阅读说明：本技术 一种复合稀土永磁材料的制备方法及防氧化混料设备 (Preparation method of composite rare earth permanent magnet material and anti-oxidation mixing equipment ) 是由 银国华 于 2020-11-23 设计创作，主要内容包括：本发明涉及稀土永磁材料技术领域,特别涉及一种复合稀土永磁材料的制备方法及防氧化混料设备；本发明的制备方法与现有技术相比,本发明设计合理,具有较高的矫顽力、抗压强度及剩磁、磁能积,且本发明解决了已有方法进行制粉、混料工艺时防氧化效率低下的问题。(The invention relates to the technical field of rare earth permanent magnet materials, in particular to a preparation method of a composite rare earth permanent magnet material and anti-oxidation mixing equipment; compared with the prior art, the preparation method has reasonable design and higher coercive force, compressive strength, remanence and magnetic energy product, and solves the problem of low oxidation resistance efficiency when the prior method is used for powder preparation and material mixing.)

1. A preparation method of a composite rare earth permanent magnetic material is characterized by comprising the following steps:

s1, preparing materials, wherein the composite rare earth permanent magnet material comprises the following raw materials in percentage by weight: 45-55% of neodymium iron boron magnetic powder, 16-22% of ferrite magnetic powder, 4-8% of samarium cobalt magnetic powder, 2-6% of alnico magnetic powder, 0.2-1.5% of polytetrafluoroethylene, 0.03-0.4% of potassium sorbate, 5.5-8.5% of propylene ester resin, 2-8% of polyethylene glycol terephthalate-1, 4-cyclohexanedimethanol ester, 1-1.8% of silane coupling agent, 1-1.8% of titanate coupling agent, 0.05-0.8% of graphite and 0.05-0.8% of barium stearate;

s2, smelting;

s3, hydrogen crushing;

s4, powder making and mixing: pulverizing and mixing materials by using anti-oxidation mixing equipment;

and S5, molding.

2. An anti-oxidation compounding equipment which characterized in that: the copper sheet feeding device comprises a barrel body, wherein a barrel cover is arranged at the upper end of the barrel body, a material guide pipeline, an air outlet pipeline and an inflation pipeline are sequentially arranged at the upper end of the barrel cover, a plurality of copper sheets are arranged in the air outlet pipeline, a conical end at the bottom of the barrel body is integrally connected with a buffer cavity, and a discharge pipeline is connected to the side end of the buffer cavity in a run-through manner; a hollow cylinder is vertically and concentrically arranged in the cylinder body, the upper end and the lower end of the hollow cylinder are respectively and rotatably connected with the cylinder cover and the buffer cavity, and an output shaft of a driving motor at the upper end of the cylinder body is rotatably communicated with the cylinder body and is connected with the upper end of the hollow cylinder; one end of the circulating gas pipe penetrates through the lower end of the buffer cavity and is communicated and connected with the bottom end of the hollow cylinder in a switching mode, the other end of the circulating gas pipe is communicated with the gas outlet pipeline, and the circulating gas pipe is provided with an electric circulating pump; a sieve plate is movably sleeved at the middle position of the outer wall of the hollow cylinder, and the side wall of the sieve plate is fixedly connected with the side wall of the cylinder body; a plurality of groups of stirring cutter groups are sequentially and equidistantly fixed on the side wall of the hollow cylinder at the upper end of the sieve plate from top to bottom, a plurality of groups of air distribution holes are arranged on the stirring cutter groups, the air distribution holes are communicated with a connecting pipe arranged in the stirring cutter groups, and the other end of the connecting pipe is communicated with the inner cavity of the hollow cylinder; and a crushing cutter set is assembled on the hollow cylinder at the lower end of the sieve plate, and an anti-blocking assembly is arranged on the hollow cylinder in the buffer cavity.

3. An anti-oxidation mixing apparatus according to claim 2, characterized in that: the copper sheets are of plate-shaped structures provided with through holes, the number of the copper sheets is a plurality of copper sheets, and the through holes of any two adjacent copper sheets are arranged in a staggered mode.

4. An anti-oxidation mixing apparatus according to claim 2, characterized in that: the crushing cutter set is a conical spiral piece, and the conical spiral piece is gradually reduced from top to bottom; the anti-blocking component is a spiral blade, and the spiral blade is sleeved on a hollow cylinder arranged in the buffer cavity.

