Metal powder continuous injection molding machine

Abstract

The application discloses a metal powder continuous injection molding machine, and relates to the technical field of metal powder molding, which comprises a placing plate, first aluminum profile frames are fixedly arranged at the corners of the upper surface of the placing plate, a support panel is fixedly arranged at the top of the first aluminum profile frame, second aluminum profile frames are fixedly arranged at the side of the upper surface of the support panel, a flow guide box is fixedly arranged in the inner cavity of the support panel, and a feeding port penetrates through the top of the outer surface of the flow guide box. The placing plate is arranged to provide a stable mounting and operation platform for the whole injection molding machine, and is used for bearing the lower mold and ensuring horizontal positioning. The first aluminum profile frames and the second aluminum profile frames are arranged to jointly form a modular, lightweight and high-rigidity main support frame of the equipment, and the first aluminum profile frames bear the main vertical load. The effect of preventing internal blockage during metal powder injection is achieved.

Description

Technical Field

[0001] This invention relates to the field of metal powder molding technology, specifically to a continuous injection molding machine for metal powder. Background Technology

[0002] Metal powder forming is an advanced manufacturing technology that uses metal powder to manufacture parts. The metal powder used is barium-tungsten cathode powder, with tungsten powder as the core material. Its core process mainly includes three steps: powder preparation, forming, and sintering. First, metal powder with specific composition, particle size, and shape is prepared using methods such as atomization, reduction, or mechanical alloying. Then, the powder is loaded into a mold, and external force is used to densify it and form a preform of a predetermined shape. Common forming techniques include isostatic pressing, powder injection molding, and additive manufacturing. Finally, the preform is sintered at high temperature in a protective atmosphere (such as hydrogen, nitrogen, or vacuum). During sintering, metallurgical bonding occurs between powder particles through atomic diffusion, causing the preform to shrink and densify, ultimately achieving the desired mechanical properties, physical properties, and microstructure.

[0003] In metal powder injection molding, blockage of the feed (a homogeneous mixture of metal powder and binder) inside the injection unit can trigger a series of serious chain reactions, directly affecting production stability, product quality, and production costs. The primary impact is production interruption and reduced efficiency. Blockage can directly lead to abnormally high injection pressure or insufficient injection volume, forcing the machine to stop. Cleaning blockages—especially in critical flow channels such as the screw, barrel, or nozzle—is a tedious and time-consuming process, requiring disassembly, heated cleaning, and reassembly, resulting in significant production line downtime, disrupting production plans, and reducing overall equipment efficiency. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: a continuous injection molding machine for metal powder, comprising a placement plate. First aluminum profile frames are fixed to the corners of the upper surface of the placement plate. A support panel is fixed to the top of the first aluminum profile frame. A second aluminum profile frame is fixed to the side of the upper surface of the support panel. A flow guide box is fixed to the inner cavity of the support panel. A feed inlet is penetrating the top of the outer surface of the flow guide box. By setting the placement plate, a stable installation and operating platform is provided for the entire injection molding machine, supporting the lower mold and ensuring its horizontal positioning. The first and second aluminum profile frames together constitute a modular, lightweight, and highly rigid main support frame for the equipment. The first aluminum profile frame bears the main vertical load, while the second aluminum profile frame provides a precise installation reference for the upper conveying and driving unit. The support panel serves as the mounting base for the flow guide box and the upper mechanism, ensuring the relative positional accuracy between the components. A flow guide box is incorporated to form a temporary storage, mixing, and conveying channel for the metal powder (the metal powder is barium-tungsten cathode powder, the core material of which is tungsten powder). Its interior is smoothed to reduce powder adhesion and flow resistance. An inlet is provided as the entry point for adding the mixture of metal powder and binder, equipped with a valve to achieve intermittent feeding. The system also includes:

[0005] A conveying unit, used for conveying metal powder, is located inside the guide box. This conveying unit is the core power source driving the metal powder mixture from the storage area to the injection end, ensuring continuous, stable, and controllable material conveying.

[0006] The flow-diverting mechanism is used to divert metal powder into the mold cavity. This mechanism is fixed to the bottom of the flow guide box. By setting up the flow-diverting mechanism, the incoming material is evenly distributed to multiple injection heads, making it a key component for achieving simultaneous injection at multiple points in a single mold cavity or for large parts.

