Rotary kiln head fixed screen screening device and rotary kiln

Abstract

This disclosure relates to the field of rotary kiln technology, and more particularly to a rotary kiln head fixed screen screening device and a rotary kiln. This disclosure provides a rotary kiln head fixed screen screening device, including screen beam protective components and multiple screen beam bodies. One side of each screen beam body is connected to a lower water beam, and the opposite side is connected to a higher water beam. Multiple screen beam bodies are spaced apart along the extension directions of the higher and lower water beams. The screen beam protective components are detachably connected to the screen beam bodies. The screen beam protective components include a material discharge guide and multiple screen beam protective sleeves. The multiple screen beam protective sleeves are evenly distributed along the extension direction of the screen beam bodies. The material discharge guide is connected to the screen beam protective sleeves and is disposed between adjacent screen beam bodies. This disclosure can change the material discharge point in the receiving area of ​​the annular cooler based on the material flow direction and scouring point of the material entering the annular cooler, thereby reducing the scouring and wear of the external refractory material of the steel armor and extending the downtime maintenance cycle.

Description

Technical Field

[0001] This disclosure relates to the field of rotary kiln technology, and in particular to a rotary kiln head fixed screen screening device and a rotary kiln. Background Technology

[0002] A rotary kiln is a widely used piece of equipment in industries such as metallurgy, building materials, and chemicals, primarily for high-temperature calcination of materials. A rotary kiln typically consists of a long, cylindrical kiln body that rotates along a horizontal axis. Materials enter through the feed end of the kiln body and are subjected to high temperatures and physical forces during the kiln's rotation, ultimately completing the calcination or other reaction processes. The inner wall of the rotary kiln is lined with refractory material, enabling it to withstand high temperatures.

[0003] During the operation of the rotary kiln, the produced material passes through the fixed screen and reaches the receiving area of ​​the annular cooler due to the rotation and tilt of the rotary kiln. The receiving area includes an inner ring ball-blocking device, an outer ring ball-blocking device, a flat material pile, and a retaining wall. The outside is wrapped with refractory material. After the material enters the receiving area through the fixed screen from the rotary kiln, it continuously washes over the refractory material. When the refractory material is completely washed away, the red-hot material will burn the outer steel armor red-hot and may even cause the steel frame to burn through and fall off, or cause the machine to stop. Summary of the Invention

[0004] This disclosure aims to address at least one of the technical problems existing in the prior art or related technologies.

[0005] To this end, a first aspect of this disclosure provides a rotary kiln head fixed screen screening device, including a screen beam protective component and a plurality of screen beam bodies. One side of each screen beam body is connected to a lower water beam, and the opposite side is connected to a higher water beam. The plurality of screen beam bodies are spaced apart along the extending directions of the higher and lower water beams. The screen beam protective component is detachably connected to the screen beam body.

[0006] The screen beam protection component includes a material drop guide and multiple screen beam protective sleeves. The multiple screen beam protective sleeves are evenly distributed along the extension direction of the screen beam body. The material drop guide is connected to the screen beam protective sleeve and is disposed between adjacent screen beam bodies.

[0007] In one feasible implementation, the material guide includes a first body and a second body, which are respectively connected to two opposing screen beam protective sleeves.

[0008] In one feasible implementation, the first body and the second body are detachably connected.

[0009] In one feasible implementation, the material guide is configured as two sets.

[0010] In one feasible implementation, the number of the material discharge guides is set to multiple, and the multiple material discharge guides are respectively connected to the screen beam protective sleeve.

[0011] In one feasible implementation, the material guide is detachably connected to the screen beam protective sleeve.

[0012] In one feasible implementation, a protective plate is further included, which is disposed on the surface of the material drop guide that contacts the material, and the protective plate is detachably connected to the material drop guide.

[0013] In one feasible implementation, the material guide has a plurality of material receiving grooves, the extending direction of which is consistent with the extending direction of the material guide.

[0014] In one feasible implementation, the number of screen beam bodies is set to four.

[0015] A second aspect of this disclosure provides a rotary kiln, including the aforementioned rotary kiln head fixed screen screening device.

