A powder pushing device for preventing powder segregation

Abstract

The utility model discloses a kind of powder pushing device for preventing powder segregation, comprising: fixed plate, drive unit, material box unit;Fixed plate is installed above the mould cavity of powder metallurgy full-automatic press, and there is through hole in corresponding place with mould cavity;Drive unit includes motor and push rod, and the output end of motor is connected with the one end of push rod, and the other end of push rod is fixedly connected material box;Material box unit includes material box and material box baffle, and material box top is open and bottom is open, for containing powder mixture to be pressed, material box baffle is vertically and fixedly installed in the inside of material box with equal interval, the inside of material box is divided into several chambers, material box moves to through hole under the drive of push rod, and powder falls from its bottom, fills into the mould cavity below.This application greatly inhibits macro flow and stratification of powder in material box due to vibration or movement, ensures the uniformity of composition.

Description

Technical Field

[0001] This utility model relates to the field of powder metallurgy technology, and in particular to a powder pushing device for preventing powder segregation. Background Technology

[0002] Powder metallurgy friction plates, as key transmission components in modern industry, are widely used in automotive braking systems, engineering machinery clutches, and other fields. Their performance directly affects the transmission efficiency, safety, and service life of equipment. In the production process of powder metallurgy friction plates, powder segregation has become a core issue restricting product quality consistency. Segregation refers to the separation of particles of different compositions, densities, or sizes in a mixed powder during conveying and pressing, resulting in localized deviations from the designed composition. This phenomenon leads to instability in the performance of the friction plate, and under high-speed, high-load conditions, it can easily cause safety hazards such as brake failure or transmission vibration.

[0003] Currently, the loading methods in the friction plate pressing process are mainly divided into two types: manual loading and automatic loading. Manual loading includes scraping loading and weighing loading. Common automatic loading methods include drop-in loading, suction loading, excess loading, zero-cavity loading, vibration loading, overfilling loading, underfilling loading, and dual-hopper loading. Studies have shown that in drop-in loading, high-density powder components are more likely to enter the mold cavity first due to their faster falling speed; conversely, low-density powder components are affected by the resistance generated by the outward expulsion of air from the mold cavity, resulting in a slower falling speed and even potential suspension and aggregation, leading to severe powder segregation. Suction loading is unaffected by air during powder descent.

[0004] In the production process of fully automated presses, traditional powder feeding devices have large material box capacities. During the vibration, conveying, and waiting processes, the powder is prone to segregation due to differences in particle size, density, and shape among its components. This means coarser, lighter particles float while finer, heavier particles sink. This results in inconsistent composition and density in products pressed sequentially, as well as in different areas of the same product, leading to increased scrap rates and decreased performance stability.

[0005] Referring to Japanese patent document JP2024088319A, entitled "Powder Feeder," this patent document discloses a powder feeder that moves back and forth above a mold during powder molding and pressing to fill the mold cavity with raw material powder. The feed box has an opening on the upper side for supplying raw material powder and an opening on the lower side; a shaft passes through at least one side wall of the feed box and extends in a direction approximately perpendicular to the front-back direction within a generally horizontal plane in the chamber of the feed box; stirring blades are mounted on the outer periphery of the shaft for stirring the raw material powder; and an actuator is mounted on the outer wall of the feed box for rotating the drive shaft. While this document installs stirring blades in the feed box to ensure uniform filling density, its structure is complex and difficult to maintain. Furthermore, the blades can only stir in vertical space, resulting in varying powder flowability at different locations and a tendency for segregation. Utility Model Content

[0006] To address the aforementioned technical problems, the purpose of this utility model is to provide a powder pushing device that prevents powder segregation. By vertically and equally spacedly fixing the material box partitions inside the material box, the macroscopic flow and stratification of powder caused by vibration or movement within the material box are greatly suppressed, ensuring the uniformity of the composition and solving technical problems such as uneven compact density and product performance fluctuations caused by powder segregation.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A powder pushing device for preventing powder segregation includes: a fixing plate, a driving unit, and a material box unit;

[0009] The fixing plate is installed above the mold cavity of the powder metallurgy fully automatic press, and a through hole is opened at the corresponding position of the mold cavity;

[0010] The drive unit includes a motor and a push rod. The output end of the motor is connected to one end of the push rod, and the other end of the push rod is fixedly connected to the material box. Driven by the motor, the push rod pushes the material box forward or backward in a straight line.

