A continuous granulation device and a granulation method using the same.

Abstract

This invention relates to the field of ceramic preparation technology, specifically a continuous granulation equipment and a granulation method using the same, comprising a spray tower, a heat source device, and a recovery device. The spray tower has a spraying mechanism and a discharge port at its top and bottom, respectively, with the input end of the spraying mechanism connected to the slurry. The heat source device acts on the top of the spray tower and supplies heat into it. The inlet and outlet of the recovery device are connected to the spray tower, with the outlet located beside the spraying mechanism. The inlet of the recovery device is located below the discharge port. The outlet of the recovery device can be positioned between the heat source device and the spraying mechanism. Under the action of wind, the powder moves towards the slurry droplets, using greater kinetic energy to propel it towards the droplets, allowing for better mixing of the powder and slurry. This eliminates the need for re-slurrying and water addition, and also eliminates the need for additional fuel, thus reducing fuel costs associated with continuous operation.

Description

Technical Field

[0001] This invention relates to the field of ceramic preparation technology, and in particular to a continuous granulation device and a granulation method using the same. Background Technology

[0002] Wet ceramic powdering is a key process widely used in the production of building ceramics, daily-use ceramics and special ceramics. It transforms fine ceramic raw material powder into coarse powder with a certain volume that meets molding requirements through steps such as liquid phase mixing, grinding and spray drying.

[0003] Ceramic wet powder production typically utilizes a drying spray tower. First, the powder is made into a slurry, which is then pumped to the drying spray tower via a high-pressure pump. There, it is atomized into micron-sized droplets (approximately 50-200 μm in diameter) and rapidly heat-exchanged with hot air (450-600℃), causing the moisture in the slurry to evaporate and forming larger, coarse powder particles. However, during the drying spray tower process, some slurry fails to form sufficiently large powder particles during drying. Current technology requires sorting and screening the dried powder after spraying, re-slurrying the non-compliant particles, and then repeating the drying spraying cycle. This re-slurrying process is complex, and waiting for the slurry to stabilize takes time. Furthermore, maintaining the drying spray system while waiting for the slurry to stabilize results in significant fuel and energy waste. Summary of the Invention

[0004] To address the aforementioned shortcomings, the present invention aims to provide a continuous granulation device and a granulation method thereof, thereby solving the problem of wasting time in existing wet ceramic powder production processes, which require re-slurrying of the powder.

[0005] To achieve this objective, the present invention adopts the following technical solution: a continuous granulation device, comprising a spray tower, a heat source device, and a recovery device; The top and bottom of the spray tower are respectively equipped with a spraying mechanism and a discharge port, and the input end of the spraying mechanism is connected to the slurry. The heat source device acts on the top of the spray tower and supplies heat into the spray tower; The inlet and outlet of the recycling device are respectively connected to the spray tower, and the outlet of the recycling device is located beside the spraying mechanism; the inlet of the recycling device is located below the discharge port. The recovery device is equipped with an adsorption mechanism, which is used to draw the powder in the spray tower into the recovery device using negative pressure. The adsorption mechanism includes a negative pressure component and a blowing component. The negative pressure component is connected to the inlet of the recovery device. The negative pressure component is used to generate negative pressure to adsorb the powder in the spray tower and transport it to the blowing component. The blowing component is connected to the negative pressure component, and the blowing component is used to provide airflow to send the powder into the outlet of the recycling device.

[0006] Preferably, the heat source device includes a hot air furnace, air ducts, and a fan; The top of the hot blast stove is connected to an air duct, the other end of which is connected to the top of the spray tower. The bottom of the hot blast stove is connected to a fan, which is used to supply air to the hot blast stove.

[0007] Preferably, the recycling device includes an integration chamber, multiple connectors, and an integration pipe; The inlet of the integrated chamber is connected to the spray tower through a first pipe. A connector is provided at the bottom of the integrated chamber. The connector is connected to the input end of the negative pressure component. The output end of the negative pressure component is connected to the integrated pipe. The input end of the integrated pipe is connected to the blowing component. The outlet of the integrated pipe is connected to the spray tower.

