Superfine boron carbide powder spray drying equipment

Abstract

The invention relates to the technical field of drying machines, in particular to superfine boron carbide powder spray drying equipment which comprises a drying bin, an air inlet heating unit, a cyclone separation unit, a condensing tower and a storage unit, a feeding atomization unit is arranged in the drying bin, a rotating unit is further arranged in the drying bin, and the cyclone separation unit and the condensing tower are arranged in the drying bin. A pressure sensor is further arranged in the spraying head, an expansion piece is arranged at the lower end of the fixing disc, an ejector pin matched with the pressing ring is arranged at the upper end of the spraying head, and the feeding atomization unit, the spraying head, the connecting unit and the rotating unit are arranged, so that the blocking condition of the spraying head can be judged through assistance of the pressure sensor; according to the spray drying device, blockage can be removed passively or actively according to the blockage condition, in the active blockage removing process, the temperature of the lower area of the drying bin can be accurately adjusted by adjusting the extending distance of the expansion piece, and the better spray drying effect is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of dryers, and particularly to a spray drying device for ultrafine boron carbide powder. Background Art

[0002] A spray dryer is a device that can simultaneously complete drying and granulation. According to process requirements, the pressure, flow rate of the feed liquid pump, and the size of the spray holes can be adjusted to obtain spherical particles with a required size ratio. Among them, boron carbide powder can be produced using a spray dryer.

[0003] A novel air - flow spray dryer with Chinese Patent Application No. CN202410479230.4 includes a housing. A hot - air distribution mechanism is arranged at the top of the housing. A spray gun is arranged in the housing. The opening of the spray gun faces upward and is located on the axis of the housing. The spray gun is located below the hot - air distribution mechanism. A fluidized bed is arranged at the bottom of the housing. An air - supply mechanism is arranged below the fluidized bed, and a discharging mechanism is arranged above the fluidized bed.

[0004] During the spray drying process of boron carbide powder, when using the above - mentioned equipment for spray drying, the spray holes of the distribution plate are inevitably blocked. Conventional methods often directly replace it, which easily affects the processing efficiency. Moreover, when the hot air in the housing flows in a spiral state from top to bottom, it is easy to cause the internal temperature of the housing to decrease from top to bottom. Once one or more spray holes of the distribution plate are blocked, the flow rate and velocity of the other spray holes will increase, and the sprayed atomized raw materials are difficult to dry thoroughly when entering the lower part of the housing, thus affecting the spray drying effect of boron carbide powder. Summary of the Invention

[0005] To solve the above - mentioned technical problems, the present invention provides a spray drying device for ultrafine boron carbide powder.

[0006] The present invention includes a drying chamber, an air - intake heating unit, a cyclone separation unit, a condensation tower, and a storage unit. A feed atomization unit is arranged in the drying chamber, and a rotating unit is also arranged in the drying chamber;

[0007] The feed atomization unit includes a feed pipe. A spray head is rotatably arranged at the end of the feed pipe. A fixed disk is arranged on the feed pipe above the spray head. A pressure ring is sleeved between the spray head and the fixed disk on the feed pipe. A first spring is arranged between the pressure ring and the fixed disk. A push rod is slidably arranged at the lower end of the fixed disk and is connected to the pressure ring. A thimble cooperating with the pressure ring is arranged at the upper end of the spray head. A pressure sensor is also arranged in the spray head. A telescopic device is arranged at the lower end of the fixed disk;

[0008] The rotation unit includes an extension plate. A rotating member is rotatably arranged at the side end of the extension plate through a torsion spring. An adjusting fan blade is arranged at the side end of the rotating member. A connecting unit is arranged between the adjusting fan blade and the spray head.

[0009] By providing a feeding and atomizing unit, a spray head, a connecting unit and a rotation unit, with the assistance of a pressure sensor, the clogging condition of the spray head can be judged, and passive or active clogging removal can be carried out according to the clogging condition. And during the active clogging removal process, the temperature of the lower area of the drying chamber can be accurately adjusted by adjusting the extending distance of the telescopic device, so as to achieve a better spray drying effect.

[0010] Preferably, the rotation unit further includes a rotating ring. An installation groove for the rotating ring is arranged on the inner wall of the drying chamber, and the rotating ring is rotationally matched with the drying chamber. The extension plate is arranged at the lower end of the rotating ring.

[0011] Preferably, an internal gear is arranged inside the rotating ring. A control motor is arranged at the upper end of the drying chamber. The output end of the control motor rotates through the drying chamber, and a mating gear meshing with the internal gear is arranged inside the drying chamber at the output end of the control motor.

