A ceramic cylinder for an externally heated rotary kiln

Abstract

This utility model relates to the field of rotary kiln technology, specifically proposing a ceramic cylinder for an externally heated rotary kiln, comprising multiple tubular ceramic inner liner segments; the multiple ceramic inner liner segments are spliced ​​together to form a ceramic inner liner; a tubular feed ceramic inner liner is spliced ​​to the left side of the ceramic inner liner, and a tubular discharge ceramic inner liner is spliced ​​to the right side; the outer diameter and pipe diameter of the ceramic inner liner segments, the feed ceramic inner liner, and the discharge ceramic inner liner are all the same; a metal outer cylinder is sleeved on the outside of the multiple ceramic inner liner segments, the feed ceramic inner liner, and the discharge ceramic inner liner; the metal outer cylinder is equipped with an inner liner pressing device for pushing the feed ceramic inner liner and the discharge ceramic inner liner towards the ceramic inner liner, pressing the multiple ceramic inner liner segments together. This utility model has the advantages of easy manufacturing, simple maintenance, and significantly reduced production costs.

Description

Technical Field

[0001] This utility model relates to the field of rotary kiln technology, specifically to a ceramic cylinder of an externally heated rotary kiln. Background Technology

[0002] Rotary kilns are widely used in various industrial fields, and their inner liner is typically made of metal. However, when firing powders containing magnetic materials, the metal liner may cause magnetic contamination of the material. To solve this problem, a ceramic liner design is adopted. The ceramic liner effectively avoids the contamination of magnetic materials by the metal liner.

[0003] Currently, rotary kilns with ceramic liners typically employ internal heating, meaning that electric heating elements are installed inside the ceramic liner to rapidly transfer heat into the kiln. This design complicates the manufacturing process. Furthermore, when the heating elements malfunction, repairs become more difficult due to their placement within the ceramic liner. Utility Model Content

[0004] Therefore, this utility model provides a ceramic cylinder for an externally heated rotary kiln, which solves the technical problems of complex manufacturing process and difficult maintenance caused by the internal heating method used in existing ceramic inner liner rotary kilns.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A ceramic cylinder for an externally heated rotary kiln includes multiple tubular ceramic inner liner segments; the multiple ceramic inner liner segments are spliced ​​together to form a ceramic inner liner; a tubular feed ceramic inner liner is spliced ​​to the left side of the ceramic inner liner, and a tubular discharge ceramic inner liner is spliced ​​to the right side; the outer diameter and pipe diameter of the ceramic inner liner segments, the feed ceramic inner liner, and the discharge ceramic inner liner are all the same; a metal outer cylinder is sleeved on the outside of the multiple ceramic inner liner segments, the feed ceramic inner liner, and the discharge ceramic inner liner; the metal outer cylinder is provided with an inner liner pressing device for pushing the feed ceramic inner liner and the discharge ceramic inner liner toward the ceramic inner liner, thereby pressing the multiple ceramic inner liner segments together.

[0007] Optionally, the left side of the feeding ceramic inner liner extends out of the metal outer cylinder to form a feeding end protrusion; the right side of the discharging ceramic inner liner extends out of the metal outer cylinder to form a discharging end protrusion; the outer diameter of the feeding end protrusion is smaller than the outer diameter of the feeding ceramic inner liner; the outer diameter of the discharging end protrusion is smaller than the outer diameter of the discharging ceramic inner liner; the inner liner pressing device includes annular fixing brackets respectively fixedly sleeved on the left and right sides of the outer wall of the metal outer cylinder; the fixing brackets have multiple telescopic cylinders evenly distributed radially along the metal outer cylinder; a spring column is movably provided inside the telescopic cylinder; a spring pressure cover is provided at the top of the telescopic cylinder; a spring seat is provided at the bottom of the spring column, and a telescopic arm is provided at the top; the telescopic arm can movably pass through the spring pressure cover. The cover; a spring is sleeved on the outer wall of the spring column; the spring is limited between the spring cover and the spring seat; a push cylinder is slidably sleeved on the outer walls of both the feed end protrusion and the discharge end protrusion; the diameter of the push cylinder is adapted to the outer diameter of either the feed end protrusion or the discharge end protrusion; the telescopic arm near the feed end protrusion is fixedly connected to the push cylinder of the feed end protrusion; the telescopic arm near the discharge end protrusion is fixedly connected to the push cylinder of the discharge end protrusion; the right side wall of the push cylinder of the feed end protrusion is in contact with the left side wall of the feed ceramic liner; the left side wall of the push cylinder of the discharge end protrusion is in contact with the right side wall of the discharge ceramic liner.

