A rotary kiln material guiding spiral structure and rotary kiln

Abstract

The present invention provides a rotary kiln material guiding spiral structure and a rotary kiln, comprising: a furnace barrel body, the furnace barrel body is a hollow structure, a plurality of long fixed circular tubes and short fixed circular tubes are evenly spaced on the inner wall of the furnace barrel body, a first groove is symmetrically arranged on the left and right sides of the long fixed circular tube, a second groove is symmetrically arranged on the left and right sides of the short fixed circular tube, a plurality of material guiding plates, the material guiding plates pass through the two second grooves on the short fixed circular tubes, and the two ends of the material guiding plates respectively extend into the first grooves on the two long fixed circular tubes adjacent to the short fixed circular tubes, the plurality of material guiding plates form a spiral structure, a U-shaped groove is arranged on the side of the material guiding plate close to the furnace barrel body, a gap is provided between the material guiding plate and the furnace barrel body, there is a gap between adjacent material guiding plates, and a U-shaped groove is opened on the material guiding plate, so that the expansion amount generated by the material guiding plate during heating can expand in the direction of the gap, thereby avoiding obstruction of material discharge and improving the production efficiency of the rotary kiln.

Description

Technical Field

[0001] The invention relates to the technical field of chemical equipment and chemical machinery design and manufacturing, and in particular to a rotary kiln material guiding spiral structure and a rotary kiln. Background Art

[0002] In the field of coal chemical industry, rotary kiln equipment is widely used, such as cement rotary kiln, hydrofluoric acid reactor, material drying furnace, coal pyrolysis rotary kiln, etc. The above-mentioned rotary kilns all process materials by heating. In the feeding and discharging section of the rotary kiln, a material guide spiral is generally designed for rapid feeding and discharging.

[0003] For example, in a coal pyrolysis rotary reactor, the material guide spiral in the high-temperature section is generally welded directly to the barrel. During operation at high temperatures of 500°C to 800°C, the material guide spiral and the barrel expand due to the heat, but the direction and amount of expansion cannot be controlled, resulting in cracks in the weld between the material guide spiral and the barrel. In severe cases, the material guide spiral may fall off and get stuck in the discharge port of the rotary furnace, causing discharge obstruction and forced shutdown. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art that the expansion direction and expansion amount of the material guiding spiral are uncontrollable and will affect the discharge efficiency, thereby providing a rotary kiln material guiding spiral structure and a rotary kiln.

[0005] In order to solve the above problems, the present invention provides a rotary kiln material guiding spiral structure, comprising:

[0006] The furnace body is a hollow structure.

[0007] A plurality of long fixed circular tubes and short fixed circular tubes are evenly spaced on the inner wall of the furnace body, the left and right sides of the long fixed circular tubes are symmetrically provided with first grooves, and the left and right sides of the short fixed circular tubes are symmetrically provided with second grooves.

[0008] A plurality of material guide plates, wherein the material guide plates pass through the two second grooves on the short fixed circular tube, and the two ends of the material guide plates respectively extend into the first grooves on the two long fixed circular tubes adjacent to the short fixed circular tube, the plurality of material guide plates form a spiral structure, and a cover plate is provided on the side of the long fixed circular tube away from the furnace body;

[0009] Wherein, rectangular grooves suitable for determining welding points are arranged on the end surfaces of the long fixed circular tube, the short fixed circular tube and the material guide plate on one side close to the furnace barrel body.

[0010] Preferably, a plurality of U-shaped grooves are provided on the side wall of the guide plate, and the U-shaped grooves are suitable for releasing the self-expansion force of the guide plate.

[0011] Preferably, the furnace body, the material guide plate, the long fixed circular tube, the short fixed circular tube and the cover plate are all made of high temperature resistant stainless steel.

[0012] Preferably, the furnace body, the guide plate, the long fixed circular tube, the short fixed circular tube and the cover plate may be made of S31008 stainless steel, S30815 stainless steel, S30408 ​​stainless steel or other high temperature resistant stainless steel materials.