[0007] The conveying unit includes a connecting frame and an agitation mechanism. The connecting frame is fixed to the top of the second aluminum profile frame. A stepper motor is fixed to the inner wall of the connecting frame. The agitation mechanism is located in the inner cavity of the guide box. The agitation mechanism includes a rotating cylinder, which is rotatably connected to the inner cavity of the guide box. A spiral blade is fixed to the outer surface of the rotating cylinder, and the spiral blade is frictionally adapted to the inner wall of the guide box.

[0008] Preferably, the output end of the stepper motor is equipped with a rotating rod via a coupling. A first driving wheel is fixed on the outer surface of the rotating rod, and a second driving wheel is fixed on the bottom end of the rotating rod. A first rolling bearing is fixed on the top of the outer surface of the rotating cylinder. The first rolling bearing is fixed on the top of the inner wall of the guide box. A first driven wheel is fixed on the top of the rotating cylinder. The first driven wheel is connected to the second driving wheel via a second belt.

[0009] Preferably, a second rolling bearing is fixedly provided on the inner wall of the rotating cylinder, a rotating column is fixedly provided on the inner ring of the second rolling bearing, a second driven wheel is fixedly provided on the top of the rotating column, and the second driven wheel is connected to the first driving wheel through a first belt.

[0010] Preferably, a reciprocating lead screw is fixed at the bottom end of the rotating column, a threaded ring is threaded on the outer surface of the reciprocating lead screw, a sliding tube is fixed on the outer surface of the threaded ring, a plurality of evenly distributed protrusions are provided on the outer surface of the sliding tube, a plurality of evenly distributed grooves are provided on the inner wall of the rotating cylinder, and the protrusions provided on the outer surface of the sliding tube are slidably connected to the grooves.

[0011] Preferably, a cone is fixed at the bottom end of the sliding tube, and the cone is rotatably connected to the bottom of the inner cavity of the guide box. When the cone is located at the bottom of the guide box, its outer surface is rubbed against the inner wall of the guide box. The outer surface of the cone is provided with a number of evenly distributed discharge grooves.

[0012] Preferably, the diversion mechanism includes a connecting cylinder, which is welded to the bottom opening of the diversion box. A sliding cylinder is slidably connected to the inner cavity of the connecting cylinder. A funnel is welded to the bottom of the sliding cylinder, and a branch box is welded to the bottom of the funnel. The branch box is formed by merging two boxes with three channels inside.

[0013] Preferably, injection tubes are fixed at the three openings on the lower surface of the branch box, and the diameter of the injection tubes is the same as the diameter of the mold opening. A guide ball is fixed at the interface of the inner cavity channel of the branch box, and the inner cavity of the guide ball is hollow. The bottom end of the injection tube is located directly above the placement plate.

[0014] Preferably, a fixing frame is fixed on the outer side of the support panel, a hydraulic cylinder is fixed on the inner wall of the fixing frame, and an extrusion frame is fixed on the outer surface of the branch box, with the movable end of the hydraulic cylinder fixed at the end of the extrusion frame.

[0015] Preferably, a support rod is fixed to the outer surface of the branch box, a sliding ring is fixed to the top of the support rod, a limiting rod is fixed to the lower surface of the support panel, the sliding ring is slidably connected to the outer surface of the limiting rod, a spring is fixed to the lower surface of the sliding ring, the spring is sleeved on the outer surface of the limiting rod, and the bottom end of the spring is fixed to the bottom end of the limiting rod.

[0016] This invention provides a continuous injection molding machine for metal powder. It has the following beneficial effects:

[0017] I. This continuous injection molding machine for metal powder, by setting up a support panel as the mounting base for the guide box and upper mechanism, ensures the relative positional accuracy between the components. The guide box forms a temporary storage, mixing, and conveying channel for the metal powder; its interior is smoothed to reduce powder adhesion and flow resistance. The feed inlet serves as the entry point for adding the mixture of metal powder and binder, and is equipped with a valve to achieve intermittent feeding.

[0018] II. This continuous injection molding machine for metal powder, through its conveying unit, serves as the core power source driving the metal powder mixture from the storage area to the injection end, ensuring continuous, stable, and controllable material conveying. The agitation mechanism, through its core function of continuous shearing and stirring during conveying, prevents segregation or sedimentation of the powder and binder, ensuring the uniformity of the mixture. The conveying unit is comprised of a rotating cylinder and spiral blades. The rotating cylinder acts as the rotating shell, while the spiral blades are welded to it, generating axial thrust during rotation to achieve forced forward conveying of the material. Simultaneously, its tight fit with the inner wall of the guide box effectively prevents material backflow.

