A segmented roasting rotary kiln and a method for preparing ceramsite

Abstract

The present application relates to the technical field of ceramsite preparation, and discloses a segmented roasting rotary kiln and a method for preparing ceramsite. The segmented roasting rotary kiln comprises: a kiln body; a plurality of main plates, spaced circumferentially along the inner wall of the kiln body, with the main plates located in the same circle forming a group, and multiple groups spaced axially along the kiln body; a rotating shaft, corresponding one-to-one with the main plates, fixedly connected to the main plates, rotatably mounted on the kiln body, with the length direction of the rotating shaft being the same as the radial direction of the kiln body; and a control assembly mounted on the kiln body for controlling the rotation angle of the rotating shaft. The present application can flexibly adjust the actual effective length of each functional area in the kiln body, thereby improving the efficiency of ceramsite roasting.

Description

Technical Field

[0001] The present application relates to the technical field of ceramsite preparation, and in particular to a segmented roasting rotary kiln and a method for preparing ceramsite. Background Art

[0002] The effects of different types of sludge (such as municipal sewage sludge, industrial sludge, etc.) on the performance of ceramsite are studied. The specific production methods and processes of ceramsite are as follows: 1) Raw material collection and pretreatment: It is necessary to collect various types of sludge samples and carry out pretreatment work such as dehydration, drying, and crushing to provide qualified raw materials for subsequent preparation; 2) Ratio design and mixed molding: According to the results of previous research, a reasonable raw material ratio scheme is designed, and the pretreated sludge and additives are mixed evenly in proportion, and ceramsite blanks are made by extrusion or rolling molding; 3) High-temperature roasting and cooling: The ceramsite blank is sent to the roasting rotary kiln for roasting, so that physical and chemical changes occur inside the ceramsite to form a stable porous structure. After roasting, it is cooled naturally or forcedly; 4) Performance testing and optimization: The calcined sludge ceramsite is subjected to performance testing and evaluation. According to the test results, the parameters such as raw material ratio and preparation process are adjusted and optimized to improve the performance indicators of sludge ceramsite.

[0003] The production process utilizes a segmented roasting rotary kiln, with the kiln body divided axially into preheating, roasting, and cooling sections. The temperature and atmosphere in each section are independently controlled, enabling the ceramsite production process to follow a "gradient heating, high-temperature roasting, and rapid cooling" process. The lengths and temperatures of the preheating, roasting, and cooling sections within the kiln are generally fixed, but the raw material properties (such as pellet size and moisture content) vary among sludge samples. Sludge samples with high moisture content require a longer roasting cycle, potentially requiring multiple roasting cycles, and efficiency needs to be improved. Summary of the Invention

[0004] In order to adjust the length and temperature of each section in real time according to the raw material characteristics (such as pellet size and moisture content) and shorten the roasting cycle, the present application provides a segmented roasting rotary kiln and a method for preparing ceramsite.

[0005] In the first aspect, the present application provides a segmented roasting rotary kiln, which adopts the following technical solution:

[0006] A segmented roasting rotary kiln comprising:

[0007] kiln body;

[0008] A plurality of main boards are arranged at intervals along the inner wall of the kiln body in the circumferential direction, the main boards located in the same circle are a group, and a plurality of groups are arranged at intervals along the axial direction of the kiln body;

[0009] A rotating shaft corresponds to the main board one by one, the main board and the rotating shaft are fixedly connected, the rotating shaft is rotatably mounted on the kiln body, and the length direction of the rotating shaft is the same as the radial direction of the kiln body;

[0010] A control component, mounted on the kiln body and used to control the rotation angle of the rotating shaft;

[0011] The side wall of the main board close to the inner wall of the kiln body is an arc surface, the diameter of the arc surface is the same as the diameter of the inner wall of the kiln body, and when the length direction of the main board is perpendicular to the axial direction of the kiln body, the arc surface of the main board fits on the inner wall of the kiln body.

