Rotary hearth kiln

Abstract

The utility model relates to a rotary hearth kiln, an annular material groove is arranged on the top surface of the kiln bottom, and the bottom surface of a spiral discharge shaft is attached to the top surface of the material groove. When the rotary hearth kiln works, materials are left in the material groove, when the spiral discharging shaft stirs the materials above the material groove to be discharged, the materials left in the material groove prevent the kiln bottom from being stretched and damaged by the spiral discharging shaft, and the kiln bottom is protected. The utility model has the advantages of protecting the kiln bottom, prolonging the service life of the rotary hearth kiln, enhancing the working stability of the rotary hearth kiln and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal equipment, in particular to a rotary bottom kiln. Background Art

[0002] The rotary kiln is a device that uses a rotatable kiln bottom to drive the saggers containing materials placed on it to heat them in the kiln. The kiln body is usually designed in a ring shape and has a gap, so that the saggers containing the materials to be heated can be placed on the rotating kiln bottom from the gap, and then the kiln bottom brings the saggers into the kiln for heating. After the materials are heated, they return to the gap through the kiln bottom for discharge, realizing continuous, rapid and efficient heating and sintering of the materials. This technology is widely used in metallurgy, chemical industry, ceramics and other industries.

[0003] However, this process is rather cumbersome and requires a large amount of heat to heat the sagger, and the sagger needs to be replaced regularly, which not only increases production costs but also affects production efficiency.

[0004] To solve these problems, an oscillating feeder is usually installed at the notch, and the material to be heated and sintered is directly laid on the surface of the kiln bottom using the machine. The material is brought into the kiln from the kiln bottom for heating. In addition, a spiral discharger is also configured at the notch to ensure that the bottom surface of the spiral discharge shaft is completely in contact with the surface of the kiln bottom. When the spiral discharge shaft rotates, the heated material on the kiln bottom is effectively brought out.

[0005] Although this method improves production efficiency and reduces costs, many materials will stick to the wall during the heating and sintering process, such as the sintering of lithium battery positive electrode materials. The moisture and impurities in the raw materials lead to the production of impurities such as tar, which will adhere to the surface of the kiln bottom. As a result, when the spiral discharge shaft rotates to discharge materials, the surface of the kiln bottom is stretched and damaged by the adhered impurities, which shortens the service life of the rotary kiln and reduces its working stability. Utility Model Content

[0006] To this end, the utility model provides a rotary kiln, which mainly solves the technical problem that the kiln bottom surface of the rotary kiln in the prior art is easily stretched and damaged, which shortens the service life of the rotary kiln and reduces its working stability.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A rotary bottom kiln comprises a base; an annular kiln body is arranged on the base; an outer liner is arranged on the inner side of the outer wall of the kiln body, and an inner liner is arranged on the inner side of the inner wall; a kiln cover is arranged between the top of the outer liner and the top of the inner liner; the base is rotatably provided with an annular kiln bottom for sealing the area between the bottom of the outer liner and the bottom of the inner liner; a first side wall and a second side wall are respectively arranged between the outer liner and the inner liner; the first side wall, the second side wall, the outer liner, the inner liner, the kiln cover and the kiln bottom form a kiln chamber; the kiln chamber is provided with a radiation tube for heating the material to be heated in the kiln chamber; a gap is formed between the side of the first side wall away from the kiln chamber and the side of the second side wall away from the kiln chamber and the kiln bottom; a material inlet; a material outlet is provided at the bottom of the second side wall; an oscillating feeder is provided in the notch in the material inlet area for spreading the material to be heated on the top surface of the kiln bottom; a spiral discharging machine is provided in the notch in the material outlet area for discharging the heated material; the spiral discharging machine comprises a discharging rack and a spiral discharging motor arranged on the kiln body; the discharging rack is rotatably provided with a spiral discharging shaft; the output shaft of the spiral discharging motor is connected to the spiral discharging shaft to drive the spiral discharging shaft to rotate; a kiln bottom driving device is also included for driving the kiln bottom to rotate; an annular material trough is provided on the top surface of the kiln bottom; the bottom surface of the spiral discharging shaft is in contact with the top surface of the material trough.