[0008] Preferably, the connecting components include a flap valve, a three-way pipe, a third connecting pipe, a first connecting pipe, a second connecting pipe, and a slurry tank; The bottom of the integrated chamber is connected to the input end of the flap valve, the output end of the flap valve is connected to the input end of the three-way pipe, one output end of the three-way pipe is connected to the input end of the first connecting pipe, the other output end of the three-way pipe is connected to the input end of the third connecting pipe, the output end of the third connecting pipe is connected to the slurry tank, and the output end of the first connecting pipe is connected to the input end of the negative pressure component. The third connecting pipe and the first connecting pipe are respectively equipped with a first solenoid valve and a second solenoid valve. The flap valve is equipped with a gravity sensor, and the gravity sensor is electrically connected to the first solenoid valve and the second solenoid valve respectively. The output end of the negative pressure component is connected to the input end of the second connecting pipe, and the output end of the second connecting pipe is connected to the integrated pipe.

[0009] Preferably, the connector further includes a funnel, and a funnel is provided at the bottom of the integration chamber. Multiple funnels are arranged in sequence, and the funnels are connected to the input end of the flap valve.

[0010] Preferably, a pressure sensor is installed inside the integrated tube, and the pressure sensor is located on the side near the blowing element to detect the pressure inside the integrated tube.

[0011] Preferably, it also includes a separator, which is disposed in the first pipeline. The separator has a first outlet and a second outlet, the first outlet being connected to the recovery device and the second outlet being connected to the discharge port. The separator is used to screen powders of different sizes. Larger powders are output from the second outlet, and smaller powders are output from the first outlet.

[0012] Preferably, the separator includes a separation chamber, a fixed component, and blades; The separation chamber includes an air inlet, a first outlet, and a second outlet; The air inlet and the first outlet are arranged facing each other on the front and rear sides of the separation chamber. The separation chamber has an annular chamber on the side near the first outlet. The diameter of the annular chamber is larger than the diameter of the first outlet. The second outlet is located at the bottom of the annular chamber. The fixing component is coaxially arranged with the separation chamber, and the tail end of the fixing component is flush with the front edge of the annular chamber. The outer shell of the fixing component is provided with inclined blades evenly distributed along its circumferential direction, and the tail end of the blades is flush with the tail end of the fixing component. There is a gap between the upper edge of the blade 63 and the inner wall of the separation chamber 61.

[0013] A granulation method, applied to the aforementioned continuous granulation equipment, is characterized by comprising the following steps: Step S1: Start the spraying mechanism, recovery device, and heat source device; Step S2: The granulation material is prepared into a slurry; the slurry is transported to the spraying mechanism by a pump; Step S3: The slurry is sprayed into the spray tower in the form of droplets under the action of the spraying mechanism; Step S4: The slurry droplets are dried by hot air to form particles. When the particles that meet the size specifications pass through the inlet of the recycling device, they overcome the negative pressure and fall from the outlet of the spray tower under the action of gravity. Powder smaller than the specified size is sucked into the recovery device under negative pressure, and the recovery device transports the powder back into the spray tower to recombine with the slurry droplets. Step S5: Repeat steps S2 to S4 until the granulation material is used up, then turn off the spraying mechanism, the recovery device, and the heat source device.

[0014] One of the above technical solutions has the following advantages or beneficial effects: The invention includes a recovery device, the inlet of which is located at the bottom of the spray tower to collect powder that has not formed large particles. The outlet of the recovery device can be located between the heat source device and the spraying mechanism. Under the action of wind, the powder moves towards the slurry droplets, impacting them with greater kinetic energy, thus allowing for better mixing of the powder and slurry droplets. This eliminates the need for re-slurrying and water addition, and also eliminates the need for additional fuel, reducing fuel costs associated with continuous operation. Attached Figure Description

[0015] Figure 1This is a structural schematic diagram of an embodiment of the present invention.

[0016] Figure 2 This is a schematic diagram of the structure of a recycling device in one embodiment of the present invention.

[0017] Figure 3 This is a schematic diagram of the separator in one embodiment of the present invention.