[0012] By adopting the above technical solution, multiple groups of main boards are arranged at intervals along the circumferential direction of the inner wall of the kiln body. Each group of main boards is connected to the kiln body through a rotating shaft, and the rotation angle of the rotating shaft is controlled by the control component. This design allows the main board to adjust its posture according to needs. When the length direction of the main board is the same as the axial direction of the kiln body, it can guide the ceramsite material to move smoothly in the kiln body; when the main board is rotated so that the length direction is perpendicular to the axial direction of the kiln body, it can act as a fire wall; in this way, the actual effective length of each functional area in the kiln body can be flexibly adjusted according to the different raw material characteristics (such as the moisture content of the sludge sample), such as lengthening or shortening the roasting section. When processing sludge samples with a high moisture content, a longer roasting section can be formed by rotating the main board, extending the residence time of the material in the high-temperature area, meeting its longer roasting cycle requirements, avoiding multiple roastings, and thus significantly improving production efficiency;

[0013] The multiple main plates increase the contact area between the kiln's inner wall and the material. As the kiln rotates, the main plates continuously turn the material, ensuring a more even distribution within the kiln and greater exposure to the heat. Compared to traditional fixed-structure kilns, the material is heated more evenly, helping to improve the consistency of ceramsite product quality and reduce product defects caused by uneven local heating, such as inconsistent ceramsite strength and uneven internal pore structure.

[0014] When the arc surface of the main board is completely in contact with the inner wall of the kiln body, a single main board is close to the inner wall of the kiln body to block the hot air. The main boards in the same circle group form an incompletely closed fire wall. The length between two adjacent fire walls is the length of a section. The length of each section can be adjusted in real time according to the characteristics of the raw materials (such as particle size and moisture content). When the site direction of the main board is the same as the axial direction of the kiln body, the main board passes through the arc surface. The distance between the main board and the inner wall of the kiln body can prevent the main board from rubbing against the inner wall of the kiln body when rotating, thereby reducing equipment wear and extending the service life of the main board and the kiln body.

[0015] Optionally, the main board is rotatably mounted with an adjustment plate and a reset member that drives the adjustment plate to always rotate toward the inner wall of the kiln body. When the length direction of the main board is the same as the axial direction of the kiln body, the reset member drives the adjustment plate to fit against the inner wall of the kiln body. When the main board rotates along with the rotating shaft, the adjustment plate rotates away from the inner wall of the kiln body.

[0016] By adopting the above technical solution, the main board is rotated to install the adjustment plate and the reset part. When the length direction of the main board is consistent with the axial direction of the kiln body, the reset part drives the adjustment plate to fit the inner wall of the kiln body. At this time, the adjustment plate can assist the main board to better guide the movement of materials. When the main board rotates with the rotating shaft, the adjustment plate rotates away from the inner wall of the kiln body, so that the main board gradually transitions and fits the inner wall of the kiln body. The adjustment plate can also play a certain scraping role during the rotation process to reduce the adhesion of materials to the main board.

[0017] Optionally, an additional plate is provided on the end surface of the main board opposite to the arc surface, and an angle is formed between the main board and the additional plate.

[0018] By adopting this technical solution, when the material contacts the main plate, the additional plate can provide additional flipping and pushing of the material. Compared to a simple main plate structure, the movement trajectory of the material under the action of the additional plate is more complex, allowing for more thorough contact and mixing with the heat field. As the material moves from the kiln tail to the kiln head, the additional plate can lift the material and change its direction of movement, increasing its residence time in the air and allowing it to fully exchange heat with the hot air, promoting more complete physical and chemical reactions within the material, and thus improving the internal structure, quality, and performance of the ceramsite.

[0019] Optionally, the additional plate is rotatably mounted on the main board, and when the adjustment plate rotates downward, the adjustment plate pushes the additional plate to rotate, thereby increasing the angle between the main board and the additional plate.

[0020] By adopting the above technical solution, when the main board forms a fire barrier, the additional plate also forms a part of the fire barrier. At the same time, the adjustment plate rotates downward, and the adjustment plate pushes the additional plate to rotate to increase the angle between the main board and the additional plate, which can also increase the fire barrier area in terms of fire blocking.

[0021] Optionally, the control component includes:

[0022] a first driving wheel, the first driving wheel being coaxially sleeved on the outer wall of the kiln body, and having teeth distributed on an axial end surface of the first driving wheel;

[0023] a first driven gear, located outside the kiln body and meshing with the teeth of the first driving wheel, wherein the first driven gear is coaxially fixedly connected to the rotating shaft;

[0024] The first unlocking member is used to fix or unlock the first driving wheel.