5. An anti-oxidation mixing apparatus according to claim 2, characterized in that: the stirring knife group comprises a long stirring knife and a short stirring knife, the long stirring knife is positioned above the short stirring knife, the length of the long stirring knife is greater than that of the short stirring knife, the long stirring knife is detachably connected with the short stirring knife, and the long stirring knife and the short stirring knife are both in a boss shape; all link up on long stirring sword, the short stirring sword about the end evenly laid constant voltage hole, the connecting pipe is located inside the long stirring sword and evenly communicates on the connecting pipe have with the check valve of cloth gas pocket the same quantity, the check valve gas trend is by connecting pipe inner chamber flow direction outer end, check valve and corresponding cloth gas pocket be assembled between/be connected between, the hole is pressed to the constant pressure and cloth gas pocket one-to-one and space intercommunication.

6. An anti-oxidation mixing apparatus according to claim 5, characterized in that: the long stirring knife and the short stirring knife are connected through a reciprocating motion assembly, the long stirring knife and the short stirring knife are assembled in a sliding mode through a T-shaped groove and a T-shaped block, the length of the T-shaped block is smaller than that of the T-shaped groove, the inner side of the T-shaped groove is fixedly provided with the reciprocating motion assembly, the extending direction of the output end of the reciprocating motion assembly is consistent with the length direction of the T-shaped groove, and the output end of the reciprocating motion assembly is connected with the sliding end, arranged in the T-shaped groove, of the T-shaped block.

7. An anti-oxidation mixing apparatus according to claim 2, characterized in that: the inner wall of the cylinder body is fixedly provided with annular bulges with the same number as the stirring cutter set.

8. An anti-oxidation mixing apparatus according to claim 2, characterized in that: and a filter screen is arranged on one side of the air outlet pipeline close to the inner cavity of the cylinder body.

Technical Field

The invention relates to the technical field of rare earth permanent magnet materials, in particular to a preparation method of a composite rare earth permanent magnet material and anti-oxidation mixing equipment.

Background

The magnetic material, a ferromagnetic substance, is an ancient functional material with wide application, and the magnetism of the substance is known and applied by people as early as 3000 years ago, for example, the ancient natural magnet in China is used as a compass, and the permanent magnetic material is used as an important component of the magnetic material, so that the magnetic material plays an important role in the industries such as electronic industry, information industry, motorcycles, electric tools, automobile industry and the like; the method is widely applied to the industrial and consumer electronics fields of computers, mobile communication, advanced audio and video equipment, micromotors, sensors, magnetoelectric instruments, office equipment, electronic clocks, electronic cameras and the like.

At present, the components of the rare earth permanent magnet material applied in the existing market are mainly neodymium iron boron rare earth permanent magnet materials, the magnetic materials are further called as King due to excellent magnetic performance and have high magnetic energy product and high coercivity, but the Curie temperature is low, the thermal stability is low, the corrosion is easy, and the price of the neodymium iron boron magnetic materials is greatly increased due to wide use, so that the use cost is high; secondly, the ferrite permanent magnet material has lower use cost, good oxidation resistance and good temperature resistance, but has poor thermal stability; the samarium cobalt permanent magnet material has stable and reliable magnetic property, corrosion resistance, good oxidation resistance, good thermal stability and higher Curie temperature, but has lower magnetic energy product, small temperature coefficient and lower coercive force; the alnico permanent magnetic material has high Curie temperature, can be suitable for the high-temperature field which can not be met by the neodymium iron boron, but has high price. Therefore, the composite rare earth permanent magnetic material is developed, the defects of each permanent magnetic material are improved, the advantages of each permanent magnetic material are fully exerted, the composite rare earth permanent magnetic material has high cost performance, high magnetic energy product, good coercive force, stable thermal stability and high temperature resistance, and the composite rare earth permanent magnetic material meets the urgent requirements on high-performance permanent magnetic materials in future market development.

Meanwhile, the following process method is generally adopted in the preparation of the composite rare earth permanent magnet material: the method comprises the following steps of material preparation, smelting, hydrogen crushing, powder preparation by airflow milling, material mixing and molding, wherein in the powder preparation and material mixing preparation process, due to the existence of rare metals in each rare earth permanent magnet material, the rare earth permanent magnet material is easy to oxidize or spontaneously combust in the air in the powder preparation and material mixing processing process, so that inert gas needs to be continuously filled in the powder preparation and material mixing processing process for protection, and the anti-oxidation treatment mode in the powder preparation and material mixing processing process in the prior art has the following problems that firstly, the powder preparation and material mixing processing process is divided into two steps in the prior art, time and labor are wasted, and the cost is consumed. Secondly, in order to prevent the rare earth permanent magnetic materials from being oxidized in the preparation process, the existing anti-oxidation measures are usually to prevent the permanent magnetic materials and other formulas from being mixed with the residual air in the powder making charging barrel or the mixing barrel after entering the powder making charging barrel or the mixing barrel, and inert gas needs to be continuously charged through a charging port arranged at the upper end of the powder making charging barrel or the mixing barrel so as to eject the residual air, but the mode has the problems that a large amount of inert gas is discharged into the air at the moment of finishing ejecting the air, so that the resource is wasted, and the environment is easily influenced; meanwhile, in the processes of pulverizing and mixing, in order to prevent oxidation reaction between the pulverized and mixed materials and the air mixed in the raw materials in the prior art, inert gas is often filled in the powder barrel or the mixing barrel for oxidation resistance, but the inert gas cannot be ensured to circularly flow in the prior art, and the inert gas which is still cannot effectively enter the raw materials to further prevent the raw materials from being oxidized, so that the low oxidation resistance efficiency is caused.

