Energy-saving type continuous drying machine for chemical powder

Abstract

An energy-saving continuous dryer for chemical powder relates to the field of chemical powder material drying equipment and integrates feeding pretreatment, multi-stage grading drying, cooling shaping, waste heat recovery and discharging conveying units, a powder agglomeration structure is scattered through a stirring turning plate, and dust raising loss is reduced through negative-pressure closed conveying. The material gathering and heating rollers are matched with the multi-layer overturning guide frame to achieve powder graded drying, and the problems of over-drying and insufficient drying of traditional equipment are solved; secondary agglomeration of the powder is avoided through rotating airflow field cooling; the shell-and-tube heat exchanger recovers waste heat to reduce energy consumption; and a visual observation window monitors the operation state in real time. The equipment realizes continuous and intelligent drying of chemical powder, improves drying efficiency and product quality, reduces energy consumption and maintenance cost, and is suitable for large-scale production of various chemical powder.

Description

Technical Field

[0001] This invention relates to the field of chemical powder material drying equipment, specifically to an energy-saving continuous dryer for chemical powders. Background Technology

[0002] As a fundamental raw material in the chemical, building materials, and pharmaceutical industries, the quality of chemical powder drying directly affects the stability of subsequent processing steps and the quality of finished products. Currently, traditional box-type drying and airflow drying processes are commonly used for chemical powder drying. However, in practical applications, many technical shortcomings that urgently need to be addressed have gradually emerged.

[0003] In the powder feeding pretreatment stage, chemical powders, due to their fine particle size and large specific surface area, are prone to agglomeration and clumping during storage and transportation. Traditional feeding equipment lacks an effective dispersing structure, and when agglomerated powder directly enters the drying process, insufficient heating area prevents the internal moisture from escaping completely. Furthermore, traditional feeding methods often employ open or semi-open conveying systems, resulting in significant powder dust loss, which not only wastes raw materials but also pollutes the production environment. In addition, different batches of powder are easily mixed and left behind in the conveying channel, causing cross-contamination and increasing the workload of equipment cleaning and maintenance.

[0004] In the core drying process, traditional equipment often employs a single hot air direct blowing or drum drying mode, without classifying the powder particles according to their size. Small-diameter powders, due to their light weight, are easily carried quickly through the drying zone by the hot air, resulting in over-drying and reduced powder activity. Large-diameter powders, on the other hand, suffer from insufficient residence time, making it difficult for internal moisture to evaporate completely, resulting in under-dried defective products and low drying uniformity and yield. Furthermore, traditional equipment uses limited methods for controlling the hot air direction and speed, failing to flexibly adjust heat exchange efficiency according to powder characteristics. This leads to high energy consumption and low efficiency in the drying process, making it difficult to meet the needs of large-scale production.

[0005] The cooling process for high-temperature powders after drying also has technical flaws. Traditional cooling methods are mostly natural cooling or simple air cooling, which are slow and uneven. The residual heat carried by the powder cannot be dissipated quickly, which can easily cause secondary agglomeration and damage the loose structure of the powder. Some powders may even undergo changes in physicochemical properties such as crystal transformation and component decomposition due to residual heat, which seriously affects the stability of product quality.

[0006] In terms of energy utilization, traditional drying equipment lacks a waste heat recovery system. A large amount of waste heat generated during the drying process is directly emitted with the exhaust gas, resulting in low energy utilization and high production costs, which contradicts the current industrial trend of energy conservation, environmental protection, cost reduction and efficiency improvement.

[0007] In the discharge conveying stage, traditional conveying devices have a fixed structure and lack linkage control functions with the waste heat recovery process. Powder is prone to scattering and loss during the waste heat recovery stage. After the recovery is completed, it is difficult to achieve fast and smooth conveying, which cannot adapt to the operation rhythm of continuous production lines and restricts the improvement of overall production efficiency.

[0008] In addition, traditional drying equipment is mostly a closed structure without an effective visual monitoring window. Operators cannot observe the flow of powder inside the equipment and the drying process in real time, making it difficult to predict and deal with faults such as powder blockage and uneven drying in advance, resulting in a high incidence of production accidents and increased equipment operation and maintenance costs.

[0009] In conclusion, developing a chemical powder drying equipment that integrates powder dispersing pretreatment, precise drying by grading, rapid cooling and shaping, waste heat recovery and utilization, intelligent discharge conveying, and visualization of operating status has become an urgent need to solve current industry pain points and promote the upgrading of chemical powder drying technology. Summary of the Invention

[0010] To address the shortcomings of existing technologies, this invention provides an energy-saving continuous dryer for chemical powders, which solves problems such as powder agglomeration, uneven drying, waste of residual heat, inconvenient discharge, invisible operation, and dust pollution during the drying of chemical powders.

[0011] To achieve the above objectives, the present invention provides the following technical solution: An energy-saving continuous dryer for chemical powder includes a central square frame, a transfer support base fixed above the central square frame, an installation limiting plate fixed on the upper surface of the transfer support base, and a first support frame and a second support frame fixed on the two transverse end faces of the transfer support base, respectively.

[0012] As an optimized solution, the first support frame is equipped with a feeding unit, the second support frame is equipped with a waste heat recovery unit, the mounting limiting plate is equipped with a multi-stage continuous drying unit, and the transfer support seat is equipped with a discharge conveying unit.

[0013] As an optimized solution, the multi-stage continuous drying unit includes two transversely symmetrical and longitudinally extended material heating rollers, the two ends of which are rotatably mounted on the longitudinal inner wall of the mounting limiting plate.

