NdFeB powder metallurgy mixing equipment and method

Abstract

The present invention relates to a NdFeB powder metallurgy mixing device and method, and to the technical field of powder metallurgy; it includes a mixing tank, a conical block is installed at the upper end of the mixing tank, a mixing device for mixing NdFeB powder is arranged below the conical block inside the mixing tank, the mixing device includes a feed block equidistantly installed inside the mixing tank along the height direction of the mixing tank, the feed block is rotatably arranged inside the mixing tank, a fixed pipe is installed inside the mixing tank below a plurality of feed blocks, and a receiving plate is rotatably arranged below a plurality of fixed pipes. The present invention can solve the following problems existing in the prior art in the process of powder metallurgy: the feed plate is driven by a driving shaft to transport the NdFeB powder to the receiving plate, so as to ensure that the powder is evenly distributed in the mixing device, and avoid the agglomeration phenomenon caused by a large amount of one-time addition. Secondly, by setting a first feed plate, a second feed plate and a third feed plate, in the process of discharging, the inert gas inside the mixing tank is prevented from synchronously overflowing.

Description

Technical Field

[0001] The invention relates to the technical field of powder metallurgy, and in particular to a NdFeB powder metallurgy mixing device and method. Background Art

[0002] NdFeB permanent magnet materials are widely used in motors, electronic equipment, medical devices, industrial equipment and other fields due to their high magnetic energy product and strong magnetism. Its preparation process mainly includes alloy smelting, powder making, powder mixing, pressing and sintering. Among them, powder mixing is the key link, which directly affects the magnetic properties and consistency of the final product.

[0003] Traditional mixing methods such as mechanical stirring and air flow mixing have problems such as uneven mixing, easy oxidation, and low efficiency. Therefore, it is of great significance to develop an efficient, uniform and anti-oxidation NdFeB powder metallurgy mixing equipment.

[0004] For example, Chinese patent publication number CN220310230U discloses a NdFeB powder stirring mixer, which stirs more evenly and has more stable quality during use; it has high stirring efficiency and short stirring time, greatly improving production efficiency and being more economical; the magnetic powder is stirred at low temperature and in a short time, so it is not easy to oxidize and has higher quality.

[0005] However, the above-mentioned NdFeB powder mixing machine still has some shortcomings in actual use: 1. The above device can pre-treat and filter the powder, but it cannot break up the lumps produced during the mixing process, and cannot effectively prevent the uneven mixing of NdFeB powder, which will lead to uneven density distribution of subsequent pressed parts, affecting their mechanical properties and dimensional accuracy.

[0006] 2. The device has multiple air jets on the side wall of the mixing drum, and the other end of the split air inlet pipe is connected to and connected to the air jet. When in use, the mixing is more uniform and the quality is more stable. However, if the pressure of the jet, the duration of the jet and the interval between the opening and closing of the nozzle are not properly controlled, the powder may be unevenly mixed, affecting the quality of the final product. In addition, since the mixing object is in powder form, the raised powder may clog the air jet, affecting the working efficiency of the air jet.

[0007] Therefore, under the above-mentioned viewpoints, it is of great significance to improve and perfect the NdFeB powder stirring mixer, which can not only effectively prevent agglomeration during the mixing process, but also utilize other stirring methods to solve the drawbacks of using jet stirring. Summary of the invention

[0008] In order to solve the above problems, the present invention provides a NdFeB powder metallurgy mixing device and method.

[0009] On the one hand, a NdFeB powder metallurgy mixing equipment comprises a mixing tank, wherein a conical block is installed at the upper end of the mixing tank, and a mixing device for mixing NdFeB powder is arranged below the conical block inside the mixing tank, and the mixing device comprises feeding blocks equidistantly installed inside the mixing tank along the height direction of the mixing tank, and the feeding blocks are rotatably arranged inside the mixing tank, and fixed pipes are installed inside the mixing tank below a plurality of the feeding blocks, and receiving plates are rotatably arranged below a plurality of the fixed pipes.

[0010] The interior of the mixing tank is filled with an inert gas to prevent the NdFeB powder from being oxidized.

[0011] The receiving plate is provided with a mixing mechanism for mixing the NdFeB powder conveyed by the feeding block.

[0012] Preferably, spiral grooves are provided on the sides of the plurality of feeding blocks, the receiving plate contacts the feeding block below it, and the receiving plate is provided with a conveying groove which is connected with the spiral grooves on the adjacent feeding blocks.

