Potassium fluoride multi-stage drying device and method

Abstract

The present invention provides a potassium fluoride multi-stage drying device and method, which relates to the technical field of spray drying equipment. It includes a shell, a telescopic barrel, an air intake assembly and a driving connection structure. An upper drying chamber with an opening facing downward is formed inside the shell, and a feed assembly is provided on the top of the shell; the telescopic barrel is arranged inside the shell, and a lower drying chamber with an opening facing upward is formed inside the telescopic barrel, and the lower drying chamber cooperates with the upper drying chamber to form a drying chamber, and during the movement of the telescopic barrel relative to the shell, the cavity opening of the lower drying chamber can scrape off the material on the inner wall of the upper drying chamber; the air intake assembly is used to dry the material in the drying chamber and purge the inner wall of the drying chamber; the driving connection structure connects the telescopic barrel and the air intake assembly, and is used to control the purge angle of the air intake assembly as the telescopic barrel moves to purge the inner wall of the drying chamber. By arranging the air intake assembly to purge the inner wall surface, the material adhesion to the inner wall surface is reduced; the telescopic barrel can scrape the inner wall surface of the upper drying chamber, reduce the number of shutdowns for cleaning, and have higher work efficiency.

Description

Technical Field

[0001] The invention relates to a spray drying device, in particular to a potassium fluoride multi-stage drying device and method. Background Art

[0002] In related technologies, potassium fluoride has a wide range of applications, such as: in industrial fields for glass processing, electroplating, welding, organic synthesis, and as a catalyst, etc.; in the agricultural field for the preparation of pesticides, as a fertilizer additive, etc.; in the field of analytical chemistry as an analytical reagent, complex former, etc. In the process of manufacturing potassium fluoride, potassium fluoride needs to be dried. Currently, potassium fluoride is dried mainly by spray drying and hot air drying. Hot air drying is a single drying method, while spray drying can achieve multi-stage drying in the same device, with better and more thorough drying effects.

[0003] However, spray drying is prone to wall sticking during the drying process, which brings great difficulties to the later cleaning. Therefore, in order to solve the problems existing in the existing potassium fluoride drying technology, it is necessary to propose a new potassium fluoride drying technology solution. Summary of the invention

[0004] Based on this, it is necessary to provide a potassium fluoride multi-stage drying device and method to address the problem of wall sticking that easily occurs during the current potassium fluoride multi-stage drying process.

[0005] The above purpose is achieved through the following technical solutions:

[0006] In a first aspect, the present invention provides a potassium fluoride multi-stage drying device, comprising a housing, a telescopic barrel, an air intake assembly and a drive connection structure;

[0007] An upper drying chamber with an opening facing downward is formed inside the shell, and a feed assembly is provided on the top of the shell;

[0008] The telescopic barrel is arranged in the shell and can move relative to the shell, and a drying lower chamber with an upward opening is formed in the telescopic barrel. The drying lower chamber cooperates with the drying upper chamber to form a drying chamber, and when the telescopic barrel moves relative to the shell, the opening of the drying lower chamber can scrape off the material on the inner wall of the drying upper chamber;

[0009] The air intake assembly is used to dry the material in the drying chamber and purge the inner wall of the drying chamber;

[0010] The driving connection structure connects the telescopic barrel and the air intake assembly, and is used to control the blowing angle of the air intake assembly as the telescopic barrel moves to blow the inner wall of the drying chamber.

[0011] Furthermore, the air intake assembly includes: a hot air inlet arranged around the circumference of the feed assembly, and an auxiliary nozzle arranged around the inner circumferential wall of the upper drying chamber.

[0012] Furthermore, an annular inner cavity is formed on the top of the shell and is opened around the feeding assembly, and the hot air inlet is opened on one side of the annular inner cavity corresponding to the feeding assembly.

[0013] Furthermore, the air intake assembly also includes a hot air blower and an air intake duct;

[0014] The air inlet duct is connected between the hot air blower outlet and the annular inner cavity.

