CN203703126U - Sealing device for air duct of rotary kiln and porous rotary kiln equipped therewith - Google Patents

Abstract

The utility model discloses a rotary kiln air duct sealing device, which is used for relative sealing between the air duct groove body and the cover body forming the air duct. The sealing device includes two sets of seals and sealing ring plates that are radially matched, wherein the seals are respectively arranged on both sides of the cover, and each side seal includes an inner seal close to the inside of the cover and a seal away from the cover. The outer seal inside the cover body; the sealing ring plates are fixedly arranged on both sides of the air duct groove body, and the sealing ring plates on each side are arranged coaxially with the cylinder body of the rotary kiln. Through the above arrangement, the sealing device can be adapted to the axial and radial movements of the rotary kiln, ensuring the service life of the sealing device and the reliability of the air duct seal. On this basis, the utility model also provides a porous rotary kiln with the sealing device.

Description

Rotary kiln air duct sealing device and porous rotary kiln with the sealing device

technical field

The utility model relates to the technical field of a rotary kiln, in particular to a sealing device for an air duct of a rotary kiln. In addition, the utility model also relates to a porous rotary kiln with the sealing device.

Background technique

At present, rotary kilns are widely used in many production industries such as building materials, metallurgy, chemical industry, mining and environmental protection. Through mechanical, physical or chemical treatment of solid materials, they can provide the required materials for various industries. The rotary kiln has become the core production equipment in the industrial field. Among them, the porous rotary kiln has the characteristics of high thermal efficiency, small footprint, and convenient operation, and has been widely used in the above industries.

The current multi-hole rotary kiln is a rotary cylinder structure, and the kiln body is evenly equipped with air inlets. By controlling the air volume of these air inlets, the atmosphere in the multi-hole rotary kiln can be adjusted, and then the roasting temperature and chemical reaction can be precisely controlled. Therefore, there is a higher requirement for the sealing performance of the multi-hole rotary kiln air duct, which also promotes the development and research on the sealing reliability of the multi-hole rotary kiln air duct.

In the prior art, referring to Fig. 1 and Fig. 2 together, one end of the sealing device 011 (that is, the rubber seal in the figure) is fixed to the air channel groove body 012, and the other end abuts against the side plate of the cover body 013 and moves relatively. During the working process of the porous rotary kiln, due to the constraints of the working conditions, this sealing method has the following technical problems:

First, affected by the working characteristics of the porous rotary kiln and the thermal working environment, during the operation, the porous rotary kiln generates movement and thermal expansion along the axis of the kiln body, so the sealing device 011 is greatly reduced Therefore, it is easy to cause a gap between the cover body 013 and the air duct groove body 012, and the phenomenon of air leakage in the air duct 01 occurs, which seriously reduces the working performance of the porous rotary kiln.

Second, during the operation of the multi-hole rotary kiln, there is a large amount of radial movement along the radial direction of the cylinder body 02, which is limited by the structure between the cover body 013 and the air duct groove body 012. When movement occurs The length of the side plate of the cover body 013 cannot satisfy the sufficient contact between the rubber seal and the cover body 013, and the phenomenon that the rubber seal is separated from the side plate of the cover body occurs. Therefore, the sealing performance of this sealing method is low, and it is easy to cause Air duct 01 leaks air.

Third, due to the large sum of axial movement and thermal expansion of the porous rotary kiln, the rubber seals are repeatedly bent by a large margin. Under high-strength working conditions, the breakage rate of rubber seals is relatively high. High, if it is not replaced in time, it will easily lead to serious air leakage of the porous rotary kiln, greatly reducing production efficiency, and at the same time, increasing the maintenance workload and production costs.

In view of the above problems, it is urgent to improve the sealing device of the multi-hole rotary kiln air duct system, and provide the rotary kiln with a sealing device suitable for the working conditions of axial movement, axial thermal expansion and radial offset movement, and greatly improve the sealing reliability and the service life of the sealing device.

Utility model content

Based on the defects in the prior art, the technical problem to be solved by the utility model is to provide a rotary kiln air duct sealing device to solve the working conditions of the rotary kiln in the axial movement, axial thermal expansion and radial deviation The problem of air leakage in the lower air duct can effectively improve the sealing reliability of the air duct and the service life of the sealing device. On this basis, the utility model also provides a porous rotary kiln with the sealing device.

