A sealing device for a furnace observation port

Abstract

This utility model discloses a sealing device for observation holes in a kiln, relating to the field of sealing technology in glass production. It includes a kiln wall; observation hole bricks symmetrically arranged inside the kiln wall; a fixed outer shell disposed on the outer wall of the two sets of observation hole bricks and located on one side of the kiln wall; a cylinder disposed on one side of the fixed outer shell; a sealing cap disposed at one end of the cylinder; a snap-fit ​​assembly symmetrically disposed at both ends of the fixed outer shell and cooperating with the observation hole bricks, achieving rapid positioning between the fixed outer shell and the observation hole bricks to ensure stability and convenience during installation; a steel component disposed on one side of the top of the kiln wall; a pulley assembly disposed on the top of the steel component and cooperating with the sealing cap, achieving linkage guidance between the steel component and the sealing cap; and a counterweight disposed at the end of the pulley assembly. This utility model has a reasonable and reliable structure, effectively solving the problem of fire leakage from the observation hole bricks in the kiln through the 45-degree embedded sealing of the sealing cap and the inclined side of the cylinder.

Description

Technical Field

[0001] This utility model relates to the field of glass production sealing technology, specifically to a sealing device for a kiln observation hole. Background Technology

[0002] Glass kilns are constructed from various refractory materials, and necessary sections have observation holes for production personnel to inspect the internal flames, refractory materials, and other operational status. Due to process requirements, the pressure at these observation holes is generally positive. Under positive pressure, heat dissipates from the kiln through these holes, increasing energy loss. Conversely, if negative pressure occurs, cold air from the outside will enter through the observation holes, lowering the kiln temperature and disrupting the kiln's atmosphere. Therefore, it is necessary to improve the sealing of these holes to control energy loss, prevent unnecessary heat dissipation, and indirectly save fuel consumption. Traditionally, heat dissipation control for observation holes mostly involves simple sealing with fiberglass wool or conical clay bricks. The sealing effect is generally poor, and observation is cumbersome and inconvenient. Furthermore, inadequate sealing increases the heat radiation from the flame, causing damage to the observation hole bricks and surrounding insulation materials, shortening their lifespan and reducing their insulation effectiveness. Additionally, traditional sealing methods require frequent maintenance and replacement, often increasing the difficulty of disassembly for operators.

[0003] While existing observation hole sealing mechanisms utilize the inclined structure of the door block and the observation hole plug to achieve a seal based on the weight of the plug itself, the outer casing is prone to damage and inconvenient to replace during long-term use, increasing the maintenance burden on staff. Furthermore, in situations requiring frequent observation or continuous operation, the sealing cover is difficult to secure quickly, further reducing work efficiency.

[0004] No effective solutions have yet been proposed to address the problems in the relevant technologies. Utility Model Content

[0005] In view of the problems in the related technologies, this utility model proposes a sealing device for the observation hole of a kiln to overcome the above-mentioned technical problems existing in the existing related technologies.

[0006] Therefore, the specific technical solution adopted by this utility model is as follows:

[0007] A sealing device for observation holes in a kiln includes a kiln wall; observation hole bricks symmetrically arranged inside the kiln wall; a fixed outer shell disposed on the outer wall of the two sets of observation hole bricks and located on one side of the kiln wall; a cylinder disposed on one side of the fixed outer shell; a sealing cover disposed at one end of the cylinder; a snap-fit ​​assembly symmetrically disposed at both ends of the fixed outer shell and cooperating with the observation hole bricks, and the snap-fit ​​assembly enables quick positioning between the fixed outer shell and the observation hole bricks to ensure stability and convenience during installation; a steel component disposed on one side of the top of the kiln wall; a pulley assembly disposed on the top of the steel component and cooperating with the sealing cover, and the pulley assembly enables linkage guidance between the steel component and the sealing cover; and a counterweight disposed at the end of the pulley assembly.

[0008] Furthermore, in order to help guide the line of sight and expand the observation angle, and also to reduce the direct impact of high-temperature airflow on the sealing structure, a semi-circular groove is provided on one side of the observation hole brick. Two sets of semi-circular grooves are combined to form the observation hole brick hole, and the end of the observation hole brick hole away from the fixed shell is set with a conical structure.

