A dryer for vitamin B1 preparation

Abstract

The present application relates to the technical field of vitamin B1 preparation drying, and specifically discloses a drying machine for vitamin B1 preparation, which comprises a dust removal box body and a feeding bin body respectively assembled on the upper and lower ends of a drying cylinder body, and a driving device and a back blowing device are arranged on the dust removal box body; the driving device comprises a driving member and a driving frame, the driving frame is divided into several installation areas, a plurality of filter cartridges are arranged in each installation area, and the output end of the driving member is connected with the driving frame; the back blowing device comprises an air inlet pipe, a guide sleeve and a guide pipe, the air inlet pipe is arranged on the side wall of the dust removal box body, the guide sleeve is arranged below the filter cartridge, the air inlet pipe and the guide sleeve are connected with the same installation area, and the guide pipe is coaxially arranged with the drying cylinder body; the upper end of the guide pipe is connected with the guide sleeve, and the lower end is located at the bottom of the drying cylinder body; the drying machine for vitamin B1 preparation has the effect of improving the drying efficiency.

Description

Technical Field

[0001] This invention relates to the technical field of drying in the preparation of vitamin B1, and more specifically to a dryer for the preparation of vitamin B1. Background Technology

[0002] Crude or crystalline vitamin B1 products obtained in industrial production contain a large amount of free water and water of crystallization. This moisture promotes hydrolysis and oxidative decomposition, resulting in a decrease in the content and purity of the active ingredients. It also easily breeds microorganisms, causing spoilage and clumping, which shortens the shelf life. At the same time, the poor flowability of damp materials is not conducive to subsequent crushing, dispensing, and packaging processes. Therefore, the production process must remove excess moisture through drying to stabilize product quality, improve processing adaptability, and extend shelf life.

[0003] Chinese patent document CN201926256U discloses a dryer for producing enamine, an intermediate of vitamin B1. The dryer includes a feeding device, a blower, a flash dryer, a cyclone separator, a bag filter, and an induced draft fan. The discharge port of the feeding device is connected to the feed port of the flash dryer. The blower is mounted at the feed port of the flash dryer and is tangentially positioned at the same height as the feed inlet. The directional high-speed airflow generated by the blower blows, disperses, and agitates the enamine material entering the flash dryer. During operation, the dust-laden exhaust gas after drying in the flash dryer flows through the cyclone separator, carrying residual fine dust, and is then sent to the bag filter. The treated exhaust gas is finally guided to the atmosphere by the induced draft fan.

[0004] To ensure continuous filtration and stable dust removal efficiency, conventional baghouse dust collectors generally adopt a compartmentalized structure, dividing the dust collector into two independent filtration chambers. During operation, the chambers work alternately. When one chamber stops filtration and starts pulse jet cleaning, the other chamber maintains normal flue gas filtration. This alternating cleaning of the two chambers ensures uninterrupted dust removal operation of the entire dust collector.

[0005] However, this solution also has the following problems: The equipment's internal airflow remains continuous. After the dust is removed from the filter bags by the pulsed airflow in the cleaning chamber, the fine dust particles, guided by the continuous airflow, will flow into the other side of the normal filtration chamber and re-adhere to the filter bag surface, causing secondary dust entrainment and cross-flow of dust between chambers. This phenomenon not only significantly reduces the efficiency of a single pulse-jet cleaning cycle but also continuously increases the overall operating resistance of the filter bags, ultimately reducing the drying efficiency of the vitamin B1 preparation process. Summary of the Invention

[0006] This invention provides a dryer for the preparation of vitamin B1, aiming to solve the problem of low drying efficiency caused by cross-compartment return of dust during cleaning in existing equipment.

[0007] The dryer for vitamin B1 preparation of the present invention includes a dust collection box and a feeding hopper respectively assembled at the upper and lower ends of a drying cylinder. The dust collection box is equipped with a driving device and a back-blowing device. The driving device includes a driving component and a driving frame. The driving frame is divided into several installation areas, and multiple sets of filter cartridges are assembled in each installation area. The output end of the driving component is connected to the driving frame. The back-blowing device includes an air inlet pipe, a guide sleeve, and a guide pipe. The air inlet pipe is located on the side wall of the dust collection box, and the guide sleeve is located in the area below the filter cartridges. The air inlet pipe and the guide sleeve are connected to the same installation area. The guide pipe is coaxially arranged with the drying cylinder. The upper end of the guide pipe is connected to the guide sleeve, and the lower end is located at the bottom of the drying cylinder. The driving component drives the driving frame to rotate, so that each installation area passes through the guide sleeve in sequence. The air inlet pipe is connected to an air compressor. The air compressor performs back-blowing on the filter cartridges through the air inlet pipe. The dust that falls off during back-blowing flows into the guide pipe through the guide sleeve and is guided by the guide pipe to fall to the bottom of the drying cylinder.

