Double sealing structure of rotary kiln

Abstract

The application relates to the rotary kiln sealing field, in particular to a double sealing structure of a rotary kiln, which comprises a rotary kiln body and a kiln head, the rotary kiln body is arranged to be inclined towards the inside of the kiln head, and a supporting plate for supporting the rotary kiln body is arranged on the kiln head. The double sealing structure of the rotary kiln has the advantages that through transmission, the sealing piston plate at the other end of the transmission rod is pushed to slide in the inside of the protection box through the rubber plate on the driving ring; in the process of the movement of the sealing piston plate, the pressure on the side of the sealing piston plate close to the graphite block sealing ring is increased; the other side of the graphite block sealing ring is pushed under the action of the pressure in the inside of the protection box; the graphite block sealing ring is pushed through the axial forces on the two sides of the graphite block sealing ring; the graphite block sealing ring is prevented from moving axially and being abraded intensively due to the uneven axial force of the graphite block sealing ring; and the sealing effect of the graphite block sealing ring on the rotary kiln in the processing process is improved.

Description

Technical Field

[0001] This invention relates to the field of rotary kiln sealing, specifically a double sealing structure for rotary kilns. Background Technology

[0002] Rotary kilns are key production equipment in industries such as alumina, cement, chemicals, and metallurgy. Operating under negative pressure, excessive air leakage at the hot end reduces the amount of secondary air entering the kiln, leading to heat loss. During operation, the quality of the rotary kiln's seal significantly impacts the overall process parameters of clinker calcination and the equipment's efficient operation. Under complex process conditions, the seal must possess the following characteristics: no air leakage, no ash leakage, no material leakage, high temperature resistance, wear resistance, long service life, high reliability, easy installation, and convenient maintenance, all while maintaining reasonable operating costs.

[0003] Currently, commonly used sealing devices for rotary kilns include labyrinth seals, friction seals, air seals, and combined seals. Friction seals are mainly divided into radial friction and axial friction seals. These devices provide high sealing performance during rotary kiln operation. The sealing process is achieved through graphite block sealing rings. However, during the sealing process, one side of the graphite block sealing ring is subjected to axial compression and pushing by the pressure inside the kiln head, causing uneven force on the graphite block sealing ring, resulting in axial movement and accelerated wear, which is not conducive to the sealing use of rotary kilns. Summary of the Invention

[0004] To address the problems in the prior art, the present invention provides a double sealing structure for a rotary kiln.

[0005] The technical solution adopted by this invention to solve its technical problem is: a double-sealing structure for a rotary kiln, including a rotary kiln body and a kiln head. The rotary kiln body is inclined towards the inside of the kiln head. A support plate for supporting the rotary kiln body is provided on the kiln head. Multiple support components for supporting the kiln head during rotation are provided on the support plate. A drive mechanism for driving the rotary kiln body during use is provided on the support plate. A graphite block sealing ring is fitted on the rotary kiln body. The graphite block sealing ring is installed on the kiln head. A protective box for sealing and protecting the graphite block sealing ring is installed on the kiln head. A sealing mechanism for axially pushing and sealing the graphite block sealing ring is provided inside the protective box.

[0006] The sealing mechanism includes a sealing piston plate slidably connected inside the protective box, the sealing piston plate being matched with the interior of the protective box, an annular plate fixed on the side wall of the rotary kiln body, a drive ring threadedly connected to the outer side wall of the annular plate, a rubber plate being provided on the side of the drive ring facing the kiln head, a transmission rod fixed on the sealing piston plate, the other end of the transmission rod penetrating the protective box and abutting against the rubber plate, a transmission mechanism for driving the drive ring being provided inside the kiln head, and a detection mechanism for detecting and identifying the sealing effect inside the protective box being provided on the support plate.

[0007] The transmission mechanism includes a drive rod slidably connected to the kiln head. The kiln head is provided with a guide assembly for guiding the movement of the drive rod. An operating rod is fixed to one end of the drive rod. A conical groove is opened on the side wall of the operating rod. A transmission plate is fixed on the side wall of the drive ring. The transmission plate abuts against the conical groove. A pulling mechanism for pulling the drive rod is provided inside the kiln head.

