A drying apparatus and drying method for producing zinc oxide

Abstract

This invention belongs to the field of zinc oxide drying, specifically a drying equipment and method for zinc oxide production. It includes a drying tank with multiple observation windows fixed to its outer side and a packing tube fixed to its top. Multiple drying discs are fixed inside the tank, each with a central hole. The discs are arranged vertically at equal intervals, divided into two groups with different structures, and arranged alternately. Multiple rotating rakes are mounted on the top surface of each disc. This arrangement enables a gradual drying process for zinc oxide, ensuring uniform and thorough drying. Simultaneously, the continuous movement of the zinc oxide particles causes them to tumble, guaranteeing uniform heating and evaporation. Furthermore, it allows large zinc oxide particles to disperse and reduce their volume, facilitating the final product's recovery and storage.

Description

Technical Field

[0001] This invention belongs to the field of zinc oxide drying, specifically a drying equipment and method for zinc oxide production. Background Technology

[0002] Zinc oxide has a wide range of applications and is a key material in basic chemical and high-tech fields. About half of it is used as a rubber vulcanization activator to enhance the performance of products such as tires. In pharmaceuticals and cosmetics, it is a core ingredient in ointments and sunscreens, where it acts as an astringent and UV shield.

[0003] The preparation of zinc oxide typically uses zinc salts (such as zinc sulfate and zinc chloride) as raw materials, and obtains zinc hydroxide or basic zinc carbonate precursors through precipitation. These precursors are in the form of filter cakes or slurries, containing a large amount of water, and must be dried before high-temperature calcination to decompose them into zinc oxide.

[0004] Traditional drying equipment has a relatively simple structure, such as the common drum dryer, which dries zinc oxide by placing it into a constantly tumbling drum. This not only results in poor drying uniformity and easy clumping, leading to local over-drying and affecting product purity, but also has a large internal space in the drum, while the heating part is often the drum wall, resulting in excessive heat loss and a series of other problems.

[0005] Therefore, the present invention provides a drying equipment and a drying method for zinc oxide production. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: A drying device for zinc oxide production according to the present invention includes a drying tank. Multiple observation windows are fixedly connected to the outside of the drying tank, and a packing pipe is fixedly connected to the top of the drying tank. Multiple drying discs are fixedly connected inside the drying tank. A central hole is opened in the middle of each drying disc. The multiple drying discs are arranged vertically at equal intervals. Each drying disc consists of a first drying disc and a second drying disc with different structures. Multiple rotatable rakes are provided on the top surface of each drying disc. Temperature control valves and reflux valves for transferring and recovering heat medium to the drying discs are provided on the outside of the drying tank. Multiple discharge pipes are opened at the bottom of the drying tank. An exhaust pipe is fixedly connected to one side of the top of the drying tank. Each rake includes a series pipe and multiple friction arms that can rotate on the series pipe. The bottom of each friction arm can spray airflow. The temperature control valve is connected to the series pipe. This setup enables a gradual drying process for zinc oxide, ensuring uniform and thorough drying. Simultaneously, the continuous movement of the zinc oxide particles allows for constant tumbling, guaranteeing even heating and evaporation. Furthermore, it helps disperse large zinc oxide particles, reducing their volume and making the final product easier to recycle and store. By creating an air outlet structure at the bottom of the friction arm, the temperature control valve can redirect a portion of the steam originally injected into the drying tray to all the series pipes during the friction arm's rotation. The steam is then ejected from the air outlet structure at the bottom of the friction arm, forming an airflow barrier. This airflow barrier propels the zinc oxide, reducing component deformation caused by physical friction between the friction arm and the drying tray, thus minimizing the impact on equipment lifespan. Furthermore, by controlling the output of the temperature control valve, the airflow frequency delivered to the series pipes is modified to intermittent. When airflow is delivered, because the air outlet structure of the friction arm is located at the bottom, the friction arm moves upward under the reverse thrust of the airflow, restricting its rotation. When rotating upward, it can only rotate to a horizontal position at most. The system relies on airflow to transfer zinc oxide. When the airflow stops, the friction arm rotates under gravity, and its end sinks, bringing it into contact with the surface of the drying tray. However, the contact area is small, and the zinc oxide is then transported by its own friction. This dual-transportation method reduces the deformation of parts caused by long-term friction between the friction arm and the drying tray, while also preventing large zinc oxide particles from being unable to be pushed by insufficient airflow. Furthermore, the continuous oscillation of the friction arm effectively removes zinc oxide adhering to the top surface, keeping the friction arm clean. This ensures that the orderly spiral pushing mechanism of the equipment is not affected, and prevents zinc oxide from drying and caking on the friction arm, making the equipment's operation more stable and reliable.

[0008] Preferably, docking valves are installed on both sides of the friction arm, and two different types of adapter handles are provided on the outer side of the friction arm. The adapter handles are bent and connected to the friction arm through the docking valves. Airflow can be ejected from the bottom of the adapter handles. During operation, in order to improve the reliability and economy of the equipment, the friction arm is raised as a whole, and the air outlet structure at the bottom of the friction arm is transferred to the adapter handles. Originally, the friction arms used on each drying tray had different tilt directions. To facilitate production, all friction arms can be standardized. By installing different adapter handles on different sides of each friction arm, the required claws can be assembled later. This not only reduces the production difficulty, but also allows for individual replacement when a single adapter handle malfunctions, maintaining the long-term effective operation of the equipment. Furthermore, the bent adapter handles at the ends can better push the zinc oxide to move, ensuring the layer-by-layer transfer effect of zinc oxide.