[0011] The material box unit includes a material box and a material box partition. The top of the material box is open and the bottom is open, and it is used to hold the powder mixture to be pressed. The material box partition is fixedly installed vertically and at equal intervals inside the material box, dividing the inside of the material box into several chambers. The material box moves to the through hole under the drive of the push rod, and the powder falls from its bottom and fills the mold cavity below.

[0012] In some embodiments, there is a preset gap between the bottom of the material box partition and the bottom surface of the material box.

[0013] In some embodiments, the preset gap between the bottom of the material box partition and the bottom surface of the material box is 10-20mm.

[0014] In some embodiments, the cassette partition has one or more through holes on each wall of each chamber.

[0015] In some embodiments, the material box partition has a circular through hole in the middle of each wall of each chamber.

[0016] In some embodiments, the width of each chamber is 80–130 mm.

[0017] In some embodiments, the material box partition is a stainless steel partition with a thickness of 1 to 3 mm.

[0018] In some embodiments, a guiding unit is further included. The guiding unit includes a first guide rail and a second guide rail, which are mounted parallel to each other on a fixed plate. A material box is disposed between the first guide rail and the second guide rail. Both the first guide rail and the second guide rail include an upper guide rail and a lower guide rail. Guide wheels are installed on both sides of the material box. The upper guide wheel cooperates with the upper guide rail, and the lower guide wheel cooperates with the lower guide rail. The lower guide rail is fixedly mounted on the fixed plate. A guide rail fixing block is also fixedly mounted on the fixed plate. The upper guide rail is supported on the guide rail fixing block, and the guide rail fixing block limits the left and right movement of the upper guide rail. A tension spring is installed between the upper guide rail and the fixed plate. One end of the tension spring is fixedly connected to the upper guide rail, and the other end is fixedly connected to the fixed plate.

[0019] In some embodiments, a guide rail fixing block is provided at both ends of each upper guide rail, the guide rail fixing block has a groove above it, and each upper guide rail has an extension rod at both ends. The extension rod is placed in the groove, one end of the tension spring is fixedly connected to the extension rod, and the other end is fixedly connected to the fixing plate.

[0020] In some embodiments, the material box unit further includes a material box cover, which may optionally cover the upper surface of the material box.

[0021] This utility model has the following beneficial effects:

[0022] This application utilizes a partition plate installed inside the powder box to divide the large volume of powder into multiple independent powder compartments. This significantly suppresses macroscopic flow and stratification of the powder within the powder box caused by vibration or movement, ensuring the uniformity of the composition. The pre-set gap between the bottom of the partition plate and the bottom surface of the powder box allows for smooth initial flow of the powder during the initial powder feeding process, avoiding compaction. The partition plate has one or more through holes on each wall of each compartment, which promotes micro-exchange and redistribution of the powder within each compartment during the powder feeding process. The combination of these two features effectively reduces local aggregation caused by differences in particle properties, thereby fundamentally ensuring the uniformity of the composition and solving technical problems such as uneven compact density and product performance fluctuations caused by powder segregation. Attached Figure Description

[0023] Figure 1This is a perspective view of a powder pushing device for preventing powder segregation in a fully automatic powder metallurgy press according to an embodiment of this utility model.

