Split type rotary kiln for metallurgical sludge

Abstract

The invention discloses a metallurgical sludge split type rotary kiln, and relates to the technical field of rotary kilns. The kiln heads and the kiln tails are located on the outer sides of the two kiln bodies at the ends respectively, the bases are used for supporting the kiln heads, the kiln bodies and the kiln tails, combustors are arranged on one sides of the kiln heads, and every two adjacent kiln bodies are connected through a connecting and supporting mechanism and fixedly supported on the outer walls of the tops of the bases. A driving mechanism used for driving one kiln body to rotate is arranged on the outer wall of one base. On one hand, the multiple kiln bodies are arranged and are of a split type structure, so that the rotary kiln structure with the large size is convenient to transport and install, meanwhile, the adjacent kiln bodies are connected through the connecting assemblies, reliable sealing between the adjacent kiln bodies can be guaranteed, meanwhile, the halfpace grooves and the halfpace protrusions are arranged to be the halfpace faces, and the sealing performance of the halfpace grooves and the halfpace protrusions is improved. And the three sealing surfaces are arranged, so that the sealing reliability is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rotary kiln, and particularly relates to a metallurgical sludge split rotary kiln. BACKGROUND

[0002] The rotary kiln becomes the preferred technology for treating metallurgical sludge (especially hazardous waste) due to its high-temperature melting capacity, process adjustability, continuous processing, and mature engineering experience. It not only solves the problems of heavy metal stabilization and organic pollution, but also realizes the transformation of waste into treasure. According to the search, the patent with the patent number CN115265176B discloses a waste heat recovery system of a rotary kiln and the rotary kiln, which comprises a bottom plate and two support plates installed on the bottom plate, two rotary kiln bodies are rotationally connected to the two support plates, and the rotary kiln bodies are inclined to one side.

[0003] The above patent has the following disadvantages: the rotary kiln body is designed in an integrated manner, on the one hand, the body structure of the integrated design has a large mass for a large rotary kiln, and hoisting, transportation, installation and the like are not convenient, on the other hand, when local damage of the body cannot be repaired, the whole body needs to be replaced, and the cost is high.

[0004] Therefore, the present application provides a metallurgical sludge split rotary kiln. SUMMARY

[0005] The present application aims at solving the problems in the prior art and provides a metallurgical sludge split rotary kiln.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme: A metallurgical sludge split rotary kiln comprises a plurality of kiln bodies, a kiln head and a kiln tail respectively located on the outer sides of two kiln bodies at the end, and a plurality of bases for supporting the kiln head, the kiln body and the kiln tail, One side of the kiln head is provided with a burner, two adjacent kiln bodies are connected through a connecting support mechanism and are fixed and supported on the top outer wall of the base, the outer wall of one of the bases is provided with a driving mechanism for rotating driving one of the kiln bodies, and the kiln head and the kiln body, and the kiln tail and the kiln body are connected through sealing devices; The connecting support mechanism comprises a connecting assembly for connecting two kiln bodies, a connecting assembly for rolling supporting the connecting assembly, and a base for supporting and fixing the supporting assembly on the top outer wall of the base; The connecting assembly comprises a fixed ring welded to the outer wall of the end of the kiln body and an outer sealing ring matched with the outer wall of the two fixed rings, the inner wall of one of the fixed rings is provided with a ladder groove, and the side wall of the other fixed ring is fixed with a ladder protrusion in sealing contact with the ladder groove.

[0007] Preferably, when the ladder groove is in contact with the ladder convex, the adjacent two kiln bodies and the adjacent fixed ring have a compensation gap.

[0008] Further, the ladder convex is a cavity structure, and the inside of the ladder convex is injected with a thermal expansion medium, and the thermal expansion medium is composed of Bi 50%, Pb 26.7%, Cd 13.3%, and Sn 10%, and has a melting point of 70 degrees Celsius and a thermal expansion coefficient of 35*10 6 / K.

[0009] Based on the foregoing scheme, the outer sealing ring is wrapped around the outer sidewall of the fixed ring, and the opposite inner walls of the two fixed rings are provided with a plurality of blind grooves, and the inner wall of the outer sealing ring is provided with a plurality of through grooves, and each set of matched through grooves and blind grooves is provided with a transmission column.

