Pulverizing device for smelting product

Abstract

The embodiment of the utility model discloses a pulverization device for a smelting product, and relates to the technical field of neodymium iron boron permanent magnet production. The method is invented for reducing particles of a smelting product in the process of preparing neodymium iron boron through a sintering method in a safe mode. The device comprises a first high-pressure bin, a second high-pressure bin, a first sealing device and a second sealing device, the front end of the first high-pressure bin is connected with the rear end of the second high-pressure bin, the first sealing device is arranged in the first high-pressure bin and the second high-pressure bin, and the second sealing device is arranged at the rear end of the second high-pressure bin; the front end of the first high-pressure bin and the rear end of the second high-pressure bin are connected with each other, and the front end of the first high-pressure bin and the rear end of the second high-pressure bin are provided with internal threads and external threads which are matched with each other, and the front end of the first high-pressure bin and the rear end of the second high-pressure bin are connected with each other through the internal threads and the external threads which are matched with each other. A first needle valve is arranged on the first high-pressure bin, and a second needle valve is arranged on the second high-pressure bin. The method is suitable for the scene of preparing the neodymium-iron-boron permanent magnet material through the sintering method.

Description

Technical Field

[0001] The invention relates to the technical field of NdFeB permanent magnet production, in particular to a pulverizing device for smelting products. Background Art

[0002] NdFeB permanent magnet material is the third generation of rare earth permanent magnet material after 1:5 type and 2:17 type Sm-Co permanent magnet material. NdFeB permanent magnet material has the highest permanent magnetic properties, so it is called "magnet king". It has currently occupied a dominant position among various permanent magnet materials, especially after 2000, and has grown very rapidly, with an average annual growth rate of about 26.2%.

[0003] In 2016, the global production of NdFeB reached 146,000 tons, of which 89% was produced in China, and among the NdFeB produced, sintered NdFeB accounted for more than 94%. The production process of sintered permanent NdFeB magnets involves more than 10 process flows such as feeding, smelting, hydrogen embrittlement and air flow grinding. The hydrogen embrittlement process refers to the increase in crystal volume after the reaction between hydrogen and the internal crystal particles of the NdFeB smelting product, which causes body stress inside the smelting product and causes the particles of the smelting product to become smaller. However, the hydrogen used in the hydrogen embrittlement process is a flammable and explosive gas, which is prone to danger. Summary of the invention

[0004] In view of this, an embodiment of the present invention provides a pulverizing device for a smelted product, which is convenient for reducing the particles of the smelted product produced in the process of preparing NdFeB by a sintering method in a safe manner.

[0005] In a first aspect, a pulverization device for smelting products provided by an embodiment of the present invention comprises: a first high-pressure bin, a second high-pressure bin, a first sealing device and a second sealing device; the front end of the first high-pressure bin and the rear end of the second high-pressure bin are connected to each other, the first sealing device is arranged inside the first high-pressure bin and the second high-pressure bin, and the second sealing device is arranged at the rear end of the second high-pressure bin; the front end of the first high-pressure bin and the rear end of the second high-pressure bin are connected to each other, including: the front end of the first high-pressure bin and the rear end of the second high-pressure bin are provided with internal and external threads that match each other, and the front end of the first high-pressure bin and the rear end of the second high-pressure bin are connected to each other through the internal and external threads that match each other; a first needle valve is provided on the first high-pressure bin, and a second needle valve is provided on the second high-pressure bin.

[0006] Optionally, the first sealing device includes a piston; the first sealing device is arranged inside the first high-pressure chamber and the second high-pressure chamber, including: the piston is arranged inside the connection between the first high-pressure chamber and the second high-pressure chamber, and is tightly connected to the inner wall of the first high-pressure chamber, and can move axially under the action of force to separate the interiors of the first high-pressure chamber and the second high-pressure chamber, so that the second high-pressure chamber forms a closed space.

[0007] Optionally, the front end of the first high-pressure chamber and the rear end of the second high-pressure chamber are provided with internal and external threads that cooperate with each other, and the front end of the first high-pressure chamber and the rear end of the second high-pressure chamber are connected to each other through the internal and external threads that cooperate with each other, including: the inner surface of the front end of the first high-pressure chamber is provided with a first internal thread, and the outer surface of the rear end of the second high-pressure chamber is provided with a first external thread that cooperates with the first internal thread, and the front end of the first high-pressure chamber and the rear end of the second high-pressure chamber are connected to each other through the first internal thread and the first external thread; or, the outer surface of the front end of the first high-pressure chamber is provided with a second external thread, and the inner surface of the rear end of the second high-pressure chamber is provided with a second internal thread that cooperates with the second external thread; the front end of the first high-pressure chamber and the rear end of the second high-pressure chamber are connected to each other through the second internal thread and the second external thread.

