A fluid bed granulator with uniform granulation

Abstract

This invention discloses a fluidized bed granulator for uniform granulation, relating to the field of granulator technology. It includes an inner screen with flow holes at its bottom. A centrifugal screen, rotatably connected to the inner screen, is located on one side of the flow holes. An annular guide plate is arranged around the circumference of the centrifugal screen to guide the granulation process. The advantages of this invention are: a double-screen structure of a fixed inner screen and a movable centrifugal screen is set inside the fluidized bed granulation chamber. The fixed inner screen first centrifuges and separates the granules from the material, allowing the separated granules to fall into the centrifugal screen. The centrifugal screen is controlled to separate and discharge the granulated particles. Simultaneously, the material separated from the inner screen is guided back through the flow holes. This effectively separates and discharges the granules from the material, reduces the mixing of granules and material, avoids accumulation affecting subsequent raw material granulation, and improves granulation separation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of granulator technology, and in particular to a fluidized bed granulator that produces uniform granules. Background Technology

[0002] As an important piece of equipment in the pharmaceutical and chemical industry, fluidized bed granulators play a key role in the field of granulation. Their core technology lies in using high-speed hot airflow to create a boiling state in the material, while simultaneously combining it with a granulation device to achieve uniform granulation. This equipment can efficiently convert raw materials into the desired granular products and is widely used in various industries such as pharmaceuticals, food, and chemicals.

[0003] Existing fluidized bed granulators are not convenient for timely discharge of granules after granulation, which leads to granule accumulation and affects the granulation process of subsequent raw materials. Utility Model Content

[0004] Therefore, the purpose of this utility model is to propose a fluidized bed granulator that produces uniform granulation, in order to solve the problems mentioned in the background art and overcome the shortcomings of the existing technology.

[0005] To achieve the above objectives, one embodiment of this utility model provides a fluidized bed granulator for uniform granulation, comprising a fluidized bed granulation chamber for granulating fluidized materials. The inner wall of the fluidized bed granulation chamber is polished to prevent material adhesion. A gas distribution plate (perforated plate) is provided at the bottom to evenly distribute airflow, and a bottom spray nozzle is provided inside the gas distribution plate to atomize and adhere the adhesive to the material using compressed air or pump pressure. A fluidized bed turntable is provided at the bottom of the fluidized bed granulation chamber to stir the fluidized materials and granulation. An inner layer screen for sorting the granules is provided around the circumference of the fluidized bed turntable. A flow hole is provided at the bottom of the inner layer screen to allow the fluidized material to flow back. A centrifugal screen is provided on one side of the flow hole and is rotatably connected to the inner layer screen. An annular guide plate is provided around the circumference of the centrifugal screen to guide the granulation. A negative pressure suction box for discharging the granules is provided on one side of the annular guide plate. Several cleaning scrapers are provided around the bottom circumference of the inner layer screen and are attached to the inner wall of the centrifugal screen.

[0006] The above technical solution is adopted: the various structures of the fluidized bed granulator are automatically controlled by a PLC control system, and filter bags and an exhaust system are installed at the top of the fluidized bed granulation chamber to filter and discharge the gas.

[0007] Preferably, the bottom of the fluidized bed granulation chamber is provided with a fixed support for support, one end of the bottom of the fluidized bed granulation chamber is provided with a discharge hole for discharging the granules, and the circumference of the fluidized bed turntable is provided with a scraper that fits against the inner wall of the inner screen.

[0008] The above technical solution is adopted: the bottom fixed support of the fluidized bed granulation chamber serves as the load-bearing structure of the device, the bottom discharge hole is connected to the negative pressure suction box, the circumferential scraper of the fluidized bed disc is attached to the inner wall of the inner screen to prevent adhesion when the material is stirred in a fluidized state. During operation, the hot air flows through the bottom gas distribution plate to make the material boil, the disc stirs synchronously, and the granulation is completed with the help of atomized binder. After granulation, the particles are pushed to the screen for separation by the scraper.

[0009] Preferably, in any of the above embodiments, the inner screen includes a screening frame for sieving granulation and a hopper for guiding materials. The screening frame is fixedly installed inside the fluidized bed granulation chamber, the top of the screening frame is fixedly connected to the hopper, and the flow holes are opened at the bottom of the screening frame.

[0010] The above technical solution is adopted: the screening frame of the inner screen is fixed in the bin, and the top hopper guides the material to gather towards the screen. During the granulation process, the particles that meet the particle size requirements fall into the centrifugal screen through the screen, and the materials that do not meet the standards are returned to the boiling zone through the bottom flow holes for regranulation, thereby improving screening efficiency and reducing particle mixing.

