Sealing device for rotary kiln

Abstract

The utility model discloses a sealing device for a rotary kiln, and belongs to the technical field of rotary kiln sealing. The sealing device comprises a mounting seat, one side of the mounting seat is connected with a first connecting ring, an annular first space is formed between the first connecting ring and the opposite side wall of the mounting seat, and a sealing mechanism is arranged in the first space; the sealing mechanism comprises a plurality of positioning blocks which are arranged on the side wall of the first connecting ring at intervals in an annular mode, an elastic sealing piece is arranged between every two adjacent positioning blocks in a clamped mode, and each elastic sealing piece is provided with a pressing block which is used for pressing the elastic sealing piece in the radial direction. According to the sealing device for the rotary kiln, compared with a traditional fish scale type installation mode, the elastic sealing piece is connected in a clamping mode, and the disassembly and assembly difficulty of the elastic sealing piece can be greatly reduced. And meanwhile, each elastic sealing piece is provided with an independent pressing block, so that the pressing effect of the elastic sealing pieces with different abrasion degrees can be better adapted.

Description

Technical Field

[0001] The utility model belongs to the technical field of rotary kiln sealing, and more specifically relates to a sealing device for a rotary kiln. Background Art

[0002] In the production of lithium battery graphite negative electrode materials, materials need to be granulated or carbonized in a protective gas atmosphere. Once the seal leaks, the outside air is sucked into the rotary kiln, causing volatiles to carry the materials out. At the same time, it will cause the volatiles and even the materials to burn inside or outside the kiln cylinder, resulting in a serious decline in product output and quality. Therefore, as a sealing device connecting the high-temperature rotating cylinder of the rotary kiln and the fixed kiln tail cover, it is necessary to ensure the continuous sealing performance between the outer surface of the rotary kiln cylinder and the sealing contact surface, and it is required to operate normally under certain high-temperature conditions.

[0003] At present, the popular rotary kiln devices on the market are mainly formed by two groups of mechanical seals and gas seals, or a combination of the two forms. For example, in the patent application CN206539705U, a wear-resistant composite flexible sealing device is disclosed. The application includes a sealing body and a connecting sleeve, one open end of the sealing body is sleeved on the outer wall of the rotating component, the other open end of the sealing body is fixedly connected to the conical structure at one end of the connecting sleeve, and the other end of the connecting sleeve is fixedly connected to the fixed component. The sealing body is a conical layered structure, the outer layer of the sealing body is composed of a number of steel plate fish scales distributed along the circumferential direction, the inner layer of the sealing body is composed of a number of stainless steel sheets distributed along the circumferential direction, and an intermediate layer composed of a number of carbon-silicon-aluminum composite plates distributed along the circumferential direction is provided between the outer layer and the inner layer of the sealing body. A number of wear-resistant ceramic sheets distributed along the circumferential direction are fixedly connected to the inner wall of the inner layer of one open end of the sealing body and are sleeved on the outer wall of the rotating component through the wear-resistant ceramic sheets.

[0004] For example, patent CN211060627U discloses a rotary kiln and its double-layer elastic sealing device. The application includes two cylinders, with a connecting cover mounted at the junction of the two cylinders. Both ends of the connecting cover are provided with elastic sealing mechanisms. The elastic sealing mechanism includes an annular cone and a sealing assembly. The larger end of the annular cone is connected to the connecting cover via a transition flange, and the other end is connected to the sealing assembly via bolts. The end of the sealing assembly away from the annular cone abuts against the outer wall of the cylinder. A pressing mechanism is provided on the outside of the sealing assembly. The sealing assembly includes inner elastic sealing sheets arranged in a fish-scale pattern along the circumference of the cylinder. Outer elastic sealing sheets arranged in a fish-scale pattern along the circumference of the cylinder are provided on the outside of the inner elastic sealing sheets. A heat insulation plate is provided between the inner and outer elastic sealing sheets.

