A preparation method of composite rare earth permanent magnetic material and anti-oxidation mixing equipment

Abstract

The invention relates to the technical field of rare earth permanent magnet materials, and in particular to a preparation method of a composite rare earth permanent magnet material and an anti-oxidation mixing device. Compared with the prior art, the preparation method of the invention has a reasonable design, has higher coercive force, compressive strength, remanence and magnetic energy product, and solves the problem of low anti-oxidation efficiency in the powder making and mixing processes of the prior art.

Description

Technical Field

[0001] The invention relates to the technical field of rare earth permanent magnetic materials, and in particular to a preparation method of a composite rare earth permanent magnetic material and an anti-oxidation mixing device. Background Art

[0002] Magnetic material, a kind of strong magnetic substance, is an ancient functional material with a wide range of uses. The magnetism of materials has been recognized and applied by people as early as 3,000 years ago. For example, natural magnets were used as compasses in ancient China. Permanent magnetic materials, as an important component of magnetic materials, play an important role in the electronics industry, information industry, motorcycles, power tools, automobile industry and other industries. They have been widely used in industrial and consumer electronics fields such as computers, mobile communications, advanced audio and video equipment, micromotors, sensors and magnetoelectric instruments, office equipment, electronic clocks, electronic cameras, etc.

[0003] At present, the rare earth permanent magnet materials used in the existing market are mainly NdFeB rare earth permanent magnet materials. This type of magnetic material is called the king of magnets because of its excellent magnetic properties and has high magnetic energy product and high coercivity, but has low Curie temperature, low thermal stability, and is easy to corrode. In addition, the price of NdFeB magnetic materials has risen sharply due to their wide use, and the cost of use is high; followed by ferrite permanent magnet materials with low cost of use, good oxidation resistance and good temperature resistance, but poor thermal stability; SmCo permanent magnet materials have stable and reliable magnetic properties, corrosion resistance, good oxidation resistance, good thermal stability, and high Curie temperature, but low magnetic energy product, small temperature coefficient, and low coercivity; AlNiCo permanent magnet materials have high Curie temperature and can be used in high temperature fields that NdFeB cannot handle, but they are expensive. Therefore, a composite rare earth permanent magnet material is developed to improve the shortcomings of each permanent magnet material, give full play to the advantages of various permanent magnet materials, make it have high cost performance, high magnetic energy product, good coercivity, stable thermal stability, and high temperature resistance, which meets the urgent demand for high-performance permanent magnet materials in the future market development.

[0004] At the same time, the following process methods are usually used in the preparation of the above-mentioned composite rare earth permanent magnet material: batching, smelting, hydrogen crushing, air flow grinding, mixing, and molding. Among them, in the process of powder making and mixing preparation, due to the presence of rare metals in each rare earth permanent magnet material, it is often easy to be oxidized or spontaneously combust in the air during the powder making and mixing process. Therefore, in the process of powder making and mixing, it is necessary to continuously fill in inert gas for protection. The prior art has the following problems with the anti-oxidation treatment method in the powder making and mixing process: First, the prior art often divides the powder making and mixing process into two steps, which is time-consuming, labor-intensive and costly. Second, in order to prevent the oxidation of various rare earth permanent magnetic materials during the preparation process, the existing anti-oxidation measures often prevent the permanent magnetic materials and other formulas from mixing with the residual air in the powder making barrel or mixing barrel after entering the powder making barrel or mixing barrel. It is necessary to continuously fill in inert gas through the inflation port set at the upper end of the powder barrel or mixing barrel to push out the residual air. However, the problem with this method is that a large amount of inert gas will be discharged into the air at the moment when the air is pushed out, which wastes resources and easily affects the environment. At the same time, in the process of powder making and mixing, in order to prevent the oxidation reaction of the air mixed with the raw materials during the powder making and mixing process, the existing technology often fills the powder barrel or mixing barrel with inert gas for anti-oxidation, but the existing technology cannot ensure the circulation of the inert gas filled, and the stationary inert gas is difficult to effectively enter the raw material to prevent the oxidation of the raw material, resulting in low anti-oxidation efficiency. Summary of the invention

[0005] The object of the present invention is to provide a method for preparing a composite rare earth permanent magnet material and an anti-oxidation mixing device, which can effectively solve the problems mentioned in the above background technology.

