Multi-layer seal of large external heating type rotary kiln

Abstract

The utility model discloses a multi-layer seal of a large external heating type rotary kiln, and relates to the technical field of rotary kiln devices. The kiln end cover is sleeved on the cylinder body; the partition plate is mounted on the inner wall of the kiln end cover; the sealing assembly is installed at the end of the kiln end cover, and the inner side of the sealing assembly is in contact sealing with the outer wall of the barrel; the sealing assembly comprises a packing sealing piece which is arranged on the outer wall of the barrel in a sleeving mode, and one side of the packing sealing piece makes contact with the partition plate. And the nitrogen sealing piece is mounted at the end part of the kiln end cover, and the nitrogen sealing piece is in contact fit with the other side of the packing sealing piece. The external heating type rotary kiln solves the technical problem that the sealing performance of the cylinder body of the existing external heating type rotary kiln is not enough under the condition of a hot state.

Description

TECHNICAL FIELD

[0001] The utility model relates to rotary kiln device technical field especially relates to a multilayer sealing of large -scale external heating type rotary kiln. BACKGROUND

[0002] Traditional incineration type rotary kiln mainly takes internal heating type as the main, and the flame is burnt or heated to the material in the rotary kiln under the condition of oxygen, and the sealing requirement of kiln body and kiln end cover (kiln head cover, kiln tail cover) is not high.

[0003] Compared with the sealing requirement of external heating type rotary kiln used in the pyrolysis and granulation process of superfine powder, the sealing requirement of external heating type rotary kiln is higher: first, the kiln needs to be in a micro negative pressure state for the discharge of kiln pyrolysis flue gas;Second, the kiln generally adopts external heating type, and the temperature in the kiln reaches 800 DEG C, and the material ignition point is low, so the oxygen content in the furnace needs to be strictly controlled, and oxygen leakage will lead to material ignition, affecting product yield and safety risk;Third, the density of superfine powder is small, and the particle size is small, so if the sealing is not strict, the material will leak, and the environment will be affected. INVENTION CONTENTS

[0004] The utility model discloses a multilayer sealing of large -scale external heating type rotary kiln, solve the technical problem that the sealing of the existing external heating type rotary kiln cylinder is not enough under the condition of heat.

[0005] The application discloses a multilayer sealing of large -scale external heating type rotary kiln, which comprises:

[0006] A cylinder body;

[0007] A kiln end cover is sleeved on the cylinder body;

[0008] A partition plate is installed on the inner wall of the kiln end cover;

[0009] A sealing assembly is installed on the end of the kiln end cover, and the inner side of the sealing assembly is in contact with the outer wall of the cylinder body;

[0010] The sealing assembly comprises:

[0011] A packing seal is sleeved on the outer wall of the cylinder body, and one side of the packing seal is in contact with the partition plate;

[0012] A nitrogen seal is installed on the end of the kiln end cover, and the nitrogen seal is in contact with the other side of the packing seal.

[0013] The application is provided with a sealing assembly, which can realize dynamic sealing under the condition of heat, so as to ensure the quality of the product.

[0014] On the basis of the above technical scheme, the application can also be improved as follows:

[0015] Further, the packing seal is a square graphite packing, and the beneficial effect of the step is that the preliminary sealing can be achieved through the graphite packing.

[0016] Further, it further comprises:

[0017] The outer cover is sleeved outside the nitrogen seal, and the outer cover is connected with the end of the kiln end cover;

[0018] The fish scale seal is connected with the outer wall of the outer cover at one end and is in contact with the outer wall of the cylinder at the other end, and the beneficial effect of the step is that the further sealing can be achieved through the fish scale seal.

[0019] Further, the nitrogen seal comprises:

[0020] The sealing block is installed outside the cylinder;

[0021] The nitrogen seal cover is sleeved outside the sealing block, and the outer wall of the nitrogen seal cover is in contact with the outside of the packing seal, and the nitrogen seal cover is filled with nitrogen, and the beneficial effect of the step is that the sealing effect is ensured by filling the nitrogen seal cover with nitrogen.

