Mixing and granulating integrated device for metal injection molding

Abstract

The utility model relates to the technical field of mixing granulation, and specifically discloses a mixing granulation integrated device for metal injection molding, which comprises a mixer and a screw extruder connected to the bottom of the mixer, further comprises a feeding mechanism arranged on the top of the mixer and a machine base installed on the bottom of the screw extruder, a protection mechanism is installed on one side of the machine base, a granulating mechanism corresponding to the outlet end of the screw extruder is arranged in the protection mechanism, and a pelletizing mechanism is installed on the protection mechanism; wherein the granulating mechanism comprises a first head connected to the discharge end of the screw extruder and a second head connected to one side of the first head, and an extrusion hole is arranged in the first head, the utility model gradually cools the extruded strip-shaped material through the water injection cavity, the circulation cavity and other gradual cooling systems in the granulating mechanism, so that the strip-shaped material is quickly cooled and shaped, and then cut by a pelletizing rod after hardening, thereby avoiding plastic deformation under high temperature.

Description

Technical Field

[0001] This utility model relates to the field of compounding and granulation technology, specifically to an integrated compounding and granulation device for metal injection molding. Background Technology

[0002] The integrated mixing and granulation device is used to uniformly and efficiently mix metal powder with binders (usually high molecular weight polymers and plasticizers, etc.) and directly extrude the mixed agglomerated material into granules of uniform size that are easy to use for subsequent injection molding.

[0003] A nylon compounding extruder, with patent publication number CN218286289U, includes a support base, a compounding box, and a granulation plate. Several legs are fixedly mounted on the lower surface of the support base, and a reducer is fixedly mounted on one end of the upper surface of the support base. A first servo motor is driven to the outer surface of the reducer, and a spiral discharge pipe is driven to the output end of the reducer. A support rod is fixedly mounted at the bottom of the compounding box, with its bottom end welded to the support base. A feed inlet is connected to one side of the top of the compounding box. A mixing mechanism is installed on the compounding box, and the bottom of the compounding box is connected to the top of the spiral discharge pipe via a discharge pipe, on which a valve is installed. Raw materials are extruded from granulation holes on the granulation plate and rotated by a third servo motor. The rotating shaft drives a cutting blade to rotate, causing the cutting blade to cut the nylon extruded from the granulation holes, thus facilitating nylon granulation.

[0004] In the aforementioned extruder, mixing and extrusion granulation are performed directly, followed by hot pelletizing. However, the pelletizing effect is poor. The raw material is directly extruded from the pelletizing holes of the pelletizing plate without cooling, remaining in a high-temperature, high-plasticity state. Direct cutting with a cutting blade at this temperature causes the hot material to adhere to the blade, resulting in pellets sticking together and affecting the quality of the finished product. To address these issues, an integrated mixing and pelletizing device for metal injection molding is proposed. Utility Model Content

[0005] The purpose of this invention is to provide an integrated mixing and granulation device for metal injection molding, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An integrated mixing and granulation device for metal injection molding includes a mixing mill and a screw extruder connected to the bottom of the mixing mill. It also includes a feeding mechanism located at the top of the mixing mill and a base installed at the bottom of the screw extruder. A protective mechanism is installed on one side of the base. The protective mechanism has a granulation mechanism corresponding to the outlet end of the screw extruder. A pelletizing mechanism is installed on the protective mechanism.

[0008] The pelletizing mechanism includes a first die head connected to the discharge end of the screw extruder and a second die head connected to one side of the first die head. The first die head is provided with an extrusion hole, and an extrusion tube placed inside the second die head and communicating with the extrusion hole is connected to one side of the first die head. The second die head is provided with a discharge hole corresponding to the extrusion tube. The second die head is provided with a water injection chamber for the introduction of cooling liquid, and the first die head is provided with a circulation chamber for the introduction of cooling liquid. The circulation chamber is connected to the water injection chamber through a water passage.

[0009] In one alternative: the second die head is provided with a water injection pipe communicating with the water injection chamber, and the first die head is provided with a water outlet pipe communicating with the circulation chamber, wherein the circulation chamber is not communicating with the extrusion hole.

[0010] In one alternative: the protective mechanism includes a protective box and a discharge port connected to the bottom of the protective box, the bottom of the protective box is connected to a support frame, and the protective box is provided with an arc-shaped plate installed on the side of the second machine head away from the first machine head.

[0011] In one alternative embodiment: the pelletizing mechanism includes a drive source and a central column. The drive source is installed on the outside of the protective box. The annular outer wall of the central column is connected to four sets of pelletizing rods that contact one side of the second die head. One side of the central column is connected to the power output end of the drive source via a telescopic rod.

