CN114823109A - Preparation method of sintered neodymium-iron-boron permanent magnet material - Google Patents
Preparation method of sintered neodymium-iron-boron permanent magnet material Download PDFInfo
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- CN114823109A CN114823109A CN202210231093.3A CN202210231093A CN114823109A CN 114823109 A CN114823109 A CN 114823109A CN 202210231093 A CN202210231093 A CN 202210231093A CN 114823109 A CN114823109 A CN 114823109A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
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Abstract
The invention belongs to the field of rare earth permanent magnet materials, and particularly relates to a preparation method of a sintered neodymium iron boron permanent magnet material, which comprises a vacuum refining furnace and a valve body; when power failure or fault occurs, the vacuum refining furnace is cooled, the electromagnet is electrified to generate magnetic force, the armature is sucked up, the sealing seat blocks the tap water interface, the cooling water interface is opened, cooling water is added into the valve body through the water pump and is added into a cooling pipeline in the vacuum refining furnace, and the temperature is reduced; when power is off or a fault occurs, the electromagnet is powered off, so that the armature iron slides downwards under the action of gravity to drive the sealing seat to slide downwards, the cooling water interface is blocked, the tap water interface is opened, tap water enters the valve body through the tap water interface, and is added into a cooling pipeline in the vacuum refining furnace to be cooled; the automatic feeding of tap water into the cooling system is realized, continuous cooling work is carried out on the smelting furnace, and the waste of raw materials is reduced.
Description
Technical Field
The invention belongs to the field of rare earth permanent magnet materials, and particularly relates to a preparation method of a sintered neodymium iron boron permanent magnet material.
Background
The main components of the sintered Nd-Fe-B permanent magnet material are rare earth elements of Nd, Fe and B; the sintered Nd-Fe-B permanent magnetic material has excellent magnetic performance, good dynamic recovery characteristic and high cost performance, and is widely applied to the fields of electronics, electric power machinery, medical instruments, toys, packaging, hardware machinery, aerospace and the like.
A chinese patent with publication number CN103559972A discloses a preparation method of a novel sintered nd-fe-b permanent magnet material. In the process of preparing the sintered neodymium iron boron, a small amount of Cu-Zn alloy nano powder and neodymium iron boron powder based on a 2:14:1 phase are uniformly mixed, and then the product is obtained through magnetic field orientation press forming, vacuum sintering and tempering heat treatment. The copper-zinc phase in the novel sintered neodymium-iron-boron product tissue structure completely replaces a crystal boundary Nd-rich phase in a traditional product, the copper-zinc phase plays roles of magnetic isolation and sintering assistance of the Nd-rich phase, and comprehensive performances such as high coercivity, high corrosion resistance, high toughness and the like can be obtained simultaneously.
In the process of smelting raw materials, workers are required to pay close attention to the flow and temperature of each path of cooling water in a smelting furnace; when the cooling water can not be normally supplied due to power failure or other reasons, workers are required to timely send tap water into a cooling system; if the tap water is not fed into the cooling system in time, the temperature in the smelting furnace can be continuously raised, so that the smelting failure of the raw materials is easily caused, and the waste and unnecessary loss of the raw materials are caused.
Therefore, the invention provides a preparation method of a sintered neodymium-iron-boron permanent magnet material.
Disclosure of Invention
To remedy the deficiencies of the prior art, at least one of the technical problems set forth in the background is addressed.
The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to a preparation method of a sintered neodymium-iron-boron permanent magnet material, which comprises the following steps:
s1: polishing the iron bar by using a polishing machine, and performing alkaline segmentation on the iron bar by using a cutting machine;
s2: adding rare earth elements of neodymium, iron rods and refined boron into a smelting device, carrying out vacuum-pumping smelting, stopping heating until the iron rods are completely melted into the molten alloy, adding cooling water into a cooling pipeline in a vacuum refining furnace through a water pump, cooling, and when power failure or fault occurs, cutting off power through an electromagnet in a valve body, adding tap water into the cooling pipeline in the vacuum refining furnace, and cooling; after the temperature is reduced to below 80 ℃, taking out the cast ingot;
s3: putting the cast ingot into a crushing device, and crushing to obtain alloy fine powder;
s4: weighing the alloy fine powder, adding the alloy fine powder into a forming die, closing the forming die by a press, and pressing and forming the alloy fine powder;
s5: polishing and cutting the surface of the molded sintered neodymium-iron-boron permanent magnet;
s6: and electroplating the shaped sintered neodymium iron boron permanent magnet to obtain a finished sintered neodymium iron boron permanent magnet.