[0009] Furthermore, to provide a more stable installation foundation, the thickness of the kiln wall is less than the thickness of the observation hole bricks.

[0010] Furthermore, in order to reduce thermal stress concentration and improve the overall thermal stability and service life of the structure, the inner diameter of the cylinder is larger than the inner diameter of the observation hole brick, and the difference between the two is set to 1cm.

[0011] Furthermore, to improve the efficiency of installing and disassembling the fixed housing, the snap-fit ​​assembly includes several rectangular slots symmetrically arranged at both ends of the fixed housing. A fixing plate is symmetrically arranged at both ends of each rectangular slot, and a rectangular slot is formed inside the fixing plate. A spring is arranged inside the rectangular slot and between the two fixing plates. A movable plate that cooperates with the rectangular slot is arranged on the side of the spring closest to the observation hole brick. A push rod is arranged at the end of the movable plate away from the observation hole brick, and a connecting rod is connected to one end of each of the two push rods. A snap-fit ​​block is arranged at the end of the movable plate closest to the observation hole brick, and the snap-fit ​​block has a trapezoidal structure.

[0012] Furthermore, in order to facilitate quick disassembly and installation when maintenance or replacement is required, both sets of observation hole bricks are provided with snap-fit ​​grooves on both sides to cooperate with the snap-fit ​​blocks.

[0013] Furthermore, in order to improve the safety and reliability of the device in high-temperature environments, one end of the cylinder is set at a 45-degree angle to the horizontal plane; and the inclined side of the cylinder is set with an arc-shaped structure.

[0014] Furthermore, in order to prevent the high-temperature gas inside the kiln from leaking out, a mounting plate is provided at one end of the sealing cover, and one end of the mounting plate is movably connected to one end of the fixed outer shell; a wire ring and a sealing gasket are respectively provided at the top and bottom of the sealing cover, and the sealing gasket is embedded in the cylinder.

[0015] Furthermore, in order to achieve balanced control and stable opening and closing of the sealing cover, the pulley assembly includes two sets of fixed pulleys set on the top of the steel part; a movable pulley is set on the top of the wire ring; a wire rope is set at the bottom of one set of fixed pulleys, and the wire rope passes around the movable pulley, the two sets of fixed pulleys and connects to the counterweight in sequence.

[0016] Furthermore, in order to prevent the leakage of high-temperature gas inside the kiln, an annular snap-fit ​​groove is provided on one side of the fixed outer shell, and an elastic sealing ring is provided on one side of the annular snap-fit ​​groove.

[0017] The beneficial effects of this utility model are as follows:

[0018] 1. This utility model features a reasonable and reliable structure and simple operation. The 45-degree embedded seal between the sealing cover and the inclined edge of the cylinder effectively solves the problem of fire leakage from the kiln observation hole bricks and the ingress of low-temperature gas, while reducing damage to the observation hole bricks, stabilizing the kiln pressure, and saving energy. Simultaneously, the snap-fit ​​assembly adopts a quick-release design, making the inspection, cleaning, and replacement of the fixed outer shell more efficient and convenient, reducing maintenance time and labor costs, especially suitable for conditions requiring frequent observation of the kiln's internal condition. Maintenance or replacement work can be completed without interfering with the normal operation of other systems, minimizing equipment downtime and effectively ensuring the efficient and stable operation of the production line. Furthermore, the linkage structure between the pulley block and the wire rope enables remote control of the sealing cover, allowing operators to open the cover without approaching the high-temperature area, improving operational safety and user-friendly experience.

[0019] 2. This utility model, by incorporating a snap-fit ​​assembly, addresses the high maintenance frequency of the observation port's fixed outer casing during float glass furnace operation, especially when continuous monitoring of the furnace's internal condition is required. The easy-to-disassemble design not only allows workers to quickly complete inspection, cleaning, and replacement operations but also reduces maintenance time and labor costs, while simultaneously improving daily operational efficiency. Furthermore, minimizing equipment downtime is crucial for ensuring production continuity. The quick-release structure allows for efficient inspection or replacement of the fixed casing without affecting other systems, thereby minimizing maintenance cycles and ensuring the stable and efficient continuous operation of the production line.