[0014] As an optimized solution, the multi-stage continuous drying unit also includes four rotating guide frames that are equally spaced and alternately arranged from top to bottom. The ends of two rotating guide frames that are spaced apart are swung and mounted on the same longitudinal inner wall of the mounting limiting plate via a rotating shaft. A diversion mesh plate is fixed in the middle of each rotating guide frame.

[0015] As an optimized solution, each of the flipping guide frames is provided with an airflow guide frame on one longitudinal side. The airflow guide frame is fixed on the longitudinal inner wall of the mounting limit plate. An air inlet diversion box is fixed on the longitudinal outer wall of the mounting limit plate. An air inlet is provided between the airflow guide frame and the air inlet diversion box. An electric heating plate is fixed inside the air inlet diversion box.

[0016] As an optimized solution, each of the airflow guide frames is provided with a rotating airflow guide plate.

[0017] As an optimized solution, side air boxes connected to the outer end faces of the two air inlet distribution boxes located on the same side are fixed, and pulse speed regulating fans are installed inside the side air boxes.

[0018] As an optimized solution, the multi-stage continuous drying unit also includes a cooling duct, which is rotatably positioned directly below the four flip guide frames.

[0019] As an optimized solution, the central square frame is horizontally grounded, and four centrally symmetrical support columns are fixed at the four corners of the upper surface of the central square frame. The upper ends of the four support columns are fixed to the lower surface of the transfer support base.

[0020] As an optimized solution, the transfer support is a rectangular frame with a longitudinal opening, the mounting limiting plate is a U-shaped frame with the opening facing downwards, and the mounting limiting plate has openings on both sides in the lateral direction.

[0021] As an optimized solution, both the first support frame and the second support frame are inverted L-shaped frames, and the lower ends of the first support frame and the second support frame are grounded.

[0022] As an optimized solution, the discharge conveying unit includes two longitudinally symmetrical extended plates. The extended plates are fixed to the longitudinal side end face of the central square frame. A lifting telescopic cylinder is fixed to one side of the upper surface of each extended plate. A lifting support frame is fixed to the upper telescopic end of the lifting telescopic cylinder. The lifting support frame is a U-shaped frame with the opening facing upward.

[0023] As an optimized solution, two lifting support frames are fixed with conveying side plates on the same side transverse end faces. The middle section of the conveying side plate passes through the transfer support seat and extends to both sides. Two longitudinally symmetrical conveying rollers are rotatably installed between the two conveying side plates. A discharge conveyor belt is sleeved between the two conveying rollers. A conveying drive motor is fixed on the transverse outer wall of one of the conveying side plates. The output shaft of the conveying drive motor passes through the conveying side plate and is fixed to the side end face of one of the conveying rollers.

[0024] As an optimized solution, two discharge guide seats are respectively provided below both ends of the discharge conveyor belt, and the two discharge guide seats are respectively fixed on the two lifting support frames.

[0025] As an optimized solution, a square material discharge port is provided in the middle of the upper surface of the transfer support.

[0026] As an optimized solution, the feeding unit includes a turning and mixing box, which is fixed on the upper surface of the first support frame. The turning and mixing box is a cylindrical box that is arranged horizontally and open at both ends. Circular cover plates are fixed at the two openings of the turning and mixing box respectively.

[0027] As an optimized solution, a square inlet pipe is fixedly connected to the upper side of the mixing and processing box.

[0028] As an optimized solution, a guide cone seat is fixed on the outer wall of the circular end cap near the mounting limit plate, and a feeding bend is fixedly connected to the guide cone seat.

[0029] As an optimized solution, a stirring drive motor is fixed on the outer wall of the circular end cap away from the installation limiting plate. The output shaft of the stirring drive motor passes through the circular end cap and is fixed with a stirring shaft. Several stirring flaps are fixed on the stirring shaft.

[0030] As an optimized solution, the feeding processing unit further includes a feeding transfer box, which is a square box with a gradually narrowing bottom. The feeding transfer box is fixed on the upper surface of the mounting limiting plate. The upper surface of the mounting limiting plate has a feed inlet in the middle that communicates with the feeding transfer box, and the two material gathering heating rollers are located directly below the feed inlet.

[0031] As an optimized solution, the upper end of the feeding bend is fixedly connected to the feeding transfer box, and a negative pressure conveying pump connected to it is fixed on the transverse outer wall of one side of the feeding transfer box. The negative pressure conveying pump is located on the opposite side of the feeding bend.

[0032] As an optimized solution, a top fan is fixed to the middle of the upper surface of the feeding transfer box.

[0033] As an optimized solution, two symmetrical rotary drive motors are fixed on the longitudinal outer wall of one side of the mounting limiting plate. The output shaft ends of the rotary drive motors pass through the side wall of the mounting limiting plate and are fixed to the side end face of the corresponding polymer heating roller.

[0034] As an optimized solution, the interior of the polymer heating roller is hollow.

[0035] As an optimized solution, an electric heating box is fixed on the longitudinal outer wall of the other side of the mounting limiting plate. Two metal heating rods are connected to the electric heating box. The ends of the two metal heating rods pass through the mounting limiting plate and extend into the cavities of the two polymer heating rollers.

[0036] As an optimized solution, four transmission boxes are fixed on the longitudinal outer wall of the mounting limit plate corresponding to the four flip guide frames. Each transmission box is equipped with a transmission mechanism that drives the flip guide frame to flip around the axis. The transmission mechanism includes a transmission motor, a transmission wheel, and a transmission chain.

[0037] As an optimized solution, an air inlet grille is fixed inside the air inlet, a power supply module electrically connected to the heating plate is fixed on the outer wall of the air inlet diversion box, and a rotation drive module connected to the flipping airflow guide plate is fixed on the transverse outer wall of the airflow guide frame.

