Built-in heating type ceramic rotary kiln

Abstract

The invention relates to a heating built-in ceramic rotary kiln which comprises a support. The bracket is fixedly provided with the feeding device and is rotationally provided with the barrel body; a feeding cover fixedly connected with the bracket is arranged between the feeding device and the cylinder body; a discharging cover fixedly connected with the support is arranged at the end, away from the feeding cover, of the barrel. A discharge hole of the feeding device penetrates through the feeding cover and extends into the barrel body; the support is further provided with a driving device used for driving the barrel to rotate. The cylinder body sequentially comprises an anti-corrosion layer, a ceramic liner, a transition layer, a heat insulation layer and a shell from inside to outside; a plurality of annular electric heating wire holes are evenly distributed in the side wall of the ceramic inner container in the axial direction. An electric heating wire is arranged in the electric heating wire hole and is used for heating materials in the ceramic rotary kiln; a wiring hole communicated with the electric heating wire hole is formed in the side wall of the barrel body; the two ends of the electric heating wire extend into the wiring holes. The device has the advantages of no precipitation of metal foreign matters at high temperature, high heating efficiency, low energy consumption and the like.

Description

Technical Field

[0001] The invention relates to the technical field of rotary kilns, and in particular to a ceramic rotary kiln with built-in heating. Background Art

[0002] Rotary kilns are widely used in many industrial fields. The inner wall of the rotary kiln cylinder is generally a metal wall. When firing powders such as positive and negative electrode materials of lithium batteries, metal foreign matter will precipitate from the metal inner wall at high temperatures, causing pollution to the positive and negative electrode materials and affecting the purity of the positive and negative electrode material powders.

[0003] At the same time, the current rotary kiln heating is generally carried out by setting silicon carbon rods outside the cylinder for heating. This external heating has low thermal efficiency, large heat loss, and energy consumption. Summary of the invention

[0004] To this end, the present invention provides a ceramic rotary kiln with built-in heating, which mainly solves the technical problems of low heating efficiency and energy consumption caused by the metal inner wall of the rotary kiln cylinder at high temperature and the low heating efficiency caused by external heating.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A heating built-in ceramic rotary kiln comprises a bracket; the bracket is fixedly provided with a feeding device and a rotatably provided cylinder; a feeding cover fixedly connected to the bracket is provided between the feeding device and the cylinder; a discharging cover fixedly connected to the bracket is provided at one end of the cylinder away from the feeding cover; the discharging port of the feeding device extends into the cylinder through the feeding cover; the bracket is also provided with a driving device for driving the cylinder to rotate; the cylinder comprises an anti-corrosion layer, a ceramic liner, a transition layer, a heat insulation layer and an outer shell from the inside to the outside; a plurality of annular electric heating wire holes are evenly distributed on the side wall of the ceramic liner along the axial direction; an electric heating wire is provided in the electric heating wire hole for heating the material in the ceramic rotary kiln; a wiring hole connected to the electric heating wire hole is opened on the side wall of the cylinder; both ends of the electric heating wire extend into the wiring hole.

[0007] Furthermore, because the anti-corrosion layer, ceramic liner, transition layer and thermal insulation layer are located at different positions on the cylinder, their temperatures are also different. At the same time, their materials are different and their material expansion rates are also different. This causes inconsistency in their expansion and contraction during thermal expansion. In order to make the expansion and contraction amounts between them adapt to each other, the anti-corrosion layer, ceramic liner, transition layer and thermal insulation layer have adaptable thicknesses to each other, so that the expansion and contraction amounts of the anti-corrosion layer, ceramic liner, transition layer and thermal insulation layer adapt to each other when the temperature of the cylinder changes.

[0008] Furthermore, in order to eliminate the gap at the discharge end formed by thermal expansion and non-contraction during cooling, which affects the discharge of powder, a pushing device is also included; the pushing device includes a fixed flange fixedly connected to the outer shell toward the side of the feed cover; an expansion joint is provided between the fixed flange and the end faces of the anti-corrosion layer, ceramic liner, transition layer and thermal insulation layer; a pushing ring is provided in the expansion joint; a retaining ring is nested in the outer shell toward the side of the discharge cover; the outer diameters of the pushing ring and the retaining ring are both adapted to the inner diameter of the outer shell; the inner diameters of the pushing ring and the retaining ring are both adapted to the inner diameter of the anti-corrosion layer; a plurality of pushing devices are evenly distributed on the fixed flange, which are used to push the pushing ring to squeeze the anti-corrosion layer, ceramic liner, transition layer and thermal insulation layer toward the retaining ring, and make the end faces of the anti-corrosion layer, ceramic liner, transition layer and thermal insulation layer fit with the side faces of the retaining ring.

