by the invention.

Fig. 3 is a front view of an air flow mill for producing neodymium iron boron alloy according to the present invention.

Fig. 4 is a cross-sectional view taken along plane a-a of fig. 3 in accordance with the present invention.

Fig. 5 is a partial sectional view at B of fig. 4 provided by the present invention.

Fig. 6 is a partial cross-sectional view of a variation of the structure according to fig. 5, showing the structure of the nozzle after it is connected to the first and second inlet pipes.

Fig. 7 is a perspective view of a nozzle holder for producing ndfeb alloy according to the present invention.

Fig. 8 is a perspective view of a nozzle for producing neodymium iron boron alloy according to the present invention.

Fig. 9 is a cross-sectional view of a nozzle and a sealing sliding block for producing neodymium iron boron alloy according to the present invention.

In the figure, the jet mill 100 for producing neodymium iron boron alloy, the crushing shell 10, the first air inlet pipe 20, the third air inlet pipe 21, the feed pipe 30, the discharge pipe 40, the second air inlet pipe 50, the nozzle switching mechanism 60, the support frame 61, the turntable 62, the nozzle bracket 63, the sliding rod part 631, the extrusion part 632, the support part 633, the first elastic part 64, the driving part 65, the nozzle 70, the second sealing inclined surface 71, the sealing assembly 80, the shell 81, the sliding sealing block 82, the first sealing inclined surface 821 and the inflation cavity 83.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1, the present invention provides an air flow mill 100 for producing ndfeb alloy, which is used for pulverizing coarse particles of ndfeb alloy, and the structure of the air flow mill comprises: smash casing 10, be cylindric hollow structure, inside has crushing chamber, it is provided with two at least second intake pipes 50 to smash casing 10 side, second intake pipe 50 with smash the chamber intercommunication, it is provided with first intake pipe 20 to smash casing 10 top, first intake pipe 20 slope sets up, and with smash casing 10 intercommunication, be provided with inlet pipe 30 on the first intake pipe 20, be used for to pour metal coarse grain into in the first intake pipe 20, it still is provided with the intercommunication still to smash casing 10 top smash the discharging pipe 40 in chamber, still includes nozzle switching mechanism 60, be provided with a plurality of nozzles 70 on the nozzle switching mechanism 60, through the drive nozzle switching mechanism 60 can switch and stretch into nozzle 70 in the first intake pipe 20.

It should be noted that, when the jet mill is in use, the high-speed airflow is used for driving the coarse particles to rotate at a high speed, so that the coarse particles are violently collided with each other, and the effect of crushing the coarse particles is achieved. The nozzle 70 is used to accelerate the air flow, but the nozzle 70 is easily damaged by the impact of the high-speed air flow and the impact of partial particles, which causes turbulence of the high-speed air flow, and the dropped material enters the processed metal particles to form impurities, which affect the quality of the product, so that the nozzle 70 needs to be replaced periodically after being used for a certain period of time.

It is understood that the nozzle 70 is switched quickly by providing the nozzle switching mechanism 60 in the present embodiment.

In addition, it is worth mentioning that when neodymium iron boron alloy particles with different particle sizes need to be processed, the type of the nozzle 70 can be switched by the nozzle switching mechanism 60, so as to change the caliber size of the nozzle 70, and balance between a higher spraying speed and a larger spraying amount is achieved.

Preferably, as shown in fig. 2 to 4, the jet mill 100 for producing the neodymium iron boron alloy includes a third air inlet pipe 21, the nozzle switching mechanism 60 is disposed between the first air inlet pipe 20 and the third air inlet pipe 21, and the nozzle 70 can be connected to the third air inlet pipe 21, so as to fill the first air inlet pipe 20 with gas.

Further, as shown in fig. 2, the nozzle switching mechanism 60 includes: a supporting frame 61 provided on the top of the pulverizing casing 10; the rotating disc 62 is rotatably connected to the supporting frame 61, at least two nozzle 70 mounting holes are formed in the rotating disc 62, and the nozzles 70 are arranged in the nozzle 70 mounting holes; a nozzle holder 63 which is provided in the nozzle 70 mounting hole and can support the nozzle 70; a first elastic member 64 installed between the nozzle holder 63 and the turntable 62; and the driving part 65 is arranged on the third air inlet pipe 21, can push the nozzle 70 to extend into the first air inlet pipe 20, and is connected with the nozzle 70 in a sealing way.