[0025] By adopting this technical solution, the operator can control the first unlocking member to determine whether the first driving wheel drives the first driven gear to rotate, thereby achieving the start and stop rotation of the main plate and adjusting the angle. For example, when the length of the roasting section needs to be adjusted, the first unlocking member can be operated to rotate the first driving wheel to the corresponding angle. The first driven gear then drives the rotating shaft and the main plate to the appropriate position, achieving precise division of functional areas within the kiln to meet the roasting process requirements of different materials.

[0026] Optionally, an extension rod is further included, which is slidably installed along the length direction of the main board, and a plurality of stirring rods are arranged at intervals on the extension rod.

[0027] By adopting the above technical solution, the extension rod is slidably installed along the length direction of the main board and is equipped with multiple stirring rods. When the kiln body rotates, the extension rod and the stirring rod move together with the main board; the stirring rod can stir the material to prevent material accumulation and caking, so that the material maintains good fluidity in the kiln; for some raw materials with high viscosity or easy to agglomerate, the stirring effect of the stirring rod is particularly important, which can ensure that the material is heated evenly and improve the roasting effect; at the same time, by controlling the sliding position of the extension rod, the range of action of the stirring rod in the kiln can be adjusted to adapt to different material quantities and material distribution conditions, further enhancing the control ability of material transportation and roasting process.

[0028] Optionally, one end of the extension rod is inserted into the main board, a driving gear is rotatably installed in the main board, the extension rod is connected to a rack for meshing with the driving gear, the driving gear is connected to a drive shaft, the drive shaft passes through the rotating shaft, the drive shaft extends out of the kiln body and is coaxially connected to a second driven gear, the outer wall of the kiln body is rotatably connected to a second driving wheel, the axial end face of the second driving wheel is provided with teeth for meshing with the second driven gear, and a second unlocking member is installed outside the kiln body for fixing or unlocking the second driving wheel.

[0029] By adopting the above technical solution, the movement of the extension rod and the stirring rod can be controlled independently of the rotation of the main board. For example, during the material conveying process, the second unlocking member can be controlled according to the specific conditions of the material, so that the second driving wheel drives the second driven gear and the drive shaft to rotate, and then the extension rod is driven to slide through the driving gear and rack, thereby adjusting the position and stirring frequency of the stirring rod, thereby better adapting to different material characteristics and kiln working conditions, and realizing fine adjustment of the material stirring and conveying process.

[0030] It can also achieve coordinated control of the mainboard posture adjustment and the movement of the extension rod and the stirring rod. The operator can control the first unlocking member and the second unlocking member respectively according to actual production needs, so that the mainboard is rotated to the appropriate angle to form the required functional area in the kiln, and at the same time adjust the working status of the extension rod and the stirring rod, such as stirring frequency, stirring depth, etc.; this multi-component coordinated control method greatly improves the adaptability of the rotary kiln to different raw materials and process requirements, and can achieve efficient and stable ceramsite roasting production under various working conditions, thereby improving product quality and production efficiency.

[0031] In a second aspect, the present application provides a method for preparing ceramsite, which adopts the following technical solution:

[0032] A method for preparing ceramsite comprises the following steps:

[0033] S1, raw material collection and pretreatment;

[0034] S2, ratio design and mixed molding;

[0035] S3. The ceramsite is roasted using the above-mentioned segmented roasting rotary kiln. When the length direction of the main board is the same as the axial direction of the kiln body, the main board mainly plays a guiding role for the ceramsite. When the length direction of the main board and the axial direction of the kiln body are perpendicular to each other, the main board mainly plays the role of a firewall. According to the moisture content of the sludge sample, the main boards of different groups are rotated to form a fire wall, thereby achieving the effect of lengthening or shortening the roasting section.

[0036] S4, cooling treatment;

[0037] S5. Performance testing.

[0038] By adopting this technical solution, after S1 raw material collection and pretreatment and S2 mix design and mixing, different groups of mainboards are rotated to form fire walls during the S3 calcination step, depending on the raw material characteristics such as the moisture content of the sludge sample, allowing the calcination section length to be flexibly adjusted. For sludge samples with high moisture content, extending the calcination section ensures adequate drying and calcination; for samples with low moisture content, shortening the calcination section prevents over-calcination, improving production efficiency and ensuring product quality. After S4 cooling and S5 performance testing, the resulting ceramsite product has more stable performance and higher quality.