[0012] In one alternative embodiment: the telescopic rod includes a movable rod connected to one side of the central column and a positioning sleeve connected to the power output end of the drive source. The movable rod extends slidably into the positioning sleeve and is connected to a spring disposed within the positioning sleeve. The end of the movable rod extending into the positioning sleeve is connected to a limiting block. The positioning sleeve is provided with a limiting groove for sliding of the limiting block, thereby limiting the relative rotation between the movable rod and the positioning sleeve.

[0013] In one alternative: the feeding mechanism includes a support box and a feeding box connected to one side of the support box. The bottom of the feeding box is connected to the support box through a feeding port. A sealing block is slidably disposed inside the support box. A cylinder is connected to the top of the support box, and the piston rod at the bottom of the cylinder is connected to the top of the sealing block.

[0014] In one alternative: the bottom of the support box is connected to the feed end of the mixer, and the height of the sealing block is greater than the height of the feed inlet.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] In this invention, the extruded strip material is rapidly cooled and shaped by a gradual cooling system, including a water injection chamber and a circulation chamber, in the pelletizing mechanism. This hardens the material before it is cut by the pelletizing rod, thus avoiding plastic deformation at high temperatures.

[0017] In this invention, the feeding mechanism, the mixing machine, and the screw extruder provide stable conveying, which, together with the extrusion hole and extrusion tube of the first die head, ensure that the strip material is extruded at a uniform speed and with a consistent shape, thus providing a stable foundation for subsequent pelleting.

[0018] The pelletizing mechanism of this application uses a telescopic rod to achieve lateral floating of the pelletizing rod, which can compensate for the processing errors of the second die head and the discharge hole, or adapt to slight positional deviations during material extrusion, and ensure stable cutting position. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] Figure 2 This is a schematic diagram of the feeding mechanism in this utility model.

[0021] Figure 3 This is a schematic diagram of the internal structure of the protective mechanism in this utility model.

[0022] Figure 4 This is a schematic diagram of the granulation mechanism in this utility model.

[0023] Figure 5 This is a schematic diagram of the structure of the circulation chamber in this utility model.

[0024] Figure 6 This is a schematic diagram of the pelletizing mechanism in this utility model.

[0025] In the diagram: 1. Mixing machine; 2. Feeding mechanism; 3. Screw extruder; 4. Machine base; 5. Protective mechanism; 6. Pelletizing mechanism; 7. Pelletizing mechanism; 201. Support box; 202. Feed box; 203. Feed inlet; 204. Sealing block; 205. Cylinder; 501. Protective box; 502. Discharge outlet; 503. Support frame; 504. Arc plate; 601. First die head; 602. Second die head; 603. Extrusion hole; 604. Extrusion tube; 605. Discharge hole; 606. Water injection chamber; 607. Water injection pipe; 608. Water passage hole; 609. Circulation chamber; 610. Water outlet pipe; 701. Drive source; 702. Central column; 703. Pelletizing rod; 704. Positioning sleeve; 705. Movable rod; 706. Spring. Detailed Implementation

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figures 1-6 In this embodiment, the integrated mixing and granulation device for metal injection molding includes a mixer 1 and a screw extruder 3 connected to the bottom of the mixer 1. It also includes a feeding mechanism 2 set at the top of the mixer 1 and a base 4 installed at the bottom of the screw extruder 3. A protective mechanism 5 is installed on one side of the base 4. The protective mechanism 5 is provided with a granulation mechanism 6 corresponding to the outlet end of the screw extruder 3. A pelletizing mechanism 7 is installed on the protective mechanism 5. The screw extruder 3 receives the mixture output from the mixer 1, and conveys the mixture forward through the rotation of the screw in the barrel. At the same time, it further compacts and plasticizes the mixture and applies a certain pressure so that the mixture enters the granulation mechanism 6 through the discharge end at the end of the screw with a stable flow rate and pressure.

[0029] The pelletizing mechanism 6 includes a first die head 601 connected to the discharge end of the screw extruder 3 and a second die head 602 connected to one side of the first die head 601. The first die head 601 is provided with an extrusion hole 603. An extrusion tube 604, which is placed in the second die head 602 and communicates with the extrusion hole 603, is connected to one side of the first die head 601. The second die head 602 is provided with a discharge hole 605 corresponding to the extrusion tube 604. The second die head 602 is provided with a water injection chamber 606 for the introduction of cooling liquid. The first die head 601 is provided with a circulation chamber 609 for the introduction of cooling liquid. The circulation chamber 609 communicates with the water injection chamber 606 through a water passage 608. The mixture conveyed by the screw extruder 3 first enters the first die head 601, enters the extrusion tube 604 through the extrusion hole 603, and is then extruded from the discharge hole 605 of the second die head 602 to form a continuous strip-shaped material.