[0009] Optionally, the kiln bottom driving device includes a plurality of supporting wheels evenly distributed on the base; a kiln bottom support frame can be rotatably arranged on the supporting wheels; the kiln bottom is placed on the kiln bottom support frame; the base is also provided with a kiln bottom motor; the output shaft of the kiln bottom motor is connected to the kiln bottom support frame to drive the kiln bottom support frame to rotate.

[0010] Preferably, the discharge port of the oscillating feeder is provided with a material trough; the bottom of the material trough is located above the material trough; and the width of the material trough is smaller than the width of the material trough.

[0011] Preferably, an outer protective platform is formed between the material trough and the outer side of the kiln bottom, and an inner protective platform is formed between the material trough and the inner side of the kiln bottom.

[0012] Optionally, the radiation tube is arranged at the bottom of the kiln cover.

[0013] Optionally, the outer wall is provided with an exhaust port communicating with the kiln chamber.

[0014] Preferably, a discharge trough is provided below the outer wall side of the spiral discharge shaft.

[0015] Furthermore, the outer tank, the inner tank and the kiln cover are all made of high-temperature refractory materials.

[0016] Furthermore, a protective layer is laid on the bottom of the material trough; the protective layer is made of corundum castable material.

[0017] Furthermore, the outer surface of the spiral blade of the spiral discharging shaft is affixed with a wear-resistant ceramic sheet.

[0018] The utility model has at least the following beneficial effects:

[0019] An annular material trough is provided on the top surface of the kiln bottom, and the bottom surface of the spiral discharging shaft is in contact with the top surface of the material trough. In this way, when the rotary kiln of the present application is working, materials will remain in the material trough. When the spiral discharging shaft moves the materials above the material trough to discharge, the materials remaining in the material trough prevent the kiln bottom from being stretched and damaged by the spiral discharging shaft, thereby protecting the kiln bottom, extending the service life, and enhancing the working stability.

[0020] Furthermore, the outer tank, inner tank and kiln cover are all made of high temperature refractory materials, which prolongs the service life, reduces the maintenance frequency, saves costs and improves production efficiency.

[0021] Furthermore, a protective layer is laid at the bottom of the material trough, and the protective layer is made of corundum castable material to reduce the sticking of materials to the wall during heating and protect the kiln bottom.

[0022] Furthermore, a wear-resistant ceramic sheet is attached to the outer surface of the spiral blade of the spiral discharging shaft to delay the wear of the blade.

[0023] It can be seen that the rotary kiln of the utility model has the advantages of protecting the kiln bottom, extending the service life of the rotary kiln, and enhancing the working stability of the rotary kiln. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly explain the prior art and the present invention, the following briefly introduces the drawings required for describing the prior art and the present invention. Obviously, the drawings described below are only exemplary, and for ordinary technicians in this field, other drawings can be derived from the provided drawings without creative work.

[0025] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportion or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0026] Figure 1 This is a cross-sectional view of a rotary kiln of the utility model;

[0027] Figure 2 This utility model is an accessory of a rotary bottom kiln Figure 1 AA section view;

[0028] Figure 3 This utility model is an accessory of a rotary bottom kiln Figure 1 BB section view;

[0029] Figure 4 This utility model is an accessory of a rotary bottom kiln Figure 1 CC section view;

[0030] Description of reference numerals:

[0031] 1. Outer liner; 2. Inner liner; 3. First side wall; 4. Second side wall; 5. Kiln chamber; 6. Exhaust port; 7. Notch; 8. Screw discharge motor; 9. Screw discharge shaft; 10. Discharge rack; 11. Oscillating feeder; 12. Material trough; 13. Kiln body; 1301. Outer wall; 1302. Inner wall; 14. Kiln bottom support frame; 15. Support wheel; 16. Base; 17. Kiln bottom; 1701. Material trough; 1702. Outer protection platform; 1703. Inner protection platform; 18. Protection layer; 19. Material; 20. Discharge trough; 21. Kiln cover; 22. Radiant tube. DETAILED DESCRIPTION

[0032] The present application is further described below in detail through specific embodiments in conjunction with the accompanying drawings.