[0039] In summary, this application has at least one of the following beneficial effects:

[0040] 1. This segmented roasting rotary kiln is equipped with multiple sets of rotatable main boards and cooperates with control components to adjust the actual effective length of each functional area in the kiln (such as preheating section, roasting section, cooling section) in real time according to the characteristics of the raw materials (such as the pellet size and moisture content of the sludge sample);

[0041] 2. The rotary kiln further optimizes the material transportation and roasting process in the kiln through the design of the adjustment plate, additional plate, sliding extension rod and stirring rod on the main board. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the present application;

[0043] Figure 2 This is a schematic diagram of the overall internal structure of Example 1 of the present application;

[0044] Figure 3 is a partial cross-sectional view of Example 1 of the present application;

[0045] Figure 4 This is a schematic diagram of the overall structure of the control component in accordance with the first embodiment of the present application;

[0046] Figure 5 This is a cross-sectional view of the first embodiment of the present application showing that the main board forms a fire retaining wall in the kiln body;

[0047] Figure 6 This is a schematic diagram of a partial explosion structure of the first unlocking member and the protective cover in accordance with the first embodiment of the present application;

[0048] Figure 7 This is a schematic diagram of the overall structure of the mainboard of Example 1 of the present application;

[0049] Figure 8 This is a partial exploded diagram of the mainboard of Example 1 of the present application;

[0050] Figure 9 This is a schematic diagram of the connection relationship between the main board and the additional board in Example 1 of the present application;

[0051] Figure 10 This is a schematic structural diagram of the adjustment plate driving the additional plate to rotate in Example 1 of the present application;

[0052] Figure 11 yes Figure 5 A magnified schematic diagram of point A;

[0053] Figure 12 This is a schematic diagram of the mainboard structure of the second embodiment of the present application;

[0054] Figure 13 This is a cross-sectional view of the internal structure of the mainboard of the second embodiment of the present application;

[0055] Figure 14 This is a schematic diagram of the partial explosion structure of the second unlocking member and the protective cover in accordance with the second embodiment of the present application.

[0056] Explanation of reference numerals: 100, kiln body; 200, driving mechanism; 210, large ring gear; 220, gear; 230, motor; 300, supporting mechanism; 310, supporting seat; 320, pulley; 330, supporting roller; 400, main board; 410, arc surface; 420, adjusting plate; 430, first torsion spring; 440, round rod; 450, additional plate; 460, connecting rod; 470, second torsion spring; 480, mounting groove; 490, driving gear; 491, driving shaft; 492, second driven gear ;493, second driving wheel; 500, rotating shaft; 600, control assembly; 610, first driving wheel; 620, first driven gear; 630, first unlocking member; 631, first positioning block; 632, first screw; 633, first nut; 700, protective cover; 710, first stroke groove; 720, second stroke groove; 800, extension rod; 810, stirring rod; 820, rack; 900, second unlocking member; 910, second positioning block; 920, second screw; 930, second nut. DETAILED DESCRIPTION

[0057] The following is combined with Figure 1 -Attached Figure 14 This application is described in further detail. Example

[0058] Reference Figure 1 The segmented roasting rotary kiln of this embodiment includes a kiln body 100, a driving mechanism 200 for driving the kiln body 100 to rotate, and a supporting mechanism 300 for supporting the kiln body 100. The driving mechanism 200 mainly includes a large gear ring 210 fixedly mounted on the outer wall of the kiln body 100, a gear 220 for meshing with the large gear ring 210, and a motor 230 for driving the gear 220 to rotate. The supporting mechanism 300 includes a support seat 310, a pulley 320 fixedly mounted on the outer wall of the kiln body 100, a supporting wheel 330 mounted on the support seat 310 for cooperating with the pulley 320, and the motor 230 is also mounted on the support seat 310. The driving mechanism 200 and the supporting mechanism 300 are mainly existing technologies and will not be described in detail in this application. The kiln body 100 is cylindrical and made of high-temperature resistant alloy steel. The interior is divided into a preheating section, a roasting section, and a cooling section along the axial direction, and each section corresponds to different temperature control requirements.

