Reduced iron powder forming device

Abstract

The invention relates to the technical field of powder forming equipment, and particularly discloses a reduced iron powder forming device. The device comprises a heat preservation storage bin, a drying assembly, an impurity removal assembly, a mixing assembly and a forming cylinder, a movable forming mold and an overturning quantitative plate are arranged in the forming cylinder, and a rotary disc with a mold hole is arranged at the end of the forming cylinder; a movable forming mold and a separation sheet are arranged opposite to the turntable; and the movable forming mold is connected with a demolding block. The discharging unit, the forming unit, the demolding unit, the conveying unit and other procedures are integrated, conveying connection is achieved through a closed channel, materials do not need to be transferred in a segmented mode, loss and secondary pollution are reduced, meanwhile, the production period is greatly shortened, and the production efficiency is improved; meanwhile, dust escape can be effectively controlled, the dust emission rate is reduced to 0.2% or below, and the environment-friendly requirement is met.

Description

Technical Field

[0001] This invention relates to the field of powder forming equipment technology, and in particular to a reduced iron powder forming device. Background Technology

[0002] Reduced iron powder, due to its high purity and good formability, is widely used in powder metallurgy, machinery manufacturing, magnetic materials, and other fields. Its forming process is a core step in the subsequent preparation of finished products, mainly relying on cold pressing to achieve the cold pressing of iron powder. Existing reduced iron powder forming equipment suffers from several problems in practical use: First, the feeding process often uses direct-fall feeding, which easily leads to iron powder accumulation and uneven feeding, resulting in inconsistent density and reduced precision of the formed parts. Second, the inner wall of the mold lacks a dedicated anti-sticking structure, causing iron powder to easily stick to the mold during demolding, affecting not only the appearance of the formed parts but also wasting raw materials. Third, while cold pressing equipment does not require heating equipment and has a relatively simple structure, the resulting blank has low density and poor compressive strength, making it prone to delamination and cracking, requiring subsequent sintering treatment. Although hot pressing equipment can improve the density and strength of the blank, the heating and pressing processes are independent, resulting in significant heat loss. Furthermore, parameters such as raw material feed rate, temperature, and pressure are difficult to control precisely, leading to poor dimensional consistency and high energy consumption in the finished product. Meanwhile, existing equipment mostly adopts a single-path feeding and pressing structure, which cannot achieve continuous production. Furthermore, the pretreatment of reduced iron powder (such as drying, impurity removal, and mixing) is not closely connected with the molding process, requiring multiple equipment to operate in steps. This not only increases equipment investment and floor space, but also reduces raw material utilization and finished product qualification rate due to losses and secondary pollution during material transfer. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, this invention provides a reduced iron powder forming device that achieves seamless integration of reduced iron powder pretreatment and forming processes, improves parameter control accuracy and forming continuity, enhances precision, balances finished product quality and production efficiency, and reduces energy consumption and raw material loss.

[0004] This invention is achieved through the following technical solution: A reduced iron powder forming device includes a PLC control system and a feeding unit, a forming unit, a demolding unit, and a conveying unit. The feeding unit includes an insulated storage silo, a drying component, a purification component, and a mixing component connected in sequence. The insulated storage silo is equipped with a pneumatic discharge valve, and the drying component is located below the insulated storage silo. The forming unit includes a horizontal forming cylinder installed at the lower end of the mixing component. One end of the forming cylinder is equipped with a first forming cylinder, and the output end of the first forming cylinder is equipped with a movable forming mold that extends into the forming cylinder. A tilting metering plate is provided inside the forming cylinder via a torsion spring. The other end of the forming cylinder is equipped with a turntable with several rotating... The unit includes a mold hole directly opposite the forming cylinder; it also includes a second forming cylinder, which is positioned on both sides of the turntable with the first forming cylinder. The output end of the second forming cylinder is connected to a movable forming mold, which has a separating plate that can be inserted into the mold hole. The demolding unit includes a demolding module that moves synchronously with the movable forming mold. When the separating plate is inserted into the mold hole, the demolding module is simultaneously inserted into another adjacent mold hole. The conveying unit includes a conveyor belt, which consists of a lifting section and a horizontal section. The lower end of the lifting section is located below the demolding unit. The feeding unit, forming unit, demolding unit, and conveying unit are all controlled by a PLC control system.

