A new rotary kiln mixing mechanism

Abstract

The utility model discloses a novel rotary kiln mixing mechanism, including rotary kiln cylinder and multiple sets of mixing assembly, multiple sets of mixing assembly along the circumferential interval of rotary kiln cylinder is arranged, and mixing assembly includes annular steel ring, transmission shaft, connecting shaft, mixing piece, driving wheel and limit wheel, and annular steel ring is around the outside of rotary kiln cylinder, and is perpendicular to rotary kiln cylinder axis fixed mounting on mounting seat, and transmission shaft passes through rotary kiln cylinder and is connected with rotary kiln cylinder rotation, and one end in the cylinder of transmission shaft is connected with mixing piece, and one end outside the cylinder of transmission shaft is fixedly connected with driving wheel, and driving wheel is in contact with annular steel ring at the same time with rotary kiln cylinder rotation, and connecting shaft is connected on the outer surface of rotary kiln cylinder, and limit wheel rotatoryly is set up on connecting shaft, and is in contact with driving wheel, and through the compound motion of rotary kiln cylinder autorotation and mixing piece autorotation, improve the uniformity and mixing efficiency of material mixing.

Description

Technical Field

[0001] This utility model belongs to the technical field of rotary kiln equipment, and relates to a novel rotary kiln mixing mechanism. Background Technology

[0002] Rotary kilns, as core equipment in building materials, metallurgy, and chemical industries, are widely used for material calcination, drying, and mixing. Especially in processes requiring pretreatment of two or more materials (such as limestone powder and clay powder, or coal powder and mineral powder), the uniformity of material mixing directly affects the quality of subsequent products (such as cement clinker strength and metallurgical raw material reaction efficiency). However, existing rotary kilns face the following key technical problems in mixing and supporting structural design: Traditional rotary kilns rely on lifters on the inner wall of the cylinder to turn the material over, without a dedicated mixing device or a mixing device (such as a fixed plow plate). As a result, the material mixing uniformity is poor and the mixing efficiency is low. Therefore, in order to solve the above-mentioned technical problems, the technical solution of this application is proposed. Summary of the Invention

[0003] The purpose of this invention is to provide a novel rotary kiln mixing mechanism that solves the aforementioned technical problems.

[0004] The technical solution adopted in this utility model is as follows: A novel rotary kiln mixing mechanism includes a rotary kiln cylinder and a mixing device. The mixing device includes multiple mixing components and an annular steel ring. The annular steel ring is wrapped around the outside of the rotary kiln shell and is fixedly installed on the mounting base perpendicular to the axis of the rotary kiln shell. The multiple mixing components are spaced apart circumferentially along the rotary kiln shell. Each mixing component includes a drive shaft, a connecting shaft, a mixing element, a drive wheel, and a limiting wheel. The drive shaft passes through the rotary kiln shell and is rotatably connected to it. One end of the drive shaft inside the shell is connected to the mixing element, and the other end is fixedly connected to the drive wheel. The drive wheel abuts against the annular steel ring as the rotary kiln shell rotates. The connecting shaft is connected to the outer surface of the rotary kiln shell. The limiting wheel is rotatably sleeved on the connecting shaft and abuts against the drive wheel. Further, the mixing element and the drive shaft are connected via a first flange and a second flange. The mixing element is fixedly connected to the first flange, and the second flange is fixed to the end of the drive shaft. The first flange and the second flange are detachably connected.

[0005] Furthermore, the mixing component is a plow blade or a chain.

[0006] Furthermore, the rotary kiln body is provided with at least two sets of mixing devices at intervals along its axial direction.

[0007] Furthermore, the limiting wheel is a rubber wheel, which includes an inner wheel core and an outer wheel sleeve. The outer wheel sleeve is detachably fitted onto the outside of the inner wheel core, and the overall diameter of the limiting wheel can be adjusted by replacing the outer wheel sleeve with one of different thicknesses.

