A mixing device for producing polyimide powder

Abstract

The utility model discloses a kind of mixing devices for polyimide powder production, including support seat;Mixing box, fixedly installed on support seat;Box cover, through sealing gasket cover in the top of mixing box, and box cover is installed with feed hopper and passes through;Lifting mechanism, installed in the top of support seat, through the setting of mixing mechanism, compared with traditional single stirring structure, greatly increase the stirring range and stirring intensity, several groups of stirring rods installed on two groups of rotary rods in mixing mechanism can be stirred from different directions, different positions to the polyimide powder in mixing box, make powder form complex and ordered flow state in box, fully break the agglomeration and stratification phenomenon between powder, realize more uniform mixing, whether it is larger or particle size distribution wider polyimide powder of viscosity, can reach ideal mixing effect under this all-round stirring effect, to ensure the consistency and stability of final product performance.

Description

Technical Field

[0001] This utility model relates to the field of polyimide powder production technology, specifically a mixing device for polyimide powder production. Background Technology

[0002] Polyimide, as a high-performance polymer material, has been widely used in many high-tech fields such as aerospace, electronics, microelectronics, and automobile manufacturing due to its excellent high-temperature resistance, low-temperature resistance, radiation resistance, high strength, and good insulation properties. In the actual production process of polyimide, the main purpose of the mixing operation is to fully mix polyimide powders of different batches, different compositions, or different pretreatments to ensure that the various components are evenly distributed, thereby ensuring the consistency and reliability of the final product. However, existing polyimide powder mixing devices have revealed many problems in practical applications and are difficult to meet the strict requirements of high-quality production.

[0003] Many devices employ only a single stirring structure, resulting in insufficient flow and mixing of powder within the mixing chamber. This can easily lead to uneven mixing in certain areas, especially for polyimide powders with high viscosity or wide particle size distribution. A single stirring method is insufficient to achieve ideal mixing results, thus affecting product performance and quality stability. Furthermore, the ease of cleaning and maintenance of the mixing device is also a crucial factor affecting production efficiency and product quality. In some traditional devices, the connection between the cover and the mixing chamber is complex, and the opening and closing process is cumbersome, making it inconvenient to regularly clean and inspect the interior of the device. Therefore, we need to propose a mixing device for polyimide powder production. Utility Model Content

[0004] The purpose of this invention is to provide a mixing device for polyimide powder production, which brings significant benefits in terms of mixing effect, powder cleaning, ease of operation and production efficiency. It effectively solves many problems existing in the prior art and provides a strong guarantee for the high-quality production of polyimide powder, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A mixing apparatus for producing polyimide powder includes a support base; The mixing box is fixedly installed on the support base; The lid is sealed to the top of the mixing box by a gasket, and a feed hopper is installed through the lid; The lifting mechanism, installed on top of the support base, is used to lift the lid of the box. The mixing mechanism, installed on the box cover, is used to mix and stir the polyimide powder inside the mixing box. An auxiliary scraping mechanism, installed on the box cover, is used to assist in scraping the material from the inner wall of the mixing box.

[0006] Preferably, the lifting mechanism includes a fixed frame, which is fixedly installed on the top of the support base. An electric hydraulic rod is fixedly installed on the inner top of the fixed frame. The top of the telescopic end of the electric hydraulic rod passes through the top wall of the fixed frame and is fixedly connected to a connecting plate. A connecting frame is fixedly installed on the top of the connecting plate, and one end of the connecting frame is fixedly installed to the top of the box cover.

[0007] Preferably, the fixing frame has guide rods slidably inserted on both sides of the electro-hydraulic rod, and the tops of the two sets of guide rods are fixedly connected to the bottom of the connecting plate.

[0008] Preferably, the mixing mechanism includes two sets of rotating rods, both sets of rotating rods are symmetrically mounted on the box cover via bearings, and pulleys are fixedly sleeved on the top of each set of rotating rods. The two sets of pulleys are connected by belt drive, and a drive motor is connected to the top of one set of rotating rods. Several sets of stirring rods are fixedly installed on the outer wall of each set of rotating rods.

[0009] Preferably, the box cover is fixedly mounted on a mounting bracket above the two sets of pulleys, the drive motor is fixedly mounted on the top of the mounting bracket, and the output shaft of the drive motor passes through the mounting bracket and is fixedly mounted on the top of one of the sets of rotating rods.

[0010] Preferably, the auxiliary scraping mechanism includes two sets of cylinders, which are symmetrically fixedly installed on the top of the box cover. One end of the telescopic end of the two sets of cylinders passes through the box cover and is fixedly connected to a connecting block. The opposite sides of the two sets of connecting blocks are jointly fixedly connected to an annular scraper, and the outer wall of the annular scraper is in contact with the inner wall of the mixing box.

