Scraper assembly and thin layer drying device

Abstract

The invention provides a scraper assembly and a thin layer drying device, the scraper assembly comprises a folding line, a mounting part and a blade part, the folding line and the feeding direction X form a first included angle alpha, and the opening direction deviates from the feeding direction X; the mounting part is connected to the first side of the folding line, and the mounting part is used for connecting a rotor; the blade part is connected to the second side of the folding line, and a second included angle beta is formed between the blade part and the mounting part; the scraper assembly is provided with at least two structural units including a propelling type unit, a reverse propelling type unit, a stirring type unit and a discharging type unit, the drying efficiency of the thin layer drying device is improved, the operation stability of the device is enhanced, and the adaptability of the thin layer drying device to different materials and drying processes is improved.

Description

Technical Field

[0001] The present invention relates to the field of drying equipment, in particular to a scraper assembly and a thin layer drying device. Background Art

[0002] The thin layer drying device is a highly efficient and energy-saving sludge drying equipment. Its core principle is to evenly distribute the wet sludge on the hot wall surface to form a thin layer through the rotor, and use heat media such as steam or thermal oil for indirect heating to quickly evaporate the water in the sludge and achieve continuous feeding and discharging.

[0003] In thin-layer drying systems, scrapers are a key component. According to patent document CN115504651n, scrapers are typically mounted on the rotor. During operation, as the rotor rotates, the scrapers evenly spread the wet sludge onto the hot wall surface, forming a thin layer. Therefore, the rationality of the scraper design is directly related to the drying efficiency and overall operational stability of the thin-layer drying system.

[0004] However, the existing scraper design exposes many problems in practical applications, which seriously restricts the further improvement of the performance of thin-layer drying devices.

[0005] On the one hand, existing scrapers are prone to sludge adhesion. Over time, the sludge layer attached to the scrapers thickens. This not only increases friction between the scrapers and the hot wall surface, leading to increased rotor resistance and increased energy consumption, but also prevents the scrapers from accurately and evenly applying wet sludge to the hot wall surface as designed, nor completely scraping off dry sludge.

[0006] On the other hand, existing scrapers are of a single type and have relatively limited functions. Each type of scraper is only suitable for sludge drying under specific conditions. When processing different materials or using different drying processes, existing scrapers are difficult to meet the diverse production needs, resulting in poor versatility and adaptability of thin-layer drying devices. Summary of the Invention

[0007] The purpose of the present invention is to address the deficiencies in the prior art and provide a scraper assembly and a thin layer drying device to further improve the drying efficiency of the thin layer drying device, enhance the stability of the device operation, and improve its adaptability to different materials and drying processes.

[0008] In order to achieve the above object, the present invention provides the following technical solutions: A scraper assembly comprising: a folding line, wherein the folding line forms a first angle α with the feeding direction X, and the opening direction is away from the feeding direction X; a mounting portion connected to a first side of the folding line, the mounting portion being used to connect to a rotor; a blade portion, the blade portion being connected to a second side of the folding line, and forming a second angle β between the blade portion and the mounting portion; The scraper assembly has at least two structural units: Propulsion units: Contains two fold lines with α=45°; The angle β of the corresponding two blades is 45°, and the opening direction is in the same direction as the rotor rotation direction W; Reverse thrust unit: Contains a folding line with α=45° and a folding line with α=0°; The angle β of the corresponding two blades is 45°, and the opening direction is in the same direction as the rotor rotation direction W; Stirring unit: Contains two fold lines with α = 0°; The angle β of the corresponding two blades is 45°, and the opening direction is in the same direction as the rotor rotation direction W; Discharge unit: Contains a fold line with α = 45°; The corresponding blade portion has an angle of β=30°, and the opening direction is opposite to the rotor rotation direction W.

[0009] As a preferred embodiment, the plurality of structural units are arranged in a plurality of rows along the circumferential direction of the rotor, and each row is spaced apart along the feed direction X, and the feed direction X coincides with the axial centerline of the rotor.

[0010] As a preferred embodiment, the multiple columns are divided into odd columns and even columns, and each column is sequentially provided with the 1st to Nth stations along the feeding direction X; The Nth station of each odd-numbered column is equipped with a discharge unit; The Nth station of each even-numbered column is equipped with a reverse thrust unit.