[0019] Third, this continuous injection molding machine for metal powder, by setting up a diversion mechanism, is responsible for evenly distributing the delivered material to multiple injection heads, which is a key component for realizing simultaneous injection of multiple cavities in one mold or multiple points of large parts.

[0020] IV. This continuous injection molding machine for metal powder utilizes a reciprocating screw—a special type of screw with a unique thread—to convert the continuous rotational motion of the rotating cylinder into the periodic reciprocating linear motion of the threaded ring and the sliding tube along the axis. The threaded ring acts as the nut for the reciprocating motion, precisely engaging with the reciprocating screw. The sliding tube and its outer surface protrusions act as the actuators for the reciprocating motion; the protrusions are designed to transmit torque. A groove on the inner wall of the rotating cylinder forms a keyway with the protrusions on the sliding tube. The key function of this structure is that it allows the sliding tube to slide axially relative to the rotating cylinder while simultaneously constraining their circumferential rotation, thus forcing the sliding tube to rotate synchronously with the rotating cylinder. This composite motion of "synchronous rotation + axial reciprocation" generates extremely strong shearing, tumbling, and axial pushing effects on the material, greatly enhancing mixing and anti-clogging capabilities.

[0021] V. This continuous injection molding machine for metal powder incorporates a conical barrel as the terminal component of the agitation and conveying mechanism. Its conical structure helps to collect material at the center of the bottom of the guide box. By fixing it to the bottom of the sliding tube, the conical barrel inherits the "rotation + reciprocating" composite motion of the sliding tube. The frictional fit between its outer surface and the inner wall of the guide box allows for a temporary local seal when the reciprocating motion reaches the lower dead center, which is beneficial for pressurization and controlled discharge. The uniform discharge grooves on the surface of the conical barrel are its core function: when the conical barrel rotates, these grooves scrape material from the central area and convey it to the outer periphery; when it reciprocates, the volume change of the grooves further promotes material exchange and prevents bridging at the outlet, ensuring that the material can smoothly and controllably enter the diversion mechanism below. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the external structure of a continuous metal powder injection molding machine according to the present invention;

[0023] Figure 2 This is a side view of the structure of a continuous metal powder injection molding machine according to the present invention;

[0024] Figure 3 This is a schematic diagram of the conveying unit structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the stirring mechanism of the present invention;

[0026] Figure 5 This is a partial cross-sectional structural diagram of the stirring mechanism of the present invention;

[0027] Figure 6 This is a schematic diagram of the diversion mechanism structure of the present invention;

[0028] Figure 7 This is a schematic diagram of the disassembled structure of the diversion mechanism of the present invention;

[0029] Figure 8 This is a partial structural diagram of the diversion mechanism of the present invention;

[0030] Figure 9 This is a front view of the diversion mechanism structure of the present invention.

[0031] In the diagram: 1. Placement plate; 2. First aluminum profile frame; 3. Support panel; 4. Second aluminum profile frame; 5. Air guide box;

[0032] 6. Conveying unit; 61. Connecting frame; 62. Stepper motor; 63. Rotating rod; 64. First driving wheel; 65. Second driving wheel; 66. First belt; 67. Rotating column; 68. Second belt; 69. Agitating mechanism; 691. First rolling bearing; 692. Rotating cylinder; 693. First driven wheel; 694. Groove; 695. Spiral blade; 696. Second rolling bearing; 697. Second driven wheel; 698. Reciprocating screw; 699. Threaded ring; 6910. Sliding tube; 6911. Conical barrel;

[0033] 7. Diverting mechanism; 71. Connecting cylinder; 72. Sliding cylinder; 73. Funnel; 74. Branch box; 75. Extrusion frame; 76. Injection tube; 77. Guide ball; 78. Fixing frame; 79. Hydraulic cylinder; 710. Support rod; 711. Sliding ring; 712. Spring; 713. Limiting rod; 8. Feed port. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