Disclosure of Invention

The invention aims to provide a preparation method of a composite rare earth permanent magnetic material and anti-oxidation mixing equipment, which can effectively solve the problems in the background art.

The technical scheme adopted by the invention is as follows: a preparation method of a composite rare earth permanent magnetic material is characterized by comprising the following steps:

step 1, proportioning, namely a composite rare earth permanent magnet material, which comprises the following raw materials in percentage by weight: 45-55% of neodymium iron boron magnetic powder, 16-22% of ferrite magnetic powder, 4-8% of samarium cobalt magnetic powder, 2-6% of alnico magnetic powder, 0.2-1.5% of polytetrafluoroethylene, 0.03-0.4% of potassium sorbate, 5.5-8.5% of propylene ester resin, 2-8% of polyethylene glycol terephthalate-1, 4-cyclohexanedimethanol ester, 1-1.8% of silane coupling agent, 1-1.8% of titanate coupling agent, 0.05-0.8% of graphite and 0.05-0.8% of barium stearate;

step 2, smelting: respectively carrying out sheet casting or ingot casting on the prepared materials through a large furnace and a small furnace;

step 3, hydrogen crushing: fusing the rare earth alloy in a hydrogen environment by utilizing the hydrogen absorption characteristic of the rare earth metal compound;

step 4, pulverizing and mixing: pulverizing and mixing materials by using anti-oxidation mixing equipment;

step 5, forming: and selecting a corresponding mold according to requirements, and pressing the mixed fine powder into a required shape.

An anti-oxidation compounding equipment which characterized in that: the copper sheet feeding device comprises a barrel body, wherein a barrel cover is arranged at the upper end of the barrel body, a material guide pipeline, an air outlet pipeline and an inflation pipeline are sequentially arranged at the upper end of the barrel cover, a plurality of copper sheets are arranged in the air outlet pipeline, a conical end at the bottom of the barrel body is integrally connected with a buffer cavity, and a discharge pipeline is connected to the side end of the buffer cavity in a run-through manner; a hollow cylinder is vertically and concentrically arranged in the cylinder body, the upper end and the lower end of the hollow cylinder are respectively and rotatably connected with the cylinder cover and the buffer cavity, and an output shaft of a driving motor at the upper end of the cylinder body is rotatably communicated with the cylinder body and is connected with the upper end of the hollow cylinder; one end of the circulating gas pipe penetrates through the lower end of the buffer cavity and is communicated and connected with the bottom end of the hollow cylinder in a switching mode, the other end of the circulating gas pipe is communicated with the gas outlet pipeline, and the circulating gas pipe is provided with an electric circulating pump; a sieve plate is movably sleeved at the middle position of the outer wall of the hollow cylinder, and the side wall of the sieve plate is fixedly connected with the side wall of the cylinder body; a plurality of groups of stirring cutter groups are sequentially and equidistantly fixed on the side wall of the hollow cylinder at the upper end of the sieve plate from top to bottom, a plurality of groups of air distribution holes are arranged on the stirring cutter groups, the air distribution holes are communicated with a connecting pipe arranged in the stirring cutter groups, and the other end of the connecting pipe is communicated with the inner cavity of the hollow cylinder; and a crushing cutter set is assembled on the hollow cylinder at the lower end of the sieve plate, and an anti-blocking assembly is arranged on the hollow cylinder in the buffer cavity.

Furthermore, the copper sheets are of a plate-shaped structure provided with through holes, the number of the copper sheets is a plurality of the copper sheets, and the through holes of any two adjacent copper sheets are arranged in a staggered manner.

Furthermore, the crushing cutter set is a conical spiral piece, and the conical spiral piece is gradually reduced from top to bottom; the anti-blocking component is a spiral blade, and the spiral blade is sleeved on a hollow cylinder arranged in the buffer cavity.

