A rotary kiln head protective sealing structure

Abstract

The utility model discloses a rotary kiln head protective sealing structure, comprising a kiln barrel, a connecting ring is installed at the left end of the kiln barrel, a cold air sleeve is sleeved on the surface of the kiln barrel, a first connecting sleeve is sleeved on the surface of the cold air sleeve, a second connecting sleeve is connected to the right end of the first connecting sleeve, and a bellows is installed on the inner wall of the second connecting sleeve, a first cone flange is provided on the inner wall of the first connecting sleeve, a first steel fish scale is installed between the first cone flange and the cold air sleeve, a second cone flange is installed on the right side of the second connecting sleeve, and a second steel fish scale is provided between the second cone flange and the kiln barrel, and an enclosed area between the first steel fish scale, the second steel fish scale and the cold air sleeve is slightly positively pressurized, and the kiln mouth guard iron can be cooled while flying sand and smoke can be blocked from overflowing, the first steel fish scale and the second steel fish scale can also improve the sealing effect, the air leakage coefficient is low, the effect of reducing energy consumption is significant, and the calcining condition of the rotary kiln is stabilized.

Description

Technical Field

[0001] The utility model relates to the technical field of metallurgy, chemical industry and cement clinker production, in particular to a rotary kiln head protective sealing structure. Background Art

[0002] The rotary kiln is one of the equipment used in iron ore roasting and cement clinker production. In order to prevent material leakage, the rotary kiln will use a sealing device. The existing sealing device is located between the rotating cylinder and the stationary cover to prevent the outside cold air from entering the kiln and destroying the material-gas balance of the kiln system. At present, the sealing device is often sealed with steel fish scales and movable spring plates, but as the elasticity of the fish scales gradually decreases, the degree of compression gradually weakens, and the packing is damaged, gaps and holes will appear in the seal of the kiln cylinder. The bending and deformation of the kiln cylinder will also cause the seal to fail, resulting in material leakage and air leakage. The workload during maintenance is large, which is not conducive to the stability of the kiln calcination process. Utility Model Content

[0003] The utility model aims to provide a rotary kiln head protective sealing structure to solve the problems raised in the above background technology.

[0004] To achieve the above object, the utility model provides the following technical solutions: a rotary kiln head protective sealing structure, comprising a kiln barrel, a connecting ring is installed at the left end of the kiln barrel, a cold air jacket is sleeved on the surface of the kiln barrel, and the cold air jacket is inserted into the connecting ring;

[0005] The surface of the cold air sleeve is sleeved with a first connecting sleeve, the right end of the first connecting sleeve is connected to the second connecting sleeve, and a bellows is installed on the inner wall of the second connecting sleeve, a trumpet is provided on the left side of the bellows, a first cone flange is provided on the inner wall of the first connecting sleeve, and a first steel fish scale is installed between the first cone flange and the cold air sleeve;

[0006] The cold air blowing out of the bellows will form a slight positive pressure to suppress a small amount of flying sand. Under the action of gravity, the flying sand is collected by the funnel and enters the grate cooler;

[0007] A second cone flange is installed on the right side of the second connecting sleeve, and a second steel fish scale is provided between the second cone flange and the kiln shell;

[0008] The first steel fish scale and the second steel fish scale cooperate with the cold air sleeve to form an enclosed area. This area has a slightly positive pressure, which can cool the kiln mouth guard iron while preventing flying sand and smoke from overflowing.

[0009] Furthermore, a friction sleeve is sleeved on the right side of the surface of the kiln cylinder, and the second steel fish scale is located outside the friction sleeve. The friction sleeve protects the kiln cylinder from wear and tear, thereby ensuring that the service life of the kiln cylinder can be extended.

[0010] Furthermore, a guide groove is provided on the inner wall of the cold air sleeve, a movable spring plate is installed on the right side of the guide groove, and a material blocking flange is fixedly connected to the left end of the first connecting sleeve. The material blocking flange and the movable spring plate can block flying sand, and the flying sand falls into the guide groove due to gravity. A funnel is installed on the lower surface of the first connecting sleeve, and the funnel sends the collected flying sand to the grate cooler.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] (1) The enclosed area between the first steel fish scale, the second steel fish scale and the cold air sleeve is slightly positively pressurized, which can cool the kiln mouth guard iron while preventing flying sand and smoke from overflowing.

