Contact type drying machine and drying method

Abstract

The invention relates to the technical field of garbage treatment, and discloses a contact type drying machine and a drying method.The contact type drying machine comprises a drying machine body which is provided with a shell used for containing materials and providing a drying space, and the shell is of a combined structure; the driving mechanism is arranged on the outer side of the drying machine body and used for providing power output of the stepping feeding mechanism; the air guide mechanism is arranged at the end part of the drying machine body and forms a one-way air path to realize air inlet or air outlet so as to provide an airflow condition for material drying; the stepping feeding mechanisms are arranged in the drying machine body, the number of the stepping feeding mechanisms is at least two, the stepping feeding mechanisms are distributed in an up-down staggered mode in the longitudinal direction of the drying machine body and used for conveying materials to be dried in a layered mode, and the stepping feeding mechanisms are driven by a driving mechanism and drive the materials to move under the action of the driving mechanism; and the spiral discharging end is matched with the drying machine body and is used for outputting the layered and dried materials.

Description

A contact dryer and drying method Technical Field

[0001] This application relates to the field of waste treatment technology, and in particular to a contact dryer and drying method. Background Technology

[0002] In the waste treatment process, drying is an important pretreatment step, aiming to reduce the moisture content of waste and facilitate subsequent processes such as incineration, landfill, and resource utilization. Currently, there are many types of waste drying equipment on the market, but they generally suffer from problems such as low drying efficiency, uneven material drying, complex equipment structure and inconvenient maintenance, and easy accumulation and blockage during material transportation.

[0003] Some drying equipment uses a single-layer conveyor drying structure, resulting in a short residence time of materials in the drying chamber and insufficient moisture removal. While some equipment employs a multi-layer conveyor structure, the material conveying between layers is not smoothly connected, and the air guide structure is poorly designed, preventing sufficient contact between airflow and materials, leading to poor drying results. Furthermore, traditional drying equipment often has a one-piece casing, making disassembly and maintenance difficult when internal malfunctions occur or cleaning is required, thus affecting the continuous operating efficiency of the equipment.

[0004] Therefore, there is an urgent need for a waste drying equipment and corresponding drying method with optimized structure, high drying efficiency, and convenient maintenance to address the shortcomings of existing technologies. Summary of the Invention

[0005] To address the aforementioned problems, this application provides a contact dryer and a drying method.

[0006] This application provides a contact dryer and drying method using the following technical solution: Firstly, a contact dryer includes a dryer body with a shell for containing materials and providing a drying space, the shell being a modular structure; a drive mechanism disposed on the outside of the dryer body for providing power output to a stepping feeding mechanism; an air guide mechanism disposed at the end of the dryer body to form a unidirectional airflow path for air intake or exhaust, providing airflow conditions for material drying; a stepping feeding mechanism disposed within the dryer body, with at least two arranged longitudinally along the dryer body and staggered vertically, for layered conveying of the material to be dried, the stepping feeding mechanism being driven by the drive mechanism, causing the material to move under the action of the drive mechanism; and a spiral discharge end cooperating with the dryer body for outputting the material after layered drying.

[0007] Furthermore, it also includes: a material leveling mechanism, which is located on one side of the material input position inside the dryer body, driving the material to move and spread it evenly on the stepping feeding mechanism; the material leveling mechanism includes: a material leveling motor fixed to the outside of the dryer body and extending its input end into the dryer body, a material leveling roller shaft that is drivenly connected to the output end of the material leveling motor, and a raised strip frame provided on the outside of the material leveling roller shaft, with a plurality of raised strip frames distributed at equal angles along the circumference of the material leveling roller shaft, and the raised strip frames engaging with the material leveling roller shaft.

[0008] Furthermore, the housing is provided with a feed inlet, a support structure, and a cleaning structure; the support structure is a support leg, which is located below the housing; the cleaning structure is a cleaning window, which is arranged in a rectangular array at the front and rear ends of the housing, and there are several cleaning windows; the feed inlet is located on one side above the housing.

