Method and device for full-automatic rapid granulation and dry-pressing forming of powder

Abstract

The invention discloses a method and a device for full-automatic rapid granulation and dry pressing forming, and belongs to the technical field of powder pressing forming. Granulating the powder through electromagnetic vibration, and transferring the granulated powder to full-automatic dry-pressing molding equipment by using a mechanical arm for dry-pressing molding to obtain a green body with a designed shape; according to the invention, rapid full-automatic forming of multi-batch powder of small samples can be realized, technical support is provided for high-throughput all-solid-phase reaction experiment preparation, efficient and rapid design development or screening of materials is promoted, and meanwhile, a new way is provided for preparation of high-performance materials.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of high-throughput material preparation, and particularly relates to a method and device for full-automatic rapid granulation and dry pressing of powder. BACKGROUND

[0002] In recent years, material genetic engineering technology has developed rapidly, and mechanical arm series high-throughput full-process solid-phase synthesis preparation technology has emerged in an endless stream. Powder pressing and molding in the process of solid-phase reaction synthesis is an important link that hinders the preparation quality and efficiency. The traditional dry pressing and molding process uses granulation equipment and dry pressing and molding equipment, which needs to be manually operated, has low efficiency, and cannot be automatically matched with other links to realize automatic full-process preparation of solid-phase reaction synthesis. In addition, the existing equipment is relatively large in size, difficult to realize miniaturization and precision, and cannot meet the needs of variable conditions or small batch preparation.

[0003] Therefore, the application designs small granulation and tabletting equipment, transfers the powder between the equipment by the mechanical arm, realizes rapid full-automatic granulation and dry pressing of small batch powder samples under complex conditions, and can be highly matched with other full solid-phase reaction links, thereby laying a technical foundation for realizing full automation of the entire preparation process. SUMMARY

[0004] The application aims at the problems of large size, low efficiency, and inability to be compatible with high-throughput solid-phase reaction preparation technology of the traditional full-automatic dry pressing and molding equipment, adopts a mechanical arm to connect an electromagnetic vibration device and an automatic spraying device to granulate the powder, and then continuously and automatically dry presses and molds the granulated powder, so as to complete the full-automatic molding of small batch powder samples with multiple needs, and provide a technical foundation for realizing full-process automation of solid-phase reaction. The technical scheme of the application is beneficial to rapidly screening components and process parameters with optimal performance, shortening the research and development cycle of solid-phase reaction synthesized materials, and improving the research and development efficiency.

[0005] To achieve the above-mentioned purpose, the application provides a method and device for full-automatic rapid granulation and dry pressing of powder. The method for full-automatic rapid granulation and dry pressing of powder comprises the following steps:

[0006] The mechanical arm is used to place the powder in the box of the electromagnetic vibration device for high-frequency vibration, and the automatic spraying device is used to atomize and spray PVA aqueous solution for granulation. After completion, the mechanical arm is used to transfer the granulated powder to the hopper of the full-automatic dry pressing and molding device for automatic dry pressing and molding, so as to obtain a dense compact.

[0007] The powder material is ceramic powder or metal powder.

[0008] The high-frequency vibration adopts the electromagnetic vibration device, the frequency is 3 kHz, and the vibration time is 3-5 min.

[0009] The spraying binder is sprayed by using an automatic spraying device, the angle between the spraying head and the horizontal plane is 30-50°, and the spraying time is the same as the vibration time of the electromagnetic vibration device.

[0010] The spraying binder is a polyvinyl alcohol (PVA) aqueous solution with a mass fraction of 0.1-5 wt.%, the solution is synthesized by stirring PVA powder and deionized water in a water bath, the stirring temperature is 80-90 DEG C, the rotating speed is 300-500 rpm, and the stirring time is 3-4 h.

[0011] The application also provides a powder full-automatic rapid granulation dry-pressing forming device, which comprises an electromagnetic vibration device, an automatic spraying device and a full-automatic dry-pressing forming device.

[0012] The automatic spraying device comprises a liquid storage container (6), an electric compression atomizing machine (7), a multi-channel spraying head (8) and a mechanical arm connecting handle (9).

[0013] The mechanical arm comprises a six-axis mechanical arm (10) and an electric two-finger parallel clamping jaw (11).

[0014] The full-automatic dry-pressing forming device comprises a hopper (12), a mold mechanism, a horizontal transmission mechanism, a vertical stamping mechanism and a green body ejection mechanism.

[0015] The mold mechanism comprises a sliding mold cavity (13) and a pressing head (14).