[0013] Preferably, the furnace body can be formed by rolling and welding.

[0014] Preferably, the diameter of the furnace body ranges from 1000 mm to 8000 mm, and the wall thickness ranges from 30 mm to 60 mm.

[0015] Preferably, a plurality of guide plates are provided, and the guide plates are fan-shaped;

[0016] The guide plate is installed through a spiral line to form a complete guide spiral structure;

[0017] The guide plate has a thickness range of 5 mm to 30 mm, a length range of 500 mm to 2000 mm, a height range of 100 mm to 800 mm, and a gap between the guide plate and the furnace body of 1 mm to 2 mm;

[0018] The middle position of the material guide plate passes through and is fixedly connected to the short fixed circular tube, and both ends of the material guide plate are in contact with and connected to the long fixed circular tube.

[0019] Preferably, the long fixed round tube is a cylindrical structure, the diameter of the long fixed round tube generally ranges from 50 mm to 300 mm, the height generally ranges from 100 mm to 800 mm, and the wall thickness generally ranges from 10 mm to 30 mm.

[0020] Preferably, the short fixed circular tube is a cylindrical structure, the diameter of the short fixed circular tube generally ranges from 50 mm to 300 mm, the height generally ranges from 100 mm to 800 mm, and the wall thickness generally ranges from 10 mm to 30 mm.

[0021] Preferably, a rotary kiln comprises the rotary kiln material guiding spiral structure, wherein the rotary kiln material guiding spiral structure is fixedly connected to the rotary kiln.

[0022] The present invention has the following advantages:

[0023] The structure mainly fixes the guide plate on the inner wall of the rotary furnace shell by long fixed round tubes and short fixed round tubes, so that there is a gap between the guide plate and the inner wall of the furnace shell, and there is a gap between adjacent guide plates, so that the guide plate can expand and contract freely when the rotary furnace is running at high temperature, and stably push the material forward. The side of the guide plate is provided with a U-shaped groove, which can accommodate the expansion of the guide plate, thereby preventing the expansion direction of the guide plate from hindering the advancement of the material. The structure is modular in manufacturing and installation, and has a low cost. It can provide a safe and stable spiral conveying structure for various high-temperature materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0026] Figure 2 For the present invention Figure 1 Schematic diagram of the local structure at A in the middle;

[0027] Figure 3 For the present invention Figure 2 Schematic diagram of the local structure at B in the middle;

[0028] Figure 4 It is a structural schematic diagram of the connection between the long fixed circular tube and the guide plate of the present invention;

[0029] Figure 5 It is a schematic structural diagram of the connection between the short fixed circular tube and the material guide plate of the present invention.

[0030] Explanation of the accompanying drawings: 1. furnace body; 2. material guide plate; 3. long fixed circular tube; 4. short fixed circular tube; 5. U-shaped groove; 6. cover plate; 7. rectangular groove; 8. first groove; 9. second groove. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0035] Example

[0036] In one embodiment, see Figure 1-Figure 5 The present invention provides a rotary kiln material guiding spiral structure, comprising:

[0037] The furnace body 1 is a hollow structure.

[0038] A plurality of long fixed circular tubes 3 and short fixed circular tubes 4 are evenly spaced on the inner wall of the furnace body 1. The left and right sides of the long fixed circular tubes 3 are symmetrically provided with first grooves 8, and the left and right sides of the short fixed circular tubes 4 are symmetrically provided with second grooves 9.

[0039] A plurality of guide plates 2, the guide plates 2 pass through two second grooves 9 on the short fixed circular tube 4, and both ends of the guide plates 2 extend into the first grooves 8 on two long fixed circular tubes 3 adjacent to the short fixed circular tube 4, the plurality of guide plates 2 form a spiral structure, and a cover plate 6 is provided on one side of the long fixed circular tube 3 away from the furnace body 1;

[0040] Specifically, there is a gap between the material guide plate 2 and the furnace body 1, the material guide plate 2 and the short fixed circular tube 4 are welded and fixed, and there is a gap fit between the two ends of the material guide plate 2 and the long fixed circular tube 3, and the gap is generally 1 mm. If necessary, the width of the gap can be appropriately adjusted, and the two ends of the material guide plate 2 can expand and contract freely.