[0035] like Figures 1-9 As shown, the present invention provides a technical solution: a continuous injection molding machine for metal powder, including a placement plate 1. First aluminum profile frames 2 are fixed to the corners of the upper surface of the placement plate 1. A support panel 3 is fixed to the top of the first aluminum profile frame 2. A second aluminum profile frame 4 is fixed to the side of the upper surface of the support panel 3. A flow guide box 5 is fixed to the inner cavity of the support panel 3. A feed inlet 8 penetrates the top of the outer surface of the flow guide box 5. By setting the placement plate 1, a stable installation and operation platform is provided for the entire injection molding machine, used to support the mold below and ensure its horizontal positioning. The first aluminum profile frame 2 and the second aluminum profile frame 4 together constitute the modular, lightweight, and highly rigid main support frame of the equipment. The first aluminum profile frame 2 bears the main vertical load, while the second aluminum profile frame 4 provides a precise installation reference for the upper conveying and driving unit. By setting the support panel 3 as the mounting base for the flow guide box 5 and the upper mechanism, the relative positional accuracy between the components is ensured. By setting up the flow guide box 5, a temporary storage, mixing, and conveying channel for the metal powder (the metal powder is barium tungsten cathode powder, and the core material of the barium tungsten cathode powder is tungsten powder) is formed. Its interior is smoothed to reduce powder adhesion and flow resistance. A feed inlet 8 serves as the inlet for adding the mixture of metal powder and binder, and is equipped with a valve to achieve intermittent feeding.

[0036] The conveying unit 6 is used to convey the metal powder and is located inside the guide box 5. The conveying unit 6 is the core power source driving the metal powder mixture from the storage area to the injection end, ensuring continuous, stable, and controllable material conveying.

[0037] The flow-diverting mechanism 7 is used to divert metal powder into the mold. The flow-diverting mechanism 7 is fixed at the bottom of the guide box 5. By setting the flow-diverting mechanism 7, the incoming material is evenly distributed to multiple injection heads, which is a key component for realizing simultaneous injection at multiple points in a mold with multiple cavities or for large parts.

[0038] The conveying unit 6 includes a connecting frame 61 and an agitation mechanism 69. The connecting frame 61 is fixed to the top of the second aluminum profile frame 4, and a stepper motor 62 is fixed to the inner wall of the connecting frame 61. The agitation mechanism 69 is located in the inner cavity of the guide box 5 and includes a rotating cylinder 692, which is rotatably connected to the inner cavity of the guide box 5. A spiral blade 695 is fixed to the outer surface of the rotating cylinder 692, and the spiral blade 695 is frictionally adapted to the inner wall of the guide box 5. The connecting frame 61 provides a stable and centered mounting support for the stepper motor 62. The core function of the agitation mechanism 69 is to continuously shear and agitate the material during the conveying process, preventing the powder and binder from segregating or settling, and ensuring the uniformity of the mixture. The main body of the conveying unit 6 is formed by setting up a rotating cylinder 692 and a spiral blade 695. The rotating cylinder 692 serves as a rotating shell, and the spiral blade 695 is welded to it. During the rotation, it generates axial thrust to achieve forced forward conveying of materials. At the same time, its tight fit with the inner wall of the guide box 5 effectively prevents material backflow.

[0039] A rotating rod 63 is mounted on the output end of the stepper motor 62 via a coupling. A first driving wheel 64 is fixed to the outer surface of the rotating rod 63, and a second driving wheel 65 is fixed to the bottom end of the rotating rod 63. A first rolling bearing 691 is fixed to the top of the outer surface of the rotating cylinder 692, and the first rolling bearing 691 is fixed to the top of the inner wall of the guide box 5. A first driven wheel 693 is fixed to the top of the rotating cylinder 692, and the first driven wheel 693 is connected to the second driving wheel 65 via a second belt 68. By setting the rotating rod 63, the first driving wheel 64, and the second driving wheel 65, a power output shaft and a primary speed change system are formed. The rotating rod 63 directly extracts the torque of the stepper motor 62. The first driving wheel 64 and the second driving wheel 65 are fixed to it with different diameters, providing a basis for achieving two different speed outputs. By setting the first rolling bearing 691, high-precision, low-friction radial support is provided for the top of the rotating cylinder 692, ensuring the stability of its rotation axis and being able to withstand the radial force generated by the helical blade 695 during operation. By setting the first driven pulley 693 and the second belt 68, a first-stage belt transmission system for driving the rotating drum 692 to rotate is formed. The second driving pulley 65 drives the first driven pulley 693 through the second belt 68, thereby transmitting power to the rotating drum 692. This transmission method has the functions of buffering, vibration reduction and easy adjustment of transmission ratio.