[0008] Optionally, the second sealing device includes an explosion-proof plate and a sealing head; the outer surface of the rear end of the first high-pressure chamber is provided with an external thread, and the sealing head is a hollow cylindrical structure, wherein the first end is an open end and the second end is a closed end, and the inner surface of the open end is provided with an internal thread matching the external thread, and the rear end of the first high-pressure chamber and the open end of the sealing head are sealed and connected through the internal thread and the external thread; an opening is provided on the cylinder wall of the sealing head, and the explosion-proof plate is arranged on the end face of the rear end of the first high-pressure chamber, and is sealed and connected with the inner surface of the sealing head in the circumferential direction, so that the first high-pressure chamber forms a closed space.

[0009] The pulverization device of the smelting product provided in the embodiment of the present invention comprises a first high-pressure chamber, a second high-pressure chamber, a first sealing device and a second sealing device; the front end of the first high-pressure chamber and the rear end of the second high-pressure chamber are connected to each other, the first sealing device is arranged inside the first high-pressure chamber and the second high-pressure chamber, and the second sealing device is arranged at the rear end of the second high-pressure chamber; the front end of the first high-pressure chamber and the rear end of the second high-pressure chamber are connected to each other, including: the front end of the first high-pressure chamber and the rear end of the second high-pressure chamber are provided with internal and external threads that match each other, and the front end of the first high-pressure chamber and the rear end of the second high-pressure chamber are connected to each other through the internal and external threads that match each other; the first high-pressure chamber is provided with a first needle valve, and the second high-pressure chamber is provided with a second needle valve. In this way, it is convenient to reduce the particles of the smelting product produced in the process of preparing NdFeB by sintering in a safe way. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0011] Figure 1 It is a schematic diagram of the structure of an embodiment of a pulverizing device for smelting products of the present invention;

[0012] Figure 2 The figure is a schematic flow chart of a method for pulverizing a smelting product according to an embodiment of the present invention. DETAILED DESCRIPTION

[0013] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0014] It should be clear that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] Embodiment 1

[0016] Figure 1 FIG. 1 is a schematic diagram of an embodiment of a pulverizing device for smelting products according to the present invention. Figure 1As shown, the device includes: a first high-pressure chamber 1, a second high-pressure chamber 2, a first sealing device 3 and a second sealing device 4; the front end of the first high-pressure chamber 1 and the rear end of the second high-pressure chamber 2 are connected to each other, the first sealing device 3 is arranged inside the first high-pressure chamber 1 and the second high-pressure chamber 2, and the second sealing device 4 is arranged at the rear end of the second high-pressure chamber 2; the front end of the first high-pressure chamber 1 and the rear end of the second high-pressure chamber 2 are connected to each other, including: the front end of the first high-pressure chamber 1 and the rear end of the second high-pressure chamber 2 are provided with internal and external threads that match each other, and the front end of the first high-pressure chamber 1 and the rear end of the second high-pressure chamber 2 are connected to each other through the internal and external threads that match each other; the first high-pressure chamber 1 is provided with a first needle valve 5, and the second high-pressure chamber 2 is provided with a second needle valve 6.

[0017] Specifically, the first high-pressure chamber and the second high-pressure chamber may be made of 304 stainless steel, or other alloys that can withstand high pressure. The explosion-proof disc may be made of 304 stainless steel, or other materials with a certain shear strength.

[0018] The pulverization device of the smelting product provided in the embodiment of the present invention comprises: a first high-pressure chamber, a second high-pressure chamber, a first sealing device and a second sealing device; the front end of the first high-pressure chamber and the rear end of the second high-pressure chamber are connected to each other, the first sealing device is arranged inside the first high-pressure chamber and the second high-pressure chamber, and the second sealing device is arranged at the rear end of the second high-pressure chamber; the front end of the first high-pressure chamber and the rear end of the second high-pressure chamber are connected to each other, including: the front end of the first high-pressure chamber and the rear end of the second high-pressure chamber are provided with internal and external threads that match each other, and the front end of the first high-pressure chamber and the rear end of the second high-pressure chamber are connected to each other through the internal and external threads that match each other; the first high-pressure chamber is provided with a first needle valve, and the second high-pressure chamber is provided with a second needle valve. In this way, it is convenient to reduce the particles of the smelting product produced in the process of preparing NdFeB by sintering in a safe way.