[0015] Furthermore, the auxiliary nozzle is rotatably arranged on the inner peripheral wall of the drying upper chamber, and the air intake assembly further includes an auxiliary air intake pipe for balancing and distributing the gas delivered to the auxiliary nozzle;

[0016] Wherein, the air outlet end of the auxiliary air inlet pipe is connected to the auxiliary nozzle through a first pipe, and the air inlet end of the auxiliary air inlet pipe is connected to the annular inner cavity through a second pipe.

[0017] Further, the feed assembly includes a feed port and a nozzle;

[0018] The feed port is used to convey materials, wherein the inner diameter of the feed port gradually decreases along the direction from the first end to the second end of the feed port;

[0019] The spray head is arranged at the second end of the feed inlet and is used for spraying the material.

[0020] Furthermore, the telescopic barrel is formed with an inner barrel wall and an outer barrel wall;

[0021] A matching groove is formed between the inner barrel wall and the outer barrel wall, and the matching groove is used to embed the cavity wall plate of the drying upper chamber. The inner side of the outer barrel wall is provided with a thread, and the thread cooperates with the thread groove on the outer side of the cavity wall plate of the drying upper chamber, so that the telescopic barrel can rotate synchronously around its axis when the telescopic barrel moves relative to the shell.

[0022] Further, the driving connection structure includes a lower telescopic rod, an upper telescopic rod and a gear ring;

[0023] The lower end telescopic rod is arranged on the outside of the telescopic barrel;

[0024] One end of the upper telescopic rod is slidably arranged on the housing, and the other end is slidably connected to the lower telescopic rod;

[0025] The gear ring is sleeved on the outer peripheral side of the drying upper chamber and connected to the upper telescopic rod, wherein the matching teeth of the gear ring are meshed with the bevel gear of the auxiliary nozzle in the air intake assembly;

[0026] When the telescopic barrel drives the lower telescopic rod to move, the lower telescopic rod can drive the upper telescopic rod and the gear ring to rotate around the outer circumference of the upper drying chamber to adjust the jet angle of the auxiliary nozzle.

[0027] Furthermore, the drying device also includes a cylinder and a bellows expansion pipe;

[0028] The cylinder is connected to the telescopic barrel through a lifting plate, and is used to drive the telescopic barrel to move;

[0029] One end of the bellows telescopic tube is connected to the barrel bottom of the telescopic barrel, and the other end is connected to the collecting device.

[0030] In a second aspect, the present invention further provides a multi-stage drying method for potassium fluoride, wherein the drying method uses the drying device described in any of the above methods for drying; the method comprises:

[0031] The hot air blower is started to supply air to the drying chamber to dry the material, including: controlling the air supply amount and the feeding amount of the material, and sequentially performing four processes of rapid drying, constant speed drying, speed reduction drying and temperature increase drying on the material;

[0032] During the drying process, controlling the telescopic barrel to move relative to the shell;

[0033] After drying, the dried material is collected.

[0034] The beneficial effects of the present invention are:

[0035] The potassium fluoride multi-stage drying device provided by the present invention forms an air flow wall on the inner wall surface by arranging the air intake assembly, thereby reducing the probability of materials contacting the inner wall surface, thereby reducing the adhesion of materials to the inner wall surface, and subsequent cleaning is simpler; the drying chamber is formed by the cooperation of a telescopic barrel and a shell, and the telescopic barrel can be telescopically moved upward to scrape the inner wall surface of the upper drying chamber to clean up the residual materials on the inner wall, without stopping the machine separately to clean the materials, and the work efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 The overall schematic diagram of a potassium fluoride multi-stage drying device according to an embodiment of the present invention is as follows Figure 1 ;

[0037] Figure 2 The overall schematic diagram of a potassium fluoride multi-stage drying device according to an embodiment of the present invention is as follows Figure 2 ;

[0038] Figure 3for Figure 2 AA section view;

[0039] Figure 4 for Figure 3 A partial schematic diagram of part A;

[0040] Figure 5 The overall schematic diagram of a potassium fluoride multi-stage drying device according to an embodiment of the present invention is as follows Figure 3 ;

[0041] Figure 6 for Figure 5 BB cross-sectional view;

[0042] Figure 7 This is a schematic diagram of a telescopic barrel according to an embodiment of the present invention;

[0043] Figure 8 A schematic diagram of a housing according to an embodiment of the present invention;

[0044] Fig. 9 for Figure 8 Schematic diagram of CC cross-section;

[0045] Fig.10 for Fig. 9 A partial schematic diagram of part B;

[0046] Fig.11 FIG. 1 is a schematic diagram of a ring gear according to an embodiment of the present invention.