[0022] Further, the sealing block is a graphite block, and the sealing block is a plurality of sealing blocks, which are arranged at intervals outside the cylinder, and the beneficial effect of the step is that the sealing and lubricating effects can be achieved through the plurality of graphite blocks.

[0023] Further, the nitrogen seal further comprises a plurality of pressing assemblies, the pressing assemblies are installed inside the nitrogen seal cover, and the pressing assemblies complete the pressing of the sealing blocks to make them in contact with the outer wall of the cylinder, and the beneficial effect of the step is that the stable assembly of the graphite blocks and the cylinder is ensured by the cooperation of the pressing assemblies and the graphite blocks.

[0024] Further, the pressing assembly comprises:

[0025] Two springs are arranged at intervals, and one end of the spring is connected with the inner wall of the nitrogen seal cover;

[0026] The steel wire rope is connected with the free end of the spring at both ends, and the steel wire rope is in contact with the outer wall of the sealing block, and the beneficial effect of the step is that the graphite block is pressed by the steel wire rope through the contraction of the spring, so that the close-fitting density of the graphite block and the outer wall of the cylinder is ensured.

[0027] One or more technical solutions provided in the application have at least the following technical effects or advantages:

[0028] 1. The application is provided with a sealing assembly, which contains multiple sealing structures inside, so that the cylinder can be sealed in hot state, avoiding the contact between the materials inside the cylinder and air, improving product quality and reducing safety risks.

[0029] 2. The application is provided with a nitrogen sealing element, which can avoid the contact between materials and oxygen even if sealing problems occur, thereby ensuring product quality.

[0030] 3. The application is provided with a cover, and negative pressure is formed in the cover by the air pump, so that even if sealing problems occur, the exhaust gas and dust in the cylinder are extracted by the air pump, reducing the risk of air leakage and dust escape. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0032] Figure 1 The structure diagram of the multilayer sealing of a large-scale external heating type rotary kiln according to the specific embodiments of the present application;

[0033] Figure 2 For Figure 1 The structure diagram of the local part A;

[0034] Figure 3 For Figure 1 The structure diagram of the pressing assembly part;

[0035] 1-cylinder; 2-kiln tail cover; 3-separator; 4-sealing assembly; 5-cover; 6-fish scale sealing element;

[0036] 401-coiled sealing element; 402-nitrogen sealing element; 403-sealing block; 404-nitrogen sealing cover;

[0037] 405-pressing assembly; 406-spring; 407-steel wire rope. DETAILED DESCRIPTION

[0038] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, but cannot limit the protection scope of the present application.

[0039] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present application should be understood as the usual meaning understood by the skilled person in the field to which the present application belongs.

[0040] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0041] To better understand the above technical solutions, the following will provide a detailed description of the technical solutions in conjunction with the accompanying drawings and specific embodiments. Example

[0042] like Figures 1-3 As shown in the figure, this embodiment discloses a multi-layer seal for a large externally heated rotary kiln. The connection between the kiln tail hood and the cylinder is designed. Due to the special heating environment of the cylinder, a multi-layer seal structure is required to ensure airtightness, effectively prevent materials from contacting oxygen, and ensure product quality.

[0043] like Figure 1 As shown, the specific structure of this embodiment includes:

[0044] Cylinder 1, which rotates under the influence of other power components;

[0045] The kiln tail cover 2 is fitted onto the cylinder 1. The kiln tail cover 2 is relatively fixed, while the cylinder 1 is rotating. Therefore, it is necessary to ensure a seal between the two and reduce air leakage in order to ensure product quality.

[0046] The baffle 3 is installed on the inner wall of the kiln tail hood 2. The baffle 3 is an annular plate used to cooperate with the subsequent sealing components to ensure sealing.

[0047] The sealing component 4 is installed at the end of the kiln tail hood 2, and the inner side of the sealing component 4 contacts and seals the outer wall of the cylinder 1. Since the cylinder 1 is in a heated state, the sealing component 4 needs to be designed to ensure the sealing performance.