[0012] Preferably, a channel is arranged inside the fixed disk. The cross-section of the channel is L-shaped. The top of the push rod slides in the channel in the form of a piston. The channel is communicated with the feed pipe. An auxiliary block is also slidably arranged in the channel. The auxiliary block is arranged at the connection between the channel and the feed pipe. Anti-disengagement rings are arranged at both outlet ends of the channel.

[0013] Preferably, the connecting unit includes an installation cylinder. An output rod is slidably arranged on the installation cylinder. A limit disk is arranged outside the installation cylinder on the output rod. A deceleration disk is arranged inside the installation cylinder on the output rod. There is friction between the deceleration disk and the inner wall of the installation cylinder.

[0014] Preferably, the installation cylinder is arranged at the upper end of the spray head. A connecting plate is arranged on one side of the adjusting fan blade close to the spray head. There are two limit disks, and the two limit disks are respectively located on both sides of the connecting plate.

[0015] Preferably, the first spring is located outside the telescopic device. The telescopic device is located outside the feed pipe. The output end of the telescopic device does not contact the pressing ring. The telescopic device is specifically an annular electric cylinder.

[0016] Preferably, a spray orifice is arranged at the lower end of the spray head. The position of the spray orifice matches that of the ejector pin. The ejector pin is slidably and sealingly matched with the spray head. A limit plate is arranged at the upper end of the ejector pin. A second spring is arranged between the limit plate and the spray head.

[0017] Preferably, the fixed disk is arranged at the middle of the top of the drying chamber. A transition bump is arranged at the lower end of the pressing ring. The position of the transition bump matches the positions of the ejector pin and the connecting unit. The surface of the transition bump is made of wear-resistant and smooth material.

[0018] The present invention also provides a method for unclogging an ultrafine boron carbide powder spray drying device, including the following steps:

[0019] Step 1: Establish a curve graph of pressure varying with time according to the pressure detection value of the pressure sensor, analyze and judge the curve graph of pressure-time, and determine the clogging condition of the spray head according to the analysis result of the curve graph of pressure-time;

[0020] Step 2: When the clogging of the spray head is the first case, the feeding and atomizing unit, the rotating unit, the connecting unit and the spray head cooperate to perform passive unclogging;

[0021] When the clogging condition of the spray head is the first case, the feeding and atomizing unit, the rotating unit, the connecting unit and the spray head cooperate to perform active unclogging;

[0022] Step 3: When performing active unclogging in Step 2, the detection value of the pressure sensor is associated with the extending distance of the telescopic device, that is, the detection value of the pressure sensor is associated with the deflection angle of the adjusting fan blade, so as to realize precise adjustment of the temperature in the lower area of the drying chamber;

[0023] Step 4: When performing unclogging in Step 2, by analyzing the spraying range of the spray head, a cleaning brush is correspondingly arranged in the direction of the extension plate close to the inner wall of the drying chamber. As the extension plate rotates, the cleaning brush can clean the boron carbide powder adhered to the inner wall of the drying chamber;

[0024] Step 5: When performing passive unclogging in Step 2, by utilizing the characteristics of the connecting unit, the pressure in the feeding pipe forms a pulsed change, so as to realize the flushing and cleaning of the impurities clogged in the spray port.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] 1. By setting a pressure sensor, when the spray port is clogged and the pumping pressure remains unchanged, the clogging condition of the spray port can be indirectly judged through the detection of the pressure sensor, which is divided into two cases. The pressure value curve corresponding to the first case fluctuates greatly, while the change of the pressure value curve corresponding to the second case tends to rise smoothly.

[0027] 2. By setting up a pressure sensor, a feed atomization unit, and a spray head, the clogging situation of the spray opening is indirectly judged according to the pressure sensor. When it is the first case, the pressure ring is lowered by the assistance of the pressure in the feed pipe for passive clogging removal. When it is the second case, by setting a pressure threshold, the pressure ring is controlled to lower through the telescopic device for active clogging removal, achieving a better spray drying effect in the drying chamber.

[0028] 3. By setting up a pressure sensor, a feed atomization unit, and a spray head, during active clogging removal, the detected value of the pressure sensor is associated with the extended distance of the telescopic device, that is, the detected value of the pressure sensor is associated with the deflection angle of the adjusting fan blade, achieving precise adjustment of the temperature in the lower area of the drying chamber and ensuring the spray drying effect in the drying chamber.

