Rotary kiln for powder raw material treatment
By combining external and internal heating, the problem of uneven temperature of powder raw materials in rotary kilns is solved, achieving faster and more uniform heating, and improving production efficiency and heat treatment effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-30
- Publication Date
- 2026-03-27
AI Technical Summary
In existing rotary kilns, the temperature of the powdered raw materials is uneven due to the single external heating process, resulting in uneven reaction and some materials failing to be fully decomposed or reduced.
The system combines external and internal heating mechanisms. External heating is achieved through a heating source outside the kiln, while internal heating is achieved through a hollow heating shaft and an internal heating source inside the kiln. This, combined with a stirring structure, agitates the powdered raw materials to ensure uniform heating.
It achieves uniform heating of powder raw materials from the surface to the core, shortens the reaction time by 20-30%, avoids local overheating or insufficient reaction, and significantly improves production efficiency and thermal efficiency by 25-35%.
Smart Images
Figure CN224050998U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to rotary kiln technical field, concretely relates to a rotary kiln for powder raw material treatment. BACKGROUND
[0002] The rotary kiln is a rotary calcining kiln widely used in building materials, metallurgy, chemical industry, environmental protection and other fields. It mainly moves the material in the kiln body by the kiln body with a certain angle and continuous rotation, and uses natural gas as the combustion material to calcine the material in the kiln body. Many powder raw materials need to be calcined, decomposed, sintered, granulated, reduced or impurity removed by the kiln body. In the metallurgical industry, iron ore powder is reduced to sponge iron or sintered into pellets; in the chemical industry, the rotary kiln is used to decompose ilmenite and other raw materials at high temperature.
[0003] A reduction rotary kiln for tungsten-molybdenum powder smelting is disclosed in Chinese patent No. 2024111998886, which comprises a support seat and a kiln body inclinedly arranged thereon. The inside of the kiln body is provided with: a circumferential array of spiral-shaped guide grooves, the inside of the guide groove is provided with a linear array of guide blocks, and the guide block is provided with a first slope for guiding the powder material. During the rotation of the kiln body, the powder material moves along the spiral-shaped guide groove and contacts the first slope of the guide block. The first slope can increase the slope of the sliding slope for the powder material, thereby guiding the powder to move as much as possible and avoiding the powder from being retained on the guide groove with a smaller slope. The powder material gradually moves to the end of the first slope and falls into the middle of the first slope of the guide block in the next guide groove, thereby enabling the powder material to continue moving.
[0004] The above-mentioned scheme can improve the output rate of the powder target product, but the existing kiln body is heated by the heating source located on the outside or the bottom of the kiln body, which radiates or conducts heat to the inside through the kiln wall. This will cause the internal and external temperature of the powder raw material to be inconsistent. Since the powder material usually has poor thermal conductivity, the outside is heated quickly and the inside is heated slowly, which can cause uneven reaction and some materials may not be fully decomposed or reduced due to insufficient temperature. UTILITY MODEL CONTENTS
[0005] To solve the above-mentioned problems, the utility model provides a rotary kiln for powder raw material treatment, which comprises a support seat, a kiln body, a feeding device, an external heating mechanism and an internal heating mechanism. The kiln body is inclinedly arranged on the support seat,
[0006] The support seat is provided with a base, the base is rotatably provided with a supporting wheel, the kiln body is tightly sleeved with a wheel belt, the wheel belt is rotatably arranged with the supporting wheel, the support seat is further provided with a supporting wheel mechanism, the feeding device is arranged at the front end of the kiln body, the external heating mechanism is arranged at the bottom of the kiln body, the internal heating mechanism is arranged in the kiln body, the internal heating mechanism comprises a hollow heating shaft, the hollow heating shaft is internally provided with an internal heating source, the two ends of the hollow heating shaft are provided with connecting rods, the hollow heating shaft is connected with the inner wall of the kiln body through the connecting rods, and a plurality of stirring main shafts are arranged on the hollow heating shaft.
[0007] Preferably, the internal heating source is a heating resistor, and the heating resistor is in a serpentine structure.
[0008] Preferably, the end of the stirring main shaft away from the hollow heating shaft is connected with a stirring sub-shaft.