[0048] Specifically, the sealing component 4 includes:

[0049] Packing seal 401 is fitted onto the outer wall of cylinder 1, and one side of packing seal 401 contacts partition 3, which is used to hold packing seal 401 in place to ensure a seal.

[0050] The nitrogen sealing element 402 is installed at the end of the kiln tail cover 2 and is in contact with the other side of the packing seal element 401. In the embodiment, the packing seal element 401 is inside the kiln tail cover, that is, the inner wall of the kiln tail cover 2 abuts against the outer wall of the packing seal element 401, so that the packing seal element 401 is more closely attached to the outer wall of the cylinder 1, thereby ensuring the sealing performance. When the cylinder 1 is heated and expands, the inner wall of the kiln tail cover 2 is more closely in contact with the nitrogen sealing element 402, thereby ensuring the sealing performance of the packing seal element 401. Meanwhile, the related components inside the nitrogen sealing element 402 in the embodiment can form a double-layer sealing.

[0051] Specifically, the packing seal element 401 is a square graphite packing, which can ensure the sealing performance.

[0052] In an embodiment, as shown in FIG. 1, the embodiment further includes: Figure 1 2

[0053] The outer cover 5 is sleeved outside the nitrogen sealing element 402 and is connected to the end of the kiln tail cover 2. Negative pressure is formed in the cover by the air blower, so that even if the sealing problem occurs, the exhaust gas and dust in the cylinder are extracted by the air blower, thereby reducing the risk of gas leakage and dust escape.

[0054] The fish scale sealing element 6 is connected to the outer wall of the outer cover 5 at one end and is in contact with the outer wall of the cylinder 1 at the other end. The outer cover 5 in the embodiment is used to connect the nitrogen sealing element 402 and is convenient for installing other components.

[0055] The embodiment can achieve four-layer sealing. The first layer of sealing is performed by the packing seal element 401, the second and third layers of sealing are performed by the nitrogen sealing element 402, and the fourth layer of sealing is performed by the fish scale sealing element 6. The outer cover 5 and the subsequent nitrogen sealing cover 404 in the embodiment can be formed by welding a plurality of connecting plates.

[0056] Specifically, the nitrogen sealing element 402 in the embodiment includes:

[0057] The sealing block 403 is installed outside the cylinder 1.

[0058] The nitrogen sealing cover 404 is sleeved outside the sealing block 403, and the outer wall of the nitrogen sealing cover 404 is in contact with the outside of the packing seal element 401. The nitrogen sealing cover 404 is filled with nitrogen. The sealing block 403 in the embodiment can not only play a sealing role but also ensure lubricity and stable rotation of the cylinder 1.

[0059] In order to ensure the sealing effect, the sealing block 403 is a graphite block, and a plurality of sealing blocks 403 are arranged at intervals outside the cylinder 1, which can ensure the sealing performance and is convenient for assembly.

[0060] ​​In order to ensure the stability of the assembly of the sealing block 403, the nitrogen sealing element 402 further comprises a plurality of pressing assemblies 405, which are installed inside the nitrogen sealing cover 404 and complete the pressing of the sealing block 403 to make it in contact with the outer wall of the cylinder 1, so as to ensure the pressing of the sealing block 403 and make it more closely attached to the outer side of the cylinder 1.

[0061] The pressing assembly 405 comprises:

[0062] Two springs 406 are arranged at intervals, and one end of each spring 406 is connected to the inner wall of the nitrogen sealing cover 404.

[0063] A steel wire rope 407 is connected to the free end of each spring 406 at both ends, and the steel wire rope 407 is in contact with the outer wall of the sealing block 403. In the present embodiment, each pressing assembly 405 is composed of two interval springs and a steel wire rope, which can better press the sealing block and ensure the sealing effect.

[0064] Further description is made with respect to the present embodiment. The present embodiment is a rotary device, in which the cylinder 1 rotates and expands when heated. Therefore, a plurality of layers of seals are provided to ensure the sealing effect.