[0009] Furthermore, the air guiding mechanism is provided in two sets, located at both ends of the dryer body, and is a switchable air inlet and air outlet. The air guiding mechanism includes a main air duct, a connecting air duct, a guide connecting pipe, and a drying connecting pipe. The main air duct is used to connect to the fan. The connecting air duct is located at the end of the main air duct away from the fan, and the diameter of the main air duct gradually decreases towards the connecting air duct. The guide connecting pipe is located on the side of the connecting air duct closer to the dryer body. The drying connecting pipe is fixed to the outside of the dryer body and communicates with the inside of the dryer body, providing an installation and connection area for the guide connecting pipe. The main air duct, connecting air duct, guide connecting pipe, and drying connecting pipe are sequentially and sealed together to form a unidirectional air path that runs through the inside of the dryer body.

[0010] Furthermore, the drive mechanism includes: a fixed support platform fixed to the outside of the dryer body and screwed to the dryer body; a telescopic member mounted on the fixed support platform, with at least two telescopic members forming a group; and a drive connection end disposed at the end of the telescopic member away from the fixed support platform.

[0011] Furthermore, the stepping feeding mechanism includes: a plurality of feeding frames forming a group, the plurality of feeding frames being equally distributed along the minor diameter direction of the dryer body; the two support frames forming a group, and at least four sets of support frames being provided at the bottom of the feeding frame; multiple sets of stepping linkage frames located at the lower end of the feeding frame, the stepping linkage frames being driven by telescopic components; an extension portion being provided above the stepping linkage frame, the extension portion extending to the top of the feeding frame through the gap between adjacent feeding frames; and a conveying protrusion frame located above the feeding frame and connected to the extension portion of the stepping linkage frame.

[0012] Furthermore, the conveying protrusion is configured as a triangular protrusion with an arc-shaped chamfer at the protrusion position. Several conveying protrusions are arranged along the feeding frame to form a group. At least two groups of conveying protrusions are arranged above a single feeding frame, and the two groups of conveying protrusions are connected by different groups of stepping linkage frames.

[0013] Furthermore, multiple sets of the stepping linkage frames are staggered along the long axis of the feeding frame, and different sets of stepping linkage frames are connected by telescopic components, driving the conveying protrusion frames at different positions to reciprocate, thereby conveying materials.

[0014] Secondly, a drying method for a contact dryer is proposed, including the following steps: S1, the waste material to be dried is fed into the dryer body through the feed port on the shell, and the material falls into the material input position side of the dryer body; S2, the air guide mechanism forms a unidirectional air path at the end of the dryer body, continuously introducing or discharging airflow to provide stable airflow conditions for material drying. Each group of air guide mechanisms corresponds to a different layer of step feeding mechanism, independently providing airflow for the corresponding layer of material; S3, the drive mechanism is started, which drives the step feeding mechanism to run. At least two step feeding mechanisms that are staggered vertically along the longitudinal direction of the dryer body work synchronously. The step linkage frame drives the conveying protrusion frame to reciprocate under the drive of the telescopic component, thereby driving the material to move along the feeding frame to achieve layered conveying of the material; during the conveying process on each layer of step feeding mechanism, the material is in full contact with the airflow to complete the layered drying; S4, material discharge: the material after layered drying enters the screw discharge end under the continuous conveying of the step feeding mechanism, and is discharged from the dryer body through the screw discharge end, completing the entire drying process.

[0015] Furthermore, a material leveling step is added before S2. The material leveling mechanism is started, and the material leveling motor starts working, driving the material leveling roller shaft connected to its output end to rotate. The raised strips on the outside of the material leveling roller shaft rotate synchronously with the roller shaft. The raised strips drive the material to move in the opposite direction along the conveying direction, spreading the accumulated material evenly onto the stepping feeding mechanism below, so that the material is evenly distributed, avoiding local accumulation, and ensuring that the material can fully contact the subsequent airflow.

[0016] In summary, this application includes the following beneficial technical effects: the modular housing design facilitates equipment disassembly, installation, and maintenance; and the rectangular array of cleaning windows enables rapid cleaning of the equipment's interior, preventing material residue buildup and improving equipment operational stability.

[0017] A material leveling mechanism is added, which, through the cooperation of the leveling roller and the raised strip, spreads the material evenly onto the stepping feeding mechanism, avoiding local accumulation of material, ensuring full contact between the material and the airflow, and improving the uniformity of drying.