Preferably, the smelting device in S2 comprises a vacuum refining furnace and a valve body; a cooling pipeline is arranged inside the outer wall of the vacuum refining furnace, a valve body is fixedly connected to one side of the outer wall of the vacuum refining furnace, a bottom inner cavity of the valve body is communicated with a bottom interface of the cooling pipeline, a tap water interface and a cooling water interface are fixedly connected to one side, away from the vacuum refining furnace, of the valve body, the cooling water interface is communicated with a top interface of the cooling pipeline through a water pump, an electromagnet is arranged in a top inner cavity of the valve body, a cross-shaped guide rod is fixedly connected to the middle of the bottom inner cavity of the valve body, an armature is slidably mounted on the outer ring of the cross-shaped guide rod, one side, away from the vacuum refining furnace, of the armature is fixedly connected with a sealing seat, and the sealing seat is slidably connected with the inner wall of the valve body; when the vacuum refining furnace works, when power is not cut off or a fault occurs, the vacuum refining furnace is cooled, the electromagnet is electrified to generate magnetic force, the armature is sucked up, the sealing seat blocks a tap water interface, a cooling water interface is opened, cooling water is added into the valve body through the water pump and is added into a cooling pipeline in the vacuum refining furnace for cooling; when power is off or a fault occurs, the electromagnet is powered off, so that the armature iron slides downwards under the action of gravity to drive the sealing seat to slide downwards, the cooling water interface is blocked, the tap water interface is opened, tap water enters the valve body through the tap water interface, and is added into a cooling pipeline in the vacuum refining furnace to be cooled; the automatic feeding of tap water into the cooling system is realized, continuous cooling work is carried out on the smelting furnace, and the waste of raw materials is reduced.
Preferably, the top surface and the bottom surface of the armature are fixedly connected with telescopic sleeves, one ends of the telescopic sleeves, far away from the armature, are fixedly connected with the inner wall of the valve body, and the telescopic sleeves are sleeved on the outer ring of the cross guide rod; during operation, the cross guide rod is sealed through the telescopic sleeve, so that the problem that the armature slides difficultly due to the fact that the cross guide rod is corroded when being soaked in water is avoided, and the sliding smoothness of the armature is improved.
Preferably, the middle of the bottom surface of the armature is provided with a sliding groove, an oil bag is arranged inside the sliding groove, an inner ring pipeline of the oil bag is communicated with a middle sliding hole of the armature, and the bottom of the sliding groove is provided with a push plate in a sliding manner; during operation, when armature falls down, the push plate contacts the bottom surface of the valve body, so that the push plate slides into the sliding groove, the oil bag is compressed, lubricating oil in the oil bag is sprayed to the outer wall of the cross-shaped guide rod, the cross-shaped guide rod is lubricated, and the sliding smoothness of the armature is further improved.
Preferably, an annular cavity is formed in the armature, an annular plate is slidably mounted in the annular cavity, an annular air bag is fixedly connected between the bottom surface of the annular plate and the bottom surface of the annular cavity, a plurality of springs are fixedly connected between the top surface of the annular plate and the top surface of the annular cavity, a sealing air bag is arranged in the middle of one surface, away from the vacuum refining furnace, of the sealing seat, and the sealing air bag is communicated with the annular air bag through an air pipe; during operation, armature during upwards sliding for the top surface of crown plate and the inner chamber top surface contact extrusion of valve body, make the crown plate lapse, promote the compression of annular gasbag, impress the air in the annular gasbag in the sealed gasbag, make sealed gasbag inflation, further block up the running water interface, thereby further seal the running water interface, reduced in the running water gets into the cooling water, reduced the incrustation scale impurity in the cooling water, improved cooling tube's clean degree then.