Further, the stirring knife group comprises a long stirring knife and a short stirring knife, the long stirring knife is positioned above the short stirring knife, the length of the long stirring knife is greater than that of the short stirring knife, the long stirring knife is detachably connected with the short stirring knife, and the long stirring knife and the short stirring knife are both in a boss shape; all link up on long stirring sword, the short stirring sword about the end evenly laid constant voltage hole, the connecting pipe is located inside the long stirring sword and evenly communicates on the connecting pipe have with the check valve of cloth gas pocket the same quantity, the check valve gas trend is by connecting pipe inner chamber flow direction outer end, check valve and corresponding cloth gas pocket be assembled between/be connected between, the hole is pressed to the constant pressure and cloth gas pocket one-to-one and space intercommunication.

Furthermore, long stirring sword, short stirring sword junction are equipped with the reciprocating motion subassembly, through T type groove and T type piece sliding assembly between long stirring sword, the short stirring sword, and the length of T type piece is less than the length in T type groove, and T type inslot side has set firmly the reciprocating motion subassembly and the reciprocating motion subassembly output extending direction is unanimous with the length direction in T type groove, and the output of reciprocating motion subassembly and T type piece are arranged the slip end in T type groove and are connected.

Furthermore, the inner wall of the cylinder body is fixedly provided with annular bulges with the same number as the stirring cutter set.

Furthermore, a filter screen is arranged on one side of the air outlet pipeline close to the inner cavity of the cylinder body.

The invention has the beneficial effects that:

compared with the prior art, the preparation method has higher coercive force, compressive strength, remanence (Br) and magnetic energy product (BH) max; meanwhile, the raw material components of the invention are necessary for realizing excellent performance of the composite rare earth permanent magnetic material, and once one of the components is lacked, the performance of the composite rare earth permanent magnetic material is reduced.

The invention has reasonable design, solves the problems of time and labor waste and cost consumption caused by two steps of powder preparation and material mixing in the prior art, easily discharges a large amount of inert gas into the air by adopting the prior art, easily influences the environment while wasting resources, and simultaneously causes low anti-oxidation efficiency because the air in the powder preparation and material mixing processing process is not thoroughly removed.

In the invention, the anti-oxidation mixing equipment effectively combines the stirring cutter set and the crushing cutter set, so that the continuous operation of the whole cylinder is realized from top to bottom, and the anti-oxidation mixing equipment has the advantages of uniform stirring and thorough crushing of mixed raw materials and high production efficiency.

According to the invention, the anti-blocking component is arranged, so that the mixed raw materials in the barrel can be taken out in the continuous rotating process of the rotary vane, and the phenomenon that the mixed raw materials at the lower end are caked due to the extrusion of the mixed raw materials at the upper end is avoided, and then the discharge pipeline is blocked.

According to the invention, through the mutual matching of the water balance pressure and the air distribution holes, when the mixed raw material passes through the constant pressure holes, the inert gas penetrating out of the air distribution holes can fully and effectively drive away the air doped in the mixed raw material, so that the oxygen in the air and the mixed raw material are prevented from being oxidized, and the anti-oxidation efficiency is improved.

According to the invention, the reciprocating motion assembly is arranged, so that the long stirring knife and the short stirring knife perform relative motion, different centrifugal forces are generated in the barrel, the turbulence intensity of mixed raw materials at different positions in the barrel is different, and the stirring effect is improved.

The use principle of the anti-oxidation mixing equipment of the invention is as follows: when the air purifier is used, firstly, the electric circulating pump is started, air in the cylinder is discharged from the air outlet pipeline at the upper end of the cylinder, the copper sheet exists in the air outlet pipeline, so that the reaction of oxygen in the air and the copper sheet is fully and effectively ensured to form copper oxide, the removal of the oxygen is realized, the air passing through the copper sheet is guided into the inner cavity of the hollow cylinder through the circulating air pipe, the air in the hollow cylinder is ejected out of the cylinder due to the continuous aggregation of the air in the hollow cylinder, the operation is repeated until the oxygen content in the cylinder is below 0.1 percent, and then inert gas is supplemented into the cylinder through the air charging pipeline to restore the pressure in the cylinder to the normal pressure; then, after the previous process for preparing the composite rare earth permanent magnetic material is completed, the discharge port of the hydrogen crushing device is butted with the material guide pipeline of the invention, the mixed raw material is poured into the cylinder body, meanwhile, a driving motor is started, the driving motor drives the stirring cutter set and the crushing cutter set to rotate in sequence, the stirring cutter set effectively realizes the stirring effect on the mixed raw materials under the mutual matching action of the long stirring cutter and the short stirring cutter, the crushing cutter set effectively realizes the crushing effect on the mixed raw materials, the dynamic circulation pump still works at the moment, so that the inert gas in the hollow cylinder flows in a circulating way, when mixing the raw materials through the constant voltage hole, the inert gas of wearing out in the cloth gas pocket can fully effectually drive away the air of doping in mixing the raw materials, prevents that the oxygen in the air from oxidizing with mixing the raw materials, promotes anti-oxidation efficiency, and remaining air is got rid of oxygen when contacting with the copper sheet simultaneously.