[0029] 4. By setting up a rotating unit, by analyzing the spray range of the spray head, a cleaning brush is correspondingly arranged in the direction where the extension plate is close to the inner wall of the drying chamber. As the extension plate rotates, the cleaning brush can clean the boron carbide powder adhered to the inner wall of the drying chamber, improving the spray drying effect of the boron carbide powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic structural diagram of the present invention;

[0031] Figure 2 is a schematic structural diagram of another perspective of the present invention;

[0032] Figure 3 is the present invention Figure 2 schematic internal structure diagram of the drying chamber;

[0033] Figure 4 is the Figure 3 enlarged structural diagram of part A in the present invention;

[0034] Figure 5 is the schematic internal structure diagram of the drying chamber of the present invention;

[0035] Figure 6 is the schematic structural diagram of the feed atomization unit of the present invention;

[0036] Figure 7 is the schematic internal structure diagram of the feed atomization unit;

[0037] Figure 8 is the Figure 7 enlarged structural diagram of part B in the present invention;

[0038] Figure 9 is the schematic structural diagram of the rotating unit of the present invention;

[0039] Figure 10 is the schematic structural diagram of the connection unit of the present invention.

[0040] Reference numerals: 1, drying bin; 2, intake air heating unit; 3, cyclone separation unit; 4, condensation tower; 5, storage unit; 6, feed atomization unit; 7, rotating unit; 8, spray head; 9, transition bump; 10, connection unit; 601, feed pipe; 602, fixed disk; 603, pressing ring; 604, push rod; 605, first spring; 606, expander; 607, channel; 608, auxiliary block; 701, rotating ring; 702, extension plate; 703, rotating member; 704, adjusting fan blade; 705, internal gear; 706, control motor; 707, mating gear; 801, ejector pin; 802, spray orifice; 803, limiting plate; 804, second spring; 1001, mounting cylinder; 1002, limiting disk; 1003, connecting plate; 1004, output rod; 1005, reduction disk. Detailed implementation manners

[0041] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0042] Embodiment 1

[0043] This embodiment provides an ultrafine boron carbide powder spray drying device, as Figures 1 to 10 shown, including a drying bin 1, an intake air heating unit 2, a cyclone separation unit 3, a condensation tower 4, and a storage unit 5. A feed atomization unit 6 is arranged in the drying bin 1, and a rotating unit 7 is also arranged in the drying bin 1. During the process of spray drying the boron carbide powder, the production raw materials of the boron carbide powder are proportioned and then mixed by a ball mill to form a slurry, and then the slurry is sprayed into the drying bin 1 with the assistance of the feed atomization unit 6. The intake air heating unit 2 will inhale, filter, and heat the outside air, and the heated air is sent into the drying bin 1 from the top in a spiral shape. The hot air sent into the drying bin 1 will be fully mixed with the slurry sprayed out by the feed atomization unit 6 in a mist shape, and through the assistance of the rotating unit 7, it is ensured that the gas in the drying bin 1 is in a flowing state, enhancing the mixing and heating effect, enabling the slurry to be quickly dried to form boron carbide powder and fall. The falling boron carbide powder will enter the storage unit 5, and the slurry in a mist shape that is not fully dried will enter the cyclone separation unit 3 through a pipeline. With the assistance of the cyclone separator in the cyclone separation unit 3, the remaining boron carbide powder can be separated and processed and fall into the storage unit 5. The gas after separation enters the subsequent condensation tower 4 for post-treatment, wherein the fineness of the ultrafine boron carbide powder is from 1 micron to 3.5 microns.

[0044] The feed atomization unit 6 includes a feed pipe 601. A spray head 8 is rotatably arranged at the end of the feed pipe 601. A spray port 802 is arranged at the lower end of the spray head 8. The slurry in the feed pipe 601 is conveyed to the spray head 8 by means of pumping, and the spray head 8 sprays the slurry downward in a mist form with the assistance of the spray port 802.

[0045] A fixed disk 602 is arranged above the spray head 8 on the feed pipe 601. The fixed disk 602 is arranged at the middle of the top of the drying chamber 1. A conical groove matching the fixed disk 602 is arranged at the middle of the top of the drying chamber 1. The fixed disk 602 is located in the conical groove for limiting and installation, and it is ensured that the drying chamber 1 remains airtight.

[0046] As Figures 3 to 5 shown, the rotating unit 7 includes an extension plate 702 and a rotating ring 701. An installation groove for the rotating ring 701 is arranged on the inner wall of the drying chamber 1, and the rotating ring 701 is rotationally matched with the drying chamber 1. The extension plate 702 is arranged at the lower end of the rotating ring 701. The rotation of the rotating ring 701 can drive the rotation of the extension plate 702. During the rotation of the extension plate 702, the air in the drying chamber 1 will flow, and the hot air entering the drying chamber 1 is in a spiral state. With the assistance of the extension plate 702, the hot air entering the bottom of the drying chamber 1 can also remain in a spiral state, thereby enhancing the heating and drying effect inside the drying chamber 1.