[0047] Wherein: 100, shell; 101, feed port; 102, hot air blower; 103, inspection port; 104, collection device; 105, hot air inlet; 106, nozzle; 107, auxiliary air inlet pipe; 1071, hose; 1072, hard pipe; 108, ball joint; 109, matching port; 1091, threaded hole; 110, placement slot; 111, threaded slot; 200, telescopic structure; 201, upper telescopic rod; 20 11. Ball joint; 2012. Telescopic slot; 300. Auxiliary nozzle; 301. Bevel gear; 400. Nozzle mounting plate; 401. Mounting hole; 500. Telescopic barrel; 501. Lower end telescopic rod; 502. Lifting plate; 503. Thread; 504. Matching slot; 505. Inner barrel wall; 506. Outer barrel wall; 600. Corrugated telescopic tube; 700. Cylinder; 800. Gear ring; 801. Matching plate; 802. Matching teeth. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0049] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0050] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0051] In an exemplary embodiment of the present invention, a potassium fluoride multi-stage drying device is provided, such as Figure 1-Figure 3 As shown, the potassium fluoride multi-stage drying device includes a housing 100, a telescopic barrel 500, a collecting device 104, an air intake assembly and a driving connection structure.

[0052] The housing 100 has a downwardly opening drying upper chamber formed inside, and a feed assembly is provided on the top of the housing 100. The housing 100 has a cylindrical structure, and an inspection port 103 can be provided at the lower part of the side wall of the housing 100 for easy maintenance and disassembly of various structures.

[0053] The telescopic barrel 500 is disposed in the shell 100 and can move relative to the shell 100. A drying lower chamber with an opening facing upward is formed in the telescopic barrel 500. The drying lower chamber cooperates with the drying upper chamber to form a drying chamber. Since the barrel wall diameter of the telescopic barrel 500 is smaller than the inner diameter of the drying upper chamber, the telescopic barrel 500 is partially embedded in the drying upper chamber. During the movement of the telescopic barrel 500 relative to the shell 100, the cavity opening of the drying lower chamber can scrape off the material on the inner wall of the drying upper chamber. It should be noted that the matching size between the diameter of the telescopic barrel 500 and the diameter of the drying upper chamber satisfies that the telescopic barrel 500 is just embedded in the drying upper chamber and that the telescopic barrel 500 can slide in the drying upper chamber. The gap between the two should not be too large. The specific size difference can be designed according to actual needs and will not be repeated here.

[0054] The air intake assembly is used to dry the material in the drying chamber and purge the inner wall of the drying chamber. The air intake assembly is arranged at the upper part of the drying upper chamber, and its air outlet direction corresponds to the feed assembly at the top of the housing 100 and the inner wall of the drying upper chamber, so as to form an air flow wall while drying the material and reduce the probability of the material contacting the inner wall of the drying chamber.

[0055] The drive connection structure connects the telescopic barrel 500 and the air intake assembly, and can control the purge angle of the air intake assembly to purge the inner wall of the drying chamber as the telescopic barrel 500 moves. In order to achieve control of the air intake assembly and prevent the drive connection structure from affecting the material drying, the drive connection structure needs to be set outside the drying chamber. For example, Figure 1-Figure 3 , Figure 9-10 As shown, the upper drying chamber is a cylindrical structure formed in the housing 100, and a placement groove 110 is formed between the upper drying chamber wall and the outer wall of the housing for connecting the corresponding end of the drive connection structure. Similarly, the drive connection structure is used to connect one end of the telescopic barrel 500 and is located outside the telescopic barrel 500. For the specific connection method, please refer to the corresponding description below, which will not be repeated here.

[0056] The collecting device 104 is used to collect the dried material after the material is dried to a corresponding standard. Specifically, the collecting device 104 is connected to the telescopic barrel 500, and the material collection is controlled by a suction device arranged between the collecting device 104 and the telescopic barrel 500.