[0040] A second rolling bearing 696 is fixed to the inner wall of the rotating cylinder 692. A rotating column 67 is fixed to the inner ring of the second rolling bearing 696. A second driven wheel 697 is fixed to the top of the rotating column 67. The second driven wheel 697 is connected to the first driving wheel 64 via a first belt 66. By setting the second rolling bearing 696 inside the rotating cylinder 692, its core function is to provide independent and precise rotational support for the internal rotating column 67, allowing the rotating column 67 to operate independently of the rotating cylinder 692 at different speeds, which is key to achieving complex compound motion. By setting the rotating column 67 as the core drive shaft of the reciprocating motion mechanism, it receives power from the top and transmits it to the actuator at the bottom. By setting the second driven wheel 697 and the first belt 66, a second-stage belt drive system is formed to drive the rotation of the rotating column 67. The first driving wheel 64 drives the second driven wheel 697 through the first belt 66, thereby transmitting power to the rotating column 67. This transmission system is independent of the transmission system driving the rotating cylinder 692, allowing the speed of the two rotating components to be controlled separately.

[0041] A reciprocating lead screw 698 is fixedly mounted at the bottom end of the rotating column 67. A threaded ring 699 is threaded onto the outer surface of the reciprocating lead screw 698. A sliding tube 6910 is fixedly mounted on the outer surface of the threaded ring 699. Several evenly distributed raised strips are provided on the outer surface of the sliding tube 6910. Several evenly distributed grooves 694 are formed on the inner wall of the rotating cylinder 692. The raised strips on the outer surface of the sliding tube 6910 are slidably connected to the grooves 694. The reciprocating lead screw 698 is a lead screw with a special thread, which converts the continuous rotational motion of the rotating column 67 into the periodic reciprocating linear motion of the threaded ring 699 and the sliding tube 6910 along the axis. The threaded ring 699 acts as a nut for the reciprocating motion, precisely engaging with the reciprocating lead screw 698. The sliding tube 6910 and the raised strips on its outer surface are the actuators for the reciprocating motion, and the design of the raised strips enables it to transmit torque. The groove 694 on the inner wall of the rotating cylinder 692 forms a keyway with the protrusion of the sliding tube 6910. The key function of this structure is that it allows the sliding tube 6910 to slide axially back and forth relative to the rotating cylinder 692, but at the same time restricts the circumferential rotation between the two, that is, it forces the sliding tube 6910 to rotate synchronously with the rotating cylinder 692. This composite motion of "synchronous rotation + axial reciprocating" can produce a strong shearing, tumbling and axial pushing effect on the material, greatly enhancing the mixing and anti-clogging capabilities.

[0042] A conical barrel 6911 is fixedly mounted at the bottom end of the sliding tube 6910. The conical barrel 6911 is rotatably connected to the bottom of the inner cavity of the guide box 5. When the conical barrel 6911 is located at the bottom of the guide box 5, its outer surface is in frictional fit with the inner wall of the guide box 5. Several evenly distributed discharge grooves are formed on the outer surface of the conical barrel 6911. By setting the conical barrel 6911 as the terminal component of the agitation and conveying mechanism, its conical structure helps to collect material at the center of the bottom of the guide box 5. By fixing it to the bottom end of the sliding tube 6910, the conical barrel 6911 inherits the "rotation + reciprocating" compound motion of the sliding tube 6910. The frictional fit between its outer surface and the inner wall of the guide box 5 can form a temporary local seal when the reciprocating motion reaches the lower dead center, which is beneficial for pressurization and controlled discharge. The uniform discharge grooves on the surface of the cone 6911 are its core function: when the cone 6911 rotates, these grooves can scrape the material from the central area and convey it to the outer periphery; when it reciprocates, the volume change of the grooves can further promote material exchange and prevent bridging at the outlet, ensuring that the material can smoothly and controllably enter the diversion mechanism 7 below.