[0005] While the aforementioned applications all involve technical improvements to rotary drum sealing devices, they still exhibit certain drawbacks. For example, the fish-scale arrangement of the sealing plates makes installation and replacement of the sealing device relatively cumbersome. Furthermore, while the overall winding of the wire rope provides some radial compensation for the sealing plates, the wear and deformation of each component vary during operation, making the overall winding method inadequate for leaks caused by severe wear. Utility Model Content

[0006] 1. Problems to be solved

[0007] To address at least some of the problems with the prior art, the present invention provides a rotary kiln sealing device. This technical solution simplifies the installation and removal of seals while maintaining sealing performance. Furthermore, by applying radial pressure to each seal individually, the radial pressure can be adjusted based on the wear of each seal.

[0008] 2. Technical solution

[0009] In order to solve the above problems, the technical solutions adopted by the present invention are as follows:

[0010] The utility model provides a sealing device for a rotary kiln, comprising a mounting seat, one side of which is connected to a first connecting ring, an annular first space being formed between the first connecting ring and the opposite side wall of the mounting seat, and a sealing mechanism being provided in the first space;

[0011] The sealing mechanism includes a plurality of positioning blocks in the form of annular spaced portions on the side wall of the first connecting ring, elastic seals are clamped between adjacent positioning blocks, and each elastic seal is equipped with a pressing block for radially pressing the elastic seal.

[0012] Furthermore, the positioning block is a trapezoidal structure with a larger upper portion and a smaller lower portion as a whole, and the thickness of the trapezoidal positioning block is smaller than the thickness of the elastic sealing member.

[0013] Furthermore, the pressing block is equipped with a pressing spring, and both ends of the pressing spring are respectively arranged on the positioning blocks on both sides of the elastic seal to be pressed.

[0014] Furthermore, the compression block is provided with a slot for the compression spring to be inserted into, and there are multiple slots along the length direction of the compression block. The middle part of the compression spring is inserted into different slots to provide different compression forces for the elastic seal.

[0015] Furthermore, a pressing sheet is provided between the pressing block and the elastic sealing member.

[0016] Furthermore, the elastic sealing member is formed by two layers of packing stacked one above the other, and the packing is wire-reinforced graphite packing or high-carbon fiber packing.

[0017] Furthermore, a second connecting ring is provided on the side of the first connecting ring away from the mounting seat, and a second space is formed between the two connecting rings. A sealing mechanism is provided in the second space, and the positioning blocks in the two mounting spaces are staggered.

[0018] Furthermore, the cross section of the mounting seat is a U-shaped structure, one side of which is used to connect to the kiln tail cover, and the other side is connected to the first connecting ring and the second connecting ring through connecting bolts.

[0019] 3. Beneficial effects

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] (1) The utility model relates to a sealing device for a rotary kiln. The elastic seal can be directly mounted on adjacent positioning blocks on the side wall of the first connecting ring. Compared with the traditional fish-scale installation method, the difficulty of installing and removing the elastic seal is greatly reduced. At the same time, each elastic seal is equipped with a separate compression block for radially compressing the elastic seal, which can better adapt to the compression effect of elastic seals with different degrees of wear.

[0022] (2) In the sealing device for a rotary kiln of the present invention, the thickness of the positioning block is slightly smaller than the thickness of the elastic seal, so that after the elastic seal is installed, its two sides are respectively pressed against the side wall of the first connecting ring and the side surface of the mounting seat, which is beneficial to improving the sealing performance between the contact surfaces.

[0023] (3) The utility model provides a sealing device for a rotary kiln, wherein a plurality of slots for a compression spring to be inserted into are provided on the compression block. The middle portion of the compression spring is inserted into different slots to provide different compression forces for the elastic seal.

