Sludge drying machine

Abstract

The sludge drying machine comprises a mesh belt, a first dust collecting plate, a second dust collecting plate, a third dust collecting plate, two spiral conveying assemblies and a fan assembly. The first dust collecting plate, the second dust collecting plate and the third dust collecting plate are sequentially arranged below the mesh belt in the width direction of the mesh belt, and one spiral conveying assembly is installed between the first dust collecting plate and the second dust collecting plate. The other spiral conveying assembly is installed between the second dust collecting plate and the third dust collecting plate, and the fan assembly is installed on the side, away from the second dust collecting plate, of the first dust collecting plate and blows air towards the first dust collecting plate. An included angle alpha is formed between the first ash collecting plate and the horizontal plane, an included angle beta is formed between the third ash collecting plate and the horizontal plane, and alpha is smaller than or equal to beta. It is guaranteed that air blown out of the fan assembly can be smoothly blown from the first dust collection plate to the third dust collection plate, and then it is guaranteed that the dust removal effects of the three dust collection plates are relatively consistent.

Description

Technical Field

[0001] The present application relates to the technical field of sludge dryers, and in particular to a sludge dryer. Background Art

[0002] Sludge dryer is a device used to dry sludge. Existing sludge dryers generally use mesh belts to transport sludge. Since the mesh belts are perforated, as the sludge dries, dust will fall along the pores of the mesh belts. If the dust is not cleaned for a long time, it will cause dust accumulation, affecting the cleanliness of the unit and affecting the normal use of the unit.

[0003] In order to collect the fallen dust, the existing sludge dryer is generally equipped with a cleaning structure, which uses a single spiral rod to transport dust. However, when the width of the mesh belt is lengthened, only one spiral rod is set in the cleaning structure, which will cause the dust collecting plate to tilt too much, which is prone to dust accumulation. Utility Model Content

[0004] The purpose of the embodiment of the present application is to provide a sludge dryer, which ensures that the wind blown out by the fan assembly can be blown smoothly from the first ash collecting plate to the third ash collecting plate by limiting the inclination angle of the first ash collecting plate and the third ash collecting plate, thereby ensuring that the cleaning effects of the three ash collecting plates are relatively consistent.

[0005] To achieve the above objectives, this application adopts the following technical solutions:

[0006] In one aspect, a sludge dryer is provided, comprising: a mesh belt, a first ash collecting plate, a second ash collecting plate, a third ash collecting plate, two spiral conveying assemblies, and a fan assembly; the first ash collecting plate, the second ash collecting plate, and the third ash collecting plate are sequentially arranged below the mesh belt along the width direction of the mesh belt; one of the spiral conveying assemblies is installed between the first ash collecting plate and the second ash collecting plate, and the other of the spiral conveying assemblies is installed between the second ash collecting plate and the third ash collecting plate; the fan assembly is installed on a side of the first ash collecting plate away from the second ash collecting plate, and blows air toward the first ash collecting plate;

[0007] The first ash collecting plate is arranged obliquely downward along a first direction and forms an angle α with a horizontal plane. The third ash collecting plate is arranged obliquely upward along the first direction and forms an angle β with a horizontal plane, wherein α≤β.

[0008] Furthermore, 0≤α≤60°.

[0009] Furthermore, 30°≤β≤60°.

[0010] Furthermore, the second dust collecting plate is in an inverted V shape.

[0011] Furthermore, the second ash collecting plate includes a first plate body and a second plate body connected, the first plate body is arranged obliquely upward along the first direction, the second plate body is arranged obliquely downward along the first direction, and an angle γ is formed at the connection between the first plate body and the second plate body, wherein 120°≤γ≤135°.

[0012] Furthermore, the highest point of the second dust collecting plate does not exceed the highest point of the air outlet of the fan assembly.

[0013] Furthermore, the spiral conveying assembly includes an arc tube and a spiral rod, the spiral rod is rotatably installed in the arc tube, the arc mouth of the arc tube faces upward, and the bottom of the arc tube is also provided with an ash outlet, and the ash outlet is arranged at the end of the conveying direction of the spiral rod.

[0014] Furthermore, a plurality of support plates are provided below the arc tube.

[0015] Furthermore, the fan assembly includes at least two air duct machines, and the two air duct machines are arranged at intervals along the length direction of the mesh belt.

