Powder mixing device for metal powder injection molding

Abstract

The application relates to the field of metal powder forming equipment, in particular to a powder mixing device for metal powder injection molding, which comprises a treatment tank, a concentration mechanism and a uniform mechanism; a discharge port and a feeding port are arranged at the bottom and the top of the treatment tank respectively; a plurality of communication grooves are circumferentially arranged on the outer wall of the treatment tank; the concentration mechanism is arranged in the treatment tank and is used for concentrating powder in the treatment tank; the concentration mechanism comprises a plurality of hinged plates hinged at the bottom of corresponding communication grooves; the two sides of each hinged plate are slidingly sealed with the two sides of the corresponding communication groove; a matching groove matched with the shape of the inner wall of the treatment tank is arranged on each hinged plate; the uniform mechanism is arranged in the treatment tank and is used for mixing the powder; the uniform mechanism comprises a stirring shaft coaxially arranged in the treatment tank; a plurality of stirring plates are circumferentially arranged on the stirring shaft along the axial direction. The application can uniformly mix multiple areas in the treatment tank through the cooperation of the stirring shaft and the hinged plate, thereby ensuring the mixing effect.

Description

Technical Field

[0001] This invention relates to the field of metal powder forming equipment, and more specifically, to a powder mixing device for metal powder injection molding. Background Technology

[0002] Metal powder mixing is a core pre-process in high-end manufacturing fields such as powder metallurgy, metal 3D printing, cemented carbide, brazing powder, composite material preparation, and magnetic materials. Its core purpose is to achieve uniform dispersion of two or more metal elemental powders, alloy powders, ceramic reinforcing powders, graphite, and lubricants with different materials, particle sizes, densities, and morphologies in a precise ratio, ensuring uniform composition, stable mechanical properties, and controllable dimensional consistency of the workpiece after molding, sintering, and additive manufacturing.

[0003] Chinese Patent CN114130273A discloses a stirrer and its method of use that can pre-disperse metal powder before mixing and use cold air to separate impurities from metal powder during stirring. The stirrer is characterized by having one end of a feed channel positioned at the top of a mixing drum and connected to the drum, the other end of the feed channel connected to one end of a collection channel, and the other end of the collection channel connected to a discharge cylinder. The diameter of the collection channel gradually increases from one end to the other. Multiple sets of rubber protrusions are equidistantly arranged along the circumference of the inner wall of the collection channel. Reinforcing ribs are placed between the feed channel and the mixing drum. A discharge pipe is located near the bottom of the side wall of the mixing drum, with one end connected to the mixing drum and the other end plugged with a sealing plug. An annular air supply pipe is sleeved on the feed channel. Multiple blowing cylinders are equidistantly arranged along the circumference of the inner wall of the feed channel, and each blowing cylinder has a right-angled trapezoidal structure.

[0004] In this patent, the metal powder and adhesive inside the mixing drum are mixed by blowing air. However, due to the large volume inside the mixing drum, the hollow stirring rod can only stir and mix the metal powder and adhesive on its horizontal plane, resulting in uneven mixing. Summary of the Invention

[0005] The main objective of this invention is to provide a powder mixing device for metal powder injection molding, which, through the cooperation of a stirring shaft and a hinge plate, enables uniform mixing of multiple areas inside the processing tank, thereby ensuring the mixing effect.

[0006] To achieve the above objectives, the present invention provides a powder mixing device for metal powder injection molding, comprising a processing tank, a concentrating mechanism, and a homogenizing mechanism; the processing tank is shaped like an inverted frustum, with a discharge port at the center of the bottom and a feed port at the top edge; the outer wall of the processing tank has multiple connecting grooves along the axial direction that connect to the interior of the processing tank; the concentrating mechanism is disposed inside the processing tank and is used to concentrate the powder into the processing tank; the concentrating mechanism includes multiple hinge plates hinged to the bottom of the corresponding connecting grooves; the two sides of the hinge plates are slidably sealed to the two sides of the corresponding connecting grooves, and each hinge plate has a fitting groove conforming to the shape of the inner wall of the processing tank on the side closest to the interior of the corresponding processing tank; the homogenizing mechanism is disposed inside the processing tank and is used to mix the powder; the homogenizing mechanism includes a stirring shaft coaxially rotatably disposed inside the processing tank; the stirring shaft has multiple stirring plates circumferentially disposed along the axial direction.