[0043] The flow distribution mechanism 7 includes a connecting cylinder 71, which is welded to the bottom opening of the guide box 5. A sliding cylinder 72 is slidably connected to the inner cavity of the connecting cylinder 71. A funnel 73 is welded to the bottom of the sliding cylinder 72, and a branch box 74 is welded to the bottom of the funnel 73. The branch box 74 is formed by merging two boxes with three internal channels. By setting the connecting cylinder 71, it serves as a fixed connection and transition component between the flow distribution mechanism 7 and the guide box 5, ensuring the continuity of the material flow channel. By setting the sliding cylinder 72, this component can slide up and down along the inner wall of the connecting cylinder 71. Its core function is to realize the overall lifting and lowering of the flow distribution mechanism 7, thereby adjusting the distance between the injection head and the mold gate during the injection cycle, and completing the action sequence of approach, injection, holding pressure, and retraction. By setting the funnel 73, it receives the material coming down from the guide box 5 and gathers it into the lower branch box 74. By setting up the branch box 74, its unique "double three-way" merging structure essentially constitutes a multi-channel distributor, which can evenly divide a single incoming flow into three independent branches. It is the core component for achieving efficient and synchronous multi-channel injection. Its internal flow channels are optimized to reduce flow resistance and pressure loss.

[0044] Injection tubes 76 are fixed to the three openings on the lower surface of the branch box 74. The diameter of the injection tubes 76 is the same as the diameter of the mold opening. A guide ball 77 is fixed to the interface of the inner cavity channel of the branch box 74. The inner cavity of the guide ball 77 is hollow. The bottom end of the injection tube 76 is located directly above the placement plate 1. By setting the injection tubes 76, the material enters the mold cavity as the final channel. Its diameter matches the mold gate, ensuring a tight seal and controlling the injection flow. Multiple injection tubes 76 allow multiple feed points of the mold to be filled simultaneously, shortening the filling time and improving the uniformity of product density. By setting the guide ball 77, installed at the intersection of the flow channels in the branch box 74, its spherical hollow inner cavity can greatly optimize the fluid turning performance, transforming the sharp turns of material flow into gentle gradual turns, effectively reducing dead angles, reducing pressure loss, and preventing powder from accumulating at corners, ensuring balanced flow in each branch channel.

[0045] A fixing bracket 78 is fixed to the outer side of the support panel 3, and a hydraulic cylinder 79 is fixed to the inner wall of the fixing bracket 78. An extrusion frame 75 is fixed to the outer surface of the branch box 74, and the movable end of the hydraulic cylinder 79 is fixed to the end of the extrusion frame 75. By setting the fixing bracket 78, a sturdy mounting support is provided for the hydraulic cylinder 79, ensuring that its thrust axis is consistent with the movement direction of the flow distribution mechanism 7. By setting the hydraulic cylinder 79 as the power source to drive the flow distribution mechanism 7 to perform lifting and lowering actions, its hydraulic drive mode can provide smooth, powerful and controllable linear thrust and pull, which is suitable for the slow and precise positioning required in injection molding. By setting the extrusion frame 75 as the connecting bridge between the piston rod of the hydraulic cylinder 79 and the branch box 74, the concentrated force of the hydraulic cylinder 79 is reliably transmitted and distributed to the structure of the branch box 74.

[0046] A support rod 710 is fixed to the outer surface of the branch box 74. A sliding ring 711 is fixed to the top of the support rod 710. A limiting rod 713 is fixed to the lower surface of the support panel 3. The sliding ring 711 is slidably connected to the outer surface of the limiting rod 713. A spring 712 is fixed to the lower surface of the sliding ring 711. The spring 712 is sleeved on the outer surface of the limiting rod 713, and the bottom end of the spring 712 is fixed to the bottom end of the limiting rod 713. By setting the support rod 710, sliding ring 711, limiting rod 713, and spring 712, a precision guiding and elastic reset / buffering system for the lifting and lowering movement of the flow divider mechanism 7 is formed. The support rod 710 connects the branch box 74 and the sliding ring 711. The sliding ring 711 and the limiting rod 713 form a high-precision linear bearing pair, ensuring that the flow divider mechanism 7 moves strictly in the vertical direction during the lifting and lowering process without shaking or deflection. This is crucial for the accurate alignment of the injection tube 76 and the mold gate. Spring 712 is sleeved on limit rod 713 and has multiple functions: first, it provides an upward elastic restoring force to assist the flow divider mechanism 7 in lifting quickly and smoothly when the cylinder 79 retracts; second, it plays a buffering role when the injection head presses down to contact the mold to avoid rigid impact; and third, it can balance part of the weight of the flow divider mechanism 7, making the control of cylinder 79 more precise.