[0057] In this embodiment, an air intake assembly is arranged to form an airflow wall on the inner wall of the drying chamber, thereby reducing the probability of materials contacting the inner wall of the drying chamber, thereby reducing the adhesion of materials to the inner wall of the drying chamber, and subsequent cleaning is simpler; the drying chamber is formed by the telescopic barrel 500 and the upper drying chamber in the shell 100, and the telescopic barrel 500 can be telescopically moved upward to scrape the inner wall of the upper drying chamber to clean up the residual materials on the inner wall, without stopping the machine separately to clean the materials, and the work efficiency is higher.

[0058] In some alternative embodiments, such as Figure 3-Figure 4 As shown, in order to dry the material and prevent the sprayed material from adhering to the inner wall of the drying chamber, hot air inlets 105 and auxiliary nozzles 300 are arranged at corresponding positions of the drying chamber. Exemplarily, the air intake assembly includes: hot air inlets 105 arranged around the circumference of the feed assembly, and auxiliary nozzles 300 arranged around the inner circumferential wall of the upper drying chamber. The number of hot air inlets 105 can be determined in combination with factors such as the air intake volume and the size structure of the feed assembly; the number of auxiliary nozzles 300 can be selected in combination with the air intake volume and the size of the drying chamber.

[0059] In some alternative embodiments, such as Figure 3As shown, in order to ensure the drying effect, the hot air inlet 105 is arranged above the discharge end of the feed assembly, and the hot air output by the hot air inlet 105 forms a circle of drying airflow around the feed assembly, and flows from top to bottom to dry the material. Exemplarily, an annular inner cavity is formed at the top of the shell 100 around the feed assembly, and the hot air inlet 105 is opened on the side wall of the feed assembly corresponding to the annular inner cavity. In addition, based on the annular inner cavity set at the top of the shell 100, the intake volume can be centrally distributed so that the air volume of each hot air inlet 105 is as balanced as possible.

[0060] Furthermore, the air intake component also includes: a hot air blower 102 and an air intake pipe, the air intake pipe connects the outlet of the hot air blower 102 and the annular inner cavity, the hot air blower 102 outputs hot air, and the hot air enters 105 through the air intake pipe and blows toward the feed component.

[0061] In some alternative embodiments, such as Figure 3-Figure 4 , Figure 6 As shown, in order to ensure that the inner wall of the drying chamber can be fully purged by the auxiliary nozzle 300, the auxiliary nozzle 300 is rotatably arranged on the inner peripheral wall of the drying upper chamber, and the air intake assembly also includes: an auxiliary air intake pipe 107, which is used to balance and distribute the gas delivered to the auxiliary nozzle 300. Among them, the air outlet end of the auxiliary air intake pipe 107 is connected to the auxiliary nozzle 300 through the first air pipe, and the air intake end of the auxiliary air intake pipe 107 is connected to the annular inner cavity through the second air pipe. Optionally, the first air pipe is a hose 1071, which can ensure that the auxiliary nozzle 300 can rotate flexibly; the second air pipe is a hard pipe 1072, which can ensure the stability of the installation position of the auxiliary air intake pipe 107 inside the drying chamber.

[0062] Optionally, when fixing the auxiliary nozzle 300, considering that the auxiliary nozzle 300 needs to be able to rotate and be driven by the driving connection structure outside the drying chamber, the fixing method of the auxiliary nozzle 300 is optimized. Figure 3-Figure 4 , Figure 6 , Figure 9-10 As shown, the auxiliary nozzle 300 is installed on the drying upper chamber through the nozzle mounting plate 400. Specifically, a matching port 109 is provided on the drying upper chamber, and a threaded hole 1091 is provided around the matching port 109; the fixed end of the auxiliary nozzle 300 is inserted into the mounting hole 401 of the nozzle mounting plate 400 and can rotate relative to the nozzle mounting plate 400, and the nozzle mounting plate 400 is fixed to the matching port 109 of the drying upper chamber by screws. In addition, a bevel gear 301 is provided at the portion of the fixed end of the auxiliary nozzle 300 that passes through the nozzle mounting plate 400.