[0007] Preferably, each stirring plate is inclined and the surface of each stirring plate is tangent to the outer wall of the stirring shaft.

[0008] Preferably, the central mechanism further includes a mounting plate and a rotating ring; the mounting plate is located at the center of the bottom of the treatment tank, and two arc-shaped grooves are provided on the mounting plate. The rotating ring is rotatably located in the corresponding arc-shaped groove. The rotating ring is coaxially arranged with the treatment tank. Multiple triangular guide blocks are circumferentially arranged on the side of the rotating ring closest to the treatment tank. Each hinge plate has an arc surface that cooperates with the triangular guide block on the side away from the fitting groove.

[0009] Preferably, the top of the processing tank is also provided with a drive mechanism for driving the stirring shaft and the rotating ring to rotate.

[0010] Preferably, the drive mechanism includes an L-shaped guide plate, a drive motor, and a drive gear; one end of the L-shaped guide plate is located at the end of the mounting plate, and the other end is located at the center of the top of the processing tank, with the mounting plate and the L-shaped guide plate forming a U-shape; the top of the stirring shaft passes through the L-shaped guide plate and is provided with a driven wheel, and the L-shaped guide plate is also provided with a driving wheel, which is connected to the driven wheel by a synchronous belt drive; the drive motor is located on the L-shaped guide plate and is used to drive the driving wheel to rotate; a connecting shaft is provided at the center of the driving wheel, the connecting shaft passes through the L-shaped guide plate and is provided with a drive gear, and the outer wall of the rotating ring is provided with multiple tooth grooves in the circumferential direction, with the drive gear meshing with the corresponding tooth grooves.

[0011] Preferably, a discharge pipe is provided inside the discharge port, and an installation hole for accommodating the discharge pipe is provided on the mounting plate. The discharge pipe is placed inside the installation hole, and the bottom of the stirring shaft extends into the discharge pipe and is provided with spiral blades. A sealing disc for sealing and opening the end of the discharge pipe is also rotatably provided on the mounting plate.

[0012] Preferably, the hinge plate has a buffer cavity inside, and each hinge plate has an air inlet connected to the buffer cavity at the end away from the fitting groove. Each hinge plate has multiple exhaust holes on both sides at the end near the inside of the treatment tank. The exhaust holes are inclined upwards, and each exhaust hole is equipped with a one-way valve.

[0013] Preferably, the stirring shaft has a hollow cavity inside, each stirring plate has a connecting groove inside, the connecting groove communicates with the hollow cavity, and each stirring plate has an exhaust groove communicating with the connecting groove on the side near the discharge port.

[0014] Preferably, an air pump is provided on the L-shaped guide plate, and an exhaust pipe is provided at the output end of the air pump. The exhaust pipe is coaxially arranged with the stirring shaft and is connected to the hollow cavity of the stirring shaft. An air supply hollow ring is also provided on the side of the L-shaped guide plate near the processing tank. The air supply hollow ring is connected to the exhaust pipe through a first connecting pipe. Multiple second connecting pipes are arranged circumferentially on the air supply hollow ring, and the second connecting pipes are connected to the corresponding air inlets.