The rotary kiln air duct sealing device provided by the utility model is used to form the relative sealing between the air duct groove body and the cover body of the air duct. A ring plate, wherein the seals are respectively arranged on both sides of the cover, and the seals on each side include an inner layer seal close to the inside of the cover and an outer layer far away from the inside of the cover Sealing element: the sealing ring plates are respectively fixedly arranged on both sides of the air channel groove body, and the sealing ring plates on each side are arranged coaxially with the cylinder body of the rotary kiln.

Preferably, the sealing device further includes a radial adjustment mechanism corresponding to the seal, and each side of the radial adjustment mechanism includes a sliding part that is slidably fitted and a guide part that is fixed to the cover, so that One end of the sliding part is inserted into the guiding part of the groove structure, so that the sliding part moves radially relative to the guiding part, and the inner layer seal is fixed to the corresponding sliding part.

Preferably, the outer seals are fixed to the corresponding sliding parts.

Preferably, the outer sealing element is fixed to the corresponding guide portion.

Preferably, the inner layer seal is provided with a sealing body abutting against the outer peripheral surface of the sealing ring plate and a housing part for accommodating the sealing body, and the opening end of the housing part is in contact with the sealing ring The gap between the outer peripheral surfaces of the plates is smaller than the radial offset of the rotary kiln shell.

Preferably, in an initial state, the radial distance between the groove bottom of the guide part and the embedded end of the sliding part is greater than the radial offset of the rotary kiln shell.

Preferably, the guide part is provided with an elastic element, and two ends of the elastic element abut against the groove bottom of the guide part and the embedded end of the sliding part respectively.

Preferably, the elastic element is pre-compressed and deformed so that the sealing member adheres to the outer peripheral surface of the sealing ring plate.

Preferably, the guide part may be formed by the side plate of the cover body and a bent plate fixed to the side plate of the cover body.

Preferably, the sealing ring plates on each side have displacement sections that can be moved by the corresponding seals in opposite directions of axial movement of the barrel, and the length of the displacement sections on each side is greater than that of the The sum of the axial displacement and axial thermal expansion of the rotary kiln shell.

Preferably, in an initial state, the seals on each side respectively abut against the starting ends of the corresponding sealing ring plates close to the axial movement direction of the rotary kiln.

The utility model also provides a porous rotary kiln, which includes a cylinder body and an air channel for delivering pressured air to the cylinder body, and the sealing device for the air channel is the above-mentioned sealing device.

Compared with the prior art, the rotary kiln air duct sealing device provided by the utility model can effectively solve the problems of air duct leakage in the rotary kiln under the conditions of axial movement, axial thermal expansion and radial deviation, and significantly improve Seal reliability and continuity of rotary kiln. Specifically, the sealing device includes two sets of seals and sealing ring plates that are radially offset and adapted, wherein the seals are respectively arranged on both sides of the cover, and each side seal includes an inner seal close to the inside of the cover. The first layer seal and the outer seal away from the inside of the cover body; for the sealing ring plates, they are fixedly arranged on both sides of the air duct groove body, and the sealing ring plates on each side are coaxially arranged with the cylinder of the rotary kiln. That is to say, the sealing ring plate and the air duct groove rotate with the cylinder of the rotary kiln, and the double-layer seals arranged on both sides of the cover are in contact with the outer peripheral surface of the sealing ring plate, and produce relative rotation in the circumferential direction. , the double-layer seal can also move axially relative to the outer peripheral surface of the seal ring plate. Obviously, such setting can effectively solve the problem of low continuity of the radial seal between the air channel groove body and the cover body, and can effectively solve the problem that the seal is greatly squeezed when the rotary kiln moves in the axial direction and expands thermally. The phenomenon of serious breakage, and the problem of low sealing reliability between the air duct tank and the cover body, at the same time, the inner layer seal and the outer layer seal form a double seal protection to avoid easy air leakage of the rotary kiln under the single layer seal phenomenon, thus providing a reliable guarantee for the stable and efficient operation of the rotary kiln.