Preferably, the bottom of the cooling water interface is connected with a drainage pipe, the middle part of the drainage pipe is fixedly connected with a second spring, the other end of the second spring is fixedly connected with a rubber block, the outer wall of the rubber block is in sliding fit with the inner wall of the drainage pipe, the bottom of one surface of the sealing seat, which is far away from the vacuum refining furnace, is fixedly connected with a first magnet, the inside of the rubber block is provided with a second magnet, and the surface, which is close to the first magnet, of the first magnet and the surface, which is close to the second magnet, are mutually attracted; when the device works, when power is off or a fault occurs, the sealing seat slides downwards to block the cooling water interface, the tap water interface is opened, the first magnet is close to the second magnet, the cooling water interface of the rubber block box is close to the first magnet, and a gap between the drainage pipe and the rubber block is opened; running water after the heat exchange carries out in the cooling tube gets into in the bleeder line, discharges from the space between bleeder line and the rubber piece, gets into the cistern and stores, saves the running water, and the staff of being convenient for carries out the reutilization to the running water, has improved the utilization ratio of water resource.
Preferably, the bottom of the tap water port is bolted with a filtering shell, the top of the filtering shell is communicated with the tap water port, one side of the filtering shell, which is far away from the valve body, is slidably provided with a filter element, one side of the filtering shell, which is close to the valve body, is slidably provided with a third magnet, one side of the third magnet, which is close to the second magnet, is mutually attracted, a pull rope is fixedly connected between the middle part of the third magnet and the bottom of the filter element, the pull rope penetrates through a guide hole in the bottom of the filtering shell, and a plurality of third springs are fixedly connected between one side of the outer ring of the second magnet, which is close to the valve body, and the inner wall of the valve body; the during operation, when having a power failure or breaking down, the seal receptacle lapse, make a magnet keep away from with No. three magnets mutually, make No. three magnets under the promotion of No. three springs, No. three magnets cunning to one side of filter core, loosen the stay cord, the filter core is under the effect of buoyancy, in the slip-in running water interface, filter the running water, get rid of the impurity incrustation scale in the running water effectively, thereby the impurity incrustation scale that has reduced the running water deposits on the cooling tube inner wall, the smoothness nature of rivers in the cooling tube has then been improved.
Preferably, a rubber pad is fixedly connected to the top surface of the filter element, the filter element and the rubber pad have buoyancy, and the outer ring of the bottom surface of the rubber pad is in sliding fit with the opening at the top of the filtering shell; during operation, the rubber pad is sealed the running water interface with the inner wall top surface contact back of running water interface, has improved the comprehensive of running water through the filter core, simultaneously, rubber pad and the open-top sliding fit who filters the casing for in the filter core gets into the filtration casing, seal the filtration casing, reduced the running water and got into the volume in the filtration casing, improved the clean degree of filter core.
Preferably, a plurality of groups of arc-shaped elastic sheets are fixedly connected to the inner wall of the filtering shell, a scraper is fixedly connected to the middle of each group of arc-shaped elastic sheets, the scraper is in sliding fit with the outer wall of the filter element, a plurality of sliding balls are fixedly connected to one side, close to the inner wall of the filtering shell, of the scraper, and the outer wall of each sliding ball is in sliding fit with the inner wall of the filtering shell; during operation, the filter core gets into and filters the casing when inside, and the scraper blade rubs the outer wall of filter core, filters down the impurity on filter core surface, and the outer wall that the filter core was scraped to the scraper blade is for the arc shell fragment takes place to warp, makes the scraper blade take place to rotate, and the smooth ball slides with filtering shells inner wall, thereby has improved the whole clean degree of filter core, has improved the filtration efficiency to the running water then.
The invention has the following beneficial effects:
1. the invention relates to a preparation method of a sintered neodymium iron boron permanent magnet material, which is characterized in that a vacuum refining furnace and a valve body are arranged; when power failure or fault occurs, the vacuum refining furnace is cooled, the electromagnet is electrified to generate magnetic force, the armature is sucked up, the sealing seat blocks the tap water interface, the cooling water interface is opened, cooling water is added into the valve body through the water pump and is added into a cooling pipeline in the vacuum refining furnace, and the temperature is reduced; when power is off or a fault occurs, the electromagnet is powered off, so that the armature iron slides downwards under the action of gravity to drive the sealing seat to slide downwards, the cooling water interface is blocked, the tap water interface is opened, tap water enters the valve body through the tap water interface, and is added into a cooling pipeline in the vacuum refining furnace to be cooled; the automatic feeding of tap water into the cooling system is realized, continuous cooling work is carried out on the smelting furnace, and the waste of raw materials is reduced.