[0059] Reference Figure 2 and Figure 3The segmented roasting rotary kiln also includes a main board 400, a rotating shaft 500, and a control assembly 600. On the inner wall of the kiln body 100, main boards 400 are evenly spaced along the circumference. In the embodiment of the present application, 8 main boards 400 form a group. A total of multiple groups are arranged along the axial direction of the kiln body 100. In the embodiment of the present application, 6 groups are arranged. The main board 400 and the control assembly 600 are key components. Each main board 400 corresponds to a rotating shaft 500. The main board 400 and the rotating shaft 500 are fixedly connected. The rotating shaft 500 is sealed and rotatably mounted on the kiln body 100, and the length direction of the rotating shaft 500 is the same as the radial direction of the kiln body 100. The control assembly 600 is installed on the kiln body 100 and is used to control the rotation angle of the rotating shaft 500.

[0060] Each main board 400 is a rectangular plate-shaped structure, and one side wall close to the inner wall of the kiln body 100 is processed into a circular arc surface 410. The diameter of the circular arc surface 410 is the same as the diameter of the inner wall of the kiln body 100. When the length direction of the main board 400 is toward the axial direction of the kiln body 100, there is a distance of 5-10 mm between the circular arc surface 410 and the inner wall of the kiln body 100 to ensure smooth rotation of the main board 400.

[0061] Reference Figure 4 The control assembly 600 includes a first driving wheel 610, a first driven gear 620, and a first unlocking member 630. The first driving wheel 610 is coaxially sleeved on the outer wall of the kiln body 100, and its axial end surface is provided with teeth. The first driven gear 620 is located outside the kiln body 100 and meshes with the teeth of the first driving wheel 610. The first driven gear 620 is coaxially fixedly connected to the rotating shaft 500, and the first driven gear 620 and the rotating shaft 500 correspond one to one. The first unlocking member 630 is mounted on the first driving wheel 610 and is used to fix or unlock the first driving wheel 610.

[0062] Reference Figure 3 The control assembly 600 primarily enables the mainboard 400 to rotate in two primary states within the kiln body 100. In the first state, the mainboard 400's length aligns with that of the kiln body 100. In this state, as the kiln body 100 rotates, the mainboard 400 fulfills its vital functions of guiding and lifting materials, directing their orderly movement within the kiln body 100 and ensuring they are fully lifted during rotation, facilitating full contact between the materials and the hot air, thereby enhancing heat exchange efficiency.

[0063] Reference Figure 5 When the main plate 400 rotates to the second position, its arc surface 410 will fit tightly against the inner wall of the kiln body 100. At this point, the main plate 400 acts like a fire barrier, effectively blocking the direct impact of flames and heat, and regulating the temperature distribution within the kiln body 100 and the heating of the materials.

[0064] Reference Figure 6Specifically, the first unlocking member 630 includes a first positioning block 631, a first screw 632 fixedly mounted on the first positioning block 631, and a first nut 633. The first positioning block 631 is fixedly mounted on the first driving wheel 610. A protective cover 700 is fixedly mounted on the outer wall of the kiln body 100. The protective cover 700 defines a first travel slot 710. The first positioning block 631 is located within the protective cover 700. The first screw 632 extends outside the protective cover 700 through the first travel slot 710. The distance that the first travel slot 710 extends along the circumference of the kiln body 100 corresponds to the rotational travel of the first driving wheel 610. By pushing the first screw 632, the first driving wheel 610 is rotated. When the first screw 632 abuts one end of the first travel slot 710, the main board 400 is in a first state. When the first driving wheel 610 is rotated so that the first screw 632 abuts the other end of the first travel slot 710, the main board 400 is in a second state. The first nut 633 is then threadedly connected to the first screw 632, pressing the first nut 633 against the sidewall of the protective cover 700, thereby securing the first driving wheel 610. Once the first driving wheel 610 is secured, the mainboard 400 can remain in either the first or second state. The protective cover 700 limits the rotational range of the first driving wheel 610, controlling the rotation of the rotating shaft 500 to only 90°. The protective cover 700 also provides protective coverage for the first driving wheel 610 and the first driven gear 620.

[0065] Reference Figure 7 Furthermore, the main plate 400 is rotatably mounted with an adjustment plate 420, along with a reset member that forces the adjustment plate 420 to rotate toward the inner wall of the kiln body 100. Two adjustment plates 420 are provided, located on opposite sides of the main plate 400. A round rod 440 is fixedly mounted on the main plate 400, and the adjustment plate 420 is rotatably mounted on the rod 440. The central axis of the rod 440 is perpendicular to the central axis of the rotating shaft 500.