[0024] Figure 2 This is a structural schematic diagram of the material box and material box partition in an embodiment of this utility model;

[0025] Figure 3 yes Figure 1 Enlarged view at point A;

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Fixing plate; 2. Tension spring fixing screw; 3. Tension spring; 4. Guide rail fixing block; 5. First guide rail; 6. Second guide rail; 61. Lower guide rail; 62. Upper guide rail; 621. Extension rod; 7. Material box; 8. Cover plate; 9. Push rod; 10. Push rod guide rail fixing block; 11. Push rod guide rail; 12. Motor; 13. Guide wheel; 14. Guide wheel connecting rod; 15. Material box partition; 16. Push rod connector; 17. Push rod fixing component. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. It should be emphasized that the following description is merely exemplary and not intended to limit the scope and application of this utility model.

[0029] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component. Furthermore, a connection can be used for fixing, coupling, or communication.

[0030] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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 the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element 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 utility model.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] The present invention provides a powder pushing device for preventing powder segregation, comprising: a fixing plate 1, a driving unit, and a material box unit;

[0033] The fixing plate 1 is installed above the mold cavity of the powder metallurgy fully automatic press, and has a through hole at the corresponding position of the mold cavity;

[0034] The drive unit includes a motor 12 and a push rod 9. The output end of the motor 12 is connected to one end of the push rod 9, and the other end of the push rod 9 is fixedly connected to the material box 7. The push rod 9 pushes the material box 7 forward or backward in a straight line under the drive of the motor 12.

[0035] The material box unit includes a material box 7 and a material box partition 15. The material box 7 is open at the top and bottom, and is used to hold the powder mixture to be pressed. The material box partition 15 is vertically and evenly fixedly installed inside the material box 7, dividing the interior of the material box 7 into several chambers. Driven by the push rod 9, the material box 7 moves to the through hole, and the powder falls from its bottom, filling the mold cavity below. The powder metallurgy fully automatic press in this embodiment is a powder metallurgy friction plate fully automatic press.

[0036] In this embodiment, the material box 7 is a rectangular container with an open top and an open bottom, allowing powder to be filled into the mold cavity below. The powder pushing device is installed on the corresponding station of the fully automatic press via a fixing plate 1. The material box partition 15 divides the large volume of powder into multiple independent powder compartments, greatly suppressing the macroscopic flow and stratification of powder within the material box 7 caused by vibration or movement.

[0037] In this embodiment and some other embodiments, there is a preset gap between the bottom of the material box partition 15 and the bottom surface of the material box 7. In this embodiment, the preset gap between the bottom of the material box partition 15 and the bottom surface of the material box 7 is 10-20mm. The preset gap between the bottom of the partition and the bottom surface of the material box 7 allows the powder to flow smoothly in the initial stage of powder feeding, avoiding the phenomenon of compression.

[0038] In this embodiment and some other embodiments, the material box partition 15 has one or more through holes on each wall of each chamber, which can promote the micro-exchange and redistribution of powder in each compartment during the powder pushing process. In this embodiment, the material box partition 15 has a circular through hole in the middle of each wall of each chamber, which further improves the micro-exchange effect of powder in each compartment. The preset gap between the bottom of the partition and the bottom surface of the material box 7, combined with several circular holes in the middle of the partition, can effectively reduce local aggregation caused by differences in particle properties.

[0039] In this embodiment and some other embodiments, the width of each chamber is 80-130 mm, which can better suppress the macroscopic flow and stratification of powder.

[0040] In this embodiment and some other embodiments, the material box partition 15 is a stainless steel partition with a thickness of 1 to 3 mm, which makes the partition more durable.

[0041] In this embodiment, the material box partition 15 divides the inner cavity of the material box 7 into a series of grids with equal cross-sectional areas. The number of partitions can be determined according to the width of the material box 7 and the characteristics of the powder. The top edge of the partition is flush with the top of the material box 7. The lower part of the material box 7 is equipped with a polytetrafluoroethylene strip to ensure that the powder can be scraped cleanly when pushing the powder.