[0024] (4) The present invention provides a sealing device for a rotary kiln. A sealing mechanism is provided in the second space formed between the first connecting ring and the second connecting ring, and the positioning blocks in the two spaces are staggered. Consequently, the contact surfaces between the positioning blocks and the elastic sealing members in the two spaces are also staggered, further improving the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural schematic diagram of a sealing device for a rotary kiln according to the present invention;

[0026] Figure 2 This is a schematic structural diagram of the sealing mechanism in the present invention;

[0027] Figure 3This is a schematic diagram of the internal structure of a sealing device for a rotary kiln according to the present invention;

[0028] Figure 4 for Figure 3 Cross-sectional view along the AA axis.

[0029] In the figure: 1, mounting seat; 2, first connecting ring; 21, first space;

[0030] 3. Sealing mechanism; 31. Positioning block; 32. Elastic sealing element; 33. Pressing block; 331. Slot; 34. Pressing spring; 35. Pressing piece;

[0031] 4. Second connecting ring; 41. Second space; 5. Connecting bolt. DETAILED DESCRIPTION

[0032] In order to further understand the content of the present invention, the present invention is described in detail with reference to the accompanying drawings.

[0033] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] The present invention will be further described below in conjunction with specific embodiments.

[0035] like Figure 1 As shown, a rotary kiln sealing device of this embodiment includes a mounting base 1, a first connecting ring 2, and a sealing mechanism 3. An annular first space 21 is formed between the first connecting ring 2 and the opposite side walls of the mounting base 1, and the sealing mechanism 3 is located in the first space 21.

[0036] Specifically, refer to Figure 2 、 Figure 3 、 Figure 4 As shown, the mounting base 1 and the first connecting ring 2 are coaxially arranged hollow annular structures. The cross section of the mounting base 1 is a U-shaped structure, one side of which is used to connect to the kiln tail cover, and the other side is connected to the first connecting ring 2 and then sleeved on the outer peripheral wall of the rotary cylinder.

[0037] The sealing mechanism 3 includes a plurality of positioning blocks 31 in an annular spaced portion on the side wall of the first connecting ring 2 , with elastic seals 32 clamped between adjacent positioning blocks 31 , and each elastic seal 32 is equipped with a pressing block 33 for radially pressing the elastic seal 32 .

[0038] Among them, the positioning block 31 is a trapezoidal structure with a larger upper part and a smaller lower part, and the thickness of the trapezoidal positioning block 31 is less than the thickness of the elastic seal 32. After the elastic seal 32 is installed, its two sides are respectively squeezed against the side walls of the first connecting ring 2 and the side surfaces of the mounting seat 1, which is beneficial to improving the sealing performance between the contact surfaces. Of course, after the elastic seal 32 is inserted into the gap between the two positioning blocks 31, its two ends also need to produce a certain degree of extrusion deformation with the corresponding positioning blocks 31 to ensure the sealing effect at the end contact. At the same time, the elastic seal 32 needs to partially extend out of the bottom of the positioning block 31 and contact the outer peripheral wall of the rotating cylinder for sealing.

[0039] It should be noted that the above thickness refers to the distance extending along the axial direction of the sealing device. Figure 4 The left and right directions are the two side directions of the elastic seal 32, the front and back directions are the directions of the two ends, and the up and down directions are the directions of the top and bottom.

[0040] At the same time, the pressing block 33 also needs to be equipped with a pressing spring 34 , and both ends of the pressing spring 34 are respectively arranged on the positioning blocks 31 at both ends of the elastic seal 32 to be pressed.

[0041] Preferably, the compression block 33 is provided with a slot 331 for the middle portion of the compression spring 34 to engage, and multiple slots 331 are provided along the length of the compression block 33. Engaging the middle portion of the compression spring 34 in different slots 331 can provide different compression forces for the elastic seal 32. Furthermore, a pressing plate 35 is provided between the compression block 33 and the elastic seal 32 to increase the contact area with the elastic seal 32 and ensure a more effective compression.

[0042] Specifically in this embodiment, the elastic sealing member 32 may be formed by stacking two layers of packing, and the packing may be metal wire reinforced graphite packing or high carbon fiber packing.

