Sealing cover of rotary furnace

Abstract

The invention relates to the technical field of rotary furnaces, in particular to a rotary furnace sealing cover which comprises a feeder, a spiral feeding bin arranged at the output end of the feeder and a movable sealing assembly arranged on the periphery of the spiral feeding bin. A sealing cover is arranged between the spiral feeding bin and the feeder, a middle partition plate is arranged in the sealing cover, a short pipe is arranged between the spiral feeding bin and the sealing cover, and the short pipe is used for communicating the spiral feeding bin with the sealing cover; the sealing cover is divided into two parts through the middle partition plate, and a gap exists between the middle partition plate and the outer pipe wall of the short pipe. A U-shaped ring assembly and a connecting pipe assembly communicated with the U-shaped ring assembly are arranged on the side edge of the movable sealing assembly. An ash outlet is formed in the bottom end of the connecting pipe assembly, and the U-shaped ring assembly is communicated with the sealing cover. In the material diffusion path, the materials are continuously blocked and decelerated, so that the materials cannot enter the dynamic seal, and the blocking phenomenon of the dynamic seal is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of rotary kilns, in particular to a sealing cover of a rotary kiln. Background Art

[0002] A rotary kiln is a thermal equipment for calcining, roasting or drying granular and powdered materials, and is mainly used for primary rough processing of powdered materials or mineral materials. In the prior art, when air needs to be introduced into the rotary kiln, such as when roasting yellow tungsten, the operator usually opens the sight hole on the discharge cover. However, when the sight hole is opened, due to the high temperature inside the rotary kiln, air outside the furnace body is added to form an airflow, which causes dust to appear in the rotary kiln tube, and even materials enter the dynamic seal of the rotary kiln, causing the dynamic seal to get stuck.

[0003] A Chinese patent (authorization announcement number: CN106123579B) discloses a sealing cover of a rotary kiln, which adopts a double-chamber structure. The sealed double chamber includes an intermediate chamber and a sealing chamber. The dynamic seal is installed at the inlet end of the rotary cylinder. The front end of the intermediate chamber is connected to the dynamic seal, and the rear end of the intermediate chamber is connected to the sealing chamber. A closable exhaust port is provided on the intermediate chamber, and the sealing chamber is provided at the outlet end of the rotary cylinder for closing the outlet of the rotary cylinder. At the same time, a cover sealing ring is provided between the sealing chamber and the intermediate chamber.

[0004] However, the patent also has certain technical defects. When the rotary kiln adopts dry dust collection, the material is prone to spitting out at the furnace head because the material moves slowly at the furnace head. At this time, a large amount of dust flows out from the furnace head and easily accumulates on the upper part of the furnace tube. As the furnace tube rotates, the dust gradually flows to the dynamic seal and penetrates into the gap of the labyrinth seal, causing the dynamic seal to get stuck. Summary of the invention

[0005] The object of the present invention is to provide a sealing cover for a rotary kiln to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: A sealing cover of a rotary kiln comprises a feeder, a spiral feed bin arranged at the output end of the feeder, and a dynamic sealing component arranged at the periphery of the spiral feed bin; A sealing cover is provided between the spiral feed bin and the feeder, and a middle partition is built in the sealing cover. A short tube is provided between the spiral feed bin and the sealing cover, and the short tube is installed between the middle partition and the spiral feed bin and is used to connect the spiral feed bin and the sealing cover; the middle partition divides the sealing cover into two parts, and there is a gap between the middle partition and the outer tube wall of the short tube; The side edges of the dynamic sealing assembly are respectively provided with a U-shaped ring assembly and a connecting pipe assembly connected to the U-shaped ring assembly; the bottom end of the connecting pipe assembly is provided with an ash outlet, and the U-shaped ring assembly is connected to the sealing cover.

[0007] As a further solution of the present invention: the sealing cover is divided into a main sealing chamber and a secondary sealing chamber by a middle partition, the top of the main sealing chamber is provided with a closed opening, and a closed cover installed on the closed opening; the bottom of the sealing cover is provided with a collecting hopper cavity, an ash discharge port arranged at the bottom of the collecting hopper cavity, and an ash discharge opening and closing plate installed at the ash discharge port.