In the preferred solution of the present utility model, the sealing device also includes a radial adjustment mechanism corresponding to the seal, and the radial adjustment mechanism on each side includes a sliding part and a guide part fixed to the cover body, and the sliding part and the guide Specifically, one end of the sliding part is inserted into the guiding part of the groove structure, so that the sliding part can move radially relative to the guiding part, and at the same time, the inner seal is fixed to the corresponding sliding part. During the actual operation of the rotary kiln, the rotary kiln cylinder drives the air channel groove body to produce radial movement. Since the inner layer seal is in contact with the sealing ring plate fixed on the air channel groove body, radial deviation will also occur , through the above-mentioned radial adjustment mechanism, it can effectively absorb the impact of the radial deviation of the rotary kiln on the inner seal, improve the service life of the inner seal, and further improve the resistance of the inner seal to the radial deviation of the rotary kiln. adaptability.

In another preferred solution of the present utility model, the outer seal is fixed to the corresponding sliding part, that is to say, the outer seal can also absorb the rotary kiln through the radial movement of the sliding part in the radial adjustment mechanism. The radial impact generated by the radial offset prevents the outer seal from being damaged by large extrusion deformation, effectively reducing the replacement frequency and maintenance cost of the outer seal.

In yet another preferred solution of the present utility model, the inner layer seal is provided with a sealing body that abuts against the outer peripheral surface of the sealing ring plate and an accommodation portion for accommodating the sealing body, and the opening end of the accommodation portion is in contact with the sealing ring plate The gap between the outer peripheral surfaces of the rotary kiln is less than the radial offset of the rotary kiln shell, that is to say, the inner seal includes a sealing body and a receiving part that enhances the rigidity of the sealing body, and the sealing body extends out the length of the receiving part Less than the radial offset of the rotary kiln shell. Such arrangement can improve the sealing effect of the inner seal by increasing the contact area between the sealing body and the sealing ring plate, and can make the receiving part adapt to the radial offset of the cylinder under the radial action of the sealing body .

Description of drawings

Fig. 1 is the structural representation of the air duct in the prior art;

Fig. 2 is the schematic diagram of the structure of the connection between the air duct shown in Fig. 1 and the porous rotary kiln shell;

Fig. 3 is an axial schematic diagram of the porous rotary kiln described in the first embodiment;

Fig. 4 is A-A sectional view among Fig. 3;

Fig. 5 is a partially enlarged schematic diagram at I place in Fig. 4;

Fig. 6 is a schematic diagram of direction J in Fig. 5;

Fig. 7 is a structural schematic diagram of the connection between the air duct shown in Fig. 3 and the porous rotary kiln shell;

Fig. 8 is a schematic diagram of sealing assembly of the sealing device of the porous rotary kiln in the second embodiment.

In Figure 1 and Figure 2:

Air duct 01, cylinder body 02, sealing device 011, air duct groove body 012, cover body 013.

In Figure 3 to Figure 8:

Sealing device 1, cover body 2, air duct groove body 3, cylinder body 4, distribution air duct 5;

Seal 11, sealing ring plate 12, radial adjustment mechanism 13, cover body side plate 21, air duct groove body side plate 31, pressure air outlet 32;

Outer seal 111, inner seal 112, guide part 131, sliding part 132, elastic element 133, seal body 1121, accommodating part 1122, bent plate 1311;

Axial displacement section S1, radial displacement section S2, clearance B, radial distance C, axial movement direction D.

Detailed ways

Based on the problems existing in the sealing device of the rotary kiln air duct provided by the prior art, the utility model finds another way. , The sealing device for the air duct leakage problem under the condition of axial thermal expansion and radial offset, thus effectively improving the sealing reliability of the air duct and the service life of the sealing device, and significantly improving the working performance of the rotary kiln. In addition, another core of the present invention is to provide a porous rotary kiln with the sealing device.

In order to enable operators in the technical field to better understand the solution of the utility model, the utility model will be further described in detail below in conjunction with the accompanying drawings.

Example 1:

Please refer to Fig. 3 to Fig. 6, wherein Fig. 3 is an axial schematic diagram of the porous rotary kiln described in the first embodiment; Fig. 4 is a cross-sectional view of A-A in Fig. 3; Fig. 5 is a partially enlarged schematic diagram of I in Fig. 4; Fig. 6 is Schematic diagram of direction J in Figure 5.