[0038] As an optimized solution, the cooling duct is a longitudinally extending, closed cylindrical tube, and three centrally symmetrical cooling air inlets are opened on the outer peripheral wall of the cooling duct, with an isolation net fixed inside each cooling air inlet.

[0039] As an optimized solution, a stepper motor is fixed on the longitudinal outer wall of the mounting limiting plate, facing the cooling duct. The output shaft end of the stepper motor passes through the mounting limiting plate and is fixed to the closed end face of the cooling duct.

[0040] As an optimized solution, a compressed air pump is fixed on the longitudinal outer wall of the other side of the mounting limiting plate, facing the cooling air duct. The compressed air pump is connected to an air inlet pipe, and the end of the air inlet pipe passes through the mounting limiting plate and extends into the cooling air duct.

[0041] As an optimized solution, the waste heat recovery unit includes a collecting cone hopper, which is located directly below the cooling duct. The two longitudinal ends of the collecting cone hopper are respectively fixed on the longitudinal inner wall of the mounting limiting plate, and the lower end of the collecting cone hopper is connected to the discharge port.

[0042] As an optimized solution, a liquid flow channel is provided inside the collecting cone hopper.

[0043] As an optimized solution, a waste heat recovery box is fixed on the upper surface of the second support frame, and a shell-and-tube heat exchanger is fixedly installed in the middle of the waste heat recovery box. Two liquid exchange pipes are connected to the shell-and-tube heat exchanger, and the ends of the two liquid exchange pipes are fixed on the transverse outer wall of the collecting cone and connected to the liquid flow channel.

[0044] As an optimized solution, glass observation windows are fixed in the horizontal openings on both sides of the mounting limiting plate, and the lower end of the glass observation window is fixed to the upper end face of the collecting cone.

[0045] Compared with the prior art, the beneficial effects of the present invention are: 1. The pretreatment of materials has a significant effect, ensuring uniformity in subsequent drying. The mixing chamber of this equipment features a built-in high-speed rotating stirring plate that effectively breaks down agglomerated chemical powders, dispersing clumps into loose particles and preventing incomplete drying due to powder agglomeration. A negative pressure conveying pump, combined with a feeding bend and a feeding transfer box, enables closed-loop powder conveying, reducing dust and loss. When the top fan rotates forward, it blows downwards, dispersing the powder in the transfer box and ensuring even distribution to the drying station. When the fan rotates in reverse, it blows upwards, cleaning the transfer box and connecting channels, preventing contamination from mixing different batches of powder and reducing the difficulty of equipment cleaning and maintenance.

[0046] 2. Multi-stage continuous drying is precise and controllable, significantly improving drying efficiency and quality. The heating rollers in this equipment feature a hollow structure combined with metal heating rods for heating, ensuring a stable and controllable surface temperature. When the two rollers rotate in opposite directions at low speed, they gather and clamp the powder, allowing for full contact between the powder and the heating roller surface, achieving preliminary heating and drying, and rapidly evaporating surface moisture. This equipment utilizes a grading structure of "four-layer rotating guide frames + diversion screens" to achieve differentiated drying of powders with different particle sizes, solving the problems of over-drying and under-drying in traditional equipment and improving drying quality. The four layers of rotating guide frames are alternately arranged from top to bottom, working in conjunction with the sieving action of the diversion screens to achieve particle size classification of the powder: smaller particle sizes are dried faster. The powder quickly passes through the mesh and falls, while larger particles roll along the upper surface of the distribution screen, extending the contact time with hot air and ensuring that powders of different sizes are fully dried. This solves the technical problem of "over-drying small particles and under-drying large particles" in traditional drying equipment. The airflow guide frame is equipped with an adjustable-angle rotating airflow guide plate, which precisely controls the direction of the hot air and allows for full convection heat exchange between the hot air and the rolling powder. The pulse speed-regulating fan can adjust the hot air speed, and together with the angle adjustment of the rotating guide frame, it can flexibly control the residence time of the powder in the drying channel, ensuring that the internal moisture of the powder is fully released and improving the uniformity and stability of the dried powder.

[0047] 3. Cooling and shaping are fast and efficient, preventing secondary agglomeration of powder. The cooling duct in this equipment can rotate around its axis under the drive of a stepper motor. Combined with the cold air introduced by the compressed air pump, it is sprayed out through three cooling ducts to form a rotating airflow field. The high-temperature powder comes into full contact with the rotating cold air during its fall, achieving rapid cooling and effectively preventing secondary agglomeration or changes in physicochemical properties of the powder due to residual heat. The isolation mesh inside the cooling duct can prevent powder from entering the cooling duct, ensuring long-term stable operation of the equipment and reducing the failure rate.

[0048] 4. Waste heat recovery and recycling result in significant energy savings. The collecting cone is equipped with a liquid flow channel. After cooling, the powder falls into the collecting cone and comes into contact with the inner wall of the cone. The small amount of residual heat is absorbed by the circulating coolant in the flow channel. The shell-and-tube heat exchanger in the waste heat recovery box is connected to the liquid flow channel. The coolant exchanges the absorbed waste heat with the low-temperature medium on the other side of the shell-and-tube heat exchanger, realizing the recovery and reuse of waste heat. The recovered waste heat can be used for preheating drying hot air or other processes, reducing the overall energy consumption of the equipment and conforming to the industrial development trend of energy conservation and environmental protection.