[0006] The technical solution adopted by the present invention is as follows: A method for preparing a composite rare earth permanent magnetic material, characterized in that it comprises the following steps:

[0007] Step 1, ingredients, a composite rare earth permanent magnet material includes the following raw materials in weight percentage: 45-55% of neodymium iron boron magnetic powder, 16-22% of ferrite magnetic powder, 4-8% of samarium cobalt magnetic powder, 2-6% of aluminum nickel cobalt magnetic powder, 0.2-1.5% of polytetrafluoroethylene, 0.03-0.4% of potassium sorbate, 5.5-8.5% of acrylic resin, 2-8% of polyethylene terephthalate-1,4-cyclohexanedimethanol, 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;

[0008] Step 2, smelting: the prepared materials are respectively cast into sheets or ingots through a large furnace and a small furnace;

[0009] Step 3, hydrogen crushing: using the hydrogen absorption properties of rare earth metal compounds, the rare earth alloys are fused in a hydrogen environment;

[0010] Step 4, powder making and mixing: powder making and mixing are performed using anti-oxidation mixing equipment;

[0011] Step 5, molding: Select the corresponding mold according to the requirements and press the mixed fine powder into the required shape.

[0012] An anti-oxidation mixing device, characterized in that: it comprises a cylinder, a cylinder cover is provided at the upper end of the cylinder, a material guide pipe, an air outlet pipe and an air charging pipe are provided at the upper end of the cylinder cover in sequence, a plurality of copper sheets are provided in the air outlet pipe, a buffer chamber is integrally formed at the conical end of the bottom of the cylinder, and a discharge pipe is connected to the side end of the buffer chamber; a hollow cylinder is provided vertically and concentrically inside the cylinder, the upper and lower ends of the hollow cylinder are rotatably connected to the cylinder cover and the buffer chamber respectively, and the output shaft of the driving motor at the upper end of the cylinder rotates through the cylinder and is connected to the upper end of the hollow cylinder; one end of the circulating air pipe passes through the lower end of the buffer chamber and the bottom of the hollow cylinder The two ends are connected and transferred, the other end of the circulating air pipe is connected to the air outlet pipe, and the circulating air pipe is provided with an electric circulating pump; a sieve plate is movably sleeved on the middle position of the outer wall of the hollow cylinder, and the side wall of the sieve plate is fixedly connected to the side wall of the cylinder; a plurality of stirring knife groups are fixedly arranged on the side wall of the hollow cylinder at the upper end of the sieve plate in sequence and equidistantly from top to bottom, and a plurality of air distribution holes are provided on the stirring knife group, and the air distribution holes are connected with the connecting pipe provided in the stirring knife group, and the other end of the connecting pipe is connected with the inner cavity of the hollow cylinder; a crushing knife group is installed on the hollow cylinder at the lower end of the sieve plate, and an anti-blocking component is provided on the hollow cylinder placed in the buffer cavity.

[0013] Furthermore, the copper sheets are plate-like structures with through holes, and there are several copper sheets, and the through holes of any two adjacent copper sheets are staggered.

[0014] Furthermore, the crushing knife group is a conical spiral blade, and the conical spiral blade gradually becomes smaller from top to bottom; the anti-blocking component is a spiral blade, and the spiral blade is sleeved on a hollow cylinder placed in the buffer chamber.

[0015] Furthermore, the stirring knife group includes a long stirring knife and a short stirring knife, the long stirring knife is located 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 and the short stirring knife are detachably connected, and the shapes of the long stirring knife and the short stirring knife are both boss-shaped; the long stirring knife and the short stirring knife are both evenly provided with constant pressure holes through the upper and lower ends, the connecting pipe is arranged inside the long stirring knife and the connecting pipe is evenly connected with the same number of one-way valves as the air distribution holes, the gas direction of the one-way valve flows from the inner cavity of the connecting pipe to the outer end, the one-way valve is assembled and connected to the corresponding air distribution hole, the constant pressure hole corresponds to the air distribution hole one by one and is spatially connected.