2. The preparation method of the sintered neodymium iron boron permanent magnet material comprises the steps of arranging a drain pipe, a rubber block, a first magnet and a second magnet; when power failure or failure occurs, the sealing seat slides downwards to block the cooling water interface, the tap water interface is opened, the first magnet is close to the second magnet, the cooling water interface of the rubber block box is close, and a gap between the drainage pipe and the rubber block is opened; the running water receives the stopping of seal receptacle, gets into in the bleeder line, discharges from the space between bleeder line and the rubber piece, gets into the cistern and stores, and the staff of being convenient for carries out the reutilization to the running water, has improved the utilization ratio of water resource.
Drawings
The invention will be further explained with reference to the drawings.
FIG. 1 is a perspective view of a first embodiment of the present invention;
FIG. 2 is a front view of a first embodiment of the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
FIG. 4 is an enlarged view of a portion of FIG. 3 at B;
FIG. 5 is an enlarged view of a portion of FIG. 3 at C;
FIG. 6 is an enlarged view of a portion of FIG. 3 at D;
FIG. 7 is an enlarged view of a portion E of FIG. 6;
FIG. 8 is a bottom cross-sectional view of a filter cartridge according to a second embodiment of the present invention;
FIG. 9 is a flow chart of the preparation of the present invention;
in the figure: 1. a vacuum refining furnace; 2. a cooling duct; 3. a telescopic sleeve; 4. a tap water interface; 5. a cooling water interface; 6. a valve body; 7. an electromagnet; 8. an armature; 9. a sealing seat; 10. a cross-shaped guide rod; 11. a chute; 12. an oil pocket; 13. an annular cavity; 14. pushing the plate; 15. a ring plate; 16. an annular air bag; 17. a first spring; 18. sealing the air bag; 19. a bleeder tube; 21. a second spring; 22. a rubber block; 23. a magnet number one; 24. a magnet number two; 25. a filter housing; 26. a filter element; 27. a magnet number three; 28. pulling a rope; 29. a third spring; 30. a rubber pad; 31. an arc-shaped elastic sheet; 32. a squeegee; 33. a sliding ball; 34. a ring groove; 35. a cotton strip ring plate.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Example one
As shown in fig. 9, the preparation method of the sintered nd-fe-b permanent magnetic material according to the embodiment of the present invention includes the following steps:
s1: polishing the iron bar by using a polishing machine, and performing alkaline segmentation on the iron bar by using a cutting machine;
s2: adding rare earth elements of neodymium, an iron rod and refined boron into a smelting device, carrying out vacuum smelting, stopping heating until the iron rod is completely melted into the alloy liquid, adding cooling water into a cooling pipeline 2 in a vacuum refining furnace 1 through a water pump, cooling, and when power is cut off or a fault occurs, adding tap water into the cooling pipeline 2 in the vacuum refining furnace 1 through the power failure of an electromagnet 7 in a valve body 6, and cooling; after the temperature is reduced to below 80 ℃, taking out the cast ingot;
s3: putting the cast ingot into a crushing device, and crushing to obtain alloy fine powder;
s4: weighing the alloy fine powder, adding the alloy fine powder into a forming die, closing the forming die by a press, and pressing and forming the alloy fine powder;
s5: polishing and cutting the surface of the molded sintered neodymium-iron-boron permanent magnet;
s6: and electroplating the shaped sintered neodymium iron boron permanent magnet to obtain a finished sintered neodymium iron boron permanent magnet.
As shown in fig. 1 to 3, the melting device in S2 includes a vacuum refining furnace 1 and a valve body 6; a cooling pipeline 2 is arranged inside the outer wall of the vacuum refining furnace 1, a valve body 6 is fixedly connected to one side of the outer wall of the vacuum refining furnace 1, a bottom inner cavity of the valve body 6 is communicated with a bottom interface of the cooling pipeline 2, a tap water interface 4 and a cooling water interface 5 are fixedly connected to one side, far away from the vacuum refining furnace 1, of the valve body 6, the cooling water interface 5 is communicated with a top interface of the cooling pipeline 2 through a water pump, an electromagnet 7 is arranged in the top inner cavity of the valve body 6, a cross guide rod 10 is fixedly connected to the middle part of the bottom inner cavity of the valve body 6, an armature 8 is slidably mounted on the outer ring of the cross guide rod 10, one side, far away from the vacuum refining furnace 1, of the armature 8 is fixedly connected with a seal seat 9, and the seal seat 9 is slidably connected with the inner wall of the valve body 6; when the vacuum refining furnace 1 works, when power is not cut off or a fault occurs, the vacuum refining furnace 1 is cooled, the electromagnet 7 is electrified to generate magnetic force, the armature 8 is sucked up, the sealing seat 9 blocks the tap water interface 4, the cooling water interface 5 is opened, cooling water is added into the valve body 6 through the water pump and is added into the cooling pipeline 2 in the vacuum refining furnace 1 for cooling; when power failure or failure occurs, the electromagnet 7 is powered off, so that the armature 8 slides downwards under the action of gravity to drive the sealing seat 9 to slide downwards, the cooling water interface 5 is blocked, the tap water interface 4 is opened, tap water enters the valve body 6 through the tap water interface 4, and is added into the cooling pipeline 2 in the vacuum refining furnace 1 to be cooled; the automatic feeding of tap water into the cooling system is realized, continuous cooling work is carried out on the smelting furnace, and the waste of raw materials is reduced.