[0047] As Figure 9 shown, an internal gear 705 is arranged inside the rotating ring 701. A control motor 706 is arranged at the upper end of the drying chamber 1. The output end of the control motor 706 rotates through the drying chamber 1, and a mating gear 707 meshing with the internal gear 705 is arranged inside the drying chamber 1 at the output end of the control motor 706. When the control motor 706 operates, the mating gear 707 will rotate. Through the meshing of the mating gear 707 with the internal gear 705, the rotating ring 701 rotates. By controlling the control motor 706, the rotation speed of the rotating ring 701 is controlled to improve the stability of the equipment operation.

[0048] During the spray drying process of boron carbide powder, the hot air in the drying chamber 1 flows in a spiral state from top to bottom. When the volume of the drying chamber 1 is relatively large, it is easy to cause the internal temperature of the drying chamber 1 to decrease from top to bottom. When the spray head 8 sprays, the spray orifice 802 of the spray head 8 will be blocked during long-term use. When the spray orifice 802 of the spray head 8 is blocked, without changing the pumping pressure, the pressure inside the spray head 8 will increase, thereby changing the spraying effect of other spray orifices 802, that is, the spraying speed of the spray orifice 802 will increase, and more mist-like slurry will enter the lower area of the drying chamber 1. The internal temperature distribution of the drying chamber 1 and the change in the spraying effect of the spray orifice 802 will affect the spray drying effect of the boron carbide powder in the drying chamber 1, easily causing the spray drying effect in the drying chamber 1 to decline, resulting in an increased burden on the subsequent cyclone separation unit 3 and being unfavorable for the long-term stable operation of the equipment.

[0049] As Figures 4 to 10 shown, a pressure ring 603 is sleeved on the feed pipe 601 between the spray head 8 and the fixed disk 602, and a first spring 605 is arranged between the pressure ring 603 and the fixed disk 602. A thimble 801 cooperating with the pressure ring 603 is arranged at the upper end of the spray head 8. The position of the spray orifice 802 matches that of the thimble 801. The thimble 801 is in sliding seal cooperation with the spray head 8. When the pressure ring 603 moves up and down, the pressure ring 603 will press down the thimble 801, causing the thimble 801 to descend into the spray orifice 802, thereby achieving the effect of dredging the spray orifice 802.

[0050] A limiting plate 803 is arranged at the upper end of the thimble 801, and a second spring 804 is arranged between the limiting plate 803 and the spray head 8. When no pressure is applied to the upper end of the thimble 801, with the assistance of the second spring 804, the thimble 801 can restore its position.

[0051] A push rod 604 is slidably arranged at the lower end of the fixed disk 602 and is connected to the pressure ring 603. A channel 607 is arranged inside the fixed disk 602. The cross-section of the channel 607 is L-shaped. The top of the push rod 604 slides in the channel 607 in the form of a piston. The channel 607 is communicated with the feed pipe 601. An auxiliary block 608 is also slidably arranged in the channel 607. The auxiliary block 608 is arranged at the connection of the channel 607 and the feed pipe 601. Anti-disengagement rings are arranged at both outlet ends of the channel 607. When the spray orifice 802 is blocked, the pressure in the feed pipe 601 will also increase accordingly. As the pressure in the feed pipe 601 increases, the pressure will act on the auxiliary block 608, causing the auxiliary block 608 to move in the channel 607. Thus, under the combined action of the pressure in the channel 607, the push rod 604 can move, and further the pressure ring 603 can move up and down, that is, indirectly control the up and down movement of the pressure ring 603 through the change in the pressure in the feed pipe 601.

[0052] A telescopic device 606 is provided at the lower end of the fixed disk 602. The first spring 605 is located outside the telescopic device 606. The telescopic device 606 is located outside the feed pipe 601. The output end of the telescopic device 606 does not contact the pressure ring 603. The telescopic device 606 is specifically an annular electric cylinder. When the telescopic device 606 operates, when its output end continuously moves downward, it will push the pressure ring 603 downward, thereby realizing the active control of the lifting of the pressure ring 603.

[0053] A pressure sensor is also provided in the spray head 8. The pressure inside the spray head 8 can be detected through the pressure sensor. In the case where the spray orifice 802 is blocked and the pumping pressure remains unchanged, when different numbers of spray orifices 802 are blocked, the corresponding pressure inside the spray head 8 is different. Therefore, the number of blocked spray orifices 802 can also be indirectly judged through the assistance of the pressure sensor.