[0018] The stepping feeding mechanism adopts a multi-layered staggered distribution design, combined with multiple sets of staggered stepping linkage frames and conveying protrusion frames, to achieve continuous layered conveying of materials, extend the residence time of materials in the drying chamber, and avoid conveying jams.

[0019] The air guiding mechanism and the stepping feeding mechanism are layered and correspond one-to-one, and the number of guide connecting pipes can be flexibly adjusted to achieve precise air delivery to each layer of material, ensuring that the material is fully dried and improving drying efficiency. Attached Figure Description

[0020] Figure 1 is a perspective view of a contact dryer according to the present invention.

[0021] Figure 2 is a schematic diagram of the air guiding mechanism of the present invention.

[0022] Figure 3 is a cross-sectional view of a contact dryer according to the present invention.

[0023] Figure 4 is a bottom view of the stepping feeding mechanism of the present invention.

[0024] Figure 5 is a bottom view of the step drive mechanism of the present invention.

[0025] Figure 6 is a schematic diagram of the material leveling mechanism in Embodiment 2 of the present invention.

[0026] Figure 7 is a schematic diagram of the principle of Embodiment 3 of the present invention.

[0027] Explanation of reference numerals in the attached drawings: 1. Dryer body; 2. Drive mechanism; 3. Air guide mechanism; 4. Stepping feeding mechanism; 5. Spiral discharge end; 6. Material leveling mechanism; 11. Shell; 12. Feed inlet; 13. Support leg; 14. Cleaning window; 21. Fixed support platform; 22. Telescopic component; 23. Drive connection end; 31. Main air duct; 32. Connecting air duct; 33. Guide connecting pipe; 34. Drying connecting pipe; 41. Feeding rack; 42. Support frame; 43. Stepping linkage frame; 44. Conveying protrusion frame; 61. Material leveling motor; 62. Material leveling roller shaft. Detailed Implementation

[0028] The present application will be further described in detail below with reference to Figures 1-6.

[0029] Example 1 This example first proposes a contact dryer, as shown in Figures 1 to 3, including a dryer body 1, a drive mechanism 2, an air guide mechanism 3, a stepping feeding mechanism 4, and a spiral discharge end 5. The components work together to achieve efficient layered drying and conveying of waste.

[0030] As shown in Figure 1, the dryer body 1, as the core load-bearing component of the equipment, has a shell 11 for accommodating materials and providing a drying space. The shell 11 is a modular structure, which, compared to an integral structure, is easier to disassemble, install, and maintain. The specifications of the shell 11 can be flexibly adjusted according to actual drying needs, and it also facilitates thorough cleaning of the inner wall of the shell 11, preventing material residue accumulation. The shell 11 is also equipped with a feed inlet 12, a support structure, and a cleaning structure. The support structure consists of support legs 13, which are located below the shell 11 to stably support the entire dryer body 1 and ensure the stability of the equipment during operation. The cleaning structure consists of cleaning windows 14, which are arranged in a rectangular array at the front and rear ends of the shell 11, and there are several of them. Operators can use the cleaning windows 14 to clean and maintain the stepping feeding mechanism 4 inside the dryer body 1 in real time, which is convenient. The feed inlet 12 is located on one side of the upper part of the shell 11 and is used to transport the waste material to be dried into the dryer body 1.

[0031] As shown in Figure 1, the drive mechanism 2 is located on the outside of the dryer body 1, providing stable power output to the stepping feeding mechanism 4 and ensuring that the stepping feeding mechanism 4 can drive the material movement normally. Specifically, the drive mechanism 2 includes a fixed support platform 21, a telescopic component 22, and a drive connection end 23. The fixed support platform 21 is fixed to the outside of the dryer body 1 and screwed to the dryer body 1, making the connection firm and easy to disassemble. The telescopic component 22 is mounted on the fixed support platform 21, with at least two telescopic components 22 forming a group, preferably three. Through the coordinated work of multiple groups of telescopic components 22, the stability and uniformity of the power output are ensured. The drive connection end 23 is located at the end of the telescopic component 22 away from the fixed support platform 21 and is used to connect with the stepping feeding mechanism 4, transmitting the power of the telescopic component 22 to the stepping feeding mechanism 4.

