A rotary kiln gas sealing chamber sealing structure

Abstract

A rotary kiln gas-sealed chamber sealing structure includes a frame and a rotary kiln cylinder installed on the frame, a sealing chamber is sleeved on the outside of one end of the rotary kiln cylinder, the sealing chamber is installed on the frame, the outer side of the sealing chamber is sealed and connected to a fixed section installed on the frame, the sealing chamber includes a sealing shell, a first sealing ring and a second sealing ring are arranged inside the sealing shell, the inner ring of the first sealing ring and the inner ring of the second sealing ring are both sealed with the outer wall of the rotary kiln cylinder; an elastic tensioning assembly is detachably fixedly installed on the outside of the rotary kiln cylinder between the first sealing ring and the second sealing ring, the elastic tensioning assembly simultaneously presses the first sealing ring and the second sealing ring into the sealing shell from the opposite sides of the first sealing ring and the second sealing ring, so that the sealing chamber as a whole is kept sealed with the rotary kiln cylinder. Thus, while ensuring good sealing performance, the requirements for parts and installation accuracy are reduced, maintenance is convenient, and cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary kiln sealing, in particular to a rotary kiln gas sealing cavity type sealing structure. Background Art

[0002] The rotary kiln works under a slightly negative pressure (slightly lower than atmospheric pressure). There are gaps between the rotary kiln body and the kiln head cover and kiln tail cover. Therefore, a sealing structure needs to be designed to ensure that the inside of the rotary kiln is isolated from the outside environment to prevent air leakage and material leakage. There are many ways to seal the existing rotary kiln, such as cylinder seal, spring lever seal, and sheet seal.

[0003] Among the above sealing methods, the cylinder-type sealing pneumatic device system is complex and requires the installation of a special small air compressor for separate air supply, which is expensive and requires a lot of maintenance. The spring lever seal has relatively high requirements on the processing and installation accuracy of parts. The fish scales of the fish scale seal are short, which is inconvenient to install and maintain and easy to wear. Once the ventilation in the kiln is poor and the negative pressure at the kiln head fluctuates after wear, a large amount of material in the kiln will escape, forming dust to pollute the environment. Utility Model Content

[0004] In view of the shortcomings of the above-mentioned existing production technology, the applicant provides a rotary kiln gas-sealed chamber sealing structure, thereby achieving good sealing performance while reducing the requirements for parts and installation accuracy, facilitating maintenance and reducing costs.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A rotary kiln gas-sealed chamber sealing structure comprises a frame and a rotary kiln cylinder installed above the frame, wherein the rotary kiln cylinder is drivingly connected to a motor installed on the frame;

[0007] A sealing cavity is sleeved on the outside of one end of the rotary kiln cylinder, the sealing cavity is installed on the frame, the outer side of the sealing cavity is sealed and connected with the fixed section installed on the frame, the sealing cavity includes a sealing shell, a first sealing ring and a second sealing ring are arranged inside the sealing shell, the inner ring of the first sealing ring and the inner ring of the second sealing ring are both sealed and matched with the outer wall of the rotary kiln cylinder;

[0008] An elastic tensioning assembly is detachably fixedly installed on the outside of the rotary kiln cylinder between the first sealing ring and the second sealing ring. The first sealing ring and the second sealing ring are detachably fixedly connected to both ends of the elastic tensioning assembly. The elastic tensioning assembly presses the first sealing ring and the second sealing ring into the sealing shell from opposite sides of the first sealing ring and the second sealing ring at the same time, so that the sealing cavity as a whole is kept sealed with the rotary kiln cylinder.

[0009] Its further technical solution is:

[0010] The structure of the sealing shell is as follows: it includes a first end face flange, a cavity wall of a cylindrical structure and a second end face flange which are sequentially mounted on the outside of the rotary kiln cylinder along the end of the rotary kiln cylinder toward the middle direction; both ends of the cavity wall are respectively sealedly connected with the first end face flange and the second end face flange; a first sealing ring which is sealedly matched with the first end face flange and a second sealing ring which is sealedly matched with the second end face flange are arranged on the outer wall of the rotary kiln cylinder located in the cavity wall; and the first end face flange is sealedly connected with a fixed section installed on the frame.

[0011] The first sealing ring and the second sealing ring have the same structure, and both have rectangular cross-sections.