[0008] Preferably, both the push cylinder at the feed end protrusion and the push cylinder at the discharge end protrusion are provided with tubular sealing parts on the side facing the ceramic inner liner; the diameter of the sealing part is adapted to the outer diameter of the metal outer cylinder; the sealing part is slidably sleeved on the outer wall of the metal outer cylinder near the feed ceramic inner liner or near the outer wall of the metal outer cylinder near the discharge ceramic inner liner.

[0009] Preferably, a second sealing ring is provided between the sealing part at the inlet ceramic liner and the outer metal cylinder, and between the sealing part at the outlet ceramic liner and the outer metal cylinder.

[0010] Preferably, a first sealing ring is provided between the pusher cylinder of the feed end protrusion and the feed end protrusion, and between the pusher cylinder of the discharge end protrusion and the discharge end protrusion.

[0011] Preferably, the end of the ceramic inner liner away from the ceramic inner liner is provided with a feed sidewall to seal this end; the feed sidewall is provided with a through feed hole.

[0012] Optionally, the outer wall of the ceramic inner liner section has at least three sets of positioning grooves evenly distributed radially and parallel to its axial direction; the outer wall of the feeding ceramic inner liner has feeding positioning grooves that match the number and position of the positioning grooves; the outer wall of the discharging ceramic inner liner has discharging positioning grooves that match the number and position of the positioning grooves; the outer wall of the metal outer cylinder has multiple through positioning holes along the direction of the positioning grooves; positioning pins are provided in the positioning holes; the bottom of the positioning pins is embedded in the positioning groove, or the feeding positioning groove, or the discharging positioning groove.

[0013] Preferably, at least three sets of second sprockets parallel to their axial direction are evenly distributed along the radial direction of the inner wall of the ceramic inner liner section; the inner wall of the feeding ceramic inner liner is provided with first sprockets that are adapted to the number, position, and shape of the second sprockets; the inner wall of the discharging ceramic inner liner is provided with third sprockets that are adapted to the number, position, and shape of the second sprockets; each set of the first, second, and third sprockets is located on a straight line.

[0014] Preferably, a ceramic baffle ring is provided between the ceramic inner liner segments at least one interval; the diameter of the ceramic baffle ring is the same as the diameter of the ceramic inner liner segment, and its outer diameter is the same as the outer diameter of the ceramic inner liner segment; the inner wall of the ceramic baffle ring is provided with an annular baffle protrusion.

[0015] Preferably, the ceramic baffle ring has annular protrusions on both its left and right sides; the ceramic inner liner sections on both the left and right sides of the ceramic baffle ring have annular embedding grooves that fit the protrusions; the protrusions are embedded in the embedding grooves.

[0016] Optionally, the outer wall of the ceramic baffle ring is provided with baffle positioning grooves that are adapted to the number and position of the positioning grooves; the bottom of the positioning pin is embedded in the baffle positioning groove.

[0017] This utility model has at least the following beneficial effects:

[0018] It comprises multiple ceramic inner liner segments, which are spliced ​​together to form a ceramic inner liner. A feeding ceramic inner liner is spliced ​​to the left side of the ceramic inner liner, and a discharging ceramic inner liner is spliced ​​to the right side. A metal outer cylinder is fitted around the ceramic inner liner, the feeding ceramic inner liner, and the discharging ceramic inner liner. An inner liner pressing device pushes the feeding ceramic inner liner and the discharging ceramic inner liner towards the ceramic inner liner, pressing the multiple ceramic inner liner segments together. In use, the ceramic cylinder of this application passes through a heating box. Because the entire ceramic cylinder consists only of the ceramic inner liner and the outer metal cylinder, the heat from the heating box can be completely conducted into the ceramic cylinder to heat the material, thus achieving external heating of the ceramic cylinder without the need for internal heating. This simplifies production, facilitates maintenance, and greatly reduces production costs.