[0005] The drying assembly adopts a fluidized bed drying structure, and its interior is equipped with a medium-frequency induction heating coil and an airflow disturbance device.

[0006] The impurity removal component is equipped with a magnetic screen and a vibration device. The magnetic screen is tilted and has an impurity collection box below it.

[0007] The mixing component is equipped with a twin-helix agitator and a temperature sensor. The mixing component is equipped with a binder adding mechanism at its feed end.

[0008] The insulated storage silo is equipped with a constant temperature jacket and a stirring device. The inner wall of the forming cylinder, the movable forming mold, the flipping metering plate, the inner wall of the mold hole, the moving forming mold, and the separation plate are all coated with a polytetrafluoroethylene anti-stick coating.

[0009] It also includes a shielding groove, which is engaged on the turntable and located between the movable forming mold and the demolding mold; the shielding groove is fixedly connected to the forming cylinder.

[0010] Two damping plates are provided on the shielding groove by a torsion spring. The damping plates are located on the side facing the conveyor belt and on the movement trajectory of the detachment module. A support plate is provided below the two damping plates.

[0011] It also includes a stepper motor, the output end of which is provided with several radially distributed inclined support rods, which are fixedly connected to the turntable.

[0012] The beneficial effects of this invention are: This invention integrates the feeding unit, forming unit, demolding unit, and conveying unit into one unit, and connects them through a closed channel, eliminating the need for separate material transfer, reducing material loss and secondary pollution, and significantly shortening the production cycle and improving production efficiency. The drying, impurity removal, and mixing functions of the feeding unit work together to effectively improve the purity and molding compatibility of the reduced iron powder raw material, laying the foundation for high-quality molding in the future.

[0013] The drying assembly of this invention employs an inert gas protection and airflow disturbance drying structure, which improves drying efficiency while preventing secondary oxidation of reduced iron powder.

[0014] The present invention provides a flipping metering plate inside the forming cylinder. By forming a metering space with the movable forming mold through the flipping metering plate, the density of the reduced iron powder after forming can be guaranteed to be consistent, achieving uniformity and density.

[0015] The demolding unit of the present invention is also equipped with a damping plate, which facilitates the slow placement of the molded reduced iron powder block onto the conveyor belt during demolding, thus avoiding damage to the conveyor belt.

[0016] The present invention is equipped with a stirring device in both the insulated storage silo and the mixing component, which can prevent material accumulation and uneven material distribution, resulting in molded parts with consistent density and improved precision.

[0017] The present invention coats the inner wall of the forming cylinder, the movable forming mold, the flipping metering plate, the inner wall of the mold hole, the moving forming mold, and the separation plate with a polytetrafluoroethylene anti-stick coating, which has a good anti-stick effect and avoids the reduced iron powder from sticking to the mold.

[0018] This invention adopts a fully enclosed production process, which can effectively control dust escape and reduce the dust emission rate to below 0.2%, meeting environmental protection requirements. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the connection structure of the present invention; Figure 2 This is a cross-sectional view of an insulated storage silo. Figure 3 This is a cross-sectional view of the impurity removal component. Figure 4 for Figure 1 Enlarged structural diagram at point A; Figure 5 for Figure 4 A partial top-view structural diagram along the B-axis; Figure 6 for Figure 4 A partial top-view structural diagram along the C-axis; Figure 7 for Figure 1 A schematic diagram of the left-side structure of the turntable; Figure 8 This is a cross-sectional view of the forming cylinder during the extrusion molding process (with the reduced iron powder forming block removed).

[0020] In the diagram, 1 is the insulated storage silo, 2 is the constant temperature jacket, 3 is the stirring device, 4 is the pneumatic unloading valve, 5 is the drying component, 6 is the airflow disturbance device, 7 is the impurity removal component, 8 is the magnetic screen, 9 is the vibration device, 10 is the impurity collection box, 11 is the mixing tank, 12 is the storage tank, 12 is the metering pump, 14 is the forming cylinder, 15 is the first forming cylinder, 16 is the movable forming mold, 17 is the flipping metering plate, 18 is the turntable, 19 is the stepper motor, 20 is the inclined support rod, 21 is the mold hole, 22 is the shielding groove, 23 is the second forming cylinder, 24 is the moving forming mold, 25 is the separating plate, 26 is the demolding plate, 27 is the damping plate, 28 is the pallet, 29 is the conveyor belt, 291 is the lifting section, 292 is the horizontal section, and 293 is the baffle. Detailed Implementation

[0021] The attached figures illustrate specific embodiments of the present invention.

