Automatic powder feeding device of rotary kiln

Abstract

The utility model discloses an automatic powder feeding device of a rotary kiln in the technical field of rotary kilns, which comprises a kiln head cover, a powder temporary storage bin, a plurality of feeding spoons and a plurality of material guide spiral blades, the kiln head cover is arranged on the outer side of the front end of the rotary kiln, the powder temporary storage bin is arranged in the kiln head cover, and the feeding spoons are arranged on the feeding spoons. The feeding spoon is installed at the front end of the rotary kiln and located in the powder temporary storage bin. The material guiding spiral blade is arranged on the inner wall of the front end of the rotary kiln. According to the automatic powder feeding device, additional mechanical equipment is not needed, material taking and feeding are achieved through rotation of the rotary kiln, the investment cost is reduced, and the equipment failure and maintenance requirements are reduced.

Description

Technical Field

[0001] This utility model relates to the field of rotary kiln technology, and in particular to an automatic powder feeding device for rotary kilns. Background Technology

[0002] Rotary kilns are indispensable equipment in many industrial production processes, and the feeding process is one of the key factors affecting the production efficiency and feeding uniformity of rotary kilns.

[0003] There are several methods for feeding powder materials, the most common being: ① Chute feeding: The material enters the rotary kiln directly through a chute. This method is simple and easy to implement, but the feed rate is difficult to control, which can easily lead to material accumulation or blockage; ② Screw feeding: The material is fed into the rotary kiln through a screw conveyor. The feed rate is stable and continuous feeding can be achieved, but the equipment cost is high and it is not suitable for conveying high-temperature materials; ③ Belt feeding: The material is fed into the rotary kiln through a belt conveyor. The feed rate is large and it is suitable for large-scale production, but attention needs to be paid to belt misalignment, wear and high temperature issues.

[0004] This demonstrates that existing powder feeding methods all have corresponding shortcomings. Furthermore, during production, it was found that due to the temperature inside the rotary kiln and its thermal expansion characteristics, mechanical feeding equipment should be avoided as much as possible; otherwise, jamming may easily occur. Utility Model Content

[0005] This application provides an automatic powder feeding device for a rotary kiln, which eliminates the need for additional mechanical equipment and solves problems such as material accumulation, blockage, high equipment cost, and conveying failure in high-temperature environments that exist in the prior art. It reduces investment costs and decreases equipment failure and maintenance needs.

[0006] This application provides an automatic powder feeding device for a rotary kiln, comprising: a kiln head cover, a powder storage bin, several feed scoops, and several guide spiral blades. The kiln head cover is disposed on the outer side of the front end of the rotary kiln, the powder storage bin is disposed inside the kiln head cover, the feed scoops are installed on the front end of the rotary kiln and located inside the powder storage bin, and the guide spiral blades are disposed on the inner wall of the front end of the rotary kiln.

[0007] The beneficial effects of the above technical solution are as follows: This automatic powder feeding device is based on the fluidity of powder. Relying on the rotation of the rotary kiln itself, the material is picked up by a scoop and rotated to a certain angle. The material then automatically slides down along the arc set by the guide spiral blades and enters the kiln. Therefore, feeding can be achieved without mechanical equipment, reducing investment costs and minimizing conveying failures in high-temperature environments. The guide spiral blades are located at the kiln inlet to prevent material backflow caused by accumulation.

[0008] Based on the above technical solution, this application can be further improved, as follows:

[0009] Furthermore, the bottom of the feed scoop is an arc-shaped base plate, and the sides of the scoop are provided with arc-shaped side plates. Both the arc-shaped base plate and one end of the arc-shaped side plate extend into the rotary kiln. This shaped scoop can automatically scoop up powder as the rotary kiln rotates. When the scoop rotates to a certain height, and the horizontal angle of the arc-shaped base plate is greater than the angle of repose of the powder, the material slides smoothly along the arc-shaped base plate due to gravity and falls into the rotary kiln, making it less prone to clogging.