[0033] In the description of this application: unless otherwise specified, the meaning of "plurality" is two or more. The terms "first", "second", "third", etc. in this application are intended to distinguish the objects referred to, and do not have special meanings in terms of technical connotations (for example, they should not be understood as emphasizing the importance or order, etc.). Expressions such as "including", "comprising", "having", etc. also mean "not limited to" (certain units, components, materials, steps, etc.).

[0034] The terms such as "upper", "lower", "left", "right", "middle", etc. used in this application are usually used to facilitate intuitive understanding by comparing with the accompanying drawings, and are not absolute limitations on the positional relationship in the actual product. Without departing from the technical concept disclosed in this application, changes in these relative positional relationships should also be regarded as the scope of this application.

[0035] The utility model provides a rotary bottom kiln, such as Figures 1 to 4As shown, a base 16 is provided, and the base 16 is generally a concrete foundation, and an annular kiln body 13 is fixedly provided on the base 16. An outer liner 1 is fixedly provided on the inner side of the outer wall 1301 of the kiln body 13, and an inner liner 2 is provided on the inner side of the inner wall 1302. A kiln cover 21 is provided between the top of the outer liner 1 and the top of the inner liner 2. The base 16 is rotatably provided with an annular kiln bottom 17, and the kiln bottom 17 closes the area between the bottom of the outer liner 1 and the bottom of the inner liner 2. A first side wall 3 and a second side wall 4 are provided between the outer liner 1 and the inner liner 2, respectively, and the first side wall 3, the second side wall 4, the outer liner 1, the inner liner 2, the kiln cover 21 and the kiln bottom 17 surround a kiln chamber 5. The kiln chamber 5 is provided with a radiation tube 22, and the radiation tube 22 can be selected to be heated by electric heating or gas heating to heat the material to be heated in the kiln chamber 5. A gap 7 is formed between the first side wall 3 away from the kiln chamber 5, the second side wall 4 away from the kiln chamber 5, and the kiln bottom 17. A material inlet is provided at the bottom of the first side wall 3, and a material outlet is provided at the bottom of the second side wall 4. An oscillating feeder 11 is provided at the notch 7 in the material inlet area, which is used to lay the material to be heated on the top surface of the kiln bottom 17, and a spiral discharger is provided at the notch 7 in the material outlet area, which is used to discharge the heated material. The spiral discharger includes a discharge rack 10 and a spiral discharge motor 8 arranged on the kiln body 13. The discharge rack 10 is rotatably provided with a spiral discharge shaft 9, and the output shaft of the spiral discharge motor 8 is connected to the spiral discharge shaft 9 to drive the spiral discharge shaft 9 to rotate. The above structures are all existing rotary kiln mechanisms well known to those skilled in the art. A kiln bottom driving device is also included, which is used to drive the kiln bottom 17 to rotate. The kiln bottom 17 rotates continuously under the drive of the kiln bottom driving device, and the material to be heated is laid on the top surface of the kiln bottom 17 by the oscillating feeder 11, enters the kiln chamber 5 from the material inlet for heating, and then rotates out from the material outlet, and is discharged under the toggle of the spiral discharge shaft 9. In order to prevent the spiral discharging shaft 9 from damaging the kiln bottom 17 during discharging, an annular material trough 1701 is opened on the top surface of the kiln bottom 17, and the bottom surface of the spiral discharging shaft 9 is in contact with the top surface of the material trough 1701. In this way, when the rotary kiln of this application is working, material 19 will remain in the material trough 1701. When the spiral discharging shaft 9 pushes the material above the material trough 1701 to discharge, the material 19 remaining in the material trough 1701 prevents the kiln bottom 17 from being stretched and damaged by the spiral discharging shaft 9, thereby protecting the kiln bottom 17, extending the service life, and enhancing the stability of operation.