[0009] Preferably, the friction arm is hollow inside and is divided into upper and lower sections. The two sections are pressed together and connected. The end of the friction arm away from the docking valve is forked, and each forked end of the friction arm has an adapter hole. Multiple sets of rotating rings corresponding to the adapter holes are rotatably connected to the outside of the series tube. During operation, in order to facilitate the replacement of the friction arm, the friction arm is changed to upper and lower sections, and the adapter hole position is connected with the rotating ring by pressing, thereby facilitating the disassembly and assembly of the two. The rotating ring has holes on its surface for transmitting airflow.

[0010] Preferably, the bottom of the adapter handle is equipped with two different structures, namely an airflow pipe and an ejector arm. The bottom of the airflow pipe is provided with multiple air jet holes, and the ejector arm is slidably engaged with the adapter handle. During operation, to further enhance the equipment's capabilities, multiple rakes on each drying tray employ different adapter handles. For example, all adapter handles on the first rake have an airflow pipe mounted at the bottom, while all adapter handles on the second rake have a top-mounted arm at the bottom. The difference between these two structures lies in the larger distance between the airflow pipe and the drying tray, and the ability to vent air from the bottom. The zinc oxide is primarily propelled by airflow, while also exhibiting a oscillating effect under intermittent airflow control. The top-mounted arm, under the influence of airflow, pushes downwards, primarily relying on friction to move the zinc oxide. When the airflow stops, the connected friction arm and adapter handle are pressed downwards by gravity, causing the top-mounted arm to retract. This friction removes residual zinc oxide from the surface of the top-mounted arm, resulting in more effective surface cleaning. The different adapter handle structures are sequentially mounted on different rakes, effectively transporting viscous, fine, and lumpy zinc oxide, significantly reducing the problem of zinc oxide remaining in one place and undergoing repeated drying, thus ensuring the quality of the finished product.

[0011] Preferably, the bottom edge of the ejector arm is smoothly rounded, and a small hole is provided at the bottom of the ejector arm. A spring is fixed between the ejector arm and the adapter handle. During operation, the small hole at the bottom of the ejector arm will spray a fine airflow downward when the ejector arm is ejected, thus forming an air film at the bottom. However, because the opening is small, the ejector arm will still forcefully push downward. In this way, the ejector arm will not rub violently against the drying tray, while it can also forcefully push the zinc oxide. The spring is used to assist the ejector arm in retracting.

[0012] Preferably, a support pipe is fixedly connected to the bottom perimeter of the drying tray and the drying tank, and a regulating valve is fixedly connected to the top of both the temperature control valve and the reflux valve. A connecting pipe is fixedly connected between the regulating valve and the bottom of the drying tray. During operation, the support pipe and the connecting pipe are used to keep the drying tray stable, while the regulating valve is used to ensure that the input airflow is uniformly delivered to the drying tray through the connecting pipe, so as to ensure that the surface temperature of the drying tray is suitable.

[0013] Preferably, a drive motor is fixedly connected to the bottom of the drying tank, and a transmission shaft is fixedly connected to the top output end of the drive motor. The transmission shaft passes through the central hole of all the drying trays and is connected to all the series pipes. A rotating shaft is fixedly connected to the bottom of the drying tank, and the temperature control valve is connected to the rotating shaft through a heat transfer pipe. During operation, the drive motor controls the rotation of the transmission shaft, which in turn drives all the claw rakes to rotate in the same direction, ensuring the smooth operation of the spiral transport of zinc oxide. Each drying tray has a central hole in the middle, through which the transmission shaft can pass smoothly. At the same time, the transmission shaft is a rotary joint for gas circuit, ensuring that steam is delivered to the hollow part of the transmission shaft while it rotates, ensuring that the airflow is transmitted to the friction arm.

[0014] Preferably, the top of the rotating shaft is provided with an overflow hole, and a dispersing platform is fixedly connected inside the packing tube. The top of the dispersing platform is set with a pointed angle, and a cover is fixedly connected to the bottom of the dispersing platform. The bottom of the cover is in contact with the top surface of the uppermost drying tray. During operation, the overflow hole can be connected from the bottom of the rotating shaft to allow the drying airflow to be introduced from bottom to top. This guides the internal water vapor to move upward and finally be discharged from the exhaust pipe. The dispersing platform in the packing tube can break up the added zinc oxide and let it fall into the uppermost drying tray from around the cover. The cover is used to block the central hole at the top of the drying tray to ensure the smooth progress of the feeding process.

[0015] A drying method for zinc oxide production, applicable to the aforementioned zinc oxide drying equipment, comprising the following specific steps: S1: The zinc oxide to be dried is put into the drying tank through the packing tube. The zinc oxide particles will fall into the middle of the uppermost drying tray. As the claw rake rotates continuously, the zinc oxide on the surface of the drying tray is pushed in the desired direction under the action of friction. S2: Zinc oxide will transfer downwards layer by layer, eventually reaching the bottom of the drying tank, and fall from the discharge pipe under the action of gravity. During the continuous movement of zinc oxide, high-temperature heat medium is continuously circulated in the drying tray, causing the moisture in the zinc oxide to evaporate and move upwards, and be discharged upwards through the exhaust pipe, thereby reducing the humidity inside the drying tank. S3: As the claw rake rotates and pushes the zinc oxide, it fills the zinc oxide neatly. Steam is ejected from the air outlet structure at the bottom of the friction arm, forming an airflow barrier at the bottom of the friction arm. The airflow barrier pushes the zinc oxide, reducing the damage to the equipment caused by direct friction. At the same time, the friction arm will also swing continuously during the rotation, reducing the adhesion of zinc oxide.

