A double sealing device and a rotary kiln equipped with the sealing device

Abstract

This invention discloses a dual-sealing device and a rotary kiln equipped with the device, belonging to the field of rotary kiln sealing technology. The invention includes an elastic sealing assembly and a wear-resistant ring. One end of the elastic sealing assembly is connected to a fixed cover, and the other end is connected to the wear-resistant ring. The wear-resistant ring is tightly fitted against the outer peripheral wall of the rotary kiln. The end of the elastic sealing assembly presses against the wear-resistant ring. The wear-resistant ring includes several interconnected wear-resistant blocks. One end of each wear-resistant block has a groove, and the other end has a protrusion. Ventilation grooves are formed on each wear-resistant block, and these grooves are interconnected to form an annular air-sealing channel. This invention employs a dual-sealing design of elastic sealing and air sealing, ensuring a good sealing effect and effectively preventing material leakage. Furthermore, the plug-in connection between the wear-resistant blocks effectively compensates for the radial expansion of the kiln after heating.

Description

Technical Field

[0001] This invention belongs to the field of rotary kiln sealing technology, and more specifically, relates to a double sealing device and a rotary kiln equipped with the sealing device. Background Technology

[0002] For the production of graphite anode materials for lithium-ion batteries, many companies in the market already use externally heated rotary kilns for granulation or carbonization of the anode materials. However, in daily production, it has been found that if the experience of using rotary kilns in other industries is simply copied, powder leakage or leakage of volatile matter may occur at the seal of the rotary kiln. In particular, since anode materials need to be granulated or carbonized in a protective gas atmosphere, if outside air is drawn into the rotary kiln, or if volatile matter carrying material leaks out of the rotary equipment, it will cause the volatile matter or even the material to burn, resulting in a serious decrease in product yield and quality. Therefore, a reliable sealing device must be installed between the rotary kiln shell and the fixed cover, and the quality of its sealing directly affects the stability of the rotary kiln system.

[0003] Traditional rotary kiln sealing devices are generally made of high-temperature resistant flexible materials, and the entire structure can deform with the movement of the rotary kiln to adapt to the kiln body deformation, eccentricity, and swaying caused by the high temperature. However, the sealing performance of traditional sealing devices needs further improvement.

[0004] A search revealed Chinese Patent Publication No. CN 209386779 U, filed on November 6, 2018, which discloses a rotary kiln sealing device. This application includes a sealing sleeve, a gas distribution pipe, sealing material, and a gland. The sealing sleeve is a hollow cylindrical sleeve, fitted loosely over one end of the rotary kiln tube. A vent is provided on the sealing sleeve, connected to the outlet pipe of an air compressor. Flanges are provided at both ends of the sealing sleeve. The gas distribution pipe is located inside the sealing sleeve and connected to the vent. The sealing material is disposed between the outer wall of the rotary kiln tube and the inner wall of the sealing sleeve. The gland is fitted loosely over the rotary kiln tube, connected to the flange at one end of the sealing sleeve, and the flange at the other end of the sealing sleeve is connected to the rotary kiln. This application forms a seal by pressing the packing material under the gland, but the radial deformation compensation is very small. Summary of the Invention

[0005] 1. The problem to be solved

[0006] To address the problem of poor sealing performance in existing rotary kiln sealing devices, this invention provides a dual-sealing device and a rotary kiln equipped with this device. This invention employs a dual-sealing design combining elastic sealing and gas sealing, ensuring a high sealing effect and effectively preventing material leakage. Furthermore, the sealing device of this invention can effectively compensate for the radial expansion of the kiln shell after heating.

[0007] 2. Technical Solution

[0008] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0009] The present invention provides a dual sealing device, comprising an elastic sealing component and a wear-resistant ring. One end of the elastic sealing component is connected to a fixed cover, and the other end is connected to the wear-resistant ring. The wear-resistant ring is tightly fitted to the outer peripheral wall of the rotating cylinder. The end of the elastic sealing component presses against the wear-resistant ring, and an air-sealing channel is formed at the contact point between the wear-resistant ring and the rotating cylinder.

[0010] Furthermore, the wear-resistant ring includes several interconnected wear-resistant blocks. One end of each wear-resistant block has a groove, and the other end has a protrusion. Adjacent wear-resistant blocks are connected end to end through the groove and the protrusion. Ventilation grooves are provided on the wear-resistant blocks, and multiple ventilation grooves are interconnected to form an annular air-sealing channel.

[0011] Furthermore, the inner layer of the elastic sealing assembly is composed of a plurality of first elastic pieces distributed in a ring, the outer layer of the elastic sealing assembly is composed of a plurality of second elastic pieces distributed in a ring, and a sealing cloth is provided between the inner layer and the outer layer.