[0011] As a preferred embodiment, for the odd-numbered nth column, the installation position of the propulsion unit satisfies: Exclude the 1st to 2nd stations, and the (N-1)th to Nth stations; Install push-type units at stations [(n-1) / 2 -1], [(n-1) / 2 +5], and [(n-1) / 2 +11].

[0012] As a preferred embodiment, for an even-numbered nth column, the installation position of the propulsion unit satisfies: Exclude the 1st to 2nd workstations and the Nth workstation; Install push-type units at stations [n / 2 -2], [n / 2 +4], and [n / 2 +10].

[0013] As a preferred embodiment, in the push-type unit, the reverse-thrust unit and the stirring unit, the two blade portions are spaced apart along the feeding direction X.

[0014] As a preferred embodiment, the blade portion is T-shaped.

[0015] As a preferred embodiment, the push-type units are increased in steps as the number of columns increases.

[0016] As a preferred embodiment, the blade portion is a stainless steel composite plate, comprising: The base layer is carbon steel; The composite layer is alloy steel.

[0017] A thin layer drying device, comprising the scraper assembly of the above embodiment, further comprising: A rotor is provided on which the scraper assembly is mounted.

[0018] Compared with the existing technology, this technical solution has the following advantages: The folding line forms a first angle α with the feed direction X, and the opening direction is away from the feed direction X, and a second angle β is formed between the blade portion and the mounting portion. This specific angle and opening direction design enables the scraper assembly to better guide the flow of materials such as sludge when in contact with the material, thereby reducing the accumulation and adhesion of the material on the scraper.

[0019] Depending on the configuration of α and β, the scraper assembly can form push-type units, reverse-push units, agitation units, and discharge units. These different structural units work together to form a complete system for handling sludge and other materials, achieving multiple functions such as push, reverse, agitation, and discharge. This synergistic effect significantly improves material handling efficiency and quality, meeting the needs of diverse operating conditions. Whether handling materials with different characteristics or adapting to different drying process requirements, it demonstrates excellent performance, providing strong support for the development of thin-layer drying technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of the propulsion unit of the present invention; Figure 2 It is a left side view of the propulsion unit of the present invention; Figure 3 This is a schematic structural diagram of the reverse thrust unit of the present invention; Figure 4 It is a left side view of the reverse thrust unit of the present invention; Figure 5 Schematic diagram of the structure of the stirring unit of the present invention; Figure 6It is a left side view of the stirring unit of the present invention; Figure 7 This is a schematic structural diagram of the unloading unit of the present invention; Figure 8 It is a left side view of the discharge type unit of the present invention; Figure 9 Schematic diagram of the structure of the rotor of the present invention; Figure 10 Schematic diagram of the arrangement of the scraper assembly of the present invention. DETAILED DESCRIPTION

[0021] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are for illustrative purposes only, and those skilled in the art will readily appreciate other obvious variations. The basic principles of the present invention defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0022] As mentioned in the background, existing scraper blades are prone to adhesion during contact with sludge. This adhesion not only increases friction between the scraper blade and the sludge, significantly increasing equipment energy consumption, but also affects the normal flow of sludge, reducing treatment efficiency. Furthermore, existing scraper blades are limited in type and are difficult to adapt to the diverse sludge treatment requirements under different operating conditions. For example, differences in viscosity and moisture content among different sludges result in varying treatment results.

[0023] In view of this, please refer to Figures 1 to 9 The scraper assembly provided in the embodiment of the present invention can solve this problem, which will be described in detail below.