[0008] The guide assembly includes fixed plates on both sides of the drive rod, and a guide rod is slidably connected to the two fixed plates. One end of the guide rod is fixed to the side wall of the kiln head.

[0009] The pulling mechanism includes a sealing box installed on one side of the kiln head. One end of the drive rod is located inside the sealing box and a piston is fixed thereon. The piston is slidably connected inside the sealing box, and the piston and the interior of the sealing box are matched to each other.

[0010] The support assembly includes multiple mounting plates fixed to the support plate, each mounting plate having an arc-shaped groove at its upper end, and multiple rotating rings fixed to the side wall of the rotary kiln body, each rotating ring being rotatably connected to the arc-shaped groove.

[0011] The driving mechanism includes an annular rack mounted on the side wall of the rotary kiln body, a U-shaped plate fixed on the support plate, a drive motor mounted on the U-shaped plate, a gear fixed at the conveying end of the drive motor, and the gear and the annular rack being matched and configured to match each other.

[0012] The detection mechanism includes a proximity switch mounted on a mounting plate for detecting and identifying the position of the drive rod.

[0013] The beneficial effects of this invention are:

[0014] (1) The double sealing structure of the rotary kiln described in this invention drives the drive ring to move towards the protective box through transmission. During the movement of the drive ring, the rubber plate on the drive ring pushes the sealing piston plate at the other end of the transmission rod to slide inside the protective box. During the movement of the sealing piston plate, the pressure on the side of the sealing piston plate close to the graphite block sealing ring increases. Under the action of the pressure inside the protective box, the other side of the graphite block sealing ring is pushed. The axial force on both sides of the graphite block sealing ring pushes the graphite block sealing ring at the same time, avoiding uneven axial force on the graphite block sealing ring, which causes axial movement of the graphite block sealing ring and aggravates wear. This improves the sealing effect of the graphite block sealing ring in the rotary kiln processing process.

[0015] (2) The double sealing structure of the rotary kiln described in this invention makes it easy to identify whether there is a gap between the graphite block sealing ring and the inside of the protective box by the light of the proximity switch during the sealing process. This further facilitates the precise control of the timing of replacing the graphite block sealing ring and the effective protection of the graphite block sealing ring. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 A schematic diagram of the overall external structure of a rotary kiln with a double sealing structure provided by the present invention;

[0018] Figure 2 A schematic diagram of the drive mechanism and support assembly structure of a rotary kiln with a double sealing structure provided by the present invention;

[0019] Figure 3 A schematic diagram of the internal structure of the sealing mechanism of a rotary kiln with a double sealing structure provided by the present invention;

[0020] Figure 4 A schematic diagram of the drive mechanism for a double-sealed structure of a rotary kiln provided by the present invention;

[0021] Figure 5 for Figure 2 Enlarged structural diagram at point A;

[0022] Figure 6 for Figure 3 Enlarged structural diagram at point B;

[0023] Figure 7 for Figure 4 A magnified structural diagram at point C.

[0024] In the diagram: 1. Rotary kiln body; 2. Kiln head; 3. Support plate; 401. Mounting plate; 402. Rotating ring; 501. Annular rack; 502. U-shaped plate; 503. Drive motor; 504. Gear; 6. Graphite block sealing ring; 7. Protective box; 801. Sealing piston plate; 802. Annular plate; 803. Drive ring; 804. Rubber plate; 805. Transmission rod; 901. Drive rod; 902. Operating rod; 903. Conical groove; 904. Transmission plate; 1001. Fixing plate; 1002. Guide rod; 1101. Sealing box; 1102. Piston; 12. Proximity switch. Detailed Implementation

[0025] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. It should be noted that the illustrations provided in the following embodiments are for illustrative purposes only and represent schematic diagrams, not actual pictures, and should not be construed as limiting the present invention. In order to better illustrate the embodiments of the present invention, some components in the figures may be omitted, enlarged, or reduced, and do not represent the actual product size; it is understandable for those skilled in the art that some well-known structures and their descriptions may be omitted in the figures.

[0026] In the figures of this invention, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figure, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the figures are only for illustrative purposes and should not be construed as limiting this invention. For those skilled in the art, the specific meaning of the above-mentioned terms can be understood according to the specific circumstances.