[0041] Among them, rectangular grooves 7 suitable for determining welding points are arranged on the end surfaces of the long fixed circular tube 3, the short fixed circular tube 4 and the material guide plate 2 on one side close to the furnace body 1.

[0042] Specifically, multiple groups of rectangular grooves 7 are provided, and the rectangular grooves 7 are evenly spaced; the rectangular grooves 7 on the long fixed circular tube 3 and the short fixed circular tube 4 are provided on the end surface close to the furnace body 1, the rectangular grooves 7 on the guide plate 2 are provided at the middle position where the guide plate 2 and the short fixed circular tube 4 are connected, and a rectangular groove 7 can also be provided in the second groove 9 on the short fixed circular tube 4, and the furnace body 1 is provided with rectangular grooves 7 at positions corresponding to the rectangular grooves 7 on the long fixed circular tube 3 and the short fixed circular tube 4.

[0043] The long fixed circular tube 3 and the short fixed circular tube 4 are both made of hollow tubes, and their cross-sections are circular. One ends of the long fixed circular tube 3 and the short fixed circular tube 4 are welded and fixed to the furnace body 1 through a rectangular groove 7. The fixed end of the guide plate 2 (i.e., the middle position of the guide plate 2) is welded to the second groove 9 in the short fixed plate 4 through the rectangular groove 7. The non-fixed ends of the guide plate 2 (i.e., the two ends of the guide plate 2) are inserted into the first groove 8 on the side of the long fixed circular tube 3. The distance between adjacent guide plates 2 is generally 10 mm-30 mm. If necessary, the distance can be appropriately adjusted, and then the rectangular groove on the guide plate 2 is welded to the inner wall of the furnace body 1.

[0044] Optionally, a plurality of U-shaped grooves 5 are provided on the side wall of the material guide plate 2 , and the U-shaped grooves 5 are suitable for releasing the self-expansion force of the material guide plate 2 .

[0045] Specifically, during the process of thermal expansion and contraction, the gap in the U-shaped groove 5 provided on the material guide plate 2 can make the expansion amount of the material guide plate 2 expand in the direction of the U-shaped groove 5, thereby reducing the instability of thermal expansion of the material guide plate 2.

[0046] Optionally, the furnace body 1, the material guide plate 2, the long fixed circular tube 3, the short fixed circular tube 4, and the cover plate 6 are all made of high temperature resistant stainless steel.

[0047] Optionally, the furnace body 1, the guide plate 2, the long fixed circular tube 3, the short fixed circular tube 4, and the cover plate 6 may be made of S31008 stainless steel, S30815 stainless steel, S30408 ​​stainless steel, or other high temperature resistant stainless steel materials.

[0048] Specifically, after the guide plate 2 is installed, the top of the long fixed circular tube 3 is welded and fixed with a cover plate 6 . The stainless steel material has a good corrosion resistance, thereby increasing the service life of the guide plate 2 .

[0049] Optionally, the furnace body 1 can be formed by rolling and welding.

[0050] Optionally, the diameter of the furnace body 1 ranges from 1000 mm to 8000 mm, and the wall thickness ranges from 30 mm to 60 mm.

[0051] In an alternative embodiment, the material of the furnace body 1 is not limited and can be made of high temperature resistant ceramic material or cement. It only needs to protect the internal structure of the furnace body 1 and have good heat dissipation and wear resistance.

[0052] Optionally, a plurality of guide plates 2 are provided, and the guide plates 2 are fan-shaped;

[0053] The guide plate 2 is installed through a spiral line to form a complete guide spiral structure;

[0054] The thickness of the guide plate 2 is in the range of 5 mm to 30 mm, the length is in the range of 500 mm to 2000 mm, the height is in the range of 100 mm to 800 mm, and the gap between the guide plate 2 and the furnace body 1 is in the range of 1 mm to 2 mm;

[0055] The middle position of the material guide plate 2 is fixedly connected to the short fixed circular tube 4 , and both ends of the material guide plate 2 penetrate and connect to the first groove 8 on the long fixed circular tube 3 .