[0024] An embodiment of the present invention provides a scraper assembly, comprising: Folding lines 100a-100g, wherein the folding lines 100a-100g form a first angle α with the feeding direction X, and the opening direction is away from the feeding direction X; A mounting portion 200 , the mounting portion 200 being connected to a first side of the folding lines 100 a - 100 g and configured to connect to the rotor 400 ; Blade portions 300a-300g, each of which is connected to a second side of the folding line 100a-100g, and forms a second angle β with the mounting portion 200; The scraper assembly has at least two structural units: Propulsion units: It includes two folding lines 100a and 100b with α=45°; The angle β of the corresponding two blade portions 300a and 300b is 45°, and the opening direction is in the same direction as the rotor rotation direction W; Reverse thrust unit: It includes a folding line 100c with an α=45° and a folding line 100d with an α=0°; The angle β of the corresponding two blade portions 300c and 300d is 45°, and the opening direction is in the same direction as the rotor rotation direction W; Stirring unit: It includes two folding lines 100e and 100f with α=0°; The angle β of the corresponding two blade portions 300e and 300f is 45°, and the opening direction is in the same direction as the rotor rotation direction W; Discharge unit: Contains a fold line of α = 45° 100g; The corresponding blade portion 300 g has an angle of β=30°, and the opening direction is opposite to the rotation direction W of the rotor.

[0025] The fold lines 100a-100g form a first angle α with the feed direction X, and the opening direction faces away from the feed direction X. Furthermore, the blades 300a-300g form a second angle β with the mounting portion 200. This specific angle and opening direction design allows the scraper assembly to better guide the flow of materials such as sludge when in contact with them, reducing accumulation and adhesion of materials on the scraper. The mounting portion 200 primarily functions to connect to the rotor 400, enabling the scraper assembly to move synchronously with the rotation of the rotor 400. As the rotor 400 rotates, the blades 300a-300g perform various functions, including propulsion, reverse propulsion, agitation, and discharge of the material.

[0026] Depending on the configuration of α and β, the scraper assembly can form push-type units, reverse-push units, agitation units, and discharge units. These different structural units work together to form a complete system for handling sludge and other materials, achieving multiple functions such as push, reverse, agitation, and discharge. This synergistic effect significantly improves material handling efficiency and quality, meeting the needs of diverse operating conditions. Whether handling materials with different characteristics or adapting to different drying process requirements, it demonstrates excellent performance, providing strong support for the development of thin-layer drying technology.

[0027] The mounting portion 200 and blade portions 300a-300g are formed by folding a sheet material along fold lines 100a-100g, with the fold lines 100a-100g defining the two portions. Fold lines 100a-100g form a first angle α with the feed direction X, and the openings face away from the feed direction X. This design allows the scraper to utilize the angles of the fold lines to guide sludge flow when in contact with the sludge, reducing sludge accumulation on the scraper surface. Furthermore, the openings face away from the feed direction, preventing sludge from accumulating at the fold lines and reducing the risk of sludge adhesion.

[0028] like Figure 1 and Figure 2 As shown, the push-type unit is used to push the material along the feeding direction X to avoid blockage or stagnation.

[0029] The two blades 300a and 300b of the push-type unit are spaced apart along the feeding direction X to push the material in the feeding direction X, thereby improving the drying efficiency. The use of the two blades 300a and 300b further improves the pushing efficiency.

[0030] The angle α of the two folding lines 100 a and 100 b is 45°, and the opening direction is away from the feeding direction X. When the material contacts the scraper, a component force is generated that is beneficial to guiding the material flow and providing sufficient propulsion force.

[0031] The corresponding angle β of the two blades 300a and 300b is 45°, which corresponds to the angle of the fold lines 100a and 100b. The blades 300n and 300n act on the material at a 45° angle, decomposing the rotational force of the rotor 400 into a force component along the feed direction and a force component perpendicular to the feed direction. The force component along the feed direction provides propulsion for the material, while the force component perpendicular to the feed direction helps break up the material and reduce material agglomeration, thereby improving propulsion efficiency and drying results.

[0032] The openings of the two blades 300a and 300b are oriented in the same direction as the rotor's rotational direction W. This design is designed to better accommodate the rotational motion of the rotor 400, ensuring that the blades 300a and 300b maintain effective contact and interaction with the material throughout the rotation process. This ensures that the propulsion unit can continuously and stably exert its propulsion function during the rotation of the rotor 400, thereby improving the operating efficiency and reliability of the entire thin-layer drying device.