[0049] 5. Flexible and controllable material conveying, adaptable to continuous production needs. The discharge conveying unit controls the lifting and lowering of the discharge conveyor belt through a lifting telescopic cylinder to control the opening and closing of the discharge port: when the powder is undergoing waste heat recovery, the conveyor belt is close to the discharge port to prevent the powder from scattering outward; after the recovery is completed, the conveyor belt descends, the discharge port opens, and the powder falls smoothly onto the conveyor belt; the conveyor drive motor drives the conveyor belt to operate, realizing the continuous conveying of finished powder, adapting to the continuous operation requirements of industrial production lines, and improving production efficiency.

[0050] 6. Real-time visibility of operating status facilitates operation and adjustment. The glass observation windows on both sides of the installation limit plate allow operators to observe the flow and drying status of the powder in the drying channel in real time, promptly detect problems such as powder blockage and uneven drying, and ensure stable operation of the equipment and reduce the incidence of production accidents by adjusting parameters such as the angle of the flipping guide frame and the hot air speed.

[0051] This invention integrates powder dispersing and conveying, graded drying, cooling and shaping, and waste heat recovery, realizing continuous, intelligent, and energy-saving drying of chemical powders. It effectively improves drying efficiency and product quality, reduces energy consumption and maintenance costs, and is suitable for large-scale drying operations of various chemical powders. Attached Figure Description

[0052] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0053] Figure 1 This is a schematic diagram of the overall external structure of the present invention in the main viewing direction; Figure 2 This is a schematic diagram of the overall external structure of the present invention from a top-down perspective; Figure 3 This is a schematic diagram of the overall external structure of the present invention from the left-side view direction; Figure 4 This is a schematic diagram of the overall external structure of the present invention from the right-side view direction; Figure 5 This is an isometric schematic diagram of the three-dimensional structure of the present invention; Figure 6 For the present invention along Figure 2 A schematic diagram of the internal structure cut along line AA. Figure 7 For the present invention along Figure 1 A schematic diagram of the internal structure cut along the middle BB line; Figure 8 For the present invention along Figure 1 A schematic diagram of the internal structure cut along the CC line; Figure 9 For the present invention along Figure 1 A schematic diagram of the internal structure cut along the DD line in the middle; Figure 10 For the present invention along Figure 1 A schematic diagram of the internal structure cut along the EE line.

[0054] In the diagram: 1-Central square frame, 2-Supporting column, 3-Transfer support seat, 4-Installation limit plate, 5-First support frame, 6-Second support frame, 7-Extended flat plate, 8-Lifting telescopic cylinder, 9-Lifting support frame, 10-Conveying side plate, 11-Conveying roller, 12-Discharge conveyor belt, 13-Conveying drive motor, 14-Discharge guide seat, 15-Discharge port, 16-Turning and mixing box, 17-Circular cover plate, 18-Inlet square pipe, 19-Guide cone seat, 20-Feeding bend, 21-Turning drive motor, 22-Turning shaft, 23-Mixing flap, 24-Feeding transfer box, 25-Inlet, 26-Glass observation window, 27-Negative pressure conveying pump, 28-Top fan 29-Heating roller for material collection, 30-Rotation drive motor, 31-Electric heating box, 32-Metal heating rod, 33-Tilting guide frame, 34-Transmission box, 35-Diverter screen, 36-Airflow guide frame, 37-Liquid exchange pipe, 38-Air inlet, 39-Air inlet grille, 40-Air inlet diverter box, 41-Electric heating plate, 42-Power supply module, 43-Tilting airflow guide plate, 44-Rotation drive module, 45-Side air box, 46-Pulse speed regulating fan, 47-Cooling duct, 48-Cooling air outlet, 49-Isolation net, 50-Stepper motor, 51-Compressed air pump, 52-Air inlet pipe, 53-Collecting cone, 54-Liquid flow channel, 55-Waste heat recovery box, 56-Shell-tube heat exchanger. Detailed Implementation

[0055] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0056] like Figures 1 to 10 As shown, the energy-saving continuous dryer for chemical powder includes a central square frame 1, which is horizontally grounded. Four centrally symmetrical support columns 2 are fixed at the four corners of the upper surface of the central square frame 1. A transfer support seat 3 is fixed at the upper end of the four support columns 2. The transfer support seat 3 is a square frame seat with a longitudinal opening. A mounting limit plate 4 is fixed on the upper surface of the transfer support seat 3. The mounting limit plate 4 is a U-shaped frame plate with the opening facing downwards. The mounting limit plate 4 has openings on both sides in the lateral direction.

[0057] The first support frame 5 and the second support frame 6 are fixed on the two transverse side ends of the transfer support base 3, respectively. The first support frame 5 and the second support frame 6 are both inverted L-shaped frames, and the lower ends of the first support frame 5 and the second support frame 6 are grounded.

[0058] The first support frame 5 is equipped with a feeding unit, the second support frame 6 is equipped with a waste heat recovery unit, the installation limit plate 4 is equipped with a multi-stage continuous drying unit, and the transfer support 3 is equipped with a discharge conveying unit.

[0059] The discharge conveying unit includes two longitudinally symmetrical extended plates 7. The extended plates 7 are fixed on the longitudinal side end face of the central square frame 1. Each extended plate 7 has a lifting telescopic cylinder 8 fixed on one side of its upper surface. The upper telescopic end of the lifting telescopic cylinder 8 is fixed with a lifting support frame 9. The lifting support frame 9 is a U-shaped frame with the opening facing upward.

[0060] Two lifting support frames 9 are fixed with conveying side plates 10 on the same side transverse side end face. The middle section of the conveying side plate 10 passes through the transfer support seat 3 and extends to both sides. Two longitudinally symmetrical conveying rollers 11 are rotatably installed between the two conveying side plates 10. A discharge conveyor belt 12 is sleeved between the two conveying rollers 11. A conveying drive motor 13 is fixed on the transverse outer wall of one of the conveying side plates 10. The output shaft of the conveying drive motor 13 passes through the conveying side plate 10 and is fixed to the side end face of one of the conveying rollers 11.