As shown in Figure 3 and Figure 4, in order to effectively avoid the limitation of the gap structure between the air duct groove body 3 and the cover body 2 in the radial direction, in this scheme, the rotary kiln air duct sealing device 1 includes two sets of radially offset fittings. Matched seal 11 and sealing ring plate 12. Wherein, the seals 11 are arranged on both sides of the cover body 2 respectively, and each side seal 11 has a double sealing structure, that is, each side seal 11 includes an inner layer seal 112 close to the inside of the cover body 2 and The outer seal 111 away from the inside of the cover body 2, in the actual working process, when one of the seals 11 fails, the other seal 11 can independently and reliably seal the air duct of the rotary kiln to ensure sufficient air volume into the rotary kiln cylinder 4; the sealing ring plates 12 are respectively fixed on both sides of the air channel tank 3, and the sealing ring plates 12 on each side are coaxially arranged with the cylinder 4 of the rotary kiln. That is to say, the sealing ring plate 12 and the air channel groove body 3 rotate with the cylinder body 4 of the rotary kiln, and the double-layer sealing members 11 arranged on both sides of the stationary cover body 2 are in contact with the outer peripheral surface of the sealing ring plate 12 , to generate relative rotation in the circumferential direction, and at the same time, the seals 11 on each side can move axially on the outer peripheral surface of the corresponding sealing ring plate 12 respectively.

Apparently, compared with the prior art, the sealing device 1 in this embodiment greatly improves the reliability of radial sealing between the air channel groove body 3 and the cover body 2, and effectively solves the problem that the rotary kiln body 4 can move in the axial direction. Under dynamic and thermal expansion conditions, the continuous sealing performance of the air duct is poor. At the same time, it eliminates the phenomenon that the seal 11 is severely damaged by axial large-scale extrusion, improves the service life of the sealing device 1, and stabilizes the rotary kiln. Efficient operation provides reliable guarantee.

It should be noted that, in the working state of the rotary kiln, two-way movement and thermal expansion will occur along the 4-axis direction of the cylinder, but in practical engineering applications, generally one side of the rotary kiln is restricted so that the rotary kiln Movement occurs in a single axial direction. Therefore, the axial movement direction D is used for illustration and description in this paper, which does not limit the technical solution claimed in this application.

In order to further describe the technical solution claimed in this application, please refer to Figure 4 and Figure 5. In this solution, preferably, the outer seal 111 is set as a rubber seal, and the outer seal 111 can be fully utilized The flexible nature of the rubber absorbs the radial offset generated during the rotation of the rotary kiln shell 4 .

As shown in Figure 4, the sealing ring plate 12 is fixedly arranged on the outer edge of the end surface of the side plate 31 of the air duct groove body, and is arranged coaxially with the rotary kiln shell 4, so that the manufacturability of the sealing device 1 is further optimized, and It is convenient to cooperate with the corresponding seal 11 to install. In addition, the sealing ring plate 12 and the air channel groove body 3 can be fixed by welding, and the installation and fixing process is simple and easy to operate. During the manufacturing and installation process, the cylindricity and flatness of the outer peripheral surface of the sealing ring plate 12 should be ensured so as to reduce the friction between the rubber seal and the sealing ring plate 12 .

It should be noted that, for the air channel tank body 3, the outer edge of its end face is the edge away from the central axis of the rotary kiln shell 4, and the use of "outer edge" in this paper to express the positional relationship of the corresponding components does not claim protection of the technology in this application. Program constitutes a limitation.

At the same time, the sealing device 1 is also provided with a radial adjustment mechanism 13 corresponding to the seal 11 , and each side of the radial adjustment mechanism 13 includes a sliding part 132 for sliding fit and a guide part 131 fixed to the cover body 2 . It can be seen from the figure that the guide part 131 is formed by the side plate 21 of the cover body and the bent plate 1311 fixed on the side plate 21 of the cover body, and a hole for one end of the sliding part 132 to be embedded is formed between the side plate 21 of the cover body and the bent plate 1311. The space is such that the sliding part 132 can move radially relative to the guiding part 131, that is to say, the bent plate 1311 can be fixed to the side plate 21 of the cover body by welding, and the two are connected to form a groove body matched with the sliding part 132. The sliding part 132 can be inserted into the groove of the guiding part 131 to move in the radial direction, and the guiding part 131 can limit the axial deviation of the sliding part 132 to play the role of axial fixing.