[0015] The advantages of this application compared to the prior art are: 1. This application utilizes the cooperation of a hinged plate and a stirring shaft to allow the hinged plate to extend into the processing tank along the connecting groove, pushing the metal powder and binder closer to the stirring shaft. This pushes the metal powder and binder at the edge to the center. With the cooperation of the stirring shaft, the stirring plate on the stirring shaft can more effectively mix the metal powder and binder. Secondly, because the hinged plate extends into the processing tank, the volume inside the processing tank switches back and forth between decreasing and increasing, allowing the height of the metal powder and binder inside the processing tank to intermittently increase and decrease. This enables the stirring plate on the stirring shaft to mix metal powder and binder at different heights inside different processing tanks, thereby further improving the mixing effect.

[0016] 2. In this application, the mixing plate and the mixing shaft are used together. The mixing plate is set at an angle, so that the metal powder and binder located in the middle of the processing tank can move towards the metal powder and binder near the edge when the mixing shaft rotates, so that the metal powder and binder in different positions inside the processing tank can be mixed with each other.

[0017] 3. This application utilizes the cooperation of a hinge plate and a stirring plate to deliver gas into the buffer chamber through the air inlet. The gas can enter the processing tank through the exhaust port, thereby blowing the metal powder and adhesive, which not only cools them down but also further mixes them. Secondly, the exhaust ports on both sides of the stirring plate are preferably arranged in two rows. When the exhaust port near the bonding groove is in contact with the inner wall of the connecting groove, the gas can be discharged through the second row of exhaust ports, thereby dissipating the heat inside the hinge plate, cooling the hinge plate, and further cooling the inside of the processing tank. Attached Figure Description

[0018] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention, making other features, objects, and advantages of the invention more apparent. The illustrative embodiments of the invention illustrated in the drawings and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a perspective view of the present invention in use; Figure 2 This is the three-dimensional representation of the present invention. Figure 1 ; Figure 3 yes Figure 2 Enlarged view of a portion of point A in the middle; Figure 4 This is the three-dimensional representation of the present invention. Figure 2 ; Figure 5 This is a top view of the present invention; Figure 6 yes Figure 5 A planar sectional view along the BB direction; Figure 7 yes Figure 6 Enlarged view of a section at point C; Figure 8 yes Figure 6 Enlarged view of a section at point D; Figure 9 This is a partial exploded perspective view of the present invention; Figure 10 This is a three-dimensional sectional view of the hinge plate in this invention.

[0019] The numbers in the above figure are: 1-Processing tank; 11-Discharge port; 111-Discharge pipe; 12-Inlet; 13-Connecting trough; 2-Centralized mechanism; 21-Hinge plate; 211-Mating groove; 212-Arc surface; 213-Buffer chamber; 214-Air inlet; 215-Exhaust port; 216-One-way valve; 22-Mounting plate; 221-Arc-shaped slide groove; 222-Mounting hole; 223-Sealing disc; 23-Rotating ring; 231-Triangular guide block; 232-Groove; 3-Homing mechanism; 31-Stirring shaft; 311-Driven wheel; 312-Helical blade; 313-Hollow cavity; 32-Stirring plate; 321-Connecting groove; 322-Exhaust groove; 4-Drive mechanism; 41-L-shaped guide plate; 411-Drive wheel; 4111-Synchronous belt; 412-Connecting shaft; 413-Air pump; 414-Exhaust pipe; 415-Air supply hollow ring; 4151-First connecting pipe; 4152-Second connecting pipe; 42-Drive motor; 43-Drive gear; 44-U-shaped reinforcing plate; 100 - Screw injection molding machine; 200 - Frame; 300 - Injection mold. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0021] Example 1

[0022] This device is installed at the feed port of the screw injection molding machine 100. The screw injection molding machine is mounted on the frame 200. An injection mold 300 is also installed at the end of the frame 200 away from the screw injection molding machine. The injection mold 300 is connected to the output end of the screw injection molding machine 100.