[0016] Compared with the prior art, this disclosure has at least the following beneficial effects: The screen beam protective sleeve of this disclosure is detachably connected to the screen beam body. The screen beam protective sleeve includes a material drop guide and multiple screen beam protective sleeves. The multiple screen beam protective sleeves are evenly distributed along the extension direction of the screen beam body to reduce the wear of the screen beam body and increase its service life. The installation position of the screen beam protective sleeve is adjusted according to the material flow direction and scouring point of the material entering the annular cooler, thereby adjusting the position of the material drop guide between adjacent screen beam bodies, so as to realize the change of the material drop point of the material flow in the receiving area of ​​the annular cooler, thereby reducing the scouring and wear of the refractory material on the outside of the steel armor and extending the downtime maintenance cycle. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0018] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of exemplary embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0020] Figure 1 This is a schematic diagram of the stereoscopic structure of this disclosure;

[0021] Figure 2 For this disclosure Figure 1 Enlarged view of the structure at point A;

[0022] Figure 3 This is a schematic diagram of the structure of the low-level water beam, the high-level water beam, and the screen beam body disclosed in this invention;

[0023] Figure 4 This is a schematic diagram of the structure of the material retaining wall and the flat material block in this disclosure.

[0024] in, Figures 1 to 4 The correspondence between the reference numerals and component names in the attached drawings is as follows: 1-screen beam protection component; 11-material drop guide component; 111-first body; 112-second body; 113-material receiving trough; 12-screen beam protection sleeve; 2-multiple screen beam bodies; 3-low-position water beam; 4-high-position water beam; 5-material retaining wall; 6-flat material pile. Detailed Implementation

[0025] To better understand the above-mentioned objectives, features, and advantages of this disclosure, the solutions disclosed herein will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0026] Numerous specific details are set forth in the following description in order to provide a full understanding of this disclosure, but this disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some, and not all, of the embodiments of this disclosure.

[0027] Currently, during the operation of the rotary kiln, the produced material passes through the fixed screen to the receiving area of ​​the annular cooler due to the rotation and tilt of the rotary kiln. The receiving area includes an inner ring ball-blocking device, an outer ring ball-blocking device, a flat material pile, and a retaining wall. The outside is wrapped with refractory material. After the material enters the receiving area through the fixed screen from the rotary kiln, it continuously washes over the refractory material. When the refractory material is completely washed away, the red-hot material will burn the outer steel armor red-hot, and may even cause the steel frame to burn through and fall off, or cause the machine to stop.

[0028] Based on this, the present disclosure provides a rotary kiln head fixed screen screening device. The screen beam protective sleeve of the present disclosure is detachably connected to the screen beam body. The screen beam protective sleeve includes a material drop guide and multiple screen beam protective sleeves. The multiple screen beam protective sleeves are evenly distributed along the extension direction of the screen beam body to reduce the wear of the screen beam body and increase its service life. The installation position of the screen beam protective sleeve is adjusted according to the material flow direction and scouring point of the material entering the annular cooler, thereby adjusting the position of the material drop guide between adjacent screen beam bodies, so as to realize the change of the material drop point of the material flow in the receiving area of ​​the annular cooler, thereby reducing the scouring and wear of the refractory material on the outside of the steel armor and extending the downtime maintenance cycle.

[0029] The following is a detailed description of the rotary kiln head fixed screen screening device through specific embodiments:

[0030] Reference Figures 1 to 4 As shown, the first aspect of this disclosure provides a rotary kiln head fixed screen screening device, including a screen beam protection component 1 and multiple screen beam bodies 2. One side of the screen beam body 2 is connected to a low water beam 3, and the opposite side is connected to a high water beam 4. The multiple screen beam bodies 2 are spaced apart along the extension direction of the high water beam 4 and the low water beam 3. The screen beam protection component 1 is detachably connected to the screen beam body 2. The screen beam protection component 1 includes a material drop guide component 11 and multiple screen beam protection sleeves 12. The multiple screen beam protection sleeves 12 are evenly distributed along the extension direction of the screen beam body 2. The material drop guide component 11 is connected to the screen beam protection sleeves 12 and is disposed between adjacent screen beam bodies 2.