[0010] In a more preferable scheme in the foregoing scheme, the two outer walls of the outer sealing ring are fixed with a plurality of circularly arrayed rib frames, the sidewall of the fixed ring is fixed with a plurality of groups of arc-shaped elastic steel plates corresponding in number and position to the rib frames, and the outer wall of the rib frame is fixed with a fastening bolt through a bolt, and the end of the fastening bolt is in contact with the arched part of the arc-shaped elastic steel plate.

[0011] As a further scheme of the application, the support assembly is designed in a symmetrical manner in two groups, which comprises a support frame fixed to the top outer wall of the base through a bolt and a support wheel rotatably connected to the inner sidewall of the support frame and in rolling contact with the ladder groove.

[0012] Meanwhile, the two sides of the support wheel are connected with a shaft sleeve through a connecting shaft, the shaft sleeve is rotatably connected to the inner wall of the support frame, the end of the connecting shaft is fixed with an end plate through a bolt, and the end plate is connected to the sidewall of the shaft sleeve through a spring.

[0013] As a preferred scheme of the application, the outer wall of the connecting shaft is provided with a plurality of flat key protrusions, and the connecting shaft and the flat key protrusions are in clearance fit with the inner wall of the shaft sleeve.

[0014] Meanwhile, the driving mechanism comprises an outer frame, a gear ring, and a fixed ring, the outer frame is fixed to the top outer wall of the base, the gear ring is rotatably connected to the inner wall of the outer frame, the fixed ring is fixed to the outer wall of the kiln body, and the fixed ring and the gear ring are in transmission fit through a plurality of transmission steel plates, the bottom inner side of the outer frame is rotatably connected with a worm, the bottom inner wall of the outer frame is rotatably connected with a worm wheel meshing with the worm, and the gear ring is meshed with the outer wall of the worm wheel through the tooth groove of the outer wall thereof.

[0015] As a more preferable scheme of the application, the sidewall of the fixed ring is provided with a transmission groove matched with the end of the transmission steel plate, and the inner wall of the gear ring is provided with an insertion slot in clearance fit with the transmission steel plate. The slot is an open structure at one end and a closed structure at the other end, and the tooth ring is located at the open end of the slot and is fixed with a sealing plate for sealing the transmission steel plate by bolts.

[0016] The beneficial effects of the present application are: 1. In one aspect of the present application, the kiln body is divided into multiple parts, which is a split structure, so that for a rotary kiln structure with a large volume, transportation and installation are facilitated, and adjacent kiln bodies are connected through the connection assembly, which can ensure reliable sealing between adjacent kiln bodies, and the ladder groove and the ladder protrusion are arranged as a ladder surface with three sealing surfaces, increasing the reliability of the seal.

[0017] 2. In the present application, the thermal expansion medium is hollow, and its composition is designed specifically, taking advantage of its melting point and thermal expansion characteristics, so that in the use state, the thermal expansion medium changes from solid to liquid, its volume increases, and it exerts an outward expansion force on the ladder protrusion, causing the ladder protrusion to deform slightly outward, making it fit more tightly with the ladder groove and providing better sealing effect, and in the non-use state, the thermal expansion medium becomes solid, its volume decreases, reducing the internal stress of the ladder protrusion and the contact pressure between the ladder protrusion and the ladder groove, preventing fatigue damage and increasing the service life.

[0018] 3. In the present application, based on the split structure of the kiln body, the outer sealing ring and the fixed ring are arranged in a sleeve structure, which can be further disassembled and installed, and by arranging the through slot, the transmission column and the blind slot, the two fixed rings can be rotated synchronously with the outer sealing ring as the medium, preventing the transmission of torque by the friction between the ladder groove and the ladder protrusion, and preventing friction loss caused by the large static friction between the ladder groove and the ladder protrusion, thus ensuring the sealing effect.