[0023] See Figures 1 to 10 As shown, a powder mixing device for metal powder injection molding includes a processing tank 1, a concentrating mechanism 2, and a homogenizing mechanism 3. The processing tank 1 is shaped like an inverted frustum, with a discharge port 11 at the center of the bottom and a feed port 12 at the top edge. Multiple connecting grooves 13 are provided along the axial direction on the outer wall of the processing tank 1, communicating with the interior of the processing tank 1. The concentrating mechanism 2 is located inside the processing tank 1 and is used to concentrate the powder into the interior of the processing tank 1. The concentrating mechanism 2 includes multiple hinge plates 21 hinged to the bottom of the corresponding connecting grooves 13. The two sides of the hinge plates 21 are slidably sealed to the two sides of the corresponding connecting grooves 13. Each hinge plate 21 has a fitting groove 211 conforming to the shape of the inner wall of the processing tank 1 on the side closest to the interior of the corresponding processing tank 1. The homogenizing mechanism 3 is located inside the processing tank 1 and is used to mix the powder. The homogenizing mechanism 3 includes a stirring shaft 31 coaxially rotatably disposed inside the processing tank 1. Multiple stirring plates 32 are circumferentially arranged along the axial direction of the stirring shaft 31.

[0024] The hinge plate 21 is fitted to the inner wall of the corresponding connecting groove 13, and the side of the hinge plate 21 near the inner wall of the processing tank 1 is provided with a fitting groove 211 that conforms to the shape of the inner wall of the processing tank 1. This not only allows multiple hinge plates 21 to form a sealed space between the multiple hinge plates 21 and the inside of the processing tank 1, thereby preventing powder and adhesive from leaking from the connecting groove 13, but also allows the hinge plate 21 and the lower end of the processing tank 1 to form an inverted funnel shape, thereby facilitating the discharge of the mixed metal powder. When the metal powder and adhesive are put into the processing tank 1 through the feed port 12, as the multiple hinge plates 21 rotate along the corresponding hinge positions, the hinge plates 21 can extend into the inside of the processing tank 1 along the connecting groove 13. The hinge plates 21 can contact the metal powder and adhesive located inside the processing tank 1, thereby pushing the metal powder and adhesive... The adhesive moves closer to the stirring shaft 31, pushing the metal powder and adhesive from the edge to the center. With the assistance of the stirring shaft 31, the stirring plate 32 on the shaft can more effectively mix the metal powder and adhesive. Secondly, because multiple hinged plates 21 intermittently extend into the processing tank 1, the volume inside the tank 1 alternates between decreasing and increasing. Since the total volume of the metal powder and adhesive remains constant, the height of the metal powder and adhesive inside the processing tank 1 can intermittently increase and decrease. This allows the stirring plate 32 on the stirring shaft 31 to mix metal powder and adhesive at different heights inside the processing tank 1, further improving the mixing effect. After mixing, the mixed material is discharged through the discharge port 11 into the screw injection molding machine 100. The screw injection molding machine 100 melts the mixed material and injects it into the injection mold 300, thus enabling subsequent injection molding.

[0025] See Figure 6 and Figure 9 As shown, each stirring plate 32 is inclined and the surface of each stirring plate 32 is tangent to the outer wall of the stirring shaft 31.

[0026] The surface of the stirring plate 32 is tangent to the outer wall of the stirring shaft 31. As the stirring shaft 31 rotates, it can push the metal powder and binder located at the center of the processing tank 1 toward the inner wall of the processing tank 1. By cooperating with the hinge plate 21, the metal powder and binder located at the middle and edge of the processing tank 1 can further contact and mix with each other, thereby further improving the mixing effect of the metal powder and binder.

[0027] See Figures 4 to 9As shown, the central mechanism 2 also includes a mounting plate 22 and a rotating ring 23; the mounting plate 22 is located at the center of the bottom of the processing tank 1, and two arc-shaped grooves 221 are provided on the mounting plate 22. The rotating ring 23 is rotatably disposed in the corresponding arc-shaped groove 221. The rotating ring 23 is coaxially disposed with the processing tank 1. Multiple triangular guide blocks 231 are circumferentially disposed on the side of the rotating ring 23 closest to the processing tank 1. Each hinge plate 21 is provided with an arc surface 212 that cooperates with the triangular guide block 231 on the side away from the fitting groove 211.