[0009] Preferably, the feeding device comprises a feeding box and a power box arranged at the bottom of the feeding box, the upper portion of the feeding box is provided with a feeding hopper, the power box is rotatably provided with a rotating shaft, the rotating shaft extends upward into the feeding box, the rotating shaft is sequentially provided, from top to bottom, with a first crushing blade, a second crushing blade and a material conveying rod, the side of the power box is provided with a first driving motor, the first driving motor and the rotating shaft are connected with a transmission belt, the bottom side of the feeding box is communicated with a material conveying pipe, and one end of the material conveying pipe extends into the kiln body.
[0010] Preferably, the inside of the material conveying pipe is rotatably provided with a material conveying auger, the bottom of the power box is connected with a second driving motor, and the second driving motor drives the material conveying auger to rotate.
[0011] Preferably, one end of the outer side of the kiln body is provided with a transmission gear, the support seat is provided with a third driving motor, the output end of the third driving motor is connected with a driving gear, and the driving gear is engaged with the transmission gear.
[0012] The advantages of the present application are as follows:
[0013] 1. The bidirectional heat source system of external heating and internal heating significantly improves the uneven temperature distribution problem of the traditional rotary kiln caused by single external heating. At the same time, the synchronous action of internal and external heat sources enables the powder to quickly reach the target temperature from the surface to the core, reducing the reaction blind area.
[0014] 2. The stirring structure of the present application continuously stirs the powder raw materials when the kiln body rotates, effectively breaking the material agglomeration phenomenon, enabling heat to be more quickly and uniformly transferred from the internal and external heating sources to each particle, and maintaining good fluidity and dispersibility of the material.
[0015] 3. The first crushing blade and the second crushing blade can scatter the large-particle material into smaller and more uniform particles in the scheme, and the crushed material is more easily contacted with the heat source in the kiln body, thereby promoting efficient heat treatment. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 It is an internal heating mechanism structure diagram of the utility model.
[0017] Figure 2 It is a whole structure diagram of the utility model.
[0018] Figure 3 It is a feeding device structure diagram of the utility model.
[0019] Figure 4 It is a feeding pushing rod schematic diagram of the utility model.
[0020] Figure 5 It is an internal heating source structure diagram of the utility model.
[0021] Figure 6 It is a structure diagram of the utility model internal heating mechanism adding stirring sub-shaft.
[0022] In the drawing: 1 support seat, 2 kiln body, 3 base seat, 4 supporting wheel, 5 wheel belt, 6 blocking wheel mechanism, 7 external heating mechanism, 8 hollow heating shaft, 9 internal heating source, 10 connecting rod, 11 stirring main shaft, 12 stirring sub-shaft, 13 feeding box, 14 power box, 15 feeding hopper, 16 rotating shaft, 17 first crushing blade, 18 second crushing blade, 19 feeding pushing rod, 20 external power supply, 21 first driving motor, 22 transmission belt, 23 feeding pipe, 24 feeding auger, 25 second driving motor, 26 transmission gear, 27 third driving motor, 28 driving gear. DETAILED DESCRIPTION
[0023] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model.
[0024] In the description of the utility model, it should be explained that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "another end" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.
[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Simultaneously, when an component is referred to as "fixed to" or "equipped on" another component, it can be directly on the other component or may have an intervening component present. When an component is referred to as "connected to" another component, it can be directly connected to the other component or may have an intervening component present. When an component is referred to as "fixedly connected to" another component, it can be a common fixed connection method such as welding, bolting, or gluing. In short, those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0026] Example 1, as Figures 1-2 As shown, a rotary kiln for processing powder raw materials includes a support base 1, a kiln body 2, a feeding device, an external heating mechanism 7, and an internal heating mechanism. The kiln body 2 is inclinedly mounted on the support base 1, which has a base 3. A support roller 4 is rotatably mounted on the base 3. A tire 5 is tightly fitted around the outside of the kiln body 2, and the tire 5 and the support roller 4 are arranged in a rolling configuration to achieve continuous rotation of the kiln body 2. The support base 1 also has a baffle mechanism 6, which consists of a vertical baffle and a rotating wheel. The rotating wheel is rotatably mounted on the vertical baffle, and one side of the rotating wheel abuts against the tire 5. When the kiln body 2 rotates, causing the tire 5 to rotate, the rotating wheel rotates with the tire 5 and provides a limit, preventing axial movement of the kiln body 2. The support base 1 also has a support plate, which is rotatably connected to the front end of the kiln body 2 via a bearing, further limiting its movement.
