A sieving device for preparing BPDA catalyst support

Abstract

This utility model relates to the technical field of screening equipment, specifically to a screening device for preparing BPDA catalyst carriers. A feeding hopper is located at the top of the screening box, and a horizontally placed rotating drum is located below the feeding hopper inside the screening box. A magnetic material is installed inside the rotating drum to adsorb and remove ferromagnetic particles. A horizontally placed rotating roller is located below the first waste plate inside the screening box, and a screen plate is fixedly installed below the rotating roller. Material flowing down one side of the rotating drum falls onto the screen plate via a discharge plate for downward screening. The rotating roller drives a scraper to rotate, which scrapes the material sequentially along the screen plate and the abrasive plate. Part of the material scraped onto the abrasive plate is further crushed and ground by the scraper and abrasive particles before flowing down to the screen plate for screening. The remaining large particles are pushed by the scraper until they fall down along the second waste plate and are discharged, achieving a better screening effect.

Description

Technical Field

[0001] This utility model relates to the field of screening equipment technology, and in particular to a screening device for preparing BPDA catalyst support. Background Technology

[0002] 3,3',4,4'-biphenyltetracarboxylic acid dianhydride (BPDA), a polyimide monomer, is a white crystalline powder mainly used in the production of polyimides, which are among the best-performing organic polymer materials. The preparation of BPDA typically involves a condensation reaction of chlorophthalic anhydride, alkali, additives, and a catalyst. Currently, the catalyst is often a reusable metal-supported graphene. For reusable BPDA catalysts, the quality of the support material is crucial, and one of the key factors determining this quality is the catalyst support material, such as graphene. The preparation of graphene support materials generally involves oxidation, drying, calcination, and sieving. The purpose of sieving the catalyst support material is primarily to obtain the desired particle size, improve purity, and remove impurities. Existing technologies typically employ methods such as vibrating sieving. However, during sieving, issues such as material blockage and low sieving efficiency arise due to variations in feed density and untimely waste discharge. Furthermore, the sieving effect is insufficient for ferromagnetic particles and large, agglomerated particles, thus requiring further optimization. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a sieving device for preparing BPDA catalyst support, so as to solve one or more of the problems mentioned above.

[0004] To achieve the above objectives, this invention provides a sieving device for preparing BPDA catalyst supports, comprising a sieving box:

[0005] The top of the screening box is equipped with a feed hopper, and a horizontally placed rotating drum is located below the feed hopper inside the screening box. The rotating drum is rotatably connected to the screening box. The material in the feed hopper flows down along one side of the rotating drum. A magnetic body is installed inside the rotating drum and is fixedly connected to the inner wall of the screening box. The magnetic body is located inside the rotating drum on the side close to where the material flows down. A first waste plate is fixedly installed below the rotating drum inside the screening box.

[0006] A horizontally placed rotating roller is located below the first waste plate inside the screening box. The rotating roller is rotatably connected inside the screening box. A screen plate is fixedly installed below the rotating roller inside the screening box. The screen plate has multiple screen holes. A material discharge plate is fixedly connected to one side of the screen plate at an upward inclination. An abrasive plate and a second waste plate are fixedly connected to the other side in sequence. The screen plate and the abrasive plate are designed with an arc shape that matches the rotating roller. The first waste plate and the second waste plate are used to discharge waste material at an inclined downward.

[0007] Multiple scraper strips are spaced apart on the outer circumference of the rotating roller. The scraper strips are designed to be parallel to the axial direction of the rotating roller. Multiple abrasive grains are spaced apart on the grinding plate. The material flowing down one side of the rotating roller falls onto the screen plate through the material drop plate. The rotating roller rotates axially, which drives the scraper strips to rotate. The scraper strips are used to scrape the material along the screen plate and the grinding plate in sequence. The part of the material scraped onto the grinding plate is further crushed and ground by the scraper strips and abrasive grains.

[0008] Preferably, the bottom of the feed hopper is provided with an inwardly protruding baffle to prevent material from flowing down the other side of the rotating drum.

[0009] Preferably, a scraper is provided at the top of the screening box, with one end of the scraper abutting against the other side of the rotating drum.

[0010] Preferably, an arc-shaped cover plate is provided inside the screening box below the first waste plate. The arc-shaped cover plate is located immediately above and adjacent to the rotating roller. The waste discharged from the first waste plate at an angle falls onto the arc-shaped cover plate and is guided downward to the second waste plate through the arc-shaped cover plate.