[0061] Two discharge guide seats 14 are respectively provided at the lower ends of the discharge conveyor belt 12, and the two discharge guide seats 14 are respectively fixed on two lifting support frames 9.

[0062] A square material drop port 15 is provided in the middle of the upper surface of the transfer support 3. By controlling the extension and retraction of the lifting telescopic cylinder 8, the lifting support and the conveying side plate 10 are driven to rise and fall, so that the discharge conveyor belt 12 is close to or away from the material drop port 15, thereby controlling its opening and closing.

[0063] The feeding and processing unit includes a mixing and processing box 16, which is fixed on the upper surface of the first support frame 5. The mixing and processing box 16 is a cylindrical box arranged horizontally with openings at both ends. Circular cover plates 17 are fixed at the openings at both ends of the mixing and processing box 16.

[0064] A square inlet pipe 18 is fixedly connected to one side of the upper end of the mixing and processing box 16.

[0065] A guide cone seat 19 is fixed on the outer wall of the circular end cap near the installation limit plate 4, and a feeding bend 20 is fixedly connected to the guide cone seat 19.

[0066] A stirring drive motor 21 is fixed on the outer wall of the circular end cap away from the installation limit plate 4. The output shaft of the stirring drive motor 21 passes through the circular end cap and is fixed with a stirring shaft 22. Several stirring flaps 23 are fixed on the stirring shaft 22.

[0067] The feeding processing unit also includes a feeding transfer box 24, which is a square box with a gradually narrowing bottom. The feeding transfer box 24 is fixed on the upper surface of the mounting limit plate 4, and a feeding port 25 connected to the feeding transfer box 24 is opened in the middle of the upper surface of the mounting limit plate 4.

[0068] The upper end of the feeding bend 20 is fixedly connected to the feeding transfer box 24. A negative pressure conveying pump 27 is fixed on the transverse outer wall of one side of the feeding transfer box 24 and communicates with it. The negative pressure conveying pump 27 is located on the opposite side of the feeding bend 20. The air extraction end of the negative pressure conveying pump 27 is connected to the inside of the feeding transfer box 24. When the negative pressure conveying pump 27 is working, it creates a negative pressure in the feeding transfer box 24, and sucks the powder in the mixing and processing box 16 into the feeding transfer box through the feeding bend 20.

[0069] A top fan 28 is fixed in the middle of the upper surface of the feeding transfer box 24. When the top fan 28 rotates forward, it can blow away the powder in the feeding transfer box 24 to prevent it from accumulating. When it rotates in reverse, it can blow away and clean the powder remaining in the device.

[0070] The multi-stage continuous drying unit includes two transversely symmetrical and longitudinally extended material heating rollers 29. The interior of the material heating rollers 29 is hollow. Each material heating roller 29 is rotatably mounted on the longitudinal inner wall of the mounting limiting plate 4 at both ends. The two material heating rollers 29 are located directly below the feed inlet 25.

[0071] Two symmetrical rotary drive motors 30 are fixed on the longitudinal outer wall of one side of the mounting limit plate 4. The output shaft ends of the rotary drive motors 30 pass through the side wall of the mounting limit plate 4 and are fixed to the side end face of the corresponding material heating roller 29.

[0072] An electric heating box 31 is fixed on the longitudinal outer wall of the mounting limit plate 4. Two metal heating rods 32 are connected to the electric heating box 31. The ends of the metal heating rods 32 pass through the mounting limit plate 4 and extend into the cavity of the aggregate heating roller 29. By controlling the two aggregate heating rollers 29 to rotate in opposite directions, the chemical powder that enters the feeding transfer box 24 and falls through the feed port 25 can be gathered into the middle gap of the two aggregate heating rollers 29 and heated at the same time.

[0073] The multi-stage continuous drying unit also includes four flip guide frames 33, which are alternately arranged at equal intervals from top to bottom. The ends of two flip guide frames 33 arranged at intervals are mounted on the same longitudinal inner wall of the mounting limiting plate 4 by a rotating shaft. The flip guide frames 33 can be adjusted around the rotating shaft.

[0074] Four transmission boxes 34 are fixed on the longitudinal outer wall of the mounting limit plate 4, corresponding to the four flip guide frames 33. Each transmission box 34 is equipped with a transmission mechanism that drives the flip guide frame 33 to flip around the axis. The transmission mechanism includes a transmission motor fixed in the transmission box 34, an active transmission wheel connected to the output shaft of the transmission motor, a driven transmission wheel connected to the rotating shaft of the flip guide frame 33, and a transmission chain sleeved on the active transmission wheel and the driven transmission wheel. The transmission motor drives the active transmission wheel to rotate, and drives the driven transmission wheel and the flip guide frame 33 to flip around the axis through the transmission chain.

[0075] Each flipping guide frame 33 has a diversion screen plate 35 fixed in the middle. The flipping guide frame 33 and the diversion screen plate 35 are rotated by the transmission mechanism, which can adjust the rolling angle and speed of the chemical powder, thereby controlling the drying time.

[0076] Each flip guide frame 33 has an airflow guide frame 36 on one longitudinal side. The airflow guide frame 36 is fixed on the longitudinal inner wall of the mounting limit plate 4. An air inlet 38 connected to the airflow guide frame 36 is opened on the longitudinal inner wall of the mounting limit plate 4. An air inlet grille 39 is fixed inside the air inlet 38.