[0027] Combination Figure 3 and Figure 4 The feeding device is located at the front end of the kiln body 2, and the powdered raw material continuously enters the kiln body 2 through the feeding device. The external heating mechanism 7 is located at the bottom of the kiln body 2, and the internal heating mechanism is located inside the kiln body 2. The external heating mechanism 7 heats the powdered raw material inside the kiln body 2 from the outside, while the internal heating mechanism heats the powdered raw material from the inside. Specifically, the external heating mechanism 7 is a gas burner located at the bottom of the kiln body 2. The gas burner heats the rotating kiln body 2 from the outside, and the heat is transferred to the powdered raw material inside through the kiln wall. The internal heating mechanism includes a hollow heating shaft 8, inside which is an internal heating source 9. Connecting rods 10 are provided at both ends of the hollow heating shaft 8, and the hollow heating shaft 8 is connected to the inner wall of the kiln body 2 through the connecting rods 10. The internal heating source 9 heats from the inside, transferring heat from the middle of the interior of the kiln body 2 to the powdered raw material. Figure 5In the embodiment, the inner heating source 9 is a heating resistor, which is in a serpentine structure. The heating resistor is powered by an external power supply 20. The external power supply 20 can be fixed on the outside of the end of the kiln body 2 and rotates with the kiln body 2. The connection of the external power supply 20 is connected with the heating resistor through the inside of the connecting rod 10. In addition to the heating resistor, the inner heating source 9 can also be an electric heating rod, a gas nozzle, or a microwave emitter, etc.
[0028] Through the cooperation of the external gas burner and the built-in hollow heating shaft 8, uniform heating of the powder material from the surface layer to the core is achieved, effectively solving the temperature gradient problem caused by single external heating in traditional rotary kilns. The external heating is radiated from the kiln wall, and the internal heating directly penetrates the material layer through the resistor or electric heating rod. This two-way heating method also significantly speeds up the heat conduction efficiency, making the whole material quickly reach the target temperature, not only shortening the reaction time by about 20%-30%, but also avoiding the phenomenon of local overburning or insufficient reaction. It significantly improves the production efficiency and economic benefits, and provides reliable technical support for the precise heat treatment of high-value-added powder materials.
[0029] In combination Figure 6 The hollow heating shaft 8 is provided with a plurality of stirring main shafts 11. The end of the stirring main shaft 11 away from the hollow heating shaft 8 is connected with a stirring sub-shaft 12. The stirring main shaft 11 and the stirring sub-shaft 12 rotate with the rotation of the kiln body 2, and can stir the powder raw material in the kiln body 2. The stirring device continuously turns the powder raw material when the kiln body 2 rotates, effectively breaking the material agglomeration phenomenon, so that heat is more quickly and uniformly transferred to each particle from the internal and external heating sources, significantly improving the thermal efficiency by about 25-35%. For materials prone to sintering such as metal powder, ceramic precursor, etc., dynamic stirring can effectively prevent the material from sticking to the kiln wall or forming lumps at high temperature, and maintain good fluidity and dispersibility of the material.
[0030] The feeding device includes a feeding box 13 and a power box 14 located at the bottom of the feeding box 13. The feeding box 13 is provided with a feeding hopper 15 above. The inside of the feeding box 13 is provided with a crushing assembly. The power box 14 is rotatably provided with a rotating shaft 16, which extends upward into the feeding box 13. The rotating shaft 16 is sequentially provided with a first crushing blade 17, a second crushing blade 18, and a material conveying rod 19 from top to bottom. The side of the power box 14 is provided with a first driving motor 21. The first driving motor 21 is connected with the rotating shaft through a transmission belt 22. The bottom side of the feeding box 13 is communicated with a material conveying pipe 23, one end of which extends into the kiln body 2.