[0009] Preferably, the fixing flange is evenly distributed with multiple groups of spring devices connected to the pushing ring, which are used to push the side surface of the pushing ring to fit with the end surfaces of the anti-corrosion layer, the ceramic liner, the transition layer and the thermal insulation layer.

[0010] Preferably, the pushing ring is evenly distributed with a plurality of guide rods; the fixing flange is provided with guide holes adapted to the guide rods; and the guide rods can movably pass through the guide holes.

[0011] Optionally, the bracket is provided with a pair of supporting wheels along the radial direction of the cylinder; the cylinder is sleeved with guide wheels; and the guide wheels are placed on the supporting wheels.

[0012] Optionally, a stopper wheel is provided on the side of the guide wheel facing the feed cover; and the wheel wall of the stopper wheel is in contact with the side wall of the guide wheel.

[0013] Furthermore, in order to prevent the wire from being entangled on the rotating cylinder, the cylinder is provided with a wiring device; the wiring device includes a conductive slip ring sleeved on the outer wall of the cylinder and a carbon brush bracket fixedly arranged on the bracket; the carbon brush bracket is provided with a carbon brush; the carbon brush is fitted with the conductive slip ring; the heating wire is electrically connected to the conductive slip ring through the wire.

[0014] Preferably, a junction box is provided on the wiring hole; a bridge is provided on the cylinder; and the wire passes through the junction box and the bridge to be electrically connected to the conductive slip ring.

[0015] Furthermore, since the feed hood and the discharge hood are both static, while the cylinder is a rotating dynamic, in certain scenarios with special protective atmosphere requirements, in order to maintain the stability of the atmosphere in the cylinder, a feed end sealing device is provided between the feed hood and the cylinder; a discharge end sealing device is provided between the discharge hood and the cylinder.

[0016] The present invention has at least the following beneficial effects:

[0017] 1. The cylinder includes an anti-corrosion layer, a ceramic liner, a transition layer, a heat-insulating layer and an outer shell from the inside to the outside. The anti-corrosion layer is made of a material that is resistant to high temperatures and does not precipitate metal at high temperatures. The ceramic liner is made of a material with good thermal conductivity. A plurality of annular electric heating wire holes are evenly distributed on the side wall of the ceramic liner along the axial direction. Electric heating wires are arranged in the electric heating wire holes. Therefore, the ceramic rotary kiln of the present application has high high-temperature stability of the inner wall, no precipitation of metal foreign matter, reduced energy loss, high thermal efficiency, and environmental protection and energy saving.

[0018] 2. The anti-corrosion layer, ceramic liner, transition layer and thermal insulation layer have mutually adapted thicknesses, so that their expansion and contraction amounts are mutually adapted when the temperature of the cylinder changes, avoiding displacement of the wiring holes due to large differences in expansion and contraction amounts, which affects the lead-out of the heating wire.

[0019] 3. Due to the inconsistency of the expansion and contraction of the anti-corrosion layer, ceramic liner, transition layer, thermal insulation layer and outer shell during thermal expansion and contraction, they will shift when the temperature of the cylinder changes. Especially when the cylinder cools down, the shrinkage of the anti-corrosion layer, ceramic liner, transition layer and thermal insulation layer is much greater than that of the outer shell, resulting in the formation of a gap at the discharge end. In order to eliminate the gap at the discharge end caused by the lack of cooling and the impact of discharge, a pushing ring, a retaining ring and a pushing device are provided. One end of the anti-corrosion layer, ceramic liner, transition layer and thermal insulation layer is limited by the retaining ring, and the pushing device pushes the pushing ring so that the other end is compressed and fits together with the retaining ring, thereby avoiding the formation of a gap at the discharge end and not affecting the discharge.

[0020] 4. The setting of the conductive slip ring prevents the wire from being entangled on the rotating cylinder.

[0021] 5. The setting of the sealing device at the feeding end and the sealing device at the discharging end makes the ceramic rotary kiln of the present application have good sealing performance and protects the atmosphere of the cylinder to adapt to the scenes with special protective atmosphere requirements and has a wider range of adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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 embodiments of 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.

[0023] 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.