[0008] The effect is that by placing the filter cartridge within a switchable drive frame and establishing a fixed correspondence between the backflushing area and the guide sleeve and guide pipe, during filter cartridge cleaning, vitamin B1 powder detached from the filter cartridge surface does not need to undergo a large-scale diffusion process within the equipment. Instead, it directly enters the guide pipe along a predetermined path and is transported to the bottom of the drying cylinder, achieving controllable powder recovery path. Since the powder does not form a large area of ​​floating and circulating within the dust collector during cleaning, it effectively reduces the mutual influence of dust between different filtration stations, allowing the filter cartridge still in the filtration state to maintain a low accumulation rate and a relatively stable filtration permeability. Simultaneously, the powder recovered to the bottom of the cylinder can re-participate in subsequent drying processes, reducing effective material loss and improving drying efficiency.

[0009] Preferably, the driving component includes a drive motor, a drive rod, a drive sleeve, and a one-way bearing; the drive sleeve is coaxially connected to the drive frame, the drive rod is coaxially arranged inside the drive sleeve, the one-way bearing connects the drive sleeve and the drive rod respectively, and the output shaft of the drive motor is connected to the drive rod for transmission; a cleaning device is provided on the guide tube; the drive rod extends through the drive sleeve into the guide tube and is connected to the guide tube; when the motor rotates forward, the drive rod drives the guide tube and the cleaning device to rotate and clean the drying cylinder, while the drive sleeve and the drive frame remain stationary; when the motor rotates in reverse, the one-way bearing locks the transmission, and the drive rod drives the drive sleeve and the drive frame to rotate synchronously through the one-way bearing.

[0010] Its effect is that by constructing a dual-mode transmission relationship through the drive rod, drive sleeve and one-way bearing, the filter cartridge can be switched by simply changing the rotation direction of the drive motor, so that the various functions can be switched in an orderly manner according to the process requirements, thereby improving the coordination of equipment operation and power utilization.

[0011] Preferably, the guide tube includes a fixed part and a rotating part, the fixed part is fixedly connected to the guide sleeve, the rotating part is rotatably engaged with the fixed part, and the cleaning device is disposed on the rotating part.

[0012] Its effect is that by using a fixed part and a rotating part separately, the guide sleeve always maintains a stable flow guiding state, while the cleaning device can rotate independently around the cylinder to operate, and the two do not interfere with each other.

[0013] Preferably, the lower end of the rotating part is provided with a control component, which includes an elastic component and a control sleeve; the control sleeve is slidably mounted on the outside of the drive rod, the elastic component is connected to the control sleeve, and a guide slope is formed on the side of the control sleeve; in the normal initial position, the elastic component drives the control sleeve to move upward, and the guide slope presses against the lower end of the rotating part to block the guide tube; in the backflushing and backflush stage, the backflushing airflow presses down the control sleeve to slide downward, and the guide slope disengages from the rotating part to open the guide tube.

[0014] Its effect lies in the fact that the backflushing airflow pressure drives the control component to automatically open the guide pipe, and the elastic component automatically returns it to a closed state after the backflushing ends. The opening and closing control of the guide channel can be completed without additional actuators, which helps to reduce the phenomenon of accidental material discharge and ensures that the airflow flows along the predetermined path during normal drying. At the same time, it prevents the drying airflow from carrying material into the guide pipe when cleaning the filter cartridge without backflushing.

[0015] Preferably, the cleaning device includes a connecting rod and a cleaning component. One end of the connecting rod is connected to the rotating part, and the other end is connected to the cleaning component. The cleaning component rotates and abuts against the inner wall of the drying cylinder.

[0016] Its effect is that the connecting rod drives the cleaning parts to rotate and move continuously along the inner wall of the drying cylinder, which can promptly scrape off the materials and dust adhering to the inner wall, reduce the long-term accumulation of materials and the formation of clumps, ensure that the inside of the drying cylinder is kept in a good clean state, and at the same time reduce the possibility of material residue affecting subsequent batch production.

[0017] Preferably, the cleaning components are arranged around the inner wall of the drying cylinder, and the whole structure has a continuous wave-shaped undulating structure along the height direction of the drying cylinder; the inner wall of the drying cylinder is provided with scraping components, which work together with the cleaning components to clean the cleaning components.

[0018] Its effect is that the continuous wave-shaped cleaning component can cover different height areas of the cylinder and work with the scraper to remove the surface deposits simultaneously, so that the cleaning component can maintain effective scraping ability for a long time, reduce the problem of reduced cleaning effect due to material accumulation, and thus maintain a stable cleaning effect on the inner wall of the cylinder.