[0027] like Figure 1-7 The present invention discloses a double-sealing structure for a rotary kiln, comprising a rotary kiln body 1 and a kiln head 2. The rotary kiln body 1 is inclined toward the interior of the kiln head 2. A support plate 3 is provided on the kiln head 2 for supporting the rotary kiln body 1. The support plate 3 is provided with a plurality of support components for supporting the kiln head 2 during rotation. A drive mechanism is provided on the support plate 3 for driving the rotary kiln body 1 during use. A graphite block sealing ring 6 is fitted on the rotary kiln body 1. The graphite block sealing ring 6 is installed on the kiln head 2. A protective box 7 is installed on the kiln head 2 for sealing and protecting the graphite block sealing ring 6. A sealing mechanism is provided inside the protective box 7 for axially pushing and sealing the graphite block sealing ring 6.

[0028] Specifically, the sealing mechanism includes a sealing piston plate 801 slidably connected inside the protective box 7. The sealing piston plate 801 is matched with the interior of the protective box 7. An annular plate 802 is fixed on the side wall of the rotary kiln body 1. A drive ring 803 is threadedly connected to the outer side wall of the annular plate 802. A rubber plate 804 is provided on the side of the drive ring 803 facing the kiln head 2. A transmission rod 805 is fixed on the sealing piston plate 801. The other end of the transmission rod 805 passes through the protective box 7 and abuts against the rubber plate 804. A transmission mechanism for driving the drive ring 803 is provided inside the kiln head 2. A detection mechanism for detecting and identifying the sealing effect inside the protective box 7 is provided on the support plate 3. Through transmission, the drive ring 803 is driven. 3. The drive ring 803 moves towards the protective box 7 under force. During the movement of the drive ring 803, the rubber plate 804 on the drive ring 803 pushes the sealing piston plate 801 at the other end of the transmission rod 805 to slide inside the protective box 7. During the movement of the sealing piston plate 801, the pressure on the side of the sealing piston plate 801 close to the graphite block sealing ring 6 increases. Under the action of the pressure inside the protective box 7, the other side of the graphite block sealing ring 6 is pushed. The axial force on both sides of the graphite block sealing ring 6 pushes the graphite block sealing ring 6 simultaneously, avoiding uneven axial force on the graphite block sealing ring 6, which would cause axial movement of the graphite block sealing ring 6 and aggravate wear. This improves the sealing effect of the graphite block sealing ring 6 in the rotary kiln processing process.

[0029] Specifically, the transmission mechanism includes a drive rod 901 slidably connected to the kiln head 2. The kiln head 2 is provided with a guide assembly for guiding the movement of the drive rod 901. An operating rod 902 is fixed to one end of the drive rod 901. A conical groove 903 is provided on the side wall of the operating rod 902. A transmission plate 904 is fixed to the side wall of the drive ring 803. The transmission plate 904 abuts against the conical groove 903. A pulling mechanism is provided inside the kiln head 2 for pulling the drive rod 901. Through the pulling mechanism, the operating rod 902 at the other end of the drive rod 901 moves synchronously. During the movement of the operating rod 902, the interaction between the conical groove 903 and the transmission plate 904 pushes the drive ring 803 to move under force.

[0030] Specifically, the guide assembly includes fixed plates 1001 fixed on both sides of the drive rod 901, and guide rods 1002 are slidably connected to the two fixed plates 1001. One end of the guide rod 1002 is fixed to the side wall of the kiln head 2. The movement of the drive rod 901 is guided by the fixed plates 1001 and the guide rods 1002.

[0031] Specifically, the pulling mechanism includes a sealing box 1101 installed on one side of the kiln head 2. One end of the drive rod 901 is located inside the sealing box 1101 and a piston 1102 is fixed thereon. The piston 1102 is slidably connected inside the sealing box 1101. The piston 1102 and the interior of the sealing box 1101 are matched and configured. Since the inside of the kiln head 2 is in a high-temperature state, under the action of the pressure inside the kiln head 2, the piston 1102 is pushed to move away from the kiln head 2 inside the sealing box 1101. During the movement of the piston 1102, the operating rod 902 at the other end of the drive rod 901 moves synchronously.