[0016] The specific operation steps for the swinging of the friction arm in S3 are as follows: Q1: Modify the frequency of the airflow delivered to the series pipe to intermittent. When the airflow is delivered, the friction arm will move upward under the reverse thrust of the airflow because the air outlet structure of the friction arm is located at the bottom. Q2: The rotation of the friction arm is limited. When rotating upward, it can only rotate to a horizontal position. At this time, the zinc oxide is transferred by airflow. When the airflow stops, the friction arm rotates under the action of gravity, and the end sinks. The end of the friction arm will stick to the surface of the drying tray. At this time, the zinc oxide is transported by its own friction, thus forming a continuous oscillating function.

[0017] The beneficial effects of this invention are as follows: 1. The drying equipment and method for zinc oxide production described in this invention, through the arrangement of drying trays and friction arms, completes the process of gradually drying zinc oxide. The drying process is uniform and thorough. At the same time, during the continuous movement of zinc oxide, the zinc oxide particles are constantly tumbling, ensuring uniform heating and evaporation. Simultaneously, large zinc oxide particles are continuously dispersed to reduce their volume, making the final product easy to recover and store. Furthermore, the alternating use of gas-driven and contact-driven methods during the movement not only effectively ensures the transfer of zinc oxide but also greatly reduces the problem of zinc oxide sticking to the claw rake.