[0012] Furthermore, one end of the first spring is connected to the wear-resistant block, and the other end is connected to the fixing cover, and the first spring covers the connection point of the adjacent wear-resistant blocks.

[0013] Furthermore, the second spring is wrapped with a steel wire rope around its outer periphery. After the steel wire rope passes over the fixed pulley, both ends are connected to counterweights. The fixed pulley is mounted on a fixed cover.

[0014] Furthermore, it also includes a clamping assembly, which includes a support rod and an elastic element. The elastic element is sleeved on the support rod, and the end of the support rod passes through the elastic sealing assembly and is connected to the wear-resistant block. A limiting element is provided on the support rod, and the elastic element is located between the limiting element and the elastic sealing assembly for clamping the end of the elastic sealing assembly.

[0015] Furthermore, the support rod is a hollow rod, and an air inlet is provided on the wear-resistant block. The support rod is connected to the air groove on the wear-resistant block through the air inlet.

[0016] Furthermore, the support rod is divided into three sections: an upper rod body, a middle rod body, and a lower rod body. The upper rod body is provided with external threads, and the limiting component is an adjusting nut. The middle rod body is a flexible hose, and the lower rod body is also provided with external threads.

[0017] Furthermore, all of the aforementioned support rods are connected to the annular air intake pipe, and the air intake pipe is connected to a fixing rod, one end of which is connected to a fixing cover.

[0018] A rotary kiln of the present invention uses the above-mentioned sealing device to seal the rotating cylinder and the fixed cylinder.

[0019] 3. Beneficial effects

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

[0021] (1) In a double sealing device of the present invention, one end of the elastic sealing component is connected to the wear-resistant ring, the wear-resistant ring is tightly fitted to the outer peripheral wall of the rotary cylinder, and an air seal channel is formed at the contact point between the wear-resistant ring and the rotary cylinder to form an air seal. In addition, the sealing function of the elastic sealing component itself further ensures the sealing effect and effectively prevents the leakage of materials. Furthermore, during the rotation of the rotary cylinder, the end of the elastic sealing component does not directly rub against the rotary cylinder, which is beneficial to improving the service life of the elastic sealing component.

[0022] (2) The present invention provides a dual sealing device. Through further optimization of the specific structure of the wear-resistant ring, the wear-resistant ring includes several interconnected wear-resistant blocks. After the rotating cylinder expands due to heat, the adjacent wear-resistant blocks are tightly fitted by grooves and protrusions, which can adapt to the radial expansion of the rotating cylinder and effectively prevent the wear-resistant ring from bearing excessive extrusion pressure and cracking during the process of compensating for radial deformation. In addition, the first elastic piece covers the connection of the adjacent wear-resistant blocks. In this way, when the adjacent wear-resistant blocks produce gaps due to the radial expansion of the cylinder, the elastic sealing component can form an effective seal on the gaps, ensuring the sealing effect of the entire device.

[0023] (3) A double sealing device of the present invention includes a pressing component comprising a support rod and an elastic element. The elastic element is located between the limiting element and the elastic sealing component. The pressing force of the elastic element is controlled by adjusting the limiting element to ensure a tight fit between the first spring sheet and the wear-resistant block, and between the wear-resistant block and the rotating cylinder, thereby further ensuring the sealing effect of the entire sealing device.

[0024] (4) A double sealing device of the present invention has a hollow support rod and an air inlet hole on the wear-resistant block. The support rod provides air to the air seal channel through the air inlet hole. The support rod provides support for the pressing assembly on the one hand and can be used as a ventilation pipe on the other hand. This design reduces the use of parts and makes the overall structure simpler.

[0025] (5) A double sealing device of the present invention has a support rod divided into three sections, wherein the upper and lower sections are provided with external threads, and the limiting component is an adjusting nut. By adjusting the nut and the external thread of the upper rod, the clamping force of the elastic component can be adjusted conveniently, quickly and stably. The external thread on the lower rod and the threaded hole on the wear-resistant block cooperate with each other to ensure a stable connection between the wear-resistant block and the support rod. The middle rod is a flexible hose, which can compensate for the radial displacement of the cylinder after thermal expansion and prevent the wear-resistant block from being damaged. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a double sealing device according to the present invention;

[0027] Figure 2 This is a front view of a double sealing device according to the present invention;

[0028] Figure 3 for Figure 2 Sectional view along the middle AA direction;

[0029] Figure 4 for Figure 3 Enlarged view of the structure at point A in the middle;

[0030] Figure 5 This is a schematic diagram of the wear-resistant block in this invention;

[0031] Figure 6 This is a schematic diagram of the clamping assembly in this invention;

[0032] In the diagram: 1. Elastic sealing assembly; 11. First spring; 12. Second spring; 13. Sealing cloth;

[0033] 2. Wear-resistant ring; 21. Wear-resistant block; 211. Groove; 212. Protrusion; 213. Vent groove; 214. Air inlet;

[0034] 31. Wire rope; 32. Fixed pulley; 33. Counterweight;

[0035] 4. Clamping assembly; 41. Support rod; 411. Upper rod body; 412. Middle rod body; 413. Lower rod body; 42. Elastic element; 43. Limiting element;

[0036] 5. Air inlet pipe; 6. Fixing rod; 7. Fixing cover; 8. Rotating cylinder. Detailed Implementation

[0037] The present invention will be further described below with reference to specific embodiments.