As shown in fig. 3 to 4, the top surface and the bottom surface of the armature 8 are both fixedly connected with a telescopic tube 3, one end of the telescopic tube 3, which is far away from the armature 8, is fixedly connected with the inner wall of the valve body 6, and the telescopic tube 3 is sleeved on the outer ring of the cross guide rod 10; when the telescopic sleeve type armature iron works, the cross guide rod 10 is sealed through the arranged telescopic sleeve 3, so that the problem that the armature iron 8 is difficult to slide due to the fact that the cross guide rod 10 is corroded when being soaked in water is avoided, and the sliding smoothness of the armature iron 8 is improved.
A sliding groove 11 is formed in the middle of the bottom surface of the armature 8, an oil bag 12 is arranged inside the sliding groove 11, an inner ring pipeline of the oil bag 12 is communicated with a middle sliding hole of the armature 8, and a push plate 14 is slidably mounted at the bottom of the sliding groove 11; during operation, when the armature 8 falls, the push plate 14 contacts the bottom surface of the valve body 6, so that the push plate 14 slides into the sliding groove 11, the oil bag 12 is compressed, lubricating oil in the oil bag 12 is sprayed to the outer wall of the cross guide rod 10, the cross guide rod 10 is lubricated, and the sliding fluency of the armature 8 is further improved.
An annular cavity 13 is formed in the armature 8, an annular plate 15 is slidably mounted in the annular cavity 13, an annular air bag 16 is fixedly connected between the bottom surface of the annular plate 15 and the bottom surface of the annular cavity 13, a plurality of springs 17 are fixedly connected between the top surface of the annular plate 15 and the top surface of the annular cavity 13, a sealing air bag 18 is arranged in the middle of one surface, away from the vacuum refining furnace 1, of the sealing seat 9, and the sealing air bag 18 is communicated with the annular air bag 16 through an air pipe; during operation, when armature 8 upwards slided, make the top surface of crown plate 15 and the inner chamber top surface contact extrusion of valve body 6, make crown plate 15 lapse, promote the compression of annular gasbag 16, impress the air in the annular gasbag 16 in sealed gasbag 18, make sealed gasbag 18 inflation, further block up running water interface 4, thereby further seal running water interface 4, in having reduced the running water and having got into the cooling water, incrustation scale impurity in the cooling water has been reduced, the clean degree of cooling tube 2 has then been improved.
As shown in fig. 3 and 5, a drain pipe 19 is connected to the bottom of the cooling water interface 5, a second spring 21 is fixedly connected to the middle of the drain pipe 19, a rubber block 22 is fixedly connected to the other end of the second spring 21, the outer wall of the rubber block 22 is in sliding fit with the inner wall of the drain pipe 19, a first magnet 23 is fixedly connected to the bottom of one side of the sealing seat 9 away from the vacuum refining furnace 1, a second magnet 24 is arranged inside the rubber block 22, and the sides of the first magnet 23 and the second magnet 24 close to each other attract each other; during work, when power failure or fault occurs, the sealing seat 9 slides downwards to block the cooling water interface 5, the tap water interface 4 is opened, the first magnet 23 is close to the second magnet 24, the rubber block 22 is close to the cooling water interface 5, and a gap between the drainage pipe 19 and the rubber block 22 is opened; tap water after heat exchange in the cooling pipeline 2 enters the drain pipe 19, is discharged from a gap between the drain pipe 19 and the rubber block 22, enters the water storage tank for storage, is stored, is convenient for workers to carry out secondary utilization on the tap water, and improves the utilization rate of water resources.