[0032] Specifically, the support assembly includes multiple mounting plates 401 fixed on the support plate 3. Each mounting plate 401 has an arc-shaped groove at its upper end. Multiple rotating rings 402 are fixed on the side wall of the rotary kiln body 1. Each rotating ring 402 is rotatably connected to the arc-shaped groove. The rotation of the rotary kiln body 1 is supported by the mounting plates 401 and the rotating rings 402.

[0033] Specifically, the drive mechanism includes an annular rack 501 mounted on the side wall of the rotary kiln body 1, a U-shaped plate 502 fixed on the support plate 3, a drive motor 503 mounted on the U-shaped plate 502, a gear 504 fixed at the conveying end of the drive motor 503, and the gear 504 and the annular rack 501 being matched and configured to rotate. When the drive motor 503 is started, it drives the gear 504 to rotate. During the rotation of the gear 504, the rotary kiln body 1 is driven to rotate through the meshing transmission between the gear 504 and the annular rack 501.

[0034] Specifically, the detection mechanism includes a proximity switch 12 installed on the mounting plate 401 for detecting and identifying the position of the drive rod 901. The illumination of the proximity switch 12 helps to identify whether there is a gap between the graphite block sealing ring 6 and the inside of the protective box 7, further facilitating precise control over when to replace the graphite block sealing ring 6 and ensuring effective protection of the graphite block sealing ring 6.

[0035] Working principle: During the operation of the rotary kiln, the raw material to be processed is first placed into the interior of the rotary kiln body 1. The drive motor 503 is started, which drives the gear 504 to rotate. During the rotation of the gear 504, the rotary kiln body 1 is rotated through the meshing transmission between the gear 504 and the ring rack 501. Through the rotation of the rotary kiln body 1, the raw material to be processed is transported to the interior of the kiln head 2 for processing. During the rotation of the rotary kiln body 1, each mounting plate 401 supports each rotating ring 402, which facilitates the more stable rotation of the rotary kiln body 1. After the raw material is transported to the interior of the kiln head 2, it is heated by the kiln head 2.

[0036] Then, during the processing, the rotary kiln body 1 and the kiln head 2 are double-sealed and protected by the graphite block sealing ring 6 and the protective box 7. During the combustion process inside the kiln head 2, the internal pressure squeezes and pushes the graphite block sealing ring 6 towards the inside of the kiln head 2. During the processing, because the inside of the kiln head 2 is in a high-temperature state, the internal pressure of the kiln head 2 pushes the piston 1102 away from the kiln head 2 inside the sealing box 1101. During the movement of the piston 1102, the operating rod 902 at the other end of the drive rod 901 moves synchronously. During the movement of the operating rod 902, the interaction between the conical groove 903 and the transmission plate 904 pushes the drive ring 803 to move under force. Therefore, the annular plate 802 rotates synchronously with the rotation of the rotary kiln body 1. The drive ring 803 moves towards the protective box 7 through the meshing transmission between the drive ring 803 and the annular plate 802. During the movement of the drive ring 803, the rubber plate 804 on the drive ring 803 pushes the sealing piston plate 801 at the other end of the transmission rod 805 to slide inside the protective box 7. During the movement of the sealing piston plate 801, the pressure on the side of the sealing piston plate 801 close to the graphite block sealing ring 6 increases. Under the action of the pressure inside the protective box 7, the other side of the graphite block sealing ring 6 is pushed. The axial force on both sides of the graphite block sealing ring 6 pushes the graphite block sealing ring 6 simultaneously, avoiding uneven axial force on the graphite block sealing ring 6, which would cause axial movement of the graphite block sealing ring 6 and aggravate wear. This improves the sealing effect of the graphite block sealing ring 6 in the rotary kiln processing process.

