Sectional roasting rotary kiln and ceramsite preparation method

Abstract

The invention relates to the technical field of ceramsite preparation, and discloses a sectional type roasting rotary kiln and a ceramsite preparation method. The multiple main plates are arranged in the circumferential direction of the inner wall of the kiln body at intervals, the main plates located on the same circle form a group, and multiple groups of the main plates are arranged in the axial direction of the kiln body at intervals; the rotating shafts are in one-to-one correspondence with the main plates, the main plates are fixedly connected with the rotating shafts, the rotating shafts are rotationally installed on the kiln body, and the length direction of the rotating shafts is the same as the radial direction of the kiln body; the control assembly is installed on the kiln body and used for controlling the rotating angle of the rotating shaft. The actual effective length of each functional area in the kiln body can be flexibly adjusted, and the ceramsite roasting efficiency is improved.

Description

Technical Field

[0001] This 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] To study the influence of different types of sludge (such as municipal sewage sludge, industrial sludge, etc.) on the properties of ceramsite, the ceramsite production method and process are specifically as follows: 1) Raw material collection and pretreatment: Various sludge samples need to be collected and pretreated such as dehydration, drying, crushing, etc. to provide qualified raw materials for subsequent preparation; 2) Ratio design and mixing molding: According to the previous research results, a reasonable raw material ratio plan is designed, and the pretreated sludge and additives are mixed evenly in proportion, and ceramsite blanks are made by methods such as extrusion or rolling molding; 3) High-temperature roasting and cooling: The ceramsite blanks are sent into a roasting rotary kiln for roasting to cause physical and chemical changes inside the ceramsite to form a stable porous structure. After roasting, natural cooling or forced cooling treatment is carried out; 4) Performance detection and optimization: Performance detection and evaluation work are carried out on the calcined sludge ceramsite, and parameters such as raw material ratio and preparation process are adjusted and optimized according to the detection results to improve the performance indexes of the sludge ceramsite.

[0003] During the production process, a segmented roasting rotary kiln is adopted. The kiln body is axially divided into a preheating section, a roasting section, and a cooling section. The temperature and atmosphere of each section are independently controlled to realize the process path of "gradient heating - high-temperature roasting - rapid cooling" of ceramsite. The lengths and temperatures of the preheating section, roasting section, and cooling section in the kiln body are basically determined. However, the raw material characteristics (such as pellet diameter, moisture content) of various sludge samples are different. The roasting cycle of sludge samples with high moisture content needs to be extended. Therefore, multiple roastings may be required, and the efficiency needs to be improved. Summary of the Invention

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

[0005] In the first aspect, this application provides a segmented roasting rotary kiln, adopting the following technical scheme: A segmented roasting rotary kiln, comprising: A kiln body; Main boards, a plurality of which are circumferentially and spacedly arranged along the inner wall of the kiln body. The main boards in the same circle are a group, and multiple groups are spacedly arranged along the axial direction of the kiln body; Rotating shafts, corresponding to the main boards one by one. The main boards are fixedly connected to the rotating shafts, and the rotating shafts are rotatably installed on the kiln body. The length direction of the rotating shafts is the same as the radial direction of the kiln body; A control component, installed on the kiln body for controlling the rotation angle of the rotating shafts; One side wall of the main board close to the inner wall of the kiln body is an arc surface, and the diameter of the arc surface is the same as that of the inner wall of the kiln body. 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.

[0006] 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 rotationally connected to the kiln body through a rotating shaft, and the rotation angle of the rotating shaft is controlled by a control component. This design enables the main board to adjust its posture as needed. 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 rotates to a position where its length direction is perpendicular to the axial direction of the kiln body, it can act as a fire baffle. Thus, the actual effective length of each functional area in the kiln body can be flexibly adjusted according to different raw material characteristics (such as the moisture content of the sludge sample), for example, lengthening or shortening the roasting section. When processing sludge samples with 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, and avoiding multiple roastings, thereby significantly improving production efficiency. The arrangement of multiple groups of main boards increases the contact area between the inner wall of the kiln body and the material. During the rotation of the kiln body, the main boards can continuously turn the material, making the material more evenly distributed in the kiln and contacting the heat field more fully. Compared with the traditional fixed-structure kiln body, the material is heated more evenly, which helps to improve the consistency of the quality of the ceramsite products and reduce product defects caused by uneven local heating, such as inconsistent ceramsite strength and uneven internal pore structure. When the arc surface of the main board completely fits the inner wall of the kiln body, a single main board closely adheres to the inner wall of the kiln body to block hot air, and the main boards in the same circle form an incompletely closed fire baffle. The length between two adjacent fire baffles is the length of one section, and the length of each section can be adjusted in real time according to raw material characteristics (such as pellet diameter, moisture content). When the field direction of the main board is the same as the axial direction of the kiln body, there is a distance between the main board and the inner wall of the kiln body through the arc surface, which can prevent hard friction between the main board and the inner wall of the kiln body when the main board rotates, reduce equipment wear, and extend the service life of the main board and the kiln body.