[0008] As a further solution of the present invention: the sealing cover is of a circular structure, the middle partition is correspondingly designed as an annular structure and is installed on the periphery of the short tube, and there is a drop gap between the middle partition and the inner wall of the collecting hopper cavity.

[0009] As a further solution of the present invention: an outer fixing plate is arranged on the periphery of the barrel of the feeder, a connecting hoop is arranged at the sealing cover, the connecting hoop is fitted to the outer wall of the barrel of the feeder, an annular protrusion is arranged on the outer surface of the connecting hoop, the annular protrusion is fitted to the outer fixing plate and is fixed by a plurality of peripheral bolts.

[0010] As a further solution of the present invention: the spiral feeding bin is provided with a feeding space and a spiral blade arranged in the feeding space, the spiral blade is installed on the inner wall of the spiral feeding bin and takes the cylinder of the feeder as the axis, a diffusion port is arranged between the spiral feeding bin and the short tube, and the main sealing bin, the short tube, the diffusion port and the feeding space are connected in sequence.

[0011] As a further solution of the present invention: a primary gap is provided between the upper edge area of ​​the sealing cover and the short tube, and the primary sealing chamber and the secondary sealing chamber are connected via the primary gap.

[0012] As a further solution of the present invention: the outer edge of the spiral feed bin is provided with an outer support frame for supporting the U-shaped ring assembly, the pipe assembly and the dynamic seal assembly, the U-shaped ring assembly includes an outer closing hoop installed between the sealing cover and the outer support frame, an inner blocking hoop arranged on the outer surface of the spiral feed bin, and an annular support frame arranged on the inner edge of the outer support frame; the outer closing hoop includes a first combined hoop plate fixed on the cover wall of the sealing cover and a second combined hoop plate fixed on the outer support frame, and the first combined hoop plate and the second combined hoop plate are fixed and installed by bolts; the inner blocking hoop includes a base hoop plate installed on the outer wall of the spiral feed bin, and a blocking hoop member fixed to the base hoop plate by bolts; a first diffuser channel is formed between the outer closing hoop and the inner blocking hoop, a secondary gap opening is arranged between the outer wall of the sealing cover and the first diffuser channel, and the secondary sealing bin is connected to the first diffuser channel through the secondary gap opening.

[0013] As a further solution of the present invention: a front blocking ring sheet and a rear blocking ring sheet are respectively arranged on both sides of the blocking hoop, the front blocking ring sheet is arranged on the outer side of the side of the first-level gap opening, a third-level gap opening is formed between the rear blocking ring sheet and the second combined hoop plate, and a second diffusion channel is formed between the rear blocking ring sheet and the annular support frame; the connecting pipe assembly includes a built-in annular baffle plate arranged at the bottom of the annular support frame, and a connecting pipe channel formed between the built-in annular baffle plate and the outer wall of the spiral feed bin, and the connecting pipe channel is connected to the second diffusion channel.

[0014] As a further solution of the present invention: the ash outlet is arranged at the bottom of the built-in annular baffle, and the ash outlet includes an ash outlet cylinder, a lower ash outlet arranged at the top of the ash outlet cylinder and connected to the connecting pipe channel, a discharge port arranged at the bottom end of the ash outlet cylinder, and an opening and closing cover plate covering the discharge port.