[0011] Preferably, as described in any of the above embodiments, the centrifugal screen includes a centrifugal motor for driving, a pulley assembly for transmitting power, and a centrifugal screen for screening granules. The centrifugal motor is fixedly installed on the top of a fixed support. The output end of the centrifugal motor is fixedly installed with a pulley assembly located inside the fixed support. One end of the pulley assembly is fixedly installed with a centrifugal screen that rotates inside the fluidized bed granulation chamber and the fixed support. A screening chamber for sorting granules and materials is provided between the centrifugal screen and the screening frame.

[0012] Using the above technical solution: the centrifugal motor drives the centrifugal screen to rotate through the pulley set. The centrifugal screen (with the same aperture as the screening frame) and the screening frame form a sieve cavity. Under the action of centrifugal force, the particles stick to the centrifugal screen, further separating impurities. The pure particles are thrown to the edge and enter the annular guide plate area.

[0013] Preferably, in any of the above embodiments, the inner diameter of the annular guide plate is the same as the outer diameter of the centrifugal mesh, the annular guide plate is fixedly installed at the bottom of the fluidized bed granulation chamber, the top of the annular guide plate is set as a sloping structure, and the lowest point of the annular guide plate is close to the negative pressure suction box.

[0014] The above technical solution is adopted: the inner diameter of the annular guide plate matches the outer diameter of the centrifugal mesh, and the top inclined surface uses gravity to guide the particles to the lowest point (close to the negative pressure suction box). The inclined surface is smoothly set to reduce particle retention, increase the guiding speed, and ensure that the particles quickly enter the negative pressure suction range.

[0015] Preferably, in any of the above embodiments, the negative pressure suction box includes a negative pressure material box that provides negative pressure force and a guide pipe that guides the granulation process. The guide pipe is fixedly installed at one end of the bottom of the fluidized bed granulation chamber, and the negative pressure material box is fixedly installed at one end of the guide pipe. The negative pressure material box is located on one side of the fluidized bed granulation chamber.

[0016] The above technical solution is adopted: the negative pressure material box generates suction through the guide pipe to suck in the particles gathered by the annular guide plate. The inlet of the guide pipe is aligned with the lowest point of the slope. The suction volume can be adjusted by the negative pressure to avoid particle accumulation and achieve continuous discharge.

[0017] Preferably, as described in any of the above embodiments, the cleaning scraper includes a cleaning blade located at the bottom of the centrifuge screen, a clamping spring for support, and a fastening block for engaging the cleaning blade. The cleaning blade is inserted into the bottom of the screening screen frame, and clamping springs are fixedly installed at both ends of the cleaning blade. A fastening block that moves inside the cleaning blade is fixedly installed at one end of the clamping spring. The cleaning blade is in contact with the bottom surface of the centrifuge screen.

[0018] The above technical solution is adopted: the cleaning blade is attached to the bottom surface of the centrifugal screen by the clamping spring, and the fastening block is embedded in the slot of the screening screen frame for fixation. When the centrifugal screen rotates, the cleaning blade scrapes off the attached particles, prevents the screen holes from being blocked, improves the cleaning efficiency, and the clamping spring compensates for the wear.

[0019] The material is fluidized by hot air in the fluidized bed granulation chamber. The fluidized bed rotating disc agitates and granulates the material with the help of a binder. The granules are initially screened by the inner screen. Qualified granules fall into the centrifugal screen, while impurities are returned through the flow holes. The centrifugal screen rotates to achieve secondary sorting. Pure granules are thrown onto the annular guide plate and slide along the inclined plane to the negative pressure suction box, where they are sucked in and discharged. The cleaning scraper cleans the centrifugal screen simultaneously to prevent clogging.

[0020] Compared with the prior art, the advantages and beneficial effects of this utility model are as follows: 1. The fluidized bed granulation chamber is equipped with a double screen structure consisting of a fixed inner screen and a movable centrifugal screen. The fixed inner screen first separates the granules from the material by centrifugation, allowing the separated granules to fall into the centrifugal screen. The centrifugal screen is controlled to separate and discharge the granulated particles. At the same time, the material separated from the inner screen is guided back through the flow holes. This effectively separates the granules from the material, reduces the mixing of granules and materials, avoids accumulation that may affect the granulation of subsequent raw materials, and improves the efficiency of granulation separation.

[0021] 2. An annular guide plate with a sloping structure is set around the circumference of the centrifugal screen. The structural features of the annular guide plate guide the centrifuged granules to the suction port of the negative pressure suction box, which facilitates the guidance of the granules, promotes rapid separation and discharge of the granules, and improves the working efficiency of the fluidized bed granulator.