[0007] Optionally, an adjusting plate is rotatably installed on the main board, and a resetting member that always drives the adjusting plate to have a tendency to rotate towards 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 resetting member drives the adjusting plate to fit on the inner wall of the kiln body. When the main board rotates along with the rotating shaft, the adjusting plate rotates away from the inner wall of the kiln body.

[0008] By adopting the above technical solution, the main board rotates to install the adjusting plate and the resetting member. When the length direction of the main board is the same as the axial direction of the kiln body, the resetting member drives the adjusting plate to fit against the inner wall of the kiln body. At this time, the adjusting plate can assist the main board to better guide the movement of the material. When the main board rotates along with the rotating shaft, the adjusting plate rotates away from the inner wall of the kiln body, enabling the main board to gradually transition and fit against the inner wall of the kiln body. During the rotation process, the adjusting plate can also play a certain role in scraping the material, reducing the adhesion of the material to the main board.

[0009] Optionally, an additional plate is provided on the end face of the main board opposite to the arc surface, and an included angle is formed between the main board and the additional plate.

[0010] By adopting the above technical solution, when the material contacts the main board, the additional plate can perform additional turning and pushing on the material. Compared with the simple main board structure, under the action of the additional plate, the movement trajectory of the material is more complex, enabling the material to come into contact with and mix with the heat field more fully. During the movement of the material from the kiln tail to the kiln head, the additional plate can lift the material and change its movement direction, increasing the residence time of the material in the air, enabling it to fully exchange heat with the hot gas, and promoting the more complete progress of the physical and chemical reactions inside the material, which is beneficial to improving the internal structure quality and performance of the ceramsite.

[0011] Optionally, the additional plate is rotatably installed on the main board. When the adjusting plate rotates downward, the adjusting plate pushes the additional plate to rotate, increasing the angle between the main board and the additional plate.

[0012] By adopting the above technical solution, when the main board forms a fire baffle wall, the additional plate also forms a part of the fire baffle wall. At the same time, when the adjusting plate rotates downward, the adjusting plate pushes the additional plate to rotate, increasing the angle between the main board and the additional plate, which can also increase the fire baffle area in terms of fire prevention.

[0013] Optionally, the control assembly includes: A first driving wheel coaxially sleeved on the outer wall of the kiln body, with teeth distributed on the axial end face of the first driving wheel; A first driven gear located outside the kiln body and meshing with the teeth of the first driving wheel, and the first driven gear is coaxially and fixedly connected to the rotating shaft; A first unlocking member for fixing or unlocking the first driving wheel.

[0014] By adopting the above technical solution, the operator can control the first unlocking member to determine whether to make the first driving wheel drive the first driven gear to rotate, thereby realizing the start-stop and angle adjustment of the rotation of the main board. For example, when it is necessary to adjust the length of the roasting section, the first driving wheel can be rotated by operating the first unlocking member by a corresponding angle, and the rotating shaft and the main board can be driven by the first driven gear to rotate to a suitable position, realizing the precise division of the functional areas inside the kiln and meeting the roasting process requirements of different materials.

[0015] Optionally, it further includes an extension rod, 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.

[0016] By adopting the above technical solution, the extension rod is slidably installed along the length direction of the main board and is provided with a plurality of stirring rods. When the kiln body rotates, the extension rod and the stirring rods move together with the main board; the stirring rods can stir the materials to prevent the materials from accumulating and caking, so that the materials maintain good fluidity in the kiln; for some raw materials with relatively high viscosity or easy to agglomerate, the stirring function of the stirring rods is particularly important, which can ensure that the materials are heated evenly and improve the roasting effect; at the same time, by controlling the sliding position of the extension rod, the action range of the stirring rods in the kiln can be adjusted to adapt to different material quantities and material distribution conditions, further enhancing the control ability of the material conveying and roasting processes.