[0042] In this embodiment and some other embodiments, a guiding unit is also included. The guiding unit includes a first guide rail 5 and a second guide rail 6, which are installed in parallel on the fixed plate 1. The material box 7 is disposed between the first guide rail 5 and the second guide rail 6. Both the first guide rail 5 and the second guide rail 6 include an upper guide rail 62 and a lower guide rail 61. Guide wheels 13 are installed on both sides of the material box 7. The upper part of the guide wheel 13 cooperates with the upper guide rail 62, and the lower part of the guide wheel 13 cooperates with the lower guide rail 61. The lower guide rail 61 is fixedly installed on the fixed plate 1. A guide rail fixing block 4 is also fixedly installed on the fixed plate 1. The upper guide rail 62 is supported on the guide rail fixing block 4, and the guide rail fixing block 4 limits the left and right movement of the upper guide rail 62. A tension spring 3 is installed between the upper guide rail 62 and the fixed plate 1. One end of the tension spring 3 is fixedly connected to the upper guide rail 62, and the other end is fixedly connected to the fixed plate 1 to ensure that the material box 7 runs smoothly during the push of the push rod 9. Four tension spring fixing screws 2 are fixedly installed on the top surface of the fixing plate 1, corresponding to the tension springs 3 installed on the front and rear left and right sides of the fixing plate 1, for fixing one end of the tension springs 3. In this embodiment, the two sides of the material box 7 are connected to the guide wheel connecting rod 14 by threads, and the guide wheel 13 is fixed on the guide wheel connecting rod 14. The guide wheel 13 cooperates with the lower guide rail 61 and the upper guide rail 62 of the material box 7.

[0043] In this embodiment and some other embodiments, guide rail fixing blocks 4 are provided at both ends of each upper guide rail 62. Each guide rail fixing block 4 has a groove on its upper surface. Each upper guide rail 62 has an extension rod 621 at both ends, which is placed within the groove. One end of the tension spring 3 is fixedly connected to the extension rod 621, and the other end is fixedly connected to the fixing plate 1. The structure is simple, convenient, and easy to operate thanks to the extension rod 621 in conjunction with the guide rail fixing blocks 4 and the fixing spring.

[0044] In this embodiment, the drive unit includes a motor 12, a push rod 9, a push rod guide rail 11, and a push rod guide rail 11 fixing block 4. The push rod guide rail 11 fixing block 4 is fixedly installed on the rear end of the fixing plate 1, and the push rod guide rail 11 is fixedly installed on it. The extension direction of the push rod guide rail 11 is consistent with the extension direction of the guide unit. The motor 12 is precisely fixed to the rear side of the push rod guide rail 11 through the motor 12 mounting plate. One end of the push rod 9 is connected to the output end of the motor 12, and the other end of the push rod 9 is fixedly connected to the material box 7. The push rod 9 moves forward and backward along the push rod guide rail 11 under the drive of the motor 12. The push rod guide rail 11 guides and supports the reciprocating motion of the push rod 9. The front end of the push rod 9 is connected to the center of the rear side wall of the material box 7 through the push rod connector 16 and locked by the push rod fixing member 17. The push rod fixing member 17 includes screws and nuts to ensure effective power transmission.

[0045] In this embodiment and some other embodiments, a material box cover 8 is also included, which can optionally cover the upper surface of the material box 7. In this embodiment, the material box cover 8 is detachably connected to the upper surface of the material box 7 to prevent the raw materials from being contaminated and to prevent dust from being stirred up during the powder pushing process.

[0046] In this embodiment, the powder pushing device for preventing powder segregation in a fully automatic powder metallurgy press operates as follows: the powder-containing box 7 slides forward along the lower guide rail 61 and upper guide rail 62 under the drive of the push rod 9, moving to the through hole of the fixing plate 1, where the powder is filled from the bottom of the box 7 into the mold cavity below. After completion, the box 7 is reset under the drive of the motor 12.

[0047] The above description, in conjunction with specific / preferred embodiments, provides a further detailed explanation of the present invention and should not be construed as limiting the specific implementation of the present invention to these descriptions. For those skilled in the art, various substitutions or modifications can be made to these described embodiments without departing from the concept of the present invention, and all such substitutions or modifications should be considered within the protection scope of the present invention. In the description of this specification, the reference to terms such as "an embodiment," "some embodiments," "preferred embodiment," "example," "specific example," or "some examples," etc., indicates that the specific feature, structure, material, or characteristic described in connection with that embodiment or example 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 described specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples. Without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification and the features of different embodiments or examples. Although embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations may be made herein without departing from the scope of protection of the patent application.