[0022] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure according to an embodiment of the present utility model; Figure 2 This is a partial structural schematic diagram according to an embodiment of the present utility model; Figure 3 This is a side sectional view of the fluidized bed granulation chamber according to an embodiment of the present invention. Figure 4 This is a cross-sectional structural diagram of the inner screen according to an embodiment of the present invention; Figure 5 According to the embodiments of this utility model Figure 4 Enlarged structural diagram at point A; Figure 6 According to the embodiments of this utility model Figure 4 Enlarged structural diagram at point B; Among them: 1-boiling granulation bin, 2-boiling turntable, 3-inner layer screen, 31-screening frame, 32-hopper, 4-flow hole, 5-centrifugal screen, 51-centrifugal motor, 52-pulley assembly, 53-centrifugal screen, 6-ring guide plate, 7-negative pressure suction box, 71-negative pressure material box, 72-guide pipe, 8-cleaning scraper, 81-cleaning knife, 82-clamping spring, 83-fastening block. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0025] like Figure 1-6As shown in the figure, a fluidized bed granulator for uniform granulation according to an embodiment of the present invention includes a fluidized bed granulation chamber 1 for granulating fluidized materials. The inner wall of the fluidized bed granulation chamber 1 is polished to prevent material adhesion. A gas distribution plate (perforated plate) is provided at the bottom to evenly distribute the airflow. Bottom spray nozzles are provided inside the chamber to atomize the binder and adhere it to the material using compressed air or pump pressure. A fluidized bed rotating disc 2 is provided at the bottom of the fluidized bed granulation chamber 1 to stir the fluidized materials and granulation process. The inner screen 3 is arranged around the circumference to sort the granules. The bottom of the inner screen 3 is provided with a flow hole 4 for the return of the fluidized material. A centrifugal screen 5 is provided on one side of the flow hole 4 and is rotatably connected to the inner screen 3. An annular guide plate 6 is arranged around the circumference of the centrifugal screen 5 to guide the granules. A negative pressure suction box 7 is provided on one side of the annular guide plate 6 to discharge the granules. Several cleaning scrapers 8 are arranged around the bottom circumference of the inner screen 3 and are attached to the inner wall of the centrifugal screen 5.

[0026] The above technical solution is adopted: the various structures of the fluidized bed granulator are automatically controlled by the PLC control system, and filter bags and exhaust systems are installed at the top of the fluidized bed granulation chamber 1 to filter and discharge the gas.

[0027] Preferably, the bottom of the fluidized bed granulation chamber 1 is provided with a fixed support for support, one end of the bottom of the fluidized bed granulation chamber 1 is provided with a discharge hole for discharging the granules, and the circumference of the fluidized bed turntable 2 is provided with a scraper that fits against the inner wall of the inner screen 3.

[0028] The above technical solution is adopted: the bottom fixed support of the fluidized granulation chamber 1 serves as the load-bearing structure of the device, the bottom discharge hole is connected to the negative pressure suction box 7, the circumferential scraper of the fluidized turntable 2 is attached to the inner wall of the inner screen 3 to avoid adhesion when stirring the fluidized material. During operation, the hot air flows through the bottom gas distribution plate to make the material boil, the turntable stirs synchronously, and the granulation is completed with the help of atomized binder. After granulation, the particles are pushed to the screen for separation by the scraper.

[0029] Preferably, the inner screen 3 includes a screening frame 31 for screening granulation and a hopper 32 for guiding materials. The screening frame 31 is fixedly installed inside the fluidized bed granulation chamber 1. The hopper 32 is fixedly connected to the top of the screening frame 31, and the flow hole 4 is opened at the bottom of the screening frame 31.

[0030] The above technical solution is adopted: the screening frame 31 of the inner screen 3 is fixed in the bin, and the top hopper 32 guides the material to gather towards the screen. During the granulation process, the particles that meet the particle size requirements fall into the centrifugal screen 5 through the screen, and the materials that do not meet the standards are returned to the boiling zone for regranulation through the bottom flow hole 4, thereby improving the screening efficiency and reducing particle mixing.

[0031] Preferably, in any of the above embodiments, the centrifugal screen 5 includes a centrifugal motor 51 for driving, a pulley assembly 52 for transmitting power, and a centrifugal screen 53 for screening granules. The centrifugal motor 51 is fixedly installed on the top of the fixed support. The output end of the centrifugal motor 51 is fixedly installed with the pulley assembly 52 located inside the fixed support. One end of the pulley assembly 52 is fixedly installed with the centrifugal screen 53, which rotates inside the fluidized bed granulation chamber 1 and the fixed support. A screening chamber for sorting granules and materials is provided between the centrifugal screen 53 and the screening frame 31.