[0028] The rotating ring 23 can rotate through the arc-shaped groove 221. The rotating ring 23 is provided with a plurality of triangular guide blocks 231. As the rotating ring 23 rotates, the triangular guide blocks 231 can contact the arc surface 212 of the corresponding hinge plate 21 in sequence, so that the corresponding hinge plate 21 can rotate along the hinge position and extend into the corresponding processing tank 1. The hinge plate 21 can occupy the volume inside the processing tank 1 in sequence, so that the metal powder and adhesive inside the processing tank 1 can be fully mixed inside the processing tank 1.

[0029] See Figures 3 to 8 As shown, the top of the processing tank 1 is also provided with a drive mechanism 4 for driving the stirring shaft 31 and the rotating ring 23 to rotate; the drive mechanism 4 includes an L-shaped guide plate 41, a drive motor 42 and a drive gear 43; one end of the L-shaped guide plate 41 is provided at the end of the mounting plate 22, and the other end is provided at the center of the top of the processing tank 1, and the mounting plate 22 and the L-shaped guide plate 41 are U-shaped; the top of the stirring shaft 31 passes through the L-shaped guide plate 41 and is provided with a driven wheel 311, and the L-shaped guide plate 41 is also provided with a driving wheel 411, and the driven wheel 311 and the driving wheel 411 are connected by a synchronous belt 4111; the drive motor 42 is provided on the L-shaped guide plate 41 and is used to drive the driving wheel 411 to rotate; a connecting shaft 412 is provided at the center of the driving wheel 411, the connecting shaft 412 passes through the L-shaped guide plate 41 and is provided with a drive gear 43, and the outer wall of the rotating ring 23 is provided with multiple tooth grooves 232 in the circumferential direction, and the drive gear 43 meshes with the corresponding tooth grooves 232.

[0030] U-shaped reinforcing plates 44 are also provided on both sides of the L-shaped guide plate 41 to reinforce the device. Secondly, a drive motor 42 is provided, which drives the drive wheel 411 to rotate. The drive wheel 411 drives the driven wheel 311 to rotate through the synchronous belt 4111. The drive wheel 411 can drive the drive gear 43 to rotate through the connecting shaft 412. The drive gear 43 can drive the rotating ring 23 to rotate through the tooth groove 232, so that the rotating ring 23 can rotate synchronously with the stirring shaft 31. Thus, while the stirring shaft 31 rotates, the hinge plate 21 can rotate and extend into the processing tank 1, thereby disturbing all areas inside the processing tank 1, so that the metal powder and the binder can be mixed.

[0031] See Figures 3 to 9 As shown, a discharge pipe 111 is provided inside the discharge port 11, and a mounting hole 222 for accommodating the discharge pipe 111 is provided on the mounting plate 22. The discharge pipe 111 is set in the mounting hole 222. The bottom of the stirring shaft 31 extends into the discharge pipe 111 and is provided with a spiral blade 312. A sealing disc 223 for sealing and opening the end of the discharge pipe 111 is also rotatably provided on the mounting plate 22.

[0032] The spiral blade 312 is attached to the inner wall of the discharge pipe 111, and the sealing disc 223 is used to seal the end of the discharge pipe 111. At this time, with the rotation of the stirring shaft 31, the metal powder and adhesive located in the discharge pipe 111 can be spirally pushed into the processing tank 1. With the cooperation of the stirring plate 32, the metal powder and adhesive can be dispersed towards the inner wall of the processing tank 1, thereby avoiding the accumulation of metal powder and adhesive in the discharge pipe 111 and avoiding the problem of uneven mixing.

[0033] See Figure 10 As shown, a buffer cavity 213 is provided inside the hinge plate 21. An air inlet 214 communicating with the buffer cavity 213 is provided at the end of each hinge plate 21 away from the fitting groove 211. Multiple exhaust holes 215 are provided on both sides of the end of each hinge plate 21 near the inside of the processing tank 1. The exhaust holes 215 are inclined upwards, and a one-way valve 216 is provided in each exhaust hole 215.