At the same time, the inner layer seal 112 is connected with the corresponding sliding part 132. When the rotary kiln rotates, the inner layer seal 112 moves radially with the rotary kiln shell 4 driven by the air channel groove body 3, and pushes the sliding The part 132 moves radially in the guide part 131. Obviously, the radial adjustment mechanism 13 can effectively eliminate the impact of the radial deviation of the rotary kiln on the inner seal 112, effectively improve the service life of the inner seal 112, and further significantly improve The adaptability of the inner layer seal 112 to the radial offset movement of the rotary kiln ensures the efficient and stable working state of the rotary kiln.

Similarly, the rubber seals can be fixed to the corresponding sliding parts 132, that is to say, the rubber seals can also absorb the radial displacement of the rotary kiln through the radial movement of the sliding parts 132 in the radial adjustment mechanism 13. Radial impact further prevents rubber seals from being damaged by large extrusion deformation, effectively reducing the replacement frequency and maintenance cost of rubber seals.

Further, the inner sealing member 112 is provided with a sealing body 1121 abutting against the outer peripheral surface of the sealing ring plate 12 and an accommodating portion 1122 for accommodating the sealing body 1121 , and the sealing body 1121 of the inner sealing member 112 is set as The asbestos material is used to increase the sealing contact area between the inner seal 112 and the sealing ring plate 12 . In actual application, the housing part 1122 is filled with asbestos material, and the length of the asbestos material protruding from the port of the housing part 1122 is half of the radial offset of the rotary kiln shell 4, that is to say, in the initial state, that is, the rotary kiln In the state where there is no axial and radial movement in the non-working state, the gap B between the opening end of the accommodation part 1122 and the outer peripheral surface of the sealing ring plate 12 is set to be the radial offset of the rotary kiln shell 4 half. Apparently, it is possible to effectively avoid the interference between the receiving part 1122 and the sealing ring plate 12, and it is beneficial for the receiving part 1122 to serve as the skeleton of the fixed sealing body 1121, which plays a role in increasing its strength. At the same time, the gap B is smaller than that of the rotary kiln barrel The radial offset of the body 4 can provide a reliable guarantee for the accommodating part 1122 to fully strengthen the strength of the sealing body 1121, thereby ensuring the sealing reliability of the inner seal 112 and improving the relative strength of the inner seal 112 to the rotary kiln shell. 4 Adaptability to radial offset.

In order to make the seal 11 better adapt to the radial offset movement of the rotary kiln shell 4 and effectively improve the service life of the seal 11 , the design of the radial adjustment structure of the guide part 131 can be further improved. As shown in Figure 5, in the initial state, the radial distance C between the groove bottom of the guide part 131 and the embedded end of the sliding part 132 is twice the radial offset of the rotary kiln shell 4, so that the When the seal 11 deviates with the rotary kiln shell 4 in the radial direction, it has enough radial movement space, which effectively eliminates the rigid interference between the seal 11 and the seal ring plate 12, and significantly improves the sealing device 1 to the rotary kiln. The adaptability of producing radial offset movement under the working condition of cylinder body 4.

In addition, the structure of the guide portion 131 can be further optimized to improve the adaptability of the sealing device 1 to the radial offset movement of the rotary kiln shell 4 . As shown in Figures 5 and 6, the guide part 131 is provided with an elastic element 133, and the two ends of the elastic element 133 are respectively abutted against the groove bottom of the guide part 131 and the embedded end of the sliding part 132, that is to say, when the rotary kiln is running When working, the seal 11 radially pushes the sliding part 132 to move radially inside the guide part 131, and the embedded end of the sliding part 132 is buffered by the elastic element 133, which can effectively eliminate the stamping damage of the sliding part 132, so that the sealing part 11 has Better adaptability to radial movement.