[0013] (2) The first steel fish scale and the second steel fish scale can also improve the sealing effect, reduce the air leakage coefficient, significantly reduce energy consumption, and stabilize the calcining conditions of the rotary kiln.

[0014] (3) The cooling air blown out by the fan can be blown along the guide groove on the cold air sleeve to the vicinity of the kiln mouth guard iron. An air outlet is opened on one side of the funnel to discharge the hot air and continuously cool the front section of the kiln cylinder to avoid deformation of the kiln cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view of the utility model;

[0016] Figure 2 It is a cross-sectional view of the utility model.

[0017] In the figure: 1. kiln cylinder; 2. connecting ring; 3. side wall of kiln head cover; 4. funnel; 5. second connecting sleeve; 6. second cone flange; 7. second steel fish scale; 8. material blocking flange; 9. cold air sleeve; 10. guide groove; 11. movable spring plate; 12. first cone flange; 13. first steel fish scale; 14. bellows; 15. friction sleeve; 16. trumpet pipe; 17. fire stop ring; 18. first connecting sleeve. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] Example:

[0020] See also Figure 1-2A rotary kiln head protective sealing structure comprises a kiln body 1, a connecting ring 2 is installed at the left end of the kiln body 1, a cold air jacket 9 is sleeved on the surface of the kiln body 1, and the cold air jacket 9 is inserted into the connecting ring 2, the cold air jacket 9 does not contact the kiln body 1, a certain space is reserved, and the connecting ring 2 plays a sealing role;

[0021] The surface of the cold air sleeve 9 is sleeved with a first connecting sleeve 18, the right end of the first connecting sleeve 18 is connected to the second connecting sleeve 5, and the inner wall of the second connecting sleeve 5 is installed with a bellows 14, the bellows 14 is connected to the fan, so that the air blown out by the fan blows in along the bellows 14, and a trumpet pipe 16 is provided on the left side of the bellows 14 to guide the flow of flying sand;

[0022] A first cone flange 12 is provided on the inner wall of the first connecting sleeve 18, and a first steel fish scale 13 is installed between the first cone flange 12 and the cold air sleeve 9;

[0023] A second conical flange 6 is installed on the right side of the second connecting sleeve 5, and a second steel fish scale 7 is arranged between the second conical flange 6 and the kiln shell 1. The first steel fish scale 13 and the second steel fish scale 7 are elastic, and the greater the positive pressure, the tighter the first steel fish scale 13 and the second steel fish scale 7 are attached, and the better the sealing effect.

[0024] The contact surface between the second steel fish scale 7 and the kiln shell 1 is coated with butter to reduce the rigid friction between the two, which can effectively reduce the wear and bending deformation of the steel fish scale, improve its sealing performance, extend its service life, and reduce downtime.

[0025] In this embodiment, if Figure 2 As shown, a fire stop ring 17 is provided on the inner wall of the cold air jacket 9, and the fire stop ring 17 is located on the side of the connecting ring 2. The fire stop ring 17 reduces heat loss in the rotary kiln, improves thermal efficiency, protects the kiln shell 1 and extends the service life of the kiln shell 1.

[0026] In this embodiment, if Figure 2 As shown, a friction sleeve 15 is sleeved on the right side of the surface of the kiln cylinder 1, and the second steel fish scale 7 is located outside the friction sleeve 15. The friction sleeve 15 is made of wear-resistant material. The thickness of the friction sleeve 15 is only 6 mm, which has good wear resistance and has little effect on the thermal expansion of the kiln cylinder 1. It is both wear-resistant and will not damage the kiln cylinder 1.