Drawings

Fig. 1 is a schematic front-end three-dimensional structure of an anti-oxidation mixing device.

Fig. 2 is a schematic view of the upper end of the anti-oxidation mixing equipment.

Fig. 3 is a schematic sectional structure view of the anti-oxidation mixing equipment.

Fig. 4 is a partial structural diagram of the air outlet pipe and the internal structure.

Fig. 5 is a schematic view of a partial assembly structure of the inside of the cylinder.

Fig. 6 is a schematic perspective view of the stirring blade set.

Fig. 7 is a schematic view of a partial three-dimensional structure of an anti-oxidation mixing device.

In the figure: the device comprises a cylinder body 1, a cylinder cover 2, a material guide pipeline 3, an air outlet pipeline 4, an air charging pipeline 5, copper sheets 6, a buffer cavity 7, a material discharging pipeline 8, a hollow cylinder 9, a driving motor 10, a circulating air pipe 11, an electric circulating pump 12, a sieve plate 13, a stirring knife group 14, a long stirring knife 14-1, a short stirring knife 14-2, an air distribution hole 15, a connecting pipe 16, a conical spiral piece 17, a spiral blade 18, a constant pressure hole 19, a one-way valve 20, a reciprocating motion assembly 21, an annular bulge 22 and a filter screen 23.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.

Example 1:

a preparation method of a composite rare earth permanent magnetic material comprises the following steps:

step 1, proportioning, namely a composite rare earth permanent magnet material, which comprises the following raw materials in percentage by weight: 48% of neodymium iron boron magnetic powder, 20% of ferrite magnetic powder, 8% of samarium cobalt magnetic powder, 4% of aluminum nickel cobalt magnetic powder, 1.5% of polytetrafluoroethylene, 0.4% of potassium sorbate, 8% of acrylic resin, 6% of polyethylene glycol terephthalate-1, 4-cyclohexanedimethanol ester, 1.6% of silane coupling agent, 1.3% of titanate coupling agent, 0.7% of graphite and 0.5% of barium stearate;

step 2, smelting: respectively carrying out sheet casting or ingot casting on the prepared materials through a large furnace and a small furnace;

step 3, hydrogen crushing: fusing the rare earth alloy in a hydrogen environment by utilizing the hydrogen absorption characteristic of the rare earth metal compound;

step 4, pulverizing and mixing: pulverizing and mixing materials by using anti-oxidation mixing equipment;

step 5, forming: and selecting a corresponding mold according to requirements, and pressing the mixed fine powder into a required shape.

Example 2

A preparation method of a composite rare earth permanent magnetic material comprises the following steps:

step 1, proportioning, namely a composite rare earth permanent magnet material, which comprises the following raw materials in percentage by weight: 50% of neodymium iron boron magnetic powder, 22% of ferrite magnetic powder, 4% of samarium cobalt magnetic powder, 4% of aluminum nickel cobalt magnetic powder, 0.7% of polytetrafluoroethylene, 0.3% of potassium sorbate, 8.5% of acrylic resin, 6% of polyethylene terephthalate-1, 4-cyclohexanedimethanol ester, 1.6% of silane coupling agent, 1.3% of titanate coupling agent, 0.8% of graphite and 0.8% of barium stearate;

step 2, smelting: respectively carrying out sheet casting or ingot casting on the prepared materials through a large furnace and a small furnace;

step 3, hydrogen crushing: fusing the rare earth alloy in a hydrogen environment by utilizing the hydrogen absorption characteristic of the rare earth metal compound;

step 4, pulverizing and mixing: pulverizing and mixing materials by using anti-oxidation mixing equipment;

step 5, forming: and selecting a corresponding mold according to requirements, and pressing the mixed fine powder into a required shape.

Example 3:

a preparation method of a composite rare earth permanent magnetic material comprises the following steps:

step 1, proportioning, namely a composite rare earth permanent magnet material, which comprises the following raw materials in percentage by weight: 44% of neodymium iron boron magnetic powder, 22% of ferrite magnetic powder, 8% of samarium cobalt magnetic powder, 6% of aluminum nickel cobalt magnetic powder, 0.3% of polytetrafluoroethylene, 0.4% of potassium sorbate, 8% of propylene ester resin, 7.5% of polyethylene glycol terephthalate-1, 4-cyclohexanedimethanol ester, 1.7% of silane coupling agent, 1.3% of titanate coupling agent, 0.3% of graphite and 0.5% of barium stearate;

step 2, smelting: respectively carrying out sheet casting or ingot casting on the prepared materials through a large furnace and a small furnace;

step 3, hydrogen crushing: fusing the rare earth alloy in a hydrogen environment by utilizing the hydrogen absorption characteristic of the rare earth metal compound;

step 4, pulverizing and mixing: pulverizing and mixing materials by using anti-oxidation mixing equipment;

step 5, forming: and selecting a corresponding mold according to requirements, and pressing the mixed fine powder into a required shape.