[0034] Since the metal powder and adhesive generate heat during mixing, to prevent excessive heat from melting the metal powder and adhesive, an air inlet 214 is provided. Gas is supplied to the buffer chamber 213 through the air inlet 214, and the gas can enter the processing tank 1 through the exhaust port 215, thereby blowing the metal powder and adhesive, which not only cools them down but also further mixes them. Secondly, the exhaust ports 215 on both sides of the stirring plate 32 are preferably arranged in two rows. When the exhaust ports 215 near the bonding groove 211 are in contact with the inner walls on both sides of the connecting groove 13, the gas can be discharged through the second row of exhaust ports 215, thereby venting the heat inside the hinge plate 21 and cooling the hinge plate 21, further cooling the inside of the processing tank 1. The one-way valve 216 ensures unidirectional flow of the exhaust ports 215, thereby preventing the metal powder and adhesive from entering the buffer chamber 213 and causing blockage inside the hinge plate 21.

[0035] See Figures 6 to 9As shown, the stirring shaft 31 has a hollow cavity 313 inside, and each stirring plate 32 has a connecting groove 321 inside, which is connected to the hollow cavity 313. Each stirring plate 32 has an exhaust groove 322 connected to the connecting groove 321 on the side near the discharge port 11.

[0036] By providing a hollow cavity 313, gas is introduced into the hollow cavity 313, which allows the gas to blow the metal powder and adhesive inside the processing tank 1 along the hollow cavity 313, connecting groove 321, and exhaust groove 322. Through the interaction with the hinge plate 21, the gas in the exhaust hole 215 and the gas in the exhaust groove 322 can impact each other inside the processing tank 1, thereby further mixing the metal powder and adhesive. Furthermore, the exhaust groove 322 is located on the side of the stirring plate 32 near the discharge port 11, which can prevent the metal powder and adhesive from entering the stirring shaft 31.

[0037] See Figures 2 to 7 As shown, an air pump 413 is provided on the L-shaped guide plate 41. An exhaust pipe 414 is provided at the output end of the air pump 413. The exhaust pipe 414 is coaxially arranged with the stirring shaft 31 and is connected to the hollow cavity 313 of the stirring shaft 31. An air supply hollow ring 415 is also provided on the side of the L-shaped guide plate 41 near the processing tank 1. The air supply hollow ring 415 is connected to the exhaust pipe 414 through a first connecting pipe 4151. A plurality of second connecting pipes 4152 are arranged circumferentially on the air supply hollow ring 415. The second connecting pipes 4152 are connected to the corresponding air inlet 214.

[0038] By providing an air pump 413, which supplies gas to the hollow cavity 313 and the air supply hollow ring 415 through an exhaust pipe 414 and a first connecting pipe 4151 respectively, and the air supply hollow ring 415 is circumferentially provided with multiple second connecting pipes 4152, which are connected to the corresponding air inlets 214, gas can be supplied to the hollow cavity 313 and the buffer cavity 213 simultaneously, thereby achieving thorough mixing of metal powder and adhesive.

[0039] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A powder mixing device for metal powder injection molding, characterized in that, Includes processing tanks, centralizing mechanisms, and homogenizing mechanisms; The processing tank is shaped like an inverted frustum. A discharge port is located at the center of the bottom of the processing tank, and a feed port is located at the top edge of the processing tank. Multiple connecting grooves connecting the inside of the processing tank are provided along the axial direction on the outer wall of the processing tank. A concentrating mechanism is located inside the processing tank and is used to concentrate the powder into the processing tank. The concentrating mechanism includes multiple hinge plates hinged to the bottom of the corresponding connecting grooves. The two sides of the hinge plates slide and seal with the two sides of the corresponding connecting grooves. Each hinge plate has a fitting groove that conforms to the shape of the inner wall of the processing tank on the side closest to the inside of the corresponding processing tank. A homogenizing mechanism is installed inside the processing tank and is used to mix the powder; the homogenizing mechanism includes a stirring shaft that is coaxially rotatably installed inside the processing tank; the stirring shaft has multiple stirring plates arranged circumferentially along the axial direction.