It can be understood that the nozzle 70 is used to connect the first air inlet pipe 20 and the third air inlet pipe 21, the plurality of nozzles 70 are disposed on the rotating plate 62, and the nozzles 70 connecting the first air inlet pipe 20 and the third air inlet pipe 21 are switched by rotating the rotating plate 62.

It should be noted that the nozzle 70 abuts against the nozzle support 63, one end of the nozzle 70 is communicated with the third air inlet pipe 21, and the other end of the nozzle 70 is communicated with the first air inlet pipe 20, it should be mentioned that the nozzle 70 is erected on the nozzle support 63, and by extruding the first elastic member 64, one end of the nozzle 70 extends into the first air inlet pipe 20, and the nozzle 70 is tightly attached to the first air inlet pipe 20, so as to achieve the sealing effect.

Preferably, the driving member 65 is screwed to the third air inlet pipe 21, and by rotating the driving member 65, the driving member 65 can drive the nozzle 70 to extend into the first air inlet pipe 20 and simultaneously press the first elastic member 64.

It can be understood that the driving member 65 is sleeved outside the third air inlet pipe 21 and is in threaded connection with the third air inlet pipe 21, and by rotating the driving member 65, the driving member 65 is in sealed connection with the nozzle 70 and simultaneously extrudes the nozzle 70, and further extrudes the first elastic member 64, so that the nozzle 70 extends into the first air inlet pipe 20.

Preferably, as shown in fig. 7, the nozzle holder 63 includes a slide bar portion 631, a pressing portion 632, and a support portion 633, the slide bar portion 631 is slidable on the turntable 62, the pressing portion 632 abuts against the first elastic member 64, and the support portion 633 supports the nozzle 70.

It can be understood that the nozzle 70 is supported by the pressing portion 632, the supporting portion 633 is supported by the side of the nozzle 70, and the sliding rod portion 631 can slide in a direction perpendicular to the rotating disc 62, so that when the nozzle 70 presses the nozzle support 63, the pressing portion 632 can further press the first elastic member 64, and the nozzle 70 can extend into the first air inlet pipe 20 through the mounting hole of the nozzle 70.

Preferably, as shown in fig. 5 and 6, a sealing assembly 80 is disposed at an end of the feeding pipe 30, the sealing assembly 80 includes a housing 81 disposed outside the first air inlet pipe 20 and a sliding sealing block 82 disposed in the housing 81, a variable-volume inflation cavity 83 is formed between the sliding sealing block 82 and the housing 81, the first air inlet pipe 20 is communicated with the inflation cavity 83, the sliding sealing block 82 has a first sealing inclined surface 821, when the inflation cavity 83 is filled with air, the sliding sealing block 82 moves to the outside of the nozzle 70, and the first sealing inclined surface 821 is closely attached to the outside of the nozzle 70 to perform a sealing function.

It can be understood that, because the air current gushes into the first air inlet pipe 20 through the nozzle 70 at a high speed, the air pressure in the first air inlet pipe 20 is higher, the air flow entering the crushing shell 10 is reduced due to the leakage of the air current through the gap, the crushing in the crushing shell 10 is not facilitated, and the air current leakage is reduced by arranging the sealing assembly 80 so as to improve the sealing performance between the nozzle 70 and the first air inlet pipe 20.

It should be noted that, as shown in fig. 6, the inflation cavity 83 is communicated with the first air inlet pipe 20, when the nozzle 70 fills air into the first air inlet pipe 20, the pressure in the first air inlet pipe 20 increases, so that the inflation cavity 83 increases, the sliding seal block 82 is pushed to move to be attached to the nozzle 70, and as the pressure in the first air inlet pipe 20 increases, the pressure between the sliding seal block 82 and the nozzle 70 increases, and further the pressure between the nozzle 70 and the third air inlet pipe 21 increases, so as to improve the sealing performance, and when the nozzle 70 does not fill air into the first air inlet pipe 20 any more, the sliding seal block 82 can automatically separate from the nozzle 70 under the action of its own gravity.

It should be noted that the first inclined sealing surface 821 is inclined so that the nozzle 70 can closely contact with the first inclined sealing surface 821 to perform a sealing function. Preferably, the first sealing slope 821 has an inclination angle a of 5 ° ≦ a ≦ 20 °. Preferably, the nozzle 70 is provided with a second sealing bevel 71, and the second sealing bevel 71 can cooperate with the first sealing bevel 821 to perform a sealing function. Preferably, the inclination angle of the second sealing inclined plane 71 is b, and a-b is more than or equal to 0 degrees and less than or equal to 5 degrees.