[0043] In this embodiment of a rotary kiln sealing device, the elastic seals 32 are directly mounted using a snap-on mechanism, significantly simplifying installation, compared to the traditional fish-scale installation method. Furthermore, each elastic seal 32 is equipped with a separate compression block 33 for radially compressing the elastic seal 32, enabling better compression of elastic seals 32 with varying degrees of wear.

[0044] As another implementation of this embodiment, a second connecting ring 4 is further provided on the side of the first connecting ring 2 away from the mounting seat 1, and a second space 41 is formed between the two connecting rings. The second space 41 is also provided with the above-mentioned sealing mechanism 3, and the positioning blocks 31 in the two mounting spaces are staggered.

[0045] Specifically, the mounting base 1 can be fixed to the kiln tail cover via flanges and fasteners. The positioning block 31 can be pre-welded to the sidewalls of the first connecting ring 2 and the second connecting ring 4. The first connecting ring 2, the second connecting ring 4 and the mounting base 1 can be connected via connecting bolts 5.

[0046] In the rotary kiln sealing device of this embodiment, the two sealing mechanisms 3 are staggered so that the contact surfaces between the positioning blocks 31 and the elastic sealing members 32 in the two spaces are also staggered, thereby further improving the sealing effect.

[0047] The above is a schematic description of the present invention and its embodiments, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by this and, without departing from the inventive purpose of the present invention, designs a structure and embodiment similar to the technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A sealing device for a rotary kiln, characterized in that: The invention comprises a mounting seat (1), a first connecting ring (2) being connected to one side of the mounting seat (1), a first annular space (21) being formed between the first connecting ring (2) and the opposite side wall of the mounting seat (1), and a sealing mechanism (3) being provided in the first space (21); The sealing mechanism (3) comprises a plurality of positioning blocks (31) on the side wall of the first connecting ring (2) in the form of an annular spaced portion, elastic sealing members (32) are clamped between adjacent positioning blocks (31), and each elastic sealing member (32) is equipped with a pressing block (33) for radially pressing the elastic sealing member (32).

2. A sealing device for a rotary kiln according to claim 1, characterized in that: The positioning block (31) is a trapezoidal structure with a larger upper portion and a smaller lower portion as a whole, and the thickness of the positioning block (31) is smaller than the thickness of the elastic sealing member (32).

3. A sealing device for a rotary kiln according to claim 2, characterized in that: The pressing block (33) is equipped with a pressing spring (34), and both ends of the pressing spring (34) are respectively arranged on the positioning blocks (31) at both ends of the elastic sealing member (32) to be pressed.

4. A sealing device for a rotary kiln according to claim 3, characterized in that: The compression block (33) is provided with a slot (331) for the compression spring (34) to be inserted into, and a plurality of slots (331) are provided along the length direction of the compression block (33). The middle portion of the compression spring (34) is inserted into different slots (331) to provide different compression forces for the elastic seal (32).

5. The sealing device for a rotary kiln according to claim 4, characterized in that: A pressing sheet (35) is provided between the pressing block (33) and the elastic sealing member (32).

6. The sealing device for a rotary kiln according to claim 5, characterized in that: The elastic sealing member (32) is formed by stacking two layers of packing, and the packing is a metal wire reinforced graphite packing or a high carbon fiber packing.

7. A sealing device for a rotary kiln according to any one of claims 1 to 6, characterized in that: A second connecting ring (4) is further provided on the side of the first connecting ring (2) away from the mounting seat (1), and a second space (41) is formed between the two connecting rings. A sealing mechanism (3) is provided in the second space (41), and the positioning blocks (31) in the two mounting spaces are staggered.

8. The sealing device for a rotary kiln according to claim 7, characterized in that: The cross section of the mounting seat (1) is a U-shaped structure, one side of which is used to connect to the kiln tail cover, and the other side is connected to the first connecting ring (2) and the second connecting ring (4) via connecting bolts (5).

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