[0015] As a further solution of the present invention: a sealing frame is provided between the outer support frame and the dynamic sealing assembly, and an outer fixed frame connected to the sealing frame; the sealing frame and the outer support frame are in a submitted frame, the outer fixed frame is fixed to the side edge of the dynamic sealing assembly, a closed frame is provided between the sealing frame and the outer fixed frame, the closed frame and the sealing frame are fixedly installed by a plurality of external locking bolts, and a broken line oil filling gap is formed between the closed frame and the outer fixed frame.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention is based on the dynamic sealing technology of the rotary kiln in the prior art, and further optimizes the implementation method of the sealing cover of the rotary kiln. First, an inner spiral is welded in the spiral feed bin, so that the material transported by the feeder can quickly enter the furnace tube without accumulation, which greatly reduces the phenomenon of spitting out materials. Most of the materials enter the furnace tube under the action of the spiral thrust, and a small part of the materials may run out of the short tube into the sealing cover. The sealing cover is divided into two parts by the middle partition, and the gap between the middle partition and the short tube is only a few millimeters. Therefore, most of the materials that run out can only be discharged from the lower part of the sealing cover. If the materials that run out pass through the gap between the middle partition and the short tube, they will be blocked and fall again, and will be discharged from the gap between the middle partition and the lower part of the sealing cover. If a small amount of material enters the connecting pipe assembly, due to the U-shaped ring assembly provided between the sealing cover and the connecting pipe assembly, the intermediate gap formed is small, and the material can only flow slowly along the gap of the U-shaped structure in the middle. The bottom end of the connecting pipe assembly is provided with an ash outlet, which is a relatively large trough structure. When the material flows to this position, it will fall into the trough. The operator can clean the ash outlet regularly, so that the material cannot enter the dynamic seal, avoiding the jamming of the dynamic seal.

[0017] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings herein are incorporated into and constitute a part of the specification to illustrate embodiments consistent with the present application and are used together with the specification to explain the principles of the present application. At the same time, these drawings and text descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application for those skilled in the art by referring to specific embodiments.

[0019] Figure 1 A schematic diagram of the overall structure of a sealing cover of a rotary kiln provided in an embodiment of the present invention.

[0020] Figure 2 A schematic structural diagram of a sealing cover provided in an embodiment of the present invention.

[0021] Figure 3 For the present invention Figure 1 Schematic diagram of the structure of area A in the middle.

[0022] Figure 4 A schematic structural diagram of the docking area between a feeder and a spiral feed bin provided in an embodiment of the present invention.

[0023] Figure 5 For the present invention Figure 2 Schematic diagram of the structure of area B.

[0024] Figure 6 A schematic structural diagram of a U-shaped ring assembly and a connecting pipe assembly provided in an embodiment of the present invention.

[0025] Figure 7 A schematic structural diagram of an ash outlet provided in an embodiment of the present invention.

[0026] Figure 8 A schematic structural diagram of the docking area between a connecting pipe assembly and a dynamic sealing assembly provided in an embodiment of the present invention.

[0027] In the figure: 1. feeder; 2. sealing cover; 3. middle partition; 4. U-shaped ring assembly; 5. pipe assembly; 6. short pipe; 7. ash outlet; 8. dynamic seal assembly; 9. spiral feed bin; 11. main sealing bin; 12. auxiliary sealing bin; 13. closed mouth; 14. closed cover; 15. falling gap; 16. collecting hopper cavity; 17. ash outlet; 18. ash outlet opening and closing plate; 21. connecting hoop; 22. annular protrusion; 23. outer fixing plate; 24. outer bolt; 31. feed space; 32. spiral blade; 33. diffuser; 34. primary gap; 41. outer support frame; 42. outer closed Hoop; 43, second combined hoop plate; 44, first combined hoop plate; 45, blocking hoop; 46, base hoop plate; 47, inner blocking hoop; 48, secondary gap opening; 49, first diffuser channel; 51, annular support frame; 52, takeover channel; 53, second diffuser channel; 54, built-in annular baffle; 56, rear blocking ring piece; 57, tertiary gap opening; 58, front blocking ring piece; 61, ash cylinder; 62, discharge port; 63, opening and closing cover plate; 64, lower ash port; 71, sealing frame; 72, external fixed frame; 73, closing frame; 74, external locking bolt; 75, oil filling gap. DETAILED DESCRIPTION

[0028] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0029] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0031] In one embodiment, see Figure 1 , provides a sealing cover of a rotary kiln, including a feeder 1, a spiral feed bin 9 arranged at the output end of the feeder 1, and a dynamic sealing assembly 8 arranged on the periphery of the spiral feed bin 9; the feeder 1 is a material conveying tool, the spiral feed bin 9 is a material transfer structure of the rotary kiln, and the dynamic sealing assembly 8 is a dynamic sealing implementation structure of the rotary kiln; this embodiment is based on the dynamic sealing technology of the rotary kiln in the prior art, and further technically optimizes the implementation method of the sealing cover of the rotary kiln.