[0018] 2. The drying equipment and method for zinc oxide production described in this invention improves the reliability and economy of the equipment by raising the friction arm as a whole and transferring the air outlet structure at the bottom of the friction arm to the adapter handle. Originally, the friction arms used on each drying tray had different tilt directions. To facilitate production, all friction arms can be standardized first. By installing different adapter handles on different sides of each friction arm, the required claws can be assembled later. This not only reduces the production difficulty, but also allows for individual replacement when a single adapter handle malfunctions, maintaining the long-term effective operation of the equipment. Furthermore, the bent adapter handle at the end can better push the zinc oxide to move, ensuring the layer-by-layer transfer effect of zinc oxide. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1 This is a perspective view of the present invention; Figure 2 This is a diagram of the internal structure of the present invention; Figure 3 This is a perspective view of the drying tray and control valve of the present invention; Figure 4 These are structural diagrams of two different drying trays of the present invention; Figure 5 This is a perspective view of the claw rake of the present invention; Figure 6 This is a perspective view of the series tube and friction arm of the present invention; Figure 7 This is an unfolded view of the friction arm of the present invention; Figure 8This is a perspective view of the two adapter handles of the present invention; Figure 9 This is a flowchart of the process flow of the present invention; In the diagram: 1. Drying tank; 2. Packing tube; 3. Exhaust pipe; 4. Observation window; 5. Control valve; 6. Temperature control valve; 7. Reflux valve; 8. Discharge pipe; 9. Drying tray; 10. Rake; 11. Rotating shaft; 12. Drive motor; 13. Cover; 14. Dispersion platform; 15. Connecting pipe; 16. Series pipe; 17. Friction arm; 18. Center hole; 20. Connecting valve; 21. Adapter hole; 22. Ejector arm; 23. Airflow pipe; 24. Rotating ring; 25. Adapter handle; 26. Drive shaft; 27. Heat transfer tube. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0022] like Figures 1 to 9 As shown in the embodiment of the present invention, a drying device for zinc oxide production includes a drying tank 1. Multiple observation windows 4 are fixedly connected to the outer side of the drying tank 1. A packing tube 2 is fixedly connected to the top of the drying tank 1. Multiple drying discs 9 are fixedly connected inside the drying tank 1. A central hole 18 is opened in the middle of each drying disc 9. The multiple drying discs 9 are arranged vertically at equal intervals. Each drying disc 9 consists of a first drying disc 91 and a second drying disc 92 with different structures. Multiple rotatable rakes 10 are provided on the top surface of each drying disc 9. A temperature control valve 6 and a reflux valve 7 are provided on the outer side of the drying tank 1 for transferring and recovering heat medium to the drying discs 9. Multiple discharge pipes 8 are opened at the bottom of the drying tank 1. An exhaust pipe 3 is fixedly connected to one side of the top of the drying tank 1. Each rake 10 includes a series pipe 16 and multiple friction arms 17 that can rotate on the series pipe 16. The bottom of each friction arm 17 can spray airflow. The temperature control valve 6 is connected to the series pipe 16. Zinc oxide particles to be dried are fed into the drying tank 1 through the packing tube 2. The zinc oxide particles fall into the center of the uppermost drying tray 9. As the claw rake 10 rotates continuously, the friction arms 17 on the claw rake 10 have different inclination directions depending on the different drying trays 9. If the friction arms 17 are tilted outward, they will push the zinc oxide on the surface of the drying tray 9 outward under friction during rotation. At the same time, the positions of the friction arms 17 on different claw rakes 10 on each drying tray 9 are also different. If all the friction arms 17 are connected in a ring, they will form a spiral line that spreads outward. This causes the zinc oxide falling from above to move outward under the rotation of multiple claw rakes 10, ultimately... The zinc oxide falls outwards from the edge of the topmost first drying tray 91, while the second drying tray 92 below has a larger diameter than the topmost first drying tray 91 and is basically in contact with the inner wall of the drying tank 1, thus effectively receiving the zinc oxide falling from above. At the same time, the lower claw rake 10 rotates in the same direction but tilts in the opposite direction. Under the frictional rotation, it pushes the zinc oxide inward. The second drying tray 92 has a large central hole 18 in the middle, which pushes the zinc oxide to the middle position and then it falls from the central hole 18 into the lower drying tray 9. The lower drying trays 9 are arranged in a continuous cycle of first drying tray 91, second drying tray 92, first drying tray 9, and second drying tray 92. The difference between the first drying tray 91 and the second drying tray 92 is that the diameter of the first drying tray 91 is smaller than that of the second drying tray 92, while the central hole of the second drying tray 92 is larger than that of the first drying tray 91. Therefore, zinc oxide discharged from the periphery of the first drying tray 91 will be caught by the edge of the second drying tray 92. Zinc oxide discharged from the center of the second drying tray 92 will fall to a more central position on the first drying tray 91, but will not fall through the central hole 18. This transfer path is repeated, and the zinc oxide will transfer downwards layer by layer, eventually reaching the bottom of the drying tank 1. Under the action of gravity, it will fall from the discharge pipe 8. The discharge pipe 8 is located at the bottom of the drying tank 1, and the bottom of the drying tank 1 is concave. A central obstruction allows the finished product to be discharged from multiple discharge pipes 8. Simultaneously, as the zinc oxide moves, a high-temperature heat medium, which can be water vapor, continuously circulates in the drying tray 9, causing the moisture within the zinc oxide to evaporate and rise, being discharged upwards through the exhaust pipe 3. This reduces the humidity inside the drying tank 1, allowing the equipment to perform the drying process for an extended period. This setup achieves a gradual drying process for zinc oxide, ensuring uniform and thorough drying. Furthermore, the continuous movement of the zinc oxide particles causes them to tumble, guaranteeing uniform heating and evaporation. It also allows large zinc oxide particles to disperse and reduce their volume, making the final product easier to recover and store. However, the zinc oxide freshly injected into the drying tank 1 has a high moisture content and is very viscous. Under the frictional propulsion of the friction arm 17, the zinc oxide is prone to continuously adhering to the friction arm 17. This not only easily leads to deviations in the overall propulsion system, but also, after being continuously heated and dried, the adhered zinc oxide will form clumps and physically adhere to the outside of the friction arm 17, affecting the normal operation of the equipment. By opening an air outlet structure at the bottom of the friction arm 17, during the rotation of the friction arm 17, the temperature control valve 6 can divert part of the steam originally injected into the drying tray 9 into all the series pipes 16. The steam will be ejected from the air outlet structure at the bottom of the friction arm 17, thus forming an airflow barrier at the bottom of the friction arm 17. The zinc oxide is propelled by the airflow barrier, which can reduce the deformation of parts caused by the physical friction between the friction arm 17 and the drying tray 9, thus reducing the impact on the service life of the equipment. Furthermore, by controlling the output of the temperature control valve 6, the frequency of the airflow delivered to the series pipes 16 is modified to be intermittent. When the airflow is delivered, due to friction... The air outlet structure of arm 17 is located at the bottom. Under the reverse thrust of the airflow, friction arm 17 will move upward. The rotation of friction arm 17 is restricted. When rotating upward, it can only rotate to a horizontal position. At this time, zinc oxide is transferred by airflow. When the airflow stops, friction arm 17 rotates under the action of gravity, and the end sinks. The end of friction arm 17 will stick to the surface of drying tray 9, but the contact area is small. At this time, zinc oxide is transported by its own friction. Through this dual transportation of zinc oxide, the problem of part deformation caused by long-term friction of friction arm 17 against drying tray 9 can be reduced. At the same time, the problem of large zinc oxide particles not being able to be pushed by the airflow due to insufficient airflow force can also be eliminated. In addition, due to the continuous swinging state of friction arm 17, zinc oxide adhering from the top surface can be effectively removed, keeping friction arm 17 clean. This will not affect the orderly spiral pushing method of the equipment, and will not cause zinc oxide to dry and clump on friction arm 17, making the operation of the equipment more stable and reliable.

[0023] Both sides of the friction arm 17 are equipped with docking valves 20. Two different types of adapter handles 25 are provided on the outer side of the friction arm 17. The adapter handles 25 are bent and connected to the friction arm 17 through the docking valves 20. The bottom of the adapter handles 25 can spray airflow. During operation, in order to improve the reliability and economy of the equipment, the friction arm 17 is raised as a whole, and the air outlet structure at the bottom of the friction arm 17 is transferred to the adapter handle 25. Originally, the friction arms 17 used on each drying tray 9 had different tilt directions. To facilitate production, all friction arms 17 can be standardized first. By installing different adapter handles 25 on different sides of each friction arm 17, the required claw rake 10 can be assembled later. This not only reduces the production difficulty, but also allows for individual replacement when a single adapter handle 25 has a problem, thus maintaining the long-term effective operation of the equipment. In addition, the bent adapter handle 25 at the end can better push the zinc oxide to move, ensuring the layer-by-layer transfer effect of zinc oxide.