[0077] An air inlet diversion box 40 connected to the air inlet 38 is fixed on the longitudinal outer wall of the mounting limit plate 4. An electric heating plate 41 is fixed inside the air inlet diversion box 40. A power supply module 42 electrically connected to the electric heating plate 41 is fixed on the outer wall of the air inlet diversion box 40.

[0078] Each airflow guide frame 36 is equipped with a rotating airflow guide plate 43. A rotation drive module 44 connected to the rotating airflow guide plate 43 is fixed on the transverse outer wall of the airflow guide frame 36. The adjustment angle range of the rotating airflow guide plate 43 is 0°-90°. The air outlet direction can be changed by adjusting the angle of the rotating airflow guide plate 43 through the rotation drive module 44.

[0079] Two air inlet distribution boxes 40 located on the same side are fixed with side air boxes 45 connected to them, and pulse speed regulating fans 46 are installed inside the side air boxes 45.

[0080] The multi-stage continuous drying unit also includes a cooling duct 47, which is rotatably positioned directly below four flip guide frames 33. The cooling duct 47 is a longitudinally extending, enclosed cylindrical tube. Three centrally symmetrical cooling air inlets 48 are provided on the outer peripheral wall of the cooling duct 47. An isolation net 49 is fixed inside each cooling air inlet 48. The three cooling air inlets 48 are evenly distributed around the central axis of the cooling duct 47. When the cooling duct 47 rotates, cold air is ejected from the cooling air inlets 48 to form a rotating airflow field.

[0081] A stepper motor 50 is fixed on the longitudinal outer wall of the mounting limit plate 4, directly opposite the cooling duct 47. The end of the output shaft of the stepper motor 50 passes through the mounting limit plate 4 and is fixed to the closed end face of the cooling duct 47.

[0082] On the other side of the mounting limit plate 4, a compressed air pump 51 is fixed to the cooling air duct 47. The compressed air pump 51 is connected to an air inlet pipe 52. The end of the air inlet pipe 52 passes through the mounting limit plate 4 and extends into the cooling air duct 47. The cooling air duct 47 is rotated around the axis by a stepper motor 50, and then the compressed air pump 51 introduces cold air from the outside into the cooling air duct 47, which can realize the rotational jet cooling of chemical powder.

[0083] The waste heat recovery unit includes a collecting cone 53, which is located directly below the cooling duct 47. The two longitudinal ends of the collecting cone 53 are fixed to the longitudinal inner wall of the mounting limiting plate 4, and the lower end of the collecting cone 53 is connected to the discharge port 15.

[0084] A liquid flow channel 54 is provided inside the collecting cone 53.

[0085] The upper surface of the second support frame 6 is fixed with a waste heat recovery box 55. A shell-and-tube heat exchanger 56 is fixedly installed in the middle of the waste heat recovery box 55. Two liquid exchange pipes 37 are connected to the outside of the shell-and-tube heat exchanger 56. The ends of the two liquid exchange pipes 37 are fixed to the transverse outer wall of the collecting cone 53 and connected to the liquid flow channel 54. Water is introduced into the liquid flow channel 54 as circulating coolant. The coolant flows from top to bottom along the collecting cone 53. After absorbing the waste heat of the powder, it flows into the shell-and-tube heat exchanger 56 through the liquid exchange pipes 37 and exchanges heat with the low temperature air in the waste heat recovery box 55.

[0086] Glass observation windows 26 are fixed in the horizontal openings on both sides of the installation limiting plate 4, and the lower end of the glass observation window 26 is fixed to the upper end surface of the collecting cone 53.

[0087] When using this invention: First, perform material pretreatment: The chemical powder to be dried is fed into the mixing and processing box 16 through the feed square inlet pipe 18. The mixing drive motor 21 is started, which drives the mixing shaft 22 and the stirring flap 23 to rotate at high speed, so as to fully mix and disperse the powder in the box, breaking up the powder agglomeration structure and laying the foundation for subsequent uniform drying. After the mixing is completed, the negative pressure conveying pump 27 and the top fan 28 are started. The negative pressure conveying pump 27 creates a negative pressure environment in the feeding transfer box 24. Guided by the feeding bend pipe 20 and the guide cone seat 19, the loose powder in the mixing and processing box 16 is sucked into the feeding transfer box 24.

[0088] At this point, the direction of the top fan 28 can be adjusted according to needs: when rotating forward, the top fan 28 blows air downward, dispersing and agitating the chemical powder in the feeding transfer box 24, effectively breaking up bridging between powder particles, preventing powder from accumulating and clumping in the box, and ensuring that the powder can fall evenly and smoothly; when rotating in reverse, the top fan 28 outputs air upward, which can thoroughly clean the powder remaining in the feeding transfer box 24 and subsequent connecting channels, avoiding mixing and contamination of powders from different batches, and providing convenience for maintenance and cleaning after equipment shutdown. Finally, the powder falls evenly to the initial position of the multi-stage continuous drying unit through the feed inlet 25 on the installation limit plate 4.

[0089] Then, multi-stage continuous drying is performed: When the powder falls into the middle gap between the two aggregate heating rollers 29, the drive motor 30 is started to control the two aggregate heating rollers 29 to rotate at low speed in opposite directions. At the same time, the metal heating rod 32 connected to the electric heating box 31 continuously supplies heat to the hollow cavity of the aggregate heating roller 29, so that the surface of the heating roller maintains a preset constant high temperature.