[0030] Please see Figure 2The second head 602 is provided with a water injection pipe 607 that communicates with the water injection chamber 606, and the first head 601 is provided with a water outlet pipe 610 that communicates with the circulation chamber 609. The circulation chamber 609 is not connected to the extrusion hole 603.

[0031] Specifically, cooling liquid can be injected into the water injection chamber 606 through the water injection pipe 607. The cooling liquid flows in the water injection chamber 606 to cool the material in the extrusion pipe 604. Then, it enters the circulation chamber 609 through the water passage 608 to cool the material flowing in the extrusion hole 603. The temperature of the cooling liquid in the circulation chamber 609 is higher than that of the cooling liquid in the water injection chamber 606, which can gradually cool the material, improve the material forming effect, and facilitate subsequent pelleting.

[0032] Please see Figure 2 The protective mechanism 5 includes a protective box 501 and a discharge port 502 connected to the bottom of the protective box 501. The bottom of the protective box 501 is connected to a support frame 503. The protective box 501 is provided with an arc-shaped plate 504 installed on the side of the second machine head 602 away from the first machine head 601.

[0033] Specifically, the arc-shaped plate 504 can protect the material during pelletizing by the pelletizing structure 7, and the extruded material is cut into pellets and output from the discharge port 502.

[0034] Please see Figure 2 The pelletizing mechanism 7 includes a drive source 701 and a central column 702. The drive source 701 is installed on the outside of the protective box 501. The annular outer wall of the central column 702 is connected to four sets of pelletizing rods 703 that contact one side of the second head 602. One side of the central column 702 is connected to the power output end of the drive source 701 through a telescopic rod. The drive source 701 is a combination of an existing motor and a coupling or a reducer.

[0035] Specifically, the drive source 701 drives the telescopic rod to rotate, thereby driving the central column 702 to rotate, and the pelletizing rod 703 rotates to perform the pelletizing operation.

[0036] Please see Figure 2 The telescopic rod includes a movable rod 705 connected to one side of the central column 702 and a positioning sleeve 704 connected to the power output end of the drive source 701. The movable rod 705 slides into the positioning sleeve 704 and is connected to a spring 706 disposed within the positioning sleeve 704. A limiting block is connected to the end of the movable rod 705 extending into the positioning sleeve 704. The positioning sleeve 704 is provided with a limiting groove for sliding of the limiting block, which is used to limit the relative rotation between the movable rod 705 and the positioning sleeve 704.

[0037] Specifically, during pelleting, the moving rod 705 will float laterally within a certain range due to the action of the spring 706. If the hardness of the strip material or the extrusion speed fluctuates slightly during pelleting, the pelletizing rod 703 will be subjected to different degrees of impact. The elasticity of the spring 706 can buffer these impact loads, reduce the force impact on the pelletizing rod 703 and the drive source 701, extend the service life of the components, and avoid damage to the components due to rigid collisions.

[0038] Please see Figure 2 The feeding mechanism 2 includes a support box 201 and a feeding box 202 connected to one side of the support box 201. The bottom of the feeding box 202 is connected to the support box 201 through a feeding port 203. A blocking block 204 is slidably disposed inside the support box 201. A cylinder 205 is connected to the top of the support box 201. The piston rod at the bottom of the cylinder 205 is connected to the top of the blocking block 204. Furthermore, the bottom of the support box 201 is connected to the feeding end of the mixer 1, and the height of the blocking block 204 is greater than the height of the feeding port 203.

[0039] Specifically, the cylinder 205 adjusts the blocking block 204 to rise, allowing material to be fed from the top of the feed box 202. The material can enter the support box 201 from the feed inlet 203, and then enter the mixer 1 for mixing. After feeding is completed, the blocking block 204 can be adjusted to fall, blocking the feed inlet 203 and preventing material from splashing during mixing in the mixer 1.