[0008] Furthermore, the outer surface of the limiting wheel is provided with anti-slip texture, which is annular protrusions that are evenly distributed along the circumference of the limiting wheel.

[0009] Furthermore, it also includes a rotating ring and a stationary ring. The rotating ring is fixedly sleeved on the drive shaft, and the stationary ring is fixed to the cylinder wall of the rotary kiln. The outer ring of the rotating ring and the inner ring of the stationary ring are sealed together, and the mating surfaces of the rotating ring and the stationary ring are coated with sealing grease.

[0010] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: 1. Add a mixing device to improve the uniformity and efficiency of material mixing through the combined motion of the rotary kiln cylinder rotation and the mixing components. 2. The drive wheel revolves with the rotary kiln cylinder while rolling and frictionally transmitting power to the mixing components, eliminating the need for an additional drive device and resulting in a simple structure. 3. By adjusting the diameter of the limit wheel, the transmission ratio of the mixing device can be adjusted to meet the process requirements of different mixing processes, thus improving the applicability of the device. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort, wherein: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the rotary kiln cylinder in this utility model; Figure 3 This is an enlarged schematic diagram of point A in this utility model. Figure 4 This is a schematic diagram of the installation of the driving wheel, the annular steel ring, and the limiting wheel of this utility model.

[0012] The markings in the diagram are: 1-rotary kiln body, 2-annular steel ring, 3-limiting wheel, 4-drive wheel, 5-drive shaft, 6-connecting shaft, 7-mixing component, 8-moving ring, 9-stationary ring. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0014] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0015] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0016] The features and performance of this utility model will be further described in detail below with reference to the embodiments. Example

[0017] Please see Figures 1-3 A novel rotary kiln mixing mechanism includes a rotary kiln cylinder 1 and a mixing device. The rotary kiln cylinder 1 is made of Q235 steel, with a diameter of ∅1500 and a length of 6000mm. The outer wall of the cylinder is wrapped with a 50mm thick rock wool insulation layer.

[0018] The mixing device includes multiple mixing components and an annular steel ring 2. The annular steel ring 2 surrounds the outside of the rotary kiln shell 1 and is fixedly installed on a mounting base (not shown in the figure) perpendicular to the axis of the rotary kiln shell 1. The mounting base is fixedly installed on the ground. For example, the annular steel ring 2 is made of 304 stainless steel, with a diameter of ∅1900 and a width of 100mm. The distance between the inner ring of the annular steel ring 2 and the outer surface of the rotary kiln shell 1 is 20mm.

[0019] Multiple mixing components are arranged at intervals along the circumference of the rotary kiln shell 1. For example, there are 4 mixing components. The 4 mixing components are arranged at equal intervals along the axial direction of the rotary kiln shell 1. The 4 mixing components are symmetrically distributed at 90° in the axial direction, so that the radial forces generated by the mixing components during movement can be balanced with each other, reducing irregular vibration and additional load of the rotary kiln shell 1, and maintaining the stability of the operation of the rotary kiln shell 1.

[0020] The mixing assembly includes a drive shaft 5, a connecting shaft 6, a mixing component 7, a drive wheel 4, and a limiting wheel 3. The drive shaft 5 passes through the rotary kiln shell 1 and is rotatably connected to it. For example, the drive shaft 5 can be a stepped shaft, connected to the rotary kiln shell 1 via bearings. The stepped shaft is φ60-φ90mm in diameter and 150mm in length. One end of the drive shaft 5 located inside the shell is connected to the mixing component 7. The mixing component 7 can be a plow blade, for example, made of manganese steel, with two blades, each with a blade width of 150mm and a length of 300mm. The mixing component 7 can also be a chain, for example, model 16A-1, with a length of 800mm, and three chains. One end of the drive shaft 5 is located outside the shell. The drive wheel 4 is fixedly connected to the rotary kiln body 1. The drive wheel 4 rotates with the rotary kiln body 1 and abuts against the annular steel ring 2. The drive wheel 4 can be a rubber wheel, which includes an inner wheel core and an outer wheel sleeve. The outer wheel sleeve is detachably fitted on the outside of the inner wheel core. The connecting shaft 6 is connected to the outer surface of the rotary kiln body 1. The limiting wheel 3 rotates and is fitted on the connecting shaft 6 through a bearing and abuts against the drive wheel 4. The limiting wheel 3 and the drive wheel 4 are subjected to rolling friction transmission, which provides radial support for the drive wheel 4 and improves the smoothness of the transmission between the drive wheel 4 and the annular steel ring 2. For example, the connecting shaft 6 is made of No. 45 steel (40mm in diameter).