[0024] Figure 1This is a schematic structural diagram of a ceramic rotary kiln with built-in heating according to the present invention;

[0025] Figure 2 A radial cross-sectional view of a kiln body of a ceramic rotary kiln with built-in heating according to the present invention;

[0026] Figure 3 It is a schematic diagram of a wiring device of a built-in heating ceramic rotary kiln of the present invention;

[0027] Figure 4 It is a partial cross-sectional view of a kiln body on the feed cover side of a ceramic rotary kiln with built-in heating according to the present invention;

[0028] Figure 5 It is a partial cross-sectional view of a kiln body on the discharge cover side of a ceramic rotary kiln with built-in heating according to the present invention;

[0029] Description of reference numerals:

[0030] 1. Bracket; 2. Feed device; 3. Feed cover; 4. Feed end sealing device; 5. Pushing device; 501. Fixed flange; 502. Spring device; 503. Pushing device; 504. Guide rod; 6. Wiring device; 601. Carbon brush bracket; 602. Carbon brush; 603. Conductive slip ring; 604. Bridge; 7. Cylinder; 701. Anti-corrosion layer; 7011. Disturbing beam; 702. Ceramic liner; 7021. Heating wire hole; 703. Transition layer; 704. Insulation layer; 705. Shell; 706. Insulation layer; 707. Wiring hole; 8. Guide wheel; 9. Junction box; 10. Discharge cover; 11. Discharge end sealing device; 12. Stop wheel; 13. Support wheel; 14. Heating wire; 15. Pushing ring; 16. Stop ring. DETAILED DESCRIPTION

[0031] The present application is further described below in detail through specific embodiments in conjunction with the accompanying drawings.

[0032] 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.).

[0033] 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.

[0034] A ceramic rotary kiln with built-in heating according to the present invention, Figures 1 to 5 As shown, the bracket 1 includes a bracket 1, on which a feeding device 2 is fixedly provided and a barrel 7 is rotatably provided. A feeding cover 3 fixedly connected to the bracket 1 is provided between the feeding device 2 and the barrel 7. An end of the barrel 7 away from the feeding cover 3 is provided with a discharging cover 10 fixedly connected to the bracket 1. The discharging port of the feeding device 2 passes through the feeding cover 3 and extends into the barrel 7. The feeding device 2 can select the currently commonly used spiral feeding device, and the spiral feeding rod (discharging port) of the spiral feeding device extends into the barrel 7. The bracket 1 is also provided with a driving device for driving the barrel 7 to rotate. The driving device can select a combination of a motor and a reducer and a passive gear is sleeved on the barrel 7. The reducer is connected to the driving gear, and the driving gear and the passive gear are meshed together. This part of the structure is the existing technology well known to those skilled in the art and will not be described here. In order to prevent the metal foreign matter from precipitating from the inner wall of the cylinder 7 at high temperature, the cylinder 7 is designed to include an anti-corrosion layer 701, a ceramic liner 702, a transition layer 703, a heat-insulating layer 704 and an outer shell 705 from the inside to the outside. The anti-corrosion layer 701 is made of a material that is resistant to high temperatures and does not precipitate metal at high temperatures, for example, the anti-corrosion layer 701 is made of precision corundum ceramics, and the ceramic liner 702 is made of a material with good thermal conductivity, for example, the ceramic liner 702 is made of silicon carbide ceramics. The anti-corrosion layer 701 and the ceramic liner 702 can be bonded together using fire clay, and the transition layer 703 is a castable. The transition layer 703 is castable to the ceramic liner. 702 plays a very good support, the insulation layer 704 is a structural insulation board, which plays a very good role in heat insulation, so that the temperature of the shell 705 is greatly reduced, energy loss is reduced, and it is environmentally friendly and energy-saving. The side wall of the ceramic inner tank 702 is evenly distributed with multiple annular electric heating wire holes 7021 along the axial direction. The electric heating wire hole 7021 is provided with an electric heating wire 14 for heating the material in the ceramic rotary kiln of the present application. The side wall of the cylinder 7 is provided with a wiring hole 707 connected to the electric heating wire hole 7021. Both ends of the electric heating wire 14 extend into the wiring hole 707 to facilitate the connection between the electric heating wire 14 and the wire. In order to enhance the rigidity of the ceramic rotary kiln of the present application, the shell 705 is selected from a steel shell.