[0031] The screen beam protection component 1 disclosed herein is detachably connected to the screen beam body 2. The screen beam protection component 1 includes a material discharge guide 11 and multiple screen beam protective sleeves 12. The multiple screen beam protective sleeves 12 are evenly distributed along the extension direction of the screen beam body 2 to reduce wear on the screen beam body and increase its service life. The installation position of the screen beam protective sleeves is adjusted according to the material flow direction and scouring points in the annular cooler, thereby adjusting the position of the material discharge guide 11 between adjacent screen beam bodies 2. This changes the material discharge point in the receiving area of ​​the annular cooler, thus mitigating the scouring and wear of the refractory material on the steel armor and extending the downtime maintenance cycle. The linkage design of the material discharge guide 11 and the screen beam protective sleeves 12 in this disclosure ensures that the guide structure and screen beam protection are maintained synchronously.

[0032] Specifically, the multiple screen beam protective sleeves 12 disclosed herein separately cover the screen beam body 2, and can be partially replaced through detachable connections, avoiding the scrapping of the entire screen beam. Further, the outer layer of the screen beam protective sleeve 12 can be selected as silicon carbide ceramic with a thickness of 4mm to 6mm, and the inner layer is a heat-resistant steel bushing with a thickness of 6mm to 8mm, bonded together with a high-temperature adhesive to enhance the heat resistance of the screen beam protective sleeve 12. Alternatively, the screen beam protective sleeve 12 and the material guide 11 can be laser-clad with a titanium carbide coating (TiC, 0.2mm thick), with a surface roughness Ra≤0.4μm. Titanium carbide is a material with extremely high hardness, second only to diamond and cubic boron nitride. Laminating it onto the workpiece surface can significantly improve the surface wear resistance, extend the service life of the workpiece, and effectively prevent corrosive media from eroding the workpiece substrate, thereby improving the corrosion resistance of the workpiece.

[0033] The screen beam protective sleeve 12 disclosed herein can be fixed by using a U-shaped clamp and spring washer to accommodate thermal expansion. Alternatively, it can be designed with an adaptive feature, with the screen beam protective sleeve 12 being an elastic split structure made of Inconel 625 alloy and having pre-compressed spring plates on the inner wall to ensure a tight fit with the screen beam body 2 during gap adjustment.

[0034] In some embodiments, the material guide 11 includes a first body 111 and a second body 112, which are respectively connected to two opposite screen beam protective sleeves 12.

[0035] In this embodiment, the first body 111 and the second body 112 of this disclosure are two sets of symmetrically arranged guide plates. The two completely occupy the gap (inlet) between the screen beam bodies within the width range of the material drop guide 11, so as to completely divide the inlet into two areas, thereby realizing the change of the material drop point of the receiving area of ​​the ring cooler.

[0036] In some embodiments, the first body 111 and the second body 112 are detachably connected. In this embodiment, the first body 111 and the second body 112 are detachably connected by plugging or bolting. Specifically, the first body 111 and the second body 112 are plugged in via a dovetail joint and secured with an M8 bolt.

[0037] In some embodiments, the material guide 11 is configured as two sets.

[0038] In this embodiment, the two sets of material guides 11 disclosed herein can enable the inlet to form a multi-channel flow guide, adapting to different material flow rates.

[0039] In some embodiments, the number of material discharge guides 11 is set to multiple, and the multiple material discharge guides 11 are respectively connected to the screen beam protective sleeve 12.

[0040] In this embodiment, multiple material guides 11 are provided, each connected to the screen beam protective sleeve 12. By changing the position of the screen beam protective sleeve 12, the material flow can be more precisely adjusted to change the material drop point in the receiving area of ​​the annular cooler. For example, the material guide 11 can be set to occupy half the width of the inlet, and alternately arranged on the screen beam protective sleeve 12. The specific arrangement can be adapted according to the actual situation during use. Furthermore, the material guide 11 is detachably connected to the screen beam protective sleeve 12, and its position can be changed without moving the screen beam protective sleeve 12 to cope with situations where the screen beam protective sleeve 12 is jammed or damaged.

[0041] In some embodiments, a protective plate is also included, which is disposed on the surface of the material drop guide 11 that contacts the material, and the protective plate is detachably connected to the material drop guide 11.