[0019] Preferably, the scraping component includes a sliding seat, an intermediate plate, and a scraper. The sliding seat is slidably mounted on the inner wall of the drying cylinder. The scraper is mounted on the sliding seat through the intermediate plate. The scraper has a scraping groove, and the inner wall of the scraping groove slides against the side of the cleaning component.

[0020] Its effect is that the sliding seat can move up and down with the contour of the cleaning part, so that the scraper always sticks to the surface of the cleaning part to scrape it, which helps to reduce the residual material on the surface of the cleaning part and improve the stability of the entire self-cleaning operation.

[0021] Preferably, the intermediate plate and the sliding seat are rotatably coupled.

[0022] Its effect is that after the middle plate and the sliding seat form a rotational engagement, the scraper can automatically adjust the contact angle according to the change of the posture of the cleaning part, avoiding local uneven wear or insufficient contact, making the scraping process more stable, and ensuring the cleaning effect on the cleaning part.

[0023] Preferably, the outer side of the drive frame is spaced apart from the inner wall of the drying cylinder, and two baffles are provided inside the dust collector box, with the air inlet pipe located between the two baffles; the installation area at the air inlet pipe is rotated to abut against the baffle, thereby connecting the installation area to the air inlet pipe separately and isolating it from the other installation areas.

[0024] Its effect is that by isolating the backflushing area from the normal filtration area through the baffle, the backflushing airflow only acts on the target installation area, avoiding airflow crosstalk between different workstations. While ensuring the dust removal effect, it does not affect the continuous filtration work of other filter cartridges, which is conducive to the continuous and stable operation of the equipment.

[0025] Preferably, the upper end of the guide sleeve has an opening, and the open side of the guide sleeve rotatably abuts against the lower end of the drive frame.

[0026] Its effect is that the guide sleeve opening and the lower end of the drive frame keep in close contact, which can form a relatively stable sealed connection when the installation area is switched to the backflushing position, reduce the leakage of powder to the outside during the backflushing process, improve the efficiency of powder diversion and recovery, and further ensure the working stability of the backflushing station.

[0027] Beneficial effects: By setting up a rotatable drive frame, a high-pressure backflushing air inlet pipe and a guide pipe, the present invention collects and transports the blown-off dust to the bottom of the drying cylinder, which can avoid dust suspension and dispersion and secondary adhesion to adjacent filter cartridges, stabilize the filtration effect of the filter cartridges and improve the drying efficiency. Attached Figure Description

[0028] Figure 1 This is a front view of the present invention.

[0029] Figure 2 This is a side view of the present invention.

[0030] Figure 3 This is a schematic diagram of the internal structure of the drying cylinder in this invention.

[0031] Figure 4 This is a schematic diagram of the internal structure of the dust removal box in this invention.

[0032] Figure 5 This is a schematic diagram of the backflush device in this invention.

[0033] Figure 6 yes Figure 5 A magnified view of a portion of point A in the middle.

[0034] Figure 7 This is a partially exploded schematic diagram of the drive frame and drive rod in this invention.

[0035] Figure 8 This is a schematic diagram of the cleaning device in this invention.

[0036] Figure 9 yes Figure 8 A magnified view of a portion of point B in the middle.

[0037] Reference numerals: 1. Drying cylinder; 2. Dust collector; 21. Baffle; 22. Exhaust pipe; 3. Feed hopper; 4. Dispersing device; 5. Drive device; 51. Drive component; 511. Drive motor; 512. Drive rod; 513. Drive sleeve; 514. One-way bearing; 515. Intermediate rod; 52. Drive frame; 521. Installation area; 6. Backflushing device; 61. Air inlet pipe; 62. Guide sleeve; 63. Guide pipe; 631. Fixed part; 632. Rotating part; 64. Control component; 641. Elastic component; 642. Control sleeve; 7. Filter cartridge; 8. Cleaning device; 81. Connecting rod; 82. Cleaning component; 83. Scraper; 831. Sliding seat; 832. Intermediate plate; 833. Scraper. Detailed Implementation