[0013] Preferably, a through slot penetrating the fixed tube is provided inside the feeding block, a connecting rod is provided inside the through slot, a driving shaft is rotatably provided inside the plurality of fixed tubes through the connecting rod, and two adjacent driving shafts are connected via a transmission.

[0014] Preferably, the mixing mechanism comprises a mixing shaft rotatably arranged on a fixed tube equidistantly along the axis of the driving shaft, one end of the mixing shaft passes through a fixed tube and is arranged above a receiving plate, and a plurality of mixing plates are installed equidistantly along the axis of the mixing shaft at one end above the receiving plate.

[0015] Preferably, the receiving plate and the feeding block are provided with matching parts, and the matching parts include an arc-shaped plate, and the arc-shaped plate is slidably arranged inside the conveying trough by a spring, and a push plate is slidably arranged on the top of the feeding block along its height direction by a push spring, and a spring rod is installed at one end of the arc-shaped plate close to the feeding block, and the push plate is movably in contact with the spring rod.

[0016] Preferably, a vibrator for driving the conical block to vibrate is arranged inside the mixing tank, and the vibrator includes a fixing ring. A working groove connected to the through groove is opened inside the conical block, and the fixing ring is arranged inside the working groove and installed on the inner wall of the through groove.

[0017] Preferably, a plurality of connecting ropes are arranged between the fixing ring and the inner wall of the through groove along the axis of the fixing ring, a striking ball is slidably arranged on the connecting rope, a winding roller is sleeved on the driving shaft inside the fixing ring, a plurality of pull ropes are wound around the winding roller, and the other end of the pull rope is connected to the striking ball.

[0018] Preferably, a receiving groove is provided on the driving shaft, a triangular block is slidably arranged in the receiving groove via a spring, and a matching groove is provided on the inner wall of the winding roller, and the matching groove is movably engaged with the triangular block.

[0019] Preferably, a square feeding pipe is installed at the bottom of the mixing tank, and a first feeding plate, a second feeding plate and a third feeding plate are slidably arranged inside the feeding pipe, and the first feeding plate and the third feeding plate are connected by a sliding rod.

[0020] A push-pull plate is slidably arranged inside the feeding tube between the second feeding plate and the third feeding plate via a tension spring, and an end of the third feeding plate away from the slide rod and an end of the push-pull plate close to the third feeding plate are both installed with electromagnets.

[0021] On the other hand, a NdFeB powder metallurgy mixing method, the mixing method is as follows: S1. Powder feeding: The NdFeB powder entering the mixing tank falls on the conical block; S2, Rotation feeding: The driving shaft rotates, driving the striking ball to knock the conical block, and then the lactoferrin powder enters the spiral groove on the feeding block under vibration; S3, mixing and stirring: the driving shaft drives the feeding block to rotate, and the NdFeB powder is moved to the receiving plate through the feeding block. At the same time, the mixing shaft rotates and drives the mixing plate to scoop up the NdFeB powder on the receiving plate, and the NdFeB powder is mixed by cooperating with the receiving plate; S4. Discharging is completed: the NdFeB powder after mixing is collected by falling through the feeding pipe.

[0022] In summary, the present application includes at least one of the following beneficial technical effects: 1. The present invention provides a feeding plate, a receiving plate and a driving shaft, and drives the feeding plate to convey the NdFeB powder to the receiving plate through the driving shaft, and gradually discharges the powder to ensure that the powder is evenly distributed in the mixing device, avoiding local accumulation or agglomeration caused by adding a large amount at one time. By gradually adding, the powder has enough time to fully flow and disperse in the mixing device, thereby improving the uniformity of mixing.

[0023] 2. The present invention sets a transmission so that the rotation of multiple drive shafts gradually increases from top to bottom, and the NdFeB powder entering the mixing tank is graded and stirred, and the stirring speed gradually increases from top to bottom, thereby reducing electrostatic adsorption and van der Waals force between powders, and preventing powder sintering caused by local overheating, ultimately achieving high-quality mixing of NdFeB powder, and laying a good foundation for subsequent molding and sintering processes.

[0024] 3. The present invention prevents the inert gas inside the mixing tank from synchronously overflowing during the discharging process by setting the first feeding plate, the second feeding plate and the third feeding plate, and exchanges with the air outside the mixing tank to prevent the NdFeB powder from being oxidized, thereby ensuring the molding quality and dimensional accuracy of the material.