[0037] During the sealing process, the position of the drive rod 901 is monitored and identified by the proximity switch 12 on the mounting plate 401. When a large gap appears in the graphite block sealing ring 6 inside the protective box 7, causing insufficient sealing, the sealing piston plate 801, during its pushing process, forces some of the gas inside the protective box 7 out through the gap between the graphite block sealing ring 6 and the protective box 7. This causes the sealing piston plate 801 to be unable to be limited by the sealing pressure inside the protective box 7 after being subjected to force. At this time, the drive rod 901 will continue to move under the pressure inside the kiln head 2. As the drive rod 901 continues to move, when one end of the drive rod 901 moves out of the proximity detection distance of the proximity switch 12, the proximity switch 12 will light up to remind the user. The light reminder of the proximity switch 12 makes it easy to identify whether there is a gap between the graphite block sealing ring 6 and the inside of the protective box 7, and further facilitates the precise control of the timing of replacing the graphite block sealing ring 6, which is conducive to the effective protection of the graphite block sealing ring 6.

[0038] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications and substitutions should be covered within the scope of the claims of the present invention. Technical aspects, shapes, and structures not described in detail in this invention are all well-known technologies.

Claims

1. A double-sealing structure for a rotary kiln, characterized in that: The system includes a rotary kiln body (1) and a kiln head (2). The rotary kiln body (1) is inclined toward the inside of the kiln head (2). The kiln head (2) is provided with a support plate (3) for supporting the rotary kiln body (1). The support plate (3) is provided with multiple support components for supporting the rotation of the kiln head (2). The support plate (3) is provided with a drive mechanism for driving the rotary kiln body (1) during use. A graphite block sealing ring (6) is fitted on the rotary kiln body (1). The graphite block sealing ring (6) is installed on the kiln head (2). A protective box (7) is installed on the kiln head (2) for sealing and protecting the graphite block sealing ring (6). The protective box (7) is provided with a sealing mechanism for axially pushing and sealing the graphite block sealing ring (6). The sealing mechanism includes a sealing piston plate (801) slidably connected inside the protective box (7). The sealing piston plate (801) is matched with the interior of the protective box (7). An annular plate (802) is fixed on the side wall of the rotary kiln body (1). A drive ring (803) is threadedly connected to the outer side wall of the annular plate (802). A rubber plate (804) is provided on the side of the drive ring (803) facing the kiln head (2). A transmission rod (805) is fixed on the sealing piston plate (801). The other end of the transmission rod (805) passes through the protective box (7) and abuts against the rubber plate (804). A transmission mechanism for driving the drive ring (803) is provided inside the kiln head (2). A detection mechanism for detecting and identifying the sealing effect inside the protective box (7) is provided on the support plate (3). The transmission mechanism includes a drive rod (901) slidably connected to the kiln head (2). The kiln head (2) is provided with a guide assembly for guiding the movement of the drive rod (901). An operating rod (902) is fixed to one end of the drive rod (901). A conical groove (903) is provided on the side wall of the operating rod (902). A transmission plate (904) is fixed on the side wall of the drive ring (803). The transmission plate (904) abuts against the conical groove (903). A pulling mechanism for pulling the drive rod (901) is provided inside the kiln head (2). The support assembly includes multiple mounting plates (401) fixed on the support plate (3). Each mounting plate (401) has an arc-shaped groove at its upper end. Multiple rotating rings (402) are fixed on the side wall of the rotary kiln body (1). Each rotating ring (402) is rotatably connected to the arc-shaped groove. The driving mechanism includes an annular rack (501) mounted on the side wall of the rotary kiln body (1), a U-shaped plate (502) fixed on the support plate (3), a drive motor (503) mounted on the U-shaped plate (502), a gear (504) fixed to the conveying end of the drive motor (503), and the gear (504) and the annular rack (501) being matched and configured to match each other. The detection mechanism includes a proximity switch (12) mounted on a mounting plate (401) for detecting and identifying the position of the drive rod (901).

2. The double-sealing structure of a rotary kiln according to claim 1, characterized in that: The guide assembly includes fixed plates (1001) fixed on both sides of the drive rod (901), and guide rods (1002) are slidably connected on the two fixed plates (1001). One end of the guide rod (1002) is fixed to the side wall of the kiln head (2).

3. The double-sealing structure of a rotary kiln according to claim 1, characterized in that: The pulling mechanism includes a sealing box (1101) installed on one side of the kiln head (2). One end of the drive rod (901) is located inside the sealing box (1101) and a piston (1102) is fixed thereon. The piston (1102) is slidably connected inside the sealing box (1101). The piston (1102) and the interior of the sealing box (1101) are matched and configured to match each other.

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