[0018] Figure 4 This is a cross-sectional view of the separator in one embodiment of the present invention.

[0019] The components include: spray tower 1, recovery device 2, and integration chamber 21. Connector 22, flap valve 221, tee pipe 222, third connecting pipe 223, first connecting pipe 224, second connecting pipe 225, slurry tank 226, funnel 227 Integrated tube 23, 3. Negative pressure component, 4. Blowing component, 5. First pipeline, 6. Separator, 61. Separation chamber, 611. Air inlet, 612. First outlet, 613. Second outlet, 614. Annular chamber, 62. Fixed component, 63. Blade, 7. Heat source device, 71. Hot air furnace, 72. Air duct, 73. Fan. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] like Figures 1-4 As shown, a continuous granulation device includes a spray tower 1, a heat source device 7, and a recovery device 2. The top and bottom of the spray tower 1 are respectively equipped with a spraying mechanism and a discharge port, and the input end of the spraying mechanism is connected to the slurry. The heat source device 7 acts on the top of the spray tower 1 and supplies heat to the spray tower 1; The inlet and outlet of the recycling device 2 are respectively connected to the spray tower 1, and the outlet of the recycling device 2 is located beside the spray mechanism; the inlet of the recycling device 2 is located below the discharge port. The recovery device 2 is equipped with an adsorption mechanism, which is used to draw the powder in the spray tower 1 into the recovery device 2 using negative pressure; the adsorption mechanism includes a negative pressure component 3 and a blowing component 4, the negative pressure component 3 is connected to the inlet of the recovery device 2, and the negative pressure component 3 is used to generate negative pressure to adsorb the powder in the spray tower 1 and transport it to the blowing component 4. The blowing component 4 is connected to the negative pressure component 3. The blowing component 4 is used to provide airflow to send the powder into the outlet of the recycling device 2.

[0025] The spraying mechanism is a spray head or nozzle. External power supplies transport the slurry to the spraying mechanism, which sprays the slurry into the spray tower 1. Under the action of the heat source device 7, the droplets of the adhesive are dried, forming particles. Only particles of a sufficiently large and regular size can be used in subsequent processes. Therefore, in existing technology, the product needs to be filtered to separate smaller powders from the sufficiently large particles. The separated powders need to be re-slurried and then transported back to the spraying mechanism. Because the re-slurrying process is complex and requires a certain amount of time to stabilize, and because the drying spraying system must be maintained while waiting for the slurry to slurry, a significant waste of fuel energy occurs.

[0026] However, data collection and research show that the un-caked powder contains 5% to 8% moisture, is relatively dry, and has a small volume. Small, dry powder can more easily combine with the slurry, utilizing the surface tension of the slurry droplets to adsorb the powder, causing the powder and slurry to recombine and increase particle size. This eliminates the need for re-slurrying and adding water, and also eliminates the need for additional fuel, thus reducing fuel costs associated with continuous operation of the spray tower 1.

[0027] Therefore, a recovery device 2 is provided in this invention. The inlet of the recovery device 2 is located beside the outlet. It uses negative pressure to adsorb and collect powder that has not formed large particles. The outlet of the recovery device 2 is located between the air outlet of the heat source device 7 and the spraying mechanism. Under the action of the wind, the powder moves towards the slurry droplets, rushing towards the slurry droplets with greater kinetic energy, so that the powder and slurry droplets can be better mixed. When the slurry droplets are sprayed out by the spraying mechanism, the slurry has a high humidity and the surface tension of the slurry droplets is also the greatest. At this time, the powder sprayed from the recovery device 2 can better combine with the slurry droplets, increasing the particle size of the slurry droplets. The recovery device 2 draws powder from the spray tower 1 through negative pressure. The weight of the powder drawn in is determined by adjusting the pressure intensity, so that large particles can fall to the outlet at the bottom of the spray tower, and the powder can be drawn into the recovery device 2. The powder can recombine with the newly added slurry droplets, increasing the particle size. In one embodiment, the negative pressure component 3 is a silo pump, and the blowing component 4 is a Roots blower. First, a certain negative pressure is generated at the inlet of the recovery device 2 by the negative pressure component 3. Under the influence of the adjusted negative pressure, large particles of finished product will fall directly into the finished product outlet at the bottom of the spray tower 1 due to gravity, while small particles of powder that do not meet the size requirements will be adsorbed by the negative pressure and enter the recovery device 2.