[0090] Under the clamping and conveying action of the heated rollers and the friction, the powder is initially heated and dried, and the surface moisture evaporates rapidly. After being processed by the heated rollers, the powder falls onto the first layer of the flipping guide frame 33. The transmission motor in the transmission box 34 is started, and through the transmission action of the transmission wheel and transmission chain, the flipping guide frame 33 and the diversion screen plate 35 are driven to flip around the axis, adjusting the rolling angle and speed of the powder. During the rolling process, smaller powder particles will pass through the mesh of the diversion screen plate 35 first, while larger powder particles will continue to roll and fall. In this case, the contact time between the smaller powder particles and the drying airflow is shorter, while the contact time between the larger powder particles is longer, thereby achieving thorough drying of powders of different particle sizes. Simultaneously, the pulse speed-regulating fan 46 inside the side air box 45 starts, and the airflow is heated into hot air by the heating plate 41 when it passes through the air inlet diversion box 40. The hot air enters the airflow guide frame 36 through the air inlet grille 39. The rotation drive module 44 adjusts the angle of the flipping airflow guide plate 43, so that the hot air is precisely blown onto the rolling powder, realizing the convection drying of the powder. The powder passes through four layers of flipping guide frames 33 arranged alternately at equal intervals from top to bottom. Each time it passes through a guide frame, it completes a cycle of "diversion-hot air drying". By adjusting the flipping angle of each layer of flipping guide frame 33 and the hot air speed, the residence time of the powder in the drying channel can be precisely controlled to ensure that the internal moisture of the powder is fully released.

[0091] Then, cool and set the shape: Once the powder has been dried, it falls into the cooling duct 47 area. The stepper motor 50 and the compressed air pump 51 are then activated. The stepper motor 50 drives the cooling duct 47 to rotate slowly around its axis. The compressed air pump 51 pumps outside cold air into the cooling duct 47 through the air inlet pipe 52. The cold air is then ejected outwards through three cooling vents 48 on the outer wall of the duct, creating a rotating airflow field. During its descent, the high-temperature powder comes into full contact with the rotating cold air, rapidly cooling it and preventing secondary agglomeration or changes in properties due to residual heat. The isolation mesh 49 inside the cooling vents 48 effectively prevents powder from entering the cooling duct 47, ensuring stable equipment operation.

[0092] Then, waste heat recovery and material discharge conveying are carried out: The cooled powder falls into the collecting cone 53. Circulating coolant flows through the liquid channel 54 of the collecting cone 53. When the powder comes into contact with the inner wall of the cone, a small amount of residual heat it carries is absorbed by the coolant. The shell-and-tube heat exchanger 56 in the waste heat recovery tank 55 is connected to the liquid channel 54. The coolant transports the absorbed waste heat to the heat exchanger, where it exchanges heat with the low-temperature medium on the other side of the heat exchanger, thus achieving the recovery and reuse of waste heat and achieving energy saving.

[0093] When the powder is collected by the collecting cone 53 and waste heat is recovered, the lifting telescopic cylinder 8 is activated to keep the discharge conveyor belt 12 close to the lower end of the discharge port 15 to prevent the powder from scattering outward. After the waste heat recovery is completed, the lifting telescopic cylinder 8 is controlled to retract, driving the discharge conveyor belt 12 away from the discharge port 15, opening the discharge port 15, and then the powder falls onto the discharge conveyor belt 12. The conveyor drive motor 13 is started to drive the conveyor roller 11 and the discharge conveyor belt 12 to rotate, transporting the dried and cooled finished powder to the designated collection position.

[0094] During the operation of the process monitoring equipment, the operator can observe the flow status and drying condition of the powder in the drying channel in real time through the glass observation window 26 in the horizontal opening on both sides of the installation limit plate 4, and make timely adjustments.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. An energy-saving continuous dryer for chemical powders, characterized in that: It includes a central square frame, a transfer support base is fixed on the top of the central square frame, an installation limiting plate is fixed on the upper surface of the transfer support base, and a first support frame and a second support frame are fixed on the two transverse end faces of the transfer support base respectively. The first support frame is equipped with a feeding unit, the second support frame is equipped with a waste heat recovery unit, the mounting limiting plate is equipped with a multi-stage continuous drying unit, and the transfer support base is equipped with a discharge conveying unit. The multi-stage continuous drying unit includes two transversely symmetrical and longitudinally extended material heating rollers, with both ends of the material heating rollers rotatably mounted on the longitudinal inner wall of the mounting limiting plate; The multi-stage continuous drying unit also includes four rotating guide frames that are equally spaced and alternately arranged from top to bottom. The ends of two rotating guide frames that are spaced apart are swung and mounted on the same side of the longitudinal inner wall of the mounting limiting plate via a rotating shaft. A diversion mesh plate is fixed in the middle of each rotating guide frame. Each of the flipping guide frames is provided with an airflow guide frame on one longitudinal side. The airflow guide frame is fixed on the longitudinal inner wall of the mounting limit plate. An air inlet diversion box is fixed on the longitudinal outer wall of the mounting limit plate. An air inlet is provided between the airflow guide frame and the air inlet diversion box. An electric heating plate is fixed inside the air inlet diversion box. Each of the aforementioned airflow guide frames is respectively equipped with a rotating airflow guide plate; Two air inlet distribution boxes located on the same side are fixed with side air boxes that communicate with them, and pulse speed regulating fans are installed inside the side air boxes; The multi-stage continuous drying unit also includes a cooling duct, which is rotatably positioned directly below the four flip guide frames.

2. The energy-saving continuous dryer for chemical powders according to claim 1, characterized in that: The central square frame is horizontally grounded, and four centrally symmetrical support columns are fixed at the four corners of the upper surface of the central square frame. The upper ends of the four support columns are fixed to the lower surface of the transfer support base. The transfer support base is a square frame base with a longitudinal opening, the mounting limiting plate is a U-shaped frame plate with the opening facing downwards, and the mounting limiting plate has openings on both sides in the lateral direction. Both the first support frame and the second support frame are inverted L-shaped frames, and the lower ends of the first support frame and the second support frame are grounded.