[0022] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0023] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0024] like Figures 1 to 8 As shown, this reduced iron powder forming device includes a PLC control system, and the entire system is controlled by the PLC control system; it includes a feeding unit, a forming unit, a demolding unit, and a conveying unit; wherein, The feeding unit includes an insulated storage silo 1, a drying component 5, a cleaning component 7, and a mixing component.

[0025] The insulated storage silo 1 is equipped with a constant temperature jacket 2 and a stirring device 3. Heat transfer oil can be circulated through the constant temperature jacket 2 to maintain the temperature of the reduced iron powder in the insulated storage silo 1 at 100℃. The stirring device 3 is driven by a variable frequency motor with a speed adjustable to 100 rpm to prevent the reduced iron powder from clumping. A pneumatic discharge valve 4 is installed at the bottom of the insulated storage silo 1. The drying assembly 5 adopts a fluidized bed drying structure and is located below the insulated storage silo 1. It contains a medium-frequency induction heating coil and an airflow disturbance device 6. The airflow disturbance device 6 uses a high-pressure blower to introduce nitrogen into the drying chamber through an air duct, creating airflow disturbance and ensuring full contact between the reduced iron powder and the heating coil. The feed end of the drying assembly 5 is connected to the pneumatic discharge valve 4 through a conveying pipe, and the discharge end is connected to the impurity removal assembly 7. The drying assembly 5 controls the moisture content of the reduced iron powder to 1.5%. wt% (weight percentage); The impurity removal component 7 is equipped with a magnetic screen 8 and a vibration device 9. The magnetic screen 8 is tilted at an angle of 30°, and an impurity collection box 10 is located below it. The vibration device 9 drives the magnetic screen 8 to vibrate, adsorbing and separating ferromagnetic impurities in the reduced iron powder. Non-magnetic impurities slide down the screen to the impurity collection box 10. The mixing component includes a mixing tank 11, which is equipped with a double helical stirring paddle and a temperature sensor. The double helical stirring paddle adopts an anti-rotation structure and the stirring speed is 120 r / min. The feed end of the mixing component is connected to a binder adding mechanism. The binder adding mechanism includes a storage tank 12 and a metering pump 13. The metering pump 13 controls the binder addition amount to 2wt% according to the feed amount of reduced iron powder to achieve uniform mixing of binder and reduced iron powder.

[0026] The forming unit includes: a horizontal forming cylinder 14 fixedly installed at the lower end of the mixing component, i.e., the lower end of the mixing tank 11. The inner cavity of the forming cylinder 14 has the same shape as the reduced iron powder forming block. A first forming cylinder 15 (or a hydraulic cylinder) is installed on the extension line of one end of the forming cylinder 14. The output end of the first forming cylinder 15 is fixedly connected to a movable forming mold 16, which is located inside the forming cylinder 14. A flipping metering plate 17 is hinged inside the forming cylinder 14 by a torsion spring. The flipping metering plate 17 and the movable forming mold 16 are located on opposite sides of the outlet of the mixing tank 11. The reduced iron powder in the cavity formed between the two is the total amount used in the final product. After the flipping metering plate 17 is flipped, its surface is flush with the inner wall of the forming cylinder 14 to ensure the smooth movement of the movable forming mold 16.

[0027] At the other end of the forming cylinder 14 is a turntable 18, which is driven to rotate by a stepper motor 19. Several radially distributed inclined support rods 20 are fixedly installed at the output end of the stepper motor 19, and the inclined support rods 20 are fixedly installed with the turntable 18. Several radially distributed mold holes 21 are opened on the turntable 18, and the mold holes 21 face the forming cylinder 14 after rotating to the top.

[0028] A blocking groove 22 is fixedly installed at one end of the forming cylinder 14 that contacts the turntable 18. The blocking groove 22 is stuck on the turntable 18. The blocking groove 22 can cover two adjacent mold holes 21. However, a hole needs to be made in the blocking groove 22 to expose the mold hole 21.