[0025] Fourth, the present invention limits the shape of the mixing plate, and continuously controls the falling position of the NdFeB powder during the mixing process on the receiving plate, which cooperates with the rotating receiving plate to improve the stirring and mixing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0028] Figure 2 It is a schematic diagram of the structure inside the mixing tank of the present invention.

[0029] Figure 3 It is a schematic structural diagram of the mixing device of the present invention.

[0030] Figure 4 It is a schematic diagram of the structure inside the feeding block of the present invention.

[0031] Figure 5 The present invention Figure 4 Schematic diagram of the structure at A in the middle.

[0032] Figure 6 It is a structural schematic diagram of the mixing mechanism of the present invention.

[0033] Figure 7 It is a structural schematic diagram of the matching part of the present invention.

[0034] Figure 8 The present invention Figure 7 Schematic diagram of the structure at B in the figure.

[0035] Fig. 9 It is a schematic structural diagram of the vibration component of the present invention.

[0036] Fig.10 It is a schematic diagram of the position of the triangular block of the present invention.

[0037] Fig.11 It is a schematic diagram of the structure inside the feeding tube of the present invention.

[0038] Fig.12 It is a schematic diagram of the structure of the outside of the feeding tube of the present invention.

[0039] In the figure, 1, mixing tank; 10, conical block; 2, mixing device; 20, feeding block; 21, fixed pipe; 22, receiving plate; 30, spiral groove; 31, conveying groove; 4, mixing mechanism; 40, mixing shaft; 41, mixing plate; 50, through groove; 51, connecting rod; 52, driving shaft; 53, transmission; 6, driving member; 60, driving gear ring; 61, driving gear; 7, vibrating member; 70, fixed ring; 71, annular block; 72, collecting Groove; 73, triangular block; 74, connecting rope; 75, hitting ball; 76, winding roller; 77, pull rope; 80, feeding tube; 81, first feeding plate; 82, second feeding plate; 83, third feeding plate; 84, sliding rod; 85, push-pull plate; 86, electromagnet; 9, matching part; 90, arc plate; 91, push plate; 92, spring rod; 110, first screw; 111, second screw; 112, synchronous wheel; 113, synchronous belt. DETAILED DESCRIPTION

[0040] The following is combined with Figure 1-Figure 12 Embodiments of the present invention are described in detail.

[0041] The embodiment of the present application discloses a NdFeB powder metallurgy mixing device and method, which illustrates that the present application is mainly used in the process of powder metallurgy, and can technically avoid the problem of uneven mixing caused by agglomeration during the mixing of NdFeB powder, thereby causing uneven distribution of bond density in subsequent pressing; further, it can also solve the problem of insufficient mixing of NdFeB powder due to a single mixing method during the mixing process.

[0042] Embodiment 1: Reference Figure 1 , Figure 2 and Figure 3 As shown, it includes a mixing tank 1, a conical block 10 is installed on the upper end of the mixing tank 1, a mixing device 2 for mixing NdFeB powder is arranged below the conical block 10 inside the mixing tank 1, the mixing device 2 includes feeding blocks 20 installed inside the mixing tank 1 at equal distances along the height direction of the mixing tank 1, the feeding blocks 20 are rotatably arranged inside the mixing tank 1, a plurality of fixed pipes 21 are installed inside the mixing tank 1 below the feeding blocks 20, and a receiving plate 22 is rotatably arranged below the plurality of fixed pipes 21.

[0043] A connecting pipe connected to the interior of the mixing tank 1 is installed at the upper end of the mixing tank 1. NdFeB powder is transported through the connecting pipe. The NdFeB powder enters the mixing tank 1 through the top of the mixing tank 1. The powder entering the mixing tank 1 slides to the side wall of the mixing tank 1 through the conical block 10, and the powder is transported to the receiving plate 22 below the feeding block 20 through the feeding block 20, and is stirred and mixed on the receiving plate 22.

[0044] The sides of the plurality of feeding blocks 20 are provided with spiral grooves 30, the receiving plate 22 is in conflict with the feeding block 20 below it, and the receiving plate 22 is provided with a conveying groove 31 connected with the spiral groove 30 on the adjacent feeding block 20. By driving the feeding block 20 to rotate, the NdFeB powder above the feeding block 20 will be conveyed to the receiving plate 22 below the feeding block 20 through the conveying groove 31 under the cooperation of the conveying groove 31 and the inner wall of the mixing tank 1. After the NdFeB powder is stirred and mixed on the receiving plate 22, it will enter the adjacent feeding block 20 through the conveying groove 31 on the receiving plate 22. In the spiral groove 30 on the material block 20, the material is transported to different receiving plates 22 through multiple feeding blocks 20 below. Through the different stirring rates on the receiving plates 22, the NdFeB powder entering the mixing tank 1 is graded and stirred, and the stirring speed gradually increases from top to bottom. The advantage of this setting is that it can prevent the sintering of powder caused by local overheating between the NdFeB powders, resulting in agglomeration, and then making the mixing effect of the NdFeB powder poor. By adopting a graded stirring process, the agglomeration phenomenon of the NdFeB powder during the mixing process can be effectively prevented, thereby significantly improving the mixing effect.