[0031] After the powder raw material enters the feeding hopper 15, the first driving motor 21 drives the rotating shaft to rotate, and the first crushing blade 17 and the second crushing blade 18 crush the larger particles in the powder raw material, and then the powder raw material falls to the bottom and is pushed by the rotating feed pushing rod 19. Under the action of centrifugal force, the powder raw material is continuously thrown into the feed pipe 23 and then enters the kiln body 2. The first crushing blade 17 and the second crushing blade 18 can disperse the large-particle material into smaller and more uniform particles. In the kiln body 2, the crushed material is more easily in contact with the heat source, promoting efficient heat treatment. At the same time, through crushing, the flowability of the powder raw material is improved, which can be more smoothly conveyed into the kiln body 2, reducing blockage and transportation difficulties.
[0032] The inside of the feed pipe 23 is provided with a feed auger 24, and the bottom of the power box 14 is connected with a second driving motor 25. The second driving motor 25 drives the feed auger 24 to rotate through a transmission belt. The feed auger 24 is a screw conveyor, and the second driving motor 25 drives the screw blade to rotate, and the material is sent from the feeding end to the discharging end through the pushing force of the screw blade. It is convenient to continuously and uniformly convey the powder raw material. One end of the outside of the kiln body 2 is provided with a transmission gear 26, and the support seat 1 is provided with a third driving motor 27. The output end of the third driving motor 27 is connected with a driving gear 28, and the driving gear 28 is engaged with the transmission gear 26. The third driving motor 27 drives the transmission gear 26 and the kiln body 2 to rotate through the driving gear 28.
[0033] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.
Claims
1. A rotary kiln for processing powder raw materials, characterized in that: The utility model relates to a kiln body (2) is located on the support seat (1) and is inclined, and the support seat (1) is equipped with base (3), and the base (3) is equipped with the supporting wheel (4) rotationally, and the kiln body (2) is tightly sleeved with the wheel belt (5) outside, and the wheel belt (5) is arranged in rolling with the supporting wheel (4), and the support seat (1) is also equipped with the blocking wheel mechanism (6), and the feeding device is located at the front end of kiln body (2), and the external heating mechanism (7) is located at the bottom of kiln body (2), and the internal heating mechanism is located in the inside of kiln body (2), and the internal heating mechanism includes hollow heating shaft (8), and the inside of hollow heating shaft (8) is equipped with internal heating source (9), and the both ends of hollow heating shaft (8) are equipped with connecting rod (10), and hollow heating shaft (8) is connected with the inner wall of kiln body (2) through connecting rod (10), and hollow heating shaft (8) is equipped with a plurality of stirring main shafts (11).
2. The rotary kiln for powder raw material processing according to claim 1, characterized in that: The internal heating source (9) is a heating resistor, and the heating resistor is a serpentine structure.
3. The rotary kiln for powder raw material processing according to claim 2, characterized in that: The stirring main shaft (11) is connected with the stirring sub-shaft (12) at the end of the end away from the hollow heating shaft (8).
4. The rotary kiln for powder raw material processing according to claim 3, characterized in that: The feeding device includes a feeding box (13) and a power box (14) located at the bottom of the feeding box (13), the feeding box (13) is provided with a feeding hopper (15) above, the power box (14) is provided with a rotating shaft (16) rotationally, the rotating shaft (16) extends upward into the feeding box (13), the rotating shaft (16) is sequentially provided with a first crushing blade (17), a second crushing blade (18) and a material conveying lever (19) from top to bottom, the side of the power box (14) is provided with a first drive motor (21), the first drive motor (21) is connected with the transmission belt (22) between the rotating shaft, the bottom side of the feeding box (13) is communicated with a material conveying pipe (23), one end of the material conveying pipe (23) extends into the kiln body (2).
5. The rotary kiln for powder raw material processing according to claim 4, characterized in that: The inside of the material conveying pipe (23) is rotationally provided with a material conveying auger (24), the bottom of the power box (14) is connected with a second drive motor (25), the second drive motor (25) drives the material conveying auger (24) to rotate.
6. The rotary kiln for powder raw material processing according to claim 5, characterized in that: One end of the outside of the kiln body (2) is provided with a transmission gear (26), the support seat (1) is provided with a third drive motor (27), the output end of the third drive motor (27) is connected with a drive gear (28), and the drive gear (28) is engaged with the transmission gear (26).