[0032] As shown in Figures 1 and 2, the air guide mechanism 3 is located at the end of the dryer body 1, forming a unidirectional airflow path to achieve air inlet or outlet, providing airflow conditions for material drying. Specifically, there are two sets of air guide mechanisms 3, located at both ends of the dryer body 1, and they are switchable air inlet and outlet ends, respectively. The direction of air inlet and outlet can be selected according to actual drying needs, improving the adaptability of the equipment. The air guiding mechanism 3 includes a main air duct 31, a connecting air duct 32, a guide connecting pipe 33, and a drying connecting pipe 34. The main air duct 31 is used to connect to the fan and provide the source of airflow. The connecting air duct 32 is located at the end of the main air duct 31 away from the fan, and the radial direction of the main air duct 31 gradually narrows towards the connecting air duct 32, which enables the airflow to gradually converge during the conveying process, improving the wind speed and airflow stability. The guide connecting pipe 33 is located on the side of the connecting air duct 32 close to the dryer body 1. The drying connecting pipe 34 is fixed to the outside of the dryer body 1, providing an installation and connection area for the guide connecting pipe 33. The main air duct 31, the connecting air duct 32, the guide connecting pipe 33, and the drying connecting pipe 34 cooperate in sequence to form a unidirectional airflow path, ensuring that the airflow can enter the interior of the dryer body 1 in a directional and stable manner and come into contact with the material.

[0033] In actual use, one end of the main air duct 31 is fixedly connected to the air outlet of the fan. The drying airflow generated by the fan first enters the main air duct 31. The diameter of the main air duct 31 gradually decreases in the direction of the connecting air duct 32 (the diameter of the main air duct 31 gradually changes from 600mm to 300mm). When the airflow flows through the connecting air duct 32, it converges due to the reduced cross-section, and the wind speed increases to 15-18m / s, which enhances the penetration of the airflow. The guide connecting pipe 33 is connected to the inside of the dryer body 1 through the drying connecting pipe 34. The airflow is blown to the material surface of the corresponding layer through the outlet of the guide connecting pipe 33, forming an air curtain covering the entire material layer. The two sets of air guiding mechanisms 3 serve as the air inlet and air outlet respectively. After the airflow passes through the material layer, it is discharged by the air outlet guide mechanism 3, forming a unidirectional airflow path of air inlet, material passage, and exhaust, ensuring that moisture is continuously removed.

[0034] In a further embodiment, the number of guide connecting pipes 33 and drying connecting pipes 34 is set according to the predetermined drying requirements, and multiple sets of air guiding mechanisms 3 are set from top to bottom according to the number of step feeding mechanisms 4, so that the material corresponding to each set of step feeding mechanisms 4 can obtain precise airflow supply, ensuring that the material in each layer is dried evenly, and the air guiding mechanisms 3 at the air inlet and air outlet are staggered to avoid the material being blown out when they are on the same horizontal line.

[0035] As shown in Figures 4 and 5, the stepping feeding mechanism 4 is located inside the dryer body 1 and is the core component for achieving layered material conveying. At least two are arranged along the longitudinal direction of the dryer body 1; in this embodiment, three are arranged in a staggered vertical distribution. Driven by the drive mechanism 2, the mechanism moves the material, achieving layered conveying and gradual drying, extending the residence time of the material in the drying chamber, and improving the drying effect. Specifically, the stepping feeding mechanism 4 includes a feeding frame 41, a support frame 42, a stepping linkage frame 43, and a conveying protrusion frame 44. Several feeding frames 41 form a group, and these feeding frames 41 are evenly distributed along the minor axis of the dryer body 1 to support the material to be dried. The support frame 42 is located at the bottom of the feeding frame 41 and is used to combine several feeding frames 41 into a whole, enhancing the structural stability of the feeding frame 41. Two support frames 42 form a group, and at least four groups of support frames 42 are arranged at the bottom of the feeding frame 41. This further enhances the load-bearing capacity; multiple sets of stepping linkage frames 43 are provided, located at the lower end of the feeding frame 41, and driven by the telescopic component 22 of the drive mechanism 2. An extension portion is provided above the stepping linkage frame 43, which extends to the top of the feeding frame 41 through the gap between adjacent feeding frames 41, and is used to connect the conveying protrusion frame 44; the conveying protrusion frame 44 is located above the feeding frame 41 and is connected to the extension portion of the stepping linkage frame 43. It reciprocates under the drive of the stepping linkage frame 43, thereby driving the material to move along the feeding frame 41.