[0016] Furthermore, the width of the mesh belt is between 2 and 4 meters.

[0017] The beneficial effect of the present application is that during the sludge drying process, due to the evaporation of water, some fine dust and particulate matter will fall through the pores of the mesh belt to the ash collecting plate below. This scheme adopts two spiral conveying assemblies, which are respectively installed between the first ash collecting plate and the second ash collecting plate, and between the second ash collecting plate and the third ash collecting plate. The fan assembly is installed on the side of the first ash collecting plate away from the second ash collecting plate, and blows air toward the first ash collecting plate. The airflow generated by the fan assembly blows toward the three ash collecting plates. The dust on the ash collecting plates will gradually break away from the ash collecting plates under the wind force and fall onto the two spiral conveying assemblies, and then be transported out. During the blowing process of the fan assembly, since the first ash collecting plate is arranged obliquely downward along the first direction, it forms an angle α with the horizontal plane; the third ash collecting plate is arranged obliquely upward along the first direction, it forms an angle β with the horizontal plane, and α<β. This design is conducive to the wind blown out by the fan assembly to blow smoothly across the surface of the ash collecting plate, ensuring that the cleaning effects of the first ash collecting plate and the third ash collecting plate are relatively consistent, and ensuring the circulation of the airflow, thereby improving the cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present application is further described in detail below with reference to the accompanying drawings and examples.

[0019] Figure 1 This is a partial structural perspective diagram of the sludge dryer according to an embodiment of the present application;

[0020] Figure 2 This is a front view of a partial structure of the sludge dryer according to an embodiment of the present application;

[0021] Figure 3 This is a three-dimensional diagram of the second dust collecting plate according to an embodiment of the present application;

[0022] Figure 4 This is a side view of the spiral conveying assembly described in an embodiment of the present application.

[0023] In the figure: 1. First ash collecting plate; 2. Second ash collecting plate; 201. First plate body; 202. Second plate body; 3. Third ash collecting plate; 4. Screw conveying assembly; 401. Arc tube; 402. Screw rod; 403. Ash outlet; 404. Support plate; 5. Fan assembly; 501. Duct air conditioner. DETAILED DESCRIPTION

[0024] To make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved more clearly, the technical solutions of the embodiments of this application are further described in detail below. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of this application.

[0025] In the description of this application, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0026] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0027] like Figures 1-4As shown, this embodiment provides a sludge dryer, comprising: a mesh belt, a first ash collecting plate 1, a second ash collecting plate 2, a third ash collecting plate 3, two spiral conveying assemblies 4 and a fan assembly 5; the first ash collecting plate 1, the second ash collecting plate 2 and the third ash collecting plate 3 are arranged in sequence below the mesh belt along the width direction of the mesh belt, one spiral conveying assembly 4 is seamlessly installed between the first ash collecting plate 1 and the second ash collecting plate 2, and the other spiral conveying assembly 4 is seamlessly installed between the second ash collecting plate 2 and the third ash collecting plate 3, the fan assembly 5 is installed on the side of the first ash collecting plate 1 away from the second ash collecting plate 2, and blows air toward the first ash collecting plate 1; the first ash collecting plate 1 is arranged obliquely downward along the first direction, forming an angle α with the horizontal plane, and the third ash collecting plate 3 is arranged obliquely upward along the first direction, forming an angle β with the horizontal plane, where α≤β.