[0016] Furthermore, a reciprocating motion component is provided at the connection between the long stirring blade and the short stirring blade, and the long stirring blade and the short stirring blade are slidably assembled through a T-slot and a T-block, the length of the T-block is smaller than the length of the T-slot, a reciprocating motion component is fixed on the inner side of the T-slot and the extension direction of the output end of the reciprocating motion component is consistent with the length direction of the T-slot, and the output end of the reciprocating motion component is connected to the sliding end of the T-block placed in the T-slot.

[0017] Furthermore, the inner wall of the cylinder is provided with annular protrusions having the same number as the stirring blade group.

[0018] Furthermore, a filter screen is provided on one side of the air outlet pipe close to the inner cavity of the cylinder.

[0019] The beneficial effects of the present invention are:

[0020] Compared with the prior art, the preparation method of the present invention has higher coercive force and compressive strength, remanence (Br) and magnetic energy product (BH) max; at the same time, the raw material components in the present invention are necessary for the composite rare earth permanent magnet material to achieve its excellent performance. Once one of the components is missing, the performance of the composite rare earth permanent magnet material will be reduced.

[0021] The present invention is reasonably designed and solves the problem that the existing method for powder making and mixing is carried out in two steps, which leads to time-consuming, labor-intensive and cost-consuming problems. The existing technology is easy to discharge a large amount of inert gas into the air, which wastes resources and easily affects the environment. At the same time, the air in the powder making and mixing process is not completely removed, resulting in low anti-oxidation efficiency.

[0022] In the present invention, the anti-oxidation mixing equipment effectively combines the stirring knife group and the crushing knife group, so that the entire cylinder body can realize continuous operation from top to bottom, and has the advantages of uniform stirring and thorough crushing of the mixed raw materials and high production efficiency.

[0023] In the present invention, the anti-blocking component is arranged to facilitate the mixed raw materials in the cylinder to be brought out during the continuous rotation of the rotary blades, thereby preventing the mixed raw materials at the lower end from agglomerating due to the extrusion of the mixed raw materials at the upper end, thereby preventing the discharge pipe from being blocked.

[0024] In the present invention, by arranging the constant water pressure and the air distribution holes to cooperate with each other, when the mixed raw materials pass through the constant pressure holes, the inert gas passing through the air distribution holes can fully and effectively drive away the air mixed in the mixed raw materials, prevent the oxygen in the air from oxidizing the mixed raw materials, and improve the anti-oxidation efficiency.

[0025] In the present invention, a reciprocating motion component is provided to make the long stirring blade and the short stirring blade move relative to each other, thereby ensuring that different centrifugal forces are generated inside the cylinder, thereby making the turbulence intensity of the mixed raw materials at different positions in the cylinder different, thereby improving the stirring effect.

[0026] The use principle of the anti-oxidation mixing equipment of the present invention is as follows: when in use, first, start the electric circulation pump, and the air inside the cylinder is discharged from the air outlet pipe at the upper end of the cylinder. Due to the presence of the copper sheet in the air outlet pipe, it is fully and effectively guaranteed that the oxygen in the air reacts with the copper sheet to form copper oxide, thereby achieving the removal of oxygen. The air after passing through the copper sheet is introduced into the inner cavity of the hollow cylinder through the circulation air pipe. Since the air in the hollow cylinder is continuously gathered, the air in the hollow cylinder is pushed out into the cylinder, and this process is repeated until the oxygen content inside the cylinder reaches below 0.1%. Then, inert gas is added to the cylinder through the inflation pipe to restore the pressure inside the cylinder to normal pressure. Then, a process for preparing a composite rare earth permanent magnet material is completed. Finally, the discharge port of the hydrogen crushing device is connected with the material guide pipe of the present invention, the mixed raw material is poured into the cylinder, and the driving motor is started at the same time. The driving motor drives the stirring knife group and the crushing knife group to rotate in turn. The stirring knife group effectively realizes the stirring effect on the mixed raw material under the mutual cooperation of the long and short stirring knives, and the crushing knife group effectively realizes the crushing effect on the mixed raw material. At this time, the dynamic circulation pump is still working to make the inert gas in the hollow cylinder circulate. When the mixed raw material passes through the constant pressure hole, the inert gas passing through the air distribution hole can fully and effectively drive away the air doped in the mixed raw material, prevent the oxygen in the air from oxidizing with the mixed raw material, and improve the anti-oxidation efficiency. At the same time, the residual air removes the oxygen when it contacts the copper sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the front-end three-dimensional structure of the anti-oxidation mixing equipment.