[0019] Therefore, the ceramic cylinder of the externally heated rotary kiln of this utility model has the advantages of simple structure, easy heat conduction, easy production and processing, and easy maintenance. Attached Figure Description

[0020] To more clearly illustrate the prior art and the present invention, the accompanying drawings used in the description of the prior art and the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other drawings from the provided drawings without any creative effort.

[0021] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which this utility model can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0022] Figure 1 This is a front sectional view of the ceramic cylinder of an externally heated rotary kiln according to the present invention;

[0023] Figure 2 This utility model relates to an externally heated rotary kiln ceramic cylinder. Figure 1 Enlarged view of section A;

[0024] Figure 3 This utility model relates to an externally heated rotary kiln ceramic cylinder. Figure 1 A magnified view of section B;

[0025] Figure 4 This utility model relates to an externally heated rotary kiln ceramic cylinder. Figure 1 A magnified view of section C;

[0026] Figure 5 This is a schematic diagram of the metal outer cylinder structure of the ceramic cylinder of an externally heated rotary kiln according to the present invention;

[0027] Figure 6 This is a schematic diagram of the ceramic inner liner section of the ceramic cylinder of an externally heated rotary kiln according to the present invention.

[0028] Figure 7 This is a schematic diagram of the structure of the feed ceramic liner of the ceramic cylinder of an externally heated rotary kiln according to this utility model;

[0029] Figure 8 This is a schematic diagram of the structure of the discharge ceramic inner liner of the ceramic cylinder of an externally heated rotary kiln according to this utility model;

[0030] Figure 9 This is a schematic diagram of the structure of the ceramic baffle ring of the ceramic cylinder of an externally heated rotary kiln according to the present invention;

[0031] Figure 10 This is a front sectional view of the inner liner pressing device for the ceramic cylinder of an externally heated rotary kiln according to this utility model.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Metal outer cylinder; 101. Positioning hole; 2. Ceramic inner liner section; 201. Embedded groove; 202. Second material-dispersing protrusion; 203. Positioning groove; 3. Feeding ceramic inner liner; 301. Feeding hole; 302. Feeding end protrusion; 303. Feeding positioning groove; 4. Discharge ceramic inner liner; 401. Discharge end protrusion; 402. Discharge positioning groove; 403. Third material-dispersing protrusion; 5. Ceramic retaining ring; 50 1. Boss; 502. Material-blocking boss; 503. Material-blocking positioning groove; 6. Inner liner clamping device; 601. Fixed bracket; 602. Telescopic cylinder; 603. Spring column; 6031. Spring seat; 6032. Telescopic arm; 604. Push cylinder; 6041. Fixed part; 6042. Sealing part; 605. Spring; 606. Spring cover; 7. Positioning pin; 8. First sealing ring; 9. Second sealing ring. Detailed Implementation

[0034] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] In the description of this application: unless otherwise stated, "a plurality of" means two or more. The terms "first," "second," "third," etc., in this application are intended to distinguish the objects referred to and do not have any special meaning in terms of technical connotation (e.g., they should not be construed as an emphasis on importance or order). Expressions such as "including," "comprising," and "having" also mean "not limited to" (certain units, components, materials, steps, etc.).

[0036] The terms used in this application, such as "upper," "lower," "left," "right," and "middle," are generally used to facilitate intuitive understanding by referring to the accompanying drawings, and are not absolute limitations on the positional relationships in the actual product. Changes in these relative positional relationships, without departing from the technical concept disclosed in this application, should also be considered within the scope of this application.