[0063] In some optional ways, in order to achieve spraying of materials and diversion of the hot air inlet 105, the structure of the feed assembly can be optimized. Figure 1-Figure 3As shown, the feed assembly includes: a feed port 101 and a nozzle 106. The feed port 101 is used to convey materials, wherein the inner diameter of the feed port 101 gradually decreases along the direction from the first end to the second end of the feed port 101; the nozzle 106 is arranged at the second end of the feed port 101, and is used to spray the materials. In this embodiment, by designing the outer peripheral surface of the feed port 101 as a conical surface, the hot air output from the hot air inlet 105 corresponding to the peripheral side thereof can be quickly guided to the position of the nozzle 106, and when the nozzle 106 sprays out the material, the hot air can quickly dry it.

[0064] In some alternative embodiments, such as Figure 5-Figure 10 As shown, the telescopic barrel 500 is formed with an inner barrel wall 505 and an outer barrel wall 506. A matching groove 504 is formed between the inner barrel wall 505 and the outer barrel wall 506, and the matching groove 504 is used to embed the cavity wall plate of the drying upper chamber. The inner side of the outer barrel wall 506 is provided with a thread 503, and the thread 503 cooperates with the thread groove 111 on the outer side of the cavity wall plate of the drying upper chamber, so that the telescopic barrel 500 can rotate synchronously around its axis when the telescopic barrel 500 moves relative to the housing 100. On the one hand, the airtightness of the drying chamber can be ensured, and on the other hand, the rotation of the telescopic barrel 500 can be realized to reduce the occurrence of material sticking to the wall.

[0065] In some optional embodiments, considering the telescopic movement of the telescopic barrel 500, the auxiliary nozzle 300 is synchronously controlled when the telescopic barrel 500 is driven by the cylinder 700. Figure 3-Figure 6 , Fig.11 As shown, the driving connection structure includes: a lower telescopic rod 501, an upper telescopic rod 201 and a gear ring 800, etc.

[0066] The lower telescopic rod 501 is connected to the telescopic barrel 500 as a connecting piece, wherein the lower telescopic rod 501 is arranged on the outer barrel wall 506 of the telescopic barrel 500. The upper telescopic rod 201 is used as a connecting piece connected to the placement slot 110, one end of the upper telescopic rod 201 is slidably arranged on the housing 100, and the other end is slidably connected to the lower telescopic rod 501. The upper telescopic rod 201 cooperates with the lower telescopic rod 501 to form a telescopic structure 200. Exemplarily, a ball joint 2011 is formed at the upper end of the upper telescopic rod 201, which cooperates with the ball interface 108 in the placement slot 110 to realize the sliding connection between the two; the lower end of the upper telescopic rod 201 is provided with a telescopic slot 2012, and the telescopic slot 2012 is used to sleeve the lower telescopic rod 501. The gear ring 800 is sleeved on the outer peripheral side of the drying upper chamber as a transmission part, and a matching plate 801 is provided on the gear ring 800 . The matching plate 801 is connected to the upper end telescopic rod 201 , wherein the matching teeth 802 of the gear ring 800 are meshed with the bevel gear 301 of the auxiliary nozzle 300 .

[0067] In this embodiment, when the telescopic barrel 500 drives the lower telescopic rod 501 to move, the lower telescopic rod 501 can drive the upper telescopic rod 201 and the gear ring 800 to rotate around the outer circumference of the upper drying chamber to adjust the jet angle of the auxiliary nozzle 300.