[0016] The horizontal transmission mechanism comprises a horizontal displacement sliding rail (15) and a horizontal drive motor (16).

[0017] The vertical stamping mechanism comprises a vertical drive motor (17), a speed reducer (18), a pressure connecting rod (19), an upper pressing head (20) and a support frame (21).

[0018] The green body ejection mechanism comprises a drive motor (22) and a jacking column (23).

[0019] The application has the following beneficial effects:

[0020] The application uses a mechanical arm to pour ceramic powder or metal powder into the hopper of the electromagnetic vibration device for high-frequency vibration, and an automatic spraying device held by the mechanical arm sprays the prepared PVA solution on the powder for granulation.

[0021] The mechanical arm is connected with each automation device, the powder granulation and dry pressing forming process parameters can be accurately controlled, the error caused by manual operation is avoided, the accuracy and consistency of different batches of green body parameters are ensured, and the equipment operation has high stability and reliability.

[0022] The present application adopts the method of electromagnetic high-frequency vibration and spraying of binder to ensure that the powder surface uniformly and appropriately adheres to the binder, which is beneficial to the green body after powder dry pressing forming to have good mechanical strength, appropriate fluidity and better uniformity, thereby improving the forming quality of the sample and providing a basis for sintering into a dense sample. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The powder full-automatic rapid granulation dry pressing forming device provided by the embodiment of the present application is a whole side view structural schematic diagram.

[0024] Figure 2 The powder full-automatic rapid granulation dry pressing forming device provided by the embodiment of the present application is a whole side view structural schematic diagram. DETAILED DESCRIPTION

[0025] The present application will be described in detail below with reference to the drawings of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0026] In the description of the present application, if the orientation description such as "up", "down", "front", "back", "left", "right" and the like is referred to, the orientation or position relationship shown in the drawings is referred to, and only for the convenience of describing the present application and simplifying the description, and it is not intended to indicate or imply that the device or element referred to must have a particular orientation, and a particular orientation configuration and operation, therefore it cannot be understood as a limitation of the present application.

[0027] EMBODIMENT

[0028] The embodiment of the present application provides a powder full-automatic rapid granulation dry pressing forming method and device. Figure 1 , Figure 2 As shown in the powder full-automatic rapid granulation dry pressing forming device, the powder full-automatic rapid granulation dry pressing forming device comprises a mechanical arm, an electromagnetic vibration device, an automatic spraying device and a full-automatic dry pressing forming device.

[0029] The mechanical arm is a six-axis mechanical arm (10), and the head thereof comprises an electric two-finger parallel gripper (11). The automatic spraying device comprises a connecting handle (9) for mechanical arm gripping, an electric liquefier (7), a liquid storage container (6) and a multi-channel spray head (8). The electromagnetic vibration device comprises a material box (1), a vibrating plate (2), an iron block (3), an electromagnetic coil (4) and a base and support (5). The fully-automatic dry-pressing forming device comprises a hopper (12), a mold mechanism, a horizontal transmission mechanism, a vertical punching mechanism and a green body ejection mechanism, wherein the mold mechanism comprises a sliding mold cavity (13) and a lower pressing head (14), the horizontal transmission mechanism comprises a horizontal displacement sliding rail (15) and a horizontal drive motor (16), and the vertical punching mechanism comprises a vertical drive motor (17), a speed reducer (18), a pressure connecting rod (19), an upper pressing head (20) and a support frame (21). The green body ejection mechanism comprises a drive motor (22) and a jacking column (23).

[0030] As shown in the specific placement area, Figure 2 The mechanical arm is placed in the left area, the fully-automatic dry-pressing forming device, the automatic spraying device and the electromagnetic vibration device are placed in the right area, close to the front end electric two-finger parallel gripper (11) of the mechanical arm, so that the mechanical arm has sufficient operation space.