[0047] Working principle: During use: The pre-mixed metal powder and binder mixture is added to the equipment through the feed inlet 8 at the top of the guide box 5. The guide box 5 serves as a temporary storage and buffer container for materials, and its smooth internal walls reduce material adhesion. At this time, the conveying unit 6 is in standby mode;

[0048] The stepper motor 62 of the conveying unit 6 is started. The stepper motor 62 drives the first drive wheel 64 and the second drive wheel 65 to rotate simultaneously via the rotating rod 63. Screw conveying: The second drive wheel 65 drives the first driven wheel 693 via the second belt 68, which in turn drives the rotating drum 692 to rotate. The spiral blades 695 fixed to the outer wall of the rotating drum 692 rotate accordingly, generating a continuous axial thrust on the material in the guide box 5, forcing it downwards and preventing bridging or stagnation of the material inside the box. Internal shearing and mixing: Simultaneously, the first drive wheel 64 drives the second driven wheel 697 via the first belt 66, driving the rotating column 67 located inside the rotating drum 692 to rotate independently. The reciprocating screw 698 at the bottom of the rotating column 67 rotates accordingly, driving the threaded ring 699 and the sliding tube 6910, which are threadedly engaged with it, to perform axial reciprocating motion. Since the sliding tube 6910 is bonded to the groove 694 on the inner wall of the rotating drum 692 via a protruding strip, it also rotates synchronously with the rotating drum 692. This "rotation + reciprocating" compound motion drives the cone 6911 at the bottom to generate strong shearing, tumbling and local compression, achieving secondary homogenization of the material, completely preventing the separation of powder and binder, and ensuring uniform material density, laying the foundation for subsequent precision injection.

[0049] When the material is conveyed to the bottom of the guide box 5, it enters the connecting cylinder 71 above the diversion mechanism 7 through the discharge chute of the cone 6911. Under the command of the control system, the hydraulic cylinder 79 is activated, and its piston rod pushes the entire diversion mechanism 7, including the sliding cylinder 72, funnel 73, branch box 74, and injection tube 76, downward along the limit rod 713 via the extrusion frame 75. The guiding and buffering system composed of the sliding ring 711 and the spring 712 ensures smooth movement and accurate centering. The pre-injection positioning is completed when the bottom ends of the multiple injection tubes 76 are closely aligned and slightly in contact with the corresponding gates of the mold placed on the placement plate 1 below.

[0050] After the diversion mechanism 7 is in place, the conveying unit 6, under the control of the stepper motor 62, switches to a precise metering conveying mode, continuously pushing a fixed amount of material into the diversion mechanism 7. The material first enters the funnel 73, and then flows into the branch box 74. Inside the branch box 74, a multi-channel structure optimized by the guide ball 77 evenly divides the incoming flow into three streams, which are then introduced into the respective injection tubes 76. Under the continuous action of the conveying pressure, multiple streams of material are simultaneously injected into the mold cavity through the injection tubes 76. During this process, the hydraulic cylinder 79 maintains a certain pressure to ensure the seal between the injection tube 76 and the mold gate. After the material fills the cavity, the system enters the pressure holding stage, where the conveying unit 6 maintains a small thrust to compensate for the material's cooling and shrinkage, ensuring that the parts are dense and defect-free.