Comparative example 1:

the composite rare earth permanent magnetic material comprises the following raw materials in percentage by weight: 48% of neodymium iron boron magnetic powder, 20% of ferrite magnetic powder, 8% of samarium cobalt magnetic powder, 4% of aluminum nickel cobalt magnetic powder, 0.4% of potassium sorbate, 8% of propylene resin, 6% of polyethylene glycol terephthalate-1, 4-cyclohexane dimethanol ester, 1.6% of silane coupling agent, 1.3% of titanate coupling agent, 0.7% of graphite and 0.5% of barium stearate.

Comparative example 2:

the composite rare earth permanent magnetic material comprises the following raw materials in percentage by weight: 48% of neodymium iron boron magnetic powder, 20% of ferrite magnetic powder, 8% of samarium cobalt magnetic powder, 4% of aluminum nickel cobalt magnetic powder, 1.5% of polytetrafluoroethylene, 8% of propylene ester resin, 6% of polyethylene glycol terephthalate-1, 4-cyclohexane dimethanol ester, 1.6% of silane coupling agent, 1.3% of titanate coupling agent, 0.7% of graphite and 0.5% of barium stearate.

Comparative example 3:

the composite rare earth permanent magnetic material comprises the following raw materials in percentage by weight: 48% of neodymium iron boron magnetic powder, 20% of ferrite magnetic powder, 8% of samarium cobalt magnetic powder, 4% of aluminum nickel cobalt magnetic powder, 1.5% of polytetrafluoroethylene, 0.4% of potassium sorbate, 6% of polyethylene glycol terephthalate-1, 4-cyclohexane dimethanol ester, 1.6% of silane coupling agent, 1.3% of titanate coupling agent, 0.7% of graphite and 0.5% of barium stearate.

Comparative example 4:

the composite rare earth permanent magnetic material comprises the following raw materials in percentage by weight: 48% of neodymium iron boron magnetic powder, 20% of ferrite magnetic powder, 8% of samarium cobalt magnetic powder, 4% of aluminum nickel cobalt magnetic powder, 1.5% of polytetrafluoroethylene, 0.4% of potassium sorbate, 8% of acrylic resin, 1.6% of silane coupling agent, 1.3% of titanate coupling agent, 0.7% of graphite and 0.5% of barium stearate.

Comparative example 5:

the composite rare earth permanent magnetic material comprises the following raw materials in percentage by weight: 48% of neodymium iron boron magnetic powder, 20% of ferrite magnetic powder, 8% of samarium cobalt magnetic powder, 4% of aluminum nickel cobalt magnetic powder, 1.5% of polytetrafluoroethylene, 0.4% of potassium sorbate, 8% of propylene ester resin, 6% of polyethylene glycol terephthalate-1, 4-cyclohexane dimethanol ester, 2.9% of silane coupling agent, 0.7% of graphite and 0.5% of barium stearate.

The magnetic properties and mechanical properties of examples 1 to 3 and comparative examples 1 to 6 were measured, respectively, and the results are shown in the following table.

As can be seen from Table 1, the composite rare earth permanent magnetic material has high coercive force, high compressive strength, high remanence (Br) and high magnetic energy product (BH) max; meanwhile, the raw material components in the invention are necessary for realizing excellent performance of the composite rare earth permanent magnet material, once one of the components is lacked, the performance of the composite rare earth permanent magnet material is reduced, and each index is reduced after one component is respectively omitted in the comparative examples 1-6, so that the performance of the composite rare earth permanent magnet material can be realized only by matching the raw material components.

Example 4:

