Rotary kiln barrel sealing device

Abstract

The utility model relates to the technical field of rotary kilns, in particular to a rotary kiln barrel sealing device, which is positioned at the end of a rotary kiln rotary barrel, is rotatably connected with the barrel and comprises a discharging cover, the opening end of the discharging cover is sleeved on the periphery of the barrel, and a sealing device is arranged between the inner side wall of the discharging cover and the outer side wall of the barrel. The first sealing device comprises a flexible pipeline, the flexible pipeline is annular, the outer ring wall of the flexible pipeline is fixedly connected with a discharging cover, the inner ring wall of the flexible pipeline is slidably connected with the cylinder body, a water inlet pipe and a water outlet pipe are arranged on the outer side wall of the discharging cover, and the water inlet pipe and the water outlet pipe penetrate through the side wall of the discharging cover to be communicated with the flexible pipeline. The friction coefficient between the sealing device and the cylinder body is low, the air tightness is good, under the condition that the roundness of the cylinder body of the rotary kiln is poor, the phenomena of air leakage and material leakage cannot occur, and the service life is longer.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary kilns, in particular to a rotary kiln cylinder sealing device. Background Art

[0002] The rotary kiln seal is a crucial component of the rotary kiln, effectively preventing gas and material leakage within the kiln and maintaining stable temperature and pressure. Existing rotary kilns often utilize fish scale seals. These seals utilize materials such as heat-resistant steel fish scales and ordinary steel plate fish scales to create a flexible seal that rotates with the kiln without excessive deformation. This prevents seal failure caused by deformation and misalignment of the seal material.

[0003] However, the existing fish scale sealing device with the above-mentioned structure has the following problems during use:

[0004] 1. Air Leakage: In high-temperature environments, the scale seal may leak air due to thermal expansion and contraction of the material. 2. Material Leakage: During operation, the scale seal often leaks due to poor roundness, wear, or improper installation of the rotary kiln cylinder. 3. Difficult Installation and Maintenance: The scale seal has a relatively complex structure, consisting of multiple components and connection methods, making it difficult to operate and costly to repair.

[0005] Therefore, there is an urgent need for a rotary kiln cylinder sealing device with good sealing effect and easy installation. Summary of the Invention

[0006] The utility model aims to solve the problems of air leakage and material leakage in the actual application of the existing rotary kiln sealing device and provides a rotary kiln cylinder sealing device. The friction coefficient between the sealing device and the cylinder is low and the air tightness is good. Even if the rotary kiln cylinder has poor roundness, air leakage and material leakage will not occur, and the service life is extended.

[0007] In order to achieve the above purpose, the technical solution of the utility model is:

[0008] A rotary kiln cylinder sealing device is located at the end of the rotary kiln's rotating cylinder and is rotatably connected to the cylinder. It includes a discharge hood, the open end of which is sleeved on the outer periphery of the cylinder. A sealing device is provided between the inner sidewall of the discharge hood and the outer sidewall of the cylinder. The sealing device includes a flexible pipe. The flexible pipe is annular, the outer ring wall of the flexible pipe is fixedly connected to the discharge hood, and the inner ring wall of the flexible pipe is slidably connected to the cylinder. The outer wall of the discharge hood is provided with an inlet pipe and an outlet pipe. The inlet pipe and the outlet pipe pass through the side wall of the discharge hood and connect to the flexible pipe. The inlet pipe is used to introduce fluid into the flexible pipe to expand the flexible pipe, and the outlet pipe is used to discharge fluid in the flexible pipe to contract the flexible pipe. The flexible pipe expands and fills the gap between the discharge hood and the cylinder, thereby achieving a sealing effect.

[0009] Furthermore, a wear-resistant layer is provided on the outer wall of the discharge hood where it meets the flexible pipe. The flexible pipe is slidably connected to the wear-resistant layer via lubricating oil. The wear-resistant layer is a mirror-finished metal plate. This reduces friction loss between the flexible pipe and the cylinder and increases the service life of the flexible pipe.

[0010] Furthermore, the water inlet pipe and the water outlet pipe are connected to a circulating water pump, and the fluid is cooling water, cooling oil or coolant, thereby reducing the temperature of the flexible pipe and preventing the flexible pipe from being deformed or damaged due to high temperature.

[0011] Furthermore, the flexible pipe is connected to a constant pressure pipe, which passes through the side wall of the discharge cover and is connected to a pressure-stabilizing water tank. The pressure-stabilizing water tank keeps the fluid in the flexible pipe at a constant pressure and constant volume.