[0051] Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A continuous injection molding machine for metal powder, comprising a placement plate (1), wherein a first aluminum profile frame (2) is fixedly provided at the corners of the upper surface of the placement plate (1), a support panel (3) is fixedly provided at the top of the first aluminum profile frame (2), a second aluminum profile frame (4) is fixedly provided at the side of the upper surface of the support panel (3), a flow guide box (5) is fixedly provided in the inner cavity of the support panel (3), and a feed inlet (8) is provided through the top of the outer surface of the flow guide box (5), characterized in that, Also includes: A conveying unit (6) is disposed in the inner cavity of the guide box (5); The diversion mechanism (7) is fixed to the bottom of the guide box (5); The conveying unit (6) includes a connecting frame (61) and an agitation mechanism (69). The connecting frame (61) is fixed at the top of the second aluminum profile frame (4). A stepper motor (62) is fixed on the inner wall of the connecting frame (61). The agitation mechanism (69) is located in the inner cavity of the guide box (5). The agitation mechanism (69) includes a rotating cylinder (692). The rotating cylinder (692) is rotatably connected to the inner cavity of the guide box (5). A spiral blade (695) is fixed on the outer surface of the rotating cylinder (692). The spiral blade (695) is frictionally adapted to the inner wall of the guide box (5). A second rolling bearing (696) is fixedly provided on the inner wall of the rotating cylinder (692), and a rotating column (67) is fixedly provided on the inner ring of the second rolling bearing (696). The bottom end of the rotating column (67) is fixedly provided with a reciprocating lead screw (698). The outer surface of the reciprocating lead screw (698) is threaded with a threaded ring (699). The outer surface of the threaded ring (699) is fixedly provided with a sliding tube (6910). The outer surface of the sliding tube (6910) is provided with a number of evenly distributed protrusions. The inner wall of the rotating cylinder (692) is provided with a number of evenly distributed grooves (694). The protrusions on the outer surface of the sliding tube (6910) are slidably connected to the grooves (694).

2. The continuous injection molding machine for metal powder according to claim 1, characterized in that: The output end of the stepper motor (62) is equipped with a rotating rod (63) via a coupling. A first driving wheel (64) is fixed on the outer surface of the rotating rod (63), and a second driving wheel (65) is fixed at the bottom end of the rotating rod (63). A first rolling bearing (691) is fixed on the top of the outer surface of the rotating cylinder (692). The first rolling bearing (691) is fixed on the top of the inner wall of the guide box (5). A first driven wheel (693) is fixed on the top end of the rotating cylinder (692). The first driven wheel (693) is connected to the second driving wheel (65) via a second belt (68).

3. A continuous injection molding machine for metal powder according to claim 2, characterized in that: The top of the rotating column (67) is fixed with a second driven wheel (697), which is connected to the first driving wheel (64) via a first belt (66).

4. A continuous injection molding machine for metal powder according to claim 3, characterized in that: The bottom end of the sliding tube (6910) is fixed with a cone (6911). The cone (6911) is rotatably connected to the bottom of the inner cavity of the guide box (5). When the cone (6911) is located at the bottom of the guide box (5), its outer surface is rubbed against the inner wall of the guide box (5). The outer surface of the cone (6911) is provided with several evenly distributed discharge grooves.

5. A continuous injection molding machine for metal powder according to claim 1, characterized in that: The diversion mechanism (7) includes a connecting cylinder (71), which is welded to the bottom opening of the guide box (5). A sliding cylinder (72) is slidably connected to the inner cavity of the connecting cylinder (71). A funnel (73) is welded to the bottom of the sliding cylinder (72), and a branch box (74) is welded to the bottom of the funnel (73). The branch box (74) is formed by merging two boxes with three channels inside.

6. A continuous injection molding machine for metal powder according to claim 5, characterized in that: Injection tubes (76) are fixed at the three openings on the lower surface of the branch box (74). The diameter of the injection tubes (76) is the same as the diameter of the mold opening. A guide ball (77) is fixed at the interface of the inner cavity channel of the branch box (74). The inner cavity of the guide ball (77) is hollow. The bottom end of the injection tube (76) is located directly above the placement plate (1).

7. A continuous injection molding machine for metal powder according to claim 6, characterized in that: A fixing frame (78) is fixed on the outer side of the support panel (3), and a hydraulic cylinder (79) is fixed on the inner wall of the fixing frame (78). A pressing frame (75) is fixed on the outer surface of the branch box (74), and the movable end of the hydraulic cylinder (79) is fixed at the end of the pressing frame (75).

8. A continuous injection molding machine for metal powder according to claim 7, characterized in that: A support rod (710) is fixed on the outer surface of the branch box (74). A sliding ring (711) is fixed at the top of the support rod (710). A limiting rod (713) is fixed on the lower surface of the support panel (3). The sliding ring (711) is slidably connected to the outer surface of the limiting rod (713). A spring (712) is fixed on the lower surface of the sliding ring (711). The spring (712) is sleeved on the outer surface of the limiting rod (713). The bottom end of the spring (712) is fixed to the bottom end of the limiting rod (713).

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