[0066] Reference Figure 8 The reset member is a first torsion spring 430, which is sleeved on the round rod 440. One end of the first torsion spring 430 is fixedly abutted against the surface of the main board 400, and the other end of the first torsion spring 430 is fixedly installed on the adjustment plate 420, so that the adjustment plate 420 always has a tendency to abut against the inner wall of the kiln body 100. When the length direction of the main board 400 is the same as the axial direction of the kiln body 100, the end of the adjustment plate 420 close to the inner wall of the kiln body 100 is a flat surface and tangent to the inner wall of the kiln body 100.

[0067] When the main plate 400 rotates along with the rotating shaft 500 , the regulating plate 420 rotates away from the inner wall of the kiln body 100 , and can also play a certain scraping role during the rotation process to prevent the material from adhering to the main plate 400 .

[0068] Reference Figure 9An additional plate 450 is disposed on the end face of the main plate 400 opposite the arcuate surface 410. A connecting rod 460 is connected to the main plate 400, rotatably connecting the connecting rod 460 and the additional plate 450. A second torsion spring 470 is mounted on the connecting rod 460, which drives the additional plate 450 to adhere to the additional plate 450, forming a right angle between the main plate 400 and the additional plate 450. When the material contacts the main plate 400, the additional plate 450 can further flip and push the material, making its movement trajectory more complex and allowing it to more fully contact and mix with the heat field.

[0069] Reference Figure 10 and Figure 11 Since the additional plate 450 is rotatably installed on the main plate 400, when the main plate 400 rotates to act as a fire barrier, the arc surface 410 of the main plate 400 fits against the inner wall of the kiln body 100, and the adjustment plate 420 moves away from the inner wall of the kiln body 100. The adjustment plate 420 pushes the additional plate 450 to rotate and increases the angle between the additional plate 450 and the main plate 400, which can also increase the fire barrier area in terms of fire blocking.

[0070] The implementation principle of a segmented roasting rotary kiln in Example 1 of the present application is:

[0071] In actual operation, the control assembly 600 rotates different groups of main plates 400 based on the raw material characteristics (such as pellet size and moisture content), forming a fire barrier and thereby lengthening or shortening the roasting section. For example, when processing sludge samples with a high moisture content, the second and fifth groups of main plates 400 are rotated to form a longer roasting section, extending the material's residence time in the high-temperature zone, meeting the requirement for a longer roasting cycle, avoiding multiple roasting cycles, and improving production efficiency. Example

[0072] The second embodiment of a segmented roasting rotary kiln is based on the first embodiment, with the addition of an extension rod 800 and its associated control structure to the main plate 400. The structure and connection relationship of the kiln body 100, main plate 400, rotating shaft 500, and control assembly 600 are the same as those of the first embodiment.

[0073] Reference Figure 12 The extension rod 800 has the same length as the main plate 400, and a plurality of stirring rods 810 are spaced apart along the length of the extension rod 800. When the kiln body 100 rotates, the extension rod 800 and the stirring rods 810 move with the main plate 400. The stirring rods 810 stir the material, preventing accumulation and agglomeration, and maintaining good fluidity within the kiln.

[0074] Reference Figure 12 and Figure 13One end of the extension rod 800 is inserted into the main board 400, and a mounting groove 480 is provided in the main board 400. The mounting groove 480 passes through the opening of the outer wall of the main board 400 and is only for the stirring rod 810 and the extension rod 800 to pass through. The main board 400 is rotatably installed with a driving gear 490 in the mounting groove 480, and the end of the extension rod 800 extending into the mounting groove 480 is provided with a rack 820 for engaging with the driving gear 490. The driving gear 490 is connected to a drive shaft 491, which passes through the rotating shaft 500. The drive shaft 491 extends out of the kiln body 100 and is coaxially connected to a second driven gear 492. In order to allow the driving gear 490 to be installed in the main board 400, the main board 400 of the second embodiment is relatively thick, and the main board 400 can be spliced and fixed in half to facilitate the installation of the driving gear 490.

[0075] Reference Figure 14 A second driving wheel 493 is rotatably connected to the outer wall of the kiln body 100. One axial end surface of the second driving wheel 493 is provided with teeth for meshing with the second driven gear 492. A second unlocking member 900 is mounted on the outside of the kiln body 100 for securing or unlocking the second driving wheel 493. The second unlocking member 900 includes a second positioning block 910, a second screw 920, and a second nut 930.