As shown in fig. 3 and 6, a filtering shell 25 is bolted to the bottom of the tap water port 4, the top of the filtering shell 25 is communicated with the tap water port 4, a filter element 26 is slidably mounted on one side of the filtering shell 25, which is far away from the valve body 6, a third magnet 27 is slidably mounted on one side of the filtering shell 25, which is close to the valve body 6, one surfaces of the third magnet 27 and the second magnet 24, which are close to each other, are attracted to each other, a pull rope 28 is fixedly connected between the middle of the third magnet 27 and the bottom of the filter element 26, the pull rope 28 penetrates through a guide hole in the bottom of the filtering shell 25, and a plurality of third springs 29 are fixedly connected between one side of the outer ring of the second magnet 24, which is close to the valve body 6, and the inner wall of the valve body 6; the during operation, when having a power failure or breaking down, seal receptacle 9 lapse, make a magnet 23 keep away from with No. three magnet 27 mutually, make No. three magnet 27 under the promotion of No. three spring 29, No. three magnet 27 cunning to one side of filter core 26, loosen stay cord 28, filter core 26 is under the effect of buoyancy, slide in running water interface 4, filter the running water, get rid of the impurity incrustation scale in the running water effectively, thereby the impurity incrustation scale that has reduced the running water deposits on cooling tube 2 inner walls, the smoothness nature of rivers in the cooling tube 2 has then been improved.
A rubber pad 30 is fixedly connected to the top surface of the filter element 26, the filter element 26 and the rubber pad 30 have buoyancy, and the outer ring of the bottom surface of the rubber pad 30 is in sliding fit with the top opening of the filter shell 25; during operation, rubber pad 30 and the back of the inner wall top surface contact of running water interface 4, seal running water interface 4, have improved the comprehensiveness of running water through filter core 26, simultaneously, rubber pad 30 and the open-top sliding fit who filters casing 25 for filter core 26 gets into in filtering casing 25, seals filtering casing 25, has reduced the volume that the running water got into in filtering casing 25, has improved filter core 26's clean degree.
As shown in fig. 7, a plurality of groups of arc-shaped elastic pieces 31 are fixedly connected to the inner wall of the filter housing 25, a scraper 32 is fixedly connected to the middle of each group of arc-shaped elastic pieces 31, the scraper 32 is in sliding fit with the outer wall of the filter element 26, a plurality of sliding balls 33 are fixedly connected to one side of the scraper 32, which is close to the inner wall of the filter housing 25, and the outer wall of the sliding balls 33 is in sliding fit with the inner wall of the filter housing 25; during operation, when filter core 26 got into and filters casing 25 inside, scraper blade 32 rubbed filter core 26's outer wall, filtered the impurity on filter core 26 surface down, and the outer wall that filter core 26 was scraped to scraper blade 32 is for arc shell fragment 31 takes place to warp, makes scraper blade 32 take place to rotate, and smooth ball 33 slides with filtering casing 25 inner wall, thereby has improved filter core 26's whole clean degree, has improved the filtration efficiency to the running water then.
Example two
As shown in fig. 8, a first comparative example, in which another embodiment of the present invention is: an annular groove 34 is formed in the outer ring of the top surface of the bottom plate of the filter element 26, and a cotton strip annular plate 35 is bonded inside the annular groove 34; during operation, scraper blade 32 scrapes the impurity on filter core 26 surface, under arc shell fragment 31's elasticity effect for scraper blade 32 takes place to shake, shakes the impurity on scraper blade 32 and falls, and impurity falls into annular 34, and in the centre gripping silver crown plate 35, the probability that impurity drifted has been reduced, has then improved filter core 26's whole life.