[0017] 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 with a rack for meshing with the driving gear, the driving gear is connected with a driving shaft, the driving shaft passes through the rotating shaft, the driving shaft extends outside the kiln body and is coaxially connected with a second driven gear, a second driving wheel is rotatably connected to the outer wall of the kiln body, tooth teeth for meshing with the second driven gear are arranged on the axial end face of the second driving wheel, and a second unlocking member is installed outside the kiln body for fixing or unlocking the second driving wheel.

[0018] By adopting the above technical solution, the movement of the extension rod and the stirring rods can be controlled independently of the rotation of the main board; for example, during the material conveying process, according to the specific situation of the materials, by controlling the second unlocking member, the second driving wheel drives the second driven gear and the driving shaft to rotate, and then the extension rod is driven to slide through the driving gear and the rack, adjusting the position and stirring frequency of the stirring rods, better adapting to different material characteristics and kiln conditions, and realizing the fine adjustment of the material stirring and conveying processes; It can also realize the coordinated control of the main board attitude adjustment and the movement of the extension rod and the stirring rods. The operator can control the first unlocking member and the second unlocking member respectively according to the actual production requirements, so that the main board rotates to a suitable angle to form the required functional area in the kiln, and at the same time adjust the working states of the extension rod and the stirring rods, 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 realize efficient and stable ceramsite roasting production under various working conditions, improving product quality and production efficiency.

[0019] In a second aspect, the present application provides a method for preparing ceramsite, adopting the following technical solution: A method for preparing ceramsite includes the following steps S1. Raw material collection and pretreatment; S2. Ratio design and mixing molding; S3. Use the above-mentioned segmented roasting rotary kiln to roast the ceramsite. 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 role in guiding the ceramsite. When the length direction of the main board is perpendicular to the axial direction of the kiln body, the main board mainly plays the role of a fire wall. According to the moisture content of the sludge sample, rotate the main boards of different groups to form a fire wall, so as to achieve the effect of lengthening or shortening the roasting section; S4. Cooling treatment; S5. Performance detection.

[0020] By adopting the above technical solution, after S1 raw material collection and pretreatment and S2 ratio design and mixing molding, according to the raw material characteristics such as the moisture content of the sludge sample, rotate the main boards of different groups to form a fire wall in the S3 roasting step, and flexibly change the length of the roasting section. For sludge samples with high moisture content, extending the roasting section can ensure their full drying and roasting; for samples with low moisture content, shortening the roasting section can avoid over-roasting, improve production efficiency and ensure product quality. After S4 cooling treatment and S5 performance detection, the finally obtained ceramsite products have more stable performance and higher quality.

[0021] In summary, the present application includes at least one of the following beneficial effects: 1. The segmented roasting rotary kiln can, through the setting of multiple rotatable main boards and in cooperation with the control component, adjust the actual effective lengths of the functional areas (such as the preheating section, roasting section, and cooling section) in the kiln body in real time according to the raw material characteristics (such as the pellet diameter and moisture content of the sludge sample); 2. The rotary kiln further optimizes the conveying and roasting processes of the materials in the kiln through the designs of the adjusting plates, additional plates, slidable lengthening rods, and stirring rods on the main board. Description of the Drawings

[0022] Figure 1 is the overall structural schematic diagram of Embodiment 1 of the present application; Figure 2 is the internal schematic diagram of the overall structure of Embodiment 1 of the present application; Figure 3 is the partial cross-sectional view of Embodiment 1 of the present application; Figure 4 is the overall structural schematic diagram of Embodiment 1 of the present application showing the control component; Figure 5 is the cross-sectional view of Embodiment 1 of the present application showing the main board forming a fire wall in the kiln body; Figure 6 is the partial exploded structural schematic diagram of Embodiment 1 of the present application showing the cooperation of the first unlocking member and the protective cover; Figure 7It is a schematic diagram of the overall structure of the main board in the first embodiment of the present application; Figure 8 It is a schematic diagram of the partial explosion of the main board in the first embodiment of the present application; Figure 9 It is a schematic diagram of the connection relationship structure between the main board and the additional board in the first embodiment of the present application; Figure 10 It is a schematic diagram of the structure in which the adjusting plate drives the additional board to rotate in the first embodiment of the present application; Figure 11 It is Figure 5 The enlarged schematic diagram of part A of Figure 12 It is a schematic diagram of the main board structure in the second embodiment of the present application; Figure 13 It is a cross-sectional view of the internal structure of the main board in the second embodiment of the present application; Figure 14 It is a schematic diagram of the partial explosion structure showing the cooperation between the second unlocking member and the protective cover in the second embodiment of the present application.