[0010] Furthermore, the number and volume of the feeding scoops are matched to the maximum feeding capacity. The volume of the scoops multiplied by the number of scoops and the number of rotations must be greater than the maximum feeding capacity.

[0011] Furthermore, a powder inlet is provided at the top of the powder storage silo. The powder enters the powder storage silo inside the kiln head hood through the powder inlet by pneumatic conveying or silo unloading.

[0012] Furthermore, the bottom corners of the powder storage bin are provided with arc-shaped blocks to conform to the rotation trajectory of the scoop and reduce the amount of material remaining in the powder storage bin. Attached Figure Description

[0013] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0014] Figure 1 This is a cross-sectional schematic diagram of the structure of an automatic powder feeding device for a rotary kiln in an embodiment of this application;

[0015] Figure 2 This is a schematic diagram of the installation structure of a feeding scoop and a guiding spiral blade in an embodiment of this application;

[0016] Among them, 1. Rotary kiln, 2. Kiln head hood, 3. Powder temporary storage bin, 31. Powder feed inlet, 32. Arc-shaped block, 4. Feed scoop, 41. Arc-shaped bottom plate, 42. Arc-shaped side plate, 5. Guide spiral blade. Detailed Implementation

[0017] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are only for illustrating the present invention and not for limiting the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0018] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0019] In the description of this utility model, it should be noted that the terms "vertical," "outer peripheral surface," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. It should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] In the description of this utility model, the illustrative expressions of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate different embodiments or examples described in this utility model, as well as the features of different embodiments or examples.

[0021] This application provides an automatic powder feeding device for a rotary kiln, eliminating the need for additional mechanical equipment. This solves problems in existing technologies such as material accumulation, blockage, high equipment costs, and conveying failures under high-temperature environments, thereby reducing investment costs and minimizing equipment malfunctions and maintenance needs. The technical solution in this application aims to address the aforementioned problems, and the overall approach is as follows: Example 1

[0022] like Figure 1-2 As shown, an automatic powder feeding device for a rotary kiln is cleverly installed at the front end of the rotary kiln 1, aiming to achieve continuous, uniform, and automated powder supply. The entire device consists of four core components: a kiln head cover 2, a powder storage bin 3, multiple feed scoops 4, and multiple guide spiral blades 5.

[0023] The kiln head hood 2, as an external protective structure, is securely installed on the outer side of the front end of the rotary kiln 1, serving to isolate the external environment and protect the internal components. The powder storage bin 3 is located inside the kiln head hood 2, and the top of the powder storage bin 3 has a powder inlet 31, which facilitates the entry of external powder into the bin for temporary storage via a pneumatic conveying system or direct unloading, providing sufficient raw material reserves for subsequent feeding processes.

[0024] Multiple feed scoops 4 are installed at equal intervals around the front end of the rotary kiln 1 and extend into the powder storage bin 3 to scoop powder as the rotary kiln 1 rotates. Each scoop is ingeniously designed, with an arc-shaped bottom plate 41 and arc-shaped side plates 42 on the sides. One end of both extends into the rotary kiln 1. This design not only ensures that the scoop can smoothly scoop powder as the rotary kiln rotates, but also, when the scoop rotates to a certain height, once the horizontal angle of the arc-shaped bottom plate 41 exceeds the angle of repose of the powder, the powder will automatically slide along the arc-shaped bottom plate 41 due to gravity. At the same time, the arc-shaped side plates 42 act as guides, allowing the material to fall accurately into the rotary kiln 1 along a preset arc trajectory, effectively avoiding blockage.

[0025] Multiple feed guide spiral blades 5 are spaced around and installed on the inner wall of the front end of the rotary kiln 1.

[0026] Furthermore, the number and volume of the feed scoops 4 are precisely calculated to ensure they match the maximum feed rate. Specifically, the total volume of the scoops (the volume of a single scoop multiplied by the number of scoops) is multiplied by the number of revolutions of the rotary kiln, and the result must be greater than or equal to the expected maximum feed rate, thereby ensuring the continuity and stability of the powder supply.