[0028] Figure 2 It is a schematic diagram of the upper three-dimensional structure of the anti-oxidation mixing equipment.

[0029] Figure 3 It is a schematic diagram of the cross-sectional structure of the anti-oxidation mixing equipment.

[0030] Figure 4 It is a partial structural diagram of the exhaust pipe and internal structure.

[0031] Figure 5 It is a schematic diagram of the local assembly structure inside the cylinder.

[0032] Figure 6 It is a schematic diagram of the three-dimensional structure of the mixing knife group.

[0033] Figure 7 It is a schematic diagram of the partial three-dimensional structure of the anti-oxidation mixing equipment.

[0034] In the figure: cylinder 1, cylinder cover 2, material guide pipe 3, air outlet pipe 4, inflation pipe 5, copper sheet 6, buffer chamber 7, material outlet pipe 8, hollow cylinder 9, drive motor 10, circulating air pipe 11, electric circulating pump 12, sieve plate 13, stirring knife group 14, long stirring knife 14-1, short stirring knife 14-2, air distribution hole 15, connecting pipe 16, conical spiral sheet 17, spiral blade 18, constant pressure hole 19, one-way valve 20, reciprocating motion component 21, annular protrusion 22, filter screen 23. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0036] Embodiment 1:

[0037] A method for preparing a composite rare earth permanent magnetic material comprises the following steps:

[0038] Step 1, ingredients, a composite rare earth permanent magnet material includes the following raw materials in weight percentage: 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 acrylate resin, 6% of polyethylene 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;

[0039] Step 2, smelting: the prepared materials are respectively cast into sheets or ingots through a large furnace and a small furnace;

[0040] Step 3, hydrogen crushing: using the hydrogen absorption properties of rare earth metal compounds, the rare earth alloys are fused in a hydrogen environment;

[0041] Step 4, powder making and mixing: powder making and mixing are performed using anti-oxidation mixing equipment;

[0042] Step 5, molding: Select the corresponding mold according to the requirements and press the mixed fine powder into the required shape.

[0043] Example 2

[0044] A method for preparing a composite rare earth permanent magnetic material comprises the following steps:

[0045] Step 1, ingredients, a composite rare earth permanent magnet material includes the following raw materials in weight percentage: 50% neodymium iron boron magnetic powder, 22% ferrite magnetic powder, 4% samarium cobalt magnetic powder, 4% aluminum nickel cobalt magnetic powder, 0.7% polytetrafluoroethylene, 0.3% potassium sorbate, 8.5% acrylate resin, 6% polyethylene terephthalate-1,4-cyclohexanedimethanol ester, 1.6% silane coupling agent, 1.3% titanate coupling agent, 0.8% graphite, and 0.8% barium stearate;

[0046] Step 2, smelting: the prepared materials are respectively cast into sheets or ingots through a large furnace and a small furnace;

[0047] Step 3, hydrogen crushing: using the hydrogen absorption properties of rare earth metal compounds, the rare earth alloys are fused in a hydrogen environment;

[0048] Step 4, powder making and mixing: powder making and mixing are performed using anti-oxidation mixing equipment;

[0049] Step 5, molding: Select the corresponding mold according to the requirements and press the mixed fine powder into the required shape.

[0050] Embodiment 3:

[0051] A method for preparing a composite rare earth permanent magnetic material comprises the following steps:

[0052] Step 1, ingredients, a composite rare earth permanent magnet material includes the following raw materials in weight percentage: 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 acrylate resin, 7.5% of polyethylene terephthalate-1,4-cyclohexanedimethanol, 1.7% of silane coupling agent, 1.3% of titanate coupling agent, 0.3% of graphite, and 0.5% of barium stearate;

[0053] Step 2, smelting: the prepared materials are respectively cast into sheets or ingots through a large furnace and a small furnace;

[0054] Step 3, hydrogen crushing: using the hydrogen absorption properties of rare earth metal compounds, the rare earth alloys are fused in a hydrogen environment;

[0055] Step 4, powder making and mixing: powder making and mixing are performed using anti-oxidation mixing equipment;

[0056] Step 5, molding: Select the corresponding mold according to the requirements and press the mixed fine powder into the required shape.