[0020] 3. This utility model, by incorporating a pulley assembly and a wire rope for remote control of the sealing cover's opening, allows operators to complete the operation without approaching the high-temperature area of ​​the kiln, effectively avoiding safety risks associated with high-temperature environments and enhancing the humanization and safety of the work process. When prolonged observation or maintenance is required, simply increasing the weight of the counterweight ensures stable fixation of the sealing cover, preventing accidental closure due to external interference, thereby further guaranteeing operational stability and continuity. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a kiln observation hole sealing device according to an embodiment of the present utility model;

[0023] Figure 2 This is a partial cross-sectional view of a kiln observation hole sealing device according to an embodiment of the present utility model;

[0024] Figure 3 This is a cross-sectional view of a kiln observation hole sealing device according to an embodiment of the present utility model;

[0025] Figure 4 This is a cross-sectional view of the snap-fit ​​component in a kiln observation hole sealing device according to an embodiment of the present utility model.

[0026] In the picture:

[0027] 1. Kiln wall; 2. Observation hole brick; 201. Semicircular groove; 202. Observation hole brick hole; 3. Fixed outer shell; 4. Cylinder; 5. Sealing cover; 6. Snap-fit ​​assembly; 601. Rectangular groove one; 602. Fixing plate; 603. Rectangular groove two; 604. Spring; 605. Movable plate; 606. Push rod; 607. Connecting rod; 608. Snap-fit ​​block; 7. Steel parts; 8. Pulley assembly; 801. Fixed pulley; 802. Movable pulley; 803. Steel wire rope; 9. Counterweight block; 10. Snap-fit ​​groove; 11. Mounting long plate; 12. Steel wire ring; 13. Sealing gasket; 14. Annular snap-fit ​​groove; 15. Elastic sealing ring. Detailed Implementation

[0028] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0029] According to an embodiment of the present invention, a sealing device for a kiln observation hole is provided.

[0030] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figures 1-4 As shown, a kiln observation hole sealing device according to an embodiment of the present utility model includes a kiln wall 1; observation hole bricks 2, symmetrically arranged inside the kiln wall 1; a fixed outer shell 3, arranged on the outer wall of the two sets of observation hole bricks 2 and located on one side of the kiln wall 1; a cylinder 4, arranged on one side of the fixed outer shell 3; a sealing cover 5, arranged at one end of the cylinder 4; a snap-fit ​​assembly 6, symmetrically arranged at both ends of the fixed outer shell 3 and cooperating with the observation hole bricks 2, and realizing quick positioning between the fixed outer shell 3 and the observation hole bricks 2 through the snap-fit ​​assembly 6 to ensure stability and convenience during installation; a steel part 7, arranged on the top side of the kiln wall 1; a pulley assembly 8, arranged on the top of the steel part 7 and cooperating with the sealing cover 5, and realizing linkage guidance between the steel part 7 and the sealing cover 5 through the pulley assembly 8; and a counterweight 9, arranged at the end of the pulley assembly 8.

[0031] By utilizing the aforementioned technical solution of this utility model, the 45-degree embedded sealing between the sealing cover 5 and the inclined side of the cylinder 4 effectively solves the problem of fire leakage from the kiln observation hole 202 and the ingress of low-temperature gas, while reducing burn damage to the observation hole brick 2, stabilizing the kiln pressure system, and saving energy. Simultaneously, the snap-fit ​​component 6 adopts a quick-release design, making the inspection, cleaning, and replacement of the fixed outer shell 3 more efficient and convenient, reducing the time and labor costs required for maintenance, especially suitable for operating conditions requiring frequent observation of the kiln's internal condition. Maintenance or replacement operations can be completed without interfering with the normal operation of other systems, minimizing equipment downtime and effectively ensuring the efficient and stable operation of the production line. Furthermore, the linkage structure between the pulley block and the wire rope 803 enables remote control of the sealing cover 5, allowing operators to open the cover without approaching the high-temperature area, improving operational safety and user-friendly experience.