[0056] Optionally, both ends of the material guide plate 2 respectively pass through the first groove 8 set on the long fixed circular tube 3, the long fixed circular tube 3 and the short fixed circular tube 4 are installed on the inner wall of the furnace body 1 in a spiral line, and the material guide plate 2 is installed on one side of the long fixed circular tube 3 and the short fixed circular tube 4, and can be installed in a spiral line to form a complete material guide spiral structure.

[0057] Optionally, the long fixed circular tube 3 is a cylindrical structure, the diameter of the long fixed circular tube 3 is generally in the range of 50 mm to 300 mm, the height is generally in the range of 100 mm to 800 mm, and the wall thickness is generally in the range of 10 mm to 30 mm.

[0058] Optionally, the short fixed circular tube 4 is a cylindrical structure, the diameter of the short fixed circular tube 4 is generally in the range of 50 mm to 300 mm, the height is generally in the range of 100 mm to 800 mm, and the wall thickness is generally in the range of 10 mm to 30 mm.

[0059] Specifically, the long fixed circular tube 3 and the short fixed circular tube 4 are both made of hollow tubes with circular cross-sections.

[0060] Optionally, a rotary kiln includes a rotary kiln material guiding spiral structure, wherein the rotary kiln material guiding spiral structure is fixedly connected to the rotary kiln.

[0061] The working principle of the above technical solution is as follows: first, rectangular grooves 7 are opened on the inner wall of the furnace barrel 1, one side of the material guide plate 2, one side of the long fixed circular tube 3, and one side of the short fixed circular tube 4; then, the long fixed circular tube 3 and the short fixed circular tube 4 are welded to the rectangular groove 7 on the inner wall of the furnace barrel 1 through the rectangular groove 7; then, the material guide plate 2 passes through the first groove 8 on the long fixed circular tube 3 and the second groove 9 on the short fixed circular tube 4; after the installation of the material guide plate 2 is completed, the rectangular grooves 7 on the material guide plate 2 and the second groove 9 on the short fixed circular tube 4 are welded together; then, the cover plate 6 on the side of the long fixed circular tube 3 facing away from the inner wall of the furnace barrel 1 is welded to the long fixed circular tube 3; thus, the installation of the material guide spiral structure is completed; and then the installed furnace barrel 1 can be installed on the rotary furnace.

[0062] During use, the internal temperature of the furnace barrel 1 is relatively high, and the spiral-shaped guide plate 2 can facilitate the introduction or export of materials, and the furnace barrel 1 and its internal structure will expand under high temperature conditions. During the expansion process, a gap is provided between the guide plate 2 and the furnace barrel 1 to prevent the guide plate 2 from damaging the furnace barrel 1 during its outward expansion. Gaps are provided between adjacent guide plates 2 to prevent adjacent guide plates 2 from stacking and folding during the expansion process to affect material discharge, and a U-shaped groove 5 is provided on the side of the guide plate 2 to prevent the guide plate 2 from wrinkling on the side close to the material due to expansion, thereby increasing friction and reducing the material discharge speed, thereby reducing material accumulation at the discharge port and improving production efficiency.