[0057] Comparative Example 1:

[0058] A composite rare earth permanent magnet 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 acrylic resin, 6% of polyethylene terephthalate-1,4-cyclohexanedimethanol, 1.6% of silane coupling agent, 1.3% of titanate coupling agent, 0.7% of graphite and 0.5% of barium stearate.

[0059] Comparative Example 2:

[0060] A composite rare earth permanent magnet 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 acrylic resin, 6% of polyethylene terephthalate-1,4-cyclohexanedimethanol, 1.6% of silane coupling agent, 1.3% of titanate coupling agent, 0.7% of graphite and 0.5% of barium stearate.

[0061] Comparative Example 3:

[0062] A composite rare earth permanent magnet 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 terephthalate-1,4-cyclohexanedimethanol, 1.6% of silane coupling agent, 1.3% of titanate coupling agent, 0.7% of graphite and 0.5% of barium stearate.

[0063] Comparative Example 4:

[0064] A composite rare earth permanent magnet 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.

[0065] Comparative Example 5:

[0066] A composite rare earth permanent magnet 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, 6% of polyethylene terephthalate-1,4-cyclohexanedimethanol, 2.9% of silane coupling agent, 0.7% of graphite and 0.5% of barium stearate.

[0067] The magnetic properties and mechanical properties of Examples 1-3 and Comparative Examples 1-6 were measured respectively, and the results are shown in the following table.

[0068]

[0069] It can be concluded from Table 1 that the composite rare earth permanent magnet material of the present invention has higher coercive force and compressive strength, remanence (Br) and magnetic energy product (BH)max; at the same time, the raw material components in the present invention are necessary for the composite rare earth permanent magnet material to achieve its excellent performance. Once one of the components is missing, the performance of the composite rare earth permanent magnet material will be reduced. After omitting one component in the above comparative examples 1-6 respectively, all indicators will decrease, which fully verifies that the raw material components in the present invention can only achieve their performance when they cooperate with each other.

[0070] Embodiment 4:

[0071] Combination Figures 1 to 7As shown, the anti-oxidation mixing equipment includes a cylinder 1, the upper end of the cylinder 1 is sealed with a cylinder cover 2, the upper end of the cylinder cover 2 is sequentially provided with a material guide pipe 3, an air outlet pipe 4, and an air charging pipe 5, and the air outlet pipe 4 is provided with a plurality of copper sheets 6. In this embodiment, the copper sheets 6 are plate-like structures with through holes, and the number thereof is 2, and the through holes of any two adjacent copper sheets 6 are staggered. The staggered through holes prevent the air entering the air outlet pipe 4 from forming a straight airflow, so as to achieve the effect of disturbing the air, thereby fully and effectively ensuring that the oxygen in the air reacts with the copper sheets 6 to form copper oxide, and realizing the oxygen The cylinder 1 is removed, and a buffer chamber 7 is integrally formed at the conical end at the bottom of the cylinder 1. The buffer chamber 7 reserves space for the subsequent installation of an anti-blocking component inside it, and at the same time increases the storage space for the composite rare earth permanent magnet raw material to a certain extent. The side end of the buffer chamber 7 is connected through a discharge pipe 8; a hollow cylinder 9 is vertically and concentrically arranged inside the cylinder 1, and the upper end of the hollow cylinder 9 is rotatably connected to the cylinder cover 2 through a sealed bearing. A drive motor 10 is fixedly connected to the upper end of the cylinder 1 through a machine base, and the output shaft of the drive motor 10 rotates in a sealed manner through the center of the upper end of the cylinder 1 and is connected to the upper end of the hollow cylinder 9 through a sealed bearing. The drive motor The machine 10 is electrically connected to the power generation device (the power generation device can be a generator or a battery, etc., and the present embodiment adopts a battery. The battery is a prior art and will not be described here, and is not shown in the figure). The lower end of the hollow cylinder 9 is rotatably connected to the lower end of the buffer chamber 7 through a sealed bearing. One end of the circulating air pipe 11 is sealed and penetrates the lower end of the buffer chamber 7 and the lower end of the hollow cylinder 9 in sequence and is transferred to the hollow cylinder 9 through a sealed bearing. The other end of the circulating air pipe 11 is sealed and penetrates the end cover on the outlet pipe 4, and the end cover is threadedly connected to the outlet pipe 4. The circulating air pipe 11 is provided with an electric circulating pump 12 (brand: CZTRYQ, model : RS), the electric circulation pump 12 is electrically connected to the battery; a sieve plate 13 is movably sleeved in the middle of the outer wall of the hollow cylinder 9, and the side wall of the sieve plate 13 is fixedly connected to the side wall of the cylinder 1. A plurality of stirring knife groups 14 are fixedly arranged on the side wall of the hollow cylinder 9 at the upper end of the sieve plate 13 from top to bottom in equidistant order. The stirring knife group 14 can effectively mix the mixed raw materials. In this embodiment, three stirring knife groups 14 are used, and a plurality of air distribution holes 15 are arranged on the stirring knife group 14. The air distribution holes 15 are connected to the connecting pipe 16 provided in the stirring knife group 14, and the other end of the connecting pipe 16 is connected to the inner cavity of the hollow cylinder 9;The hollow cylinder 9 at the lower end of the sieve plate 13 is equipped with a crushing knife group. In this embodiment, the crushing knife group is a conical spiral blade 17, which gradually becomes smaller from top to bottom. The installation of the crushing knife group can further crush the raw materials passing through the sieve plate 13, so as to fully crush the mixed raw materials. An anti-blocking component is installed on the hollow cylinder 9 placed in the buffer chamber 7. In this embodiment, the anti-blocking component is a spiral blade 18, which is sleeved on the hollow cylinder 9 placed in the buffer chamber 7. The anti-blocking component is arranged to facilitate the mixed raw materials in the cylinder 1 to be brought out during the continuous rotation of the rotary blade, so as to avoid the agglomeration of the mixed raw materials at the lower end due to the extrusion of the mixed raw materials at the upper end, thereby blocking the discharge pipe 8. ;