[0027] In this embodiment, if Figure 2 As shown, the inner wall of the cold air jacket 9 is provided with a guide groove 10, and a movable spring plate 11 is installed on the right side of the guide groove 10. The movable spring plate 11 mainly reduces the vibration of the machine, maintains the stability of the rotary kiln, and ensures uniform heating of the material in the cylinder.

[0028] In this embodiment, if Figure 2As shown, a funnel 4 is installed on the lower surface of the first connecting sleeve 18, and the funnel 4 collects flying sand to ensure that the leaked flying sand can be recycled and reused.

[0029] In this embodiment, if Figure 2 As shown, the left end of the first connecting sleeve 18 is fixedly connected to a material blocking flange 8, and the left side of the material blocking flange 8 is provided with a kiln head cover side wall 3. The material blocking flange 8 can block flying sand, making most of the flying sand lose kinetic energy and avoiding flying sand.

[0030] Specifically, when in use, the kiln body 1 is in a negative pressure state when working normally, but in actual operation, a positive pressure state may occasionally occur; when under positive pressure, the dust-laden gas passes through the kiln head guard iron and is ejected outward along the outer circle of the cold air sleeve 9 to form flying sand, which hits the material retaining flange 8. Most of the flying sand loses kinetic energy due to the impact and is collected by the funnel 4 under the action of gravity and enters the grate cooler. The remaining flying sand continues to move forward and is collected by the first cone flange 12, the second cone flange 6, the first steel fish scale 13, and the second steel fish scale 7. The flying sand is blocked by the barrier formed and collected by the funnel 4 and enters the grate cooler through the chute; a small part of the flying sand breaks through the first steel fish scale 13 and the second steel fish scale 7, runs out from the gap between the first steel fish scale 13, the second steel fish scale 7 and the cold air sleeve 9, and enters the enclosed space formed by the first steel fish scale 13, the second steel fish scale 7 and the second connecting sleeve 5. The cold air blown out of the bellows 14 will form a slight positive pressure to suppress a small amount of flying sand that has escaped. Under the action of gravity, the flying sand is collected by the funnel 4 and enters the grate cooler.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rotary kiln head protective sealing structure, characterized in that: It comprises a kiln cylinder (1), a connecting ring (2) is installed at the left end of the kiln cylinder (1), a cold air sleeve (9) is sleeved on the surface of the kiln cylinder (1), and the cold air sleeve (9) is inserted into the interior of the connecting ring (2); The surface of the cold air sleeve (9) is sleeved with a first connecting sleeve (18), the right end of the first connecting sleeve (18) is connected to the second connecting sleeve (5), and a bellows (14) is installed on the inner wall of the second connecting sleeve (5), a trumpet tube (16) is provided on the left side of the bellows (14), the inner wall of the first connecting sleeve (18) is provided with a first cone flange (12), and a first steel fish scale (13) is installed between the first cone flange (12) and the cold air sleeve (9); A second cone flange (6) is installed on the right side of the second connecting sleeve (5), and a second steel fish scale (7) is provided between the second cone flange (6) and the kiln shell (1).

2. The rotary kiln head protective sealing structure according to claim 1, characterized in that: The inner wall of the cold air sleeve (9) is provided with a fire stop ring (17), and the fire stop ring (17) is located on the side of the connecting ring (2).

3. The rotary kiln head protective sealing structure according to claim 1, characterized in that: A friction sleeve (15) is sleeved on the right side of the surface of the kiln shell (1), and the second steel fish scale (7) is located outside the friction sleeve (15).

4. The rotary kiln head protective sealing structure according to claim 1, characterized in that: The inner wall of the cold air jacket (9) is provided with a guide groove (10), and a movable spring plate (11) is installed on the right side of the guide groove (10).

5. The rotary kiln head protective sealing structure according to claim 1, characterized in that: A funnel (4) is mounted on the lower surface of the first connecting sleeve (18).

6. The rotary kiln head protective sealing structure according to claim 1, characterized in that: The left end of the first connecting sleeve (18) is fixedly connected to a material blocking flange (8), and the left side surface of the material blocking flange (8) is provided with a kiln head cover side wall (3).

Images