[0028] Based on the above scheme, during the sludge drying process, as water evaporates, fine dust and particulate matter inevitably fall through the mesh belt's pores onto the first, second, and third ash collecting plates 1, 2, and 3 below. These plates serve as a primary dust collection device, playing a key role. Two spiral conveyor assemblies 4 are installed at appropriate locations between the first and second ash collecting plates 1, 2, and between the second and third ash collecting plates 2, 3, respectively. Their primary function is to continuously convey dust and particulate matter from the ash collecting plates forward, preventing them from lingering and accumulating on the plates. A fan assembly 5 is strategically mounted on the side of the first ash collecting plate 1 facing away from the second ash collecting plate 2, blowing air toward the first ash collecting plate 1. This design utilizes the airflow generated by the fan to aid in the dust's descent and transport. The airflow generated by the fan assembly 5 not only directly onto the first ash collecting plate 1 but also onto the second and third ash collecting plates 2, 3. This all-round airflow ensures that dust is subjected to sufficient wind force, making it easier to dislodge from the plates. The first ash collecting plate 1 is arranged obliquely downward along the first direction, forming an angle α with the horizontal plane. This design allows the dust to slide down the slope more easily onto the spiral conveying assembly 4 when affected by the airflow of the fan. The third ash collecting plate 3 is arranged obliquely upward along the first direction, forming an angle β with the horizontal plane, and α≤β. Although this seems to be opposite to the natural sliding direction of dust, in fact, this design helps to form a dynamic airflow cycle under the action of the fan airflow. That is, after blowing through the first ash collecting plate 1, the airflow will rise along the gap between the ash collecting plates and blow toward the third ash collecting plate 3, and then be guided back to the first ash collecting plate 1 area or continue to flow forward through the oblique surface of the third ash collecting plate 3. This circulating airflow not only improves the cleaning effect, but also helps to maintain air circulation and temperature uniformity inside the unit.

[0029] It should be noted that the purpose of setting the angle of the first dust collecting plate 1 and the third dust collecting plate 3 is to allow the heavy sludge blocks to be transported along the plate to the spiral conveying component 4 under the action of gravity, and the blowing function of the fan component 5 is to allow the lighter dust to be blown off. Regarding the angle, if the position is not restricted, the larger the angle, the better.

[0030] In addition, a guide member is provided at the air outlet of the fan assembly 5, and the guide member includes a first end and a second end. The first end is connected to the fan assembly, and the second end is arranged toward the first ash collecting plate. The air outlet area of ​​the first end is larger than the air outlet area of ​​the second end, so that the air blown out from the fan assembly 5 becomes smaller after being guided by the guide member, thereby increasing the wind speed and making it easier to blow toward the second ash collecting plate and the third ash collecting plate.

[0031] In general, through the synergistic effect of the double-screw conveying component 4 and the fan component 5, efficient collection and transportation of fallen dust and particulate matter is achieved, effectively preventing the accumulation of dust on the ash collecting plate, thereby reducing the impact of dust accumulation on the internal environment of the unit, which is beneficial to the normal operation of the equipment and extending its service life. By keeping the ash collecting plate clean and the air circulating inside the unit, the heat transfer efficiency in the drying process is improved, thereby accelerating the drying speed of the sludge, and reducing energy waste and environmental pollution caused by dust accumulation, meeting the requirements of energy conservation and environmental protection. At the same time, this solution is suitable for mesh belt designs of different widths, and actual needs can be met by adjusting the layout of the spiral conveying component 4 and the ash collecting plate.

[0032] Specifically, 0≤α≤60°, 30°≤β≤60°. Selecting a smaller inclination angle α can ensure that the dust can smoothly slide down the slope and fall onto the spiral conveying assembly 4 when it is affected by the airflow blown by the fan assembly 5. An excessively large inclination angle may cause the dust to slide too quickly, increasing the load on the spiral conveying assembly 4 and even causing dust to splash. The range of 0 to 60° provides a reasonable balance, which not only ensures the smooth sliding of dust, but also avoids the problems caused by excessively large angles. It should be noted here that the first dust collecting plate 1 can be set horizontally, that is, α=0. The third dust collecting plate 3 adopts an upward oblique arrangement and is set at a larger inclination angle β. This is mainly to form an airflow circulation that is conducive to the upward lifting of dust and the backflow or forward flow along the slope under the action of the airflow generated by the fan assembly 5. This design helps to enhance the blowing effect of the fan assembly 5 and improve the cleaning efficiency. The range of 30° to 60° ensures that the third dust collecting plate 3 can effectively guide the airflow circulation and prevent dust from staying on the dust collecting plate for a long time. At the same time, this range also takes into account the stability of the equipment structure and the difficulty of manufacturing.