[0038] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0039] like Figures 1 to 9As shown, the dryer for vitamin B1 preparation of the present invention includes a drying cylinder 1, a dust collection chamber 2, a feeding hopper 3, a dispersing device 4, a driving device 5, a back-blowing device 6, a filter cartridge 7, and a cleaning device 8. The drying cylinder 1 serves as the drying area for vitamin B1 materials. The feeding hopper 3 is mounted directly below the drying cylinder 1. A blower is connected to the external side wall of the feeding hopper 3 to continuously supply hot drying air into the hopper. The vitamin B1 raw material to be processed is stored inside the feeding hopper 3. The feeding hopper 3 can be adjusted left and right. The dust collection chamber 2 is fixedly mounted on the drying cylinder 1. Above the drying cylinder 1, the filter cartridge 7 is installed inside the dust collector 2 to perform gas-solid separation filtration. The dispersing device 4 is built inside the feed hopper 3 to stir and disperse the accumulated vitamin B1 material. The back-blowing device 6 is used to blow the filter cartridge 7 with reverse airflow to remove material. The drive device 5 is linked with the filter cartridge 7 and the cleaning device 8 respectively. On the one hand, it can drive the filter cartridge 7 with accumulated material to rotate and move to the corresponding position of the back-blowing device 6 to complete the cleaning. On the other hand, it can link with the cleaning device 8 to operate synchronously to scrape and clean the material attached to the inner wall of the drying cylinder 1.

[0040] When the equipment is working, the material is first placed in the feeding hopper 3, and then the feeding hopper 3 is moved horizontally to the bottom of the drying cylinder 1. Then, the hot air delivered by the blower is sent in from the bottom of the feeding hopper 3. The airflow penetrates the material layer in the hopper from bottom to top. With the help of the dispersing device 4, the loose material is continuously stirred, and the vitamin B1 material is blown up and suspended and carried upward with the hot air to the inside of the drying cylinder 1. The material is fully in contact with the high temperature hot air in the drying cylinder 1 to complete the drying and dehydration process. The mixed airflow carrying the dried vitamin B1 product continues to flow upward into the top dust collection box 2. After the airflow is intercepted by the filter cartridge 7, the solid vitamin B1 product is intercepted and collected, and the clean airflow is discharged outward. During the operation of the equipment, the drive device 5 can be started at the same time to rotate the filter cartridge 7 with the attached material to the position of the back-blowing device 6. The reverse airflow blows off the finished material accumulated on the surface of the filter cartridge 7. At the same time, the drive device 5 is linked with the cleaning device 8 to operate synchronously, continuously scraping and cleaning the residual vitamin B1 material adhering to the inner wall of the drying cylinder 1 to avoid the material from accumulating and agglomerating, which would affect the drying and recycling efficiency.

[0041] Reference Figure 3 , Figure 4 , Figure 5 , Figure 6The back-flushing device 6 includes an air inlet pipe 61, a guide sleeve 62, a guide pipe 63, and a control component 64. The air inlet pipe 61 is fixedly installed on the outer wall of the dust collector 2, and the port of the air inlet pipe 61 is connected to an air compressor to provide a high-pressure air source for the entire back-flushing cleaning process. The guide sleeve 62 is arranged in the area below the filter cartridge 7 inside the dust collector 2 to receive the dust material falling off the filter cartridge 7 during cleaning. The guide pipe 63 is arranged coaxially and concentrically with the drying cylinder 1. The top of the guide pipe 63 is connected to the internal cavity of the guide sleeve 62, and the bottom end of the guide pipe 63 extends to the bottom of the drying cylinder 1. The control component 64 is assembled and fixed at the lower end of the guide pipe 63 and is used to control the opening and closing of the bottom of the guide pipe 63.

[0042] When the equipment is running and cleaning, the drive unit 5 drives the filter cartridge 7 to be cleaned to rotate and move, and transfers the filter cartridge 7 to the corresponding position directly above the guide sleeve 62. Then, the external air compressor outputs high-pressure airflow, which is sent into the dust collector 2 through the air inlet pipe 61 on the side wall of the box. The reverse blowing operation is completed from the inside of the filter cartridge 7 outward. The dry dust attached to the outer wall of the filter cartridge 7 falls off and falls under the action of high-pressure reverse blowing air. The fallen dry dust material falls directly into the guide sleeve 62 below, and then all of it is gathered into the coaxial guide pipe 63 connected to it by the gathering and guiding structure of the guide sleeve 62. At the same time, the control component 64 opens the bottom of the guide pipe 63, and then continues to guide downward along the inner wall of the guide pipe 63, and finally flows to the bottom position of the drying cylinder 1.

[0043] The guide pipe 63 directs the flow of dry dust material detached from the backflushing of the filter cartridge 7, which can collect and transport the high dryness dust generated during cleaning to the bottom area of ​​the drying cylinder 1, avoiding the random dispersion and accumulation of dust. This makes the overall dryness and wetness of the material in the drying cylinder 1 more uniform and stable, and the material layer distribution more stable. At the same time, the closed flow channel of the guide pipe 63 directionally collects the detached dust, which greatly reduces the situation where the dry dust detached from the cleaning is quickly adsorbed and flowed back to the surface of the adjacent filter cartridge 7 after being suspended and diffused. This effectively reduces the additional dust accumulation load of the adjacent filter cartridge 7, reduces the airflow blockage and ventilation resistance increase caused by repeated dust accumulation in the filter cartridge 7, and continuously ensures the stable ventilation and filtration capacity of each filter cartridge 7, maintaining the stable and efficient drying and filtration operation of the entire dust removal equipment.