[0068] In some alternative embodiments, such as Figure 6 As shown, the potassium fluoride multi-stage drying device also includes a cylinder 700 and a bellows telescopic tube 600. The cylinder 700 is movably connected to the telescopic barrel 500 through a lifting plate 502, and is used to drive the telescopic barrel 500 to move. Specifically, there are two lifting plates 502, which are enclosed into a circular ring plate. The inner ring part of the circular ring plate is limited in a circumferential groove opened on the outer peripheral side of the lower part of the telescopic barrel 500, and the circular ring plate can rotate circumferentially around the telescopic barrel 500. One end of the bellows telescopic tube 600 is connected to the barrel bottom of the telescopic barrel 500, and the other end is connected to the collecting device 104. Based on the flexibility of the bellows telescopic tube 600, it can be telescopically deformed with the movement of the telescopic barrel 500, and the end of the bellows telescopic tube 600 connected to the telescopic barrel 500 is allowed to produce a certain deformation in its circumferential direction. The telescopic barrel 500 is driven to move by the cylinder 700. Based on the matching of the thread groove 111 on the upper drying chamber and the thread 503 on the outer barrel wall 506 of the telescopic barrel 500, it is possible to ensure that the drying chamber has a certain degree of sealing when the telescopic barrel 500 moves relative to the upper drying chamber. In addition, since the thread groove 111 on the upper drying chamber is matched with the thread 503 on the outer barrel wall 506 of the telescopic barrel 500, the telescopic barrel 500 also rotates while moving up and down, exerting a centrifugal effect on the telescopic barrel 500, and improving the air flow disturbance effect inside the drying chamber. When the telescopic barrel 500 moves, the air outlet direction of the air flow wall will change, disturbing the material, ensuring that the material can be dried in the drying chamber for a sufficient time while the volume inside the drying chamber changes, thereby ensuring the drying effect.

[0069] In this embodiment, the assembly process of the drying device is also described. Figure 3-Figure 6 , Figure 9-10As shown, the lower telescopic rod 501 is installed on the telescopic barrel 500 by screws, and there are multiple lower telescopic rods 501; the corresponding upper telescopic rod 201 is slidably connected with the lower telescopic rod 501; then the nozzle mounting plate 400 is installed at the corresponding position of the drying upper chamber by screws; then the installed above-mentioned structure is inserted into the placement groove 110, and then the ball joint 2011 is inserted into the ball interface 108 to limit the position of the upper telescopic rod 201, but the ball joint 2011 can slide in the ball interface 108 and cannot be detached; when the outer barrel wall 506 of the telescopic barrel 500 is inserted into the placement groove 110, the thread 503 is matched with the thread groove 111 at the same time, so that the telescopic barrel 500 can rotate when moving up; then the auxiliary nozzle 300 is inserted into the nozzle mounting plate 400, and then the bevel gear 301 is fixedly matched with the auxiliary nozzle 300; the auxiliary nozzle 300 can rotate on the nozzle mounting plate 400; then the installed nozzle mounting plate 400 The auxiliary air intake pipe 107 is fixed inside by a hard pipe 1072, and the hard pipe 1072 is connected to the air intake pipe; the two ends of the hose 1071 are connected to the auxiliary air intake pipe 107 and the auxiliary nozzle 300 respectively; the bellows telescopic tube 600 is fixed to the telescopic barrel 500, and based on the flexibility of the bellows telescopic tube 600, it can be extended and retracted. The barrel 500 undergoes telescopic deformation during its movement, and allows the end of the bellows telescopic tube 600 connected to the telescopic barrel 500 to produce a certain deformation in its circumferential direction; the lifting plate 502 is assembled from two pieces and is installed on the outside of the telescopic barrel 500; the cylinder 700 is arranged at the bottom of the shell 100 and is fixed to the lifting plate 502 to form a circular ring plate, the inner ring part of the circular ring plate is limited in the circumferential groove opened on the outer peripheral side of the lower part of the telescopic barrel 500, and the circular ring plate can rotate around the telescopic barrel. The cylinder 700 is also fixed to the bottom of the shell 100; the feed port 101 is installed on the upper part of the shell 100, and the nozzle 106 is installed on the feed port 101, and the hot air blower 102 supplies air to the hot air inlet 105 and the auxiliary air inlet pipe 107.

[0070] Based on the introduction of the potassium fluoride multi-stage drying device in the above exemplary embodiment, the present invention further illustrates the specific process of drying potassium fluoride using the above drying device.

[0071] Specifically, the present invention also provides a multi-stage drying method for potassium fluoride, which comprises:

[0072] Step S101, start the hot air blower 102 to supply air to the drying chamber to dry the material;

[0073] Step S102, during the drying process, controlling the telescopic barrel 500 to move relative to the housing 100;

[0074] Step S103, after drying is completed, the dried material is collected.