When in work: when power failure or failure occurs, the vacuum refining furnace 1 is cooled, the electromagnet 7 is electrified to generate magnetic force, the armature 8 is sucked up along the cross guide rod 10 to drive the sealing seat 9 to slide, the sealing seat 9 blocks the tap water interface 4, the armature 8 drives the top surface of the ring plate 15 to contact and extrude with the top surface of the inner cavity of the valve body 6, the ring plate 15 slides downwards to push the annular air bag 16 to compress, air in the annular air bag 16 is pressed into the sealing air bag 18, the sealing air bag 18 expands to further block the tap water interface 4, and the cooling water interface 5 is opened;
at this time, the first magnet 23 is close to the third magnet 27, so that the third magnet 27 slides to the valve body 6, the pull rope 28 is driven to pull the filter element 26 to slide downwards into the filter shell 25, the scraper 32 rubs the outer wall of the filter element 26, impurities on the surface of the filter element 26 are filtered, the scraper 32 scrapes the outer wall of the filter element 26, the arc-shaped elastic sheet 31 is deformed, the scraper 32 rotates, the sliding ball 33 slides with the inner wall of the filter shell 25, and the integral cleaning degree of the filter element 26 is improved; the first magnet 23 is far away from the second magnet 24, so that the rubber block 22 blocks the drain pipe 19 and the drain pipe 19 under the elastic force of the second spring 21, cooling water enters the valve body 6 and is added into the cooling pipeline 2 in the vacuum refining furnace 1 to be cooled;
when power failure or failure occurs, the electromagnet 7 is powered off, so that the armature 8 slides downwards under the action of gravity, the sealing seat 9 is driven to slide downwards, the cooling water interface 5 is blocked, and the tap water interface 4 is opened;
at this time, the first magnet 23 is far away from the third magnet 27, so that the third magnet 27 slides to one side of the filter element 26 under the pushing of the third spring 29, the pull rope 28 is loosened, the filter element 26 slides into the tap water interface 4 under the action of buoyancy, the tap water is filtered, the impurity scale in the tap water is effectively removed, and the deposition of the impurity scale of the tap water on the inner wall of the cooling pipeline 2 is reduced; the first magnet 23 is close to the second magnet 24, so that the cooling water interface 5 of the rubber block 22 box is close to open the gap between the drain pipe 19 and the rubber block 22, tap water passes through the cooling pipeline 2 in the vacuum refining furnace 1 to be cooled, enters the drain pipe 19, is discharged from the gap between the drain pipe 19 and the rubber block 22, and enters the reservoir for storage; the automatic feeding of tap water into the cooling system is realized, continuous cooling work is carried out on the smelting furnace, and the waste of raw materials is reduced.
The front, the back, the left, the right, the upper and the lower are all based on figure 1 in the attached drawings of the specification, according to the standard of the observation angle of a person, the side of the device facing an observer is defined as the front, the left side of the observer is defined as the left, and the like.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the scope of the present invention.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A preparation method of a sintered Nd-Fe-B permanent magnetic material is characterized by comprising the following steps: the preparation method comprises the following steps:
s1: polishing the iron bar by using a polishing machine, and performing alkaline segmentation on the iron bar by using a cutting machine;
s2: adding rare earth elements of neodymium, an iron rod and refined boron into a smelting device, carrying out vacuum smelting, stopping heating until the iron rod is completely melted into the alloy liquid, adding cooling water into a cooling pipeline (2) in a vacuum refining furnace (1) through a water pump, cooling, and when power failure or fault occurs, cutting off power through an electromagnet (7) in a valve body (6), adding tap water into the cooling pipeline (2) in the vacuum refining furnace (1), and cooling; after the temperature is reduced to below 80 ℃, taking out the cast ingot;
s3: putting the cast ingot into a crushing device, and crushing to obtain alloy fine powder;
s4: weighing the alloy fine powder, adding the alloy fine powder into a forming die, closing the forming die by a press, and pressing and forming the alloy fine powder;
s5: polishing and cutting the surface of the molded sintered neodymium-iron-boron permanent magnet;
s6: and electroplating the shaped sintered neodymium iron boron permanent magnet to obtain a finished sintered neodymium iron boron permanent magnet.
2. The method for preparing the sintered NdFeB permanent magnet material according to claim 1, wherein the method comprises the following steps: the smelting device in S2 comprises a vacuum refining furnace (1) and a valve body (6); a cooling pipeline (2) is arranged inside the outer wall of the vacuum refining furnace (1), a valve body (6) is fixedly connected with one side of the outer wall of the vacuum refining furnace (1), the bottom inner cavity of the valve body (6) is communicated with the bottom interface of the cooling pipeline (2), one side of the valve body (6) far away from the vacuum refining furnace (1) is fixedly connected with a tap water interface (4) and a cooling water interface (5), the cooling water interface (5) is communicated with the top interface of the cooling pipeline (2) through a water pump, an electromagnet (7) is arranged in the top inner cavity of the valve body (6), a cross-shaped guide rod (10) is fixedly connected with the middle part of the bottom inner cavity of the valve body (6), the outer ring of the cross guide rod (10) is provided with an armature (8) in a sliding manner, one side of the armature (8) far away from the vacuum refining furnace (1) is fixedly connected with a sealing seat (9), and the sealing seat (9) is connected with the inner wall of the valve body (6) in a sliding manner.