[0044] Reference Figure 5 , Figure 6 The control component 64 includes an elastic element 641 and a control sleeve 642. The control sleeve 642 is coaxially slidably mounted on the guide tube 63 and can perform up-and-down reciprocating sliding movement along the axis of the guide tube 63. The elastic element 641 is set as a spring and is fixedly connected to the control sleeve 642 to provide a continuous upward reset driving force for the control sleeve 642. The side wall of the control sleeve 642 is integrally formed with an inclined guide slope.

[0045] When the device is in its normal initial working position before the backflushing process is started, the elastic element 641 releases elastic thrust to drive the control sleeve 642 to maintain its upward sliding limit position. The guide slope on the side of the control sleeve 642 is tightly pressed against the lower end face of the guide tube 63. The tight contact between the slope and the lower end of the rotating part 632 blocks the flow channel inside the guide tube 63, blocks the airflow in the pipeline, and prevents the dry airflow from carrying materials into the guide tube 63.

[0046] When the equipment enters the backflushing and backflushing working stage, high-pressure backflushing airflow is introduced into the guide pipe 63. The pressure of the backflushing airflow is greater than the pressure of the drying airflow. The airflow acts downward on the control sleeve 642 to form downward pressure. This downward pressure overcomes the upward elastic thrust of the elastic element 641, causing the control sleeve 642 to slide downward. After the control sleeve 642 moves downward, the guide slope of its side wall simultaneously moves downward and disengages from the lower end of the guide pipe 63. A flow gap is formed between the slope and the rotating part 632, and the internal channel of the originally closed guide pipe 63 is opened. The airflow can complete the backflushing and backflushing operation through the guide pipe 63, and the cleaned dust can be discharged from the bottom of the guide pipe 63.

[0047] Reference Figure 3 , Figure 5 , Figure 7 The drive unit 5 includes a drive component 51 and a drive frame 52. The drive frame 52 is installed in the internal chamber of the dust collector 2 with a rotatable assembly structure. The drive frame 52 is divided into multiple installation areas 521. Multiple sets of filter cartridges 7 are assembled in each installation area 521. The power output end of the drive component 51 is connected to the drive frame 52 to drive the drive frame 52 to complete the circumferential rotation. The air inlet pipe 61 and the guide sleeve 62 are combined to form a fixed back-blowing air supply station. The air supply passage is always connected to the same installation area 521.

[0048] When the equipment starts the filter cartridge 7 back-flushing dust removal process, the drive component 51 continuously outputs rotational power and drives the drive frame 52 inside the dust collector 2 to rotate circumferentially. During the continuous rotation of the drive frame 52, all the installation areas 521 inside it will move one by one in a fixed rotation sequence to the fixed back-flushing position corresponding to the air inlet pipe 61 and the guide sleeve 62. The high-pressure airflow is used to perform high-pressure jet back-flushing dust removal on the filter cartridge 7 inside the currently aligned installation area 521 through the air inlet pipe 61. As the drive frame 52 rotates continuously, the remaining installation areas 521 that carry the filter cartridge 7 will be switched to the back-flushing position in sequence. In this way, the same set of air inlet pipe 61 is used to supply air and the filter cartridge 7 in each installation area 521 is back-flushing cleaned in batches in sequence, so as to complete the dust removal and cleaning work of all filter cartridges 7 in sequence, and achieve cleaning without stopping the machine.

[0049] Reference Figure 3 , Figure 5 , Figure 7 The upper end of the guide sleeve 62 is provided with an opening, and the open side of the guide sleeve 62 rotates and abuts against the lower end of the drive frame 52, so that when the installation area 521 rotates to the top of the guide sleeve 62, the sealing between the guide sleeve 62 and the drive frame 52 is guaranteed, and the phenomenon of dust leakage during backflush is reduced.

[0050] Reference Figure 1 , Figure 4 The dust collector housing 2 includes baffles 21 inside the housing and an exhaust pipe 22 outside the housing. A gap is reserved between the outer wall of the drive frame 52 and the inner wall of the drying cylinder 1 to form a flow space. Two baffles 21 are provided, and the air inlet pipe 61 is arranged in the middle of the two baffles 21. The filter cartridge 7 installation area 521 rotates synchronously with the drive frame 52. When any set of installation areas 521 rotates to the corresponding position of the air inlet pipe 61, the side wall of the installation area 521 can fit tightly against the two baffles 21. With the help of the two baffles 21, a sealed separation structure is formed, so that the installation area 521 under this position is connected to the air inlet pipe 61 alone, and the airflow of the installation area 521 is isolated from all other installation areas 521 of the equipment. All installation areas 521 outside the baffles 21 are connected to the exhaust pipe 22 outside the housing through the flow space.