[0036] In the above embodiments, further as shown in Figure 3, the conveying protrusion 44 is configured as a triangular protrusion with an arc-shaped chamfer at the protrusion position. This ensures stable movement of the material and prevents material accumulation at the protrusion, while also reducing wear on the conveying protrusion 44. Several conveying protrusions 44 are arranged along the feeding frame 41 to form a group. At least two groups of conveying protrusions 44 are arranged above a single feeding frame 41. The two groups of conveying protrusions 44 are connected by different groups of stepping linkage frames 43. Through the alternating movement of the two groups of conveying protrusions 44, continuous stepping conveying of materials is achieved, avoiding the problem of conveying jams. In addition, multiple groups of stepping linkage frames 43 are staggered along the long axis of the feeding frame 41. Different groups of stepping linkage frames 43 are connected by telescopic components 22, driving the conveying protrusions 44 at different positions to reciprocate, further improving the continuity and stability of material conveying.

[0037] The spiral discharge end 5 works in conjunction with the dryer body 1 to output the material after stratified drying. The spiral discharge end 5 adopts a spiral conveying structure, which can realize the stable and continuous output of the material and avoid the material from being blocked at the discharge port. At the same time, the discharge speed can be adjusted according to the drying requirements to match the feeding speed and drying speed.

[0038] Based on the above-mentioned contact dryer, the present invention also provides a corresponding drying method, which can achieve efficient and uniform drying of waste materials. The specific steps are as follows: S1, the waste material to be dried is fed into the dryer body 1 through the feed port 12 on the shell 11. The material falls into one side of the material input position inside the dryer body 1 and waits for uniform material processing.

[0039] S2, the air guide mechanism 3 forms a unidirectional air path at the end of the dryer body 1, continuously introducing or discharging airflow to provide stable airflow conditions for material drying; wherein, the number of guide connecting pipes 33 of the air guide mechanism 3 is adapted to the predetermined drying requirements such as the humidity and total amount of the waste to be dried, and multiple sets of air guide mechanisms 3 are set from top to bottom corresponding to the number of layers of the stepping feeding mechanism 4, and each set of air guide mechanisms 3 works independently to achieve precise air delivery and drying of materials in each layer, ensuring that materials in each layer are dried evenly.

[0040] S3. Start the drive mechanism 2. The telescopic component 22 of the drive mechanism 2 drives the stepping feeding mechanism 4 to run through the drive connection end 23. At least two stepping feeding mechanisms 4, which are staggered vertically along the dryer body 1, work synchronously. The stepping linkage frame 43 drives the conveying protrusion frame 44 to reciprocate under the drive of the telescopic component 22, thereby driving the material to move along the feeding frame 41 to realize the layered conveying of the material. During the conveying process on each layer of the stepping feeding mechanism 4, the material comes into full contact with the airflow provided by the air guide mechanism 3, gradually evaporating the surface moisture and completing the layered drying. During this process, multiple sets of stepping linkage frames 43 are staggered along the long axis of the feeding frame 41, driving different sets of conveying protrusion frames 44 to move alternately, ensuring continuous material conveying, extending the residence time of the material in the dryer body 1, and improving the drying effect.

[0041] S4. After being dried in layers, the material enters the screw discharge end 5 under the continuous conveying of the stepping feeding mechanism 4, and is smoothly and continuously discharged from the dryer body 1 through the screw discharge end 5, thus completing the entire drying process.