[0019] In some embodiments, the first sealing device 3 includes a piston; the first sealing device 3 is arranged inside the first high-pressure chamber 1 and the second high-pressure chamber 2, including: the piston is arranged inside the connection between the first high-pressure chamber 1 and the second high-pressure chamber 2, and is tightly connected to the inner wall of the first high-pressure chamber 1, and can move axially under the action of force to separate the interior of the first high-pressure chamber 1 and the second high-pressure chamber 2, so that the second high-pressure chamber 2 forms a closed space.

[0020] In some embodiments, the front end of the first high-pressure chamber and the rear end of the second high-pressure chamber are provided with internal and external threads that cooperate with each other, and the front end of the first high-pressure chamber and the rear end of the second high-pressure chamber are connected to each other through the internal and external threads that cooperate with each other, including: the inner surface of the front end of the first high-pressure chamber is provided with a first internal thread, and the outer surface of the rear end of the second high-pressure chamber is provided with a first external thread that cooperates with the first internal thread; the front end of the first high-pressure chamber and the rear end of the second high-pressure chamber are connected to each other through the cooperation of the first internal thread and the first external thread; or, the outer surface of the front end of the first high-pressure chamber is provided with a second external thread, and the inner surface of the rear end of the second high-pressure chamber is provided with a second internal thread that cooperates with the second external thread; the front end of the first high-pressure chamber and the rear end of the second high-pressure chamber are connected to each other through the cooperation of the second internal thread and the second external thread.

[0021] In some embodiments, the second sealing device 4 includes an explosion-proof disc 41 and a sealing head 42; the outer surface of the rear end of the first high-pressure chamber 1 is provided with an external thread, and the sealing head 42 is a hollow cylindrical structure, the first end of which is an open end, and the second end is a closed end, the inner surface of the open end is provided with an internal thread matching the external thread, and the rear end of the first high-pressure chamber and the open end of the sealing head are sealed and connected through the internal thread and the external thread; an opening is provided on the cylinder wall of the sealing head 42, and the explosion-proof disc 41 is arranged on the end face of the rear end of the first high-pressure chamber 1, and is tightly connected with the inner surface of the sealing head 42 in the circumferential direction, so that the first high-pressure chamber 1 forms a closed space.

[0022] It can be understood that when the first high-pressure chamber 1 is filled with high-pressure gas until the explosion-proof plate 41 is broken, the rear end of the first high-pressure chamber 1 is opened, and the smelting product is quickly ejected from the opening.

[0023] Embodiment 2

[0024] Corresponding to the pulverizing device for the smelted product provided in the above-mentioned embodiment, see Figure 2 As shown, Figure 2 The present invention is a schematic flow chart of a method for pulverizing a smelting product according to an embodiment of the present invention, comprising the following steps:

[0025] S1. Separate the first high-pressure chamber from the second high-pressure chamber by a first sealing device.

[0026] Specifically, the first sealing device may be a piston. The material of the first high-pressure chamber and the second high-pressure chamber may be 304 stainless steel, and other alloys that can withstand higher pressures may also be used as the material of the first high-pressure chamber and the second high-pressure chamber. It is understood that the size of the high-pressure chamber may be determined according to the processing volume of a single material, and the material includes smelting products and other materials.

[0027] In some embodiments, the first sealing device is a piston; before separating the first high-pressure chamber from the second high-pressure chamber by the first sealing device, the method further includes: connecting the front end of the first high-pressure chamber and the rear end of the second high-pressure chamber. Specifically, the front end of the first high-pressure chamber and the rear end of the second high-pressure chamber can be connected by threaded connection. The separation of the first high-pressure chamber and the second high-pressure chamber by the first sealing device includes: installing a piston to the connection between the first high-pressure chamber and the second high-pressure chamber to separate the interior of the first high-pressure chamber from the interior of the second high-pressure chamber; the sealing of the first high-pressure chamber by the second sealing device includes: installing the second sealing device to the rear end of the first high-pressure chamber to seal the first high-pressure chamber. In order to separate the smelting product and other materials in the preset material, the first preset amount of the smelting product is put into the interior of the first high-pressure chamber, including: putting the preset material mixed with the first preset amount of the smelting product into the interior of the first high-pressure chamber, wherein the preset material includes the smelting product and other materials.

[0028] It can be understood that the first sealing device is installed at the connection between the first high-pressure chamber and the second high-pressure chamber, that is, installed at the front end of the first high-pressure chamber and the rear end of the second high-pressure chamber to separate the first high-pressure chamber from the second high-pressure chamber. The front end of the second high-pressure chamber can be in a sealed state, and when the sealing device is used to separate the first high-pressure chamber and the second high-pressure chamber, the front end of the first high-pressure chamber and the rear end of the second high-pressure chamber are also sealed.