[0051] By relying on the separation and limiting structure of the baffle 21, the installation area 521 that is rotated to the back-flushing cleaning station can be independently isolated. The other installation areas 521 that do not participate in the back-flushing operation continue to maintain normal filtration conditions. After the dust-laden airflow is filtered and purified by the corresponding filter cartridge 7, the clean airflow can be directly discharged to the outside through the exhaust pipe 22. This realizes that the equipment's back-flushing cleaning process and normal filtration process operate independently and synchronously in separate areas. The airflows of the two processes do not cross-flow and interfere with each other, effectively avoiding the problem of turbulent working conditions caused by the mutual collision of cleaning airflow and filtration airflow, and improving the airflow stability during the continuous operation of the entire dust removal equipment.

[0052] Reference Figure 3 , Figure 5 , Figure 7The driving component 51 includes a drive motor 511, a drive rod 512, a drive sleeve 513, and a one-way bearing 514. The drive sleeve 513 is coaxially assembled and fixedly connected to the drive frame 52. The drive sleeve 513 is vertically arranged through the drive frame 52. The drive rod 512 is arranged inside the drive sleeve 513 along the central axis. The one-way bearing 514 is assembled between the drive rod 512 and the drive sleeve 513, and cooperates with both the drive rod 512 and the drive sleeve 513 respectively, thereby establishing the connection between the drive rod 512 and the drive sleeve 513. The drive sleeves 513 have a switchable clutch transmission engagement relationship; the power output shaft of the drive motor 511 is connected to the end of the drive rod 512, and the output torque of the drive motor 511 can be directly transmitted to the drive rod 512 to make it rotate around its own central axis; the guide tube 63 is connected to the cleaning device 8, one end of the drive rod 512 extends through the internal cavity of the drive sleeve 513 until it extends into the guide tube 63, and an intermediate rod 515 is provided between the extended end of the drive rod 512 and the guide tube 63 to connect the two.

[0053] When the output shaft of the drive motor 511 rotates in the forward direction, the one-way bearing 514 is in a disengaged and slipping state. The drive rod 512 rotates independently only by the power of the motor, and synchronously drives the cleaning device 8 to rotate together through the guide tube 63, performing a rotary cleaning process on the inner wall of the drying cylinder 1. The drive sleeve 513 cannot obtain torque because the one-way bearing 514 is spinning idly, and the drive frame 52, which is fixed to it on the same axis, remains stationary and does not rotate. When it is necessary to drive the drive frame 52 to move synchronously, the drive motor 511 is controlled to output torque in the reverse direction and rotate in the reverse direction. The one-way bearing 514 enters a locked engagement state due to the relative steering action. A rigid transmission connection is established between the drive rod 512 and the drive sleeve 513. The rotational power of the drive rod 512 is synchronously transmitted to the drive sleeve 513 through the locked one-way bearing 514, thereby driving the drive frame 52, which is fixed to the same axis as the drive sleeve 513, to rotate, so as to drive the installation area 521 at different positions to rotate to the backflushing position.

[0054] Reference Figure 5 , Figure 6 The control sleeve 642 is slidably sleeved on the outside of the drive rod 512, and the elastic element 641 is sleeved on the outside of the drive rod 512, with the end of the elastic element 641 connected to the drive rod 512 to drive the control sleeve 642 to move upward.

[0055] Reference Figure 5The guide tube 63 includes a fixed part 631 and a rotating part 632. The fixed part 631 is fixedly connected to the guide sleeve 62, and the rotating part 632 is rotatably engaged with the fixed part 631. The cleaning device 8 is disposed on the rotating part 632. When the drive motor 511 drives the drive rod 512 to rotate, the fixed part 631 remains fixed, that is, the guide sleeve 62 is in a fixed state, and the rotating part 632 rotates relative to the fixed part 631, thereby driving the cleaning device 8 to rotate, thus avoiding the phenomenon that the guide sleeve 62 interferes with the rotation of the cleaning device 8.