[0036] Optionally, the kiln bottom driving device of the embodiment of the present application adopts the kiln bottom rotation driving device of the rotary kiln in the prior art, specifically: including a plurality of supporting wheels 15 evenly distributed on a base 16, a kiln bottom support frame 14 can be rotatably arranged on the supporting wheels 15, a kiln bottom 17 is placed on the kiln bottom support frame 14, and the base 16 is also provided with a kiln bottom motor, the output shaft of the kiln bottom motor is connected to the kiln bottom support frame 14, and drives the kiln bottom support frame 14 to rotate. This is a prior art well known to those skilled in the art and will not be described in detail here.

[0037] Preferably, in order to facilitate the feeding of the oscillating feeder 11, the discharge port of the oscillating feeder 11 is provided with a trough 12, and the bottom of the trough 12 is located above the material trough 1701. Because the material to be heated is laid on the material trough 1701, which has a certain height, and the material is in bulk, in order to prevent the material from spilling, the width of the trough 12 is smaller than the width of the material trough 1701.

[0038] Preferably, in order to further prevent the scattered materials from spilling, an annular outer protection platform 1702 is formed between the material trough 1701 and the outer side of the kiln bottom 17, and an annular inner protection platform 1703 is formed between the material trough 1701 and the inner side of the kiln bottom 17 to prevent the materials from spilling.

[0039] Optionally, the radiation tube 22 is arranged at the bottom of the kiln cover 21 .

[0040] Optionally, in order to discharge the smoke in the kiln chamber 5 , the outer wall 1301 is provided with an exhaust port 6 communicating with the kiln chamber 5 .

[0041] Preferably, in order to collect the materials pushed out by the spiral discharging shaft 9, a discharging trough 20 is provided below the side of the spiral discharging shaft 9 facing the outer wall 1301, and the materials pushed out by the spiral discharging shaft 9 fall into the discharging trough 20 and are collected and discharged.

[0042] Furthermore, the outer liner 1, the inner liner 2 and the kiln cover 21 of the rotary kiln in the prior art are usually made of refractory materials, such as alumina cement refractory castables, which have a short service life and require frequent repairs and replacements, which not only increases maintenance costs but also affects production efficiency. Therefore, the outer liner 1, the inner liner 2 and the kiln cover 21 of the rotary kiln of the present application are all made of high-temperature refractory materials, such as low-cement castables.

[0043] Furthermore, the kiln bottom of the rotary kiln in the prior art is usually made of slag-resistant casting material, and the material is easily stuck to the wall when heated. For this reason, a protective layer 18 is laid at the bottom of the material trough 1701, and the protective layer 18 is made of corundum casting material.

[0044] Furthermore, the spiral blades of the spiral discharge shaft 9 of the rotary kiln in the prior art are sheet metal welded structures, and the blades are very easy to wear. After a period of use, the spiral rod needs to be removed and repaired by welding. For this reason, wear-resistant ceramic sheets are attached to the outer surface of the spiral blades of the spiral discharge shaft 9 to delay the wear of the blades.

[0045] The above is a relatively specific and detailed description of the present application through general description and specific embodiments. It should be understood that, based on the technical concept of the present application, several conventional adjustments or further innovations can be made to these specific embodiments; however, as long as they do not deviate from the technical concept of the present application, the technical solutions obtained by these conventional adjustments or further innovations also fall within the scope of protection of the claims of the present application.