3. The energy-saving continuous dryer for chemical powders according to claim 2, characterized in that: The discharge conveying unit includes two longitudinally symmetrical extended plates. The extended plates are fixed to the longitudinal side end face of the central square frame. A lifting telescopic cylinder is fixed to one side of the upper surface of each extended plate. A lifting support frame is fixed to the upper telescopic end of the lifting telescopic cylinder. The lifting support frame is a U-shaped frame with the opening facing upward. Two lifting support frames are fixed with conveying side plates on the same side transverse end face. The middle section of the conveying side plate passes through the transfer support seat and extends to both sides. Two longitudinally symmetrical conveying rollers are rotatably installed between the two conveying side plates. A discharge conveyor belt is sleeved between the two conveying rollers. A conveying drive motor is fixed on the transverse outer wall of one of the conveying side plates. The output shaft of the conveying drive motor passes through the conveying side plate and is fixed to the side end face of one of the conveying rollers. Two discharge guide seats are respectively provided below both ends of the discharge conveyor belt, and the two discharge guide seats are respectively fixed on the two lifting support frames; The transfer support has a square material discharge port in the middle of its upper surface.

4. The energy-saving continuous dryer for chemical powders according to claim 1, characterized in that: The feeding unit includes a mixing box, which is fixed on the upper surface of the first support frame. The mixing box is a cylindrical box that is arranged horizontally and open at both ends. Circular cover plates are fixed at the two openings of the mixing box. A square inlet pipe is fixedly connected to one side of the upper end of the mixing and processing box; A guide cone seat is fixed on the outer wall of the circular end cap near the mounting limiting plate, and a feeding bend is fixedly connected to the guide cone seat; A stirring drive motor is fixed on the outer wall of the circular end cap away from the installation limit plate. The output shaft of the stirring drive motor passes through the circular end cap and is fixed with a stirring shaft. Several stirring plates are fixed on the stirring shaft.

5. The energy-saving continuous dryer for chemical powders according to claim 4, characterized in that: The feeding processing unit also includes a feeding transfer box, which is a square box with a gradually narrowing bottom. The feeding transfer box is fixed on the upper surface of the mounting limiting plate. The upper surface of the mounting limiting plate has a feed inlet in the middle that communicates with the feeding transfer box. The two material heating rollers are located directly below the feed inlet. The upper end of the feeding bend is fixedly connected to the feeding transfer box. A negative pressure conveying pump connected to the feeding transfer box is fixed on one side of the transverse outer wall. The negative pressure conveying pump is located on the opposite side of the feeding bend. A top fan is fixed to the middle of the upper surface of the feeding transfer box.

6. The energy-saving continuous dryer for chemical powders according to claim 1, characterized in that: Two symmetrical rotary drive motors are fixed on one longitudinal outer wall of the mounting limiting plate. The output shaft ends of the rotary drive motors pass through the side wall of the mounting limiting plate and are fixed to the side end face of the corresponding polymer heating roller. The interior of the polymer heating roller is hollow; An electric heating box is fixed on the longitudinal outer wall of the other side of the mounting limiting plate. Two metal heating rods are connected to the electric heating box. The ends of the two metal heating rods pass through the mounting limiting plate and extend into the cavities of the two polymer heating rollers.

7. The energy-saving continuous dryer for chemical powders according to claim 1, characterized in that: Four transmission boxes are fixed on the longitudinal outer wall of the mounting limit plate corresponding to the four flip guide frames. Each transmission box is provided with a transmission mechanism that drives the flip guide frame to flip around the axis. The transmission mechanism includes a transmission motor, a transmission wheel and a transmission chain. An air inlet grille is fixed inside the air inlet, a power supply module electrically connected to the heating plate is fixed on the outer wall of the air inlet diversion box, and a rotation drive module connected to the flipping airflow guide plate is fixed on the transverse outer wall of the airflow guide frame.

8. The energy-saving continuous dryer for chemical powders according to claim 7, characterized in that: The cooling duct is a longitudinally extending, closed cylindrical tube. Three centrally symmetrical cooling air inlets are opened on the outer peripheral wall of the cooling duct, and an isolation net is fixed in each cooling air inlet. A stepper motor is fixed on the longitudinal outer wall of the mounting limiting plate, facing the cooling duct. The output shaft end of the stepper motor passes through the mounting limiting plate and is fixed to the closed end face of the cooling duct. A compressed air pump is fixed on the longitudinal outer wall of the other side of the mounting limiting plate, opposite the cooling air duct. The compressed air pump is connected to an air inlet pipe, and the end of the air inlet pipe passes through the mounting limiting plate and extends into the cooling air duct.

9. The energy-saving continuous dryer for chemical powders according to claim 3, characterized in that: The waste heat recovery unit includes a collecting cone, which is located directly below the cooling duct. The two longitudinal ends of the collecting cone are fixed to the longitudinal inner wall of the mounting limiting plate, and the lower end of the collecting cone is connected to the discharge port. The collecting cone hopper is provided with a liquid flow channel; A waste heat recovery box is fixed on the upper surface of the second support frame. A shell-and-tube heat exchanger is fixedly installed in the middle of the waste heat recovery box. Two liquid exchange tubes are connected to the shell-and-tube heat exchanger. The ends of the two liquid exchange tubes are fixed on the transverse outer wall of the collecting cone and are connected to the liquid flow channel.

10. The energy-saving continuous dryer for chemical powders according to claim 9, characterized in that: Glass observation windows are fixed in the horizontal openings on both sides of the installation limiting plate, and the lower end of the glass observation window is fixed to the upper end face of the collecting cone.

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