[0037] This utility model discloses a ceramic cylinder for an externally heated rotary kiln, such as... Figures 1 to 10As shown, multiple tubular ceramic inner liner segments 2 are provided, which are spliced ​​together to form a ceramic inner liner. A tubular feed ceramic inner liner 3 is spliced ​​on the left side of the ceramic inner liner, and a tubular discharge ceramic inner liner 4 is spliced ​​on the right side. The outer diameter and pipe diameter of the ceramic inner liner segments 2, feed ceramic inner liner 3, and discharge ceramic inner liner 4 are all the same. A metal outer cylinder 1 is fitted over the multiple ceramic inner liner segments 2, feed ceramic inner liner 3, and discharge ceramic inner liner 4. The metal outer cylinder 1 is easy to conduct heat and can protect the ceramic inner liner segments 2, feed ceramic inner liner 3, and discharge ceramic inner liner 4. To prevent loosening between the ceramic inner liner segments 2, feed ceramic inner liner 3, and discharge ceramic inner liner 4, especially loosening caused by thermal expansion and contraction during heating and cooling of the cylinder, an inner liner pressing device 6 is provided on the metal outer cylinder 1. The inner liner pressing device 6 pushes the feed ceramic inner liner 3 and discharge ceramic inner liner 4 towards the ceramic inner liner, so that the multiple ceramic inner liner segments 2 are tightly pressed together. When in use, the ceramic cylinder of this application is passed through the heating box. Since the entire ceramic cylinder consists only of a ceramic inner liner and an outer metal cylinder 1, the heat from the heating box can be completely conducted into the cylinder to heat the material, thus realizing external heating of the ceramic cylinder without the need for internal heating. This makes production easy, maintenance convenient, and greatly reduces production costs.

[0038] Optionally, this application embodiment provides a preferred structure for the inner liner pressing device 6, specifically: the left side of the feeding ceramic inner liner 3 extends out of the metal outer cylinder 1 to form a feeding end protrusion 302. The right side of the discharging ceramic inner liner 4 extends out of the metal outer cylinder 1 to form a discharging end protrusion 401. The outer diameter of the feeding end protrusion 302 is smaller than the outer diameter of the feeding ceramic inner liner 3. The outer diameter of the discharging end protrusion 401 is smaller than the outer diameter of the discharging ceramic inner liner 4. The inner liner pressing device 6 includes annular fixing brackets 601 respectively fixedly sleeved on the left and right sides of the outer wall of the metal outer cylinder 1. Multiple telescopic cylinders 602 are evenly distributed radially along the metal outer cylinder 1 on the fixing brackets 601. Spring columns 603 are movably provided inside the telescopic cylinders 602. A spring pressure cap 606 is installed on the top of the telescopic cylinder 602. The spring column 603 has a spring seat 6031 at its bottom and a telescopic arm 6032 at its top. The outer diameter of the spring seat 6031 is larger than the outer diameter of the spring column 603, and the outer diameter of the telescopic arm 6032 is smaller than the outer diameter of the spring column 603. The spring cover 606 has a through hole, the diameter of which is adapted to the outer diameter of the telescopic arm 6032, allowing the telescopic arm 6032 to move through the spring cover 606. A spring 605 is fitted onto the outer wall of the spring column 603. The spring 605 is confined between the spring cover 606 and the spring seat 6031. A pusher cylinder 604 can be slidably fitted onto the outer wall of both the feed end protrusion 302 and the discharge end protrusion 401. The diameter of the pusher cylinder 604 is adapted to the outer diameter of either the feed end protrusion 302 or the discharge end protrusion 401. The telescopic arm 6032 near the feed end protrusion 302 is fixedly connected to the push cylinder 604 of the feed end protrusion 302; the telescopic arm 6032 near the discharge end protrusion 401 is fixedly connected to the push cylinder 604 of the discharge end protrusion 401; specifically, they can be connected by providing a fixing part 6041 on the outer wall of the push cylinder 604. The right side wall of the push cylinder 604 of the feed end protrusion 302 is in contact with the left side wall of the feed ceramic inner liner 3; the left side wall of the push cylinder 604 of the discharge end protrusion 401 is in contact with the right side wall of the discharge ceramic inner liner 4. Under the tension of the spring 605, the push cylinder 604 pushes the feed ceramic inner liner 3 or the discharge ceramic inner liner 4, thereby tightly pressing the various sections of the ceramic inner liner 3 together.