[0035] In some application scenarios, in order to further keep warm and reduce heat loss, an insulation layer 706 is provided on the outer wall of the outer shell 705. The setting of the insulation layer 706 can also greatly increase the temperature of the outer shell 705, so that the temperature difference between the outer shell 705 and the ceramic inner liner 702 is reduced, thereby reducing the difference in thermal expansion between them, thereby shortening the expansion joint at the feed end, reducing the relative slip between the outer shell 705 and the insulation layer 704, and avoiding affecting the heating wire 14 in the wiring hole 707.

[0036] At the same time, in some application scenarios, in order to strengthen the tumbling of the powder in the cylinder 7 and make the powder mixing more uniform, the inner wall of the anti-corrosion layer 701 is evenly distributed with a plurality of protruding material disturbing beams 7011 , and the material disturbing beams 7011 extend axially along the cylinder 7 .

[0037] Furthermore, since the anti-corrosion layer 701, the ceramic liner 702, the transition layer 703 and the thermal insulation layer 704 are located at different positions on the cylinder 7, their temperatures are also different. At the same time, the different thermal expansion coefficients brought about by the different materials cause inconsistent expansion and contraction due to temperature changes when the cylinder 7 is heated or cooled. In order to keep the expansion and contraction between them compatible and avoid unevenness between layers, the thickness of the anti-corrosion layer 701, the ceramic liner 702, the transition layer 703 and the thermal insulation layer 704 is adjusted to make their expansion and contraction compatible with each other, because the adjustment of the thickness will affect the temperature of their location, and the temperature will affect their expansion and contraction. By adjusting the thickness of the anti-corrosion layer 701, the ceramic liner 702, the transition layer 703 and the heat insulation layer 704, the anti-corrosion layer 701, the ceramic liner 702, the transition layer 703 and the heat insulation layer 704 have appropriate matching thicknesses. When the temperature of the cylinder changes, the expansion and contraction of the anti-corrosion layer 701, the ceramic liner 702, the transition layer 703 and the heat insulation layer 704 are adapted to each other, so as to avoid displacement of the wiring hole 707 due to too large a difference in expansion and contraction, thereby affecting the lead-out of the heating wire 14.

[0038] Furthermore, when the temperature of the cylinder 7 changes, the anti-corrosion layer 701, the ceramic liner 702, the transition layer 703 and the heat-insulating layer 704 will expand and contract, and shift relative to each other, resulting in a gap at the discharge end. In order to eliminate the gap formed at the discharge end and affect the discharge of the powder, a pushing device 5 is also included. The pushing device 5 includes a fixed flange 501 fixedly connected to the shell 705 on one side of the feed cover 3, and the fixed flange 501 and the anti-corrosion layer 701, the ceramic liner 702, the transition layer 703 and the heat-insulating layer 704 are connected to each other. An expansion joint is arranged between the end faces of the ceramic liner 702, the transition layer 703 and the heat insulation layer 704, and a push ring 15 is arranged in the expansion joint. A retaining ring 16 is nested in the shell 705 on the side of the discharge cover 10. The outer diameters of the push ring 15 and the retaining ring 16 are adapted to the inner diameter of the shell 705, and the inner diameters of the push ring 15 and the retaining ring 16 are adapted to the inner diameter of the anti-corrosion layer 701. When heated and expanded, the anti-corrosion layer 701, the ceramic liner 702, the transition layer 703 and the heat insulation layer 70 4 will expand and move into the expansion joint under the obstruction of the retaining ring 16, and no gap will be generated at the retaining ring 16 to affect the discharge. However, when the temperature of the cylinder 7 drops, the anti-corrosion layer 701, the ceramic liner 702, the transition layer 703, and the thermal insulation layer 704 will shrink. In order to eliminate the gap at the discharge end, the fixed flange 501 is evenly distributed with multiple groups of pushing devices 503, which are used to push the pushing ring 15 to squeeze the anti-corrosion layer 701, the ceramic liner 702, the transition layer 703, and the thermal insulation layer 704 moves toward the retaining ring 16, and makes the end faces of the anti-corrosion layer 701, the ceramic liner 702, the transition layer 703, and the thermal insulation layer 704 fit with the side of the retaining ring 16 to eliminate the gap at the discharge end and avoid affecting the discharge of the powder. The pushing device 503 can be selected from a cylinder, a hydraulic push rod, etc. When the cylinder 7 cools down, the pushing device 503 is started, and as the ceramic liner 702, the transition layer 703, and the thermal insulation layer 704 shrink, they are pressed toward the retaining ring 16.