[0028] In order to deliver small powder particles more evenly, the present invention uses a blower 4 to re-input the collected powder into the spray tower 1. With the help of the air force of the blower 4, the powder will be dispersed and blown into the spray tower 1, avoiding the accumulation of powder entering the spray tower 1 and affecting the quality of the recombination of powder and slurry droplets.

[0029] It is worth mentioning that when the slurry stops being fed into the spray tower 1, since there is not enough slurry droplets to combine with the powder, the valve at the outlet of the recovery device 2 needs to be closed to prevent the powder from being discharged and affecting the quality of the finished product.

[0030] The outlet of the recovery device 2 is located above the spraying mechanism. If it is placed too close to the spraying mechanism, the outlet of the recovery device 2 is easily wetted by the surrounding atomized slurry or high-humidity air. The wet powder tends to stick and accumulate at the outlet of the recovery device 2, eventually causing blockage. This prevents the powder from contacting the slurry droplets evenly, affecting the bonding effect between the powder and the slurry. However, if it is too far from the spraying mechanism, the powder does not have enough kinetic energy to rush towards and impact the slurry droplets. In addition, the longer fusion path makes it easy for the powder to be carried away by the airflow during the fall, resulting in low powder-increasing efficiency and failing to effectively increase the target particle size. In order to better bond the recovered powder with the slurry droplets, the outlet position of the recovery device 2 is limited in this invention, wherein the vertical distance between the outlet position of the recovery device 2 and the spraying mechanism is L1. in Where k is the empirical coefficient for height, and H is the height of spray tower 1. The average upward velocity of the hot air. These represent the slurry volumetric flow rate and density, respectively.

[0031] The horizontal distance between the outlet of the recycling device 2 and the spraying mechanism is L2; ,in , where is an empirical coefficient for horizontal distance, D is the diameter of spray tower 1, and C is the designed capacity.

[0032] In this configuration, the height distance takes into account the slurry volumetric flow rate and density. Based on the slurry volumetric flow rate and density, information such as the water content of the slurry can be determined. Combined with the height empirical coefficient analyzed by the fluid dynamics (CFD) model, it is possible to effectively predict at what height the slurry droplets will just form. At the same time, the influence of the hot air output from the heat source device 7 is also taken into account to correct the height distance.

[0033] In terms of horizontal distance, considering the design of production capacity, when the production capacity is smaller, the output of slurry will decrease, and the slurry droplets will move closer to the middle of the spray tower 1. At this time, it is necessary to increase the horizontal distance so that the powder can come into contact with more slurry droplets, and vice versa.

[0034] Preferably, the heat source device 7 includes a hot air furnace 71, an air duct 72, and a fan 73; The top of the hot blast furnace 71 is connected to an air duct 72, the other end of which is connected to the top of the spray tower 1. The bottom of the hot blast furnace 71 is connected to a fan 73, which is used to supply air to the hot blast furnace 71.

[0035] Fuel can be burned inside the hot air furnace 71 to provide air temperature, and then air is delivered to the hot air furnace 71 by the fan 73. Under the action of the air, the heated air enters the spray tower 1 through the air duct 72 to dry the slurry droplets.

[0036] Preferably, the recycling device 2 includes an integrated chamber 21, multiple connectors 22, and an integrated pipe 23; The inlet of the integrated chamber 21 is connected to the spray tower 1 via the first pipe 5. A connector 22 is provided at the bottom of the integrated chamber 21, which is connected to the input end of the negative pressure component 3. The output end of the negative pressure component 3 is connected to the integrated pipe 23. The input end of the integrated pipe 23 is connected to the blowing component 4, and the output end of the integrated pipe 23 is connected to the spray tower 1. Specifically, the outlet of the integrated pipe 23 is equal to the outlet of the recovery device 2, and the outlet of the integrated pipe 23 needs to be located above the spraying mechanism.