[0065] Specifically, the first layer of seal is a packing seal (graphite packing), which has a certain shrinkage and is installed in the middle of the joint gap in a cold state. When the cylinder device expands due to heating, the packing will be pressed to play a sealing role. The graphite packing has the properties of temperature resistance and wear resistance.

[0066] The second layer of seal is a sealing block (graphite block), which is processed into an arched block. The inner arch surface is attached to the arc surface of the expanded cylinder, and the outer arch surface is provided with a groove for placing a steel wire rope. The steel wire rope is used to tighten the graphite blocks, so that the graphite blocks are closely attached to the cylinder. When the cylinder operates, the graphite blocks are attached to the cylinder to form a sealing surface. When the graphite blocks are worn, the steel wire rope is automatically tightened to keep the graphite blocks attached to the cylinder.

[0067] The third layer of seal is a nitrogen seal. A nitrogen sealing cover is added on the upper part of the graphite block, and nitrogen is introduced to maintain a certain pressure. Even if there is a small amount of leakage in the first, second and third seals, the nitrogen will be input into the kiln from the outside, and the nitrogen is an inert gas that will not ignite the material, thereby reducing the possibility of oxygen leakage.

[0068] The fourth layer of seal is a fish scale seal, which is a safeguard measure. If there is leakage in the first, second and third seals, the amount of air intake can be reduced. At the same time, the fish scale is combined with a dust collection cover, which collects the leaked powder under negative pressure to reduce the pollution of the powder to the environment. At the same time, the air in the sealing position is also sucked out to reduce the possibility of air entering the kiln.

[0069] The technical solution of the present application is also applicable to the connection position of the kiln head cover and the cylinder.

[0070] In the description of the present application, a large number of specific details are explained. However, it can be understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure the understanding of this description.

[0071] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0072] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application.

Claims

1. A multi-layer seal for a large externally heated rotary kiln, characterized in that, include: Cylinder (1); The kiln end cover (2) is fitted onto the cylinder (1); A partition (3) is installed on the inner wall of the kiln end cover (2); A sealing assembly (4) is installed at the end of the kiln end cover (2), and the inner side of the sealing assembly (4) is in contact with and sealed to the outer wall of the cylinder (1); The sealing assembly (4) includes: Packing seal (401) is fitted onto the outer wall of the cylinder (1), and one side of the packing seal (401) is in contact with the partition (3); Nitrogen sealing element (402) is installed at the end of the kiln end cover (2), and the nitrogen sealing element (402) is in contact with the other side of the packing seal (401); The nitrogen-sealed sealant (402) includes: A sealing block (403) is installed on the outside of the cylinder (1); A nitrogen sealing cover (404) is fitted onto the outside of the sealing block (403), and the outer wall of the nitrogen sealing cover (404) contacts the outer side of the packing seal (401). The nitrogen sealing cover (404) is filled with nitrogen gas. The sealing block (403) is a graphite block, and there are multiple sealing blocks (403), which are spaced apart on the outside of the cylinder (1); The nitrogen sealing element (402) also includes a plurality of clamping components (405), which are installed inside the nitrogen sealing cover (404) and the clamping components (405) clamp the sealing block (403) so that it contacts the outer wall of the cylinder (1); The clamping assembly (405) includes: Two springs (406) are spaced apart, and one end of each spring (406) is connected to the inner wall of the nitrogen sealing cover (404). The wire rope (407) is connected at both ends to the free ends of the spring (406), and the wire rope (407) is in contact with the outer wall of the sealing block (403).

2. The multilayer seal according to claim 1, characterized in that, The packing seal (401) is a square graphite packing.

3. The multi-layer seal according to claim 1, characterized in that, It also includes: The outer cover (5) is fitted onto the outside of the nitrogen sealing element (402), and the outer cover (5) is connected to the end of the kiln end cover (2); Fish scale seal (6), one end of which is connected to the outer wall of the outer cover (5), and the other end is in contact with and sealed to the outer wall of the cylinder (1).

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