3. The method for preparing the sintered NdFeB permanent magnet material according to claim 2, wherein the method comprises the following steps: the top surface and the bottom surface of the armature (8) are fixedly connected with a telescopic sleeve (3), one end, away from the armature (8), of the telescopic sleeve (3) is fixedly connected with the inner wall of the valve body (6), and the telescopic sleeve (3) is sleeved on the outer ring of the cross guide rod (10).
4. The method for preparing the sintered NdFeB permanent magnet material according to claim 2, wherein the method comprises the following steps: a sliding groove (11) is formed in the middle of the bottom surface of the armature (8), an oil bag (12) is arranged inside the sliding groove (11), an inner ring pipeline of the oil bag (12) is communicated with a sliding hole in the middle of the armature (8), and a push plate (14) is slidably mounted at the bottom of the sliding groove (11).
5. The method for preparing the sintered NdFeB permanent magnet material according to claim 2, wherein the method comprises the following steps: ring chamber (13) have been seted up to the inside of armature (8), the inside slidable mounting of ring chamber (13) has crown plate (15), the rigid coupling has annular gasbag (16) between the bottom surface of crown plate (15) and the bottom surface of ring chamber (13), the rigid coupling has a plurality of spring (17) between the top surface of crown plate (15) and the top surface of ring chamber (13), one side middle part that vacuum refining furnace (1) was kept away from in seal receptacle (9) is provided with sealed gasbag (18), sealed gasbag (18) and annular gasbag (16) pass through the trachea intercommunication.
6. The method for preparing the sintered NdFeB permanent magnet material according to claim 2, wherein the method comprises the following steps: the bottom of cooling water interface (5) is connected with bleeder line (19), the middle part rigid coupling of bleeder line (19) has No. two spring (21), the other end rigid coupling of No. two spring (21) has block rubber (22), the outer wall of block rubber (22) and the inner wall sliding fit of bleeder line (19), the one side bottom rigid coupling that vacuum refining furnace (1) was kept away from in seal receptacle (9) has magnet (23) No. one, the inside of block rubber (22) is provided with magnet (24) No. two, a magnet (23) attracts each other with the one side that magnet (24) are close to mutually No. two.
7. The method for preparing the sintered NdFeB permanent magnet material according to claim 2, wherein the method comprises the following steps: the bottom bolt of running water interface (4) has connect and has filtered casing (25), the top intercommunication running water interface (4) of filtering casing (25), one side slidable mounting that valve body (6) were kept away from in filtration casing (25) has filter core (26), it has No. three magnet (27) to filter one side slidable mounting that casing (25) is close to valve body (6), No. three magnet (27) attract each other with the one side that No. two magnet (24) are close to mutually, the rigid coupling has stay cord (28) between the middle part of No. three magnet (27) and the bottom of filter core (26), stay cord (28) run through the guiding hole of filtering casing (25) bottom, the rigid coupling has a plurality of No. three springs (29) between the inner wall of one side that the outer lane of No. two magnet (24) is close to valve body (6) and valve body (6).
8. The method for preparing the sintered NdFeB permanent magnet material according to claim 7, wherein the method comprises the following steps: the top surface rigid coupling of filter core (26) has rubber pad (30), filter core (26) and rubber pad (30) have buoyancy, the bottom surface outer lane of rubber pad (30) and the open-top sliding fit of filtering casing (25).
9. The method for preparing the sintered NdFeB permanent magnet material according to claim 7, wherein the method comprises the following steps: the inner wall rigid coupling of filtering casing (25) has multiunit arc shell fragment (31), and the middle part rigid coupling of every group arc shell fragment (31) has scraper blade (32), the outer wall sliding fit of scraper blade (32) and filter core (26), scraper blade (32) are close to filtering casing (25) inner wall one side rigid coupling and have a plurality of smooth balls (33), the outer wall of smooth ball (33) and filtering casing (25) inner wall sliding fit.
10. The method for preparing the sintered NdFeB permanent magnet material according to claim 9, wherein: annular groove (34) have been seted up to the bottom plate top surface outer lane of filter core (26), the inside bonding of annular groove (34) has silver crown plate (35).
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