[0037] The negative pressure component 3 is generally a silo pump that can generate a large negative pressure. If the negative pressure component 3 and the spray tower 1 are directly connected by a pipe, the negative pressure generated will be difficult to adjust. Moreover, the larger negative pressure will adsorb a larger volume and more powder. At the same time, the smaller pipe has a faster internal flow rate, which makes it easier for the powder to rub against the inner wall of the pipe, making it difficult to maintain a stable flow rate. This will aggravate the occurrence of pipe blockage and make it impossible to use continuously.

[0038] Therefore, in this invention, an integrated chamber 21 is provided. By increasing the volume of the negative pressure zone through the integrated chamber 21, the cross-sectional area of ​​the flow increases, and the flow velocity of the powder in the pipe and the integrated chamber 21 decreases, but the powder flows more smoothly in the pipe. The larger integrated chamber 21 also prevents powder blockage. After passing through the integrated chamber 21, the powder is conveyed to the output end of the negative pressure component 3 through the connector 22. At this time, multiple connectors 22 and negative pressure components 3 can be provided. The magnitude of the negative pressure in the integrated chamber 21 is adjusted by starting and stopping different negative pressure components 3 to adapt to different production environments. Finally, the output end of the negative pressure component 3 is connected to the integrated pipe 23, which collects all the powder. The blowing component 4 is connected to the input end of the integrated pipe 23, so that the powder can be uniformly blown into the spray tower 1.

[0039] Preferably, the connector 22 includes a flap valve 221, a three-way pipe 222, a third connecting pipe 223, a first connecting pipe 224, a second connecting pipe 225, and a slurry tank 226; The bottom of the integrated chamber 21 is connected to the input end of the flap valve 221. The output end of the flap valve 221 is connected to the input end of the three-way pipe 222. One output end of the three-way pipe 222 is connected to the input end of the first connecting pipe 224. The other output end of the three-way pipe 222 is connected to the input end of the third connecting pipe 223. The output end of the third connecting pipe 223 is connected to the slurry tank 226. The output end of the first connecting pipe 224 is connected to the input end of the negative pressure component 3. The third connecting pipe 223 and the first connecting pipe 224 are respectively equipped with a first solenoid valve and a second solenoid valve. The flap valve 221 is equipped with a gravity sensor, and the gravity sensor is electrically connected to the first solenoid valve and the second solenoid valve respectively. The output end of the negative pressure component 3 is connected to the input end of the second connecting pipe 225, and the output end of the second connecting pipe 225 is connected to the integrated pipe 23.

[0040] Some larger particles of powder may enter the integration chamber 21, and these larger particles may clog the first connecting pipe 224 connecting the integration chamber 21 and the negative pressure. Therefore, this invention includes a flap valve 221, which is a weighted flap valve 221. The weighted flap valve 221 opens and closes periodically. When the flap valve 221 opens, the first solenoid valve opens and the second solenoid valve closes, creating a negative pressure that attracts powder particles, causing them to fall onto the flap valve 221. A gravity sensor is installed on the flap valve 221 to detect the weight of the powder particles. If the weight exceeds a threshold, it indicates that a large amount of powder particles entered the chamber during the current opening and closing cycle. If the powder is fed into the first connecting pipe 224 via the flap valve 221, it may clog the first connecting pipe 224 and the integrated pipe 23 due to excessive powder volume, preventing continuous powder recovery. Therefore, when the weight of the powder on the flap valve 221 exceeds the threshold, it sends an open signal to the second solenoid valve and a close signal to the first solenoid valve. At this time, the powder will enter the third connecting pipe 223 through the three-way pipe 222. The third connecting pipe 223 is connected to the slurry tank 226, where the powder enters for re-slurrying. When the weight of the powder on the flap valve 221 is less than the threshold, it indicates that the current powder is likely a small-volume powder. Therefore, it sends an open signal to the first solenoid valve and a close signal to the second solenoid valve. At this time, the powder will enter the first connecting pipe 224 through the three-way pipe 222, and then be blown from the integrated pipe 23 into the spray tower 1 by the blowing component 4.