[0021] During operation, the mixed materials are fed into the rotary kiln shell 1. The rotary kiln is started, and the rotary kiln shell 1 rotates around its own axis. The materials are mixed inside the rotary kiln shell 1. When the rotary kiln shell 1 rotates, the drive wheel 4 set on its outer wall revolves with the rotary kiln shell 1. The drive wheel 4 and the annular steel ring 2 roll and rub against each other, which provides power for the rotation of the drive shaft 5, thereby driving the mixing component 7 connected to the drive shaft 5 to rotate. The mixing component 7 mechanically disperses and mixes the materials at the bottom of the rotary kiln shell 1 through rotation. Through the combined motion of the rotation of the rotary kiln shell 1 and the rotation of the mixing component 7, the uniformity and efficiency of material mixing are improved.

[0022] In actual use, different materials have different requirements for mixing strength. For example, lightweight powders have lower mixing strength requirements, while viscous agglomerates have higher mixing strength requirements. Different mixing components 7 need to be replaced. However, since the mixing component 7 is fixedly connected to the drive shaft 5, replacing the mixing component 7 requires completely removing the drive shaft 5, which is very troublesome.

[0023] In this embodiment of the utility model, the mixing component 7 and the drive shaft 5 are connected by a first flange and a second flange. The mixing component 7 is fixedly connected to the first flange, and the second flange is fixed to the end of the drive shaft 5. The first flange and the second flange are detachably connected, which facilitates the replacement of different mixing components 7 according to the properties of the material, thereby improving the applicability of the device.

[0024] In actual use, because the rotary kiln body 1 is relatively long, only one mixing component is set in the axial direction of the rotary kiln body 1, which will result in differences in the uniformity of material mixing.

[0025] In this embodiment of the invention, at least two sets of mixing devices are arranged at intervals along the axial direction inside the rotary kiln body 1, and multiple mixing devices are arranged at intervals along the axial direction of the rotary kiln body. The relay mixing and dispersing of adjacent mixing devices can further improve the overall mixing uniformity and efficiency of the material.

[0026] In actual use, when the moisture content of the mixed material is low, a high rotation speed will result in excessive dust in the rotary kiln, thus affecting the calcination quality. A low rotation speed will result in uneven mixing. Therefore, the transmission ratio needs to be determined according to the characteristics of the material.

[0027] In this embodiment of the utility model, the limiting wheel 3 is a rubber wheel, which includes an inner wheel core and an outer wheel sleeve. The outer wheel sleeve is detachably fitted on the outside of the inner wheel core. For example, the inner wheel core of the limiting wheel 3 is cast iron (diameter ∅300), and the outer wheel sleeve is nitrile rubber. According to the properties of different mixtures and process requirements, the overall diameter of the limiting wheel 3 can be adjusted by replacing the outer wheel sleeve of different thicknesses, thereby adjusting the transmission ratio.

[0028] In actual use, the linear rolling transmission ratio between the drive wheel 4 and the annular steel ring 2 is 1:15.8. When the rotation speed of the rotary kiln cylinder 1 is 4 r / min, the rotation speed of the mixing component 7 is 63 r / min. However, there is a risk of slippage between the limit wheel 3 and the drive wheel 4, which affects the stability of the transmission.