[0040] The working principle of this utility model is as follows: The starting cylinder 205 drives the sealing block 204 to move upward, opening the feed inlet 203. The metal powder and binder mixture in the feed box 202 enters the mixer 1 through the support box 201. After reaching the set feed amount, the cylinder 205 drives the sealing block 204 to move downward, closing the feed inlet 203. The mixer 1 starts, and the internal rotor rotates, shearing and stirring the raw materials to ensure uniform mixing and plasticization. The mixed material then enters the screw extruder 3. The rotating screw conveys and compacts the mixture forward, stabilizing the pressure and flow rate. The cooling liquid is conveyed to the first die head 601 of the pelletizing mechanism 6. It enters the water injection chamber 606 of the second die head 602 through the water injection pipe 607, and then enters the circulation chamber 609 of the first die head 601 through the water passage 608 to cool the mixture in the die head. The mixture is extruded from the discharge hole 605 through the extrusion hole 603 and the extrusion pipe 604 to form a shaped strip material. The cooling liquid is finally discharged from the water outlet pipe 610. The drive source 701 is started, which drives the central column 702 and the pelletizing rod 703 to rotate. The cut particles are discharged from the discharge port 502, completing the entire mixing and granulation process.

[0041] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A compounding and granulation integrated device for metal injection molding, comprising a compounding mill (1) and a screw extruder (3) connected to the bottom of the compounding mill (1), characterized in that, It also includes a feeding mechanism (2) set on the top of the mixer (1) and a base (4) installed at the bottom of the screw extruder (3). A protective mechanism (5) is installed on one side of the base (4). A pelletizing mechanism (6) corresponding to the discharge end of the screw extruder (3) is provided inside the protective mechanism (5). A pelletizing mechanism (7) is installed on the protective mechanism (5). The pelletizing mechanism (6) includes a first die head (601) connected to the discharge end of the screw extruder (3) and a second die head (602) connected to one side of the first die head (601). The first die head (601) is provided with an extrusion hole (603). An extrusion tube (604) is connected to one side of the first die head (601) and is placed in the second die head (602) and communicates with the extrusion hole (603). The second die head (602) is provided with a discharge hole (605) corresponding to the extrusion tube (604). The second die head (602) is provided with a water injection chamber (606) for the insertion of cooling liquid. The first die head (601) is provided with a circulation chamber (609) for the insertion of cooling liquid. The circulation chamber (609) is communicated with the water injection chamber (606) through a water passage (608).

2. The integrated mixing and granulation apparatus for metal injection molding according to claim 1, characterized in that: The second head (602) is provided with a water injection pipe (607) that communicates with the water injection chamber (606), and the first head (601) is provided with a water outlet pipe (610) that communicates with the circulation chamber (609). The circulation chamber (609) is not connected to the extrusion hole (603).

3. The integrated mixing and granulation apparatus for metal injection molding according to claim 1, characterized in that: The protective mechanism (5) includes a protective box (501) and a discharge port (502) connected to the bottom of the protective box (501). The bottom of the protective box (501) is connected to a support frame (503). The protective box (501) is provided with an arc-shaped plate (504) installed on the side of the second machine head (602) away from the first machine head (601).

4. The integrated mixing and granulation apparatus for metal injection molding according to claim 3, characterized in that: The pelletizing mechanism (7) includes a drive source (701) and a central column (702). The drive source (701) is installed on the outside of the protective box (501). The annular outer wall of the central column (702) is connected to four sets of pelletizing rods (703) that contact one side of the second head (602). One side of the central column (702) is connected to the power output end of the drive source (701) through a telescopic rod.

5. The integrated mixing and granulation apparatus for metal injection molding according to claim 4, characterized in that: The telescopic rod includes a movable rod (705) connected to one side of the central column (702) and a positioning sleeve (704) connected to the power output end of the drive source (701). The movable rod (705) slides into the positioning sleeve (704) and is connected to a spring (706) disposed in the positioning sleeve (704). The end of the movable rod (705) extending into the positioning sleeve (704) is connected to a limiting block. The positioning sleeve (704) is provided with a limiting groove for sliding of the limiting block, which is used to limit the relative rotation between the movable rod (705) and the positioning sleeve (704).

6. The integrated mixing and granulation apparatus for metal injection molding according to claim 1, characterized in that: The feeding mechanism (2) includes a support box (201) and a feeding box (202) connected to one side of the support box (201). The bottom of the feeding box (202) is connected to the support box (201) through the feeding port (203). A sealing block (204) is slidably arranged inside the support box (201). A cylinder (205) is connected to the top of the support box (201). The piston rod at the bottom of the cylinder (205) is connected to the top of the sealing block (204).

7. The integrated mixing and granulation apparatus for metal injection molding according to claim 6, characterized in that: The bottom of the support box (201) is connected to the feed end of the mixer (1), and the height of the sealing block (204) is greater than the height of the feed inlet (203).

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