[0045] Specifically, graded stirring first uses low-speed stirring to initially disperse the NdFeB powder to prevent the powder from agglomerating due to high-speed impact; then gradually increases the stirring speed to ensure that powders of different particle sizes are fully mixed and evenly mixed. This staged and progressive stirring method can not only reduce the electrostatic adsorption and van der Waals force between powders, but also prevent powder sintering caused by local overheating, and ultimately achieve high-quality mixing of NdFeB powders, laying a good foundation for subsequent molding and sintering processes.

[0046] The mixing tank 1 is filled with an inert gas to prevent the NdFeB powder from oxidizing. The NdFeB powder is easily oxidized by oxygen in the air, resulting in the formation of oxides on the powder surface, which reduces its magnetic properties. Filling the mixing tank with an inert gas (such as nitrogen or argon) can effectively isolate oxygen, prevent the powder from oxidizing, and maintain its chemical stability and magnetic properties.

[0047] The receiving plate 22 is provided with a mixing mechanism 4 for mixing the NdFeB powder delivered by the feeding block 20 , and the NdFeB powder dropped onto the receiving plate 22 is mixed by the mixing mechanism 4 .

[0048] Reference Figure 3 and Figure 4 As shown, it is a schematic diagram of the structure for driving the feed block 20 to rotate; specifically, a through groove 50 is opened inside the feed block 20 and penetrates the fixed tube 21, a connecting rod 51 is arranged inside the through groove 50, and a driving shaft 52 is arranged inside the plurality of fixed tubes 21 for rotation via the connecting rod, and two adjacent driving shafts 52 are connected via a transmission 53.

[0049] By driving the driving shaft 52 at the bottom of the mixing tank 1 to rotate, the multiple feeding blocks 20 are driven to rotate, and the transmission 53 is used to drive the driving shaft 52 to rotate at different speeds. Then, the rotation speeds of the multiple feeding blocks 20 are different. The rotation speed increases from top to bottom. Then, in the mixing tank 1, the speed of the NdFeB powder transported by different feeding blocks 20 from top to bottom gradually increases.

[0050] Reference Figure 4 , Figure 5 and Figure 6 As shown, it is a schematic diagram of the structure for mixing the NdFeB powder on the receiving plate 22; specifically, the mixing mechanism 4 includes a mixing shaft 40 that is equidistantly rotated on the fixed tube 21 along the axis of the driving shaft 52, one end of the mixing shaft 40 passes through the fixed tube 21 and is arranged above the receiving plate 22, and a plurality of mixing plates 41 are installed equidistantly along its axis at one end of the mixing shaft 40 located above the receiving plate 22.

[0051] When the receiving plate 22 rotates clockwise, the mixing shaft 40 will rotate clockwise. When the NdFeB powder on the receiving plate 22 moves along with the receiving plate 22, the mixing plate 41 on the mixing shaft 40 will cooperate with the receiving plate 22 and shovel up the NdFeB powder on the receiving plate 22. The mixing shaft 40 rotates, and the mixing plate 41 on the mixing shaft 40 lifts up the NdFeB powder, thereby mixing the NdFeB powder.

[0052] Reference Figure 4 , Figure 5 and Figure 6 As shown, it is a schematic diagram of the structure that makes the mixing shaft 40 rotate; specifically, a plurality of fixed tubes 21 are each provided with a driving member 6 for driving the mixing shaft 40 to rotate, and the driving member 6 includes a driving gear ring 60, which is installed on a section of the driving shaft 52 corresponding to the fixed tube 21, and a driving gear 61 meshing with the driving gear ring 60 is installed at one end of the mixing shaft 40 located inside the fixed tube 21. When the driving shaft 52 rotates, the driving gear ring 60 on the driving shaft 52 will rotate synchronously, and the driving gear ring 60 will drive the driving gear 61 meshing with it to rotate synchronously, thereby driving the mixing shaft 40 to rotate.