[0012] The structure of the elastic tensioning assembly is as follows: it comprises a plurality of connecting rods arranged between the first sealing ring and the second sealing ring, the axial direction of the connecting rod is parallel to the axial direction of the rotary kiln cylinder, one end of the connecting rod is fixedly connected to the second sealing ring, the other end of the connecting rod is movably connected to the first sealing ring, a first spring is sleeved on the outside of the connecting rod, one end of the first spring is connected to the first sealing ring, the other end of the first spring is connected to the middle part of the connecting rod, and the first spring is in a compressed state;

[0013] The connecting rod is connected to the rotary kiln cylinder through a fixing seat, and the connecting rod is slidably connected to a through hole arranged on the fixing seat.

[0014] The end of the first spring is connected to an adjusting cap installed on the middle part of the connecting rod, and the adjusting cap is threadedly connected to the middle part of the connecting rod.

[0015] The first sealing ring is provided with a sliding hole matched with the end of the connecting rod.

[0016] The cavity wall is provided with an air sealing interface which is in communication with an external air path.

[0017] An observation window corresponding to the elastic tensioning component is opened on the cavity wall.

[0018] The beneficial effects of the utility model are as follows:

[0019] The utility model has a compact and reasonable structure and is easy to operate. A sealing cavity is arranged at the end of a rotary kiln cylinder to connect a fixed section, and a sealing space is formed by enclosing a sealing shell, a first sealing ring, a second sealing ring and an outer wall of the rotary kiln cylinder, so that the inside of the kiln body is sealed and isolated from the external environment, forming a double-pass circumferential seal and an end face seal. At the same time, an elastic tensioning component is arranged in the sealing cavity to ensure a good sealing effect of the first sealing ring and the second sealing ring, so that the requirements for parts and installation accuracy are reduced while ensuring good sealing performance of the sealing structure, and the maintenance is convenient and the cost is low.

[0020] At the same time, the utility model also has the following advantages:

[0021] (1) By adjusting the installation position of the adjusting cap on the connecting rod, the initial state of the first spring is adjusted to ensure that the elastic tensioning assembly has sufficient clamping force on the first sealing ring and the second sealing ring to ensure a good sealing effect. Manual adjustment can also be performed when the clamping force of the elastic tensioning assembly is insufficient.

[0022] (3) Inert gas is filled into the sealed space in the sealed cavity through the air seal interface to seal the space, thereby preventing the medium in the rotary kiln from diffusing outward and external air from entering the kiln body, thereby further enhancing the sealing effect of the sealing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the utility model.

[0024] Figure 2 It is an exploded view of the utility model.

[0025] Figure 3 It is a cross-sectional view of the utility model.

[0026] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0027] Figure 5 It is a schematic diagram of the assembly structure of the sealing chamber and the elastic tensioning component of the utility model.

[0028] Figure 6 for Figure 5 Enlarged view of point B in the middle.

[0029] Figure 7 It is a schematic structural diagram of the elastic tensioning assembly of the present invention.

[0030] Figure 8 This is a schematic diagram of the control principle of the temperature inside the kiln, the pressure inside the kiln and the pressure in the sealed cavity of the utility model.

[0031] Wherein: 1. fixed section; 10. second support;

[0032] 2. Sealing cavity; 20. First support; 21. First end face flange; 22. Second end face flange; 23. Cavity wall; 24. First sealing ring; 2401. Sliding hole; 25. Second sealing ring;

[0033] 26. elastic tensioning assembly; 2603. connecting rod; 2604. adjusting cap; 2605. first spring;

[0034] 27. Fixed seat; 28. Observation window; 29. ​​Air seal interface;

[0035] 3. Rotary kiln cylinder; 31. Wheel belt; 5. Support wheel;

[0036] 7. Frame; 70. Motor. DETAILED DESCRIPTION

[0037] The specific implementation of the utility model is described below in conjunction with the accompanying drawings.

[0038] like Figure 1-Figure 6 As shown, the rotary kiln gas-sealed chamber sealing structure of this embodiment includes a frame 7 and a rotary kiln cylinder 3 installed above the frame 7, the rotary kiln cylinder 3 is transmission-connected to a motor 70 installed on the frame 7; a supporting wheel 5 cooperates with a belt 31 installed on the outside of the rotary kiln cylinder 3 so that the belt 31 can roll on the upper part of the supporting wheel 5, and the rotary kiln cylinder 3 rotates relative to the supporting wheel 5 with its own center line as the center under the drive of the motor 70.