[0032] A sealing cover 2 is arranged between the spiral feed bin 9 and the feeder 1, and a middle partition 3 is built in the sealing cover 2. A short tube 6 is arranged between the spiral feed bin 9 and the sealing cover 2, and the short tube 6 is installed between the middle partition 3 and the spiral feed bin 9 and is used to connect the spiral feed bin 9 and the sealing cover 2; the middle partition 3 divides the sealing cover 2 into two parts, and there is a gap between the middle partition 3 and the outer tube wall of the short tube 6; the side edges of the dynamic sealing assembly 8 are respectively provided with a U-shaped ring assembly 4 and a connecting pipe assembly 5 connected to the U-shaped ring assembly 4; the bottom end of the connecting pipe assembly 5 is provided with an ash outlet 7, and the U-shaped ring assembly 4 is connected to the sealing cover 2.

[0033] The implementation method adopted by the prior art is to relatively simply divide the rotary furnace into two sealed bins. However, in this embodiment, an inner spiral is first welded in the spiral feed bin 9, so that the material transported by the feeder 1 can quickly enter the furnace tube without accumulation, which greatly reduces the phenomenon of spitting. When the feeder 1 feeds into the spiral feed bin 9, most of the material enters the furnace tube under the action of the spiral thrust, and a small part of the material may escape from the short tube 6 into the sealing cover 2. Since the sealing cover 2 is divided into two parts by the middle partition 3, and the gap between the middle partition 3 and the short tube 6 is only a few millimeters, most of the escaped materials can only be discharged from the lower part of the sealing cover 2. The middle partition 3 and the sealing cover 2 are welded structures, the upper part and the sealing cover 2 are continuously welded, and there is a gap between the lower end face and the sealing cover 2. If the escaped material passes through the gap between the middle partition 3 and the short tube 6, it will be blocked and fall again, and discharged from the gap between the middle partition 3 and the lower part of the sealing cover 2. If a small amount of material enters the connecting pipe assembly 5, since a U-shaped ring assembly 4 is arranged between the sealing cover 2 and the connecting pipe assembly 5, the intermediate gap formed is small, and the material can only flow slowly along the gap of the intermediate U-shaped structure. The bottom end of the connecting pipe assembly 5 is provided with an ash outlet 7, and the ash outlet 7 is a relatively large trough structure. When the material flows to this position, it will fall into the trough. The operator can clean the ash outlet 7 regularly, so that the material cannot enter the dynamic seal, avoiding the jamming of the dynamic seal.

[0034] In one embodiment, the specific implementation structure of the sealing cover 2, and the connection method of the sealing cover 2, the feeder 1 and the spiral feed bin 9 are designed as follows: See also Figure 1 and Figure 3 An outer fixing plate 23 is provided on the periphery of the barrel of the feeder 1, and a connecting hoop 21 is provided at the sealing cover 2. The connecting hoop 21 is fitted to the outer wall of the barrel of the feeder 1, and an annular protrusion 22 is provided on the outer surface of the connecting hoop 21. The annular protrusion 22 is fitted to the outer fixing plate 23 and is locked and fixed by a plurality of peripheral bolts 24.

[0035] In this embodiment, the feeder 1 is a cylindrical conveying structure, and a feeding auger is installed inside. The feeding end of the feeder 1 is provided with a hopper and a driving device for driving the feeding auger. An outer fixing plate 23 is provided on the periphery of the cylinder of the feeder 1. The cross section of the connecting hoop 21 and the annular protrusion 22 is an "L"-shaped annular structure. The annular protrusion 22 is fixedly locked with the outer fixing plate 23, and the sealing cover 2 is integrally installed on the periphery of the feeder 1.