[0012] Furthermore, the first sealing device further includes an annular dust shield disposed on the other side of the flexible pipe away from the discharge hood port. The outer annular wall of the dust shield is fixed to the inner wall of the discharge hood, and a gap is formed between the inner annular wall of the dust shield and the barrel. The dust shield is used to protect the flexible pipe and prevent debris from entering the discharge hood and affecting the sealing effect of the flexible pipe.

[0013] Furthermore, the invention further comprises a second sealing device, which is arranged at the end of the discharge cover, is fixedly connected to the discharge cover and slidably connected to the cylinder, and is used for radial sealing of the rotating cylinder.

[0014] Furthermore, the secondary sealing device includes a first support plate, a screw, and a sealing ring. The first support plate is provided on the outer wall of the discharge cover, and a second support plate is provided on the outer wall of the cylinder body, parallel to the first support plate. The screw passes through the first support plate and connects to the sealing ring. A nut is sleeved on the screw, and the sealing ring is pressed against the second support plate by tightening the nut, thereby forming a contact seal between the sealing ring and the second support plate.

[0015] Through the above technical solution, the beneficial effects of the utility model are:

[0016] The utility model provides a flexible pipe. By introducing fluid into the flexible pipe, the flexible pipe is expanded and closely fits the surface of the cylinder. Even if the circularity of the rotating cylinder of the rotary kiln is poor, the flexible pipe will change accordingly during the rotation process to achieve a completely airtight effect. The utility model is suitable for the rotary sealing of large cylinders.

[0017] The flexible pipe of the utility model is connected to a circulating water pump, and cold fluid is pumped into the flexible pipe through the circulating water pump, so that the flexible pipe is always kept in a low temperature state. Compared with the sealing rubber ring in the prior art, the performance degradation of the sealing device due to high temperature denaturation is avoided, the service life is longer, and it can be used for the rotary seal of a cylinder containing high-temperature materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the external structure of the utility model;

[0019] Figure 2 It is a cross-sectional view of the internal structure of the utility model;

[0020] Figure 3 This utility model Figure 2 A magnified view of the details at center A;

[0021] Figure 4 It is along Figure 1 Cross-sectional view along the midline BB;

[0022] Figure 5 This is a schematic diagram of the separation of the cylinder and the discharge cover of the utility model;

[0023] The numbers in the accompanying drawings are: 1 is the cylinder, 11 is the second support plate, 2 is the discharge cover, 3 is a sealing device, 31 is a flexible pipe, 32 is the water inlet pipe, 33 is the water outlet pipe, 34 is the constant pressure pipe, 35 is the ash baffle, 4 is the second sealing device, 41 is the first support plate, 42 is the screw, and 43 is the sealing ring. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0025] like Figures 1 to 5As shown, this embodiment provides a rotary kiln cylinder sealing device, which is located at the end of the rotary kiln rotating cylinder 1 and is rotatably connected to the cylinder 1. It includes a discharge hood 2, a first sealing device 3, and a second sealing device 4. The open end of the discharge hood 2 is sleeved on the outer circumference of the cylinder 1. The discharge hood 2 and the cylinder 1 are both fixed to the ground via a bracket, so there is no axial displacement between them. The first sealing device 3 is provided between the inner side wall of the discharge hood 2 and the outer side wall of the cylinder 1, and the second sealing device 4 is provided between the end of the discharge hood 2 and the cylinder 1. The first sealing device 3 and the second sealing device 4 maintain a stable pressure in the cylinder 1, preventing gas leakage, reducing material loss, and improving equipment performance.

[0026] like Figures 3 and 4 As shown, the sealing device 3 includes a flexible pipe 31 and an ash baffle 35. The flexible pipe 31 is annular, with its outer ring wall fixedly connected to the discharge hood 2 and its inner ring wall slidably connected to the cylinder 1. An inlet pipe 32 and an outlet pipe 33 are provided on the outer wall of the discharge hood 2. The inlet pipe 32 and the outlet pipe 33 pass through the side wall of the discharge hood 2 and connect to the flexible pipe 31. The inlet pipe 32 is used to introduce fluid into the flexible pipe 31, causing the flexible pipe 31 to expand and thereby fill the gap between the discharge hood 2 and the cylinder 1 to achieve a sealing effect. The outlet pipe 33 is used to discharge the fluid in the flexible pipe 31, causing the flexible pipe 31 to contract, thereby separating the discharge hood 2 from the cylinder 1.