[0023] Explanation of reference numerals: 100, kiln body; 200, driving mechanism; 210, large gear ring; 220, gear; 230, motor; 300, supporting mechanism; 310, supporting seat; 320, belt pulley; 330, supporting roller; 400, main board; 410, arc surface; 420, adjusting plate; 430, first torsion spring; 440, round rod; 450, additional board; 460, connecting rod; 470, second torsion spring; 480, installation groove; 490, driving gear; 491, driving shaft; 492, second driven gear; 493, second driving wheel; 500, rotating shaft; 600, control component; 610, first driving wheel; 620, first driven gear; 630, first unlocking member; 631, first positioning block; 632, first screw rod; 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 rod; 930, second nut. Detailed implementation manners

[0024] The following will Figure 1 - be further described in detail with reference to the attached Figure 14 drawings to make a further detailed description of the present application.

[0025] Embodiment 1: Refer to Figure 1, the segmented roasting rotary kiln of this embodiment includes a kiln body 100, a driving mechanism 200 for driving the rotation of the kiln body 100, and a supporting mechanism 300 for supporting the kiln body 100. The driving mechanism 200 mainly includes a large gear ring 210 fixedly installed 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 rotation of the gear 220. The supporting mechanism 300 includes a support base 310, a belt pulley 320 fixedly installed on the outer wall of the kiln body 100, a supporting roller 330 installed on the support base 310 for cooperating with the belt pulley 320, and the motor 230 is also installed on the support base 310. The driving mechanism 200 and the supporting mechanism 300 are mainly prior arts, and this application will not elaborate on them. The kiln body 100 is cylindrical, made of high-temperature resistant alloy steel, and is axially divided into a preheating section, a roasting section, and a cooling section in sequence, with each section corresponding to different temperature control requirements.

[0026] Referring to Figure 2 and Figure 3 , the segmented roasting rotary kiln further includes a main board 400, a rotating shaft 500, and a control component 600. On the inner wall of the kiln body 100, the main boards 400 are evenly spaced along the circumferential direction. In this embodiment of the application, every 8 main boards 400 form a group, and multiple groups are arranged axially along the kiln body 100. In this embodiment of the application, 6 groups are provided. The main board 400 and the control component 600 are key components. Each main board 400 corresponds to a rotating shaft 500, the main board 400 is fixedly connected to the rotating shaft 500, the rotating shaft 500 is sealed and rotatably installed 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 component 600 is installed on the kiln body 100 and is used to control the rotation angle of the rotating shaft 500.

[0027] Each main board 400 is a rectangular plate-like structure, and one side wall close to the inner wall of the kiln body 100 is processed into an arc surface 410. The diameter of the arc surface 410 is the same as the inner wall diameter of the kiln body 100. When the length direction of the main board 400 faces the axial direction of the kiln body 100, there is a spacing of 5 - 10 mm between the arc surface 410 and the inner wall of the kiln body 100 to ensure smooth rotation of the main board 400.

[0028] Referring to Figure 4 , the control component 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 face is distributed 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 are in one-to-one correspondence; the first unlocking member 630 is installed on the first driving wheel 610 and is used to fix or unlock the first driving wheel 610.

[0029] Referring to Figure 3, the control component 600 mainly enables the main board 400 to have two main rotation states within the kiln body 100. When the main board 400 is in the first state, its length direction is the same as that of the kiln body 100. In this state, along with the rotation of the kiln body 100, the main board 400 can play an important role in guiding and lifting materials, guiding the materials to move orderly within the kiln body 100, and making the materials be fully lifted during the rotation process, which helps the materials to come into full contact with hot air and improves the heat exchange efficiency.

[0030] Referring to Figure 5 , when the main board 400 rotates to the second state, its arc surface 410 will be in close contact with the inner wall of the kiln body 100. At this time, the main board 400 is like a fire-resistant wall, which can effectively block the direct impact of flames and heat, and play a role in regulating the temperature distribution within the kiln body 100 and the heating condition of the materials.