[0054] A rotating member 703 is rotatably provided at the side end of the extension plate 702 through a torsion spring. An adjusting fan blade 704 is provided at the side end of the rotating member 703. A connecting unit 10 is provided between the adjusting fan blade 704 and the spray head 8. When the extension plate 702 rotates with the rotating ring 701, the rotation of the spray head 8 can be driven through the assistance of the rotating member 703, the adjusting fan blade 704 and the connecting unit 10, making the spraying of the spray head 8 more uniform and the spraying range larger.

[0055] Such as Figure 6 And Figure 10As shown, the connecting unit 10 includes an installation cylinder 1001. A output rod 1004 is slidably arranged on the installation cylinder 1001. A limit disk 1002 is arranged outside the installation cylinder 1001 on the output rod 1004. A reduction disk 1005 is arranged inside the installation cylinder 1001 on the output rod 1004. There is frictional force between the reduction disk 1005 and the inner wall of the installation cylinder 1001. The installation cylinder 1001 is arranged at the upper end of the spray head 8. A connecting plate 1003 is arranged on one side of the adjusting fan blade 704 close to the spray head 8. There are two limit disks 1002, and the two limit disks 1002 are respectively located on both sides of the connecting plate 1003. When the upper end of the limit disk 1002 is subjected to the pressure of the pressure ring 603, the output rod 1004 will move downward. And there is liquid in the installation cylinder 1001. When the output rod 1004 moves downward, there is a gap between the reduction disk 1005 and the installation cylinder 1001. The liquid at the lower end of the reduction disk 1005 will enter the upper end of the reduction disk 1005 through the gap. In this way, resistance exists for the downward movement of the output rod 1004, so that the downward movement of the output rod 1004 is slow. And when the output rod 1004 moves downward, through the cooperation of the two limit disks 1002 and the connecting plate 1003, the angle of the adjusting fan blade 704 deflects. When the pressure of the pressure ring 603 on the limit disk 1002 disappears, with the assistance of the torsion spring, the adjusting fan blade 704 will rotate back. And due to the cooperation of the reduction disk 1005 and the installation cylinder 1001, the upward movement of the output rod 1004 is slow, that is, the rotation of the adjusting fan blade 704 is slow.

[0056] A transition convex block 9 is arranged at the lower end of the pressure ring 603. The position of the transition convex block 9 matches the positions of the thimble 801 and the connecting unit 10. The surface of the transition convex block 9 is made of wear-resistant and smooth material, making the cooperation between the pressure ring 603 and the thimble 801 and the connecting unit 10 more smooth.

[0057] During the use of the equipment, when the feed pipe 601 conveys the slurry to the spray head 8 in a pumping manner, the spray orifice 802 in the spray head 8 sprays the slurry downward in a mist shape. And with the assistance of the intake air heating unit 2, the inside of the drying chamber 1 has been preheated. While the spray orifice 802 is spraying, the control motor 706 will start, making the rotating ring 701 rotate, and then making the extension plate 702 rotate. The rotation of the extension plate 702 can ensure that the hot air in the drying chamber 1 can maintain a state of rotating downward, making the hot air fully contact with the mist droplets, achieving the effect of rapid drying.

[0058] During the rotation of the extension plate 702, the rotation of the spray head 8 can be driven by the assistance of the rotating member 703, the adjusting fan blade 704 and the connecting unit 10. During the rotation of the spray head 8, the downward spraying of the spray port 802 can be made more uniform, and the mist droplets ejected from the spray port 802 will diverge towards the inner wall of the drying chamber 1 due to the action of centrifugal force, increasing the spraying area and the contact area between the ejected mist droplets and the hot air to enhance the drying effect.

[0059] During the spray drying of boron carbide powder, it is inevitable that the spray port 802 at the lower end of the spray head 8 will become blocked. There are two types of blockages in the spray port 802. One is the blockage caused by one or more spray ports 802 being unable to pass large particle impurities in the slurry, and the other is the blockage caused by the rapid drying and condensation of the slurry at the spray port 802 during spraying, which is similar to the formation of scale in a faucet. When the corresponding spray port 802 is blocked, when the pumping pressure remains unchanged, the pressure value detected by the pressure sensor in the spray head 8 will also change. The pressure value curve corresponding to the first case fluctuates greatly, while the pressure value curve corresponding to the second case changes smoothly and rises. Therefore, the blockage situation of the spray port 802 can be indirectly judged through the detection of the pressure sensor. And in the case of blockage of the spray port 802 in the first type, when the pumping pressure remains unchanged, when different numbers of spray ports 802 are blocked, the pressure inside the corresponding spray head 8 is different. Therefore, the number of blocked spray ports 802 can also be indirectly judged through the assistance of the pressure sensor.