[0036] See also Figure 1 and Figure 2 The sealing cover 2 is divided into a main sealing chamber 11 and a secondary sealing chamber 12 by a middle partition 3. The top of the main sealing chamber 11 is provided with a sealed opening 13 and a sealed cover 14 installed on the sealed opening 13. The bottom of the sealing cover 2 is provided with a collecting hopper cavity 16, an ash discharge port 17 provided at the bottom of the collecting hopper cavity 16, and an ash discharge opening and closing plate 18 installed at the ash discharge port 17. The sealing cover 2 is a circular structure, and the middle partition 3 is correspondingly designed as an annular structure and installed on the periphery of the short tube 6. There is a drop gap 15 between the middle partition 3 and the inner wall of the collecting hopper cavity 16.

[0037] The middle partition plate 3 separates the sealing cover 2 into two chambers, namely the main sealing chamber 11 and the auxiliary sealing chamber 12, and the upper and lower ends of the sealing cover 2 are respectively provided with a closed cover 14 and an ash discharge port 17. The top closed cover 14 is a closed structure, and the collecting hopper chamber 16 below is used for the accumulation of dust and dirt. The ash discharge port 17 is provided with an ash discharge opening and closing plate 18 that opens and closes regularly to discharge dust regularly.

[0038] See also Figure 2 , Figure 4 and Figure 5 The spiral feed bin 9 has a feed space 31 and a spiral blade 32 arranged in the feed space 31. The spiral blade 32 is installed on the inner wall of the spiral feed bin 9 and takes the cylinder of the feeder 1 as the axis. The spiral blade 32 is welded and installed on the inner wall of the feed space 31. The spiral feed bin 9 is externally installed with a driving mechanism to drive the spiral feed bin 9 to rotate. The rotation method can be that teeth are provided on the periphery of the spiral feed bin 9 and driven by tooth meshing, or other rotation methods can be adopted. This type of technology has been involved in the prior art and will not be elaborated in this embodiment.

[0039] A diffusion port 33 is provided between the spiral feed bin 9 and the short tube 6, and the main sealing bin 11, the short tube 6, the diffusion port 33 and the feed space 31 are sequentially connected. The short tube 6 is welded to the outer wall of the spiral feed bin 9 and rotates integrally with the spiral feed bin 9. A primary gap port 34 is provided between the upper edge area of ​​the sealing cover 2 and the short tube 6, and the main sealing bin 11 and the secondary sealing bin 12 are connected through the primary gap port 34.

[0040] Regarding the dust entering and exiting the sealing cover 2 area, this embodiment is described as follows: The material is input into the spiral feed bin 9 through the feeder 1. When the feeder 1 feeds the material into the spiral feed bin 9, most of the material enters the furnace tube under the action of the spiral thrust, and a small amount of the material may run out of the short tube 6 into the sealing cover 2; for the material entering the sealing cover 2, it will first enter the main sealing bin 11 through the short tube 6. The top of the main sealing bin 11 is provided with a closed cover 14, which is a closed structure. Most of the material in the sealing cover 2 will aggregate in the collecting hopper cavity 16 and then be discharged from the ash discharge port 17. A small part of the material enters the secondary sealing bin 12 through the primary gap port 34, but the kinetic energy of the material has been greatly reduced. Since its speed is already extremely slow, most of it will also fall along the plate, thereby falling into the collecting hopper cavity 16 through the falling gap 15, but there is still a very small amount of material (mainly suspended powder particles) floating up and entering the U-shaped ring component 4 area.