[0039] A sealed cavity 2 is sleeved on the outside of one end of the rotary kiln cylinder 3, and the sealed cavity 2 is installed on the frame 7 through a first support 20. The outer side of the sealed cavity 2 is sealed and connected to a fixed section 1 installed on the frame 7, and the fixed section 1 is installed on the frame 7 through a second support 10. The sealed cavity 2 includes a sealed shell, and a first sealing ring 24 and a second sealing ring 25 are arranged inside the sealed shell. The inner ring of the first sealing ring 24 and the inner ring of the second sealing ring 25 are both sealed and matched with the outer wall of the rotary kiln cylinder 3;

[0040] An elastic tensioning assembly 26 is detachably fixedly installed on the outside of the rotary kiln cylinder 3 between the first sealing ring 24 and the second sealing ring 25. The first sealing ring 24 and the second sealing ring 25 are detachably fixedly connected to both ends of the elastic tensioning assembly 26. The elastic tensioning assembly 26 presses the first sealing ring 24 and the second sealing ring 25 into the inside of the sealing shell from opposite sides of the first sealing ring 24 and the second sealing ring 25 at the same time, so that the sealing cavity 2 as a whole is kept sealed with the rotary kiln cylinder 3.

[0041] The inner ring of the first sealing ring 24 and the inner ring of the second sealing ring 25 are both sealed with the outer wall of the rotary kiln cylinder 3 to form two circumferential seals. The elastic tensioning assembly 26, the first sealing ring 24 and the second sealing ring 25 are connected to each other and fixed relative to the outer wall of the rotary kiln cylinder 3, ensuring that the first sealing ring 24, the second sealing ring 25 and the outer wall of the rotary kiln cylinder 3 do not slide relative to each other, and the inner hole of the sealing ring is not worn. Such a sealing method ensures a good circumferential sealing effect.

[0042] The sealing shell is installed on the frame 7 through the first support 20 and is fixed relative to the frame 7. The elastic tensioning component 26 presses the first sealing ring 24 and the second sealing ring 25 into the inside of the sealing shell from the opposite sides of the first sealing ring 24 and the second sealing ring 25 at the same time, and the end faces of the first sealing ring 24 and the second sealing ring 25 and the sealing shell form a sealing structure, so that the sealing shell and the first sealing ring 24 and the second sealing ring 25 form an internally sealed cavity, that is, the sealing cavity 2, and the outer side of the sealing cavity 2 is sealed and connected to the fixed section 1 installed on the frame 7 to achieve the sealed installation of the fixed section 1.

[0043] The fixed section 1 is connected through a sealing cavity 2 arranged at the end of the rotary kiln cylinder 3, and a sealing space is formed by enclosing a sealing shell, a first sealing ring 24, a second sealing ring 25 and an outer wall of the rotary kiln cylinder 3, so that the inside of the kiln body is sealed and isolated from the external environment, forming a double-pass circumferential seal and an end face seal. At the same time, an elastic tensioning component 26 is arranged in the sealing cavity 2 to ensure a good sealing effect of the first sealing ring 24 and the second sealing ring 25, so as to ensure good sealing performance of the sealing structure while reducing the requirements on parts and installation accuracy, facilitating maintenance and having low cost.

[0044] like Figure 4-Figure 6 As shown, the structure of the sealing shell is: it includes a first end face flange 21, a cavity wall 23 of a cylindrical structure and a second end face flange 22 which are sequentially mounted on the outside of the rotary kiln cylinder 3 along the end of the rotary kiln cylinder 3 toward the middle direction, the two ends of the cavity wall 23 are respectively sealed with the first end face flange 21 and the second end face flange 22, a first sealing ring 24 which is sealed with the first end face flange 21 and a second sealing ring 25 which is sealed with the second end face flange 22 are arranged on the outer wall of the rotary kiln cylinder 3 located in the cavity wall 23, the first end face flange 21 is sealed with the fixed section 1 installed on the frame 7, and the first support 20 is installed on both sides of the outside of the cavity wall 23.

[0045] The fixed section 1 is the kiln head cover or kiln tail cover of the rotary kiln, and the rotary kiln cylinder 3 rotates relative to the fixed section 1 and the sealing chamber 2. During the operation of the rotary kiln, the rotating first sealing ring 24 and the stationary first end face flange 21 are in close contact and rotate relatively at the same time, and similarly, the second sealing ring 25 and the stationary first end face flange 21 and the stationary second end face flange 22 are in close contact and rotate relatively at the same time. Even if the first sealing ring 24 and the second sealing ring 25 are worn during use, the elastic tensioning assembly 26 can ensure that the sealing ring and the end face flange are in close contact, thereby ensuring the end face sealing effect.

[0046] like Figure 4 As shown, the first sealing ring 24 and the second sealing ring 25 have the same structure, and the cross-sections of both are rectangular structures.