[0027] In addition, the bottom corner of the powder storage bin 3 is provided with an arc-shaped block 32. The arc-shaped block is used to conform to the rotation trajectory of the scoop, reduce the material accumulation in the corners of the powder storage bin, further optimize the flowability of the powder, and improve the feeding efficiency. Example 2

[0028] Based on Example 1, this example further elaborates on the automatic powder feeding device as follows:

[0029] like Figure 1-2As shown, the kiln head hood 2 is securely installed on the outer side of the front end of the rotary kiln 1 and a sealing device is provided with the outer wall of the rotary kiln 1. The powder storage bin 3 can be a separate component or can be implemented using the inner wall of the kiln head hood 2, as long as a powder storage space can be formed; when the powder storage bin 3 is a separate component, it is fixed to the inside of the kiln head hood 2 by bolts or other fastening devices. The feed scoop 4 and the guide spiral blades 5 are key components of the device, and six of them are configured. The six feed scoops 4 are installed around the front end of the rotary kiln 1 at equal intervals. The scoops are installed by bolting or welding on the mounting seats pre-set on the front end of the rotary kiln, ensuring that the scoops can stably scoop up powder when the rotary kiln rotates; the six guide spiral blades 5 are installed around the inner wall of the front end of the rotary kiln 1 at intervals. The spiral blades 5 are fixed to the inner wall of the rotary kiln by welding or bolting, ensuring that the powder entering the kiln inlet can be quickly pushed into the kiln area along the spiral blades when the rotary kiln rotates.

[0030] This automatic powder feeding device is suitable for feeding powder materials into rotary kilns. The working process is as follows: Powder enters the powder storage bin inside the kiln head hood through pneumatic conveying or silo unloading. When the rotary kiln rotates, the feed scoop rotates with the kiln body and scoops powder from the powder storage bin. When the scoop rotates to a certain height and the horizontal angle of the arc-shaped bottom plate is greater than the angle of repose of the powder, the material slides along the arc-shaped bottom plate due to gravity. At the same time, the arc-shaped side plate guides the material into the rotary kiln along the set arc direction. The powder entering the kiln inlet is quickly pushed into the kiln area by the guide spiral blades inside the kiln.

[0031] The automatic powder feeding device is powered entirely by the rotary kiln itself, relying on a scoop to pick up and feed materials. There are no additional mechanical equipment, which reduces investment costs and equipment failure and maintenance needs.

[0032] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An automatic powder feeding device for a rotary kiln, characterized in that, include: The kiln head hood is located on the outer side of the front end of the rotary kiln. The powder storage silo is located inside the kiln head hood; Several feed scoops are installed at the front end of the rotary kiln and located in the powder storage bin; Several feed guide spiral blades are disposed on the inner wall of the front end of the rotary kiln.

2. The automatic powder feeding device according to claim 1, characterized in that: The bottom of the feed scoop is an arc-shaped bottom plate, and the sides of the scoop are provided with arc-shaped side plates. One end of the arc-shaped bottom plate and the arc-shaped side plates both extend into the rotary kiln.

3. The automatic powder feeding device according to claim 2, characterized in that: The number and volume of the feeding scoops are matched with the maximum feeding amount.

4. The automatic powder feeding device according to claim 1, characterized in that: The powder storage silo has a powder inlet at the top.

5. The automatic powder feeding device according to claim 4, characterized in that: The bottom corners of the powder storage bin are provided with arc-shaped blocks.

6. The automatic powder feeding device according to claim 1, characterized in that: There are 6 feeding scoops, which are installed around the front end of the rotary kiln at equal intervals and extend into the powder storage bin.

7. The automatic powder feeding device according to claim 6, characterized in that: The material guiding spiral blades are provided in six units, which are installed around the inner wall of the front end of the rotary kiln at equal intervals.

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