[0019] 4. In the present application, by arranging the fastening bolt and the arc-shaped elastic steel plate, the outer sealing ring and the fixed ring can be axially limited, and the arc-shaped elastic steel plate will store elastic potential energy due to elastic deformation under the action of force, and in combination with the ladder type structure of the ladder groove and the ladder protrusion, the elastic potential energy stored in the arc-shaped elastic steel plate can be used for axial compensation even if the ladder groove and the ladder protrusion are worn, thus ensuring the sealing effect.

[0020] 5. In the present application, by arranging the support assembly, the support wheel can be axially displaced while supporting the outer sealing ring radially, thus ensuring a certain degree of axial movement freedom of the kiln body, thus ensuring reliable implementation of the sealing compensation movement, and increasing the sealing reliability.

[0021] 6. The present application, on the basis of setting the split kiln body, sets the entire driving mechanism as split, so that the entire driving mechanism is detachable connection with the kiln body except the fixed ring, compared with the traditional welded transmission, on the one hand, has a certain transmission buffer gap, on the other hand, is more convenient to disassemble and assemble. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The overall structure of a metallurgical sludge split rotary kiln is provided for the present application; Figure 2 The connection support mechanism structure of a metallurgical sludge split rotary kiln is provided for the present application; Figure 3 The connection assembly partial sectional view structure of a metallurgical sludge split rotary kiln is provided for the present application; Figure 4 The fixed ring and outer sealing ring cooperation structure of a metallurgical sludge split rotary kiln is provided for the present application; Figure 5 The fixed ring and outer sealing ring cooperation sectional view structure of a metallurgical sludge split rotary kiln is provided for the present application; Figure 6 The fixed ring and outer sealing ring cooperation limiting and fixing structure of a metallurgical sludge split rotary kiln is provided for the present application; Figure 7 The support assembly structure of a metallurgical sludge split rotary kiln is provided for the present application; Figure 8 The support assembly structure of a metallurgical sludge split rotary kiln is provided for the present application; Figure 7 The enlarged structure of part A of the present application; Figure 9 The driving mechanism structure of a metallurgical sludge split rotary kiln is provided for the present application; Figure 10 The driving mechanism sectional view structure of a metallurgical sludge split rotary kiln is provided for the present application; Figure 11 The sealing plate structure of a metallurgical sludge split rotary kiln is provided for the present application.

[0023] In the diagram: 1. Base; 2. Burner; 3. Kiln head; 4. Drive mechanism; 5. Connecting support mechanism; 6. Kiln body; 7. Sealing device; 8. Kiln tail; 9. Base; 10. Support assembly; 11. Connecting assembly; 12. Thermal expansion medium; 13. Fixing ring; 14. Ladder groove; 15. Ladder protrusion; 16. Outer sealing ring; 17. Through groove; 18. Transmission column; 19. Blind groove; 20. Fastening bolt; 21. Arc-shaped elastic steel plate; 22. Support wheel; 23. Support frame; 24. Spring; 25. Connecting shaft; 26. End plate; 27. Bushing; 28. Flat key protrusion; 29. ​​Outer frame; 30. Transmission steel plate; 31. Slot; 32. Transmission groove; 33. Gear ring; 34. Motor; 35. Worm; 36. Worm wheel; 37. Gear groove; 38. Sealing plate; 39. Fixing ring; 40. Rib. Detailed Implementation

[0024] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0025] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0026] Example 1:

[0027] A type of metallurgical sludge split rotary kiln, such as Figures 1-11 As shown, the system includes multiple kiln bodies 6, kiln heads 3 and kiln tails 8 located on the outer sides of two kiln bodies 6 at their ends, and multiple bases 1 for supporting the kiln heads 3, kiln bodies 6, and kiln tails 8. A burner 2 is provided on one side of the kiln head 3. Two adjacent kiln bodies 6 are connected by a connecting support mechanism 5 and supported and fixed to the top outer wall of the base 1. One of the bases 1 has a drive mechanism 4 on its outer wall for rotating one of the kiln bodies 6. The kiln head 3 and the kiln body 6, and the kiln tail 8 and the kiln body 6 are connected by a sealing device 7. In this embodiment, since the sealing device 7 is prior art, for example, it has been disclosed in patent publication number CN119043004B, this embodiment has not made any inventive effort on it, so it will not be described in detail.