[0042] In this embodiment, the protective plate can be independently disassembled and replaced, reducing single maintenance time by 70% and eliminating the need for overall machine shutdown. Specifically, the protective plate can be a removable tungsten carbide protective plate, fixed to the guide surface with countersunk bolts. Alternatively, it can be a double-layer structure, with a 310S steel plate as the base layer and a tungsten carbide alloy layer welded to the surface. Another option is a honeycomb ceramic structure with 1mm pores, through which compressed air (0.2MPa) is circulated to form an air film isolation layer. By using the protective plate, the wear rate of the material guide component 11 is reduced by more than 60%, and its service life is extended to 2 to 3 times that of traditional structures.

[0043] In some embodiments, the material guide 11 has a plurality of receiving grooves 113, the extending direction of the receiving grooves 113 being consistent with the extending direction of the material guide 11.

[0044] In this embodiment, the receiving trough 113 is arranged along the extension direction of the guide member, with a depth of 5mm to 10mm and a width matching the screening gap, guiding the material to fall evenly and avoiding accumulation. The receiving trough 113 of this disclosure guides the material to flow in a directional manner, improving the screening efficiency by about 30% and reducing the return rate of large particles to below 5%. Specifically, the depth of the receiving trough 113 can be increased to 12mm, the trough wall inclination angle is 60°, and wear-resistant ceramic strips are embedded in the trough to increase wear resistance. When the material falls, it first contacts the guard plate of the falling guide member 11, and the impact force is dispersed by the receiving trough 113. Furthermore, the receiving trough (113) is equipped with an anti-clogging component, specifically a vibration motor with a frequency of 50Hz and an amplitude of 2mm is installed at the bottom of the trough to prevent material accumulation through periodic micro-vibration.

[0045] In some embodiments, the number of screen beam bodies 2 is set to four. In this embodiment, the four screen beam bodies 2 are arranged at intervals, and the screening gap is adjustable according to the particle size of the material.

[0046] A second aspect of this disclosure provides a rotary kiln, including a rotary kiln head fixed screen screening device provided in the first aspect of this disclosure.

[0047] In this disclosure, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise expressly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0048] In the description of this disclosure, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or unit 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 disclosure.

[0049] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0050] The above are merely preferred embodiments of this disclosure and are not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A rotary kiln head fixed screen screening device, characterized in that, The system includes a screen beam protector and multiple screen beam bodies. One side of each screen beam body is connected to a lower water beam, and the opposite side is connected to a higher water beam. The multiple screen beam bodies are spaced apart along the extending directions of the higher and lower water beams. The screen beam protector is detachably connected to the screen beam body. The screen beam protection component includes a material drop guide and multiple screen beam protective sleeves. The multiple screen beam protective sleeves are evenly distributed along the extension direction of the screen beam body. The material drop guide is connected to the screen beam protective sleeve and is disposed between adjacent screen beam bodies.

2. The rotary kiln head fixed screen screening device according to claim 1, characterized in that, The material guide includes a first body and a second body, which are respectively connected to two opposite screen beam protective sleeves.

3. The rotary kiln head fixed screen screening device according to claim 2, characterized in that, The first body and the second body are detachably connected.

4. The rotary kiln head fixed screen screening device according to claim 2, characterized in that, The material guide is configured in two sets.

5. The rotary kiln head fixed screen screening device according to claim 1, characterized in that, The number of material discharge guides is set to multiple, and the multiple material discharge guides are respectively connected to the screen beam protective sleeve.

6. The rotary kiln head fixed screen screening device according to claim 1, characterized in that, The material guide is detachably connected to the screen beam protective sleeve.

7. The rotary kiln head fixed screen screening device according to claim 1, characterized in that, It also includes a guard plate, which is disposed on the surface of the material drop guide that contacts the material, and the guard plate is detachably connected to the material drop guide.

8. The rotary kiln head fixed screen screening device according to claim 1, characterized in that, The material drop guide has multiple material receiving grooves, and the extending direction of the material receiving grooves is consistent with the extending direction of the material drop guide.

9. The rotary kiln head fixed screen screening device according to claim 1, characterized in that, The number of screen beams is set to four.

10. A rotary kiln, characterized in that, The rotary kiln head fixed screen screening device includes any one of claims 1 to 9 above.

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