[0029] S2. Adding a first preset amount of smelting product into the first high-pressure chamber, and sealing the first high-pressure chamber by a second sealing device; wherein the second sealing device includes a flameproof disc and a sealing head.

[0030] Specifically, the smelting product can be a smelting product in the process of preparing NdFeB permanent magnet materials by sintering method, and the material of the explosion-proof plate can be 304 stainless steel, or other materials with certain shear strength can be used as the material of the explosion-proof plate. When the first high-pressure chamber is sealed by the second sealing device, the second sealing device is installed to the rear end of the first high-pressure chamber to seal the first high-pressure chamber. It can be understood that the explosion-proof plate can be installed first and then the sealing head can be tightened. The explosion-proof plate is first installed on the end face of the rear end of the first high-pressure chamber, and then the sealing head is tightened. The explosion-proof plate is tightly connected with the inner surface of the sealing head along the circumferential direction. The explosion-proof plate is blocked at the rear end of the first high-pressure chamber by the cooperation of the explosion-proof plate and the sealing head.

[0031] S3. Filling a second preset amount of high-pressure gas into the first high-pressure chamber so that the explosion-proof disc is subjected to a preset pressure; wherein the preset pressure is less than the maximum pressure that the explosion-proof disc can withstand.

[0032] It is understandable that high-pressure gas can be filled into the interior of the first high-pressure chamber through the first needle valve, and a second preset amount of high-pressure gas can be filled into the interior of the first high-pressure chamber, so that the inside and outside of the internal smelting product of the first high-pressure chamber can be filled with high-pressure gas.

[0033] In some embodiments, the method further includes: determining the maximum pressure that the explosion-proof disc can withstand based on the thickness and shear strength of the explosion-proof disc.

[0034] It can be understood that the pressure p that the explosion-proof disc withstands when the second preset amount of high-pressure gas is filled needs to be less than the maximum pressure that the explosion-proof disc can withstand, that is, Where r is the inner diameter of the first high-pressure chamber, d is the thickness of the explosion-proof disk, The shear strength of the explosion-proof disc material is determined by the material. Specifically, when the first high-pressure chamber is charged with high-pressure gas for the first time, the pressure applied to the explosion-proof disc is generally half of the shear strength that the explosion-proof disc can withstand.

[0035] In some embodiments, the high pressure gas includes at least one of the following: air, nitrogen, and carbon dioxide.

[0036] S4. Filling a third preset amount of high-pressure gas into the interior of the second high-pressure chamber; wherein the third preset amount is equal to the volume of the second high-pressure chamber.

[0037] Specifically, the second high-pressure chamber may be filled with high-pressure gas through the second needle valve, and the second high-pressure chamber may be filled with high-pressure gas equal to that of the second high-pressure chamber.

[0038] S5. Continue to charge the first high-pressure chamber with high-pressure gas until the explosion-proof plate breaks, so that the high-pressure gas in the second high-pressure chamber pushes the gas and smelting products in the first high-pressure chamber to be ejected quickly, and the smelting products are pulverized during the ejection process.

[0039] It is understandable that, in the process of preparing permanent magnets by sintering, the sintered product can be broken and powdered based on high-speed gas unloading, and the sintered product is the smelting product. The first high-pressure chamber is continuously charged with high-pressure gas, so that the explosion-proof disc of the first high-pressure chamber is shear-damaged. When the explosion-proof disc is broken, the high-pressure gas in the second high-pressure chamber can push the high-pressure gas and the smelting product in the first high-pressure chamber to be ejected quickly, and the smelting product is powdered during the ejection process.

[0040] The pulverization method of the smelting product provided in the embodiment of the present invention can separate the first high-pressure chamber and the second high-pressure chamber by a first sealing device; put a first preset amount of smelting product into the interior of the first high-pressure chamber, and seal the first high-pressure chamber by a second sealing device; wherein the second sealing device includes a flameproof disc and a sealing head; fill a second preset amount of high-pressure gas into the interior of the first high-pressure chamber so that the flameproof disc can withstand a preset pressure; wherein the preset pressure is less than the maximum pressure that the flameproof disc can withstand; fill a third preset amount of high-pressure gas into the interior of the second high-pressure chamber; wherein the third preset amount is equal to the volume of the second high-pressure chamber; continue to fill the first high-pressure chamber with high-pressure gas until the flameproof disc breaks, so that the high-pressure gas in the second high-pressure chamber pushes the gas and smelting product of the first high-pressure chamber to be ejected quickly, and the smelting product is pulverized during the ejection process. In this way, it is convenient to reduce the particles of the smelting product produced in the process of preparing NdFeB by sintering in a safe way.