[0028] The connecting support mechanism 5 includes a connecting component 11 for connecting the two kiln bodies 6, a connecting component 11 for rolling support of the connecting component 11, and a base 9 for supporting and fixing the support component 10 to the top outer wall of the base 1.

[0029] The connecting assembly 11 comprises a fixed ring 13 welded to the outer wall of the end of the kiln body 6, and an outer sealing ring 16 matched to the outer wall of the two fixed rings 13, wherein the inner wall of one of the fixed rings 13 is provided with a ladder groove 14, and the side wall of the other fixed ring 13 is fixed with a ladder protrusion 15 in sealing contact with the ladder groove 14.

[0030] When the ladder groove 14 and the ladder protrusion 15 are in contact and cooperation, there is a compensation gap between the adjacent two kiln bodies 6 and the adjacent fixed rings 13.

[0031] The ladder protrusion 15 is a hollow structure, and the inside of the ladder protrusion 15 is injected with a thermal expansion medium 12, which is a metal or alloy with a high thermal expansion coefficient and a melting point below the working temperature of the entire rotary kiln.

[0032] The thermal expansion medium 12 is composed of Bi 50%, Pb 26.7%, Cd 13.3%, and Sn 10%, and has a melting point of 70 degrees Celsius and a thermal expansion coefficient α = 35 × 10 6 / K.

[0033] The device limits the filling form of the thermal expansion medium 12 into the inner cavity of the ladder protrusion 15, which comprises the following steps: S1: First, a filling port is formed on one side of the ladder protrusion 15, and a filling valve is installed, which is embedded and does not affect the cooperation surface of the ladder groove 14 and the ladder protrusion 15; S2: Then melt the thermal expansion medium 12 through the filling valve into the inner cavity of the ladder protrusion 15, and stop when the total volume of the inner cavity of the ladder protrusion 15 reaches 90%-95%; S3: Wait for the thermal expansion medium 12 to cool and solidify, and then continue to supplement the thermal expansion medium 12 until it fills the entire inner cavity of the ladder protrusion 15.

[0034] This step can ensure that the thermal expansion medium 12 in the inner cavity of the ladder protrusion 15 becomes liquid, which can exert sufficient external expansion force on the ladder protrusion 15.

[0035] The device, on the one hand, sets the kiln body 6 as a plurality of components, which is a split structure, so that the rotary kiln structure with a large volume is convenient for transportation and installation, and the adjacent kiln bodies 6 are connected through the connecting assembly 11, which can ensure reliable sealing between the adjacent kiln bodies 6, and the ladder groove 14 and the ladder protrusion 15 are set as ladder surfaces, which have three sealing surfaces, increasing the reliability of the sealing.

[0036] In addition, the device sets the thermal expansion medium 12 as hollow, and designs the composition of the thermal expansion medium 12, and uses the characteristics of the melting point and thermal expansion, so that the thermal expansion medium 12 changes from solid to liquid in the use state, and the volume increases, which generates an external expansion force on the ladder platform protrusion 15, so that the ladder platform protrusion 15 slightly deforms outward, and the fitting force between the ladder platform protrusion 15 and the ladder platform groove 14 is greater, and the sealing effect is better. In the non-use state, the thermal expansion medium 12 changes to solid, the volume decreases, the internal stress of the ladder platform protrusion 15 and the contact pressure between the ladder platform protrusion 15 and the ladder platform groove 14 are reduced, fatigue damage is prevented, and the service life is increased.

[0037] As shown in Figure 4 , Figure 5 , the outer sealing ring 16 is wrapped around the outer wall of the fixed ring 13, and the inner wall of the opposite side of the two fixed rings 13 is provided with a plurality of blind grooves 19, and the inner wall of the outer sealing ring 16 is provided with a plurality of through grooves 17. Each set of matched through grooves 17 and blind grooves 19 are provided with a transmission column 18.