[0024] The friction arm 17 is hollow inside and is divided into upper and lower sections. The two sections of the friction arm 17 are pressed together and connected. The end of the friction arm 17 away from the docking valve 20 is bifurcated, and each bifurcated end of the friction arm 17 is provided with an adapter hole 21. The outer side of the series pipe 16 is rotatably connected to multiple sets of rotating rings 24 corresponding to the adapter holes 21. During operation, in order to facilitate the replacement of friction arm 17, friction arm 17 is modified into two sections, upper and lower, and the position of adapter hole 21 is connected with rotating ring 24 by pressing, so as to facilitate the disassembly and assembly of the two; the surface of rotating ring 24 has holes for transmitting airflow.

[0025] The bottom of the adapter handle 25 is equipped with two different structures, namely an airflow pipe 23 and an ejector arm 22. The bottom of the airflow pipe 23 is provided with multiple air jet holes, and the ejector arm 22 is slidably engaged with the adapter handle 25. During operation, to further enhance the equipment's capabilities, the multiple rakes 10 on each drying tray 9 employ different adapter handles 25. For example, all adapter handles 25 on the first rake 10 have an airflow pipe 23 mounted at the bottom, while all adapter handles 25 on the second rake 10 have an ejector arm 22 mounted at the bottom. The difference between these two structures is that the airflow pipe 23 is further spaced from the drying tray 9, and air can exit from the bottom. The zinc oxide is primarily driven by airflow, and it also features an intermittent oscillation effect controlled by the airflow. The ejector arm... Under the action of airflow, the ejector arm 22 will be pushed downwards, mainly relying on friction to move the zinc oxide. At the same time, when the airflow stops, the friction arm 17 and the adapter handle 25 connected to it will be pressed downwards by gravity to make the ejector arm 22 retract. This can remove residual zinc oxide from the surface of the ejector arm 22 through friction, which can more effectively clean the surface. The adapter handles 25 with different structures are arranged on different claws 10 in sequence, which can effectively transport viscous, fine, and blocky zinc oxide, greatly reducing the problem of zinc oxide staying in one place and repeatedly drying, thus ensuring the quality of the finished product.

[0026] The bottom edge of the ejector arm 22 is smoothly transitioned, and a small hole is provided at the bottom of the ejector arm 22. A spring is fixed between the ejector arm 22 and the adapter handle 25. During operation, the small hole at the bottom of the ejector arm 22 will spray a fine airflow downwards when the ejector arm 22 is ejected, which will form an air film at the bottom. However, because the opening is small, the ejector arm 22 will still forcefully push downwards. In this way, the ejector arm 22 will not rub violently against the drying tray 9, while it can also forcefully push the zinc oxide. The spring is used to assist the ejector arm 22 in retraction.

[0027] A support pipe is fixedly connected to the bottom perimeter of the drying tray 9 and the drying tank 1. A regulating valve 5 is fixedly connected to the top of the temperature control valve 6 and the reflux valve 7. A connecting pipe 15 is fixedly connected between the regulating valve 5 and the bottom of the drying tray 9. During operation, the support pipe and the connecting pipe 15 are used to keep the drying tray 9 stable, while the regulating valve 5 is used to ensure that the input airflow is evenly delivered to the drying tray 9 through the connecting pipe 15, so as to ensure that the surface temperature of the drying tray 9 is suitable.

[0028] A drive motor 12 is fixedly connected to the bottom of the drying tank 1, and a transmission shaft 26 is fixedly connected to the top output end of the drive motor 12. The transmission shaft 26 passes through the center hole 18 of all the drying trays 9 and is connected to all the series pipes 16. A rotating shaft 11 is fixedly connected to the bottom of the drying tank 1, and the temperature control valve 6 is connected to the rotating shaft 11 through the heat transfer pipe 27. During operation, the drive motor 12 controls the rotation of the transmission shaft 26, which in turn drives all the claw rakes 10 to rotate in the same direction, ensuring the smooth operation of the spiral transport of zinc oxide. Each drying tray 9 has a central hole 18 in the middle, through which the transmission shaft 26 can pass smoothly. At the same time, the transmission shaft 26 is a rotary joint for the gas circuit, ensuring that steam is delivered to the hollow part of the transmission shaft 26 while it is rotating, thus ensuring that the airflow is transmitted to the friction arm 17.

[0029] An overflow hole is also provided at the top of the rotating shaft 11. A dispersing platform 14 is fixedly connected inside the packing tube 2. The top of the dispersing platform 14 is set with a sharp angle. A cover 13 is fixedly connected to the bottom of the dispersing platform 14. The bottom of the cover 13 is in contact with the top surface of the uppermost drying tray 9. During operation, the bottom of the rotating shaft 11 can also be connected to the overflow hole, allowing the dry airflow to be introduced from bottom to top. This guides the internal moisture to move upward and eventually be discharged from the exhaust pipe 3. The dispersing platform 14 in the packing pipe 2 can break the added zinc oxide and allow it to fall from around the cover 13 into the uppermost drying tray 9. The cover 13 is used to block the central hole 18 at the top of the drying tray 9 to ensure the smooth progress of the feeding process.