[0033] refer to Figure 1The blades 300a and 300b are T-shaped, and the width of the outer ends of the blades 300a and 300b is greater than the width of the inner ends of the blades 300a and 300b. The inner ends of the blades 300a and 300b are connected to the mounting portion 200. This allows the outer ends of the blades 300a and 300b to cover a larger area when in contact with the material.

[0034] Continue to refer Figure 1 The mounting portion 200 is provided with a mounting hole 210 for passing fasteners such as bolts so as to be mounted on the rotor 400 .

[0035] like Figure 3 and Figure 4 As shown, the reverse push unit is used to limit the material from flowing too fast in the feeding direction X and prevent material accumulation. The difference between the reverse push unit and the push unit is that the α of one fold line 100c is 45° and the α of the other fold line 100d is 0°.

[0036] Fold line 100d has an α of 0°, meaning it is parallel to the feed direction X. When the corresponding blade portion 300d rotates, it restricts the material from flowing too quickly in the feed direction X, preventing material accumulation. At this point, the blade portion 300d continuously interacts with the material, altering its motion and preventing it from passing quickly and unimpeded.

[0037] The blades 300c and 300d are arranged at intervals along the feed direction X. The material first passes through the blades 300c, which generates a forward propulsion force to ensure the material's forward flow. The material then passes through the blades 300d, which limits the material from flowing too quickly.

[0038] like Figure 5 and Figure 6 As shown, the stirring unit is used to continuously tumble the material as it flows toward the outlet, increasing the contact area between the material and the heat medium and improving drying efficiency. Its structure differs from that of the pusher unit in that the angle α of the two fold lines 100e and 100f is 0°.

[0039] The two folding lines 100e and 100f are parallel to the material flow direction X, causing the material to tumble.

[0040] like Figure 7 and Figure 8As shown, the discharge unit is used to quickly and comprehensively discharge the dried material, after its moisture has been evaporated, into the downstream process. The outlet is located at the end of the feed direction X. The structure of the discharge unit differs from that of the pusher unit in that the fold line 100g has an angle of α = 45°, the corresponding blade portion 300g has an angle of β = 30°, and the opening direction is opposite to the rotor rotation direction W.

[0041] When the opening of β is oriented in the opposite direction of the rotor 400's rotation, the dry material experiences resistance in the opposite direction of rotation. This resistance forces the dry material to escape from the opening of the blade 300g more quickly and fall toward the outlet. Furthermore, the 30° angle of β for the blade 300g ensures sufficient propulsion while reducing friction between the blade 300g and the dry material, making it easier to push and discharge the dry material.

[0042] The blades 300a-300g are made of stainless steel composite plates, including: The base layer is carbon steel; The composite layer is alloy steel.

[0043] In this embodiment, the cladding layer may wrap around the surface of the base layer. The carbon steel has excellent thermal conductivity and structural strength. The alloy steel may be a low-alloy, high-strength structural steel with excellent corrosion and wear resistance. Thus, the blades 300a-300g possess both corrosion and wear resistance, ensuring their service life and operational stability, effectively meeting the requirements of these complex operating conditions.

[0044] like Figure 9 As shown, multiple mounting plates 410 are provided on the outer wall of the rotor 400. The mounting portion 200 is fixed to the mounting plates 410, and the blade portions 300a-300g are arranged outward. The mounting plates 410 extend along the length of the rotor 400, and multiple mounting plates 410 are spaced apart along the circumference of the rotor 400.

[0045] In this way, the multiple structural units are arranged in multiple rows along the circumference of the rotor 400, with each row spaced apart along the feed direction X, which coincides with the axial centerline of the rotor 400. This arrangement allows the material, after entering the equipment, to pass through each structural unit sequentially along the axial direction of the rotor 400, forming an orderly processing flow. Furthermore, the multi-row arrangement increases the contact opportunities between the material and the structural units, improving processing efficiency.

[0046] The arrangement of the push-type unit, reverse-thrust unit, stirring unit, and discharge unit is based on the principles of fluid mechanics and thermodynamics. In this embodiment, the multiple columns are divided into odd-numbered columns and even-numbered columns, and each column is sequentially provided with the 1st to Nth stations along the feeding direction X.