It is understood that the inclination angle of the first sealing slope 821 needs to be considered in combination with the degree of fitting to the nozzle 70 and the height of the first sealing slope 821, and the reduction of the difference between the inclination angle a and the inclination angle b can increase the contact area between the first sealing slope 821 and the second sealing slope 71, thereby improving the sealing performance, while the smaller the inclination angle a, the greater the pressure generated by the second sealing slope 71 and the first sealing slope 821.

Preferably, a flexible sealing layer is disposed on the first sealing slope 821. It will be appreciated that the sealing effect can be enhanced by providing a flexible sealing layer.

In addition, the invention also discloses a using method of the jet mill, which comprises the following steps: s10: when the jet mill is in use, the coarse particles are driven to rotate at a high speed by utilizing high-speed airflow, so that the coarse particles collide with each other, and the effect of crushing the coarse particles is achieved; s20: and in the air flow grinding process, the nozzle is switched by the nozzle switching mechanism. The method can select proper nozzles to operate according to requirements, and is high in efficiency.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An air flow mill suitable for neodymium iron boron alloy for crushing metal coarse particles, comprising: the crushing device comprises a crushing shell, a crushing cavity and a nozzle switching mechanism, wherein the crushing shell is of a cylindrical hollow structure, the crushing cavity is arranged in the crushing shell, a first air inlet pipe is arranged at the top of the crushing shell, the first air inlet pipe is obliquely arranged and is communicated with the crushing shell, a feed pipe is arranged on the first air inlet pipe and is used for pouring metal coarse particles into the first air inlet pipe, a discharge pipe communicated with the crushing cavity is further arranged at the top of the crushing shell, at least two second air inlet pipes are arranged on the side surface of the crushing shell, and the second air inlet pipes are communicated with the crushing cavity;

the jet mill comprises a third air inlet pipe, the nozzle switching mechanism is arranged between the first air inlet pipe and the third air inlet pipe, and the nozzle can be connected to the third air inlet pipe so as to fill air into the first air inlet pipe;

the nozzle switching mechanism includes:

the supporting frame is arranged at the top of the crushing shell;

the rotating disc is rotatably connected to the supporting frame, at least two nozzle mounting holes are formed in the rotating disc, and nozzles are arranged in the nozzle mounting holes;

the nozzle bracket is arranged in the nozzle mounting hole and can support the nozzle;

the first elastic piece is arranged between the nozzle bracket and the turntable;

the driving piece is arranged on the third air inlet pipe, can push the nozzle to extend into the first air inlet pipe and is connected with the nozzle in a sealing way;

the driving piece is in threaded connection with the third air inlet pipe, and can drive the nozzle to extend into the first air inlet pipe and extrude the first elastic piece simultaneously by rotating the driving piece;

the nozzle support comprises a slide rod part, a squeezing part and a supporting part, the slide rod part can slide on the rotary table, the squeezing part abuts against the first elastic piece, and the supporting part supports the nozzle;

the inlet pipe tip is provided with seal assembly, seal assembly including set up in the casing in the first intake pipe outside and set up in sealed piece slides in the casing, sealed piece slides with form the changeable chamber of aerifing of volume between the casing, first intake pipe with aerify the chamber intercommunication, sealed piece that slides has first sealed inclined plane, works as when aerifing the intracavity and being full of gas, sealed piece that slides removes to the nozzle outside, first sealed inclined plane closely laminate in the nozzle outside plays sealed effect.

2. The jet mill suitable for neodymium iron boron alloy of claim 1, wherein the inclination angle of the first sealing inclined plane is a, and a is more than or equal to 5 degrees and less than or equal to 20 degrees.

3. The jet mill suitable for neodymium iron boron alloy of claim 2, wherein the first sealing bevel is provided with a flexible sealing layer.

4. The jet mill suitable for neodymium iron boron alloy of claim 2, wherein a second sealing inclined surface is arranged on the nozzle, and the second sealing inclined surface can be matched with the first sealing inclined surface to play a role in sealing; the inclination angle of the second sealing inclined plane is b, and a-b is more than or equal to 0 degrees and less than or equal to 5 degrees.

5. A method for using a jet mill is characterized by comprising the following steps: s10: use of the jet mill of any one of claims 1 to 4, wherein, in use, the coarse particles are driven to rotate at high speed by the high-speed air flow, so that the coarse particles collide with each other, thereby performing the function of crushing the coarse particles; s20: and in the air flow grinding process, the nozzle is switched by the nozzle switching mechanism.