[0053] Reference Figure 3 , Figure 7 and Figure 8 As shown, it is a schematic diagram of the structure for blocking the conveying trough 31; specifically, the receiving plate 22 and the feeding block 20 are provided with a matching piece 9, and the matching piece 9 includes an arc-shaped plate 90, and the arc-shaped plate 90 is slidably arranged inside the conveying trough 31 by a spring, and a push plate 91 is slidably arranged on the top of the feeding block 20 along its height direction by a push spring, and a spring rod 92 is installed at one end of the arc-shaped plate 90 close to the feeding block 20, and the push plate 91 is movably in contact with the spring rod 92.

[0054] Since the NdFeB powder on the receiving plate 22 can only fall into the spiral groove 30 for transportation when the conveying groove 31 on the receiving plate 22 overlaps with the spiral groove 30, when the conveying groove 31 and the spiral groove 30 do not overlap, the NdFeB powder may enter the conveying groove 31. Since the rotation speeds of the adjacent receiving plate 22 and the feeding block 20 are different, the NdFeB powder will pass through the conveying groove 31 and enter the gap between the receiving plate 22 and the feeding block 20, resulting in waste of raw materials. Therefore, when the conveying groove 31 and the spiral groove 30 do not overlap, the conveying groove 31 is blocked by the matching piece 9 to prevent the NdFeB powder from falling when the conveying groove 31 and the spiral groove 30 do not overlap.

[0055] When the push plate 91 on the feeding block 20 approaches the conveying trough 31, the push plate 91 will gradually push the arc plate 90 to slide, driving the conveying trough 31 to gradually open. At this time, the NdFeB powder on the receiving plate 22 will fall through the conveying trough 31. When the push plate 91 is about to move away from the conveying trough 31, the arc plate 90 slides to the bottom. When it cannot slide anymore, it will drive the push plate 91 to shrink in the reverse direction. At this time, the arc plate 90 returns to its initial state under the action of the spring, and blocks the conveying trough 31 until the conveying trough 31 overlaps with the spiral groove 30 again. This cycle is repeated to complete the conveying of the NdFeB powder on the receiving plate 22.

[0056] Reference Fig. 9 and Fig.10 As shown, that is, a schematic diagram of the structure for driving the conical block 10 to vibrate and discharge materials; specifically, a vibrating member 7 for driving the conical block 10 to vibrate is arranged inside the mixing tank 1, and the vibrating member 7 includes a fixing ring 70. A working groove connected to the through groove 50 is opened inside the conical block 10, and the fixing ring 70 is arranged inside the working groove, and the fixing ring 70 is installed on the inner wall of the through groove 50.

[0057] When the NdFeB powder enters the mixing tank 1 , it will be deposited on the conical block 10 . The vibrating member 7 drives the conical block 10 to vibrate, so that the deposited NdFeB powder can enter the spiral groove 30 .

[0058] An annular groove is formed on the feeding block 20 , and an annular block 71 is disposed at the bottom of the conical block 10 , and the annular block 71 is rotatably disposed inside the annular groove.

[0059] This allows the conical block 10 to generate a certain vibration effect on the feed block 20 during the vibration process, thereby improving the efficiency of the feed block 20 in rotating and feeding, and preventing the NdFeB powder from sticking to the spiral groove 30 .

[0060] Reference Fig. 9 and Fig.10As shown, that is, a schematic diagram of the structure of the vibrating member 7; specifically, a plurality of connecting ropes 74 are arranged along the axis of the fixing ring 70 between the fixing ring 70 and the inner wall of the through groove 50, a striking ball 75 is slidably arranged on the connecting rope 74, a winding roller 76 is sleeved on the driving shaft 52 inside the fixing ring 70, and the winding roller 76 is rotatably arranged inside the through groove 50 by a volute spring, a plurality of pull ropes 77 are wound around the winding roller 76, and the other end of the pull rope 77 is connected to the striking ball 75.

[0061] A receiving groove 72 is provided on the driving shaft 52 , and a triangular block 73 is slidably arranged in the receiving groove 72 via a spring. A matching groove is provided on the inner wall of the winding roller 76 , and the matching groove is movably engaged with the triangular block 73 .