[0060] When the blockage situation of the spray port 802 is detected as the first type through the assistance of the pressure sensor, the device will start the passive blockage clearing method. That is, due to the blockage of the spray port 802, the pressure in the feed pipe 601 will rise. In this case, the blockage of the spray port 802 usually has a large blockage area. Therefore, the pressure in the feed pipe 601 will act on the auxiliary block 608, causing the auxiliary block 608 to move in the channel 607. Thus, under the combined action of the pressure in the channel 607, the push rod 604 can move downward. The downward movement of the push rod 604 will cause the pressure ring 603 to move downward. In this case, the downward movement of the pressure ring 603 will cause the transition convex block 9 to move downward. Since the spray head 8 is in a rotating state, as the spray head 8 rotates, the transition convex block 9 will contact the limit plate 803, and then the thimble 801 will move downward and insert into the spray port 802 to clear the blockage of the spray port 802. Since the cooperation between the transition convex block 9 and multiple limit plates 803 is carried out one by one, the other unblocked spray ports 802 will remain in normal working condition until the blocked spray port 802 is unclogged. Then the pressure in the spray head 8 will drop, so that the pressure acting on the auxiliary block 608 will drop. Under the action of the first spring 605, the pressure ring 603 will rise, and the thimble 801 will rise under the action of the second spring 804 to restore the normal operating state of the spray head 8 and achieve a better spraying effect.

[0061] When the blockage situation of the spray port 802 detected by the auxiliary of the pressure sensor is the first type, that is, when the detected value of the pressure sensor rises smoothly to the set threshold, the device starts active blockage cleaning. The telescopic device 606 will start, and the output end of the telescopic device 606 will move downward by a set distance and push the pressure ring 603 downward, so that the transition bump 9 at the lower end of the pressure ring 603 cooperates with the limit plate 803, and the thimble 801 clears the blockage of the spray port 802. During this process, the output end of the telescopic device 606 will extend by a set distance and maintain for a set time before retracting, ensuring that each spray port 802 is cleared of blockage and achieving a better spraying effect.

[0062] In both blockage situations, due to the increase in the pressure inside the spray head 8, the spraying flow rate and flow of the spray port 802 will increase. And because the temperature distribution in the drying chamber 1 decreases from top to bottom, when the spraying flow rate and flow increase, more boron carbide slurry will enter the cyclone separation unit 3 without having time to dry. In both blockage cleaning methods, when the pressure ring 603 moves downward, the transition bump 9 will contact the limit disc 1002 and make the limit disc 1002 move downward. At this time, the output rod 1004 will move downward. There is liquid in the mounting cylinder 1001. When the output rod 1004 moves downward, there is a gap between the speed reduction disc 1005 and the mounting cylinder 1001, and the liquid at the lower end of the speed reduction disc 1005 will enter the upper end of the speed reduction disc 1005 through the gap. In this way, there is resistance to the downward movement of the output rod 1004, so that the downward movement of the output rod 1004 is slow. When the output rod 1004 moves downward, through the cooperation of the two limit discs 1002 and the connecting plate 1003, the angle of the adjusting fan blade 704 is deflected. As the adjusting fan blade 704 rotates, a downward wind force will be generated, accelerating the flow rate of the hot air from top to bottom, so that the temperature in the lower area of the drying chamber 1 will gradually increase, improving the drying effect in the lower area of the drying chamber 1 and reducing the boron carbide droplets that have not had time to dry from entering the cyclone separation unit 3.

[0063] The difference in the means of adjusting the temperature in the lower area of the drying chamber 1 between the two blockage cleaning methods is that during active blockage cleaning, the detected value of the pressure sensor is related to the extended distance of the telescopic device 606. That is, under the cooperation of the pressure ring 603 and the connecting unit 10, the detected value of the pressure sensor is related to the deflection angle of the adjusting fan blade 704, realizing precise adjustment of the temperature in the lower area of the drying chamber 1, while passive blockage cleaning cannot be precisely controlled, and the corresponding blockage situation of passive blockage cleaning occurs in the short term and does not require precise adjustment of the temperature in the lower area of the drying chamber 1.

[0064] During the spray drying process in the drying chamber 1, there is also a problem that boron carbide powder adheres to the inner wall of the drying chamber 1. The occurrence position is near the lower end of the spray head 8. Therefore, by analyzing the spray range of the spray head 8, a cleaning brush is correspondingly arranged in the direction of the extension plate 702 close to the inner wall of the drying chamber 1. As the extension plate 702 rotates, the cleaning brush can clean the boron carbide powder adhering to the inner wall of the drying chamber 1, improving the spray drying effect of the boron carbide powder.