[0011] Preferably, a fan is fixedly installed inside the screening box on one side of the top of the discharge plate, and the fan blows air towards the top of the arc-shaped cover plate, so that the blown-away impurities fall downward along the arc-shaped cover plate.

[0012] Preferably, a horizontally placed transmission belt is provided below the screen plate inside the screening box, and a collection box is connected to both the conveying end of the transmission belt and the discharge end of the second waste plate.

[0013] Preferably, the collection box is fixedly installed on the side wall of the screening box. The top of the collection box inside the screening box has a collection port, and the side of the collection box outside the screening box has an opening design. A drawer is inserted into the collection box along its opening. A sealing plate is elastically inserted into the side of the collection box inside the screening box. The drawer is inserted into the collection box. The sealing plate is pushed out through the side of the drawer. The drawer is connected to the collection port. During the process of pulling the drawer out, the sealing plate moves laterally toward the inside of the collection box and gradually closes the collection port.

[0014] The beneficial effects of this utility model are as follows: A feed hopper is located at the top of the screening box. A horizontally placed rotating drum is located below the feed hopper inside the screening box. A magnetic material is installed inside the rotating drum to adsorb and remove ferromagnetic particles. A horizontally placed rotating roller is located below the first waste plate inside the screening box. A screen plate is fixedly installed below the rotating roller inside the screening box. A discharge plate is fixedly connected to one side of the screen plate at an upward angle, and an abrasive plate and a second waste plate are sequentially fixed to the other side. Multiple scraping strips are spaced apart on the outer circumference of the rotating roller, and multiple abrasive grains are spaced apart on the abrasive plate. Thus, the material flowing down one side of the rotating drum is discharged through the discharge plate... The material plate falls onto the screen plate for downward screening. The rotating roller rotates clockwise, driving the scraper to rotate and scrape the material along the screen plate and the grinding plate in sequence. This facilitates the uniform dispersion and screening of the material. On the other hand, some of the material scraped onto the grinding plate is further crushed and ground by the scraper and abrasive particles. Subsequently, some large particles or lumps that were not screened are further crushed and ground before flowing down to the screen plate for screening. Large particles that cannot be crushed or ground are pushed by the scraper until they fall down along the second waste plate and are discharged, thus achieving a better screening effect. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of the screening box of this utility model;

[0017] Figure 2 For the present utility model Figure 1 Enlarged view of point A in the middle;

[0018] Figure 3 This is a schematic diagram of the structure of the rotating roller of this utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the drawer of this utility model when it is inserted into the collection box;

[0020] Figure 5 This is a schematic diagram of the drawer of this utility model when it is pulled outwards.

[0021] The diagram is marked as follows:

[0022] 1. Screening box; 2. Feed hopper; 21. Material blocking section; 3. Rotary drum; 4. Magnetic body; 5. First waste plate; 6. Rotary roller; 61. Scraper strip; 7. Screen plate; 8. Drop plate; 9. Abrasive plate; 91. Abrasive grain; 10. Second waste plate; 11. Scraper; 12. Arc-shaped cover plate; 13. Fan; 14. Transmission belt; 140. Guide plate; 15. Collection box; 16. Collection port; 17. Drawer; 18. Sealing plate. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0024] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] A sieving device for preparing a BPDA catalyst support includes a sieving box 1, a feed hopper 2 at the top of the sieving box 1, a horizontally positioned rotating drum 3 below the feed hopper 2 inside the sieving box 1, the rotating drum 3 being rotatably connected to the sieving box 1, the material in the feed hopper 2 flowing down one side of the rotating drum 3, a magnetic body 4 inside the rotating drum 3, fixedly connected to the inner wall of the sieving box 1, the magnetic body 4 being located on the side of the rotating drum 3 near the material flowing down, a first waste plate 5 fixedly positioned below the rotating drum 3 inside the sieving box 1, a horizontally positioned rotating roller 6 rotatably connected to the sieving box 1 below the first waste plate 5, and a sieve plate 7 fixedly positioned below the rotating roller 6 inside the sieving box 1, the sieve plate 7 having multiple sieve holes. A material discharge plate 8 is fixedly connected to one side at an upward angle, and an abrasive plate 9 and a second waste plate 10 are fixedly connected to the other side in sequence. The screen plate 7 and the abrasive plate 9 are designed with an arc shape that matches the rotating roller 6. The first waste plate 5 and the second waste plate 10 are used to discharge waste material at an angle downward. Multiple scraper strips 61 are arranged at intervals on the outer circumference of the rotating roller 6. The scraper strips 61 are designed to be parallel to the axial direction of the rotating roller 6. Multiple abrasive grains 91 are arranged at intervals on the abrasive plate 9. The material flowing down along one side of the rotating drum 3 falls onto the screen plate through the material discharge plate 8. The rotating roller 6 rotates axially, which drives the scraper strips 61 to rotate, and is used to scrape the material along the screen plate 7 and the abrasive plate 9 in sequence. Some of the material scraped onto the abrasive plate 9 is further crushed and ground by the scraper strips 61 and the abrasive grains 91.