[0076] A second positioning block 910 is fixedly mounted on the other axial end face of the second driving wheel 493. The second positioning block 910 slides along the outer wall of the kiln body 100 as the second driving wheel 493 rotates. The protective cover defines a second travel slot 720. The second positioning block 910 is positioned within the protective cover 700. One end of the second screw 920 extends outside the protective cover 700 through the second travel slot 720. The length of the second travel slot 720 extending circumferentially along the kiln body 100 is equal to the rotational travel of the second driving wheel 493.

[0077] When the second screw 920 abuts against the wall of one end of the second travel groove 720, the second nut 930 presses against the protective cover 700, the extension rod 800 extends the longest distance out of the main board 400, and the stirring rod 810 on the extension rod 800 closest to the main board 400 blocks the notch of the installation groove 480. When the second screw 920 abuts against the wall of the other end of the second travel groove 720, the second nut 930 presses against the protective cover 700, the extension rod 800 is stored in the main board 400, and the stirring rod 810 on the extension rod 800 farthest from the main board 400 blocks the notch of the installation groove 480.

[0078] The implementation principle of a segmented roasting rotary kiln in Example 2 of the present application is:

[0079] The operator can rotate the second driving wheel 493 according to the specific material conditions. This second driving wheel 493 drives the second driven gear 492 and the drive shaft 491 to rotate. This, in turn, drives the extension rod 800 through the cooperation of the driving gear 490 and the rack 820 to slide and adjust the position of the stirring rod 810 to better adapt to different material characteristics and kiln operating conditions. For example, when the material volume is large or unevenly distributed, the position of the extension rod 800 can be adjusted to ensure that the stirring rod 810 fully stirs the material and ensures uniform heating of the material. Simultaneously, the operator can rotate the first driving wheel 610 and the second driving wheel 493 according to actual production needs, rotating the main board 400 to the appropriate angle to form the desired functional area within the kiln. The operator can also adjust the operating conditions of the extension rod 800 and the stirring rod 810, such as the stirring frequency and stirring depth. This greatly improves the rotary kiln's adaptability to different raw materials and process requirements, enabling efficient and stable ceramsite roasting production under various operating conditions, improving product quality and production efficiency. Example

[0080] This embodiment 3 discloses a method for preparing ceramsite. The method for preparing ceramsite comprises the following steps:

[0081] S1. Raw material collection and pretreatment: Collect various types of sludge samples, such as urban sewage sludge, industrial sludge, etc., and perform pretreatment work such as dehydration, drying, and crushing on the collected sludge samples to provide qualified raw materials for subsequent preparation.

[0082] S2. Ratio design and mixed molding: Based on the results of previous research, design a reasonable raw material ratio plan.

[0083] S3. Use the above-mentioned segmented roasting rotary kiln to roast the ceramsite: send the prepared ceramsite blank into the segmented roasting rotary kiln for roasting. When the length direction of the main board 400 is the same as the axial direction of the kiln body 100, the main board 400 mainly plays a guiding role for the ceramsite, allowing the ceramsite material to move smoothly in the kiln body 100; when the length direction of the main board 400 and the axial direction of the kiln body 100 are perpendicular to each other, the main board 400 mainly plays the role of a firewall. According to the moisture content of the sludge sample, the main boards 400 of different groups are rotated to form a fire wall, thereby achieving the effect of lengthening or shortening the roasting section. For example, for sludge samples with a high moisture content, rotating the main board 400 forms a longer roasting section, extending the residence time of the material in the high-temperature area, ensuring its sufficient drying and roasting; for samples with a low moisture content, shortening the roasting section can avoid over-roasting and improve production efficiency. During the firing process, parameters such as the temperature and atmosphere in the kiln body 100 can be independently controlled as needed to achieve a process path of "gradient heating-high temperature firing-rapid cooling" for the ceramsite.

[0084] S4. Cooling: After the roasting is completed, the ceramsite is cooled. Cooling can be done by natural cooling or forced cooling.

[0085] S5. Performance Testing: After cooling, the sludge ceramsite is tested and evaluated. Testing may include performance indicators such as strength, internal pore structure, and water absorption. Based on the test results, parameters such as the raw material ratio and preparation process are adjusted and optimized to improve the performance of the sludge ceramsite.