Claims

1. A rotary kiln, comprising a base (16); an annular kiln body (13) is arranged on the base (16); an outer liner (1) is arranged on the inner side of an outer wall (1301) of the kiln body (13), and an inner liner (2) is arranged on the inner side of an inner wall (1302); a kiln cover (21) is arranged between the top of the outer liner (1) and the top of the inner liner (2); the base (16) is rotatably provided with an annular kiln bottom (17) for sealing the area between the bottom of the outer liner (1) and the bottom of the inner liner (2); a first side wall (3) and a second side wall (4) are respectively arranged between the outer liner (1) and the inner liner (2); the first side wall (3), the second side wall (4), the outer liner (1), the inner liner (2), the kiln cover (21) and the kiln bottom (17) form a kiln chamber (5); the kiln chamber (5) is provided with a radiation tube (22) for heating the material to be heated in the kiln chamber (5); the first side wall (3) is away from the kiln chamber (5) on one side; A gap (7) is formed between the side of the second side wall (4) away from the kiln chamber (5) and the kiln bottom (17); a material inlet is provided at the bottom of the first side wall (3); a material outlet is provided at the bottom of the second side wall (4); the gap (7) in the material inlet area is provided with an oscillating feeder (11) for spreading the material to be heated on the top surface of the kiln bottom (17); the gap (7) in the material outlet area is provided with a spiral discharger for discharging the heated material; the spiral discharger comprises a discharge rack (10) and a spiral discharge motor (8) arranged on the kiln body (13); the discharge rack (10) is rotatably provided with a spiral discharge shaft (9); the output shaft of the spiral discharge motor (8) is connected to the spiral discharge shaft (9) to drive the spiral discharge shaft (9) to rotate; and a kiln bottom driving device is also included for driving the kiln bottom (17) to rotate, characterized in that: The top surface of the kiln bottom (17) is provided with an annular material trough (1701); the bottom surface of the spiral discharging shaft (9) is in contact with the top surface of the material trough (1701).

2. A rotary kiln according to claim 1, characterized in that: The kiln bottom driving device comprises a plurality of supporting wheels (15) uniformly distributed on the base (16); a kiln bottom support frame (14) can be rotatably arranged on the supporting wheels (15); the kiln bottom (17) is placed on the kiln bottom support frame (14); the base (16) is also provided with a kiln bottom motor; the output shaft of the kiln bottom motor is connected to the kiln bottom support frame (14) to drive the kiln bottom support frame (14) to rotate.

3. A rotary kiln according to claim 1, characterized in that: The discharge port of the oscillating feeder (11) is provided with a material trough (12); the bottom of the material trough (12) is located above the material trough (1701); and the width of the material trough (12) is smaller than the width of the material trough (1701).

4. A rotary kiln according to claim 3, characterized in that: An annular outer protection platform (1702) is formed between the material trough (1701) and the outer side of the kiln bottom (17), and an annular inner protection platform (1703) is formed between the material trough (1701) and the inner side of the kiln bottom (17).

5. A rotary kiln according to claim 1, characterized in that: The radiation tube (22) is arranged at the bottom of the kiln cover (21).

6. A rotary kiln according to claim 1, characterized in that: The outer wall (1301) is provided with an exhaust port (6) communicating with the kiln chamber (5).

7. A rotary kiln according to claim 1, characterized in that: The spiral discharging shaft (9) is provided with a discharging trough (20) at a lower side of the outer wall (1301).

8. A rotary hearth kiln according to any one of claims 1 to 7, characterized in that: The outer container (1), the inner container (2) and the kiln cover (21) are all made of high-temperature refractory materials.

9. A rotary hearth kiln according to any one of claims 1 to 7, characterized in that: A protective layer (18) is laid on the bottom of the material trough (1701); the protective layer (18) is made of corundum casting material.

10. A rotary hearth kiln according to any one of claims 1 to 7, characterized in that: The outer surface of the spiral blade of the spiral discharging shaft (9) is pasted with a wear-resistant ceramic sheet.

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