[0039] Preferably, to enhance the stability of the pusher cylinder 604 during pushing, both the pusher cylinder 604 at the feed end protrusion 302 and the pusher cylinder 604 at the discharge end protrusion 401 are provided with tubular sealing parts 6042 on the side facing the ceramic inner liner. The diameter of the sealing part 6042 is adapted to the outer diameter of the metal outer cylinder 1, and the sealing part 6042 can be slidably sleeved on the outer wall of the metal outer cylinder 1 near the feed ceramic inner liner 3 or near the discharge ceramic inner liner 4.

[0040] Preferably, for atmosphere kilns, protective gas needs to be injected into the kiln, and the sealing performance of the cylinder is relatively high. In order to seal the cylinder, a second sealing ring 9 is provided between the sealing part 6042 at the feed ceramic inner liner 3 and the metal outer cylinder 1, and between the sealing part 6042 at the discharge ceramic inner liner 4 and the metal outer cylinder 1. The second sealing ring 9 is made of fluororubber material.

[0041] Preferably, in order to further seal the kiln body, a first sealing ring 8 is provided between the pusher cylinder 604 of the feed end protrusion 302 and the feed end protrusion 302, and between the pusher cylinder 604 of the discharge end protrusion 401 and the discharge end protrusion 401. The first sealing ring 8 is made of fluororubber material.

[0042] Preferably, to facilitate feeding, the end of the ceramic inner liner 3 away from the ceramic inner liner is provided with a feeding side wall to close this end, and a through feeding hole 301 is opened in the feeding side wall, through which the feeding rod of the feeder enters the cylinder to feed the material.

[0043] Optionally, for rotary kilns, the kiln body needs to rotate. For this application, the metal outer cylinder 1 and its multiple ceramic inner liner sections 2, feeding ceramic inner liner 3, and discharging ceramic inner liner 4 need to rotate synchronously. Therefore, this application provides a preferred embodiment for their connection: at least three sets of positioning grooves 203 are evenly distributed radially along the outer wall of the ceramic inner liner section 2, parallel to its axial direction; the outer wall of the feeding ceramic inner liner 3 has feeding positioning grooves 303 that match the number and position of the positioning grooves 203; the outer wall of the discharging ceramic inner liner 4 has discharging positioning grooves 402 that match the number and position of the positioning grooves 203. Multiple through positioning holes 101 are formed on the outer wall of the metal outer cylinder 1 along the direction of the positioning grooves 203. Thus, positioning pins 7 are inserted into the positioning holes 101, with the bottom of the positioning pins 7 embedded in the positioning grooves 203, the feeding positioning grooves 303, or the discharging positioning grooves 402. This structure not only allows the metal outer cylinder 1 and its multiple ceramic inner liner sections 2, feeding ceramic inner liner 3, and discharging ceramic inner liner 4 to rotate synchronously, but also allows them to move freely in the axial direction when heated and expanded.

[0044] Preferably, in order to fully agitate the material, at least three sets of second scrambling ridges 202 are evenly distributed radially along the inner wall of the ceramic inner liner section 2, parallel to its axial direction; the inner wall of the feeding ceramic inner liner 3 is provided with first scrambling ridges that match the number, position, and shape of the second scrambling ridges 202; the inner wall of the discharging ceramic inner liner 4 is provided with third scrambling ridges 403 that match the number, position, and shape of the second scrambling ridges 202; each set of first scrambling ridges, second scrambling ridges 202, and third scrambling ridges 403 are located on a straight line, thereby forming scrambling ridges to agitate the material inside the cylinder.

[0045] Preferably, to prevent excessive material movement speed caused by material collapse within the cylinder, which could result in insufficient heating, ceramic baffle rings 5 ​​are provided between at least one section of the ceramic inner liner 2. The diameter of the ceramic baffle ring 5 is the same as that of the ceramic inner liner section 2, and its outer diameter is also the same as that of the ceramic inner liner section 2. The inner wall of the ceramic baffle ring 5 is provided with annular baffle protrusions 502. These baffle protrusions 502 block the material's movement speed, preventing collapse.