In the initial state, the elastic element 133 is pre-compressed and deformed so that the seal 11 fits the outer peripheral surface of the sealing ring plate 12, and the elastic element 133 is set so that it can absorb twice the pressure generated during the rotation of the rotary kiln shell 4. The radial offset here has the same effect as the setting of the radial distance C between the bottom of the groove and the embedded end of the sliding part 132. In addition, it can also improve the effective adhesion between the sealing member 11 and the outer peripheral surface of the sealing ring plate 12. Combined, to further ensure the reliable sealing of the rotary kiln air duct.

It should be noted that the elastic element 133 is a type of member that has a buffering effect and can effectively absorb compression deformation. The elastic element 133 herein can be set as a helical spring, a pressure plate spring or elastic rubber, etc., which can achieve elasticity. Any member of the function of the element 133 may be used.

In addition, the sealing ring plate 12 in the sealing device 1 also has an axial displacement section S1. Referring to FIG. 4 and FIG. Axial displacement segment S1 that moves in the opposite direction of play. In this scheme, the length of the axial displacement section S1 on each side is 1.5 times the sum of the axial movement and axial thermal expansion of the rotary kiln shell 4, and, in the initial state, the seals 11 on each side respectively resist Connect to the start end of the corresponding sealing ring plate 12 close to the axial movement direction D of the rotary kiln, that is to say, the inner seal 112 or outer seal 111 on each side away from the axial movement direction D of the rotary kiln is respectively connected to the corresponding shaft To the beginning of the displacement section S1, as shown in Figure 4, the outer seal 111 abuts against the beginning of the axial displacement section S1 of the side seal ring plate 12, and as shown in Figure 5, the inner seal 112 abuts the side seal The starting end of the axial displacement section S1 of the ring plate 12 . Obviously, with this setting, the length of the axial displacement section S1 on each side can meet the continuous and reliable sealing of the sealing device 1 in the working condition of the rotary kiln, and when the sealing element moves axially relative to the outer peripheral surface of the sealing ring plate 12, it can always be consistent with The outer peripheral surface of the sealing ring plate 12 is kept in close contact, which improves the reliable and continuous sealing performance of the air duct to a greater extent, and provides a guarantee for the efficient and stable operation of the rotary kiln.

In addition, the pre-compressed deformation of the rubber seal is bent to the inside of the cover body 2, that is to say, the bending section of each sealing rubber is bent to the inside of the cover body 2, so as to improve the manufacturability of installation.

On this basis, the side plates 31 of the air duct body are provided with pressure air outlets 32 connected to the distribution duct 5 of the rotary kiln respectively, that is to say, the air duct body 3 is arranged in a symmetrical structure, as shown in FIG. 7 . The flexibility of installation and operation of the air duct body 3 is improved, and the air volume entering the rotary kiln shell 4 can be better controlled to improve the working performance of the rotary kiln.

In order to facilitate a clear understanding of the technical solution of this application, the relevant concepts and settings in this article are explained, as follows:

In this embodiment, the definitions of the radial direction and the axial direction are determined according to the rotary kiln shell 4, that is, the direction of the central axis of the rotary kiln shell 4 is the above-mentioned axial direction, and the diameter direction of the rotary kiln shell 4 is The above-mentioned radial direction, the two orientations of "radial and axial" used in this article are used to distinguish the movement direction and position setting orientation of the components, and do not limit the technical solution claimed in this application.

In this embodiment, the configuration of the guide part 131 is not limited to being formed by the side plate 21 of the cover body and the bent plate 1311 fixed to the side plate 21 of the cover body, but also can be provided on the side plate 21 of the cover body for the sliding part 132 to embed. Therefore, the groove body forms an integral guide part 131 , and the structure of this design and the cooperation with the sliding part 132 can refer to the above-mentioned solution.

In this embodiment, the sealing material is a kind of material with a certain flexibility and a small friction coefficient. Therefore, the sealing material used in the inner seal 112 and the outer seal 111 is not limited to this, and other materials can also be selected. For example, the material of the inner sealing member 112 can also be rubber or vinyl, and the setting of the sealing material only needs to satisfy the sealing function of the sealing member 11 .