[0031] The embodiment of the present application also provides a powder fully-automatic rapid granulation dry-pressing forming method, which comprises the following steps: the mechanical arm pours the powder into the material box (1) of the electromagnetic vibration device; under the driving of high-frequency alternating current, the electromagnetic coil (4) generates a high-frequency changing magnetic field, drives the iron block (3) and the vibrating plate (1) to vibrate at high frequency, so as to cause the powder to vibrate. Then, the mechanical arm grabs the connecting handle (9) of the automatic spraying device, the electric liquefier (7) of the automatic spraying device is opened, the PVA aqueous solution in the liquid storage container (6) is continuously sprayed through the multi-channel spray head (8) to the material box (1) of the electromagnetic vibration device at an angle of 45° for 30 s, and the powder granulation process is completed. Then, the mechanical arm returns the automatic spraying device to the original position, takes down the material box and pours the granulated powder in the material box into the hopper (12) of the fully-automatic dry-pressing forming device. The granulated powder fills the mold cavity (13) through the hopper and is in a certain loose state. The mold mechanism is controlled by the horizontal displacement motor (16) to move rightwards through the horizontal displacement sliding rail (15) to the upper pressing head (20) of the vertical punching mechanism, the upper pressing head (20) is driven by the vertical drive motor (17) through the speed reducer (18) to press at a constant speed, until the powder is pressed into a certain thickness and dense body. Then, the upper pressing head (17) is lifted, and the pressing process is completed. The horizontal transmission mechanism continues to move the mold cavity (13) to the green body ejection mechanism, the jacking column (23) is driven by the drive motor (22) to push the lower pressing head to eject the pressed green body piece from the mold, and the whole fully-automatic dry-pressing forming process is completed.

Claims

1. A fully automatic rapid powder granulation and dry pressing molding device, characterized in that, The device includes: a robotic arm, an electromagnetic vibration device, an automatic spraying device, and a fully automatic dry pressing molding device.

2. The fully automatic rapid powder granulation and dry pressing device according to claim 1, characterized in that, The robotic arm is a six-axis robotic arm (10), and its head includes an electrically powered two-finger parallel gripper (11).

3. The fully automatic rapid powder granulation and dry pressing device according to claim 2, characterized in that, The automatic spraying device includes a robotic arm for gripping and connecting handles (9), an electric liquefaction unit (7), a liquid storage container (6), and a multi-channel nozzle (8).

4. The fully automatic rapid powder granulation and dry pressing device according to claim 3, characterized in that, The electromagnetic vibration device includes a material box (1), a vibration plate (2), an iron block (3), an electromagnetic coil (4), and a base and support (5).

5. The fully automatic rapid powder granulation and dry pressing device according to claim 4, characterized in that, The fully automatic dry pressing molding device includes a hopper (12), a mold mechanism, a horizontal transmission mechanism, a vertical stamping mechanism, and a green billet ejection mechanism.

6. The fully automatic rapid powder granulation and dry pressing device according to claim 5, characterized in that, The mold mechanism includes a sliding mold cavity (13) and a lower pressure head (14); the horizontal transmission mechanism includes a horizontal displacement slide rail (15) and a horizontal drive motor (16); the vertical stamping mechanism includes a vertical drive motor (17), a reducer (18), a pressure connecting rod (19), an upper pressure head (20), and a support frame (21); the green blank ejection mechanism includes a drive motor (22) and an ejector column (23).

7. A method for fully automated rapid granulation and dry pressing of powder, characterized in that, The method is implemented using the device described in any one of claims 1-6. The method includes: a robotic arm pouring powder into the material box (1) of the electromagnetic vibration device; under the drive of high-frequency alternating current, the electromagnetic coil (4) generates a high-frequency changing magnetic field, which drives the iron block (3) and the vibration plate (1) to vibrate at high frequency, thereby causing the powder to vibrate. Subsequently, the robotic arm grabs the connecting handle (9) of the automatic spraying device, and the electric liquefaction machine (7) of the automatic spraying device will be turned on. The PVA aqueous solution is sprayed from the storage container (6) through the multi-channel nozzle (8) onto the material box (1) of the electromagnetic vibration device at an angle of 45° for 30 seconds to complete the powder granulation process. Next, the robotic arm returns the automatic spraying device to its original position, removes the material box, and pours the granulated powder into the hopper (12) of the fully automatic dry pressing molding device. The granulated powder is filled into the mold cavity (13) by the hopper and is in a certain loose state; The mold mechanism is controlled by a horizontal displacement motor (16) to move to the right via a horizontal displacement slide rail (15) to directly above the upper pressure head (20) of the vertical stamping mechanism. The upper pressure head (20) is driven by a vertical drive motor (17) via a reducer (18) to press down at a uniform speed until the powder is pressed into a blank of a certain thickness and density. Then the upper pressure head (17) is lifted, and the pressing process is completed; the horizontal transmission mechanism continues to move the mold cavity (13) to the green blank ejection mechanism, and the drive motor (22) drives the top column (23) to push the lower pressure head to eject the pressed green blank from the mold, thus completing the entire fully automatic dry pressing process.

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