[0047] The Nth station of each odd-numbered column is equipped with a discharge unit; The Nth station of each even-numbered column is equipped with a reverse thrust unit.

[0048] The discharge unit focuses on efficiently unloading processed dry materials, while the reverse push unit controls the flow rate and stability of the material. Alternating between these two units at the Nth station in odd and even rows ensures both stable propulsion and processing of the material during its flow and smooth discharge at the outlet.

[0049] The installation rules of the propulsion unit are as follows: 1. For the odd-numbered nth column, the installation position of the propulsion unit satisfies: Exclude the 1st to 2nd stations, and the (N-1)th to Nth stations; Install push-type units at stations [(n-1) / 2 -1], [(n-1) / 2 +5], and [(n-1) / 2 +11].

[0050] The pusher unit is excluded from the first and second stations because the material has just entered the equipment and has not yet been fully dispersed. Installing a pusher unit at this stage may cause uneven material accumulation or excessive localized stress, affecting subsequent processing. Therefore, a stirring unit is installed at the first and second stations to fully stir the material as it enters the equipment.

[0051] The push-type excludes the (N-1)th to Nth stations because the material has been basically processed near the exit. At this time, the main task is to unload the material smoothly, that is, the Nth station is equipped with a unloading unit, and the (N-1)th station is equipped with a stirring unit to realize the unloading of dry matter.

[0052] The remaining empty spaces in the odd-numbered nth column are installed with stirring units, which cooperate with the propulsion units to achieve sufficient stirring and propulsion of the material, further improve the drying efficiency of the thin layer drying device, and enhance the stability of the device operation.

[0053] 2. For an even-numbered row n, the installation position of the propulsion unit satisfies: Exclude the 1st to 2nd workstations and the Nth workstation; Install push-type units at stations [n / 2 -2], [n / 2 +4], and [n / 2 +10].

[0054] Similarly, the 1st and 2nd stations of the even-numbered columns are equipped with stirring units to fully stir the material entering the equipment. The Nth station is equipped with a reverse thrust unit. This unit, in conjunction with the reverse thrust unit installed at the Nth station of the even-numbered columns, facilitates the unloading of dry materials. The remaining holes in the even-numbered columns are equipped with stirring units.

[0055] Pusher units are installed at positions [(n - 1) / n- 1], [(n - 1) / 2 + 5], and [(n - 1) / 2 + 11] in odd-numbered columns, and at positions [n / 2 - 2], [n / 2 + 4], and [n / 2 + 10] in even-numbered columns. These positions are determined through mathematical calculations related to the number of columns, n. This design ensures a uniform and rational distribution of pusher units within the odd-numbered columns. As the number of columns, n, and n, changes, the pusher unit positions are adjusted accordingly, ensuring effective material propulsion in all columns and orderly material flow within the equipment.

[0056] refer to Figure 10 According to the installation rules of the propulsion unit, the arrangement rules of the scraper assembly on the rotor 400 can be formulated as follows: In the first column, the 5th and 11th stations are equipped with push-type units, the Nth station is equipped with a discharge-type unit, and the remaining stations are equipped with stirring units; In the second column, the 5th and 11th stations are equipped with push-type units, the Nth station is equipped with a reverse-thrust unit, and the remaining stations are equipped with stirring units; In the third column, the 6th and 12th stations are equipped with pusher units, the Nth station is equipped with a discharger unit, and the remaining stations are equipped with mixing units; In the 4th column, the 6th and 12th stations are equipped with push-type units, the Nth station is equipped with a reverse thrust unit, and the remaining stations are equipped with stirring units; In the 5th column, the 7th and 13th stations are equipped with pusher units, the Nth station is equipped with a discharger unit, and the remaining stations are equipped with mixing units; In the 6th column, the 7th and 13th stations are equipped with push-type units, the Nth station is equipped with a reverse-thrust unit, and the remaining stations are equipped with stirring units; In the 7th column, the 8th and 14th stations are equipped with push-type units, the Nth station is equipped with a discharge-type unit, and the remaining stations are equipped with stirring units; In the 8th column, the 8th and 14th stations are installed with push-type units, the Nth station is installed with a reverse-thrust unit, and the remaining stations are installed with stirring units.