[0072] With the aid of the above technical solution, the anti-oxidation mixing equipment effectively combines the stirring knife group 14 and the crushing knife group, so that the entire cylinder 1 can be continuously operated from top to bottom, which has the advantages of uniform stirring and thorough crushing of the mixed raw materials and high production efficiency.

[0073] As a preferred embodiment, the stirring blade group 14 includes a long stirring blade 14-1 and a short stirring blade 14-2. The long stirring blade 14-1 is located above the short stirring blade 14-2. The length of the long stirring blade 14-1 is greater than that of the short stirring blade 14-2. The long stirring blade 14-1 and the short stirring blade 14-2 are arranged in an inconsistent length to ensure that they generate centrifugal forces of different sizes during stirring, so that the turbulent intensities of the mixed raw materials at different positions in the cylinder 1 are different, thereby enhancing the stirring effect. The long stirring blade 14-1 and the short stirring blade 14-2 are detachably connected to facilitate the subsequent replacement and maintenance of the short stirring blade 14-2. The shapes of the long stirring blade 14-1 and the short stirring blade 14-2 are both boss-shaped, thereby enhancing the cutting effect of the long stirring blade 14-1 and the short stirring blade 14-2 on the mixed raw materials; constant pressure holes 19 are evenly distributed through the upper and lower ends of the long stirring blade 14-1 and the short stirring blade 14-2 to ensure that the mixed raw materials pass through When passing through the constant pressure hole 19, the pressures at the upper and lower ends of the long stirring blade 14-1 and the short stirring blade 14-2 are the same, thereby preventing the mixed raw materials from adhering to the long stirring blade 14-1 and the short stirring blade 14-2; the connecting pipe 16 is arranged in a through manner inside the long stirring blade 14-1, and the connecting pipe 16 is evenly connected with the same number of one-way valves 20 as the air distribution holes 15, and the gas direction of the one-way valve 20 flows from the inner cavity of the connecting pipe 16 to the outer end, and the one-way valve 20 is assembled and connected with the corresponding air distribution holes 15; the vertically arranged constant pressure holes on the long stirring blade 14-1 correspond to the horizontally arranged air distribution holes 15 on the long stirring blade 14-1 one by one and are spatially connected. By setting the constant water pressure and the air distribution holes 15 to cooperate with each other, when the mixed raw materials pass through the constant pressure hole 19, the inert gas passing through the air distribution holes 15 can fully and effectively drive away the air mixed in the mixed raw materials, prevent the oxygen in the air from oxidizing with the mixed raw materials, and improve the anti-oxidation efficiency.