[0038] The device sets the outer sealing ring 16 and the fixed ring 13 as a sleeved structure based on the split structure of the kiln body 6, which can be further disassembled and installed. Through the through grooves 17, the transmission column 18 and the blind grooves 19, the outer sealing ring 16 can be used as a medium to make the two fixed rings 13 rotate synchronously, so as to prevent the transmission torque from being transmitted by the friction force between the ladder platform groove 14 and the ladder platform protrusion 15, and prevent the friction loss caused by the large static friction force between the ladder platform groove 14 and the ladder platform protrusion 15, and ensure the sealing effect.

[0039] As shown in Figure 6 , the outer wall of the outer sealing ring 16 is fixed with a plurality of circular array rib frames 40, the side wall of the fixed ring 13 is fixed with a plurality of arc-shaped elastic steel plates 21 corresponding to the number and position of the rib frames 40, and the outer wall of the rib frame 40 is fixed with a fastening bolt 20 through a bolt, and the end of the fastening bolt 20 is in contact with the arch part of the arc-shaped elastic steel plate 21.

[0040] The device sets the fastening bolt 20 and the arc-shaped elastic steel plate 21, which can axially limit the outer sealing ring 16 and the fixed ring 13 on one hand, and on the other hand, the arc-shaped elastic steel plate 21 will be elastically deformed and store elastic potential energy under the action of force. Combined with the ladder platform structure of the ladder platform groove 14 and the ladder platform protrusion 15, the elastic potential energy stored in the arc-shaped elastic steel plate 21 can be used for axial compensation when the ladder platform groove 14 and the ladder platform protrusion 15 are worn, so as to ensure the sealing effect.

[0041] In order to solve the support problem; as Figure 7 , 8As shown, the support assembly 10 is designed in two symmetrical groups, which comprises a support frame 23 fixed on the top outer wall of the base 9 by bolts and a support wheel 22 rotatably connected to the inner wall of the support frame 23 and in rolling contact with the ladder groove 14.

[0042] The two sides of the support wheel 22 are connected with a shaft sleeve 27 through a connecting shaft 25, the shaft sleeve 27 is rotatably connected to the inner wall of the support frame 23, and the end of the connecting shaft 25 is fixed with an end plate 26 by bolts, and the end plate 26 is connected to the side wall of the shaft sleeve 27 through a spring 24.

[0043] The outer wall of the connecting shaft 25 is provided with a plurality of flat key protrusions 28, and the connecting shaft 25 and the flat key protrusions 28 are clearance fitted in the inner wall of the shaft sleeve 27.

[0044] Because of the setting of the ladder groove 14 and the ladder protrusion 15 and the fastening bolt 20 and the arc-shaped elastic steel plate 21, when the sealing is worn out and needs to be guaranteed, the entire kiln body 6 needs to have a certain axial movement, so at this time one end of the entire rotary kiln needs to be fixed and the other end needs to be set as movable, and the embodiment preferably takes the kiln tail 8 with relatively simple structure as the movable end, which can be connected to the base 1 through rail sliding, and because the kiln body 6 also needs the freedom of axial displacement, so: The device sets the support assembly 10, wherein the support wheel 22 can have axial displacement under the condition of rolling support of the outer sealing ring 16, so that the radial support can guarantee a certain axial movement freedom of the kiln body 6, thereby guaranteeing the reliable realization of the movement of sealing compensation and increasing the sealing reliability.

[0045] In use, the embodiment first needs to be assembled, because the kiln head 3 is fixed and the kiln tail 8 is movable, so the entire rotary kiln needs to be assembled from the kiln head 3 to the kiln tail 8, and the steps are as follows: first, the kiln head 3 is positioned and fixed, then one of the kiln bodies 6 is connected with the kiln head 3 through the sealing device 7, then the other kiln body 6 is hoisted, so that the two kiln bodies 6 are matched with the ladder groove 14 and the fixed ring 13, the blind groove 19 is rotated and aligned, then the transmission column 18 is put in, then the outer sealing ring 16 is sleeved on the outer wall of the two fixed rings 13, then the fastening bolt 20 is screwed into the rib frame 40 and gradually tightened, so that the arc-shaped elastic steel plate 21 has a certain deformation, and the two kiln bodies 6 are assembled, then the assembly is continued until the required number of kiln bodies 6 is reached, then the kiln bodies 6 are connected with the kiln tail 8 through the sealing device 7, and the axial distance compensation is realized through the rail of the kiln tail 8.