[0063] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A rotary kiln material guiding spiral structure, characterized in that: include: A furnace barrel (1), wherein the furnace barrel (1) is a hollow structure. A plurality of long fixed circular tubes (3) and short fixed circular tubes (4) are evenly spaced on the inner wall of the furnace body (1); first grooves (8) are symmetrically arranged on the left and right sides of the long fixed circular tubes (3); and second grooves (9) are symmetrically arranged on the left and right sides of the short fixed circular tubes (4). a plurality of material guide plates (2), the material guide plates (2) passing through the two second grooves (9) on the short fixed circular tube (4), and the two ends of the material guide plates (2) respectively extending into the first grooves (8) on the two long fixed circular tubes (3) adjacent to the short fixed circular tube (4), the plurality of material guide plates (2) forming a spiral structure, and a cover plate (6) is provided on a side of the long fixed circular tube (3) facing away from the furnace barrel (1); Wherein, rectangular grooves (7) suitable for determining welding points are provided on the end surfaces of the long fixed circular tube (3), the short fixed circular tube (4) and the guide plate (2) on one side close to the furnace barrel (1); The long fixed circular tube (3) and the short fixed circular tube (4) are installed on the inner wall of the furnace barrel (1) in a spiral line, and the material guide plate (2) is installed on one side of the long fixed circular tube (3) and the short fixed circular tube (4) so ​​as to form a complete material guide spiral structure by installing the spiral line; There is a gap between the guide plate (2) and the furnace body (1), and the guide plate (2) and the short fixed circular tube (4) are fixed by welding; The furnace barrel (1) is provided with a rectangular groove (7) at a position corresponding to the rectangular grooves (7) on the long fixed circular tube (3) and the short fixed circular tube (4).

2. The rotary kiln material guiding spiral structure according to claim 1, characterized in that: include: A plurality of U-shaped grooves (5) are provided on the side wall of the material guide plate (2), and the U-shaped grooves (5) are suitable for releasing the self-expansion force of the material guide plate (2).

3. The rotary kiln material guiding spiral structure according to claim 1, characterized in that: include: The furnace barrel (1), the material guide plate (2), the long fixed circular tube (3), the short fixed circular tube (4), and the cover plate (6) are all made of high-temperature resistant stainless steel.

4. The rotary kiln material guiding spiral structure according to claim 1, characterized in that: include: The furnace body (1), the guide plate (2), the long fixed circular tube (3), the short fixed circular tube (4), and the cover plate (6) are made of S31008 stainless steel, S30815 stainless steel, S30408 ​​stainless steel, or other high-temperature resistant stainless steel materials.

5. The rotary kiln material guiding spiral structure according to claim 1, characterized in that: include: The furnace barrel body (1) is formed by rolling and welding.

6. The rotary kiln material guiding spiral structure according to claim 1, characterized in that: include: The diameter of the furnace barrel (1) ranges from 1000 mm to 8000 mm, and the wall thickness ranges from 30 mm to 60 mm.

7. The rotary kiln material guiding spiral structure according to claim 1, characterized in that: include: A plurality of the guide plates (2) are provided, and the guide plates (2) are fan-shaped; The material guide plate (2) is installed via a spiral line to form a complete material guide spiral structure; The guide plate (2) has a thickness ranging from 5 mm to 30 mm, a length ranging from 500 mm to 2000 mm, a height ranging from 100 mm to 800 mm, and a gap between the guide plate (2) and the furnace barrel (1) ranging from 1 mm to 2 mm; The middle position of the material guide plate (2) passes through and is fixedly connected to the short fixed circular tube (4), and both ends of the material guide plate (2) are in contact with and connected to the long fixed circular tube (3).

8. The rotary kiln material guiding spiral structure according to claim 1, characterized in that: include: The long fixed circular tube (3) is a cylindrical structure, the diameter of the long fixed circular tube (3) is in the range of 50 mm to 300 mm, the height is in the range of 100 mm to 800 mm, and the wall thickness is in the range of 10 mm to 30 mm.

9. The rotary kiln material guiding spiral structure according to claim 1, characterized in that: include: The short fixed circular tube (4) is a cylindrical structure, the diameter of the short fixed circular tube (4) is in the range of 50 mm to 300 mm, the height is in the range of 100 mm to 800 mm, and the wall thickness is in the range of 10 mm to 30 mm.

10. A rotary kiln, characterized in that: It comprises a rotary kiln material guiding spiral structure according to any one of claims 1 to 9, wherein the rotary kiln material guiding spiral structure is fixedly connected to the rotary kiln.

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