[0031] Referring to Figure 6 , specifically, the first unlocking member 630 includes a first positioning block 631, a first screw 632 and a first nut 633 fixedly installed on the first positioning block 631. The first positioning block 631 is fixedly installed on the first driving wheel 610. A protective cover 700 is fixedly installed on the outer wall of the kiln body 100. The protective cover 700 is provided with a first travel groove 710. The first positioning block 631 is located within the protective cover 700. The first screw 632 extends out of the protective cover 700 through the first travel groove 710. The distance that the first travel groove 710 extends along the circumferential direction of the kiln body 100 is the rotation travel of the first driving wheel 610. By pushing the first screw 632 to rotate the first driving wheel 610, when the first screw 632 abuts against one end wall of the first travel groove 710, the main board 400 is in the first state. When the first driving wheel 610 is rotated so that the first screw 632 abuts against the other end wall of the first travel groove 710, the main board 400 is in the second state. Then the first nut 633 is threadedly connected to the first screw 632 so that the first nut 633 presses against the side wall of the protective cover 700, and the first driving wheel 610 is fixed. After the first driving wheel 610 is fixed, the main board 400 can maintain the first state or the second state. The protective cover 700 limits the rotation travel of the first driving wheel 610 to control the rotation of the rotating shaft 500 by only 90°. The protective cover 700 also covers and protects the first driving wheel 610 and the first driven gear 620.

[0032] Referring to Figure 7 , in addition, an adjusting plate 420 is rotatably installed on the main board 400, and a reset member that always makes the adjusting plate 420 tend to rotate towards the inner wall of the kiln body 100. There are two adjusting plates 420, which are respectively located on the opposite two plate surfaces of the main board 400. A round rod 440 is fixedly installed on the plate surface of the main board 400. The adjusting plate 420 is rotatably installed on the round rod 440. The central axis of the round rod 440 is perpendicular to the central axis of the rotating shaft 500.

[0033] Refer to Figure 8 Figure 8 , the reset member is the first torsion spring 430. The first torsion spring 430 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 adjusting plate 420, so that the adjusting 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 adjusting plate 420 close to the inner wall of the kiln body 100 is a flat surface and is tangent to the inner wall of the kiln body 100.

[0034] When the main board 400 rotates along with the rotating shaft 500, the adjusting plate 420 rotates away from the inner wall of the kiln body 100, and can also play a certain role in scraping materials during the rotation process, preventing the materials from adhering to the main board 400.

[0035] Refer to Figure 9 Figure 9 , an additional plate 450 is provided at the end face of the main board 400 opposite to the arc surface 410. The main board 400 is connected with a connecting rod 460. The connecting rod 460 is rotatably connected to the additional plate 450. A second torsion spring 470 is installed on the connecting rod 460 for driving the additional plate 450 to fit on the additional plate 450, so that the included angle between the main board 400 and the additional plate 450 forms a right angle. When the material contacts the main board 400, the additional plate 450 can perform additional turning and pushing on the material, making the movement track of the material more complex, and enabling the material to contact and mix with the thermal field more fully.

[0036] Refer to Figure 10 and Figure 11 Figure 11 , since the additional plate 450 is rotatably installed on the main board 400, when the main board 400 rotates to act as a fire baffle, the arc surface 410 of the main board 400 fits against the inner wall of the kiln body 100, the adjusting plate 420 moves away from the inner wall of the kiln body 100, the adjusting plate 420 pushes the additional plate 450 to rotate, and increases the included angle between the additional plate 450 and the main board 400, and can also increase the fire baffle area in terms of fire baffle.

[0037] The implementation principle of a segmented roasting rotary kiln in the first embodiment of the present application is as follows: In actual operation, according to the raw material characteristics (such as pellet diameter, moisture content), by controlling the rotation of different groups of main boards 400 by the control component 600, the main board 400 forms a fire baffle, achieving the effect of lengthening or shortening the roasting section. For example, when processing a sludge sample with a high moisture content, rotate the main boards 400 of the second group and the fifth group to form a longer roasting section, extend the residence time of the material in the high-temperature area, meet its longer roasting cycle requirements, avoid multiple roastings, and improve production efficiency.

[0038] Embodiment 2: Based on Embodiment 1, a segmented roasting rotary kiln in Embodiment 2 adds a lengthening rod 800 and its related control structure to the main board 400. The structures and connection relationships of the kiln body 100, the main board 400, the rotating shaft 500, and the control assembly 600 are the same as those in Embodiment 1.