[0046] Embodiment two:

[0047] A metallurgical sludge split type rotary kiln, like Figures 1-11As shown, in order to solve the driving problem, the embodiment is improved on the basis of embodiment 1: in the embodiment, the installation position of the driving mechanism 4 is not limited, but since in addition to the kiln body 6 connected with the kiln head 3, the kiln body 6 needs to have the freedom of axial compensation, therefore, the driving mechanism 4 is arranged at the kiln body 6 connected with the kiln head 3, and specifically: The driving mechanism 4 comprises an outer frame 29, a gear ring 33 and a fixed ring 39, the outer frame 29 is fixed to the top outer wall of the base 1, the gear ring 33 is rotationally connected to the inner wall of the outer frame 29, the fixed ring 39 is fixed to the outer wall of the kiln body 6, and the fixed ring 39 is in transmission cooperation with the gear ring 33 through a plurality of transmission steel plates 30, the bottom inner side of the outer frame 29 is rotationally connected with a worm 35, the bottom inner wall of the outer frame 29 is rotationally connected with a worm wheel 36 engaged with the worm 35, and the gear ring 33 is engaged with the outer wall of the worm wheel 36 through the tooth groove 37 of the outer wall thereof.

[0048] The side wall of the fixed ring 39 is provided with a transmission groove 32 matched with the end of the transmission steel plate 30, and the inner wall of the gear ring 33 is provided with an insertion groove 31 matched with the transmission steel plate 30 in a gap.

[0049] The insertion groove 31 is of a structure that one end is open and the other end is closed, and the opening end of the gear ring 33 is fixed with a sealing plate 38 for sealing the transmission steel plate 30 through a bolt.

[0050] In the embodiment, during assembly, the transmission steel plate 30 can be inserted into the insertion groove 31 and the transmission groove 32, the transmission cooperation of the gear ring 33 and the fixed ring 39 is completed, and the sealing plate 38 is installed to prevent the transmission steel plate 30 from being displaced and falling off from the opening of the insertion groove 31, and during use, when the motor 34 is started, it can drive the worm 35 to rotate, thereby driving the gear ring 33 to rotate through the worm wheel 36, and driving the fixed ring 39 to rotate through the transmission steel plate 30, and finally driving the plurality of kiln bodies 6 to rotate synchronously.

[0051] The device is of a split type, and the entire driving mechanism 4 is also of a split type, so that the entire driving mechanism 4 is detachably connected with the kiln body 6 except the fixed ring 39, which has a certain transmission buffer gap and is more convenient to disassemble and assemble compared with the traditional welded transmission.

[0052] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can make equivalent replacement or change within the technical range disclosed by the present application according to the technical solution and the inventive concept of the present application, which should be covered within the protection scope of the present application.

Claims

1. A metallurgical sludge split rotary kiln, comprising multiple kiln bodies (6), a kiln head (3) and a kiln tail (8) located on the outer sides of two kiln bodies (6) at their ends, and multiple bases (1) for supporting the kiln head (3), kiln bodies (6), and kiln tail (8), characterized in that, A burner (2) is provided on one side of the kiln head (3). Two adjacent kiln bodies (6) are connected by a connecting support mechanism (5) and supported and fixed to the top outer wall of the base (1). One of the bases (1) has a drive mechanism (4) for rotating one of the kiln bodies (6). The kiln head (3) and the kiln body (6), and the kiln tail (8) and the kiln body (6) are connected by a sealing device (7). The connecting support mechanism (5) includes a connecting component (11) for connecting the two kiln bodies (6), a connecting component (11) for rolling support of the connecting component (11), and a base (9) for supporting and fixing the support component (10) to the top outer wall of the base (1). The connecting assembly (11) includes a fixing ring (13) welded to the outer wall of the end of the kiln body (6) and an outer sealing ring (16) that fits into the outer wall of the two fixing rings (13). One of the fixing rings (13) has a stepped groove (14) on its inner wall, and the other fixing ring (13) has a stepped protrusion (15) that contacts and seals with the stepped groove (14) on its side wall.