[0032] It should be explained that the fixed housing 3 is made of iron through welding, which ensures the overall structural strength and sealing of the fixed housing, so that it remains stable and reliable under long-term high temperature environment;

[0033] Both the sealing gasket 13 and the elastic sealing ring 15 are made of ceramic fiber composite material. Ceramic fiber composite material not only has excellent high temperature resistance, but also good corrosion resistance and wear resistance, ensuring that it can maintain high-efficiency sealing performance even after long-term use.

[0034] In one embodiment, for the observation hole brick 2, a semi-circular groove 201 is formed on one side of the observation hole brick 2. Two sets of semi-circular grooves 201 are combined to form the observation hole brick hole 202, and the end of the observation hole brick hole 202 away from the fixed housing 3 is set with a conical structure. The conical design helps to guide the direction of sight, expands the observation angle, and also helps to reduce the direct impact of high-temperature airflow on the sealing structure, thereby improving the safety and structural stability of the device in high-temperature environments.

[0035] In one embodiment, the thickness of the kiln wall 1 is less than the thickness of the observation hole brick 2. This provides a more stable installation foundation and improves the safety and reliability of the device.

[0036] In one embodiment, the inner diameter of cylinder 4 is larger than the inner diameter of the observation hole 202, and the difference between the two is set to 1 cm. This helps to reduce thermal stress concentration and improves the thermal stability and service life of the overall structure.

[0037] In one embodiment, the snap-fit ​​assembly 6 includes several rectangular slots 601 symmetrically arranged at both ends of the fixed housing 3. Fixing plates 602 are symmetrically arranged at both ends of the rectangular slots 601, and rectangular slots 603 are formed inside the fixing plates 602. A spring 604 is arranged inside the rectangular slots 601 and between the two sets of fixing plates 602. A movable plate 605, cooperating with the rectangular slots 601, is provided on the side of the spring 604 near the observation hole brick 2. A push rod 606 is provided at the end of the movable plate 605 away from the observation hole brick 2, and a connecting rod 607 is connected to one end of each set of push rods 606. A snap-fit ​​block 608 is provided at the end of the movable plate 605 near the observation hole brick 2, and the snap-fit ​​block 608 has a trapezoidal structure. This improves the efficiency of installing and disassembling the fixed housing 3 while ensuring the reliability and sealing of the connection.

[0038] The specific working principle of the snap-fit ​​assembly 6 is as follows: When the fixed housing 3 needs to be installed on the observation hole brick 2, first align the snap-fit ​​assembly 6 with the snap-fit ​​groove 10 on the observation hole brick 2, and then push it in. At this time, the trapezoidal structure of the snap-fit ​​block 608 will contact the snap-fit ​​groove 10 and gradually enter the rectangular groove 601. As it continues to advance, the snap-fit ​​block 608 moves away from the observation hole brick 2 under the action of the thrust, driving the movable plate 605 to move synchronously and compressing the spring 604. When the snap-fit ​​block 608 is fully inserted into the rectangular groove 601, the elastic force of the spring 604 pushes the movable plate 605 and the snap-fit ​​block 608 back until the snap-fit ​​block 608 is tightly engaged with the snap-fit ​​groove 10, achieving a firm fixation. During disassembly, pull the connecting rods 607 at both ends, driving the push rod 606 to move away from the snap-fit ​​groove 10. The push rod 606 pushes the movable plate 605, overcoming the elastic force of the spring 604, causing the snap-fit ​​block 608 to disengage from the snap-fit ​​groove 10. Once the snap-fit ​​block 608 is completely separated, the retaining housing 3 can be easily removed.

[0039] In one embodiment, for the observation hole bricks 2, both sides of the two sets of observation hole bricks 2 are provided with snap-fit ​​grooves 10 that cooperate with the snap-fit ​​block 608. This facilitates quick disassembly and installation when maintenance or replacement is required, improving the practicality and ease of operation of the overall device.

[0040] In one embodiment, one end of the cylinder 4 is set at a 45-degree angle to the horizontal plane; and the inclined side of the cylinder 4 is set with an arc-shaped structure. This improves the safety and reliability of the device in high-temperature environments.