2. The powder mixing device for metal powder injection molding according to claim 1, characterized in that, Each mixing plate is set at an angle and the surface of each mixing plate is tangent to the outer wall of the mixing shaft.

3. The powder mixing device for metal powder injection molding according to claim 1, characterized in that, The central mechanism also includes a mounting plate and a rotating ring; The mounting plate is located at the center of the bottom of the treatment tank. The mounting plate has two arc-shaped grooves. The rotating ring is rotatably set in the corresponding arc-shaped groove. The rotating ring is coaxial with the treatment tank. Multiple triangular guide blocks are circumferentially arranged on the side of the rotating ring closest to the treatment tank. Each hinge plate has an arc surface that mates with the triangular guide blocks on the side away from the fitting groove.

4. The powder mixing device for metal powder injection molding according to claim 3, characterized in that, The top of the processing tank is also equipped with a drive mechanism for driving the stirring shaft and rotating ring.

5. The powder mixing device for metal powder injection molding according to claim 4, characterized in that, The drive mechanism includes an L-shaped guide plate, a drive motor, and a drive gear; One end of the L-shaped guide plate is set at the end of the mounting plate, and the other end is set at the center of the top of the treatment tank. The mounting plate and the L-shaped guide plate form a U-shape. The top of the stirring shaft passes through an L-shaped guide plate and is equipped with a driven wheel. The L-shaped guide plate is also equipped with a driving wheel. The driven wheel and the driving wheel are connected by a synchronous belt drive. The drive motor is mounted on the L-shaped guide plate and is used to drive the driving wheel to rotate. A connecting shaft is provided at the center of the drive wheel. The connecting shaft passes through the L-shaped guide plate and is provided with a drive gear. Multiple tooth grooves are provided circumferentially on the outer wall of the rotating ring, and the drive gear meshes with the corresponding tooth grooves.

6. The powder mixing device for metal powder injection molding according to claim 3, characterized in that, The discharge port is equipped with a discharge pipe, and the mounting plate is also equipped with a mounting hole for accommodating the discharge pipe. The discharge pipe is installed in the mounting hole, and the bottom of the stirring shaft extends into the discharge pipe and is equipped with spiral blades. The mounting plate is also equipped with a sealing disc that can rotate to seal and open the end of the discharge pipe.

7. The powder mixing device for metal powder injection molding according to claim 5, characterized in that, The hinge plate has a buffer chamber inside. Each hinge plate has an air inlet that connects to the buffer chamber at the end away from the fitting groove. Each hinge plate has multiple exhaust holes on both sides at the end closest to the inside of the treatment tank. The exhaust holes are inclined upwards and each exhaust hole is equipped with a one-way valve.

8. The powder mixing device for metal powder injection molding according to claim 7, characterized in that, The mixing shaft has a hollow cavity inside, and each mixing plate has a connecting groove inside, which is connected to the hollow cavity. Each mixing plate has an exhaust groove connected to the connecting groove on the side near the discharge port.

9. A powder mixing device for metal powder injection molding according to claim 8, characterized in that, An air pump is installed on the L-shaped guide plate. An exhaust pipe is installed at the output end of the air pump. The exhaust pipe is coaxial with the stirring shaft and is connected to the hollow cavity of the stirring shaft. An air supply hollow ring is also installed on the side of the L-shaped guide plate near the processing tank. The air supply hollow ring is connected to the exhaust pipe through a first connecting pipe. Multiple second connecting pipes are arranged circumferentially on the air supply hollow ring, and the second connecting pipes are connected to the corresponding air inlets.

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