[0056] Reference Figure 3 , Figure 8 , Figure 9 The cleaning device 8 includes a connecting rod 81, a cleaning component 82, and a scraping component 83. One end of the connecting rod 81 is fixedly mounted on the rotating part 632, and the other end is securely connected to the cleaning component 82. The cleaning component 82 continuously forms a rotating, close-fitting contact with the inner wall of the drying cylinder 1. The scraping component 83 cooperates with the cleaning component 82 to clean the cleaning component 82. During equipment operation, the drive rod 512 outputs power and drives the rotating part 632 to rotate circumferentially. The rotating part 632 in the rotating state relies on the connecting rod 81 to clean the cleaning component 82. The connecting rod 81 synchronously transmits torque, thereby driving the cleaning component 82 to rotate in a circular motion along with the rotating part 632. During the rotation process, the contact point between the cleaning component 82 and the inner wall of the drying cylinder 1 is continuously changed, so that the cleaning component 82 can sequentially adhere to various parts of the inner wall of the drying cylinder 1 to complete the scraping and wiping operation. In this way, the entire inner wall of the drying cylinder 1 is continuously cleaned in all directions, effectively removing material residues, clumps, dust and other impurities attached to the inner wall of the drying cylinder 1, and stably realizing the automatic cleaning function of the inner wall of the drying cylinder 1.

[0057] The cleaning components 82 are arranged circumferentially along the inner wall of the drying cylinder 1, forming a continuous wave-like undulating structure along the vertical axis of the drying cylinder 1. This wave structure has regularly alternating high-level protrusions and low-level depressions, with a uniform transition in height and continuous connection from beginning to end, without any straight or interrupted areas. Relying on the continuous axial wave-like undulating shape of the cleaning components 82, during the rotation operation, their staggered wave structure can completely cover the entire vertical area of ​​the inner wall of the drying cylinder 1, leaving no blind spots. The cleaning components 82 can scrape off the clumps of material adhering to the cylinder wall, and the scraper 83 can remove residual powder accumulated on the cleaning components 82 in real time. This two-way synergy ensures that the inner wall of the drying cylinder 1 remains clean for a long time, maintaining the drying efficiency of the material.

[0058] Reference Figure 8 , Figure 9The scraping component 83 includes a sliding seat 831, an intermediate plate 832, and a scraper 833. The sliding seat 831 is slidably mounted up and down along the inner wall of the drying cylinder 1. The scraper 833 is fixedly installed on the sliding seat 831 by means of the intermediate plate 832. The scraper 833 body has a scraping groove adapted to the shape of the cleaning component 82. The inner side wall of the scraping groove and the outer side surface of the cleaning component 82 are in a sliding fit and abutment state.

[0059] During the continuous rotation of the cleaning component 82, driven by the continuous concave and convex structure of the cleaning component 82, the sliding seat 831 will synchronously generate periodic up-and-down reciprocating motion. The intermediate plate 832 and the scraper 833 together move up and down along the inner wall of the drying cylinder 1, so that the inner wall of the scraper groove can fully fit and contact the entire area on the cleaning component 82, without cleaning dead corners, scraping off the material attached to the surface of the cleaning component 82, and realizing the cleaning of the material on the cleaning component 82.

[0060] Reference Figure 9 The intermediate plate 832 and the sliding seat 831 are rotatably engaged. When the cleaning part 82 rotates, the sliding seat 831 moves up and down while the intermediate plate 832 can rotate relative to the sliding seat 831, so that the scraper 833 can adapt to the continuously changing shape of the cleaning part 82, so that the scraper 833 and the cleaning part 82 maintain a stable engagement state, ensuring the scraping effect on the cleaning part 82.

[0061] The implementation principle of this invention is as follows: When the equipment is in operation to the point where the filter cartridge 7 needs to be cleaned by backflushing, the drive component 51 outputs power, which drives the drive frame 52 to rotate synchronously through the drive rod 512 and drive sleeve 513 transmission connection structure. The multiple sets of filter cartridges 7 carried by the drive frame 52 are respectively set in the independent installation area 521, and rotate synchronously with the drive frame 52 to continuously switch the work position. After any installation area 521 carrying the filter cartridge 7 rotates to the work position where the guide sleeve 62 and the air inlet pipe 61 are directly opposite each other, the high-pressure airflow is delivered to the corresponding filter cartridge 7 through the air inlet pipe 61 to complete the high-pressure backflushing operation of the filter cartridge 7. The dust material shed from the filter cartridge 7 is carried by a high-pressure airflow, passing through the guide sleeve 62 and flowing into the lower guide pipe 63. Simultaneously, the downward thrust generated by the high-pressure airflow acts on the control sleeve 642, pushing it downwards to overcome the pre-tightening force of the elastic element 641, thus releasing the blockage at the bottom of the guide pipe 63 and making the bottom of the guide pipe 63 fully open. The shed dust is continuously pushed by the high-pressure airflow, passing through the open bottom channel of the guide pipe 63 and being discharged into the bottom area of ​​the drying cylinder 1. The equipment continuously rotates the drive frame 52, causing each installation area 521 to sequentially rotate to the purging station, completing the batch-by-batch backflushing cleaning process for all filter cartridges 7. The dust blown off is collected and transported to the bottom of the drying cylinder 1, which effectively avoids the problem of dry dust floating and dispersing everywhere during the dust removal process, and secondary adsorption and backflow to the outer wall of adjacent uncleaned filter cartridges 7. This ensures that the filter cartridges 7 maintain a clear filtration path in the long term and guarantees their filtration performance. At the same time, the dust collected at the bottom of the drying cylinder 1 can be re-mixed into the main material system inside the cylinder, and fully mixed with the material to be dried. This results in more uniform heating and drying of the material, thereby improving the drying efficiency.