[0041] In one embodiment, for the specific implementation structure of the U-shaped ring assembly 4 and the pipe assembly 5, please refer to Figure 6 and Figure 7 , this embodiment is designed as follows: The outer edge of the spiral feed bin 9 is provided with an outer support frame 41 for supporting the U-shaped ring assembly 4, the pipe assembly 5 and the dynamic seal assembly 8. The U-shaped ring assembly 4 includes an outer closing hoop 42 installed between the sealing cover 2 and the outer support frame 41, an inner blocking hoop 47 arranged on the outer surface of the spiral feed bin 9, and an annular support frame 51 arranged on the inner edge of the outer support frame 41; the outer closing hoop 42 includes a first combined hoop plate 44 fixed on the cover wall of the sealing cover 2 and a second combined hoop plate 43 fixed on the outer support frame 41. The first combined hoop plate 44 and the second combined hoop plate 43 are then fixed and installed by bolts; the inner blocking hoop 47 includes a base hoop plate 46 installed on the outer wall of the spiral feed bin 9, and a blocking hoop member 45 fixed to the base hoop plate 46 by bolts; a first diffusion channel 49 is formed between the outer closing hoop 42 and the inner blocking hoop 47, a secondary gap opening 48 is provided between the outer wall of the sealing cover 2 and the first diffusion channel 49, and the secondary sealing bin 12 is connected to the first diffusion channel 49 through the secondary gap opening 48.

[0042] A front blocking ring sheet 58 and a rear blocking ring sheet 56 are respectively arranged on both sides of the blocking hoop 45, the front blocking ring sheet 58 is arranged on the outer side of the side of the first-level gap opening 34, a third-level gap opening 57 is formed between the rear blocking ring sheet 56 and the second combined hoop plate 43, and a second diffusion channel 53 is formed between the rear blocking ring sheet 56 and the annular support frame 51; the connecting pipe assembly 5 includes a built-in annular baffle 54 arranged at the bottom of the annular support frame 51, and a connecting pipe channel 52 formed between the built-in annular baffle 54 and the outer wall of the spiral feed bin 9, and the connecting pipe channel 52 is connected to the second diffusion channel 53.

[0043] The outer support frame 41, the outer closing hoop 42 and the sealing cover 2 are fixedly installed and in a fixed state, and the inner blocking hoop 47 is fixedly installed with the spiral feed bin 9, so that it rotates with the spiral feed bin 9; the trace material floating in the secondary sealing bin 12 enters the top area, bypasses the front blocking ring piece 58 and enters the secondary gap opening 48, so that the secondary gap opening 48 enters the first diffuse flow channel 49, and then bypasses the rear blocking ring piece 56 in the first diffuse flow channel 49, enters the second diffuse flow channel 53 at the third gap opening 57, and then enters the connecting pipe channel 52 from the second diffuse flow channel 53. The overall flow trajectory is a curved path, forming a U-shaped ring space, and there is a small space gap. The material can only flow slowly along the gap between the connecting pipe and the feed pipe, which greatly consumes the kinetic energy of this type of material; therefore, when the material enters the connecting pipe channel 52, the kinetic energy is insufficient to support further floating, and it can only fall from the connecting pipe channel 52 to the ash outlet 7; thereby effectively preventing this type of suspended particulate matter from entering the dynamic sealing assembly 8, and the staff only needs to clean the ash outlet 7 regularly.

[0044] In one embodiment, for the specific implementation structure of the ash outlet 7, please refer to Figure 6 and Figure 7 , this embodiment is designed as follows The ash outlet 7 is arranged at the bottom of the built-in annular baffle 54, and the ash outlet 7 includes an ash outlet cylinder 61, a lower ash outlet 64 arranged at the top of the ash outlet cylinder 61 and connected to the pipe connection channel 52, a discharge port 62 arranged at the bottom of the ash outlet cylinder 61, and an opening and closing cover plate 63 covering the discharge port 62. The pipe connection channel 52 is an annular space arranged between the built-in annular baffle 54 and the spiral feed bin 9. The main body of the ash outlet 7 is the ash outlet cylinder 61, which is installed at the bottom of the built-in annular baffle 54. After losing kinetic energy support, this type of material falls into the ash outlet cylinder 61 by gravity and is then discharged from the lower ash outlet 64. The opening and closing cover plate 63 is convenient for the staff to clean it regularly.