[0026] like Figure 1 , Figure 2 , Figure 3 As shown, this utility model is based on a conventional BPDA catalyst carrier screening device, including a screening box 1. Specifically, a feed hopper 2 is provided at the top of the screening box 1. A horizontally placed rotating drum 3 is provided below the feed hopper 2 inside the screening box 1. The rotating drum 3 is rotatably connected inside the screening box 1. The material in the feed hopper 2 flows down along one side of the rotating drum 3. A magnetic body 4 is provided inside the rotating drum 3 and is fixedly connected to the inner wall of the screening box 1. The magnetic body 4 is located inside the rotating drum 3 on the side near the material flowing down. A first waste plate 5 is fixedly provided below the rotating drum 3 inside the screening box 1. Specifically, as shown... Figure 1 , Figure 2As shown, the feed hopper 2 is located at the top left of the screening box 1. The bottom of the feed hopper 2 is provided with an inwardly protruding baffle 21 to prevent material from flowing down the other side, i.e., the right side, of the rotating drum 3. The rotating drum 3 rotates counterclockwise, causing the material in the feed hopper 2 to flow down the left side of the rotating drum 3, which facilitates uniform flow distribution. The magnetic body 4 is designed as an arc segment close to the inner wall of the left side of the rotating drum 3. The magnetic body 4 can be a conventional component such as a permanent magnet or an electromagnet, used to adsorb ferromagnetic particles mixed in the material. When the ferromagnetic particles are rotated to the right side of the rotating drum 3, they lose the magnetic attraction of the magnetic body 4 and fall downwards onto the first waste plate 5 and are discharged in time. Optionally, a component such as an external gear ring can be connected to one end of the rotating drum 3. The outer ring of the external gear ring can be meshed with a component such as a gear. The gear shaft extends out of the screening box 1 and is driven by conventional drive components such as a geared motor, which in turn drives the rotating drum 3 to rotate axially. The magnetic body 4 inside the rotating drum 3 is fixed on the inner wall of the screening box 1.

[0027] Inside the screening box 1, below the first waste plate 5, is a horizontally positioned rotating roller 6. The rotating roller 6 is rotatably connected inside the screening box 1, and its shaft extends out of the screening box 1. It is driven by conventional drive components such as a geared motor, which in turn drives the rotating roller 6 to rotate axially. Inside the screening box 1, below the rotating roller 6, is a fixed screen plate 7 with multiple screen holes for screening materials of suitable particle size downwards. One side of the screen plate 7 is inclined upwards and fixedly connected to a discharge plate 8, while the other side is sequentially fixedly connected to an abrasive plate 9 and a second waste plate 10. The screen plate 7 and the abrasive plate 9 are designed with an arc shape that matches the rotating roller 6. The first waste plate 5 and the second waste plate 10 are used to discharge waste material downwards at an angle. Multiple scraper strips 61 are spaced apart on the outer circumference of the rotating roller 6, and multiple abrasive grains 91 are spaced apart on the abrasive plate 9. Specifically, the scraper strips 61 are parallel to the rotating roller. The axial design of roller 6 allows the scraper 61 to be designed as a triangular shape with its tip pointing outwards, and the abrasive grains 91 to be designed as a hemispherical shape with their arc end faces facing upwards. Thus, the material flowing down one side of the rotating drum 3 falls onto the screen plate 7 via the drop plate 8 for downward screening. The rotating roller 6 rotates clockwise, driving the scraper 61 to rotate, which in turn scrapes the material along the screen plate 7 and the abrasive plate 9. This facilitates the uniform dispersion and screening of the material. On the other hand, some of the material scraped onto the abrasive plate 9 is further crushed and ground by the scraper 61 and the abrasive grains 91. Subsequently, some large particles or agglomerated materials that are not screened are further crushed and ground before flowing down to the screen plate 7 for screening. Large particles that cannot be crushed or ground are pushed by the scraper 61 until they fall down and are discharged along the second waste plate 10, thereby achieving a better screening effect.