[0046] Preferably, the ceramic baffle ring 5 blocks the material. To prevent material from falling out at the joint between the ceramic baffle ring 5 and the ceramic inner liner section 2, annular protrusions 501 are provided on both the left and right sides of the ceramic baffle ring 5. Annular embedding grooves 201 that are adapted to the protrusions 501 are provided on the side of the ceramic inner liner section 2 facing the ceramic baffle ring 5 on both the left and right sides of the ceramic baffle ring 5. The protrusions 501 are embedded in the embedding grooves 201 to improve the sealing between them.

[0047] Optionally, this application provides a preferred embodiment for the connection between the ceramic retaining ring 5 and the metal outer cylinder 1, specifically: the outer wall of the ceramic retaining ring 5 is provided with retaining positioning grooves 503 that are adapted in number and position to the positioning grooves 203. In this way, the connection between the ceramic retaining ring 5 and the metal outer cylinder 1 is achieved by installing positioning pins 7 on the metal outer cylinder 1, so that the bottom of the positioning pins 7 are embedded in the retaining positioning grooves 503.

[0048] The present application has been described in a relatively specific and detailed manner above through general descriptions 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 depart from the technical concept of the present application, the technical solutions obtained by these conventional adjustments or further innovations also fall within the protection scope of the claims of the present application.

Claims

1. A ceramic shell of an externally heated rotary kiln, characterized in that, It includes multiple tubular ceramic inner liner segments (2); multiple ceramic inner liner segments (2) are spliced ​​together to form a ceramic inner liner; a tubular feeding ceramic inner liner (3) is spliced ​​on the left side of the ceramic inner liner, and a tubular discharging ceramic inner liner (4) is spliced ​​on the right side; the outer diameter and pipe diameter of the ceramic inner liner segments (2), feeding ceramic inner liner (3), and discharging ceramic inner liner (4) are all the same; a metal outer cylinder (1) is sleeved on the outside of the multiple ceramic inner liner segments (2), feeding ceramic inner liner (3), and discharging ceramic inner liner (4); the metal outer cylinder (1) is provided with an inner liner pressing device (6) for pushing the feeding ceramic inner liner (3) and discharging ceramic inner liner (4) towards the ceramic inner liner, thereby pressing the multiple ceramic inner liner segments (2) together.

2. A ceramic shell for an externally heated rotary kiln according to claim 1, wherein The feed ceramic inner liner (3) extends out of the metal outer cylinder (1) from the left side to form a feed end protrusion (302); the discharge ceramic inner liner (4) extends out of the metal outer cylinder (1) from the right side to form a discharge end protrusion (401); the outer diameter of the feed end protrusion (302) is smaller than the outer diameter of the feed ceramic inner liner (3); the outer diameter of the discharge end protrusion (401) is smaller than the outer diameter of the discharge ceramic inner liner (4); the inner liner pressing device (6) includes components respectively fixedly sleeved on the left and right sides of the outer wall of the metal outer cylinder (1). The right side has two annular fixing brackets (601); the fixing brackets (601) have multiple telescopic cylinders (602) evenly distributed radially along the outer metal cylinder (1); the telescopic cylinders (602) are movably provided with spring columns (603); the top of the telescopic cylinders (602) is provided with spring caps (606); the bottom of the spring column (603) is provided with a spring seat (6031), and the top is provided with a telescopic arm (6032); the telescopic arm (6032) can move through the spring caps (606); the spring column (603) is movably provided with spring caps (606); the right side has two annular fixing brackets (601); the right side has multiple telescopic cylinders (602) evenly distributed radially along the outer metal cylinder (1); the right side has multiple telescopic cylinders (602); the right side has multiple telescopic cylinders (602); the right side has multiple telescopic cylinders (602); the right side has multiple telescopic cylinders (603 ... 03) A spring (605) is sleeved on the outer wall; the spring (605) is limited between the spring cover (606) and the spring seat (6031); a push cylinder (604) is slidably sleeved on the outer wall of both the feed end protrusion (302) and the discharge end protrusion (401); the diameter of the push cylinder (604) is adapted to the outer diameter of the feed end protrusion (302) or the outer diameter of the discharge end protrusion (401); the telescopic arm (6032) near the feed end protrusion (302) and the The push cylinder (604) of the feed end protrusion (302) is fixedly connected; the telescopic arm (6032) near the discharge end protrusion (401) is fixedly connected to the push cylinder (604) of the discharge end protrusion (401); the right side wall of the push cylinder (604) of the feed end protrusion (302) is in contact with the left side wall of the feed ceramic liner (3); the left side wall of the push cylinder (604) of the discharge end protrusion (401) is in contact with the right side wall of the discharge ceramic liner (4).