[0045] In one embodiment, for the implementation structure of the middle area between the outer support frame 41 and the dynamic seal assembly 8, please refer to Figure 6 and Figure 8 , this embodiment is designed as follows: A sealing frame 71 and an outer fixed frame 72 that is connected to the sealing frame 71 are provided between the outer support frame 41 and the dynamic seal assembly 8; the sealing frame 71 and the outer support frame 41 are in a submitted frame, the outer fixed frame 72 is fixed to the side edge of the dynamic seal assembly 8, a closing frame 73 is provided between the sealing frame 71 and the outer fixed frame 72, the closing frame 73 and the sealing frame 71 are fixedly installed by a plurality of external locking bolts 74, and a broken line oil filling gap 75 is formed between the closing frame 73 and the outer fixed frame 72; The sealing frame 71 is arranged on the outside of the annular support frame 51 and the connecting pipe channel 52, the sealing frame 71 is fixedly installed with the outer support frame 41, the outer fixed frame 72 is fixedly installed with the sealing frame 71, and the closing frame 73 is installed on the dynamic sealing assembly 8 and is in a rotating state; therefore, the closing frame 73 and the outer fixed frame 72 are interlocked with each other and have a tendency to move relative to each other, and a broken line oil filling gap 75 is formed between the closing frame 73 and the outer fixed frame 72. During operation, the sealing oil is injected to fill the oil filling gap 75 to maximize the prevention of materials from entering the dynamic sealing assembly 8.

[0046] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0047] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A sealing cover for a rotary kiln, comprising a feeder (1), a spiral feed bin (9) arranged at an output end of the feeder (1), and a dynamic sealing assembly (8) arranged at the periphery of the spiral feed bin (9); characterized in that: A sealing cover (2) is arranged between the spiral feed bin (9) and the feeder (1), and a middle partition (3) is built into the sealing cover (2). A short tube (6) is arranged between the spiral feed bin (9) and the sealing cover (2), and the short tube (6) is installed between the middle partition (3) and the spiral feed bin (9) and is used to connect the spiral feed bin (9) and the sealing cover (2); the middle partition (3) divides the sealing cover (2) into two parts, and there is a gap between the middle partition (3) and the outer tube wall of the short tube (6); The side edges of the dynamic seal assembly (8) are respectively provided with a U-shaped ring assembly (4) and a pipe assembly (5) connected to the U-shaped ring assembly (4); the bottom end of the pipe assembly (5) is provided with an ash outlet (7), and the U-shaped ring assembly (4) is connected to the sealing cover (2).

2. The sealing cover of a rotary kiln according to claim 1, characterized in that: The sealing cover (2) is divided into a main sealing chamber (11) and a secondary sealing chamber (12) by a middle partition (3); the top of the main sealing chamber (11) is provided with a sealed opening (13), and a sealed cover (14) installed on the sealed opening (13); the bottom of the sealing cover (2) is provided with a collecting hopper cavity (16), an ash discharge port (17) arranged at the bottom of the collecting hopper cavity (16), and an ash discharge opening and closing plate (18) installed at the ash discharge port (17).

3. The sealing cover of the rotary kiln according to claim 2, characterized in that: The sealing cover (2) is of a circular structure, and the middle partition (3) is correspondingly designed as an annular structure and is installed on the periphery of the short tube (6). There is a drop gap (15) between the middle partition (3) and the inner wall of the collecting hopper cavity (16).

4. The sealing cover of a rotary kiln according to claim 1, characterized in that: An outer fixing plate (23) is arranged on the periphery of the barrel of the feeder (1), and a connecting hoop (21) is arranged at the sealing cover (2). The connecting hoop (21) is fitted to the outer wall of the barrel of the feeder (1), and an annular protrusion (22) is arranged on the outer surface of the connecting hoop (21). The annular protrusion (22) is fitted to the outer fixing plate (23) and is locked and fixed by a plurality of peripheral bolts (24).