[0011] Preferably, the bottom of the mixing box is fixedly connected to a discharge pipe, and a solenoid valve is provided on the outer wall of the discharge pipe.

[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model, through the setting of a mixing mechanism, greatly increases the mixing range and mixing force compared to the traditional single stirring structure. The mixing mechanism has several sets of stirring rods installed on two sets of rotating rods, which can stir the polyimide powder in the mixing box from different directions and positions, so that the powder forms a complex and orderly flow state in the box, which fully breaks the agglomeration and stratification of the powder, and achieves more uniform mixing. Whether the polyimide powder has high viscosity or wide particle size distribution, it can achieve the ideal mixing effect under this all-round stirring action, thereby ensuring the consistency and stability of the final product performance. 2. This utility model, through the setting of the lifting mechanism, can drive the lid to open and close automatically. Compared with the traditional complicated connection method, this design greatly simplifies the operation process of the lid, reduces the manual intervention, and reduces labor intensity. At the same time, after the lid is raised, it is convenient to clean the mixing mechanism on the lid and clean the inside of the mixing box, thereby avoiding cross-contamination between different batches of products and ensuring the purity and quality stability of the products. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention viewed from the front; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This is a schematic diagram of the lifting mechanism of this utility model; Figure 4 This is a schematic diagram of the structure of the box cover and mixing mechanism of this utility model.

[0014] In the diagram: 1. Support base; 2. Mixing box; 3. Box cover; 4. Lifting mechanism; 41. Fixing frame; 42. Electro-hydraulic rod; 43. Connecting plate; 44. Connecting frame; 45. Guide rod; 5. Feed hopper; 6. Mixing mechanism; 61. Rotating rod; 62. Pulley; 63. Drive motor; 64. Stirring rod; 65. Mounting frame; 7. Auxiliary scraping mechanism; 71. Cylinder; 72. Connecting block; 73. Annular scraper; 8. Discharge pipe; 9. Solenoid valve. Detailed Implementation

[0015] 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.

[0016] Please see Figure 1-4 This utility model provides a technical solution: A mixing device for producing polyimide powder includes a support base 1; The mixing box 2 is fixedly installed on the support base 1; The lid 3 is sealed to the top of the mixing box 2 by a sealing gasket, and the feed hopper 5 is installed through the lid 3; The lifting mechanism 4 is installed on the top of the support base 1 and is used to lift the box cover 3. The mixing mechanism 6 is installed on the box cover 3 and is used to mix and stir the polyimide powder inside the mixing box 2. The auxiliary scraping mechanism 7 is installed on the box cover 3 and is used to assist in scraping the inner wall of the mixing box 2.

[0017] The support base 1 is made of cast iron and has an anti-slip pad at the bottom to enhance the overall stability of the equipment; the inner wall of the mixing box 2 is mirror polished to reduce powder adhesion; the sealing gasket between the box cover 3 and the mixing box 2 is made of wear-resistant silicone to ensure the sealing during mixing and prevent dust leakage; the top of the feed hopper 5 is equipped with a sealing cover.

[0018] In an optional embodiment: the lifting mechanism 4 includes a fixed frame 41, which is fixedly installed on the top of the support base 1. An electric hydraulic rod 42 is fixedly installed on the inner top of the fixed frame 41. The top of the telescopic end of the electric hydraulic rod 42 passes through the top wall of the fixed frame 41 and is fixedly connected to a connecting plate 43. A connecting frame 44 is fixedly installed on the top of the connecting plate 43. One end of the connecting frame 44 is fixedly installed on the top of the box cover 3.

[0019] It should be noted that the stroke of the electro-hydraulic rod 42 can be precisely adjusted by the control system to meet the needs of fully or partially opening the lid 3. The connecting frame 44 is made of high-strength alloy steel to ensure stable force distribution when the lid 3 is raised or lowered. The electro-hydraulic rod 42 in the lifting mechanism 4 can precisely control the raising and lowering of the connecting plate 43 and the connecting frame 44, thereby driving the lid 3 to automatically open and close. Compared with the traditional complex connection method, this design greatly simplifies the operation process of the lid 3. The electro-hydraulic drive has a large output force and runs smoothly, enabling the automatic raising and lowering of the lid 3 and reducing the intensity of manual operation. Compared with pneumatic lifting, hydraulic control has higher precision and can avoid the sealing failure of the lid 3 due to vibration.

[0020] In an optional embodiment: the fixing frame 41 is slidably inserted with guide rods 45 on both sides of the electro-hydraulic rod 42, and the top of both sets of guide rods 45 are fixedly connected to the bottom of the connecting plate 43.