[0033] By setting a reasonable inclination angle range, this solution can ensure that the airflow generated by the fan assembly 5 can blow smoothly over the surface of the ash collecting plate, so that the dust is subjected to sufficient wind force and leaves the ash collecting plate. At the same time, the synergistic effect of the double spiral conveying assembly 4 further improves the dust conveying efficiency, thereby realizing the efficient collection and cleaning of fallen dust and particulate matter. The large-angle inclination design of the third ash collecting plate 3 promotes the circulation of airflow, so that the airflow generated by the fan assembly 5 can be more fully utilized in the entire cleaning process. This airflow circulation not only improves the cleaning effect, but also helps to maintain air circulation and temperature uniformity inside the unit. In addition, the reasonable inclination angle range also takes into account the stability of the equipment structure and the difficulty of manufacturing. Through precise calculations and simulation tests, we ensure that the layout of the ash collecting plate and the spiral conveying assembly 4 can not only meet the cleaning needs, but also ensure the long-term stable operation of the equipment.

[0034] In some embodiments, the second ash collecting plate 2 is in an inverted V shape. The inverted V-shaped second ash collecting plate 2, through its expanded collection area, more effectively captures fine dust and particulate matter falling from the mesh belt pores, significantly improving the dust collection efficiency. At the same time, this design cleverly guides the airflow generated by the fan assembly 5 to form vortices or swirls on the surface of the ash collecting plate, making the airflow distribution more uniform and enhancing the dust cleaning effect. Under the action of the airflow, the inclined surfaces on both sides of the inverted V shape cause the dust to slide down the inclined surfaces more easily, reducing the residence time of the dust on the ash collecting plate and effectively preventing the accumulation of dust. In addition, this design also enhances the structural stability of the ash collecting plate, enabling it to withstand greater loads without being easily deformed, further improving the durability and overall stability of the equipment.

[0035] As an optional specific implementation method, the second ash collecting plate 2 can be in an inverted U shape in addition to being in a sharp-angled inverted V shape, that is, the original angle is replaced with an arc surface with an arc, so that the resistance is smaller when the wind blows through, and the wind blown out of the fan assembly 5 is more likely to blow to the third ash collecting plate.

[0036] Specifically, the second dust collecting plate 2 includes a first plate 201 and a second plate 202 connected to each other. The first plate 201 is arranged obliquely upward along the first direction, and the second plate 202 is arranged obliquely downward along the first direction. The connection between the first plate 201 and the second plate 202 forms an angle γ, wherein 120°≤γ≤135°. The first plate 201 is arranged obliquely upward along the first direction. This design helps to guide part of the airflow to flow upward along the inclined surface under the action of the airflow generated by the fan assembly 5, forming an upward airflow channel. At the same time, the oblique upward arrangement also enables the first plate 201 to receive and temporarily store dust falling from above, preparing for subsequent sliding and transportation. The second plate 202 is arranged obliquely downward along the first direction, in sharp contrast to the first plate 201. This oblique downward arrangement allows the dust to more easily slide down the inclined surface onto the spiral conveying assembly 4 when affected by the airflow or its own gravity, thereby achieving rapid dust cleaning. The first plate 201 and the second plate 202 can be manufactured in an integrally formed manner or connected by a connector. The specific connection method of the first plate 201 and the second plate 202 is not limited here, but technical solutions that can achieve the connection between the two also fall within the scope of protection of this application.

[0037] In addition, the junction between the first plate 201 and the second plate 202 forms an angle γ, which is precisely controlled between 120° and 135°. This angle range is set based on a comprehensive consideration of airflow dynamics, dust shedding characteristics, and the stability of the device structure. A larger angle γ helps form a smoother airflow channel at the junction, reducing airflow resistance and allowing airflow to pass more smoothly and act on the entire surface of the dust collection plate. At the same time, this angle also ensures that dust can transition smoothly during the sliding process, avoiding accumulation or stagnation at the junction.

[0038] At the same time, the highest point of the second ash collecting plate 2 does not exceed the highest point of the air outlet of the fan assembly 5. By limiting the highest point of the second ash collecting plate 2 to below the highest point of the air outlet, it is ensured that the airflow generated by the fan assembly 5 can flow smoothly through the joint of the second ash collecting plate 2 and continue to flow backward while blowing toward the first ash collecting plate 1. This helps maintain the continuity and stability of the airflow and improve the efficiency of the entire dust cleaning system. The smooth transition at the joint reduces the resistance of the airflow during passage and avoids eddies or airflow turbulence caused by structural mutations. This not only improves the utilization efficiency of the airflow, but also reduces the energy loss caused by wind resistance.