[0027] Specifically, in order to reduce the friction loss between the flexible pipe 31 and the cylinder 1, the flexible pipe 31 is a rubber tube, and a wear-resistant layer is provided on the outer wall of the discharge hood 2 at the junction with the flexible pipe 31. The wear-resistant layer is a mirror metal plate, and the surface of the wear-resistant layer is coated with lubricating oil. The flexible pipe 31 is slidably connected to the wear-resistant layer through the lubricating oil. In this embodiment, the wear-resistant layer is a mirror stainless steel plate. The low friction coefficient of mirror stainless steel plus lubricating oil and rubber is utilized to reduce friction loss and increase the service life of the rubber tube.

[0028] When the rotary kiln's rotating cylinder 1 is filled with high-temperature materials, the water inlet pipe 32 and the water outlet pipe 33 are connected to the circulating water pump, and the circulating water pump introduces cooling water, cooling oil or coolant into the flexible pipe 31. On the one hand, the circulating water pump fills the flexible pipe 31, causing the flexible pipe 31 to expand and fill the gap between the discharge cover 2 and the cylinder 1 to achieve a sealing effect; on the other hand, the circulating water pump takes away the heat from the surface of the flexible pipe 31, preventing the flexible pipe 31 from deformation and damage due to high temperature, thereby extending the service life of the sealing device.

[0029] To maintain the fluid in the flexible conduit 31 at a constant pressure and constant volume, the flexible conduit 31 is provided with, in addition to the water inlet pipe 32 and the water outlet pipe 33, two constant pressure pipes 34, each of which passes through the side wall of the discharge hood 2 and connects to a pressure-stabilizing water tank. This pressure-stabilizing water tank is a mature existing technology in the water supply field. Its main structure includes an airbag, which stabilizes the water pressure by compressing the gas inside the airbag. The specific structure is not detailed here.

[0030] Specifically, the flexible pipe 31 is annular, and an inlet pipe 32, a constant pressure pipe 34 1, an outlet pipe 33 and a constant pressure pipe 34 2 are arranged in a clockwise direction on the flexible pipe 31. The angle between each two adjacent pipes is 90°. The inlet pipe 32, the outlet pipe 33 and the two constant pressure pipes 34 are symmetrically arranged on the flexible pipe 31 to keep the water pressure stable at various locations in the flexible pipe 31.

[0031] like Figure 3 、 Figure 5 As shown, the ash deflector 35 is annular and is disposed on the other side of the flexible pipe 31 away from the outlet port of the discharge hood 2. The outer annular wall of the ash deflector 35 is fixed to the inner wall of the discharge hood 2. A gap exists between the inner annular wall of the ash deflector 35 and the cylinder 1. The height of the ash deflector 35 is less than the height of the flexible pipe 31 after expansion, so that the inner annular wall of the flexible pipe 31 can be closely attached to the cylinder 1. The ash deflector 35 is used to protect the flexible pipe 31 and prevent debris from entering through the discharge hood 2, which could affect the sealing effect of the flexible pipe 31.

[0032] The second sealing device 4 is fixedly connected to the discharge cover 2 and slidably connected to the cylinder 1. The second sealing device 4 includes a first support plate 41, a screw 42 and a sealing ring 43. The first support plate 41 is provided on the outer wall of the discharge cover 2, and the second support plate 11 parallel to the first support plate 41 is provided on the outer wall of the cylinder 1. The screw 42 passes through the first support plate 41 and connects to the sealing ring 43. A nut is sleeved on the screw 42. By screwing the nut, the sealing ring 43 is pressed against the second support plate 11, so that a contact seal is formed between the sealing ring 43 and the second support plate 11. The sealing ring 43 is made of graphite block material, has excellent high temperature resistance and good self-lubricating performance, can reduce friction and improve the sealing effect during the rotation of the cylinder 1.

[0033] Specifically, the first support plate 41 and the sealing ring 43 are both annular in shape, and a plurality of parallel screws 42 are evenly distributed between the first support plate 41 and the sealing ring 43. A limiting plate and a push plate are also provided on the other side of the sealing ring 43 away from the second support plate 11. The limiting block is arranged parallel to the first support plate 41 and is fixed on the discharge cover 2. The screw 42 passes through the limiting plate and is fixedly connected to the push plate. The two ends of the limiting plate extend outward to form a card groove, and a push plate and a sealing ring 43 are arranged in the card groove. The push plate is annular in shape, and the screw 42 is pressed against the sealing ring 43 through the push plate. The first support plate 41 and the limiting plate jointly limit the position of the screw 42 to prevent the screw 42 from shaking.