[0057] As can be seen above, in each column, the number of pusher units can be two, separated by six stirring units, to ensure continuous and uniform material flow and avoid localized blockages or stagnation. Furthermore, the number of pusher units installed increases by one with each column, so that the number of pusher units increases stepwise as the number of columns increases. This adapts to the flow requirements of different sections and improves processing efficiency.

[0058] The present invention further provides a thin layer drying device, comprising the scraper assembly of the above embodiment, and further comprising: The rotor 400 , and the scraper assembly is mounted on the rotor 400 .

[0059] The embodiments described above are only used to illustrate the technical ideas and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. The scope of the patent application of the present invention cannot be limited by these embodiments alone. That is, any equivalent changes or modifications made according to the spirit disclosed by the present invention still fall within the patent scope of the present invention.

Claims

1. A scraper assembly, characterized in that: include: Folding lines (100a-100g), wherein the folding lines (100a-100g) form a first angle α with the feeding direction X, and the opening direction faces away from the feeding direction X; a mounting portion (200), the mounting portion (200) being connected to a first side of the folding line (100a-100g), the mounting portion (200) being used to connect to a rotor (400); a blade portion (300a-300g), the blade portion (300a-300g) being connected to a second side of the folding line (100a-100g), and forming a second angle β between the blade portion (300a-300g) and the mounting portion (200); The scraper assembly has at least two structural units: Propulsion units: Contains two folding lines (100a, 100b) with α = 45°; The angle β of the corresponding two blade portions (300a, 300b) is 45°, and the opening direction is in the same direction as the rotor rotation direction W; Reverse thrust unit: It includes a folding line (100c) with α=45° and a folding line (100d) with α=0°; The angle β of the corresponding two blade portions (300c, 300d) is 45°, and the opening direction is in the same direction as the rotor rotation direction W; Stirring unit: Contains two fold lines (100e, 100f) with α = 0°; The angle β of the corresponding two blade portions (300e, 300f) is 45°, and the opening direction is in the same direction as the rotor rotation direction W; Discharge unit: Contains a fold line with α = 45° (100g); The corresponding blade portion (300g) has an angle of β=30°, and the opening direction is opposite to the rotor rotation direction W.

2. The scraper assembly according to claim 1, wherein The plurality of structural units are arranged in a plurality of rows along the circumferential direction of the rotor (400), and each row is arranged at intervals along the feed direction X, and the feed direction X coincides with the axial centerline of the rotor (400).

3. The scraper assembly according to claim 2, wherein: The multiple columns are divided into odd columns and even columns, and each column is sequentially provided with the 1st to Nth stations along the feeding direction X; The Nth station of each odd-numbered column is equipped with a discharge unit; The Nth station of each even-numbered column is equipped with a reverse thrust unit.

4. The scraper assembly according to claim 3, wherein: For the odd-numbered nth column, the installation position of the propulsion unit satisfies: Exclude the 1st to 2nd stations, and the (N-1)th to Nth stations; Install push-type units at stations [(n-1) / 2 -1], [(n-1) / 2 +5], and [(n-1) / 2 +11].

5. The scraper assembly according to claim 3, wherein: For an even-numbered nth column, the installation position of the pusher unit satisfies: Exclude the 1st to 2nd workstations and the Nth workstation; Install push-type units at stations [n / 2 -2], [n / 2 +4], and [n / 2 +10].

6. The scraper assembly according to claim 1, wherein: In the push-type unit, the reverse-thrust unit and the stirring unit, the two blade portions (300a-300f) are spaced apart along the feeding direction X.

7. The scraper assembly according to claim 1, wherein: The blade portions (300a-300g) are T-shaped.

8. The scraper assembly according to claim 1, wherein: The push-type units increase in steps as the number of columns increases.

9. The scraper assembly according to claim 1, wherein: The blade portion (300a-300g) is a stainless steel composite plate, comprising: The base layer is carbon steel; The composite layer is alloy steel.

10. A thin layer drying device, characterized in that: The scraper assembly according to any one of claims 1 to 9 further comprises: A rotor (400), wherein the scraper assembly is mounted on the rotor (400).

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