[0074] As a preferred embodiment, in order to make the long stirring blade 14-1 and the short stirring blade 14-2 move relative to each other, a reciprocating motion component 21 is provided at the connection between the long stirring blade 14-1 and the short stirring blade 14-2. In this embodiment, the reciprocating motion component 21 is an electric telescopic rod (the electric telescopic rod is a prior art and will not be described here), the electric telescopic rod is electrically connected to the battery, the long stirring blade 14-1 and the short stirring blade 14-2 are slidably assembled through a T-slot and a T-block, the length of the T-block is less than the length of the T-slot, the electric telescopic rod is fixed inside the T-slot and the extension direction of the output end of the electric telescopic rod is consistent with the length direction of the T-slot, and the output end of the electric telescopic rod is connected to the sliding end of the T-block placed in the T-slot. The long stirring blade 14-1 and the short stirring blade 14-2 that move relative to each other further ensure that different centrifugal forces are generated inside the cylinder 1, thereby making the turbulence intensity of the mixed raw materials at different positions in the cylinder 1 different, thereby improving the stirring effect.

[0075] As a preferred embodiment, annular protrusions 22 having the same number as the stirring blade set 14 are welded on the inner wall of the cylinder 1 . The annular protrusions 22 make the mixed raw materials at different positions in the cylinder 1 different, and can also improve the turbulence intensity difference effect in the cylinder 1 .

[0076] As a preferred embodiment, the drive motor 10, the electric telescopic rod, and the electric circulation pump 12 are electrically connected to a control panel, and the control panel is electrically connected to the battery (the control panel is prior art and is not described here and is not shown in the figure).

[0077] As a preferred embodiment, a filter screen 23 is provided on the side of the air outlet pipe 4 close to the inner cavity of the cylinder 1, and the filter screen 23 is provided to prevent the mixed raw materials inside the cylinder 1 from being sucked into the cylinder 1 during the air extraction process.

[0078] With the aid of the above technical scheme, the use principle of the anti-oxidation mixing equipment of the present invention is as follows: when in use, first, start the electric circulation pump 12, and the air inside the cylinder 1 is discharged from the air outlet pipe 4 at the upper end of the cylinder 1. Due to the presence of the copper sheet 6 in the air outlet pipe 4, it is fully and effectively guaranteed that the oxygen in the air reacts with the copper sheet 6 to form copper oxide, thereby achieving the removal of oxygen. The air after passing through the copper sheet 6 is introduced into the inner cavity of the hollow cylinder 9 through the circulation air pipe 11. Since the air in the hollow cylinder is constantly gathered, the air in the hollow cylinder is pushed out into the cylinder 1, and the cycle is repeated until the oxygen content in the cylinder 1 reaches below 0.1%, and then the inert gas is added to the cylinder 1 through the inflation pipe 5 to restore the pressure in the cylinder 1 to normal pressure; then, in the preparation of a composite rare earth permanent magnet material, After the process is completed, the discharge port of the hydrogen crushing device is connected to the material guide pipe 3 of the present invention, and the mixed raw material is poured into the cylinder 1. At the same time, the drive motor 10 is started. The drive motor 10 drives the stirring knife group 14 and the crushing knife group to rotate in turn. The stirring knife group 14 effectively realizes the stirring effect on the mixed raw material under the mutual cooperation of the long and short stirring knives 14-2, and the crushing knife group effectively realizes the crushing effect on the mixed raw material. At this time, the dynamic circulation pump is still working to circulate the inert gas in the hollow cylinder 9. When the mixed raw material passes through the constant pressure hole 19, the inert gas passing through the air distribution hole 15 can fully and effectively drive away the air doped in the mixed raw material, prevent the oxygen in the air from oxidizing with the mixed raw material, and improve the anti-oxidation efficiency. At the same time, the residual air removes oxygen when it contacts the copper sheet 6.