[0030] A drying method for zinc oxide production, applicable to the aforementioned zinc oxide drying equipment, comprising the following specific steps: S1: The zinc oxide to be dried is put into the drying tank 1 through the packing tube 2. The zinc oxide particles will fall into the middle of the uppermost drying tray 9. As the claw rake 10 rotates continuously, the zinc oxide on the surface of the drying tray 9 is pushed in the desired direction under the action of friction. S2: Zinc oxide will transfer downwards layer by layer, eventually reaching the bottom of the drying tank 1, and falling from the discharge pipe 8 under the action of gravity. During the continuous movement of zinc oxide, high-temperature heat medium is continuously circulated in the drying tray 9, causing the moisture in the zinc oxide to evaporate and move upwards, and be discharged upwards through the exhaust pipe 3, thereby reducing the humidity inside the drying tank 1. S3: During the rotation of the claw rake 10, the zinc oxide is neatly filled into the zinc oxide. Steam will be ejected from the air outlet structure at the bottom of the friction arm 17, forming an airflow barrier at the bottom of the friction arm 17. The zinc oxide is pushed through the airflow barrier, reducing the damage to the equipment caused by direct friction. At the same time, the friction arm 17 will also swing continuously during the rotation, reducing the adhesion of zinc oxide.

[0031] The specific operation steps for the swinging of the friction arm in S3 are as follows: Q1: Modify the airflow frequency delivered to the series pipe 16 to intermittent. When the airflow is delivered, the friction arm 17 will move upward under the reverse thrust of the airflow because the air outlet structure of the friction arm 17 is located at the bottom. Q2: The rotation of the friction arm 17 is limited. When rotating upward, it can only rotate to a horizontal position. At this time, the zinc oxide is transferred by airflow. When the airflow stops, the friction arm 17 rotates under the action of gravity, and the end sinks. The end of the friction arm 17 will stick to the surface of the drying tray 9. At this time, the zinc oxide is transported by its own friction, thus forming a continuous oscillating function.

[0032] During operation, the zinc oxide to be dried is fed into the drying tank 1 through the packing tube 2. The zinc oxide particles fall into the center of the uppermost drying tray 9. As the claw rake 10 rotates continuously, the friction arms 17 on the claw rake 10 have different inclination directions depending on the different drying trays 9. If the friction arms 17 are tilted outward, they will push the zinc oxide on the surface of the drying tray 9 outward under the friction during rotation. At the same time, the positions of the friction arms 17 on different claw rakes 10 on each drying tray 9 are also different. If all the friction arms 17 are connected in a ring, they will form a spiral line that spreads outward, thus causing the zinc oxide falling from above to move outward under the rotation of multiple claw rakes 10. The zinc oxide eventually falls outwards from the edge of the topmost first drying tray 91. The second drying tray 92 below has a larger diameter than the topmost first drying tray 91 and is basically in contact with the inner wall of the drying tank 1, thus effectively receiving the zinc oxide falling from above. At the same time, the lower claw rake 10 rotates in the same direction but tilts in the opposite direction. Under the frictional rotation, it pushes the zinc oxide inward. The second drying tray 92 has a large central hole 18 in the middle, which pushes the zinc oxide to the middle position and then it falls from the central hole 18 into the lower drying tray 9. The lower drying trays 9 are, in sequence, the first drying tray 91, the second drying tray 92, the first drying tray 9, and the second drying tray 92. Repeating this, the difference between the first drying tray 91 and the second drying tray 92 is that the diameter of the first drying tray 91 is smaller than that of the second drying tray 92, while the central hole of the second drying tray 92 is larger than that of the first drying tray 91. Therefore, zinc oxide discharged from the periphery of the first drying tray 91 will be caught by the edge of the second drying tray 92; zinc oxide discharged from the center of the second drying tray 92 will fall to a more central position on the first drying tray 91, but will not fall through the central hole 18. This transfer path is then repeated, with the zinc oxide transferring downwards layer by layer until it reaches the bottom of the drying tank 1. Under the influence of gravity, it falls through the discharge pipe 8, which is located at the bottom of the drying tank 1, and the bottom of the drying tank 1 is concave. A baffle is located at the center of the unit, allowing the finished product to be discharged from multiple discharge pipes 8. Simultaneously, as the zinc oxide moves continuously, a high-temperature heat medium, which can be water vapor, continuously circulates in the drying tray 9, causing the moisture in the zinc oxide to evaporate and move upward, and be discharged upward through the exhaust pipe 3. This reduces the humidity inside the drying tank 1, allowing the equipment to carry out the drying process for a long time. Through this setting, the process of gradually drying zinc oxide is completed, and the drying process is uniform and thorough. At the same time, as the zinc oxide moves continuously, the zinc oxide particles are constantly tumbling, ensuring uniform heating and evaporation. At the same time, large zinc oxide particles are continuously dispersed to reduce their volume, making the final product easy to recycle and store. However, the zinc oxide freshly injected into the drying tank 1 has a high moisture content and is very viscous. Under the frictional propulsion of the friction arm 17, the zinc oxide is prone to continuously adhering to the friction arm 17. This not only easily leads to deviations in the overall propulsion system, but also, after being continuously heated and dried, the adhered zinc oxide will form clumps and physically adhere to the outside of the friction arm 17, affecting the normal operation of the equipment. By opening an air outlet structure at the bottom of the friction arm 17, during the rotation of the friction arm 17, the temperature control valve 6 can divert part of the steam originally injected into the drying tray 9 into all the series pipes 16. The steam will be ejected from the air outlet structure at the bottom of the friction arm 17, thus forming an airflow barrier at the bottom of the friction arm 17. The zinc oxide is propelled by the airflow barrier, which can reduce the deformation of parts caused by the physical friction between the friction arm 17 and the drying tray 9, thus reducing the impact on the service life of the equipment. Furthermore, by controlling the output of the temperature control valve 6, the frequency of the airflow delivered to the series pipes 16 is modified to be intermittent. When the airflow is delivered, due to friction... The air outlet structure of arm 17 is located at the bottom. Under the reverse thrust of the airflow, friction arm 17 will move upward. The rotation of friction arm 17 is restricted. When rotating upward, it can only rotate to a horizontal position. At this time, zinc oxide is transferred by airflow. When the airflow stops, friction arm 17 rotates under the action of gravity, and the end sinks. The end of friction arm 17 will stick to the surface of drying tray 9, but the contact area is small. At this time, zinc oxide is transported by its own friction. Through this dual transportation of zinc oxide, the problem of part deformation caused by long-term friction of friction arm 17 against drying tray 9 can be reduced. At the same time, the problem of large zinc oxide particles not being able to be pushed by the airflow due to insufficient airflow force can also be eliminated. In addition, due to the continuous swinging state of friction arm 17, zinc oxide adhering from the top surface can be effectively removed, keeping friction arm 17 clean. This will not affect the orderly spiral pushing method of the equipment, and will not cause zinc oxide to dry and clump on friction arm 17, making the operation of the equipment more stable and reliable.