[0062] When the drive shaft 52 rotates, the triangular block 73 on the drive shaft 52 and the matching groove on the winding roller 76 drive the winding roller 76 to rotate. At this time, the spiral spring contracts. After rotating to a certain number of circles, since the striking ball 75 is restricted by the connecting rope 74, when the striking ball 75 touches the fixing ring 70, the striking ball 75 limits the winding roller 76 in the reverse direction, and the winding roller 76 cannot rotate. At this time, the continuous rotation of the drive shaft 52 will drive the triangular block 73 to cancel the engagement with the matching groove. At this time, the winding roller 76 loses the force of the drive shaft 52 and rotates in the opposite direction under the action of the spiral spring. Under the action of the winding roller 76 and the pull rope 77, the striking ball 75 will move away from the drive shaft 52 due to centrifugal force until it touches the inner wall of the through groove 50, thereby vibrating the conical block 10.

[0063] Reference Figure 1 , Fig.11 and Fig.12 As shown, it is a structural schematic diagram of the discharge of NdFeB powder after stirring; specifically, a square feed pipe 80 is installed at the bottom of the mixing tank 1, and a first feed plate 81, a second feed plate 82 and a third feed plate 83 are slidably arranged inside the feed pipe 80, the first feed plate 81 and the third feed plate 83 are connected by a sliding rod 84, and the sliding direction of the second feed plate 82 is opposite to that of the first feed plate 81.

[0064] The NdFeB powder that has been stirred inside the mixing tank 1 needs to be discharged. However, during the discharging process, the discharge port is opened, which will cause the inert gas inside the mixing tank 1 to overflow synchronously and exchange with the air outside the mixing tank 1, resulting in the reduction of the anti-oxidation performance of the inert gas inside the mixing tank 1. The NdFeB powder is oxidized, and the oxidation effect may reduce the hardness of the NdFeB powder. In subsequent processing, such as pressing and sintering, it will affect the molding quality and dimensional accuracy of the material, resulting in unstable mechanical properties of the product, and prone to defects such as cracks and deformation.

[0065] It should be noted that the inside of the feed tube 80 is also filled with inert gas. When discharging after stirring is completed, the first feed plate 81 is first driven to slide open, and the NdFeB powder in the mixing tank 1 will fall onto the second feed plate 82. Then the first feed plate 81 is slid closed. At this time, the second feed plate 82 is opened, and the NdFeB powder on the second feed plate 82 will fall to the third feed plate 83, and the NdFeB powder in the mixing tank 1 will fall and be collected by the feed tube 80.

[0066] A push-pull plate 85 is slidably arranged inside the feed tube 80 between the second feed plate 82 and the third feed plate 83 via a tension spring, and an electromagnet 86 is installed on one end of the third feed plate 83 away from the slide rod 84 and one end of the push-pull plate 85 close to the third feed plate 83.

[0067] After the discharge is completed, the electromagnet 86 on the third feeding plate 83 and the electromagnet 86 on the push-pull plate 85 are energized. At this time, when the third feeding plate 83 slides in the opposite direction to block the feeding tube 80, the push-pull plate 85 moves synchronously with the third feeding plate 83, and the push-pull plate 85 slides inside the space below the second feeding plate 82 in the feeding tube 80 to push the air in the feeding tube 80 out of the feeding tube 80 until the third feeding plate 83 is completely reset, the electromagnet 86 is de-energized, and the push-pull plate 85 returns to its initial position under the action of the tension spring.

[0068] A first screw rod 110 and a second screw rod 111 are rotatably installed on the outer side of the feed tube 80, the slide rod 84 is threadedly connected to the first screw rod 110, and the second feed plate 82 is threadedly connected to the second screw rod 111. The first screw rod 110 and the second screw rod 111 are both reciprocating screws, and a synchronous wheel 112 is installed on the first screw rod 110 and the second screw rod 111 through ratchet teeth, and a synchronous belt 113 is sleeved on the two synchronous wheels 112.

[0069] The synchronous wheel 112 on the first screw rod 110 is rotated by external drive, and the control slide bar 84 causes the first feeding plate 81 and the third feeding plate 83 to slide back and forth. The synchronous wheel 112 on the first screw rod 110 rotates in the opposite direction, which can drive the second screw rod 111 to rotate and drive the second feeding plate 82 to slide.

[0070] Embodiment 2: On the basis of the first embodiment, in order to improve the mixing effect of the NdFeB powder, the shape of the mixing plate 41 is limited. When the NdFeB powder on the receiving plate 22 is scooped up during the rotation of the receiving plate 22, the sufficient mixing of the NdFeB powder is further promoted.