[0042] In Example 2, based on Example 1, in order to further improve the uniformity of material distribution, without changing other technical features, as shown in Figure 6, a material leveling mechanism 6 is added to one side of the material input position inside the dryer body 1. The material leveling mechanism 6 is an added component used to drive the material to move and spread it evenly on the stepping feeding mechanism 4, so as to avoid local accumulation of material, ensure that the material is in full contact with the airflow, and improve the drying uniformity. Specifically, the material leveling mechanism 6 includes a material leveling motor 61, a material leveling roller shaft 62, and raised strips. The material leveling motor 61 is fixed outside the dryer body 1, and its input end extends into the dryer body 1 to provide power for material leveling. The material leveling roller shaft 62 is connected to the output end of the material leveling motor 61 and rotates under the drive of the material leveling motor 61. A raised strip is provided outside the material leveling roller shaft 62. Several raised strips are distributed at equal angles along the circumference of the material leveling roller shaft 62, and the raised strips are engaged with the material leveling roller shaft 62 to facilitate the disassembly, replacement, and cleaning of the raised strips. The raised strips rotate with the material leveling roller shaft 62, driving the material to move and spreading the accumulated material evenly onto the stepping feeding mechanism 4, so that the material thickness is uniform.

[0043] During the actual drying process, the material leveling mechanism 6 is started, and the material leveling motor 61 starts working, driving the material leveling roller shaft 62 connected to its output end to rotate. The raised strips on the outside of the material leveling roller shaft 62 rotate synchronously with the roller shaft. The raised strips drive the material to move in the opposite direction along the conveying direction, spreading the accumulated material evenly onto the stepping feeding mechanism 4 below, so that the material is evenly distributed, avoiding local accumulation, and ensuring that the material can fully contact the subsequent airflow.

[0044] Example 3 is based on Examples 1 and 2, and combined with the actual drying requirements of the waste material. As shown in Figure 7, the drying process is as follows: the hot air supply in the drying process adopts the kiln tail hot air, and the hot air temperature is adjusted to 120-180℃ (160-180℃ if the initial humidity of the waste to be dried is high, and 120-150℃ if the humidity is low), and the air volume is adjusted to a stable value that matches the volume of the dryer body 1; the kiln tail hot air is transported to the air inlet of the air guide mechanism 3 through the hot air duct of the blower, and the hot air duct and air guide mechanism 3 are preheated at the same time.

[0045] After the kiln tail hot air system reaches the preparatory standard, the waste material to be dried is conveyed to the feed port 12 on the shell 11 of the dryer body 1 by the scraper conveyor and enters the dryer body 1. The material falls into the side of the uniform material mechanism 6, which is adapted to the subsequent uniform material, drying and discharge speed to avoid large pieces of debris from being mixed in.

[0046] The material leveling mechanism 6 is started, and the material leveling motor 61 drives the material leveling roller shaft 62 to rotate. The raised strips on the outside of the material leveling roller shaft 62 rotate synchronously with the roller shaft, causing the material to move in the opposite direction along the conveying direction. The accumulated material is spread evenly on the stepping feeding mechanism 4 below, and the thickness of the material is controlled at 5-8cm to ensure that the material is evenly distributed and avoid local accumulation. This lays the foundation for full contact with the kiln tail hot air and uniform drying. During the material leveling process, the supply of kiln tail hot air is kept stable.

[0047] The air guide mechanism 3 receives the hot air supplied by the kiln tail hot air supply system and delivers it to the air guide mechanism 3 through the blower. It forms a unidirectional air path at the end of the dryer body 1, and evenly introduces the kiln tail hot air into the interior of the dryer body 1. The air guide mechanism 3 corresponds one-to-one with the number of layers of the stepping feeding mechanism 4 from top to bottom. Each set of air guide mechanisms 3 works independently, accurately delivering the kiln tail hot air to the top of each layer of stepping feeding mechanism 4, ensuring that the hot air evenly covers all materials, and at the same time completing the preheating of the drying chamber, further improving the drying efficiency.