referring to fig. 1 to 7, the anti-oxidation mixing device comprises a barrel body 1, a barrel cover 2 is hermetically assembled at the upper end of the barrel body 1, a material guide pipeline 3, an air outlet pipeline 4 and an air charging pipeline 5 are sequentially arranged at the upper end of the barrel cover 2, a plurality of copper sheets 6 are arranged in the air outlet pipeline 4, in the embodiment, the number of the copper sheets 6 is 2, the through holes of any two adjacent copper sheets 6 are arranged in a staggered manner, the air entering the air outlet pipeline 4 cannot form linear air flow due to the staggered through holes, so that the air is disturbed, the oxygen in the air and the copper sheets 6 are fully and effectively ensured to react to form copper oxide, the oxygen is removed, a buffer cavity 7 is integrally formed at the tapered end of the bottom of the barrel body 1 and is connected with the buffer cavity 7 so as to reserve space for subsequently installing anti-blocking components therein, and a storage space for the composite rare earth permanent magnet raw material is increased to a certain extent, the side end of the buffer cavity 7 is connected with a discharge pipeline 8 in a through way; the inner part of the cylinder body 1 is vertically and concentrically provided with a hollow cylinder 9, the upper end of the hollow cylinder 9 is rotatably connected with the cylinder cover 2 through a sealing bearing, the upper end of the cylinder body 1 is fixedly connected with a driving motor 10 through a base, an output shaft of the driving motor 10 is rotatably sealed to penetrate through the center of the upper end of the cylinder body 1 and is connected with the upper end of the hollow cylinder 9 through the sealing bearing, the driving motor 10 is electrically connected with a power generation device (the power generation device can be a generator or a storage battery, the storage battery is the prior art and is not described herein any more and shown in the figures), the lower end of the hollow cylinder 9 is rotatably connected with the lower end of the buffer cavity 7 through the sealing bearing, one end of the circulating air pipe 11 is sequentially sealed to penetrate through the lower end of the buffer cavity 7 and the lower end of the hollow cylinder 9 and is in switching connection with, an electric circulating pump 12 (brand: CZTRYQ, model: RS) is arranged on the circulating gas pipe 11, and the electric circulating pump 12 is electrically connected with the storage battery; the middle position of the outer wall of the hollow cylinder 9 is movably sleeved with a sieve plate 13, the side wall of the sieve plate 13 is fixedly connected with the side wall of the cylinder body 1, a plurality of groups of stirring knife sets 14 are sequentially and equidistantly arranged on the side wall of the hollow cylinder 9 at the upper end of the sieve plate 13 from top to bottom, the stirring knife sets 14 can effectively and fully mix mixed raw materials, in the embodiment, 3 groups of stirring knife sets 14 are adopted, a plurality of groups of air distribution holes 15 are formed in the stirring knife sets 14, the air distribution holes 15 are communicated with a connecting pipe 16 arranged in the stirring knife sets 14, and the other end of the connecting pipe 16 is; be equipped with broken knife tackle on the hollow cylinder 9 of lower extreme of sieve 13, broken knife tackle is tapered form flight 17 in this embodiment, tapered form flight 17 top-down progressively diminishes, the installation of broken knife tackle can be further broken to the raw materials through sieve 13, it is abundant broken to reach the mixed raw materials, install on the hollow cylinder 9 of arranging in cushion chamber 7 and prevent stifled subassembly, prevent stifled subassembly in this embodiment being helical blade 18, helical blade 18 cover is located on arranging the hollow cylinder 9 of cushion chamber 7 in, be convenient for take out the mixed raw materials in barrel 1 at the continuous rotatory in-process of wheel flight through preventing setting up of preventing stifled subassembly, avoid causing the lower extreme mixed raw materials caking because the extrusion of upper end mixed raw materials, and then make ejection of compact pipeline 8 block up.

By means of the technical scheme, the anti-oxidation mixing equipment effectively combines the stirring cutter set 14 and the crushing cutter set, so that continuous operation is realized inside the whole barrel 1 from top to bottom, and the anti-oxidation mixing equipment has the advantages of uniform stirring and thorough crushing of mixed raw materials and high production efficiency.

As a preferred embodiment, the stirring knife group 14 comprises a long stirring knife 14-1 and a short stirring knife 14-2, the long stirring knife 14-1 is positioned above the short stirring knife 14-2, the length of the long stirring knife 14-1 is greater than that of the short stirring knife 14-2, the long stirring knife 14-1 and the short stirring knife 14-2 are arranged in different lengths to ensure that centrifugal forces with different sizes are generated during stirring, so that the turbulence intensity of mixed raw materials at different positions in the cylinder body 1 is different, the stirring effect is enhanced, the long stirring knife 14-1 is detachably connected with the short stirring knife 14-2, the subsequent replacement and maintenance of the short stirring knife 14-2 are facilitated, the shapes of the long stirring knife 14-1 and the short stirring knife 14-2 are both boss-shaped, and further the long stirring knife 14-1 and the short stirring knife 14-2 are enhanced, The cutting effect of the short stirring knife 14-2 on the mixed raw materials; constant pressure holes 19 are uniformly distributed on the long stirring knife 14-1 and the short stirring knife 14-2 through the upper end and the lower end, so that when the mixed raw materials pass through the constant pressure holes 19, the pressures of the upper ends and the lower ends of the long stirring knife 14-1 and the short stirring knife 14-2 are the same, and the mixed raw materials are prevented from being adhered to the long stirring knife 14-1 and the short stirring knife 14-2; the connecting pipe 16 is arranged inside the long stirring knife 14-1 in a penetrating manner, the connecting pipe 16 is uniformly communicated with one-way valves 20 with the same number as the air distribution holes 15, the air of the one-way valves 20 flows from the inner cavity of the connecting pipe 16 to the outer end, and the one-way valves 20 are assembled and connected with the corresponding air distribution holes 15; the balance pressure holes vertically arranged on the long stirring knife 14-1 correspond to the air distribution holes 15 transversely arranged on the long stirring knife 14-1 one by one and are communicated with each other in space, and the balance pressure holes and the air distribution holes 15 are matched with each other, so that when the mixed raw material passes through the constant pressure holes 19, inert gas penetrating out of the air distribution holes 15 can fully and effectively drive away air doped in the mixed raw material, oxygen in the air and the mixed raw material are prevented from being oxidized, and the anti-oxidation efficiency is improved.