[0071] Reference Figure 4 Figure 6As shown, it is a schematic diagram of the structure of the receiving plate 22; specifically, the upper end of the receiving plate 22 is set to be inclined from the center to the outside, and the mixing plate 41 is set to a shape that is compatible with the upper end of the receiving plate 22. The NdFeB powder lifted by the mixing plate 41 will fall to the center position of the receiving plate 22. Due to the shape setting of the receiving plate 22, the NdFeB powder at the center position will slide from the center to the surroundings, and the receiving plate 22 is always in a rotating state during the mixing process, which makes the NdFeB powder on the receiving plate 22 move with the receiving plate 22 and is continuously lifted by the mixing plate 41, thereby improving the mixing effect.

[0072] Reference Figure 4 Figure 6 As shown, that is, a schematic diagram of the structure of the mixing plate 41; specifically, the surface of the mixing plate 41 is inclined outward from the mixing shaft 40, and the upper surface of the mixing plate 41 also tends to be inclined toward the drive shaft 52. During the rotation of the mixing plate 41, the NdFeB powder will also be scooped up. During the rotation of the mixing plate 41 following the mixing shaft 40, since the mixing plate 41 is inclined, the NdFeB powder on the mixing plate 41 will slide toward the drive shaft 52 and then fall onto the receiving plate 22, and the remaining powder that has not fallen will be moved to another position of the receiving plate 22 through the rotation of the mixing plate 41, thereby improving the mixing effect of the mixing plate 41.

[0073] During operation: In the first step, the NdFeB powder entering the mixing tank 1 falls onto the conical block 10 .

[0074] Step 2: Then make the drive shaft 52 rotate. During the rotation of the drive shaft 52, the triangular block 73 on the drive shaft 52 will rotate with the winding roller 76. At this time, the spiral spring contracts. After rotating a certain number of times, the triangular block 73 cancels the clamping connection with the winding roller 76. The winding roller 76 rotates in the opposite direction to drive the striking ball 75 to move away from the drive shaft 52, and strikes the conical block 10. At this time, the neodymium iron boron powder accumulated on the conical block 10 enters the spiral groove 30 on the feeding block 20 under the vibration of the conical block 10.

[0075] Step 3: The driving shaft 52 drives the feeding block 20 to rotate, and the NdFeB powder is moved to the receiving plate 22 through the feeding block 20. At the same time, the driving gear ring 60 on the driving shaft 52 will drive the driving gear 61 to rotate, and then the mixing shaft 40 connected to the driving gear 61 will rotate, and the mixing plate 41 on the mixing shaft 40 will scoop up the NdFeB powder on the receiving plate 22, and mix the NdFeB powder by cooperating with the receiving plate 22.

[0076] Step 4: After mixing, the NdFeB powder will enter the next feeding block 20, and will be transported to multiple receiving plates 22 in sequence through the feeding block 20 below. Through mixing at different speeds on the receiving plates 22, the NdFeB powder in the mixing tank 1 will be fully mixed.

[0077] Step 5: Drive the first feed plate 81 to slide open, the NdFeB powder in the mixing tank 1 will fall onto the second feed plate 82, and then the first feed plate 81 will slide closed. At this time, the second feed plate 82 is opened, and the NdFeB powder on the second feed plate 82 will fall to the third feed plate 83, and the NdFeB powder in the mixing tank 1 will fall and be collected by the feed pipe 80.

[0078] It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive.

[0079] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A NdFeB powder metallurgy mixing device, comprising a mixing tank (1), characterized in that: A conical block (10) is installed at the upper end of the mixing tank (1); a mixing device (2) for mixing NdFeB powder is arranged below the conical block (10) inside the mixing tank (1); the mixing device (2) comprises a feed block (20) equidistantly installed inside the mixing tank (1) along the height direction of the mixing tank (1); the feed block (20) is rotatably arranged inside the mixing tank (1); fixed pipes (21) are installed inside the mixing tank (1) below a plurality of the feed blocks (20); and receiving plates (22) are rotatably arranged below a plurality of the fixed pipes (21); The mixing tank (1) is filled with an inert gas to prevent the NdFeB powder from being oxidized; The receiving plate (22) is provided with a mixing mechanism (4) for mixing the NdFeB powder delivered by the feeding block (20).

2. The NdFeB powder metallurgy mixing equipment according to claim 1, characterized in that: The sides of the plurality of feeding blocks (20) are each provided with a spiral groove (30), the receiving plate (22) abuts against the feeding block (20) below it, and the receiving plate (22) is provided with a conveying groove (31) which is connected to the spiral groove (30) on the adjacent feeding block (20).