[0062] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A dryer for the preparation of vitamin B1, comprising a dust collection chamber and a feeding hopper respectively assembled at the upper and lower ends of a drying cylinder, characterized in that, The dust collector housing is equipped with a drive unit and a back-flushing device. The drive unit includes a drive component and a drive frame. The drive frame is divided into several installation areas, and multiple sets of filter cartridges are installed in each installation area. The output end of the drive component is connected to the drive frame. The back-flushing device includes an inlet pipe, a guide sleeve, and a guide tube. The inlet pipe is located on the side wall of the dust collector housing, and the guide sleeve is located in the area below the filter cartridges. The inlet pipe and the guide sleeve are connected to the same installation area. The guide tube is coaxially arranged with the drying cylinder. The upper end of the guide tube is connected to the guide sleeve, and the lower end is located at the bottom of the drying cylinder. The drive component drives the drive frame to rotate, so that each installation area passes through the guide sleeve in sequence. The inlet pipe is connected to an air compressor. The air compressor performs back-flushing on the filter cartridges through the inlet pipe. The dust that falls off during back-flushing flows into the guide tube through the guide sleeve and is guided by the guide tube to the bottom of the drying cylinder. The drive unit includes a drive motor, a drive rod, a drive sleeve, and a one-way bearing. The drive sleeve is coaxially connected to the drive frame, and the drive rod is coaxially arranged inside the drive sleeve. The one-way bearing connects the drive sleeve and the drive rod respectively, and the output shaft of the drive motor is connected to the drive rod for transmission. A cleaning device is provided on the guide tube. The drive rod extends through the drive sleeve into the guide tube and is connected to the guide tube. When the motor rotates forward, the drive rod drives the guide tube and the cleaning device to rotate and clean the drying cylinder, while the drive sleeve and drive frame remain stationary. When the motor rotates in reverse, the one-way bearing locks the transmission, and the drive rod drives the drive sleeve and drive frame to rotate synchronously through the one-way bearing. The guide tube includes a fixed part and a rotating part. The fixed part is fixedly connected to the guide sleeve, and the rotating part is rotatably engaged with the fixed part. The cleaning device is located on the rotating part. The lower end of the rotating part is provided with a control component, which includes an elastic element and a control sleeve. The control sleeve is slidably mounted on the outside of the drive rod. The elastic element is connected to the control sleeve, and a guide slope is formed on the side of the control sleeve. In the normal initial position, the elastic element drives the control sleeve to move upward, and the guide slope presses against the lower end of the rotating part to block the guide tube. In the backflush stage, the backflush airflow presses down on the control sleeve to slide downward, and the guide slope disengages from the rotating part to open the guide tube. The dust collector box is equipped with two baffles, and the air inlet pipe is located between the two baffles. The installation area at the air inlet pipe is rotated to abut against the baffle, thereby connecting the installation area to the air inlet pipe separately and isolating it from the other installation areas. The upper end of the guide sleeve has an opening, and the open side of the guide sleeve rotates and abuts against the lower end of the drive frame.

2. The dryer for vitamin B1 preparation according to claim 1, characterized in that, The cleaning device includes a connecting rod and a cleaning component. One end of the connecting rod is connected to the rotating part, and the other end is connected to the cleaning component. The cleaning component rotates and abuts against the inner wall of the drying cylinder.

3. The dryer for vitamin B1 preparation according to claim 2, characterized in that, The cleaning components are arranged around the inner wall of the drying cylinder, and the whole structure has a continuous wave-like undulating structure along the height of the drying cylinder; the inner wall of the drying cylinder is equipped with scraping components, which work together with the cleaning components to clean the cleaning components.

4. The dryer for vitamin B1 preparation according to claim 3, characterized in that, The scraping component includes a sliding seat, an intermediate plate, and a scraper. The sliding seat is slidably mounted on the inner wall of the drying cylinder. The scraper is mounted on the sliding seat through the intermediate plate. The scraper has a scraping groove, and the inner wall of the scraping groove slides against the side of the cleaning component.

5. The dryer for the preparation of vitamin B1 according to claim 4, characterized in that, The intermediate plate and the sliding seat rotate together.

6. The dryer for the preparation of vitamin B1 according to claim 1, characterized in that, The drive frame is arranged at intervals with the inner wall of the drying cylinder.

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