[0028] In the embodiments of this utility model, optionally, such as Figure 1 , Figure 2As shown, a scraper 11 is provided at the top of the screening box 1. One end of the scraper 11 abuts against the other side of the rotating drum 3, i.e., the upper right side. More preferably, the top end of the scraper 11 is rotatably connected to the screening box 1, and an elastic component such as a torsion spring is provided at the rotatable connection point to drive the bottom end of the scraper 11 to tightly abut against the upper right side of the rotating drum 3. The bottom end of the scraper 11 can also be provided with existing components such as rubber scrapers to facilitate the downward scraping of adsorbed ferromagnetic particles and impurity particles.

[0029] In the embodiments of this utility model, optionally, such as Figure 1 , Figure 2 , Figure 3 As shown, an arc-shaped cover plate 12 is provided in the screening box 1 below the first waste plate 5. The arc-shaped cover plate 12 is located immediately above and to the right of the rotating roller 6. The waste discharged from the first waste plate 5 at an angle falls onto the arc-shaped cover plate 12 and is guided downward through the arc-shaped cover plate 12 to the second waste plate 10, thereby collecting and discharging different types of waste in a unified manner.

[0030] In the embodiments of this utility model, optionally, such as Figure 1 , Figure 2 , Figure 3 As shown, a blower 13 is fixedly installed on one side of the top of the discharge plate 8 inside the screening box 1. The blower 13 blows air towards the top of the arc-shaped cover plate 12. Thus, if the material flowing down from the left side of the rotating drum 3 contains some light impurity particles, it will be blown away to the right by the blower 13. The blown-away impurities fall down along the arc-shaped cover plate 12 and are then discharged uniformly by the second waste plate 10. Normal material falls onto the discharge plate 8 and the screen plate 7 for normal screening.

[0031] In the embodiments of this utility model, optionally, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, a horizontally positioned transmission belt 14 is located below the screen plate 7 inside the screening box 1. The transmission belt 14 conveys the material screened by the screen plate 7 to the right. Both the conveying end of the transmission belt 14 and the discharge end of the second waste plate 10 are connected to a collection box 15. Figure 1 As shown, the upper collection box 15 is used to collect various types of waste materials in a unified manner, and the lower collection box 15 is used to collect the screened materials that are conveyed in a unified manner.

[0032] In the embodiments of this utility model, optionally, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5As shown, the collection box 15 is fixedly installed on the side wall of the screening box 1. The collection box 15 has a collection port 16 at the top of the screening box 1 for connecting the conveying end of the transmission belt 14 and the dropping end of the second waste plate 10. More preferably, a guide plate 140 can be provided between the conveying end of the transmission belt 14 and the top of the collection port 16 below. The guide plate 140 is fixed in the screening box 1 for guiding material into the collection port 16.

[0033] The material collection box 15 is designed with an opening on its right side, outside the screening box 1. A drawer 17 is horizontally inserted into the material collection box 15 along its opening. A sealing plate 18 is elastically inserted into the side of the material collection box 15 inside the screening box 1. The drawer 17 is inserted into the material collection box 15. When the sealing plate 18 is pushed outward through the side of the drawer 17, as... Figure 4 As shown, drawer 17 is connected to the material collection port 16 for normal material collection. After a period of use, when cleaning is required, the drawer 17 is pulled out as follows: Figure 5 As shown, the sealing plate 18 moves laterally toward the material collection box 15 and gradually closes the material collection port 16 until it is completely pulled out of the drawer 17. The sealing plate 18 also completely closes the material collection port 16, so that the drawer 17 can be pulled out for cleaning. During the short time of cleaning, the material falls onto the sealing plate 18 to prevent it from leaking into the material collection box 15. When the cleaned drawer 17 is reinserted into the material collection box 15, the material on the sealing plate 18 also falls into the drawer 17 for collection.

[0034] The drawer 17 and the collection box 15 can be fixed and limited by conventional fasteners such as buckles and pins. When the drawer 17 is inserted into the collection box 15, the drawer 17 is locked by the fasteners and pins. In addition, conventional elastic components such as springs can be connected between the outer end of the sealing plate 18 and the outer side of the collection box 15. The springs can be symmetrically arranged on both sides of the outer end of the sealing plate 18 to elastically pull the sealing plate 18 toward the inner side of the collection box 15.