3. A ceramic shell for an externally heated rotary kiln according to claim 2, wherein Both the push cylinder (604) of the feed end protrusion (302) and the push cylinder (604) of the discharge end protrusion (401) are provided with tubular sealing parts (6042) on the side facing the ceramic inner liner; the diameter of the sealing part (6042) is adapted to the outer diameter of the metal outer cylinder (1); the sealing part (6042) can be slidably sleeved on the outer wall of the metal outer cylinder (1) near the feed ceramic inner liner (3) or near the outer wall of the metal outer cylinder (1) near the discharge ceramic inner liner (4).

4. The ceramic cylinder of an externally heated rotary kiln according to claim 3, characterized in that, A second sealing ring (9) is provided between the sealing part (6042) at the feed ceramic inner liner (3) and the metal outer cylinder (1), and between the sealing part (6042) at the discharge ceramic inner liner (4) and the metal outer cylinder (1).

5. The ceramic cylinder of an externally heated rotary kiln according to claim 4, characterized in that, A first sealing ring (8) is provided between the pusher cylinder (604) of the feed end protrusion (302) and the feed end protrusion (302), and between the pusher cylinder (604) of the discharge end protrusion (401) and the discharge end protrusion (401).

6. The ceramic cylinder of an externally heated rotary kiln according to claim 1, characterized in that, The feeding ceramic inner liner (3) has a feeding side wall at one end away from the ceramic inner liner to seal this end; the feeding side wall has a through feeding hole (301).

7. The ceramic cylinder of an externally heated rotary kiln according to claim 1, characterized in that, The outer wall of the ceramic inner liner section (2) is evenly distributed with at least three sets of positioning grooves (203) parallel to its axial direction along the radial direction; the outer wall of the feeding ceramic inner liner (3) is provided with feeding positioning grooves (303) that are adapted to the number and position of the positioning grooves (203); the outer wall of the discharging ceramic inner liner (4) is provided with discharging positioning grooves (402) that are adapted to the number and position of the positioning grooves (203); the outer wall of the metal outer cylinder (1) is provided with multiple through positioning holes (101) along the direction of the positioning grooves (203); the positioning holes (101) are provided with positioning pins (7); the bottom of the positioning pins (7) is embedded in the positioning grooves (203), or the feeding positioning grooves (303), or the discharging positioning grooves (402).

8. The ceramic cylinder of an externally heated rotary kiln according to claim 7, characterized in that, The inner wall of the ceramic inner liner section (2) is evenly distributed radially with at least three sets of second material-dispersing protrusions (202) parallel to its axial direction; the inner wall of the feeding ceramic inner liner (3) is provided with first material-dispersing protrusions that are adapted to the number, position and shape of the second material-dispersing protrusions (202); the inner wall of the discharging ceramic inner liner (4) is provided with third material-dispersing protrusions (403) that are adapted to the number, position and shape of the second material-dispersing protrusions (202); each set of first material-dispersing protrusions, second material-dispersing protrusions (202) and third material-dispersing protrusions (403) is located on a straight line.

9. The ceramic cylinder of an externally heated rotary kiln according to claim 8, characterized in that, A ceramic baffle ring (5) is provided between the ceramic inner liner segments (2) that are spaced at least once; the diameter of the ceramic baffle ring (5) is the same as the diameter of the ceramic inner liner segment (2), and its outer diameter is the same as the outer diameter of the ceramic inner liner segment (2); the inner wall of the ceramic baffle ring (5) is provided with an annular baffle protrusion (502).

10. The ceramic cylinder of an externally heated rotary kiln according to claim 9, characterized in that, The ceramic baffle ring (5) has an annular boss (501) on both the left and right sides; the ceramic inner liner section (2) on both the left and right sides of the ceramic baffle ring (5) has an annular embedding groove (201) that matches the boss (501); the boss (501) is embedded in the embedding groove (201).

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