[0032] Using the above technical solution: the centrifugal motor 51 drives the centrifugal mesh 53 to rotate through the pulley group 52. The centrifugal mesh 53 (with the same aperture as the screening frame 31) and the screening frame 31 form a sieve cavity. Under the action of centrifugal force, the particles stick to the centrifugal mesh 53, further separating impurities. The pure particles are thrown to the edge and enter the area of ​​the annular guide plate 6.

[0033] Preferably, in any of the above schemes, the inner diameter of the annular guide plate 6 is the same as the outer diameter of the centrifugal mesh 53, the annular guide plate 6 is fixedly installed at the bottom of the fluidized bed granulation chamber 1, the top of the annular guide plate 6 is set as a sloping structure, and the lowest point of the annular guide plate 6 is close to the negative pressure suction box 7.

[0034] The above technical solution is adopted: the inner diameter of the annular guide plate 6 matches the outer diameter of the centrifugal mesh 53, and the top inclined surface uses gravity to guide the particles to the lowest point (close to the negative pressure suction box 7). The inclined surface is smoothly set to reduce particle retention, increase the guiding speed, and ensure that the particles quickly enter the negative pressure suction range.

[0035] Preferably, the negative pressure suction box 7 includes a negative pressure material box 71 that provides negative pressure force and a guide pipe 72 that guides the granulation. The guide pipe 72 is fixedly installed at one end of the bottom of the fluidized bed granulation chamber 1, and the negative pressure material box 71 is fixedly installed at one end of the guide pipe 72. The negative pressure material box 71 is located on one side of the fluidized bed granulation chamber 1.

[0036] Using the above technical solution: the negative pressure material box 71 generates suction through the guide pipe 72 to suck in the particles gathered by the annular guide plate 6. The inlet of the guide pipe 72 is aligned with the lowest point of the inclined plane. The suction volume can be adjusted by the negative pressure to avoid particle accumulation and achieve continuous discharge.

[0037] Preferably, the cleaning scraper 8 includes a cleaning blade 81 located at the bottom of the centrifugal screen 53, a clamping spring 82 for support, and a fastening block 83 for engaging the cleaning blade 81. The cleaning blade 81 is inserted into the bottom of the screening frame 31. The clamping spring 82 is fixedly installed at both ends of the cleaning blade 81. The fastening block 83, which moves inside the cleaning blade 81, is fixedly installed at one end of the clamping spring 82. The cleaning blade 81 and the bottom surface of the centrifugal screen 53 are in contact.

[0038] The above technical solution is adopted: the cleaning blade 81 is attached to the bottom surface of the centrifugal screen 53 by the clamping spring 82, and the fastening block 83 is embedded in the slot of the screening frame 31 for fixation. When the centrifugal screen 53 rotates, the cleaning blade 81 scrapes off the attached particles, prevents the screen holes from being blocked, improves the cleaning efficiency, and the clamping spring compensates for the wear.

[0039] The working principle of this fluidized bed granulator with uniform granulation is as follows: Inside the fluidized bed granulation chamber 1, hot airflow causes the material to boil. The fluidized bed turntable 2 stirs the material and granulates it in conjunction with the atomized binder. The screening frame 31 of the inner screen 3 performs primary screening of the particles. Qualified particles fall into the centrifugal screen 5, while substandard materials are returned through the bottom flow holes 4. The hopper 32 guides the material to gather. The centrifugal motor 51 of the centrifugal screen 5 drives the centrifugal screen 53 to rotate through the pulley group 52. Under the action of centrifugal force, the particles are sorted a second time. Pure particles are thrown to the annular guide plate 6. The inclined surface of the annular guide plate 6 guides the particles to the negative pressure suction box 7. The negative pressure box 71 sucks away the particles through the guide pipe 72. The cleaning scraper 8 at the bottom of the inner screen 3 adheres to the centrifugal screen 53 and cleans the attached particles as it rotates, ensuring uniform granulation and efficient discharge.