[0041] By setting the connector 22, blockage can be effectively prevented, allowing powder recycling to continue.

[0042] The opening times of the multiple connecting parts 22 are spaced out, and the multiple flap valves 221 open sequentially. At least one flap valve 221 must be open at any given time to ensure that the recycling device 2 can continuously recycle powder.

[0043] Preferably, the connector 22 further includes a funnel 227, and the bottom of the integration chamber 21 is provided with a funnel 227. Multiple funnels 227 are arranged in sequence, and the funnel 227 is connected to the input end of the flap valve 221.

[0044] Because multiple flap valves 221 in this invention open sequentially, at least one flap valve 221 is open at any given time. This causes some powder to fall to the bottom of the integration chamber 21 due to inertia. The powder at the bottom of the accumulation chamber then easily enters the integration pipe 23 through the momentarily opening and closing flap valves 221, causing some powder to accumulate in the integration chamber 21, which requires workers to clean it out, wasting time.

[0045] Therefore, in this invention, the bottom of the integrated chamber 21 is not set with a bottom plate, but is formed by multiple funnels 227 arranged in sequence. In this way, the powder will only fall onto the funnels 227. Under the action of gravity and the funnels 227, the powder enters the flap valve 221. When the flap valve 221 is opened, enough powder can be sucked up.

[0046] Preferably, a pressure sensor is provided inside the integrated tube 23, and the pressure sensor is located on the side near the blowing element 4 to detect the pressure inside the integrated tube 23.

[0047] Although a connector 22 is provided, large particles of powder may still enter the integrated tube 23, causing blockage. To detect blockages immediately, a pressure sensor is installed inside the integrated tube 23. When a blockage occurs, the pressure in the section of the integrated tube 23 from the blockage point to the blowing element 4 increases. Upon detecting abnormal pressure, the pressure sensor will send an alarm to the management personnel, alerting them to come for repairs.

[0048] Preferably, it also includes a separator 6, which is disposed in the first pipe 5. The separator 6 has a first outlet 612 and a second outlet 613. The first outlet 612 is connected to the recovery device 2, and the second outlet 613 is connected to the discharge port. The separator 6 is used to screen powders of different sizes. Large-sized powders are output from the second outlet 613, and small-sized powders are output from the first outlet 612.

[0049] To further ensure that large particles of powder do not enter the integrated pipe 23 and affect the powder conveying, and because larger dust particles are difficult to combine with the droplets and cannot be re-granulated. Figures 3-4 As shown, a separator 6 is provided in this invention. The separator 6 is located in front of the integration chamber 21. When the powder enters the separator 6, it will be separated by the separator 6. The first outlet 612 and the second outlet 613 of the separator 6 will output powder of different specifications. The smaller powder enters the integration chamber 21 from the first outlet 612, while the larger powder enters the discharge port through the second outlet 613 and is output as a finished product.

[0050] Preferably, the separator 6 includes a separation chamber 61, a fixing member 62, and a blade 63; The separation chamber 61 includes an air inlet 611, a first outlet 612, and a second outlet 613; The air inlet 611 and the first outlet 612 are arranged facing each other on the front and rear sides of the separation chamber 61. The separation chamber 61 has an annular chamber 614 on the side near the first outlet 612. The diameter of the annular chamber 614 is larger than the diameter of the first outlet 612. The second outlet 613 is located at the bottom of the annular chamber 614. The fixing member 62 is coaxially arranged with the separation chamber 61. The tail end of the fixing member 62 is flush with the front edge of the annular chamber. The outer shell of the fixing member 62 is provided with inclined blades 63 evenly distributed along its circumferential direction. The tail end of the blades 63 is flush with the tail end of the fixing member 62. There is a gap between the upper edge of the blade 63 and the inner wall of the separation chamber 61.