[0033] To improve the reliability and economy of the equipment, the friction arm 17 is raised as a whole, and the air outlet structure at the bottom of the friction arm 17 is moved to the adapter handle 25. Originally, the friction arms 17 used on each drying tray 9 had different tilt directions. To facilitate production, all friction arms 17 can be standardized first. By installing different adapter handles 25 on different sides of each friction arm 17, the required claw rake 10 can be assembled later. This not only reduces the production difficulty, but also allows for individual replacement when a single adapter handle 25 malfunctions, thus maintaining the long-term effective operation of the equipment. Furthermore, the bent adapter handle 25 at the end can better push the zinc oxide to move, ensuring the layer-by-layer transfer effect of zinc oxide.

[0034] To facilitate the replacement of friction arm 17, friction arm 17 is modified into two sections, upper and lower, and the position of adapter hole 21 is connected with the rotating ring 24 by pressing, thereby facilitating the assembly and disassembly of the two; the rotating ring 24 has holes on its surface for transmitting airflow.

[0035] To further enhance the equipment's capabilities, the multiple rakes 10 on each drying tray 9 employ different adapter handles 25. For example, all adapter handles 25 on the first rake 10 have an airflow pipe 23 mounted at the bottom, while all adapter handles 25 on the second rake 10 have an ejector arm 22 mounted at the bottom. The difference between these two structures is that the airflow pipe 23 is more widely spaced from the drying tray 9, and air can exit from the bottom. The zinc oxide is primarily driven by airflow, while also exhibiting a swinging effect under intermittent airflow control. The ejector arm 22... Under the action of airflow, it will be pushed downwards, mainly relying on friction to move the zinc oxide. At the same time, when the airflow stops, the friction arm 17 and the adapter handle 25 connected to it will be pressed downwards by gravity to make the ejector arm 22 retract. This can remove residual zinc oxide from the surface of the ejector arm 22 through friction, which can more effectively clean the surface. The adapter handles 25 with different structures are arranged on different claws 10 in sequence, which can effectively transport viscous, fine, and blocky zinc oxide, greatly reducing the problem of zinc oxide staying in one place and repeatedly drying, thus ensuring the quality of the finished product.

[0036] The small hole at the bottom of the ejector arm 22 will spray a fine airflow downward when the ejector arm 22 is ejected, which will form an air film at the bottom. However, because the opening is small, the ejector arm 22 will still forcefully push downward. In this way, the ejector arm 22 will not rub violently against the drying tray 9, while it can also forcefully push the zinc oxide. The spring is used to assist the ejector arm 22 in retraction.

[0037] The support pipe and connecting pipe 15 are used to keep the drying tray 9 stable, while the regulating valve 5 is used to ensure that the input airflow is uniformly delivered to the drying tray 9 through the connecting pipe 15, so as to ensure that the surface temperature of the drying tray 9 is suitable.

[0038] The drive motor 12 controls the rotation of the transmission shaft 26, which in turn drives all the claw rakes 10 to rotate in the same direction, ensuring the smooth operation of the spiral transport of zinc oxide. Each drying tray 9 has a central hole 18 in the middle, through which the transmission shaft 26 can pass smoothly. At the same time, the transmission shaft 26 is a rotary joint for the gas circuit, ensuring that steam is delivered to the hollow part of the transmission shaft 26 while it is rotating, so that the airflow is transmitted to the friction arm 17.