In this embodiment, the gap B between the opening end of the receiving portion 1122 and the outer peripheral surface of the sealing ring plate 12 can also be other values within the range of the radial offset of the rotary kiln shell 4, and is not limited to setting It is half of the radial offset of the rotary kiln shell 4, as long as the opening end of the receiving portion 1122 does not interfere with the sealing ring plate 12, and the gap B can enhance the strength of the sealing body 1121.

In this embodiment, the radial distance C between the groove bottom of the guide part 131 and the embedded end of the sliding part 132 can also be other values greater than the radial offset of the rotary kiln shell 4, and it is not limited to be set as a rotary twice of the radial offset of the kiln shell 4; similarly, the adjustment range of the elastic element 133 to the radial offset is not limited to being twice the radial offset of the rotary kiln shell 4, the above two The setting of the two values only needs to be able to fully realize the adjustment function of the radial adjustment mechanism 13 on the radial movement of the sealing member 11 .

Similarly, in this embodiment, the length of the axial displacement section S1 on each side is not limited to be set to 1.5 times the sum of the axial displacement and axial thermal expansion, and it is only necessary to make the length of the axial displacement section S1 on each side equal greater than the sum of the axial displacement and axial thermal expansion of the rotary kiln shell 4 to ensure that the sealing device 1 adapts to the movement in the axial direction of the rotary kiln and provides continuous and reliable sealing.

The fixing position of the outer seal 111 can not only be fixedly connected with the above-mentioned sliding part 132 , but also can be fixed at other positions. The fixing position of the outer seal 111 is improved in the second embodiment described below.

Example 2:

Please refer to Fig. 8, which is a schematic diagram of sealing assembly of the sealing device of the porous rotary kiln in the second embodiment. In order to clearly show the difference between this solution and the first embodiment, components and structures with the same function are marked with the same reference numerals.

Compared with the first embodiment, the composition of the main body and the connection position of other components in this embodiment are exactly the same. guide part 131 .

Specifically, as shown in Figure 8, the rubber seals on each side are respectively fixed on the corresponding stationary guide parts 131, so that the adaptability of the seals 11 to the radial deviation of the rotary kiln shell 4 can be more effectively improved , especially the properties of asbestos materials and rubber seals can be used to flexibly design the structure and fixed position.

At the same time, the length of the radial displacement section S2 between the outer peripheral surface of the sealing ring plate 12 and the inner edge of the curved plate 1311 connecting the rubber seal to the guide part 131 is twice the radial displacement of the rotary kiln. In the actual working state of the rotary kiln, its radial offset is generally between a dozen to tens of millimeters. In this way, the setting of the above radial displacement section S2 can fully satisfy the use of rubber seals within a reasonable deformation range, and effectively avoid It prevents the sealing rubber from being subjected to repeated large-scale bending deformation, thereby reducing the phenomenon of air leakage caused by damage to the sealing rubber during the working process of the rotary kiln.

Of course, the radial displacement section S2 between the outer peripheral surface of the above-mentioned sealing ring plate 12 and the inner edge of the curved plate 1311 connected to the rubber seal of the guide part 131 can also be greater than twice the radial offset of the rotary kiln shell 4, It is not limited to twice the radial offset of the rotary kiln shell 4, it only needs to meet the effective abutment between the rubber seal and the sealing ring plate 12 to fit under the sealing air duct, and reduce the average bending deformation range of the rubber seal. Can.

It should be noted that the inner edge of the curved plate 1311 is the edge close to the central axis of the rotary kiln shell 4, and the "inner edge" is used in this paper to clearly express the relationship between the corresponding components, and does not constitute a limit to the technical solution claimed in this application .

In addition to the above rotary kiln air duct sealing device 1, the utility model also provides a porous rotary kiln, the porous rotary kiln includes a cylinder 4 and an air duct for delivering pressure air to the cylinder 4, the porous rotary kiln has the above sealing device 1. Wherein, for the structure of other parts of the porous rotary kiln, please refer to the prior art, which will not be repeated here.