[0039] Crucially, this design prevents the entire second ash collecting plate 2 or its joint from directly blocking airflow from the fan assembly 5 from reaching the third ash collecting plate 3. If the joint or other parts of the second ash collecting plate 2 were located in the air supply path, this could weaken the airflow to the third ash collecting plate 3, impacting cleaning efficiency. By placing the highest point below the air supply port and ensuring it does not block airflow to the third ash collecting plate 3, the entire ash collection system can be guaranteed to receive uniform and effective airflow. A preferred solution is to place the highest point of the second ash collecting plate 2 in the middle of the air supply port.

[0040] Furthermore, the spiral conveying assembly 4 includes an arc-shaped tube 401 and a spiral rod 402. The spiral rod 402 is rotatably mounted within the arc-shaped tube 401, with the arc opening of the arc-shaped tube 401 facing upward. The bottom of the arc-shaped tube 401 is also provided with an ash outlet 403, which is located at the end of the spiral rod 402 in the conveying direction. The spiral rod 402 is rotatably mounted within the arc-shaped tube 401, with the arc opening of the arc-shaped tube 401 facing upward. This arrangement enables the spiral rod 402 to effectively push and convey dust above it during rotation. The design of the arc-shaped tube 401 not only conforms to the natural falling trajectory of dust, but also ensures the stability of the dust during the conveying process, reducing the possibility of dust overflow. More importantly, an ash outlet 403 is carefully opened at the bottom of the arc tube 401, and this ash outlet 403 is cleverly set at the end of the conveying direction. In this way, when the spiral rod 402 transports the dust from the starting end of the ash collecting plate to the end, the dust can be smoothly discharged through the ash outlet 403 and enter the subsequent collection or processing system. This design not only simplifies the dust collection process, but also improves the efficiency and reliability of the entire cleaning structure.

[0041] Furthermore, a plurality of support plates 404 are provided below the arc-shaped tube 401. These support plates 404 not only provide solid support for the arc-shaped tube 401, but also effectively disperse the force generated by the arc-shaped tube 401 and its internal spiral rod 402 during rotation through their distribution and structural design, thereby reducing vibration and noise. The provision of the support plates 404 also makes the structure of the entire spiral conveying assembly 4 more stable, improving its durability and reliability in harsh working environments. In addition, the support plates 404 are also easy to clean and maintain. When the spiral conveying assembly 4 needs to be cleaned or replaced, the staff can easily remove the dust and debris under the support plates 404 to keep the equipment clean and tidy.

[0042] Optionally, the fan assembly 5 includes at least two duct machines 501, and the two duct machines 501 are spaced apart along the length direction of the mesh belt. By adopting multiple duct machines 501, it can be ensured that each area along the length direction of the first dust collecting plate 1 can obtain sufficient air supply, thereby achieving uniform blowing and collection of dust. This distributed air supply design can not only improve the working efficiency of the fan assembly 5, but also reduce the dust accumulation problem caused by insufficient local air supply. Moreover, the interval setting of the duct machines 501 is also convenient for adjustment and optimization according to the actual size of the sludge dryer and the amount of dust generated. By adjusting the number and position of the duct machines 501, we can respond to different work scenarios and needs more flexibly, and further improve the adaptability and reliability of the double-helix cleaning structure.

[0043] It should be noted that the width of the mesh belt is between 2-4 meters. The setting of this width range is based on comprehensive consideration of sludge drying efficiency, processing capacity and equipment stability. A wider mesh belt can carry more sludge, thereby improving the processing capacity of the dryer and meeting the needs of large-scale production. At the same time, the appropriate mesh belt width can also ensure that the sludge is evenly distributed during the drying process, improving drying efficiency and quality. Among them, the conventional mesh belt width is 1.8 meters, and for the 2.6-meter wide mesh belt, the existing cleaning structure cannot achieve effective cleaning, so it is necessary to adopt the above-mentioned double-helix cleaning structure to ensure that dust does not continue to accumulate during the sludge drying process.

[0044] It's worth noting that because the mesh belt is relatively wide, exceeding the effective coverage of traditional single-stage ash collection devices, the ash collection plates must be designed to match this width to ensure that sludge and waste are effectively collected and promptly cleaned. Specifically, the width of the ash collection plates is designed to be equal to or slightly larger than the mesh belt width. This layout ensures that the ash collection plates can fully cover the entire width of the mesh belt, preventing sludge and waste from accumulating at the edges of the mesh belt or in uncovered areas. This matching design not only improves waste collection efficiency, but also helps maintain internal cleanliness of the equipment and reduces the risk of equipment failure due to waste accumulation.