[0086] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A segmented roasting rotary kiln, characterized in that: include: kiln body (100); A plurality of main boards (400) are arranged at intervals along the inner wall of the kiln body (100) in the circumferential direction, the main boards (400) located in the same circle are grouped together, and a plurality of groups are arranged at intervals along the axial direction of the kiln body (100); The rotating shaft (500) corresponds to the main board (400) in a one-to-one manner. The main board (400) and the rotating shaft (500) are fixedly connected. The rotating shaft (500) is rotatably mounted on the kiln body (100). The length direction of the rotating shaft (500) is the same as the radial direction of the kiln body (100). A control component (600) is installed on the kiln body (100) and is used to control the rotation angle of the rotating shaft (500); A side wall of the main plate (400) close to the inner wall of the kiln body (100) is an arc surface (410), and the diameter of the arc surface (410) is the same as the diameter of the inner wall of the kiln body (100). When the length direction of the main plate (400) is perpendicular to the axial direction of the kiln body (100), the arc surface (410) of the main plate (400) is in contact with the inner wall of the kiln body (100); The main board (400) is rotatably mounted with an adjusting plate (420), and a reset member that drives the adjusting plate (420) to always have a rotational tendency toward the inner wall of the kiln body (100); when the length direction of the main board (400) is the same as the axial direction of the kiln body (100), the reset member drives the adjusting plate (420) to fit against the inner wall of the kiln body (100); when the main board (400) rotates along with the rotating shaft (500), the adjusting plate (420) rotates in a direction away from the inner wall of the kiln body (100).

2. A segmented roasting rotary kiln according to claim 1, characterized in that: An additional plate (450) is provided on the end surface of the main plate (400) opposite to the arc surface (410), and an angle is formed between the main plate (400) and the additional plate (450).

3. A segmented roasting rotary kiln according to claim 2, characterized in that: The additional plate (450) is rotatably mounted on the main plate (400); when the adjustment plate (420) rotates downward, the adjustment plate (420) pushes the additional plate (450) to rotate, thereby increasing the angle between the main plate (400) and the additional plate (450).

4. The segmented roasting rotary kiln according to claim 1, characterized in that: The control component (600) includes: a first driving wheel (610), the first driving wheel (610) being coaxially sleeved on the outer wall of the kiln body (100), and having teeth distributed on an axial end surface of the first driving wheel (610); a first driven gear (620) located outside the kiln body (100) and meshing with the teeth of the first driving wheel (610); the first driven gear (620) and the rotating shaft (500) are coaxially fixedly connected; The first unlocking member (630) is used to fix or unlock the first driving wheel (610).

5. A segmented roasting rotary kiln according to claim 4, characterized in that: It also includes an extension rod (800) that is slidably installed along the length direction of the main board (400), and a plurality of stirring rods (810) are arranged at intervals on the extension rod (800).

6. The segmented roasting rotary kiln according to claim 5, characterized in that: One end of the extension rod (800) is inserted into the main board (400), and a driving gear (490) is rotatably installed in the main board (400). The extension rod (800) is connected to a rack (820) for engaging with the driving gear (490). The driving gear (490) is connected to a drive shaft (491), and the drive shaft (491) passes through the rotating shaft (500). The drive shaft (491) extends out of the kiln body (100) and is coaxially connected to a second driven gear (492). The outer wall of the kiln body (100) is rotatably connected to a second driving wheel (493), and the axial end surface of the second driving wheel (493) is provided with teeth for engaging with the second driven gear (492). A second unlocking member (900) is installed outside the kiln body (100) for fixing or unlocking the second driving wheel (493).

7. A method for preparing ceramsite, characterized in that: The following steps are included: S1, raw material collection and pretreatment; S2, ratio design and mixed molding; S3. The ceramsite is roasted using the segmented roasting rotary kiln according to claim 1. When the length direction of the main board (400) is the same as the axial direction of the kiln body (100), the main board (400) mainly plays a role of guiding the ceramsite. When the length direction of the main board (400) and the axial direction of the kiln body (100) are perpendicular to each other, the main board (400) mainly plays a role of a fire wall. According to the moisture content of the sludge sample, the main boards (400) of different groups are rotated so that the main boards (400) form a fire wall, thereby achieving the effect of lengthening or shortening the roasting section. S4, cooling treatment; S5. Performance testing.

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