[0048] Layered conveying and hot air drying circulation; the drive mechanism 2 is started, and the telescopic part 22 of the drive mechanism 2 drives the stepping feeding mechanism 4 to run through the drive connection end 23. The stepping feeding mechanism 4, which is staggered vertically along the longitudinal direction of the dryer body 1, works synchronously; the stepping linkage frame 43 drives the conveying protrusion frame 44 to reciprocate under the drive of the telescopic part 22, thereby driving the material to move along the feeding frame 41, realizing the layered material conveying as required in the figure; during the material conveying on each layer of the stepping feeding mechanism 4, it comes into full contact with the kiln tail hot air introduced by the air guide mechanism 3, and the kiln tail hot air is held according to the hot air circulation path. The material continues to carry away the moisture evaporated from its surface and interior, completing the layered drying process. During this process, multiple sets of stepping linkage frames 43 are staggered along the long axis of the feeding frame 41, driving different sets of conveying protrusion frames 44 to move alternately, ensuring continuous material conveying, extending the residence time of the material in the dryer body 1, and ensuring thorough drying. At the same time, the humid and hot air after absorbing moisture is discharged through the air guide mechanism 3 at the other end of the dryer body 1. After being discharged, it is discharged into the atmosphere through the spray dust removal system and the induced draft fan. It is worth noting that the spray dust removal system and the induced draft fan can use existing processing equipment.

[0049] After being dried in layers, the material is continuously conveyed by the stepping feeding mechanism 4 and enters the screw discharge end 5 according to the discharge path. The drive motor of the screw discharge end 5 is started, and the motor drives the screw blades to rotate. The dryer body 1 is smoothly and continuously output through the screw discharge end 5 and finally output through the conveyor, completing the discharge stage of the entire drying process.

[0050] After the drying process is completed, first shut down the kiln tail hot air supply system and stop the hot air delivery. Then, shut down the drive mechanism 2, the air guide mechanism 3, the material leveling mechanism 6, and the spiral discharge end 5 in sequence. After the dryer body 1 and the hot air pipeline have cooled to room temperature, open the cleaning window 14 on the shell 11 and clean the stepping feeding mechanism 4, the material leveling mechanism 6, the inner wall of the shell 11, and the hot air pipeline interface to remove material residue and prevent residual material from clumping and affecting the next drying effect and the smoothness of hot air delivery.

[0051] Finally, several points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly, and can refer to mechanical or electrical connections, or internal connections between two components, or direct connections. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may change. Second, the accompanying drawings of the embodiments disclosed in this invention only involve structures relevant to the embodiments disclosed in this invention; other structures can refer to common designs. Where there is no conflict, the same embodiment and different embodiments of this invention can be combined with each other. Finally, the above descriptions are merely preferred embodiments of this invention and are not intended to limit this invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

[0052] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A contact dryer for drying waste, characterized in that, include: The dryer body has a shell for containing materials and providing a drying space; the shell is a modular structure; a drive mechanism is located on the outside of the dryer body and is used to provide power output for the stepping feeding mechanism; an air guide mechanism is located at the end of the dryer body to form a unidirectional air path to achieve air inlet or outlet, providing airflow conditions for material drying; a stepping feeding mechanism is located inside the dryer body, with at least two arranged along the longitudinal direction of the dryer body and staggered vertically, for layered conveying of the material to be dried, the stepping feeding mechanism is driven by the drive mechanism, and the material moves under the action of the drive mechanism; a spiral discharge end cooperates with the dryer body to output the material after layered drying.

2. The contact dryer according to claim 1, characterized in that, Also includes: A material leveling mechanism is located on one side of the material input position inside the dryer body, driving the material to move and spread it evenly onto the stepping feeding mechanism; the material leveling mechanism includes: a material leveling motor, fixed outside the dryer body, with its input end extending into the dryer body; a material leveling roller shaft, which is drivenly connected to the output end of the material leveling motor; a raised strip is provided on the outside of the material leveling roller shaft, and several raised strips are distributed at equal angles along the circumference of the material leveling roller shaft, and the raised strips are engaged with the material leveling roller shaft.

3. A contact dryer according to claim 1, characterized in that, The housing is provided with a feed inlet, a support structure, and a cleaning structure; the support structure is a support leg, which is located below the housing; the cleaning structure is a cleaning window, which is arranged in a rectangular array at the front and rear ends of the housing, and there are several cleaning windows; the feed inlet is located on one side above the housing.