[0039] An overflow hole can be connected from the bottom of the rotating shaft 11, allowing the dry airflow to be introduced from bottom to top. This guides the internal moisture to move upward and eventually be discharged from the exhaust pipe 3. The dispersing platform 14 in the packing pipe 2 can break up the added zinc oxide and allow it to fall from around the cover 13 into the uppermost drying tray 9. The cover 13 is used to block the central hole 18 at the top of the drying tray 9 to ensure the smooth progress of the feeding process.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A drying device for zinc oxide production, characterized in that: The device includes a drying tank with multiple observation windows fixed to its outer side and a packing tube fixed to its top. Multiple drying discs are fixed to the inside of the drying tank, each with a central hole. The drying discs are arranged vertically at equal intervals, and each disc consists of a first drying disc and a second drying disc with different structures. Multiple rotatable rakes are mounted on the top surface of each drying disc. Temperature control valves and reflux valves for transferring and recovering heat transfer medium to the drying discs are located on the outer side of the drying tank. Multiple discharge pipes are located at the bottom of the drying tank, and an exhaust pipe is fixed to one side of the top of the drying tank. Each rake includes a series pipe and multiple friction arms that can rotate on the series pipe. The bottom of each friction arm can spray airflow. The temperature control valve is connected to the series pipe.

2. The drying equipment for zinc oxide production according to claim 1, characterized in that: Both sides of the friction arm are equipped with docking valves. Two different types of adapter handles are provided on the outer side of the friction arm. The adapter handles are bent and connected to the friction arm through the docking valves. The bottom of the adapter handles can spray airflow.

3. The drying equipment for zinc oxide production according to claim 2, characterized in that: The friction arm is hollow inside and is divided into upper and lower sections. The two sections of the friction arm are pressed together and connected. The end of the friction arm away from the docking valve is forked, and each forked end of the friction arm is provided with an adapter hole. The outer side of the series tube is rotatably connected to multiple sets of rotating rings corresponding to the adapter holes.

4. The drying equipment for zinc oxide production according to claim 3, characterized in that: The bottom of the adapter handle has two different structures: an airflow tube and an ejector arm. The bottom of the airflow tube has multiple air jet holes, and the ejector arm is slidably engaged with the adapter handle.

5. A drying device for zinc oxide production according to claim 4, characterized in that: The bottom edge of the ejector arm is smoothly rounded, and a small hole is provided at the bottom of the ejector arm. A spring is fixed between the ejector arm and the adapter handle.

6. The drying equipment for zinc oxide production according to claim 5, characterized in that: A support pipe is fixedly connected to the bottom of the drying tray and the drying tank. A regulating valve is fixedly connected to the top of both the temperature control valve and the reflux valve. A connecting pipe is fixedly connected between the regulating valve and the bottom of the drying tray.

7. A drying device for zinc oxide production according to claim 6, characterized in that: A drive motor is fixedly connected to the bottom of the drying tank, and a transmission shaft is fixedly connected to the top output end of the drive motor. The transmission shaft passes through the center hole of all the drying trays and is connected to all the series pipes. A rotating shaft is fixedly connected to the bottom of the drying tank, and the temperature control valve is connected to the rotating shaft through a heat transfer pipe.

8. A drying apparatus for zinc oxide production according to claim 7, characterized in that: An overflow hole is provided at the top of the rotating shaft. A dispersing platform is fixedly connected inside the packing tube. The top of the dispersing platform is set with a sharp angle. A cover is fixedly connected to the bottom of the dispersing platform. The bottom of the cover is in contact with the top surface of the uppermost drying tray.

9. A drying method for zinc oxide production, the method being applicable to the drying equipment for zinc oxide production as described in any one of claims 1-8, characterized in that: The specific steps of this method are as follows: S1: The zinc oxide to be dried is put into the drying tank through the packing tube. The zinc oxide particles will fall into the middle of the uppermost drying tray. As the claw rake rotates continuously, the zinc oxide on the surface of the drying tray is pushed in the desired direction under the action of friction. S2: Zinc oxide will transfer downwards layer by layer, eventually reaching the bottom of the drying tank, and fall from the discharge pipe under the action of gravity. During the continuous movement of zinc oxide, high-temperature heat medium is continuously circulated in the drying tray, causing the moisture in the zinc oxide to evaporate and move upwards, and be discharged upwards through the exhaust pipe, thereby reducing the humidity inside the drying tank. S3: As the claw rake rotates and pushes the zinc oxide, it fills the zinc oxide neatly. Steam is ejected from the air outlet structure at the bottom of the friction arm, forming an airflow barrier at the bottom of the friction arm. The airflow barrier pushes the zinc oxide, reducing the damage to the equipment caused by direct friction. At the same time, the friction arm will also swing continuously during the rotation, reducing the adhesion of zinc oxide.

10. A drying method for producing zinc oxide according to claim 9, characterized in that: The specific operation steps for the swinging of the friction arm in S3 are as follows: Q1: Modify the frequency of the airflow delivered to the series pipe to intermittent. When the airflow is delivered, the friction arm will move upward under the reverse thrust of the airflow because the air outlet structure of the friction arm is located at the bottom. Q2: The rotation of the friction arm is limited. When rotating upward, it can only rotate to a horizontal position. At this time, the zinc oxide is transferred by airflow. When the airflow stops, the friction arm rotates under the action of gravity, and the end sinks. The end of the friction arm will stick to the surface of the drying tray. At this time, the zinc oxide is transported by its own friction, thus forming a continuous oscillating function.

Images