In particular, here, the sealing member 11 and the radial adjustment mechanism 13 are arranged on both sides of the cover body 2, and the sealing ring plate 12 is fixedly arranged on both sides of the air channel groove body 3, so that the sealing device 1 can adapt to the rotation The axial and radial movement of the kiln shell 4 ensures its effective and reliable sealing performance. Of course, based on the symmetry characteristics of the structure and movement of the rotary kiln, the seal 11 and the radial adjustment mechanism 13 can also be arranged on both sides of the air channel groove body 3, and the sealing ring plate 12 is arranged on both sides of the cover body 2, The functions of the sealing device 1 described herein can also be realized, and its specific structure and design principles can be found in the above description, which will not be repeated here.

The sealing device for the air duct of the rotary kiln provided by the utility model and the porous rotary kiln provided with the sealing device have been introduced above in detail. This article only elaborates on specific examples of the present invention, and the descriptions of the above specific embodiments are only used to help understand the method and core idea of the present invention. It should be pointed out that those skilled in the art can make some improvements and modifications without departing from the features of the utility model, and these improvements and modifications should also be regarded as the protection scope of the utility model.

Claims (12)

1. A rotary kiln air duct sealing device, which is used to form a relative seal between the air duct groove body and the cover body of the air duct, characterized in that the sealing device includes two sets of radially offset and adapted seals and a seal ring plate, wherein the seals are respectively arranged on both sides of the cover, and the seals on each side include an inner layer seal close to the inside of the cover and a seal away from the inside of the cover. The outer layer seals; the sealing ring plates are fixedly arranged on both sides of the air duct groove body, and the sealing ring plates on each side are arranged coaxially with the cylinder body of the rotary kiln. 2. The rotary kiln air duct sealing device according to claim 1, characterized in that, the sealing device also includes a radial adjustment mechanism corresponding to the sealing member, and the radial adjustment mechanism on each side includes a sliding An adapted sliding part and a guiding part fixed on the cover, one end of the sliding part is inserted into the guiding part of the groove structure so that the sliding part can move radially relative to the guiding part, and the inner layer The seals are fixed to the corresponding sliding parts. 3. The sealing device for the air duct of the rotary kiln according to claim 2, characterized in that, the outer sealing member is fixed to the corresponding sliding part. 4. The sealing device for the air duct of the rotary kiln according to claim 2, characterized in that, the outer sealing member is fixed to the corresponding guide part. 5. The rotary kiln air duct sealing device according to any one of claims 2 to 4, characterized in that, the inner layer seal is provided with a sealing body that abuts against the outer peripheral surface of the sealing ring plate and a housing portion for housing the sealing body, the gap between the opening end of the housing portion and the outer peripheral surface of the sealing ring plate is smaller than the radial offset of the rotary kiln shell. 6. The rotary kiln air duct sealing device according to claim 5, characterized in that, in the initial state, the radial distance between the groove bottom of the guide part and the embedded end of the sliding part is greater than that of the rotary kiln The radial offset of the barrel. 7. The rotary kiln air duct sealing device according to claim 6, characterized in that the guide part is provided with an elastic element, and the two ends of the elastic element abut against the groove bottom of the guide part and the sliding part respectively the embedded side. 8 . The sealing device for the air duct of the rotary kiln according to claim 7 , wherein the elastic element is pre-pressed and deformed so that the sealing member is attached to the outer peripheral surface of the sealing ring plate. 9 . 9 . The sealing device for the air duct of the rotary kiln according to claim 8 , wherein the guide part can be formed by the side plate of the cover body and a bent plate fixed to the side plate of the cover body. 10 . 10. The sealing device for the air duct of a rotary kiln according to claim 9, wherein the sealing ring plates on each side have respective rings that allow the corresponding sealing members to move in opposite directions along the axial direction of the cylinder. The displacement section, and the length of the displacement section on each side is greater than the sum of the axial displacement and axial thermal expansion of the rotary kiln shell. 11. The sealing device for the air duct of the rotary kiln according to claim 10, characterized in that, in the initial state, the sealing members on each side are respectively abutted against the axial movement direction of the corresponding sealing ring plate close to the rotary kiln. the beginning. 12. A porous rotary kiln, comprising a cylinder and an air channel for delivering pressured air to the cylinder, characterized in that the sealing device of the air channel is the sealing device according to any one of claims 1 to 11 .