[0047] like Figure 4-Figure 7As shown, the structure of the elastic tensioning assembly 26 is as follows: it includes a plurality of connecting rods 2603 arranged between the first sealing ring 24 and the second sealing ring 25, the axial direction of the connecting rod 2603 is parallel to the axial direction of the rotary kiln cylinder 3, one end of the connecting rod 2603 is fixedly connected to the second sealing ring 25, the other end of the connecting rod 2603 is movably connected to the first sealing ring 24, the outer portion of the connecting rod 2603 is sleeved with a first spring 2605, one end of the first spring 2605 is connected to the first sealing ring 24, the other end of the first spring 2605 is connected to the middle of the connecting rod 2603, and the first spring 2605 is in a compressed state;

[0048] The connecting rod 2603 is connected to the rotary kiln cylinder 3 through the fixing seat 27 , and the connecting rod 2603 is slidably connected to a through hole provided on the fixing seat 27 .

[0049] A plurality of connecting rods 2603 are evenly distributed along the circumferential direction of the outer wall of the rotary kiln cylinder 3, and it is sufficient for a portion of the connecting rods 2603 to be connected to the fixing seat 27.

[0050] The end of the first spring 2605 is connected to the adjusting cap 2604 installed in the middle of the connecting rod 2603 , and the adjusting cap 2604 is threadedly connected to the middle of the connecting rod 2603 .

[0051] By adjusting the installation position of the adjusting cap 2604 on the connecting rod 2603, the initial state of the first spring 2605 is adjusted to ensure that the elastic tensioning assembly 26 has sufficient clamping force on the first sealing ring 24 and the second sealing ring 25 to ensure a good sealing effect. Manual adjustment can also be performed when the clamping force of the elastic tensioning assembly 26 is insufficient.

[0052] The first sealing ring 24 is provided with a sliding hole 2401 which cooperates with the end of the connecting rod 2603 .

[0053] The first sealing ring 24 is provided with a sliding hole 2401 which cooperates with the end of the connecting rod 2603, so that the end of the connecting rod 2603 can move in the sliding hole 2401. After the first sealing ring 24 and the second sealing ring 25 are worn, the elastic force of the first spring 2605 is released, and at the same time, the connecting rod 2603 moves relative to the first sealing ring 24 and the fixing seat 27, thereby increasing the distance between the first sealing ring 24 and the second sealing ring 25, thereby ensuring that the first sealing ring 24 and the second sealing ring 25 are still in a compressed state, thereby ensuring good sealing.

[0054] The first sealing ring 24 and the second sealing ring 25 can be made of non-metallic material.

[0055] like Figure 3 As shown, a gas sealing interface 29 communicating with an external gas path is provided on the cavity wall 23 .

[0056] Inert gas is filled into the sealed space in the sealed cavity 2 through the air seal interface 29 to perform air sealing, thereby preventing the medium in the rotary kiln from diffusing outward and external air from entering the kiln body, thereby further enhancing the sealing effect of the sealing structure.

[0057] like Figure 5 As shown, an observation window 28 corresponding to the elastic tensioning assembly 26 is opened on the cavity wall 23.

[0058] The observation window 28 can be a cover plate structure that is sealed with the opening of the cavity wall 23. When the observation window 28 is opened, the states of the elastic tensioning assembly 26 and the first sealing ring 24 and the second sealing ring 25 can be conveniently observed. When the observation window 28 is opened, the rotary kiln cylinder 3 can be controlled to rotate to rotate the elastic tensioning assembly 26 that needs to be adjusted to the observation window 28, and the elastic tensioning assembly 26 can be adjusted, such as adjusting the installation position of the adjustment cap 2604 on the connecting rod 2603.

[0059] The rotary kiln using the utility model rotary kiln gas sealing chamber sealing structure needs to control the temperature in the kiln, the pressure in the kiln and the sealing chamber pressure during operation. The control principle diagram is as follows Figure 8 shown.

[0060] There are three indices that need to be balanced inside the rotary kiln, namely the kiln temperature, kiln pressure and sealed chamber pressure. The thermocouple installed inside the rotary kiln can monitor the kiln temperature. The normal kiln temperature needs to be maintained at 400±5℃. If it deviates from this value, the power regulator needs to be automatically adjusted by PLC to adjust the heating power of the kiln body. The deformation degree of the rotary kiln cylinder 3 is controlled by controlling the temperature.

[0061] The pressure inside the kiln is generally maintained at -30 to -100 Pa. The pressure transmitter will transmit the measured pressure inside the kiln to the PLC. If it deviates from this value, the PLC will automatically adjust the negative pressure fan connected to the inside of the rotary kiln cylinder 3 to balance the pressure inside the kiln.