[0039] Preferably, in order to ensure that the pushing ring 15 always fits the end faces of the anti-corrosion layer 701, the ceramic liner 702, the transition layer 703, and the thermal insulation layer 704, and does not tilt in the expansion joint to affect the feeding, the fixed flange 501 is evenly distributed with multiple groups of spring devices 502 connected to the pushing ring 15, which are used to push the side of the pushing ring 15 to fit the end faces of the anti-corrosion layer 701, the ceramic liner 702, the transition layer 703, and the thermal insulation layer 704. This embodiment provides a preferred structure of the spring device 502, specifically: multiple spring rods are evenly distributed on the side of the pushing ring 15 facing the fixed flange 501; a spring mounting hole adapted to the spring rod is provided on the side of the fixed flange 501 facing the pushing ring 15; a spring is placed in the spring mounting hole, the spring is passed through the spring rod and is limited by the side of the pushing ring 15, and under the tension of the spring, the pushing ring 15 is pressed against the end faces of the anti-corrosion layer 701, the ceramic liner 702, the transition layer 703, and the thermal insulation layer 704.

[0040] Preferably, the pushing ring 15 is evenly distributed with a plurality of guide rods 504 , and the fixing flange 501 is provided with guide holes adapted to the guide rods 504 . The guide rods 504 can movably pass through the guide holes to guide the movement of the pushing ring 15 .

[0041] Optionally, the embodiment of the present application provides a preferred structure for the rotation setting of the cylinder 7, specifically: the bracket 1 is provided with a pair of supporting wheels 13 along the radial direction of the cylinder 7, the cylinder 7 is provided with a guide wheel 8, and the guide wheel 8 is placed on the supporting wheel 13 to realize the rotation of the cylinder 7.

[0042] Optionally, in order to prevent the cylinder 7 from axially moving, a stopper wheel 12 is provided on the side of the guide wheel 8 facing the feed cover 3, and the wheel wall of the stopper wheel 12 is in close contact with the side wall of the guide wheel 8.

[0043] Furthermore, in order to prevent the wire from being entangled on the rotating cylinder 7, the cylinder 7 is provided with a wiring device 6, which includes a conductive slip ring 603 sleeved on the outer wall of the cylinder 7 and a carbon brush bracket 601 fixedly arranged on the bracket 1, and the carbon brush bracket 601 is provided with a carbon brush 602, and the carbon brush 602 is fitted with the conductive slip ring 603, and the heating wire 14 is electrically connected to the conductive slip ring 603 through the wire.

[0044] Preferably, in order to protect the wires, a junction box 9 is provided on the wiring hole 707 , and a bridge 604 is provided on the cylinder 7 . The wires pass through the junction box 9 and the bridge 604 to be electrically connected to the conductive slip ring 603 .

[0045] Furthermore, in order to maintain the stability of the atmosphere in the cylinder, a feed end sealing device 4 is provided between the feed hood 3 and the cylinder 7, and a discharge end sealing device 11 is provided between the discharge hood 10 and the cylinder 7. The present application provides a preferred structure of the feed end sealing device 4 and the discharge end sealing device 11, specifically: the feed end sealing device 4 can be provided with a feed hood sealing flange at the end of the feed hood 3 facing the cylinder 7, and a wear-resistant annular sealing ring is installed thereon, so that the annular sealing ring and the side of the fixed flange 501 fit together, and when the cylinder 7 rotates, the annular sealing ring and the side of the fixed flange 501 rub against each other to play a sealing role; the discharge end sealing device 11 can be provided with a flange at the end of the cylinder 7 facing the discharge hood 10, and an annular sealing ring is also installed thereon, and a flange is also installed at the end of the discharge hood 10 facing the cylinder 7. When the cylinder 7 rotates, the annular sealing ring and the side of the flange rub against each other to play a sealing role.

[0046] 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 heating built-in ceramic rotary kiln, comprising a support (1); the support (1) is fixedly provided with a feeding device (2) and a rotatably provided cylinder (7); a feeding cover (3) fixedly connected to the support (1) is provided between the feeding device (2) and the cylinder (7); an outlet cover (10) fixedly connected to the support (1) is provided at one end of the cylinder (7) away from the feeding cover (3); the outlet of the feeding device (2) passes through the feeding cover (3) and extends into the cylinder (7); the support (1) is also provided with a driving device for driving the cylinder (7) to rotate, characterized in that: The cylinder (7) comprises, from the inside to the outside, an anti-corrosion layer (701), a ceramic inner liner (702), a transition layer (703), a heat insulating layer (704) and an outer shell (705); a plurality of annular electric heating wire holes (7021) are evenly distributed along the axial direction on the side wall of the ceramic inner liner (702); an electric heating wire (14) is arranged in the electric heating wire hole (7021) for heating the material in the ceramic rotary kiln; a wiring hole (707) connected to the electric heating wire hole (7021) is opened on the side wall of the cylinder (7); both ends of the electric heating wire (14) extend into the wiring hole (707).