Claims

1. A powder pushing device for preventing powder segregation, used in a fully automatic powder metallurgy press, characterized in that, include: Fixed plate (1), drive unit, material box unit; The fixing plate (1) is installed above the mold cavity of the powder metallurgy fully automatic press, and has a through hole at the corresponding position of the mold cavity; The drive unit includes a motor (12) and a push rod (9). The output end of the motor (12) is connected to one end of the push rod (9), and the other end of the push rod (9) is fixedly connected to the material box (7). The push rod (9) pushes the material box (7) forward or backward in a straight line under the drive of the motor (12). The material box unit includes a material box (7) and a material box partition (15). The material box (7) is open at the top and open at the bottom, and is used to hold the powder mixture to be pressed. The material box partition (15) is fixedly installed vertically and at equal intervals inside the material box (7), dividing the inside of the material box (7) into several chambers. The material box (7) moves to the through hole under the drive of the push rod (9), and the powder falls from its bottom and fills the mold cavity below.

2. The powder pushing device for preventing powder segregation as described in claim 1, characterized in that, There is a preset gap between the bottom of the material box partition (15) and the bottom surface of the material box (7).

3. The powder pushing device for preventing powder segregation as described in claim 2, characterized in that, The preset gap between the bottom of the material box partition (15) and the bottom surface of the material box (7) is 10-20mm.

4. A powder pushing device for preventing powder segregation as described in claim 1 or 2, characterized in that, The material box partition (15) has one or more through holes on each wall of each chamber.

5. The powder pushing device for preventing powder segregation as described in claim 4, characterized in that, The material box partition (15) has a circular through hole in the middle of each wall of each chamber.

6. The powder pushing device for preventing powder segregation as described in claim 1, characterized in that, Each chamber is 80–130 mm wide.

7. The powder pushing device for preventing powder segregation as described in claim 1, characterized in that, The material box partition (15) is a stainless steel partition with a thickness of 1 to 3 mm.

8. The powder pushing device for preventing powder segregation as described in claim 1, characterized in that, It also includes a guiding unit, which includes a first guide rail (5) and a second guide rail (6). The first guide rail (5) and the second guide rail (6) are installed parallel to each other on the fixed plate (1). The material box (7) is set between the first guide rail (5) and the second guide rail (6). The first guide rail (5) and the second guide rail (6) each include an upper guide rail (62) and a lower guide rail (61). Guide wheels (13) are installed on both sides of the material box (7). The guide wheels (13) cooperate with the upper guide rail (62) above. (13) The lower guide rail (61) is fitted with the lower guide rail (61). The lower guide rail (61) is fixedly installed on the fixed plate (1). The fixed plate (1) is also fixedly installed with a guide rail fixing block (4). The upper guide rail (62) is supported on the guide rail fixing block (4). The guide rail fixing block (4) limits the upper guide rail (62) to the left and right. A tension spring (3) is installed between the upper guide rail (62) and the fixed plate (1). One end of the tension spring (3) is fixedly connected to the upper guide rail (62), and the other end is fixedly connected to the fixed plate (1).

9. A powder pushing device for preventing powder segregation as described in claim 8, characterized in that, Each upper guide rail (62) has a guide rail fixing block (4) at both ends. The guide rail fixing block (4) has a groove on its upper end. Each upper guide rail (62) has an extension rod (621) at both ends. The extension rod (621) is placed in the groove. One end of the tension spring (3) is fixedly connected to the extension rod (621), and the other end is fixedly connected to the fixing plate (1).

10. The powder pushing device for preventing powder segregation as described in claim 1, characterized in that, The material box unit also includes a material box cover (8), which can optionally cover the upper surface of the material box (7).

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