[0029] A second forming cylinder 23 (or hydraulic cylinder) is installed above the stepper motor 19. The second forming cylinder 23 and the first forming cylinder 15 are located on opposite sides of the turntable 18 and are on the same straight line. A movable forming mold 24 is fixedly installed at the output end of the second forming cylinder 23. Two separating plates 25 are fixedly installed on the side of the movable forming mold 24 facing the turntable 18. The two separating plates 25 can be inserted into the mold hole 21 and press against the end of the forming cylinder 14. At this time, the cross-section of the cavity formed by the separating plates 25, the mold hole 21 and the movable forming mold 24 is exactly the same as the cross-section of the forming cylinder 14.

[0030] To facilitate the insertion of the separating piece 25 into the mold hole 21, the end of the mold hole 21 facing the second forming cylinder 23 can be configured as a flared shape.

[0031] The demolding unit includes a demolding module 26, which is also fixedly connected to the output end of the second forming cylinder 23 and moves synchronously with the moving forming mold 24. When the separating plate 25 is inserted into the mold hole 21, the demolding module 26 is simultaneously inserted into another adjacent mold hole 21, pushing the reduced iron powder forming block of the mold hole 21 away from the mold hole 21. Two damping plates 27 are installed on the blocking groove 22 corresponding to the mold hole 21 by a torsion spring. The damping plates 27 are located on the movement trajectory of the demolding module 26. During the process of the demolding module 26 pushing the reduced iron powder forming block, the damping plates 27 clamp the reduced iron powder forming block, which plays a buffering and limiting role, preventing it from falling heavily onto the conveyor belt 29.

[0032] A support plate 28 is provided below the two damping plates 27.

[0033] The inner wall of the forming cylinder 14, the movable forming mold 16, the flipping metering plate 17, the inner wall of the mold hole 21, the movable forming mold 24, and the separation plate 25 are respectively coated with polytetrafluoroethylene anti-stick coating to facilitate demolding. The coating thickness is 0.05-0.1mm, which has a good anti-stick effect and avoids iron powder sticking to the mold.

[0034] The conveying unit includes a conveyor belt 29, which consists of a lifting section 291 and a horizontal section 292. The entire conveyor belt 29 is located opposite the detachment module 26, and the lower end of the lifting section 291 is located below the pallet 28.

[0035] Baffles 293 can also be installed on the conveyor belt 29 to drive the reduced iron powder forming blocks to be lifted.

[0036] All electrical equipment in the feeding unit, forming unit, demolding unit, and conveying unit is controlled by a PLC control system.

[0037] The active forming die 16 is relatively long, and it can still block the lower outlet of the mixing tank 11 when it is in the extrusion forming process.

[0038] The work process is as follows: The PLC control system is started, relevant parameters are set, and reduced iron powder is sent into the insulated storage silo 1. Heat transfer oil is introduced into the constant temperature jacket 2. The temperature is maintained by the heat transfer oil and the stirring device 3 to prevent agglomeration. The powder is sent into the drying component 5 through the pneumatic discharge valve 4. The medium frequency induction heating coil is heated, and nitrogen is introduced by the high pressure blower to form airflow disturbance, reducing the moisture content to 1.5wt%. Then it enters the impurity removal component 7. The vibration device 9 drives the magnetic screening screen 8 to vibrate and separate impurities. The pure reduced iron powder enters the mixing component and is evenly mixed with the binder delivered by the metering pump 13 by the double spiral stirring paddle.

[0039] The mixed reduced iron powder falls into the forming cylinder 14. The reduced iron powder located between the flipping metering plate 17 and the movable forming mold 16 is the raw material for a reduced iron powder forming block. At this time, the mold hole 21 on the turntable 18 is directly opposite the forming cylinder 14. The second forming cylinder 23 is activated, and the separating plate 25 is inserted into the mold hole 21 and presses against the end of the forming cylinder 14. There is no gap between the movable forming mold 24 and the mold hole 21. Then, the first forming cylinder 15 is activated, pushing the reduced iron powder. The flipping metering plate 17 flips and sticks to the top of the forming cylinder 14. The first forming cylinder 15 then pushes the reduced iron powder... The raw iron powder is pushed between two separating plates 25 and extruded into shape. Then, the first forming cylinder 15 and the second forming cylinder 23 are retracted to their original positions to wait for operation. The flipping metering plate 17 returns to its original position, the turntable 18 rotates, and the die hole 21 carrying the reduced iron powder forming block rotates to the position facing the release module 26. The above actions are repeated. While the next reduced iron powder forming block is being extruded and formed, the release module 26 drives the reduced iron powder forming block away from the die hole 21. Under the damping action of the two damping plates 27, it slowly falls onto the conveyor belt 29. This process is repeated continuously.