2. The ceramic rotary kiln with built-in heating according to claim 1, characterized in that: The anti-corrosion layer (701), the ceramic liner (702), the transition layer (703) and the thermal insulation layer (704) have mutually adapted thicknesses, so that when the temperature of the cylinder (7) changes, the expansion and contraction amounts of the anti-corrosion layer (701), the ceramic liner (702), the transition layer (703) and the thermal insulation layer (704) are adapted to each other.

3. The ceramic rotary kiln with built-in heating according to claim 2, characterized in that: The invention also comprises a pushing device (5); the pushing device (5) comprises a fixed flange (501) fixedly connected to the outer shell (705) on the side facing the feed cover (3); an expansion joint is arranged between the fixed flange (501) and the end faces of the anti-corrosion layer (701), the ceramic liner (702), the transition layer (703) and the heat insulation layer (704); a pushing ring (15) is arranged in the expansion joint; a retaining ring (16) is nested in the outer shell (705) on the side facing the discharge cover (10); the outer diameters of the pushing ring (15) and the retaining ring (16) are the same as those of the outer shell (705); 05) inner diameter is adapted; the inner diameters of the push ring (15) and the retaining ring (16) are adapted to the inner diameter of the anti-corrosion layer (701); the fixed flange (501) is evenly distributed with multiple sets of pushing devices (503), which are used to push the push ring (15) to squeeze the anti-corrosion layer (701), the ceramic liner (702), the transition layer (703), and the thermal insulation layer (704) toward the retaining ring (16), and make the end faces of the anti-corrosion layer (701), the ceramic liner (702), the transition layer (703), and the thermal insulation layer (704) fit with the side of the retaining ring (16).

4. The ceramic rotary kiln with built-in heating according to claim 3, characterized in that: The fixing flange (501) is evenly distributed with a plurality of groups of spring devices (502) connected to the pushing ring (15), which are used to push the side of the pushing ring (15) to fit the end faces of the anti-corrosion layer (701), the ceramic liner (702), the transition layer (703), and the heat insulation layer (704).

5. The ceramic rotary kiln with built-in heating according to claim 4, characterized in that: The pushing ring (15) is evenly distributed with a plurality of guide rods (504); the fixing flange (501) is provided with guide holes adapted to the guide rods (504); and the guide rods (504) can movably pass through the guide holes.

6. The ceramic rotary kiln with built-in heating according to claim 1, characterized in that: The support (1) is provided with a pair of supporting wheels (13) along the radial direction of the cylinder (7); the cylinder (7) is sleeved with a guide wheel (8); and the guide wheel (8) is placed on the supporting wheel (13).

7. The ceramic rotary kiln with built-in heating according to claim 6, characterized in that: A stopper wheel (12) is provided on the side of the guide wheel (8) facing the feed cover (3); the wheel wall of the stopper wheel (12) is in close contact with the side wall of the guide wheel (8).

8. The ceramic rotary kiln with built-in heating according to claim 1, characterized in that: The cylinder (7) is provided with a wiring device (6); the wiring device (6) comprises a conductive slip ring (603) sleeved on the outer wall of the cylinder (7) and a carbon brush bracket (601) fixedly arranged on the bracket (1); the carbon brush bracket (601) is provided with a carbon brush (602); the carbon brush (602) and the conductive slip ring (603) are in contact with each other; the heating wire (14) is electrically connected to the conductive slip ring (603) via a wire.

9. The ceramic rotary kiln with built-in heating according to claim 8, characterized in that: The wiring hole (707) is provided with a wiring box (9); the cylinder (7) is provided with a bridge frame (604); the wire passes through the wiring box (9) and the bridge frame (604) to be electrically connected to the conductive slip ring (603).

10. The ceramic rotary kiln with built-in heating according to claim 1, characterized in that: A feeding end sealing device (4) is provided between the feeding cover (3) and the cylinder (7); and a discharging end sealing device (11) is provided between the discharging cover (10) and the cylinder (7).

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