[0065] In the passive cleaning method, due to the characteristics of the connecting unit 10, when the transition bump 9 contacts the connecting unit 10, due to the reciprocity of forces, the pressure ring 603 will vibrate upward. Then, under the action of the push rod 604 and the auxiliary block 608, the pressure in the feed pipe 601 forms a pulsed change, which is beneficial to flushing and cleaning the blocked impurities in the spray port 802, improving the clogging removal effect.

[0066] The main functions achieved by the present invention are as follows: By setting the feed atomization unit 6, the spray head 8, the connecting unit 10, and the rotating unit 7, with the assistance of the pressure sensor, the clogging condition of the spray head 8 can be judged, and passive or active clogging removal can be performed according to the clogging condition. And during the active clogging removal process, the temperature in the lower area of the drying chamber 1 can be accurately adjusted by adjusting the extension distance of the telescopic device 606, achieving a better spray drying effect.

[0067] Embodiment 2

[0068] This embodiment also provides a clogging removal method for an ultra-fine boron carbide powder spray drying device, including the following steps:

[0069] Step 1: Establish a curve graph of pressure changing with time based on the pressure detection value of the pressure sensor, analyze and judge the curve graph of pressure and time, and determine the clogging condition of the spray head 8 according to the analysis result of the curve graph of pressure and time;

[0070] Step 2: When the clogging of the spray head 8 is the first situation, that is, blocked by large particle impurities, the feed atomization unit 6, the rotating unit 7, the connecting unit 10, and the spray head 8 cooperate for passive clogging removal;

[0071] When the clogging condition of the spray head 8 is the second situation, that is, blocked by adhesion during long-term use, the feed atomization unit 6, the rotating unit 7, the connecting unit 10, and the spray head 8 cooperate for active clogging removal;

[0072] Step 3: During the active clogging removal in Step 2, the detection value of the pressure sensor is associated with the extension distance of the telescopic device 606, that is, the detection value of the pressure sensor is associated with the deflection angle of the adjusting fan blade 704, so as to achieve precise adjustment of the temperature in the lower area of the drying chamber 1;

[0073] Step 4: When unclogging in Step 2, by analyzing the spraying range of the spray head 8, a cleaning brush is correspondingly arranged in the direction of the extension plate 702 close to the inner wall of the drying chamber 1. As the extension plate 702 rotates, the cleaning brush can clean the boron carbide powder adhered to the inner wall of the drying chamber 1;

[0074] Step 5: When performing passive unclogging in Step 2, by utilizing the characteristics of the connection unit 10, the pressure in the feed pipe 601 is made to change in a pulse manner to flush and clean the clogged impurities in the spray port 802.

[0075] For the ultrafine boron carbide powder spray drying equipment of the present invention, its installation method, connection method or setting method are all common mechanical methods, and any implementation that can achieve its beneficial effects can be carried out.

[0076] All the technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0077] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the technical field, without departing from the technical principle of the present invention, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An ultrafine boron carbide powder spray drying device, comprising a drying chamber (1), an air intake heating unit (2), a cyclone separation unit (3), a condensation tower (4) and a storage unit (5), characterized in that: A feed atomization unit (6) is provided in the drying chamber (1), and a rotating unit (7) is also provided in the drying chamber (1); The feed atomization unit (6) comprises a feed pipe (601), a spray head (8) is rotatably provided at the end of the feed pipe (601), a fixed disk (602) is provided on the feed pipe (601) above the spray head (8), and a pressure ring (603) is sleeved on the feed pipe (601) between the spray head (8) and the fixed disk (602); The rotating unit (7) comprises an extension plate (702), a rotating member (703) is arranged at the side end of the extension plate (702) for rotation via a torsion spring, and an adjusting blade (704) is arranged at the side end of the rotating member (703).

2. The ultrafine boron carbide powder spray drying equipment according to claim 1, characterized in that: The rotating unit (7) further comprises a rotating ring (701), the inner wall of the drying bin (1) is provided with a mounting groove for the rotating ring (701), and the rotating ring (701) is rotatably matched with the drying bin (1), and the extension plate (702) is arranged at the lower end of the rotating ring (701).

3. The ultrafine boron carbide powder spray drying equipment according to claim 2, characterized in that: An internal gear (705) is arranged on the inner side of the rotating ring (701), a control motor (706) is arranged on the upper end of the drying chamber (1), an output end of the control motor (706) rotates through the drying chamber (1), and a matching gear (707) meshing with the internal gear (705) is arranged on the output end of the control motor (706) inside the drying chamber (1).