[0039] Referring to Figure 12 , the length direction of the lengthening rod 800 is the same as that of the main board 400, and a plurality of stirring rods 810 are arranged at intervals in the length direction of the lengthening rod 800. When the kiln body 100 rotates, the lengthening rod 800 and the stirring rods 810 move together with the main board 400, and the stirring rods 810 can stir the materials to prevent the materials from accumulating and caking, so that the materials maintain good fluidity in the kiln.

[0040] Referring to Figure 12 and Figure 13 , one end of the lengthening rod 800 is inserted into the main board 400, an installation groove 480 is formed in the main board 400, and the opening of the installation groove 480 penetrating the outer wall of the main board 400 only allows the stirring rod 810 and the lengthening rod 800 to pass through. A driving gear 490 is rotatably installed in the main board 400 in the installation groove 480, and a rack 820 for meshing with the driving gear 490 is arranged at one end of the lengthening rod 800 extending into the installation groove 480. The driving gear 490 is connected with a driving shaft 491, the driving shaft 491 passes through the rotating shaft 500, the driving shaft 491 extends out of the kiln body 100 and is coaxially connected with a second driven gear 492. In order to install the driving gear 490 in the main board 400, the main board 400 in Embodiment 2 is relatively thick, and the main board 400 can be fixedly spliced in half, which is convenient for installing the driving gear 490.

[0041] Referring to Figure 14 , a second driving wheel 493 is rotatably connected to the outer wall of the kiln body 100, and teeth for meshing with the second driven gear 492 are arranged on one end face in the axial direction of the second driving wheel 493. A second unlocking member 900 is installed outside the kiln body 100 for fixing 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.

[0042] The second positioning block 910 is fixedly installed on the other end face in the axial direction of the second driving wheel 493, and the second positioning block 910 slides on the outer wall of the kiln body 100 as the second driving wheel 493 rotates. The protective cover is provided with a second travel groove 720, the second positioning block 910 is located inside the protective cover 700, one end of the second screw 920 extends out of the protective cover 700 through the second travel groove 720, and the length of the second travel groove 720 extending in the circumferential direction of the kiln body 100 is the rotation stroke of the second driving wheel 493.

[0043] When the second screw rod 920 abuts against one end wall of the second stroke groove 720, the second nut 930 presses against the protective cover 700, the extension rod 800 extends out of the main board 400 by the longest distance, and a stirring rod 810 closest to the main board 400 on the extension rod 800 seals the notch of the installation groove 480. When the second screw rod 920 abuts against the other end wall of the second stroke groove 720, the second nut 930 presses against the protective cover 700, the extension rod 800 is received in the main board 400, and a stirring rod 810 farthest from the main board 400 on the extension rod 800 seals the notch of the installation groove 480.

[0044] The implementation principle of a segmented roasting rotary kiln according to the second embodiment of the present application is as follows: An operator can rotate the second driving wheel 493 according to the specific conditions of the material. The second driving wheel 493 drives the second driven gear 492 and the driving shaft 491 to rotate, and then drives the extension rod 800 to slide through the cooperation of the driving gear 490 and the rack 820, so as to adjust the position of the stirring rod 810 to better adapt to different material characteristics and the working conditions inside the kiln. For example, when the amount of material is large or unevenly distributed, the position of the extension rod 800 can be adjusted so that the stirring rod 810 can fully stir the material to ensure that the material is evenly heated. At the same time, the operator can rotate the first driving wheel 610 and the second driving wheel 493 respectively according to the actual production requirements, so that the main board 400 rotates to a suitable angle to form the required functional area inside the kiln, and adjust the working states of the extension rod 800 and the stirring rod 810, such as stirring frequency, stirring depth, etc., greatly improving the adaptability of the rotary kiln to different raw materials and process requirements, and enabling efficient and stable production of ceramsite roasting under various working conditions, improving product quality and production efficiency.

[0045] Embodiment 3: A method for preparing ceramsite disclosed in this embodiment 3. The method for preparing ceramsite includes the following steps: S1. Raw material collection and pretreatment: Collect various sludge samples, such as municipal 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.

[0046] S2. Ratio design and mixing molding: Design a reasonable raw material ratio plan according to the previous research results.