[0040] Compared with the prior art, the present invention has the following advantages: 1. The fluidized bed granulation chamber 1 is equipped with a double screen structure consisting of a fixed inner screen 3 and a movable centrifugal screen 5. The fixed inner screen 3 first separates the granules from the material by centrifugation, allowing the separated granules to fall into the centrifugal screen 5. The centrifugal screen 5 is controlled to separate and discharge the granulated particles. At the same time, the material separated from the inner screen 3 is guided back through the flow holes 4. This effectively separates and discharges the granules from the material, reduces the mixing degree between the granules and the material, avoids accumulation that affects the granulation of subsequent raw materials, and improves the efficiency of granulation separation.

[0041] 2. An annular guide plate 6 with a sloping structure is set around the circumference of the centrifugal screen 5. The structural features of the annular guide plate 6 are used to guide the centrifuged granules to the suction port of the negative pressure suction box 7, which facilitates the guidance of the granules, promotes the rapid separation and discharge of the granules, and improves the working efficiency of the fluidized bed granulator.

Claims

1. A fluidized bed granulator for uniform granulation, comprising a fluidized bed granulation chamber (1) for granulating fluidized materials, wherein a fluidized bed rotating disc (2) for stirring the fluidized materials and granulation is provided at the bottom of the fluidized bed granulation chamber (1), characterized in that: The circumference of the boiling turntable (2) is provided with an inner screen (3) for sorting the granules. The bottom of the inner screen (3) is provided with a flow hole (4) for reflux of the fluidized material. A centrifugal screen (5) is provided on one side of the flow hole (4) and is rotatably connected to the inner screen (3). The circumference of the centrifugal screen (5) is provided with an annular guide plate (6) for guiding the granules. A negative pressure suction box (7) for discharging the granules is provided on one side of the annular guide plate (6). The bottom circumference of the inner screen (3) is provided with several cleaning scrapers (8) that are attached to the inner wall of the centrifugal screen (5).

2. The fluidized bed granulator for uniform granulation as described in claim 1, characterized in that: The bottom of the boiling granulation chamber (1) is provided with a fixed support for support. One end of the bottom of the boiling granulation chamber (1) is provided with a discharge hole for discharging the granules. The circumference of the boiling turntable (2) is provided with a scraper that fits against the inner wall of the inner screen (3).

3. The fluidized bed granulator for uniform granulation as described in claim 2, characterized in that: The inner screen (3) includes a screening frame (31) for screening granulation and a hopper (32) for guiding materials. The screening frame (31) is fixedly installed inside the fluidized bed granulation chamber (1). The hopper (32) is fixedly connected to the top of the screening frame (31). The flow hole (4) is opened at the bottom of the screening frame (31).

4. The fluidized bed granulator for uniform granulation as described in claim 3, characterized in that: The centrifugal screen (5) includes a centrifugal motor (51) for driving, a pulley assembly (52) for transmitting power, and a centrifugal screen (53) for screening granules. The centrifugal motor (51) is fixedly installed on the top of a fixed support. The output end of the centrifugal motor (51) is fixedly installed with a pulley assembly (52) located inside the fixed support. One end of the pulley assembly (52) is fixedly installed with a centrifugal screen (53) that rotates inside the fluidized bed granulation chamber (1) and the fixed support. A screening chamber for sorting granules and materials is provided between the centrifugal screen (53) and the screening frame (31).

5. The fluidized bed granulator for uniform granulation as described in claim 4, characterized in that: The inner diameter of the annular guide plate (6) is the same as the outer diameter of the centrifugal mesh (53). The annular guide plate (6) is fixedly installed at the bottom of the boiling granulation chamber (1). The top of the annular guide plate (6) is set as a sloping structure. The lowest point of the annular guide plate (6) is close to the negative pressure suction box (7).

6. The fluidized bed granulator for uniform granulation as described in claim 5, characterized in that: The negative pressure suction box (7) includes a negative pressure material box (71) that provides negative pressure force and a guide pipe (72) that guides the granulation. The guide pipe (72) is fixedly installed at one end of the bottom of the fluidized bed granulation chamber (1). The negative pressure material box (71) is fixedly installed at one end of the guide pipe (72). The negative pressure material box (71) is located on one side of the fluidized bed granulation chamber (1).

7. The fluidized bed granulator for uniform granulation as described in claim 6, characterized in that: The cleaning scraper (8) includes a cleaning blade (81) located at the bottom of the centrifugal screen (53), a clamping spring (82) for support, and a fastening block (83) for engaging the cleaning blade (81). The cleaning blade (81) is inserted into the bottom of the screening frame (31). The two ends of the cleaning blade (81) are fixedly installed with clamping springs (82). One end of the clamping springs (82) is fixedly installed with a fastening block (83) that moves inside the cleaning blade (81). The cleaning blade (81) and the bottom surface of the centrifugal screen (53) are in contact.

Images