4. The ultrafine boron carbide powder spray drying equipment according to claim 1, characterized in that: A first spring (605) is arranged between the pressure ring (603) and the fixed disk (602); a push rod (604) is slidably arranged at the lower end of the fixed disk (602) and connected to the pressure ring (603); a push pin (801) cooperating with the pressure ring (603) is arranged at the upper end of the spray head (8); a pressure sensor is also arranged in the spray head (8); a retractor (606) is arranged at the lower end of the fixed disk (602); and a The channel (607) has an L-shaped cross section, the top of the push rod (604) slides in the channel (607) in the form of a piston, the channel (607) is connected to the feed pipe (601), an auxiliary block (608) is also slidably arranged in the channel (607), and the auxiliary block (608) is arranged at the connection between the channel (607) and the feed pipe (601), and anti-slip rings are arranged at the outlets on both sides of the channel (607).

5. The ultrafine boron carbide powder spray drying equipment according to claim 1, characterized in that: A connection unit (10) is provided between the regulating blade (704) and the spray head (8), and the connection unit (10) comprises a mounting cylinder (1001), an output rod (1004) is slidably provided on the mounting cylinder (1001), a limiting disk (1002) is provided on the output rod (1004) outside the mounting cylinder (1001), a deceleration disk (1005) is provided on the output rod (1004) inside the mounting cylinder (1001), and friction exists between the deceleration disk (1005) and the inner wall of the mounting cylinder (1001).

6. The ultrafine boron carbide powder spray drying equipment according to claim 5, characterized in that: The mounting cylinder (1001) is arranged at the upper end of the spray head (8), a connecting plate (1003) is arranged on the side of the regulating blade (704) close to the spray head (8), two limiting plates (1002) are arranged, and the two limiting plates (1002) are respectively located on both sides of the connecting plate (1003).

7. The ultrafine boron carbide powder spray drying equipment according to claim 4, characterized in that: The first spring (605) is located outside the telescope (606), the telescope (606) is located outside the feed pipe (601), the output end of the telescope (606) is not in contact with the pressure ring (603), and the telescope (606) is specifically an annular electric cylinder.

8. The ultrafine boron carbide powder spray drying equipment according to claim 1, characterized in that: A spray port (802) is provided at the lower end of the spray head (8), the position of the spray port (802) matches the ejector pin (801), the ejector pin (801) and the spray head (8) are slidably sealed, a limit plate (803) is provided at the upper end of the ejector pin (801), and a second spring (804) is provided between the limit plate (803) and the spray head (8).

9. The ultrafine boron carbide powder spray drying equipment according to claim 1, characterized in that: The fixed plate (602) is arranged in the middle of the top of the drying chamber (1), and a transition protrusion (9) is arranged at the lower end of the pressure ring (603). The position of the transition protrusion (9) matches the position of the ejector pin (801) and the connecting unit (10), and the surface of the transition protrusion (9) is made of wear-resistant and smooth material.

10. A method for clearing blockage of ultrafine boron carbide powder spray drying equipment according to claim 1, characterized in that: The steps include: Step 1: establishing a curve graph of pressure change over time according to the pressure detection value of the pressure sensor, analyzing and judging the pressure-time curve graph, and judging the blockage condition of the spray head (8) according to the analysis result of the pressure-time curve graph; Step 2: When the spray head (8) is blocked by the first case, i.e., blocked by large particles of impurities, the feed atomization unit (6), the rotating unit (7), the connecting unit (10) and the spray head (8) cooperate to perform passive blockage clearing; When the blockage condition of the spray head (8) is the second condition, i.e., long-term use and adhesion blockage, the feed atomization unit (6), the rotating unit (7), the connecting unit (10) and the spray head (8) cooperate to actively clear the blockage; Step 3: When actively clearing the blockage in step 2, the detection value of the pressure sensor is associated with the extension distance of the telescopic device (606), that is, the detection value of the pressure sensor is associated with the deflection angle of the adjustment fan blade (704), so as to achieve accurate adjustment of the temperature of the lower area of ​​the drying chamber (1); Step 4: When clearing the blockage in step 2, by analyzing the spray range of the spray head (8), a cleaning brush is correspondingly arranged in the direction of the extension plate (702) close to the inner wall of the drying chamber (1). As the extension plate (702) rotates, the cleaning brush can clean the boron carbide powder adhered to the inner wall of the drying chamber (1); Step 5: During the passive clearing of the blockage in step 2, the characteristics of the connection unit (10) are utilized to cause the pressure in the feed pipe (601) to form a pulse change, so as to flush out and clear the impurities blocking the spray port (802).

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