[0040] In this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can mean a fixed connection, a detachable connection, or an integral connection; "link" can mean a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0042] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0043] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0044] Apart from the technical features described in the specification, all other technical features are known to those skilled in the art.

Claims

1. A reduced iron powder forming device, comprising a PLC control system, characterized in that, It also includes a feeding unit, a forming unit, a demolding unit, and a conveying unit. The feeding unit includes a thermal insulation storage silo (1), a drying component (5), a cleaning component (7), and a mixing component connected in sequence. The thermal insulation storage silo (1) is equipped with a pneumatic discharge valve (4), and the drying component (5) is located below the thermal insulation storage silo (1). The forming unit includes a horizontal forming cylinder (14) installed at the lower end of the mixing component. One end of the forming cylinder (14) is equipped with a first forming cylinder (15). The output end of the first forming cylinder (15) is equipped with a movable forming mold (16) that extends into the forming cylinder (14). The forming cylinder (14) is equipped with a flipping metering plate (17) through a torsion spring. The other end of the forming cylinder (14) is equipped with a turntable (18). The turntable (18) is equipped with several mold holes (21) that face the forming cylinder (1) after rotation. It also includes a second forming unit. The first molding cylinder (15) and the second molding cylinder (23) are arranged on both sides of the turntable (18). The output end of the second molding cylinder (23) is connected to the moving molding mold (24). The moving molding mold (24) is provided with a separating piece (25) that can be inserted into the mold hole (21). The demolding unit includes a demolding module (26) that moves synchronously with the moving molding mold (24). When the separating piece (25) is inserted into the mold hole (21), the demolding module (26) is simultaneously inserted into another adjacent mold hole (21). The conveying unit includes a conveyor belt (29). The conveyor belt (29) is composed of a lifting section (291) and a horizontal section (292). The lower end of the lifting section (291) is located below the demolding unit. The feeding unit, molding unit, demolding unit and conveying unit are controlled by a PLC control system.

2. The reduced iron powder forming apparatus according to claim 1, characterized in that, The drying component (5) adopts a fluidized bed drying structure, and is equipped with a medium-frequency induction heating coil and an airflow disturbance device (6) inside.

3. The reduced iron powder forming apparatus according to claim 1, characterized in that, The impurity removal component 7 is equipped with a magnetic screening screen (8) and a vibration device (9). The magnetic screening screen (8) is inclined and an impurity collection box (10) is provided below it.

4. The reduced iron powder forming apparatus according to claim 1, characterized in that, The mixing component is equipped with a twin-helix agitator and a temperature sensor.

5. The reduced iron powder forming apparatus according to claim 1, characterized in that, The mixing component is equipped with a binder adding mechanism at its feed end.

6. The reduced iron powder forming apparatus according to claim 1, characterized in that, The insulated storage silo (1) is equipped with a constant temperature jacket (2) and a stirring device (3).

7. The reduced iron powder forming apparatus according to claim 1, characterized in that, The inner wall of the forming cylinder (14), the movable forming mold (16), the flipping metering plate (17), the inner wall of the mold hole (21), the movable forming mold (2), and the separation plate (25) are respectively coated with polytetrafluoroethylene anti-stick coating.

8. The reduced iron powder forming apparatus according to claim 1, characterized in that, It also includes a shielding groove (22), which is locked on the turntable (18) and located between the movable forming mold (24) and the demolding mold (26), and the shielding groove (22) is fixedly connected to the forming cylinder (14).

9. The reduced iron powder forming apparatus according to claim 8, characterized in that, Two damping plates (27) are provided on the shielding groove (22) by a torsion spring. The damping plates (27) are located on the side facing the conveyor belt (29) and on the movement trajectory of the detachment module (26). A support plate (28) is provided below the two damping plates (27).

10. The reduced iron powder forming apparatus according to claim 1, characterized in that, It also includes a stepper motor (19), the output end of which is provided with several radially distributed inclined support rods (20), and the inclined support rods (20) are fixedly connected to the turntable (18).

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