5. The sealing cover of a rotary kiln according to claim 3, characterized in that: The spiral feeding bin (9) has a built-in feeding space (31) and a spiral blade (32) arranged in the feeding space (31); the spiral blade (32) is installed on the inner wall of the spiral feeding bin (9) and takes the cylinder of the feeder (1) as an axis; a diffusion port (33) is arranged between the spiral feeding bin (9) and the short tube (6); and the main sealing bin (11), the short tube (6), the diffusion port (33) and the feeding space (31) are sequentially connected.

6. The sealing cover of the rotary kiln according to claim 5, characterized in that: A primary gap opening (34) is provided between the upper edge area of ​​the sealing cover (2) and the short tube (6), and the primary sealing chamber (11) and the secondary sealing chamber (12) are connected via the primary gap opening (34).

7. The sealing cover of a rotary kiln according to claim 6, characterized in that: The outer edge of the spiral feed bin (9) is provided with an outer support frame (41) for supporting a U-shaped ring assembly (4), a pipe assembly (5) and a dynamic seal assembly (8); the U-shaped ring assembly (4) comprises an outer closing hoop (42) installed between the sealing cover (2) and the outer support frame (41), an inner blocking hoop (47) arranged on the outer surface of the spiral feed bin (9), and an annular support frame (51) arranged on the inner edge of the outer support frame (41); the outer closing hoop (42) comprises a first combined hoop plate (44) fixed on the cover wall of the sealing cover (2) and a second combined hoop plate (43) fixed on the outer support frame (41). , the first combined hoop plate (44) and the second combined hoop plate (43) are fixedly installed by bolts; the inner blocking hoop (47) comprises a base hoop plate (46) installed on the outer wall of the spiral feed bin (9), and a blocking hoop member (45) fixed to the base hoop plate (46) by bolts; a first diffuser channel (49) is formed between the outer closing hoop (42) and the inner blocking hoop (47); a secondary gap opening (48) is provided between the outer wall of the sealing cover (2) and the first diffuser channel (49); and the secondary sealing bin (12) is connected to the first diffuser channel (49) through the secondary gap opening (48).

8. The sealing cover of a rotary kiln according to claim 7, characterized in that: A front blocking ring sheet (58) and a rear blocking ring sheet (56) are respectively arranged on both sides of the blocking hoop member (45); the front blocking ring sheet (58) is arranged on the outer side of the side edge of the primary gap opening (34); a third gap opening (57) is formed between the rear blocking ring sheet (56) and the second combined hoop plate (43); and a second diffuser channel (53) is formed between the rear blocking ring sheet (56) and the annular support frame (51); the pipe connection assembly (5) comprises a built-in annular baffle plate (54) arranged at the bottom of the annular support frame (51); and a pipe connection channel (52) formed between the built-in annular baffle plate (54) and the outer wall of the spiral feed bin (9); the pipe connection channel (52) is connected to the second diffuser channel (53).

9. The sealing cover of a rotary kiln according to claim 8, characterized in that: The ash outlet (7) is arranged at the bottom of the built-in annular baffle (54), and comprises an ash outlet cylinder (61), a lower ash outlet (64) arranged at the top of the ash outlet cylinder (61) and connected to the connecting pipe channel (52), a discharge port (62) arranged at the bottom end of the ash outlet cylinder (61), and an opening and closing cover plate (63) covering the discharge port (62).

10. The sealing cover of a rotary kiln according to claim 9, characterized in that: A sealing frame (71) and an external fixed frame (72) that is connected to the sealing frame (71) are provided between the external support frame (41) and the dynamic seal assembly (8); the sealing frame (71) and the external support frame (41) are in a frame-to-frame relationship, the external fixed frame (72) is fixed to the side edge of the dynamic seal assembly (8), a closing frame (73) is provided between the sealing frame (71) and the external fixed frame (72), the closing frame (73) and the sealing frame (71) are fixedly mounted via a plurality of external locking bolts (74), and a broken-line oil-filled gap (75) is formed between the closing frame (73) and the external fixed frame (72).

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