[0035] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

Claims

1. A sieving device for preparing BPDA catalyst support, comprising a sieving box (1), characterized in that: The top of the screening box (1) is provided with a feeding hopper (2). A horizontally placed rotating drum (3) is provided in the screening box (1) below the feeding hopper (2). The rotating drum (3) is rotatably connected to the screening box (1). The material in the feeding hopper (2) flows down along one side of the rotating drum (3). A magnetic body (4) is provided in the rotating drum (3). The magnetic body (4) is fixedly connected to the inner wall of the screening box (1). The magnetic body (4) is located in the rotating drum (3) on the side close to the material flowing down. A first waste plate (5) is fixedly provided in the screening box (1) below the rotating drum (3). The screening box (1) is provided with a horizontally placed rotating roller (6) below the first waste plate (5). The rotating roller (6) is rotatably connected to the screening box (1). The screening box (1) is provided with a screen plate (7) below the rotating roller (6). The screen plate (7) is provided with multiple screen holes. One side of the screen plate (7) is inclined upward and fixedly connected to a discharge plate (8). The other side is sequentially fixedly connected to an abrasive plate (9) and a second waste plate (10). The screen plate (7) and the abrasive plate (9) are designed to be arc-shaped to match the rotating roller (6). The first waste plate (5) and the second waste plate (10) are used to discharge waste material at an inclined downward. Multiple scraper strips (61) are spaced apart on the outer periphery of the rotating roller (6). The scraper strips (61) are designed parallel to the axial direction of the rotating roller (6). Multiple abrasive grains (91) are spaced apart on the abrasive plate (9). The material flowing down along one side of the rotating drum (3) falls onto the screen plate (7) via the drop plate (8). The rotating roller (6) rotates axially, driving the scraper strips (61) to rotate, which are used to scrape the material along the screen plate (7) and the abrasive plate (9) in sequence. Some of the material scraped onto the abrasive plate (9) is further crushed and ground by the scraper strips (61) and the abrasive grains (91).

2. The sieving device for preparing BPDA catalyst support according to claim 1, characterized in that, The bottom end of the feed hopper (2) is provided with an inwardly protruding baffle (21) to prevent material from flowing down the other side of the rotating drum (3).

3. The sieving device for preparing BPDA catalyst support according to claim 1, characterized in that, The screening box (1) is equipped with a scraper (11) at the top, and one end of the scraper (11) abuts against the other side of the rotating drum (3).

4. The sieving device for preparing BPDA catalyst support according to claim 1, characterized in that, The screening box (1) is provided with an arc-shaped cover plate (12) located below the first waste plate (5). The arc-shaped cover plate (12) is located immediately above the rotating roller (6). The waste discharged from the first waste plate (5) falls onto the arc-shaped cover plate (12) and is guided downward through the arc-shaped cover plate (12) to the second waste plate (10).

5. The sieving device for preparing BPDA catalyst support according to claim 4, characterized in that, A fan (13) is fixedly installed inside the screening box (1) on one side of the top of the discharge plate (8). The fan (13) blows air towards the top of the arc-shaped cover plate (12), and the blown-away impurities fall down along the arc-shaped cover plate (12).

6. The sieving device for preparing BPDA catalyst support according to claim 1, characterized in that, The screening box (1) is provided with a horizontally placed transmission belt (14) located below the screen plate (7). The transmission end of the transmission belt (14) and the discharge end of the second waste plate (10) are both connected to a collection box (15).

7. The sieving device for preparing BPDA catalyst support according to claim 6, characterized in that, The collection box (15) is fixedly installed on the side wall of the screening box (1). The collection box (15) has a collection port (16) at the top of the screening box (1). The collection box (15) is designed to be open at the side end outside the screening box (1). A drawer (17) is inserted into the collection box (15) along its opening. A sealing plate (18) is elastically inserted into the side end of the collection box (15) inside the screening box (1). The drawer (17) is inserted into the collection box (15). The sealing plate (18) is pushed out through the side end of the drawer (17). The drawer (17) is connected to the collection port (16). During the process of pulling out the drawer (17), the sealing plate (18) moves laterally toward the collection box (15) and gradually closes the collection port (16).

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