[0041] In one embodiment, the sealing cover 5 has a mounting plate 11 at one end, which is movably connected to one end of the fixed outer casing 3. The top and bottom of the sealing cover 5 are respectively provided with a wire ring 12 and a sealing gasket 13, with the sealing gasket 13 embedded inside the cylinder 4. This prevents the leakage of high-temperature gas from the kiln, improving the overall safety and sealing performance of the device.

[0042] In one embodiment, the pulley assembly 8 includes two sets of fixed pulleys 801 disposed on the top of the steel component 7; a movable pulley 802 is disposed on the top of the wire ring 12; a wire rope 803 is disposed at the bottom end of one set of fixed pulleys 801, and the wire rope 803 passes sequentially around the movable pulley 802 and the two sets of fixed pulleys 801 and is connected to the counterweight 9. This achieves balanced control and stable opening and closing of the sealing cover 5.

[0043] The specific working principle of pulley assembly 8 is as follows: The weight of counterweight 9 is half the weight of sealing cover 5. When no external force is applied, counterweight 9 remains stationary due to its own weight, keeping wire rope 803 taut. Movable pulley 802 also maintains a stable position under the tension of wire rope 803, and the entire pulley assembly 8 is in a balanced state. When it is necessary to open sealing cover 5, the operator pulls wire rope 803, causing movable pulley 802 to move upwards under the tension. Since movable pulley 802 is connected to wire ring 12, wire ring 12 is lifted, thereby opening sealing cover 5, enabling remote operation for observation. When long-term observation or maintenance is required, simply increasing the mass of counterweight 9 will ensure stable fixation of sealing cover 5, preventing accidental closure due to external interference, thus further ensuring the stability and continuity of operation.

[0044] In one embodiment, the fixed housing 3 has an annular snap-fit ​​groove 14 on one side of its interior, and an elastic sealing ring 15 is provided on one side of the annular snap-fit ​​groove 14. This effectively prevents the leakage of high-temperature gas inside the kiln and improves the sealing performance.

[0045] To facilitate understanding of the above-mentioned technical solutions of this utility model, the working principle or operation method of this utility model in actual process will be described in detail below.

[0046] like Figures 1-4As shown, in practical application, firstly, the workers install the observation hole brick 2 on the kiln wall 1. Since the thickness of the kiln wall 1 is less than the thickness of the observation hole brick 2, the brick 2 can be partially embedded in the wall, thus improving the structural stability and sealing performance. A semi-circular groove 201 is formed on one side of the observation hole brick 2; two sets of semi-circular grooves 201 fit together to form a complete observation hole 202. This channel is used to observe the internal working conditions of the kiln. The end of the observation hole 202 away from the fixed outer shell 3 is designed with a conical structure, which helps guide the line of sight and effectively reduces the direct impact of high-temperature airflow on the sealing structure, improving the safety and stability of the device in high-temperature environments. Subsequently, the fixed outer shell 3 and the observation hole brick 2 are quickly connected and disconnected using the snap-fit ​​assembly 6. The fixed outer shell 3 has an elastic sealing ring 15 inside; during assembly, the squeezing force of the snap-fit ​​assembly 6 further seals the observation hole channel, improving the overall sealing effect. The pulley assembly 8 includes a movable pulley 802, a fixed pulley 801, and a wire rope 803. A counterweight 9 is connected to the pulley system via the wire rope. When no external force is applied, the counterweight 9 remains stationary due to its own weight, keeping the wire rope 803 taut and the movable pulley 802 in a stable position, thus maintaining the entire pulley system in a balanced state. When the sealing cover 5 needs to be opened, the operator pulls the wire rope 803, causing the movable pulley 802 to move upwards, thereby lifting the connected wire ring 12 and enabling remote opening of the sealing cover 5. The sealing cover 5 has a sealing gasket 13 at its bottom, providing a good seal when closed to prevent leakage of high-temperature gas from the kiln. For extended observation or maintenance, simply increasing the mass of the counterweight 9 will ensure the sealing cover 5 is stably fixed, preventing accidental closure due to external interference and ensuring the continuity and stability of the operation.