4. A contact dryer according to claim 1, characterized in that, The air guiding mechanism is provided in two sets, located at both ends of the dryer body, and is a switchable air inlet and air outlet. The air guiding mechanism includes a main air duct, a connecting air duct, a guide connecting pipe, and a drying connecting pipe. The main air duct is used to connect to the fan. The connecting air duct is located at the end of the main air duct away from the fan, and the diameter of the main air duct gradually decreases towards the connecting air duct. The guide connecting pipe is located on the side of the connecting air duct closer to the dryer body. The drying connecting pipe is fixed to the outside of the dryer body and communicates with the inside of the dryer body, providing an installation and connection area for the guide connecting pipe. The main air duct, connecting air duct, guide connecting pipe, and drying connecting pipe are sequentially and sealed together to form a unidirectional air path that runs through the inside of the dryer body.

5. A contact dryer according to claim 1, characterized in that, The driving mechanism includes: a fixed support platform, fixed to the outside of the dryer body and screwed to the dryer body; a telescopic component, mounted on the fixed support platform, with at least two telescopic components forming a group; and a driving connection end, located at the end of the telescopic component away from the fixed support platform.

6. A contact dryer according to claim 1, characterized in that, The stepping feeding mechanism includes: a feeding frame, several of which form a group, and the feeding frames are evenly distributed along the minor axis of the dryer body; a support frame, located at the bottom of the feeding frames, which combines the feeding frames; two support frames form a group, and at least four support frames are provided at the bottom of the feeding frame; multiple stepping linkage frames are provided, located at the lower end of the feeding frames, and the stepping linkage frames are driven by telescopic components; an extension portion is provided above the stepping linkage frame, and the extension portion extends to the top of the feeding frame through the gap between adjacent feeding frames; and a conveying protrusion frame, located above the feeding frames and connected to the extension portion of the stepping linkage frame.

7. A contact dryer according to claim 6, characterized in that, The conveying protrusion is configured as a triangular protrusion with an arc-shaped chamfer at the protrusion position. Several conveying protrusions are arranged along the feeding frame to form a group. At least two groups of conveying protrusions are arranged above a single feeding frame. The two groups of conveying protrusions are connected by different groups of stepping linkage frames.

8. A contact dryer according to claim 6, characterized in that, Multiple sets of the stepping linkage frames are staggered along the long axis of the feeding frame. Different sets of stepping linkage frames are connected by telescopic components, which drive the conveying protrusions at different positions to reciprocate, thereby conveying materials.

9. A drying method for a contact dryer according to any one of claims 1-8, characterized in that, Includes the following steps: S1. The waste material to be dried is fed into the dryer body through the feed port on the shell, and the material falls into the material input position side of the dryer body; S2. The air guide mechanism forms a one-way air path at the end of the dryer body, continuously introducing or discharging airflow to provide stable airflow conditions for material drying. Each group of air guide mechanisms corresponds to a different layer of step feeding mechanism, independently providing airflow for the corresponding layer of material; S3. The drive mechanism is started, which drives the step feeding mechanism to run. At least two step feeding mechanisms that are staggered vertically along the longitudinal direction of the dryer body work synchronously. The step linkage frame drives the conveying protrusion frame to reciprocate under the drive of the telescopic component, thereby driving the material to move along the feeding frame to realize the layered conveying of the material; During the conveying process on each layer of step feeding mechanism, the material is in full contact with the airflow to complete the layered drying; S4. Material discharge: The material after layered drying enters the screw discharge end under the continuous conveying of the step feeding mechanism, and is discharged from the dryer body through the screw discharge end, completing the entire drying process.

10. A drying method for a contact dryer according to claim 9, characterized in that, A material leveling step is added before S2. The material leveling mechanism is started, and the material leveling motor starts working, driving the material leveling roller shaft connected to its output end to rotate. The raised strips on the outside of the material leveling roller shaft rotate synchronously with the roller shaft. The raised strips drive the material to move in the opposite direction along the conveying direction, spreading the accumulated material evenly onto the stepping feeding mechanism below, so that the material is evenly distributed, avoiding local accumulation, and ensuring that the material can fully contact the subsequent airflow.

Images