[0034] In order to enable the screw rod 42 to automatically reset, a spring is sleeved on the screw rod 42. When the nut is loosened, the spring drives the screw rod 42 to move relative to the first support plate 41, saving manpower.

[0035] The working principle of this utility model:

[0036] When using a sealing device 3, the circulating water pump is turned on to introduce circulating fluid into the flexible pipe 31. The circulating fluid fills the flexible pipe 31, causing it to expand and fill the gap between the discharge cover 2 and the cylinder 1, thereby achieving an axial sealing effect. During this process, the pressure-stabilizing water tank keeps the fluid in the flexible pipe 31 at a constant pressure. Even if the cylinder 1 has poor roundness, the flexible pipe 31 will deform accordingly and always be in close contact with the outer wall of the cylinder 1, thereby achieving a sealing effect.

[0037] When using the secondary sealing device 4, the nut is screwed to make the sealing ring 43 fit tightly with the second support plate 11 on the cylinder 1 through the screw 42 to achieve a radial sealing effect. During the rotation of the cylinder 1, the sealing ring 43 and the second support plate 11 slide relative to each other. The sealing ring 43 is preferably made of graphite block, which can reduce friction and improve the sealing effect.

[0038] The embodiments described above are only preferred embodiments of the present invention and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structure, features and principles described in the patent scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A rotary kiln cylinder sealing device, located at the end of a rotary kiln rotating cylinder (1) and rotatably connected to the cylinder (1), characterized in that: The invention comprises a discharge hood (2), wherein the open end of the discharge hood (2) is sleeved on the outer periphery of the cylinder (1), and a sealing device (3) is provided between the inner side wall of the discharge hood (2) and the outer side wall of the cylinder (1), and the sealing device (3) comprises a flexible pipe (31), the flexible pipe (31) is annular, the outer ring wall of the flexible pipe (31) is fixedly connected to the discharge hood (2), and the inner ring wall of the flexible pipe (31) is slidably connected to the cylinder (1), and the outer side wall of the discharge hood (2) is provided with a water inlet pipe (32) and a water outlet pipe (33), the water inlet pipe (32) and the water outlet pipe (33) pass through the side wall of the discharge hood (2) and communicate with the flexible pipe (31), the water inlet pipe (32) is used to introduce fluid into the flexible pipe (31) to expand the flexible pipe (31), and the water outlet pipe (33) is used to discharge the fluid in the flexible pipe (31) to shrink the flexible pipe (31).

2. A rotary kiln cylinder sealing device according to claim 1, characterized in that: A wear-resistant layer is provided on the outer wall of the discharge cover (2) at the junction with the flexible pipe (31), and the flexible pipe (31) is slidably connected to the wear-resistant layer through lubricating oil. The wear-resistant layer is a mirror metal plate.

3. The rotary kiln cylinder sealing device according to claim 1, characterized in that: The water inlet pipe (32) and the water outlet pipe (33) are connected to a circulating water pump, and the fluid is cooling water, cooling oil or cooling liquid.

4. A rotary kiln cylinder sealing device according to claim 1, characterized in that: The flexible pipe (31) is also connected to a constant pressure pipe (34), and the constant pressure pipe (34) passes through the side wall of the discharge cover (2) and is connected to the pressure-stabilizing water tank.

5. The rotary kiln cylinder sealing device according to claim 1, characterized in that: The sealing device (3) further comprises an ash baffle (35) which is annular and is arranged on the other side of the flexible pipe (31) away from the port of the discharge hood (2). The outer annular wall of the ash baffle (35) is fixed to the inner wall of the discharge hood (2), and a gap exists between the inner annular wall of the ash baffle (35) and the cylinder (1).

6. The rotary kiln cylinder sealing device according to claim 1, characterized in that: It also includes a second sealing device (4), which is arranged at the end of the discharge cover (2). The second sealing device (4) is fixedly connected to the discharge cover (2) and slidably connected to the cylinder (1).

7. A rotary kiln cylinder sealing device according to claim 6, characterized in that: The second sealing device (4) comprises a first support plate (41), a screw (42) and a sealing ring (43). The first support plate (41) is provided on the outer wall of the discharge cover (2), and a second support plate (11) parallel to the first support plate (41) is provided on the outer wall of the cylinder (1). The screw (42) passes through the first support plate (41) and is connected to the sealing ring (43). A nut is sleeved on the screw (42), and the sealing ring (43) is pressed against the second support plate (11) by screwing the nut.

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