[0075] In some optional methods, step S102, starting the hot air blower 102 to supply air to the drying chamber to dry the material includes: controlling the air supply and the material feed amount, and sequentially performing four processes of rapid drying, constant speed drying, reduced speed drying and temperature drying on the material.

[0076] Specifically, after the hot air blower 102 is started, air is supplied to the drying chamber; then the material is added to the feed port 101, and the material is sprayed into the drying chamber from the nozzle 106 to form an atomized state; the material completes multi-stage drying in the drying chamber, and the process mainly includes four stages: AB section (rapid drying), BC section (constant speed drying), CD section (speed reduction drying) and DE section (temperature increase drying).

[0077] In the multi-stage drying process, the liquid droplets first enter the AB section, where they begin to contact the hot air and the drying rate is quickly established. The surface temperature of the liquid droplets rises slightly, and the liquid at this time obtains the latent heat of vaporization required for evaporation. This stage is a rapid drying stage, but generally the time required for heat transfer at the droplet-air interface to reach equilibrium is only a few thousandths of a second.

[0078] Then, the droplets enter the BC stage and enter the constant-speed drying stage. The water evaporated in this process is the unbound water around the droplets. Unbound water inside the droplets constantly moves to the surface of the droplets, maintains a saturated state on the surface, and reaches a balance with the water lost by surface vaporization. At this time, the external heat and the evaporated water are balanced on the droplet surface, and the temperature inside the droplets is basically close to the wet-bulb temperature of the air.

[0079] Then comes the CD stage. After the critical point C (i.e. the water that migrates from the inside of the droplet to the surface no longer maintains its saturated wet state), the material enters the deceleration drying stage. In this stage, the vapor pressure on the surface of the material is lower than the saturated vapor pressure of water at the same temperature. The drying rate drops rapidly, and the temperature on the surface of the material gradually rises and begins to approach the temperature of the hot drying air.

[0080] The last is the DE stage. Since the solid surface of the material has been formed, the mass transfer resistance is all on the solid layer. It is difficult for the bound water inside the material to migrate outward and evaporate. The temperature of the solid material will also enter a rapid heating stage. Evaporation continues until the moisture content of the material reaches equilibrium with the surrounding air.

[0081] The material is easy to stick to the wall during the atomization stage. During the atomization stage, based on the auxiliary air inlet pipe 107 and the auxiliary nozzle 300, air is blown to the inner wall of the drying chamber to form an air wall to reduce the material sticking to the wall. When the material sticks to the wall to a certain extent, the cylinder 700 can be controlled to move and push the telescopic barrel 500 upward, so that the telescopic barrel 500 scratches the inner wall of the upper drying chamber during the atomization stage. While the telescopic barrel 500 is pushed upward, the cooperation between the thread 503 and the thread groove 111 makes the telescopic barrel 500 rotate. The rotation can exert a certain centrifugal force on the telescopic barrel 500. The cooperation between the thread 503 and the thread groove 111 can ensure that the drying chamber has a certain sealing performance. The rotation of the telescopic barrel 500 will drive the lower telescopic rod 501 to rotate, and the lower telescopic rod 501 drives the upper telescopic rod 201 to rotate, thereby driving the ring gear 800 to rotate. Because the teeth of the ring gear 800 are broken teeth, the rotation of the ring gear 800 can drive multiple auxiliary nozzles 300 to rotate a certain angle. The air flow inside the device is rotated to increase the drying distance of the material in the barrel, preventing the material from not being completely dried when the axial distance in the barrel becomes shorter; after the scraping is completed, the cylinder 700 is reset, driving the telescopic barrel 500 to rotate in the opposite direction, thereby resetting the auxiliary nozzle 300 to the initial state in the opposite direction; continue drying; the telescopic characteristics of the bellows telescopic tube 600 can ensure that the material will not leak when the telescopic barrel 500 moves up and down; finally, the dried solid particles are discharged together with the gas flow, and the dried material is sucked out through the suction device and guided to the collection device 104 for collection.