[0051] In this invention, the separator 6 uses centrifugal separation to separate large and small powder particles. When the powder enters the separation chamber 61, it comes into contact with the fixed component 62 at a certain speed. The paddle 63 is inclined, and the powder moves centrifugally along the paddle 63 under the guidance of the inclined paddle 63, gradually moving towards the first outlet 612. The larger powder particles are relatively heavier and have greater inertia. When leaving the paddle 63, the smaller powder particles enter the first outlet 612 under negative pressure. The larger powder particles enter the annular chamber 614 due to inertia and undergo centrifugal motion. The diameter of the annular chamber 614 is larger than the diameter of the first outlet 612, which can prevent the larger powder particles from entering the first outlet 612 under inertia. When the inertia gradually disappears and cannot easily counteract gravity, the larger powder particles fall to the bottom of the annular chamber 614, and then enter the discharge port through the second outlet 613, and enter the finished product area through the discharge port. In one embodiment, the gap between the upper edge of the paddle 63 and the inner wall of the separation chamber 61 is determined according to the size of the powder being screened. If the powder is spherical after molding, it is necessary to screen out powder with a volume of 10 cubic centimeters. Powder with a volume of less than 10 cubic centimeters is re-slurryed, while powder with a volume of more than 10 cubic centimeters enters the finished product area through the separator 6. At this time, it is necessary to make the powder with a volume of more than or equal to 10 cubic centimeters move centrifugally along the paddle 63, so that it cannot pass through or get stuck in the gap between the upper edge of the paddle 63 and the inner wall of the separation chamber 61. Therefore, the gap between the upper edge of the paddle 63 and the inner wall of the separation chamber 61 can be set to less than 2.67 cm. By setting a gap between the upper edge of the paddle 63 and the inner wall of the separation chamber 61, small-sized powder can be more smoothly adsorbed into the first outlet 612 under negative pressure.

[0052] A granulation method, applied to the aforementioned continuous granulation equipment, includes the following steps: Step S1: Start the spraying mechanism, recovery device, and heat source device; Step S2: The granulation material is prepared into a slurry; the slurry is transported to the spraying mechanism by a pump; Step S3: The slurry is sprayed into the spray tower in the form of droplets under the action of the spraying mechanism; Step S4: The slurry droplets are dried by hot air to form particles. When the particles that meet the size specifications pass through the inlet of the recycling device, they overcome the negative pressure and fall from the outlet of the spray tower under the action of gravity. Powder smaller than the specified size is sucked into the recovery device under negative pressure, and the recovery device transports the powder back into the spray tower to recombine with the slurry droplets. Step S5: Repeat steps S2 to S4 until the granulation material is used up, then turn off the spraying mechanism, the recovery device, and the heat source device.

[0053] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0054] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A continuous granulation device, characterized in that, It includes a spray tower (1), a heat source device (7), and a recovery device (2); The spray tower (1) is provided with a spraying mechanism and a discharge port at the top and bottom respectively, and the input end of the spraying mechanism is connected to the slurry. The heat source device (7) acts on the top of the spray tower (1) and delivers heat to the spray tower (1); The inlet and outlet of the recycling device (2) are connected to the spray tower (1) respectively, and the outlet of the recycling device (2) is located on the side of the spraying mechanism; the inlet of the recycling device (2) is located below the discharge port. The recovery device (2) is equipped with an adsorption mechanism, which is used to draw the powder in the spray tower (1) into the recovery device (2) by using negative pressure; the adsorption mechanism includes a negative pressure component (3) and a blowing component (4), the negative pressure component (3) is connected to the inlet of the recovery device (2), and the negative pressure component (3) is used to generate negative pressure to adsorb the powder in the spray tower (1) and transport it to the blowing component (4); The blowing component (4) is connected to the negative pressure component (3), and the blowing component (4) is used to provide air force to send the powder into the outlet of the recycling device (2); The heat source device (7) includes a hot air furnace (71), an air duct (72), and a fan (73); The top of the hot blast stove (71) is connected to a duct (72), the other end of which is connected to the top of the spray tower (1). The bottom of the hot blast stove (71) is connected to a fan (73), which is used to deliver air to the hot blast stove (71). The recycling device (2) includes an integrated chamber (21), multiple connectors (22), and an integrated pipe (23); The inlet of the integrated chamber (21) is connected to the spray tower (1) through the first pipe (5). A connector (22) is provided at the bottom of the integrated chamber (21). The connector (22) is connected to the input end of the negative pressure component (3). The output end of the negative pressure component (3) is connected to the integrated pipe (23). The input end of the integrated pipe (23) is connected to the blowing component (4). The outlet of the integrated pipe (23) is connected to the spray tower (1). The connector (22) includes a flap valve (221), a three-way pipe (222), a third connecting pipe (223), a first connecting pipe (224), a second connecting pipe (225), and a slurry tank (226). The bottom of the integrated chamber (21) is connected to the input end of the flap valve (221), the output end of the flap valve (221) is connected to the input end of the three-way pipe (222), one output end of the three-way pipe (222) is connected to the input end of the first connecting pipe (224), the other output end of the three-way pipe (222) is connected to the input end of the third connecting pipe (223), the output end of the third connecting pipe (223) is connected to the slurry tank (226), and the output end of the first connecting pipe (224) is connected to the input end of the negative pressure component (3). The third connecting pipe (223) and the first connecting pipe (224) are respectively provided with a first solenoid valve and a second solenoid valve. The flap valve (221) is provided with a gravity sensor. The gravity sensor is electrically connected to the first solenoid valve and the second solenoid valve respectively. The output end of the negative pressure component (3) is connected to the input end of the second connecting pipe (225), and the output end of the second connecting pipe (225) is connected to the integrated pipe (23).