[0021] It should be noted that the guide rod 45 is chrome-plated and has a linear bearing between it and the sliding hole of the fixing frame 41 to ensure that there is no jamming during the lifting process. The length of the guide rod 45 is longer than the maximum stroke of the electric hydraulic rod 42 to prevent it from disengaging from the sliding hole during lifting. The double-sided guide design effectively counteracts the eccentric force when the box cover 3 is lifted, prevents the electric hydraulic rod 42 from deforming due to unilateral force, and ensures the sealing accuracy of the box cover 3 and the mixing box 2, thereby improving the sealing reliability.

[0022] In an optional embodiment: the mixing mechanism 6 includes two sets of rotating rods 61, both sets of rotating rods 61 are symmetrically mounted on the box cover 3 through bearings, the top of each set of rotating rods 61 is fixedly sleeved with a pulley 62, the two sets of pulleys 62 are connected by belt drive, and the top of one set of rotating rods 61 is connected to a drive motor 63, and several sets of stirring rods 64 are fixedly mounted on the outer wall of each set of rotating rods 61.

[0023] It should be noted that the distance between the two sets of rotating rods 61 is half the inner diameter of the mixing box 2. The stirring rod 64 adopts a propeller-type structure (the shape of the stirring rod 64 in the attached diagram is only for reference). The upper and lower stirring rods are tilted in opposite directions (the upper layer is tilted 30° clockwise, and the lower layer is tilted 30° counterclockwise). The pulley 62 and the belt are driven by a synchronous belt (instead of an ordinary belt). The symmetrically arranged double rotating rods 61, together with the oppositely tilted stirring rods 64, can form a mixing flow field of vertical convection, avoiding the stratification phenomenon caused by the uniform density of polyimide powder. The synchronous belt drive ensures that the two sets of rotating rods 61 rotate at the same speed, further improving the mixing uniformity. Driven by the drive motor 63, the two sets of rotating rods 61 rotate synchronously. Through the several sets of stirring rods 64 installed on the two sets of rotating rods 61, the polyimide powder in the mixing box 2 can be stirred from different directions and positions, so that the powder forms a complex and orderly flow state in the box, which fully breaks the agglomeration and stratification of the powder, and achieves more uniform mixing.

[0024] In an optional embodiment: a mounting bracket 65 is fixedly installed on the box cover 3 above two sets of pulleys 62, and a drive motor 63 is fixedly installed on the top of the mounting bracket 65. The output shaft of the drive motor 63 passes through the mounting bracket 65 and is fixedly installed on the top of one set of rotating rods 61.

[0025] It should be noted that the mounting frame 65 adopts a shock-absorbing structure design with internal rubber shock-absorbing pads, which can reduce the vibration transmitted to the cover 3 during the operation of the drive motor 63; the drive motor 63 is a variable frequency speed control motor, which can adjust the stirring speed according to the powder particle size. The shock-absorbing design reduces the overall vibration noise of the equipment and avoids secondary agglomeration of powder caused by vibration; the variable frequency speed control function is adapted to the mixing needs of polyimide powders of different particle sizes, improving the versatility of the equipment.

[0026] In an optional embodiment: the auxiliary scraping mechanism 7 includes two sets of cylinders 71, which are symmetrically fixedly installed on the top of the box cover 3. One end of the telescopic end of the two sets of cylinders 71 passes through the box cover 3 and is fixedly connected to a connecting block 72. The opposite sides of the two sets of connecting blocks 72 are jointly fixedly connected to an annular scraper 73, and the outer wall of the annular scraper 73 is in contact with the inner wall of the mixing box 2.

[0027] It should be noted that the annular scraper 73 is made of polyurethane (Shore hardness 60°), which ensures a tight fit with the box wall (gap ≤0.1mm) and avoids scratching the inner wall; the connecting block 72 is connected to the annular scraper 73 by detachable bolts, which facilitates replacement after the scraper wears out.

[0028] Two sets of cylinders 71 can simultaneously drive the annular scraper 73 to descend, so that when the polyimide powder is discharged after being mixed in the mixing box 2, the annular scraper can clean the powder adhering to the inner wall of the mixing box 2 in 360° without dead angles, reducing material waste; the polyurethane material has both elasticity and wear resistance.

[0029] It is worth noting that the two sets of cylinders 71 use the same air source for air supply. The flow is evenly distributed by installing a synchronization valve (such as a flow divider and combiner valve) to ensure that the amount of compressed air entering the two cylinders 71 is consistent, thereby achieving synchronization of extension and retraction speed and stroke. The accuracy class of the synchronization valve is selected as ±2% to meet the synchronization requirements of the scraper mechanism 7.