[0047] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0048] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A sealing device for a kiln observation hole, characterized in that, include: Kiln wall (1); Observe the perforated bricks (2), which are symmetrically arranged inside the kiln wall (1); The fixed outer shell (3) is set on the outer wall of the two sets of observation hole bricks (2) and located on one side of the kiln wall (1); A cylinder (4) is disposed on one side of the fixed outer shell (3); A sealing cap (5) is disposed at one end of the cylinder (4); The snap-fit ​​assembly (6) is symmetrically arranged at both ends of the fixed housing (3) and cooperates with the observation hole brick (2). The snap-fit ​​assembly (6) enables quick positioning between the fixed housing (3) and the observation hole brick (2) to ensure stability and convenience during installation. Steel component (7) is installed on one side of the top of the kiln wall (1); A pulley assembly (8) is disposed on the top of the steel part (7) and cooperates with the sealing cover (5), and the pulley assembly (8) realizes the linkage guidance between the steel part (7) and the sealing cover (5); A counterweight (9) is disposed at the end of the pulley assembly (8).

2. The kiln observation hole sealing device according to claim 1, characterized in that, The observation hole brick (2) has a semi-circular groove (201) on one side. Two sets of semi-circular grooves (201) are combined to form an observation hole brick hole (202). The end of the observation hole brick hole (202) away from the fixed shell (3) is set in a conical structure.

3. The kiln observation hole sealing device according to claim 1, characterized in that, The thickness of the kiln wall (1) is less than the thickness of the observation hole brick (2).

4. A sealing device for a kiln observation hole according to claim 2, characterized in that, The inner diameter of the cylinder (4) is larger than the inner diameter of the observation hole (202), and the difference between the two is set to 1 cm.

5. A sealing device for a kiln observation hole according to claim 1, characterized in that, The snap-fit ​​assembly (6) includes a plurality of rectangular slots (601) symmetrically arranged at both ends of the fixed housing (3), and fixed plates (602) are symmetrically arranged at both ends of the rectangular slots (601). Rectangular slots (603) are opened inside the fixed plates (602). A spring (604) is provided inside the rectangular groove (601) and between the two sets of fixing plates (602). The spring (604) is provided with a movable plate (605) that cooperates with the rectangular groove (601) on the side near the observation hole brick (2). A push rod (606) is provided at the end of the movable plate (605) away from the observation hole brick (2). A connecting rod (607) is connected to one end of the two sets of push rods (606). The movable plate (605) is provided with a snap-fit ​​block (608) at one end near the observation hole brick (2), and the snap-fit ​​block (608) is arranged in a trapezoidal structure.

6. A sealing device for a kiln observation hole according to claim 5, characterized in that, Both sets of observation hole bricks (2) have snap-fit ​​grooves (10) on both sides that cooperate with the snap-fit ​​block (608).

7. A sealing device for a kiln observation hole according to claim 1, characterized in that, One end of the cylinder (4) is set at a 45-degree angle with the horizontal plane; and the inclined side of the cylinder (4) is set in an arc shape.

8. A sealing device for a kiln observation hole according to claim 1, characterized in that, The sealing cover (5) is provided with an installation plate (11) at one end, and one end of the installation plate (11) is movably connected to one end of the fixed shell (3). The top and bottom of the sealing cap (5) are respectively provided with a wire ring (12) and a sealing gasket (13), and the sealing gasket (13) is embedded in the cylinder (4).

9. A sealing device for a kiln observation hole according to claim 8, characterized in that, The pulley assembly (8) includes two sets of fixed pulleys (801) disposed on the top of the steel part (7); The top of the wire ring (12) is fitted with a movable pulley (802). One of the fixed pulleys (801) has a steel wire rope (803) at its bottom end. The steel wire rope (803) passes around the movable pulley (802) and the two sets of fixed pulleys (801) in sequence and is connected to the counterweight (9).

10. A sealing device for a kiln observation hole according to claim 1, characterized in that, The fixed outer shell (3) has an annular snap-fit ​​groove (14) on one side inside, and an elastic sealing ring (15) is provided on one side of the annular snap-fit ​​groove (14).

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