3. The NdFeB powder metallurgy mixing equipment according to claim 1, characterized in that: A through slot (50) penetrating the fixed tube (21) is provided inside the feed block (20), a connecting rod (51) is provided inside the through slot (50), a driving shaft (52) is rotatably provided inside the plurality of fixed tubes (21) via the connecting rod, and two adjacent driving shafts (52) are connected via a transmission (53).

4. The NdFeB powder metallurgy mixing equipment according to claim 1, characterized in that: The mixing mechanism (4) comprises a mixing shaft (40) rotatably arranged on a fixed tube (21) at equal intervals along the axis of a driving shaft (52); one end of the mixing shaft (40) passes through the fixed tube (21) and is arranged above a receiving plate (22); and a plurality of mixing plates (41) are mounted at equal intervals along the axis of the mixing shaft (40) at one end located above the receiving plate (22).

5. The NdFeB powder metallurgy mixing equipment according to claim 1, characterized in that: The receiving plate (22) and the feeding block (20) are provided with a matching piece (9), the matching piece (9) comprising an arc-shaped plate (90), the arc-shaped plate (90) being slidably arranged inside the conveying trough (31) by means of a spring, a push plate (91) being slidably arranged at the top of the feeding block (20) along its height direction by means of a push spring, a spring rod (92) being installed at one end of the arc-shaped plate (90) close to the feeding block (20), and the push plate (91) and the spring rod (92) being movably in contact with each other.

6. The NdFeB powder metallurgy mixing equipment according to claim 1, characterized in that: A vibrating member (7) for driving the conical block (10) to vibrate is arranged inside the mixing tank (1), and the vibrating member (7) comprises a fixing ring (70). A working groove connected to the through groove (50) is provided inside the conical block (10), and the fixing ring (70) is arranged inside the working groove. The fixing ring (70) is mounted on the inner wall of the through groove (50).

7. The NdFeB powder metallurgy mixing equipment according to claim 6, characterized in that: A plurality of connecting ropes (74) are arranged between the fixing ring (70) and the inner wall of the through groove (50) along the axis of the fixing ring (70), a striking ball (75) is slidably arranged on the connecting rope (74), a winding roller (76) is sleeved on the driving shaft (52) inside the fixing ring (70), a plurality of pulling ropes (77) are wound around the winding roller (76), and the other ends of the pulling ropes (77) are connected to the striking ball (75).

8. The NdFeB powder metallurgy mixing equipment according to claim 7, characterized in that: A receiving groove (72) is provided on the driving shaft (52), a triangular block (73) is slidably arranged in the receiving groove (72) via a spring, and a matching groove is provided on the inner wall of the winding roller (76), the matching groove being movably engaged with the triangular block (73).

9. The NdFeB powder metallurgy mixing equipment according to claim 1, characterized in that: A square feeding pipe (80) is installed at the bottom of the mixing tank (1), a first feeding plate (81), a second feeding plate (82) and a third feeding plate (83) are slidably arranged inside the feeding pipe (80), and the first feeding plate (81) and the third feeding plate (83) are connected by a sliding rod (84); A push-pull plate (85) is slidably arranged inside the feeding tube (80) between the second feeding plate (82) and the third feeding plate (83) via a tension spring, and an electromagnet (86) is installed at one end of the third feeding plate (83) away from the slide rod (84) and at one end of the push-pull plate (85) close to the third feeding plate (83).

10. A NdFeB powder metallurgy mixing method, comprising a NdFeB powder metallurgy mixing device according to any one of claims 1 to 9, characterized in that: The NdFeB powder metallurgy mixing method is as follows: S1, powder feeding: the NdFeB powder entering the mixing tank (1) falls onto the conical block (10); S2, feeding by rotation: the driving shaft (52) rotates, driving the striking ball (75) to strike the conical block (10), and then the lactoferrin powder enters the spiral groove (30) on the feeding block (20) under vibration; S3, mixing and stirring: the driving shaft (52) drives the feeding block (20) to rotate, and the NdFeB powder is moved to the receiving plate (22) through the feeding block (20). At the same time, the mixing shaft (40) rotates and drives the mixing plate (41) to scoop up the NdFeB powder on the receiving plate (22), and the NdFeB powder is mixed by cooperating with the receiving plate (22); S4, discharging completed: the NdFeB powder after mixing is dropped through the feeding pipe (80) and collected.

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