[0082] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0083] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A potassium fluoride multi-stage drying device, characterized in that: It comprises a housing (100), a telescopic barrel (500), an air intake assembly and a drive connection structure; An upper drying chamber with an opening facing downward is formed inside the shell (100), and a feed assembly is provided on the top of the shell (100); The telescopic barrel (500) is arranged in the shell (100) and can move relative to the shell (100); a drying lower chamber with an upward opening is formed in the telescopic barrel (500); the drying lower chamber cooperates with the drying upper chamber to form a drying chamber; and during the movement of the telescopic barrel (500) relative to the shell (100), the opening of the drying lower chamber can scrape off materials on the inner wall of the drying upper chamber; The air intake assembly is used to dry the material in the drying chamber and purge the inner wall of the drying chamber; The driving connection structure connects the telescopic barrel (500) and the air intake assembly, and is used to control the blowing angle of the air intake assembly as the telescopic barrel (500) moves to blow the inner wall of the drying chamber; The air intake assembly comprises: a hot air inlet (105) arranged around the circumference of the feed assembly, and an auxiliary nozzle (300) arranged around the inner circumferential wall of the upper drying chamber; An annular inner cavity is formed on the top of the shell (100) and is opened around the feed assembly, and the hot air inlet (105) is opened on one side of the annular inner cavity corresponding to the feed assembly; The air intake assembly also includes a hot air blower (102) and an air intake duct; The air intake duct is connected between the outlet of the hot air blower (102) and the annular inner cavity; The auxiliary nozzle (300) is rotatably arranged on the inner peripheral wall of the drying upper chamber, and the air intake assembly further comprises an auxiliary air intake pipe (107) for balanced distribution of the gas delivered to the auxiliary nozzle (300); The air outlet end of the auxiliary air inlet pipe (107) is connected to the auxiliary nozzle (300) via a first pipe, and the air inlet end of the auxiliary air inlet pipe (107) is connected to the annular inner cavity via a second pipe; The feed assembly comprises a feed port (101) and a nozzle (106); The feed port (101) is used to convey materials, wherein the inner diameter of the tube of the feed port (101) gradually decreases along the direction from the first end to the second end of the feed port (101); The spray head (106) is arranged at the second end of the feed port (101) and is used for spraying the material; The telescopic barrel (500) is formed with an inner barrel wall and an outer barrel wall; Wherein, a matching groove (504) is formed between the inner barrel wall and the outer barrel wall, the matching groove (504) is used to be embedded in the cavity wall plate of the drying upper chamber, and a thread (503) is provided on the inner side of the outer barrel wall, and the thread (503) matches with a thread groove (111) on the outer side of the cavity wall plate of the drying upper chamber, so that when the telescopic barrel (500) moves relative to the shell (100), the telescopic barrel (500) can rotate synchronously around its axis; The driving connection structure comprises a lower telescopic rod (501), an upper telescopic rod (201) and a gear ring (800); The lower telescopic rod (501) is arranged on the outside of the telescopic barrel (500); One end of the upper telescopic rod (201) is slidably disposed on the housing (100), and the other end is slidably connected to the lower telescopic rod (501); The gear ring (800) is sleeved on the outer peripheral side of the drying upper chamber and connected to the upper telescopic rod (201), wherein the matching teeth of the gear ring (800) mesh with the bevel gear (301) of the auxiliary nozzle (300) in the air intake assembly; When the telescopic barrel (500) drives the lower telescopic rod (501) to move, the lower telescopic rod (501) can drive the upper telescopic rod (201) and the gear ring (800) to rotate around the outer circumference of the upper drying chamber to adjust the jetting angle of the auxiliary nozzle (300); The drying device also includes a cylinder (700) and a corrugated telescopic tube (600); The cylinder (700) is connected to the telescopic barrel (500) via a lifting plate, and is used to drive the telescopic barrel (500) to move; One end of the bellows telescopic tube (600) is connected to the barrel bottom of the telescopic barrel (500), and the other end is connected to the collecting device (104).

2. A multi-stage drying method for potassium fluoride, characterized in that: The drying method uses the drying device according to claim 1 for drying; the method comprises: Starting the hot air blower (102) to supply air to the drying chamber to dry the material, including: controlling the air supply amount and the material feed amount, and sequentially performing four processes of rapid drying, constant speed drying, speed reduction drying and temperature increase drying on the material; During the drying process, controlling the telescopic barrel (500) to move relative to the housing (100); After drying, the dried material is collected.

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