[0047] S3. Use the above-mentioned segmented roasting rotary kiln to roast ceramsite: Feed the prepared ceramsite green body 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 role in guiding the ceramsite, enabling the ceramsite material to move smoothly in the kiln body 100; when the length direction of the main board 400 is perpendicular to the axial direction of the kiln body 100, the main board 400 mainly acts as a fire wall. According to the moisture content of the sludge sample, rotate different groups of the main board 400 to form a fire wall, achieving the effect of lengthening or shortening the roasting section. For example, for sludge samples with high moisture content, rotate the main board 400 to form a longer roasting section, extending the residence time of the material in the high-temperature area to ensure its full drying and roasting; for samples with low moisture content, shortening the roasting section can avoid over-roasting and improve production efficiency. During the roasting process, parameters such as the temperature and atmosphere in the kiln body 100 can be independently controlled as needed to achieve the process path of "gradient heating - high-temperature roasting - rapid cooling" for the ceramsite.

[0048] S4. Cooling treatment: After roasting is completed, perform cooling treatment on the ceramsite. Cooling can be carried out by natural cooling or forced cooling methods.

[0049] S5. Performance detection: Conduct performance detection and evaluation on the cooled sludge ceramsite. The detection items can include performance indicators such as the strength, internal pore structure, and water absorption rate of the ceramsite. Adjust and optimize parameters such as the raw material ratio and preparation process according to the detection results to improve the performance indicators of the sludge ceramsite.

[0050] The above are all preferred embodiments of this application. The protection scope of this application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A segmented roasting rotary kiln, characterized in that, Comprising: A kiln body (100); Main boards (400), a plurality of which are circumferentially spaced along the inner wall of the kiln body (100). The main boards (400) in the same circle are in a group, and multiple groups are axially spaced along the kiln body (100); Rotating shafts (500), corresponding to the main boards (400) one by one. The main boards (400) are fixedly connected to the rotating shafts (500). The rotating shafts (500) are rotatably installed on the kiln body (100), and the length direction of the rotating shafts (500) is the same as the radial direction of the kiln body (100); A control assembly (600), installed on the kiln body (100) for controlling the rotation angle of the rotating shafts (500); One side wall of the main board (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 board (400) is perpendicular to the axial direction of the kiln body (100), the arc surface (410) of the main board (400) fits on the inner wall of the kiln body (100).

2. The segmented roasting rotary kiln according to claim 1, characterized in that, An adjusting board (420) is rotatably installed on the main board (400), and a reset member that always drives the adjusting board (420) to have a tendency to rotate towards 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 board (420) to fit on the inner wall of the kiln body (100). When the main board (400) rotates with the rotating shaft (500), the adjusting board (420) rotates away from the inner wall of the kiln body (100).

3. The segmented roasting rotary kiln according to claim 2, characterized in that, An additional board (450) is arranged on the end face of the main board (400) opposite to the arc surface (410), and an included angle is formed between the main board (400) and the additional board (450).

4. The segmented roasting rotary kiln according to claim 3, wherein, The additional board (450) is rotatably installed on the main board (400). When the adjusting board (420) rotates downward, the adjusting board (420) pushes the additional board (450) to rotate, increasing the angle between the main board (400) and the additional board (450).

5. A segmented roasting rotary kiln according to claim 1, wherein, The control assembly (600) includes: A first driving wheel (610), coaxially sleeved on the outer wall of the kiln body (100), and teeth are distributed on the axial end face 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) is coaxially and fixedly connected to the rotating shaft (500); A first unlocking member (630) for fixing or unlocking the first driving wheel (610).

6. The segmented roasting rotary kiln according to claim 5, wherein, It further includes an extension rod (800), slidably installed along the length direction of the main board (400), and a plurality of stirring rods (810) are spaced on the extension rod (800).

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

8. A method for preparing ceramsite, characterized in that, It includes the following steps S1. Raw material collection and pretreatment; S2. Ratio design and mixing and forming; S3. Roasting ceramsite by using the sectional roasting rotary kiln described in 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 in guiding ceramsite. When the length direction of the main board (400) is perpendicular to the axial direction of the kiln body (100), the main board (400) mainly plays the role of a fire wall. According to the moisture content of the sludge sample, rotate different groups of main boards (400) to make the main boards (400) form a fire wall to achieve the effect of lengthening or shortening the roasting section; S4. Cooling treatment; S5. Performance detection.

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