[0029] In this embodiment of the utility model, the outer surface of the limiting wheel 3 is provided with anti-slip texture. The anti-slip texture is annular protrusion, which is evenly distributed along the circumference of the limiting wheel 3. For example, it is used to prevent slippage between the limiting wheel 3 and the driving wheel 4.

[0030] In actual use, material leakage may occur at the connection between the drive shaft 5 and the cylinder, resulting in material waste. The material scattered in the air will also pollute the working environment.

[0031] In this embodiment of the utility model, a rotating ring 8 and a stationary ring 9 are also included. The rotating ring 8 is fixedly sleeved on the transmission shaft 5, and the stationary ring 9 is fixed to the cylinder wall of the rotary kiln body 1. The rotating ring 8 and the stationary ring 9 are sealed and fitted together, and the mating surfaces of the rotating ring 8 and the stationary ring 9 are coated with sealing grease to prevent material leakage at the connection between the transmission shaft 5 and the cylinder body, which would cause material waste and material to be scattered in the air and pollute the working environment.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model. Any modifications, equivalent substitutions and improvements made by those skilled in the art within the spirit and principles of the present utility model should be included within the scope of protection of the present utility model.

Claims

1. A novel rotary kiln mixing mechanism, characterized in that, Includes rotary kiln shell and mixing device, The mixing device includes multiple mixing components and an annular steel ring. The annular steel ring surrounds the outside of the rotary kiln shell and is fixedly installed on the mounting base perpendicular to the axis of the rotary kiln shell. The multiple mixing components are arranged at intervals along the circumference of the rotary kiln body. Each mixing component includes a drive shaft, a connecting shaft, a mixing element, a drive wheel, and a limiting wheel. The drive shaft passes through the rotary kiln body and is rotatably connected to it. One end of the drive shaft inside the kiln body is connected to the mixing element, and the other end of the drive shaft outside the kiln body is fixedly connected to the drive wheel. The drive wheel abuts against the annular steel ring as it rotates with the rotary kiln body. The connecting shaft is connected to the outer surface of the rotary kiln body. The limiting wheel is rotatably sleeved on the connecting shaft and abuts against the drive wheel.

2. The novel rotary kiln mixing mechanism according to claim 1, characterized in that, The mixing component is connected to the drive shaft via a first flange and a second flange. The mixing component is fixedly connected to the first flange, and the second flange is fixed to the end of the drive shaft. The first flange and the second flange are detachably connected.

3. The novel rotary kiln mixing mechanism according to claim 2, characterized in that, The mixing component is a plow blade or a chain.

4. The novel rotary kiln mixing mechanism according to claim 3, characterized in that, The rotary kiln body is provided with at least two sets of mixing devices at intervals along its axial direction.

5. The novel rotary kiln mixing mechanism according to claim 1, characterized in that, The limiting wheel is a rubber wheel, which includes an inner wheel core and an outer wheel sleeve. The outer wheel sleeve is detachably fitted onto the outside of the inner wheel core. The overall diameter of the limiting wheel can be adjusted by replacing the outer wheel sleeve with one of different thicknesses.

6. The novel rotary kiln mixing mechanism according to claim 5, characterized in that, The outer surface of the limiting wheel is provided with anti-slip texture, which is annular protrusions that are evenly distributed along the circumference of the limiting wheel.

7. A novel rotary kiln mixing mechanism according to claim 1, characterized in that, It also includes a rotating ring and a stationary ring. The rotating ring is fixedly sleeved on the drive shaft, and the stationary ring is fixed to the cylinder wall of the rotary kiln. The outer ring of the rotating ring and the inner ring of the stationary ring are sealed and fitted together, and the mating surfaces of the rotating ring and the stationary ring are coated with sealing grease.

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