[0038] Example 1

[0039] like Figure 1 , Figure 2 , Figure 3As shown, this embodiment of a dual-sealing device includes an elastic sealing component 1 and a wear-resistant ring 2. One end of the elastic sealing component 1 is connected to a fixed cover 7, and the other end is connected to the wear-resistant ring 2. The wear-resistant ring 2 is tightly fitted to the outer peripheral wall of the rotating cylinder 8. The end of the elastic sealing component 1 presses against the wear-resistant ring 2, and an air-sealing channel is formed at the contact point between the wear-resistant ring 2 and the rotating cylinder 8. By introducing gas into this air-sealing channel, an effective air seal can be formed at the contact point between the wear-resistant ring 2 and the rotating cylinder 8. Combined with the sealing effect of the elastic sealing component itself, the sealing performance of the sealing device is guaranteed. In addition, the elastic sealing component 1 does not directly rub against the rotating cylinder 8, which helps to improve the service life of the elastic sealing component 1, thereby increasing the maintenance cycle of the entire sealing device.

[0040] In actual production, the rotary cylinder 8 needs to be heated at high temperatures, and after being heated, the rotary cylinder 8 will undergo a certain radial expansion. In order to ensure the sealing effect between the wear ring 2 and the rotary cylinder 8, the two are often tightly fitted together. In order to prevent the radial expansion of the rotary cylinder 8 from damaging the wear ring 2, the wear ring 2 needs to be further optimized in design so that it can adapt to the radial expansion of the rotary cylinder 8.

[0041] Specifically, in this embodiment, such as Figure 5 As shown, the wear-resistant ring 2 includes several interconnected wear-resistant blocks 21. One end of each wear-resistant block 21 has a groove 211, and the other end has a protrusion 212. Adjacent wear-resistant blocks 21 are connected end-to-end along the circumferential direction through the groove 211 and the protrusion 212. Ventilation grooves 213 are formed on each wear-resistant block 21, and multiple ventilation grooves 213 are interconnected to form an annular air-sealing channel. In this embodiment, the wear-resistant blocks 21 are tightly fitted together through the grooves and protrusions, which not only adapts to the radial expansion of the rotating cylinder 8 and prevents the wear-resistant ring 2 from being subjected to excessive compressive force and breaking during radial deformation compensation, but also provides a certain guiding and limiting effect on the movement of the wear-resistant blocks 21, effectively preventing misalignment between the wear-resistant blocks 21 and thus affecting the sealing effect.

[0042] like Figure 4 As shown, the inner layer of the elastic sealing assembly 1 consists of a plurality of first spring sheets 11 arranged in a ring, and the plurality of first spring sheets 11 are sequentially laminated. The outer layer of the elastic sealing assembly 1 consists of a plurality of second spring sheets 12 arranged in a ring, the second spring sheets 12 being located outside the adjacent first spring sheets 11 and also being laminated. A sealing cloth 13 is provided between the inner and outer layers, and the sealing cloth 13 may be made of refractory ceramic fiber material or carbon silicon aluminum composite plate.

[0043] Combination Figure 4 , Figure 6As shown, one end of the first spring piece 11 is connected to the wear-resistant block 21, and the other end is connected to the fixed cover 7, and the first spring piece 11 covers the connection of adjacent wear-resistant blocks 21. When adjacent wear-resistant blocks 21 produce gaps due to the radial expansion of the rotating cylinder 8, the first spring piece 11 can effectively seal the gaps, ensuring the sealing effect after expansion.

[0044] In addition, a steel wire rope 31 is wound around the outer periphery of the second spring piece 12. After the steel wire rope 31 passes over the fixed pulley 32, counterweights 33 are connected to both ends. The fixed pulley 32 is mounted on the fixed cover 7. The steel wire rope 31 can generate a certain radial clamping force on the second spring piece 12, making the contact between the components of the sealing device tighter and ensuring the sealing effect.

[0045] Example 2

[0046] This embodiment of the double sealing device, based on embodiment 1, further includes a pressing assembly 4. The pressing assembly 4 includes a support rod 41 and an elastic element 42. The elastic element 42 is sleeved on the support rod 41, and the end of the support rod 41 passes through a first spring plate 11 and connects to the wear-resistant block 21. A limiting element 43 is provided on the support rod 41, and the elastic element 42 is located between the limiting element 43 and the elastic sealing assembly 1, used to radially press the wear-resistant block 21, ensuring it maintains tight contact with the rotating cylinder 8 at all times. This design allows each wear-resistant block 21 to receive an individual pressing force, and during use, the corresponding pressing force can be adjusted according to the actual wear condition of each individual wear-resistant block 21.