[0041] In some embodiments, the high-pressure gas in the second high-pressure chamber pushes the gas and the smelted product in the first high-pressure chamber to be ejected quickly, and the smelted product is powdered during the ejection process, including:

[0042] The high-pressure gas in the second high-pressure chamber pushes the gas in the first high-pressure chamber and the preset material to be ejected quickly, and the smelted product is pulverized during the ejection process, so that the smelted product and the other materials are separated, and the separated smelted product is recovered; the gas pressure setting of the gas in the first high-pressure chamber should be sufficient to pulverize only the smelted product when pushing the preset material to be ejected, and the other materials will not be pulverized.

[0043] It should be noted that in this article, relational terms such as first and second are only used to refer to

[0044] One entity or operation is distinguished from another entity or operation without necessarily requiring or implying any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0045] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0046] For the convenience of description, if it involves a system, server, etc., it may be described separately by dividing the functions into various units / modules. Of course, when implementing the present invention, the functions of each unit / module can be implemented in the same or multiple software and / or hardware.

[0047] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium, and when the program is executed, it can include the processes of the embodiments of the above-mentioned methods. The storage medium can be a disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM), etc.

[0048] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A pulverizing device for smelting products, characterized in that: include: A first high-pressure chamber, a second high-pressure chamber, a first sealing device and a second sealing device; the front end of the first high-pressure chamber and the rear end of the second high-pressure chamber are connected to each other, the first sealing device is arranged inside the first high-pressure chamber and the second high-pressure chamber, and the second sealing device is arranged at the rear end of the second high-pressure chamber; the front end of the first high-pressure chamber and the rear end of the second high-pressure chamber are connected to each other, including: the front end of the first high-pressure chamber and the rear end of the second high-pressure chamber are provided with internal and external threads that match each other, and the front end of the first high-pressure chamber and the rear end of the second high-pressure chamber are connected to each other through the internal and external threads that match each other; a first needle valve is provided on the first high-pressure chamber, and a second needle valve is provided on the second high-pressure chamber.

2. The pulverizing device for smelting products according to claim 1, characterized in that: The first sealing device includes a piston; The first sealing device is arranged inside the first high-pressure chamber and the second high-pressure chamber, and includes: the piston is arranged inside the connection between the first high-pressure chamber and the second high-pressure chamber, and is tightly connected to the inner wall of the first high-pressure chamber, and can move axially under the action force to separate the interior of the first high-pressure chamber and the second high-pressure chamber, so that the second high-pressure chamber forms a closed space.

3. The pulverizing device for smelting products according to claim 1, characterized in that: The front end of the first high-pressure chamber and the rear end of the second high-pressure chamber are provided with internal and external threads that match each other, and the front end of the first high-pressure chamber and the rear end of the second high-pressure chamber are connected to each other through the internal and external threads that match each other, including: The inner surface of the front end of the first high-pressure chamber is provided with a first internal thread, and the outer surface of the rear end of the second high-pressure chamber is provided with a first external thread that cooperates with the first internal thread, and the front end of the first high-pressure chamber and the rear end of the second high-pressure chamber are connected to each other through the first internal thread and the first external thread; or, the outer surface of the front end of the first high-pressure chamber is provided with a second external thread, and the inner surface of the rear end of the second high-pressure chamber is provided with a second internal thread that cooperates with the second external thread; the front end of the first high-pressure chamber and the rear end of the second high-pressure chamber are connected to each other through the second internal thread and the second external thread.

4. The pulverizing device for smelting products according to claim 1, characterized in that: The second sealing device comprises a flameproof disc and a sealing head; The outer surface of the rear end of the first high-pressure chamber is provided with an external thread, the sealing head is a hollow cylindrical structure, the first end of which is an open end, the second end is a closed end, the inner surface of the open end is provided with an internal thread that matches the external thread, and the rear end of the first high-pressure chamber and the open end of the sealing head are sealed and connected through the matching of the internal thread and the external thread; An opening is provided on the cylinder wall of the sealing head, and the explosion-proof plate is arranged on the end face of the rear end of the first high-pressure chamber and is tightly connected with the inner surface of the sealing head in the circumferential direction, so that the first high-pressure chamber forms a closed space.

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