[0079] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An anti-oxidation mixing device, characterized in that: It comprises a cylinder body, the upper end of which is provided with a cylinder cover, and the upper end of which is provided with a material guide pipe, an air outlet pipe and an air charging pipe in sequence, and a plurality of copper sheets are provided in the air outlet pipe, and the conical end at the bottom of the cylinder body is integrally formed with a buffer cavity, and the side end of the buffer cavity is connected with the material outlet pipe through and through; a hollow cylinder is vertically and concentrically provided inside the cylinder body, and the upper and lower ends of the hollow cylinder are rotatably connected with the cylinder cover and the buffer cavity respectively, and the output shaft of the driving motor at the upper end of the cylinder body rotates through the cylinder body and is connected with the upper end of the hollow cylinder; one end of the circulating air pipe passes through the lower end of the buffer cavity and is connected with the bottom end of the hollow cylinder and transferred, and the circulating air pipe is connected with the lower end of the hollow cylinder through the lower end of the buffer cavity, and the circulating air pipe is connected with the lower end of the hollow cylinder through the lower end of the buffer cavity, and the circulating air pipe is connected with the lower end of the hollow cylinder through the lower end of the buffer cavity, and the circulating air pipe is connected with the lower end of the hollow cylinder through the lower end of the buffer cavity, and the circulating air pipe is connected with the lower end of the hollow cylinder through the lower end of the buffer cavity through ... The other end of the air pipe is connected to the air outlet pipe, and an electric circulating pump is provided on the circulating air pipe; a sieve plate is movably sleeved on the middle position of the outer wall of the hollow cylinder, and the side wall of the sieve plate is fixedly connected to the side wall of the cylinder; a number of stirring knife groups are fixedly arranged on the side wall of the hollow cylinder at the upper end of the sieve plate in equidistant order from top to bottom, and a number of air distribution holes are provided on the stirring knife group, and the air distribution holes are connected to the connecting pipe provided in the stirring knife group, and the other end of the connecting pipe is connected to the inner cavity of the hollow cylinder; a crushing knife group is installed on the hollow cylinder at the lower end of the sieve plate, and an anti-blocking component is provided on the hollow cylinder placed in the buffer cavity.

2. The anti-oxidation mixing equipment according to claim 1, characterized in that: The copper sheets are plate-like structures with through holes, and there are several copper sheets, and the through holes of any two adjacent copper sheets are staggered.

3. The anti-oxidation mixing equipment according to claim 1, characterized in that: The crushing knife group is a conical spiral blade, and the conical spiral blade gradually becomes smaller from top to bottom; the anti-blocking component is a spiral blade, and the spiral blade is sleeved on a hollow cylinder placed in the buffer chamber.

4. The anti-oxidation mixing equipment according to claim 1, characterized in that: The stirring knife group includes a long stirring knife and a short stirring knife, the long stirring knife is located 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 and the short stirring knife are detachably connected, and the shapes of the long stirring knife and the short stirring knife are both boss-shaped; the long stirring knife and the short stirring knife are both evenly provided with constant pressure holes through the upper and lower ends, the connecting pipe is arranged inside the long stirring knife and the connecting pipe is evenly connected with the same number of one-way valves as the air distribution holes, the gas direction of the one-way valve flows from the inner cavity of the connecting pipe to the outer end, the one-way valve is assembled and connected with the corresponding air distribution hole, the constant pressure hole corresponds to the air distribution hole one by one and is spatially connected.

5. The anti-oxidation mixing equipment according to claim 4, characterized in that: A reciprocating motion component is provided at the connection between the long stirring blade and the short stirring blade. The long stirring blade and the short stirring blade are slidably assembled through a T-slot and a T-block. The length of the T-block is smaller than the length of the T-slot. A reciprocating motion component is fixed on the inner side of the T-slot and the extension direction of the output end of the reciprocating motion component is consistent with the length direction of the T-slot. The output end of the reciprocating motion component is connected to the sliding end of the T-block placed in the T-slot.

6. The anti-oxidation mixing equipment according to claim 1, characterized in that: The inner wall of the cylinder is fixedly provided with annular protrusions having the same number as the stirring blade groups.

7. The anti-oxidation mixing equipment according to claim 1, characterized in that: A filter screen is arranged on one side of the air outlet pipe close to the inner cavity of the cylinder.

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