2. The metallurgical sludge split-type rotary kiln according to claim 1, characterized in that, When the ladder groove (14) and the ladder protrusion (15) are in contact, there is a compensation gap between the two adjacent kiln bodies (6) and the adjacent fixed ring (13).

3. The metallurgical sludge split-type rotary kiln according to claim 1, characterized in that, The stepped protrusion (15) is a hollow structure, and the interior of the stepped protrusion (15) is filled with a thermal expansion medium (12). The composition of the thermal expansion medium (12) is: Bi 50%, Pb 26.7%, Cd 13.3%, Sn 10%, with a melting point of 70 degrees Celsius and a thermal expansion coefficient α = 35 × 10⁻⁶. 6 / K.

4. The metallurgical sludge split-type rotary kiln according to claim 1, characterized in that, The outer sealing ring (16) is wrapped around the outer wall of the fixed ring (13), and multiple blind grooves (19) are opened on the inner wall of the opposite side of the two fixed rings (13). Multiple through grooves (17) are opened on the inner wall of the outer sealing ring (16), and a transmission column (18) is provided in each set of matching through grooves (17) and blind grooves (19).

5. A metallurgical sludge split-type rotary kiln according to claim 1, characterized in that, The outer walls of the outer sealing ring (16) are fixed with multiple ribs (40) arranged in a circular array. The side wall of the fixing ring (13) is fixed with multiple sets of arc-shaped elastic steel plates (21) that correspond to the number and position of the ribs (40). The outer wall of one side of the rib (40) is fixed with fastening bolts (20), and the end of the fastening bolts (20) contacts and fits into the arched part of the arc-shaped elastic steel plate (21).

6. A metallurgical sludge split-type rotary kiln according to claim 1, characterized in that, The support assembly (10) has two sets of symmetrical designs, including a support frame (23) that is fixed to the top outer wall of the base (9) by bolts and a support wheel (22) that is rotatably connected to the inner side wall of the support frame (23) and rolls into contact with the ladder groove (14).

7. A metallurgical sludge split-type rotary kiln according to claim 6, characterized in that, Both sides of the support wheel (22) are connected to bushings (27) via connecting shafts (25). The bushings (27) are rotatably connected to the inner wall of the support frame (23). The end of the connecting shaft (25) is fixed with an end plate (26) by bolts. The end plate (26) is connected to the side wall of the bushing (27) by springs (24).

8. A metallurgical sludge split-type rotary kiln according to claim 7, characterized in that, The outer wall of the connecting shaft (25) is provided with a plurality of flat key protrusions (28), and the connecting shaft (25) and the flat key protrusions (28) are fitted with the inner wall of the bushing (27) with clearance.

9. A metallurgical sludge split-type rotary kiln according to claim 1, characterized in that, The drive mechanism (4) includes an outer frame (29), a toothed ring (33) and a fixed ring (39). The outer frame (29) is fixed to the top outer wall of the base (1). The toothed ring (33) is rotatably connected to the inner wall of the outer frame (29). The fixed ring (39) is fixed to the outer wall of the kiln body (6). The fixed ring (39) and the toothed ring (33) are connected by multiple transmission steel plates (30). The bottom inner side of the outer frame (29) is rotatably connected to a worm (35). The bottom inner wall of the outer frame (29) is rotatably connected to a worm wheel (36) that meshes with the worm (35). The toothed ring (33) meshes with the outer wall of the worm wheel (36) through the tooth groove (37) on its outer wall.

10. A metallurgical sludge split-type rotary kiln according to claim 9, characterized in that, The side wall of the fixed ring (39) is provided with a transmission groove (32) that mates with the end of the transmission steel plate (30), and the inner wall of the toothed ring (33) is provided with a slot (31) that mates with the transmission steel plate (30) with a clearance. The slot (31) is a structure with one end open and the other end closed, and the toothed ring (33) is located at the open end of the slot (31) and is fixed with a sealing plate (38) for blocking the transmission steel plate (30) by bolts.

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