[0062] Inert gas is used to fill the sealed chamber 2 to make the sealed chamber 2 in a positive pressure state. The sealed chamber pressure needs to be maintained at 0.15MPa. If it deviates from this value, the solenoid valve will automatically open, fill in inert gas, balance the air pressure, and ensure the air sealing effect in the sealed chamber 2.

[0063] The above description is an explanation of the utility model, not a limitation of the utility model. The scope of the utility model is defined by the claims. Any form of modification can be made within the protection scope of the utility model.

Claims

1. A rotary kiln gas sealing chamber sealing structure, characterized in that: It comprises a frame (7) and a rotary kiln cylinder (3) installed above the frame (7), wherein the rotary kiln cylinder (3) is drivingly connected to a motor (70) installed on the frame (7); A sealing chamber (2) is sleeved on the outside of one end of a rotary kiln cylinder (3), the sealing chamber (2) is mounted on a frame (7), the outer side of the sealing chamber (2) is sealed and connected to a fixed section (1) mounted on the frame (7), the sealing chamber (2) comprises a sealing shell, a first sealing ring (24) and a second sealing ring (25) are arranged inside the sealing shell, the inner ring of the first sealing ring (24) and the inner ring of the second sealing ring (25) are both sealed and matched with the outer wall of the rotary kiln cylinder (3); An elastic tensioning assembly (26) is detachably fixedly installed on the outside of the rotary kiln cylinder (3) between the first sealing ring (24) and the second sealing ring (25); the first sealing ring (24) and the second sealing ring (25) are detachably fixedly connected to the elastic tensioning assembly (26) at both ends; the elastic tensioning assembly (26) simultaneously presses the first sealing ring (24) and the second sealing ring (25) into the inside of the sealing shell from opposite sides of the first sealing ring (24) and the second sealing ring (25), so that the sealing cavity (2) as a whole is kept sealed with the rotary kiln cylinder (3).

2. A rotary kiln gas sealing chamber sealing structure as claimed in claim 1, characterized in that: The structure of the sealing shell is as follows: it comprises a first end face flange (21), a cavity wall (23) of a cylindrical structure and a second end face flange (22) which are sequentially mounted on the outside of the rotary kiln cylinder (3) from the end of the rotary kiln cylinder (3) to the middle direction; the two ends of the cavity wall (23) are respectively sealedly connected to the first end face flange (21) and the second end face flange (22); a first sealing ring (24) which is sealedly matched with the first end face flange (21) and a second sealing ring (25) which is sealedly matched with the second end face flange (22) are arranged on the outer wall of the rotary kiln cylinder (3) located in the cavity wall (23); and the first end face flange (21) is sealedly connected to a fixed section (1) installed on a frame (7).

3. A rotary kiln gas sealing chamber sealing structure as claimed in claim 1 or 2, characterized in that: The first sealing ring (24) and the second sealing ring (25) have the same structure, and both have rectangular cross-sections.

4. The rotary kiln gas sealing chamber sealing structure according to claim 1, characterized in that: The structure of the elastic tensioning assembly (26) is as follows: it comprises a plurality of connecting rods (2603) arranged between the first sealing ring (24) and the second sealing ring (25), the axial direction of the connecting rod (2603) is parallel to the axial direction of the rotary kiln shell (3), one end of the connecting rod (2603) is fixedly connected to the second sealing ring (25), the other end of the connecting rod (2603) is movably connected to the first sealing ring (24), the outside of the connecting rod (2603) is covered with a first spring (2605), one end of the first spring (2605) is connected to the first sealing ring (24), the other end of the first spring (2605) is connected to the middle part of the connecting rod (2603), and the first spring (2605) is in a compressed state; The connecting rod (2603) is connected to the rotary kiln cylinder (3) via a fixing seat (27), and the connecting rod (2603) is slidably connected to a through hole provided on the fixing seat (27).

5. A rotary kiln gas sealing chamber sealing structure as claimed in claim 4, characterized in that: The end of the first spring (2605) is connected to an adjustment cap (2604) installed in the middle of the connecting rod (2603), and the adjustment cap (2604) is threadedly connected to the middle of the connecting rod (2603).

6. A rotary kiln gas sealing chamber sealing structure as claimed in claim 4, characterized in that: The first sealing ring (24) is provided with a sliding hole (2401) that cooperates with the end of the connecting rod (2603).

7. The rotary kiln gas sealing chamber sealing structure according to claim 2, characterized in that: The cavity wall (23) is provided with a gas sealing interface (29) which is in communication with an external gas path.

8. The rotary kiln gas sealing chamber sealing structure according to claim 2, characterized in that: An observation window (28) corresponding to the elastic tensioning component (26) is formed on the cavity wall (23).

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