[0045] In addition, in order to avoid the problem of waste accumulation caused by excessive mesh belt width, when the mesh belt width exceeds 2 meters, a single section of ash collecting plate cannot achieve effective ash collection, which will cause dust to accumulate on the ash collecting plate, and in serious cases, it will cause unit failure. Therefore, the sludge dryer described in this application adopts a multi-section ash collecting device, such as dividing the ash collecting plate into a first ash collecting plate 1, a second ash collecting plate 2 and a third ash collecting plate 3. These ash collecting plates are differentiated in design according to the characteristics and processing requirements of the waste, such as adjusting the inclination angle, adding anti-slip measures, etc., to optimize the cleaning effect. The use of a multi-section ash collecting device not only disperses the pressure of waste collection, but also improves the flexibility and adaptability of the entire cleaning system.

[0046] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," and other positions or relationships are used solely for ease of description and simplified operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0047] Throughout this specification, references to terms such as "an embodiment" or "example" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0048] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0049] The technical principles of the present application have been described above in conjunction with specific embodiments. These descriptions are intended solely to explain the principles of the present application and are not to be construed in any way as limiting the scope of protection of the present application. Based on the explanations herein, those skilled in the art will be able to devise other specific implementations of the present application without inventive effort, and such implementations will fall within the scope of protection of the present application.

Claims

1. A sludge dryer, characterized in that: include: A mesh belt, a first ash collecting plate (1), a second ash collecting plate (2), a third ash collecting plate (3), two spiral conveying assemblies (4) and a fan assembly (5); the first ash collecting plate (1), the second ash collecting plate (2) and the third ash collecting plate (3) are arranged in sequence below the mesh belt along the width direction of the mesh belt, one of the spiral conveying assemblies (4) is installed between the first ash collecting plate (1) and the second ash collecting plate (2), and the other of the spiral conveying assemblies (4) is installed between the second ash collecting plate (2) and the third ash collecting plate (3); the fan assembly (5) is installed on the side of the first ash collecting plate (1) away from the second ash collecting plate (2) and blows air toward the first ash collecting plate (1); The first ash collecting plate (1) is arranged obliquely downward along a first direction, forming an angle α with a horizontal plane, and the third ash collecting plate (3) is arranged obliquely upward along the first direction, forming an angle β with a horizontal plane, wherein α≤β.

2. The sludge drying machine according to claim 1, characterized in that: 0≤α≤60°。 3. The sludge drying machine according to claim 1, characterized in that: 30°≤β≤60°。 4. The sludge dryer according to any one of claims 1 to 3, characterized in that: The second dust collecting plate (2) is in an inverted V shape.

5. The sludge drying machine according to claim 4, characterized in that: The second dust collecting plate (2) comprises a first plate body (201) and a second plate body (202) connected to each other, wherein the first plate body (201) is arranged obliquely upward along a first direction, and the second plate body (202) is arranged obliquely downward along the first direction, and an angle γ is formed at the connection between the first plate body (201) and the second plate body (202), wherein 120°≤γ≤135°.

6. The sludge drying machine according to claim 4, characterized in that: The highest point of the second dust collecting plate (2) does not exceed the highest point of the air outlet of the fan assembly (5).

7. The sludge dryer according to any one of claims 1 to 3, characterized in that: The spiral conveying assembly (4) comprises an arc-shaped tube (401) and a spiral rod (402). The spiral rod (402) is rotatably installed in the arc-shaped tube (401). The arc opening of the arc-shaped tube (401) faces upward. An ash outlet (403) is also provided at the bottom of the arc-shaped tube (401). The ash outlet (403) is arranged at the end of the spiral rod (402) in the conveying direction.

8. The sludge drying machine according to claim 7, characterized in that: A plurality of support plates (404) are provided below the arc-shaped tube (401).

9. The sludge dryer according to any one of claims 1 to 3, characterized in that: The fan assembly (5) comprises at least two air duct machines (501), and the two air duct machines (501) are arranged at intervals along the length direction of the mesh belt.

10. The sludge dryer according to any one of claims 1 to 3, characterized in that: The width of the mesh belt is between 2 and 4 meters.

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