[0047] The plurality of support rods 41 are distributed along the circumference of the wear-resistant ring 2, and all of the support rods 41 are connected to the annular air intake pipe 5. The air intake pipe 5 is connected to a fixing rod 6, one end of which is connected to a fixing cover 7.

[0048] Specifically, the support rod 41 is a hollow rod, and an air inlet 214 is provided on the wear-resistant block 21. The support rod 41 is connected to the ventilation groove 213 on the wear-resistant block 21 through the air inlet 214. The support rod 41 is divided into three sections: an upper rod body 411, a middle rod body 412, and a lower rod body 413. The upper rod body 411 has external threads, the limiting member 43 is an adjusting nut, and the elastic member 42 is a spring. The cooperation between the nut and the external threads makes it more convenient and quick to adjust the clamping force of the elastic member 42.

[0049] The lower rod body 413 is also provided with external threads, and the air inlet 214 is machined with internal threads. Through the threaded engagement, the rod 41 and the wear-resistant block 21 can achieve a quick and stable connection.

[0050] The intermediate rod 412 is a flexible hose, or an expansion joint is provided in the intermediate rod 412, which can compensate for the radial displacement of the cylinder after thermal expansion and prevent the wear-resistant block 21 from being damaged.

[0051] Example 3

[0052] In this embodiment, a rotary kiln uses the aforementioned sealing device to seal the rotary cylinder and the fixed cylinder.

[0053] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A double-sealing device, characterized in that: It includes an elastic sealing component (1) and a wear-resistant ring (2). One end of the elastic sealing component (1) is connected to the fixed cover (7), and the other end is connected to the wear-resistant ring (2). The wear-resistant ring (2) is tightly fitted to the outer peripheral wall of the rotary cylinder (8). The end of the elastic sealing component (1) presses against the wear-resistant ring (2), and an air seal channel is formed at the contact point between the wear-resistant ring (2) and the rotary cylinder (8). The wear-resistant ring (2) includes several interconnected wear-resistant blocks (21). One end of each wear-resistant block (21) has a groove (211) and the other end has a protrusion (212). Adjacent wear-resistant blocks (21) are connected end to end by the groove (211) and the protrusion (212), and gaps are generated between adjacent wear-resistant blocks (21) after radial expansion. The wear-resistant block (21) has a ventilation groove (213), and multiple ventilation grooves (213) are interconnected to form an annular air-sealing channel. The inner layer of the elastic sealing assembly (1) is composed of a plurality of first spring pieces (11) distributed in a ring. One end of the first spring piece (11) is connected to the wear-resistant block (21), and the other end is connected to the fixing cover (7). The first spring piece (11) covers the connection of adjacent wear-resistant blocks (21). It also includes a pressing assembly (4), which includes a support rod (41) and an elastic element (42). The elastic element (42) is sleeved on the support rod (41). The end of the support rod (41) passes through the elastic sealing assembly (1) and is connected to the wear-resistant block (21). A limiting element (43) is provided on the support rod (41). The elastic element (42) is located between the limiting element (43) and the elastic sealing assembly (1) and is used to press the end of the elastic sealing assembly (1).

2. The double sealing device according to claim 1, characterized in that: The outer layer of the elastic sealing assembly (1) is composed of multiple second spring pieces (12) distributed in a ring, and a sealing cloth (13) is provided between the inner and outer layers.

3. The double sealing device according to claim 2, characterized in that: The second spring (12) is wrapped with a steel wire rope (31). After the steel wire rope (31) passes over the fixed pulley (32), both ends are connected to counterweights (33). The fixed pulley (32) is set on the fixed cover (7).

4. The double sealing device according to claim 3, characterized in that: The support rod (41) is a hollow rod, and an air inlet (214) is provided on the wear-resistant block (21). The support rod (41) is connected to the ventilation groove (213) on the wear-resistant block (21) through the air inlet (214).

5. A double sealing device according to claim 4, characterized in that: The support rod (41) is divided into three sections: upper rod body (411), middle rod body (412) and lower rod body (413). The upper rod body (411) is provided with external threads, the limiting part (43) is an adjusting nut, the middle rod body (412) is a flexible hose, and the lower rod body (413) is also provided with external threads.

6. A double sealing device according to claim 5, characterized in that: The multiple support rods (41) are all connected to the annular air intake pipe (5), and the air intake pipe (5) is connected to a fixing rod (6), one end of which is connected to the fixing cover (7).

7. A rotary kiln, characterized in that: The sealing device includes any one of claims 1-6.

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