As a preferred embodiment, in order to enable the long stirring knife 14-1 and the short stirring knife 14-2 to perform relative motion, a reciprocating component 21 is disposed at a joint of the long stirring knife 14-1 and the short stirring knife 14-2, in this embodiment, the reciprocating component 21 is an electric telescopic rod (an electric telescopic rod is a prior art and is not described here again), the electric telescopic rod is electrically connected to the storage battery, the long stirring knife 14-1 and the short stirring knife 14-2 are slidably assembled with a T-shaped block through a T-shaped groove, the length of the T-shaped block is smaller than that of the T-shaped groove, the electric telescopic rod is fixedly disposed inside the T-shaped groove, the extending direction of the output end of the electric telescopic rod is consistent with the length direction of the T-shaped groove, and the output end of the electric telescopic rod is connected to. The long stirring knife 14-1 and the short stirring knife 14-2 which move relatively further ensure that different centrifugal forces are generated in the cylinder 1, so that the turbulence intensity of the mixed raw materials at different positions in the cylinder 1 is different, and the stirring effect is improved.

In a preferred embodiment, the annular protrusions 22 are welded to the inner wall of the cylinder 1, and the annular protrusions 22 are welded to the inner wall of the cylinder 1, so that the mixed raw materials at different positions in the cylinder 1 are different, and the effect of the difference in the turbulence intensity in the cylinder 1 can be improved.

As a preferred embodiment, the driving motor 10, the electric telescopic rod, and the electric circulating pump 12 are electrically connected to a control panel, and the control panel is electrically connected to the storage battery (the control panel is prior art, and is not described herein and not shown in the drawings).

As a preferred embodiment, a filter screen 23 is arranged on one side of the air outlet pipeline 4 close to the inner cavity of the cylinder 1, and the filter screen 23 is arranged to prevent mixed raw materials in the cylinder 1 from being sucked in the air exhaust process.

By means of the technical scheme, the use principle of the anti-oxidation mixing equipment is as follows: when the air purifier is used, firstly, the electric circulating pump 12 is started, air in the barrel 1 is discharged from the air outlet pipeline 4 at the upper end of the barrel 1, the copper sheet 6 exists in the air outlet pipeline 4, so that oxygen in the air is fully and effectively ensured to react with the copper sheet 6 to form copper oxide, the removal of the oxygen is realized, the air passing through the copper sheet 6 is guided into the inner cavity of the hollow cylinder 9 through the circulating air pipe 11, the air in the hollow cylinder is continuously gathered, so that the air in the hollow cylinder is ejected out of the barrel 1 in cycles until the oxygen content in the barrel 1 reaches below 0.1%, and then the inert gas is supplemented into the barrel 1 through the air charging pipeline 5 to restore the pressure in the barrel 1 to normal pressure; then, after one process is finished in the preparation of the composite rare earth permanent magnetic material, a discharge port of a hydrogen crushing device is butted with a material guide pipeline 3, the mixed raw material is poured into the cylinder 1, a driving motor 10 is started at the same time, the driving motor 10 sequentially drives a stirring cutter set 14 and a crushing cutter set to rotate, the stirring cutter set 14 effectively realizes the stirring effect on the mixed raw material under the mutual matching action of a long stirring cutter 14 and a short stirring cutter 14-2, the crushing cutter set effectively realizes the crushing effect on the mixed raw material, a dynamic circulating pump still works at the moment, inert gas in the hollow cylinder 9 circularly flows, when the mixed raw material passes through a constant pressure hole 19, the inert gas penetrating through a gas distribution hole 15 can fully and effectively drive air doped in the mixed raw material, the oxygen in the air and the mixed raw material are prevented from being oxidized, and the anti-oxidation efficiency is improved, while the remaining air removes oxygen when in contact with the copper sheet 6.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.