2. The continuous granulation equipment according to claim 1, characterized in that, The connector (22) also includes a funnel (227). The bottom of the integrated chamber (21) is provided with a funnel (227). Multiple funnels (227) are arranged in sequence. The funnel (227) is connected to the input end of the flap valve (221).

3. A continuous granulation device according to claim 1 or 2, characterized in that, A pressure sensor is installed inside the integrated tube (23). The pressure sensor is located on the side near the blowing component (4) and is used to detect the pressure inside the integrated tube (23).

4. The continuous granulation equipment according to claim 2, characterized in that, It also includes a separator (6), which is disposed in the first pipeline (5). The separator (6) has a first outlet (612) and a second outlet (613). The first outlet (612) is connected to the recycling device (2), and the second outlet (613) is connected to the discharge port. The separator (6) is used to screen powders of different sizes. Large-sized powders are output from the second outlet (613), and small-sized powders are output from the first outlet (612).

5. A continuous granulation device according to claim 4, characterized in that, The separator (6) includes a separation chamber (61), a fixed component (62), and a blade (63); The separation chamber (61) includes an air inlet (611), a first outlet (612), and a second outlet (613). The air inlet (611) and the first outlet (612) are arranged facing each other on the front and rear sides of the separation chamber (61). The separation chamber (61) has an annular chamber (614) on the side near the first outlet (612). The diameter of the annular chamber (614) is larger than the diameter of the first outlet (612). The second outlet (613) is located at the bottom of the annular chamber (614). The fixing member (62) is coaxially arranged with the separation chamber (61), and the tail end of the fixing member (62) is flush with the front edge of the annular chamber (614). The outer shell of the fixing member (62) is provided with inclined blades (63) evenly distributed along its circumferential direction, and the tail end of the blades (63) is flush with the tail end of the fixing member (62). There is a gap between the upper edge of the blade (63) and the inner wall of the separation chamber (61).

6. A granulation method, applied to a continuous granulation apparatus according to any one of claims 1 to 5, characterized in that, Includes the following steps: Step S1: Start the spraying mechanism, recovery device, and heat source device; Step S2: The granulation material is prepared into a slurry; the slurry is transported to the spraying mechanism by a pump; Step S3: The slurry is sprayed into the spray tower in the form of droplets under the action of the spraying mechanism; Step S4: The slurry droplets are dried by hot air to form particles. When the particles that meet the size specifications pass through the inlet of the recycling device, they overcome the negative pressure and fall from the outlet of the spray tower under the action of gravity. Powder smaller than the specified size is sucked into the recovery device under negative pressure, and the recovery device transports the powder back into the spray tower to recombine with the slurry droplets. Step S5: Repeat steps S2 to S4 until the granulation material is used up, then turn off the spraying mechanism, the recovery device, and the heat source device.

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