[0030] In an optional embodiment: the bottom of the mixing box 2 is fixedly connected to a discharge pipe 8, and a solenoid valve 9 is provided on the outer wall of the discharge pipe 8.

[0031] It should be noted that the inner wall of the discharge pipe 8 is smooth and without dead corners to avoid powder residue; the solenoid valve 9 is an explosion-proof two-position two-way valve, which can be linked with the mixing mechanism 6 through the control system to achieve automatic discharge after mixing.

[0032] Working principle: When this utility model is in use, the lifting mechanism 4 drives the box cover 3 to descend and cover the top of the mixing box 2, and the polyimide powder and additives are added into the mixing box 2 through the feeding hopper 5. In the mixing mechanism 6, the drive motor 63 drives the connected rotating rod 61 to rotate. The top pulley 62 of the rotating rod 61 drives another set of pulleys 62 and the rotating rod 61 to rotate synchronously through belt transmission. The stirring rod 64 rotates with the rotating rod 61. The reverse tilting design forms upper and lower convection to achieve uniform mixing of powder. After mixing is complete, the solenoid valve 9 is opened, and the mixed powder is automatically discharged through the discharge pipe 8, completing the entire mixing process. At the same time, the two sets of cylinders 71 in the auxiliary scraping mechanism 7 drive the annular scraper 73 to move up and down along the inner wall of the mixing box 2 through synchronous control, cleaning the adhering powder in real time and avoiding residue accumulation.

[0033] The control method in this application is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art and is common knowledge in the field. Furthermore, this application is mainly used to protect the structure and shape and their combination, so the control method and circuit connection will not be explained in detail in this application.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mixing device for producing polyimide powder, characterized in that, Including support base (1); The mixing box (2) is fixedly installed on the support base (1); The box cover (3) is sealed to the top of the mixing box (2) by a sealing gasket, and the feeding hopper (5) is installed through the box cover (3). The lifting mechanism (4) is installed on the top of the support base (1) and is used to lift the box cover (3); The mixing mechanism (6) is installed on the box cover (3) and is used to mix and stir the polyimide powder inside the mixing box (2); An auxiliary scraping mechanism (7) is installed on the box cover (3) to assist in scraping the inner wall of the mixing box (2).

2. The mixing device for producing polyimide powder according to claim 1, characterized in that: The lifting mechanism (4) includes a fixed frame (41), which is fixedly installed on the top of the support base (1). An electric hydraulic rod (42) is fixedly installed on the inner top of the fixed frame (41). The top of the telescopic end of the electric hydraulic rod (42) passes through the top wall of the fixed frame (41) and is fixedly connected to a connecting plate (43). A connecting frame (44) is fixedly installed on the top of the connecting plate (43). One end of the connecting frame (44) is fixedly installed on the top of the box cover (3).

3. The mixing device for producing polyimide powder according to claim 2, characterized in that: The fixing frame (41) is slidably connected to guide rods (45) on both sides of the electric hydraulic rod (42), and the top of the two sets of guide rods (45) are fixedly connected to the bottom of the connecting plate (43).

4. The mixing device for producing polyimide powder according to claim 1, characterized in that: The mixing mechanism (6) includes two sets of rotating rods (61). Both sets of rotating rods (61) are symmetrically mounted on the box cover (3) via bearings. The top of each set of rotating rods (61) is fixedly fitted with a pulley (62). The two sets of pulleys (62) are connected by belt drive. The top of one set of rotating rods (61) is connected to a drive motor (63). Several sets of stirring rods (64) are fixedly installed on the outer walls of both sets of rotating rods (61).

5. The mixing device for producing polyimide powder according to claim 4, characterized in that: The cover (3) is fixedly mounted on a mounting bracket (65) above two sets of pulleys (62). The drive motor (63) is fixedly mounted on the top of the mounting bracket (65). The output shaft of the drive motor (63) passes through the mounting bracket (65) and is fixedly mounted on the top of one of the rotating rods (61).

6. The mixing device for producing polyimide powder according to claim 1, characterized in that: The auxiliary scraping mechanism (7) includes two sets of cylinders (71). The two sets of cylinders (71) are symmetrically fixedly installed on the top of the box cover (3). One end of the telescopic end of the two sets of cylinders (71) passes through the box cover (3) and is fixedly connected to a connecting block (72). The opposite sides of the two sets of connecting blocks (72) are jointly fixedly connected to an annular scraper (73). The outer wall of the annular scraper (73) is in contact with the inner wall of the mixing box (2).

7. The mixing apparatus for producing polyimide powder according to claim 1, characterized in that: The bottom of the mixing box (2) is fixedly connected to the discharge pipe (8), and the outer wall of the discharge pipe (8) is provided with a solenoid valve (9).

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