Simple inspection manhole device for heat treatment furnace

Abstract

The utility model relates to the technical field of thermal treatment furnace manholes, in particular to a simple inspection manhole device for a thermal treatment furnace, which comprises a furnace body structure, a flange connecting structure, a manhole cover and an opening and closing mechanism. The flange is a welding flange with a heat-resistant coating, the manhole cover has heat insulation and main and auxiliary sealing design, and the opening and closing mechanism comprises a heavy high-temperature-resistant hinge, an air spring booster and a safety locking device with a self-locking function and a standby bolt. The heat treatment furnace manhole solves the problems that when an existing heat treatment furnace manhole is overhauled, the disassembly and assembly procedures are complex, the heat preservation and sealing performance of a furnace area are poor, operation is inconvenient, and safety is insufficient.

Description

Technical Field

[0001] This utility model relates to the field of manhole technology for heat treatment furnaces, specifically to a simple maintenance manhole device for heat treatment furnaces. Background Technology

[0002] In the operation and maintenance of heat treatment furnaces, inspection manholes are an indispensable and important component. Heat treatment furnaces typically operate in high-temperature and high-pressure environments, and the internal heat treatment processes impose extremely strict requirements on parameters such as temperature and pressure within the furnace. To facilitate inspection, maintenance, and cleaning of the furnace's interior, inspection manholes are necessary.

[0003] Existing manhole devices for heat treatment furnaces often require multiple tools and cumbersome steps to open and close. For example, some traditional manhole devices use numerous ordinary bolts for fastening, requiring individual loosening and tightening during disassembly and reassembly, which is time-consuming, labor-intensive, and increases the workload of operators. Furthermore, the sealing structure of existing manhole devices is often inadequate. Firstly, the choice of sealing materials may be unsuitable; some materials cannot withstand the high-temperature environment inside the heat treatment furnace, leading to aging, deformation, and decreased sealing performance. This results in heat loss, affecting the stability and quality of the heat treatment process. Secondly, the clamping method between the manhole cover and the flange may be unscientific, failing to create an effective seal and further exacerbating the poor insulation of the furnace area. Finally, the existing manhole cover opening and closing mechanism is not user-friendly and is difficult to operate. For example, some hinge systems have insufficient load-bearing capacity, which can easily cause jamming or shaking when opening and closing the manhole cover, increasing the difficulty of operation; at the same time, the lack of reliable safety locking devices may cause the manhole cover to loosen after it is closed, posing a hidden danger to the safe operation of the heat treatment furnace. Utility Model Content

[0004] The technical problem this invention aims to solve is that the existing heat treatment furnace manholes have complex disassembly and assembly procedures during maintenance, poor furnace insulation and sealing, inconvenient operation, and insufficient safety.

[0005] To solve the above problems, the technical solution adopted by this utility model is a simple maintenance manhole device for a heat treatment furnace, including a furnace body structure, a flange connection structure, a manhole cover, and an opening and closing mechanism. The flange connection structure adopts a welded flange, the material of which is a material with a heat-resistant coating, and the wall thickness of the welded flange is 10-12mm, which is selected according to the furnace body pressure and temperature.

[0006] The manhole cover is made of the same material as the furnace body or of heat-resistant steel, and is lined with a 50mm thick ceramic fiber insulation layer. The manhole cover is equipped with a main seal and an auxiliary seal. The main seal uses a metal spiral wound gasket with a temperature resistance of ≥1000℃, and the auxiliary seal uses a high-temperature silicone strip with a temperature resistance of ≤300℃ for use in normal pressure environments. The manhole cover is fastened to the flange by quick-opening clamps or bolts, with the bolts made of heat-resistant alloy material.

[0007] The opening and closing mechanism includes a hinge system, a gas spring assist, and a safety locking device. The hinge system is a heavy-duty high-temperature resistant hinge made of 2520 stainless steel and equipped with a self-lubricating bearing. The gas spring assist is a high-temperature resistant model with an operating temperature of ≤200℃, used to assist in lifting the manhole cover. The safety locking device includes an eccentric wheel quick-opening mechanism, which can be operated with one hand and has a self-locking function. It also has a spare manual bolt for reinforcing the seal in an emergency.

[0008] As a further embodiment of this invention: the heat-resistant coating of the welded flange is uniformly covered on the flange surface to improve the heat resistance of the flange and ensure that it can be used for a long time in the high-temperature environment of the heat treatment furnace without damage.

[0009] As a further embodiment of this utility model: the outer surface of the manhole cover is covered with ceramic fiber cloth to reduce the external temperature to ≤60℃. The ceramic fiber heat insulation layer of the manhole cover lining is tightly bonded to the manhole cover by bonding or mechanical fixing, ensuring that the heat insulation layer will not fall off during the operation of the heat treatment furnace, and effectively preventing the heat inside the furnace from being transferred to the outside of the manhole cover.

[0010] As a further aspect of this utility model: the quick-opening clamp is made of high-strength alloy material, and its structural design can quickly and firmly press the manhole cover and flange together, and is easy to operate; the number and distribution of bolts for bolt fastening are reasonably designed according to the size of the manhole cover and the furnace pressure to ensure the sealing effect.

[0011] As a further aspect of this utility model: the eccentric wheel of the eccentric wheel quick-opening mechanism is closely matched with related components, the self-locking function is reliable, and the opening and closing of the manhole cover can be easily achieved by one-handed operation; the number and specifications of the spare manual bolts can meet the requirements of emergency reinforcement and sealing, and in the event of failure of the gas spring or other emergency, the sealing of the manhole device can be ensured by manually tightening the bolts.

[0012] Compared with the prior art, the advantages of this utility model are as follows: The simple maintenance manhole device for the heat treatment furnace of this application adopts a quick-opening clamp or bolt fastening method. In particular, the design of the quick-opening clamp can quickly and firmly press or separate the manhole cover from the flange, which greatly simplifies the disassembly and assembly process and reduces the working time and labor intensity of the operators. Meanwhile, the eccentric wheel quick-opening mechanism allows for one-handed operation and features a self-locking function, further enhancing ease of operation. The main seal uses a metal spiral wound gasket with a temperature resistance of ≥1000℃, capable of withstanding the high-temperature environment inside the heat treatment furnace and ensuring good sealing performance even at high temperatures. The auxiliary seal uses a high-temperature silicone strip with a temperature resistance of below 300℃, suitable for atmospheric pressure environments, further enhancing the sealing effect. The manhole cover is lined with a 50mm thick ceramic fiber insulation layer, effectively preventing heat transfer from the furnace to the outside of the manhole cover. The outer surface of the manhole cover is covered with ceramic fiber cloth, which can reduce the external temperature to ≤60℃, reducing heat loss and improving the insulation performance of the furnace area. The heavy-duty high-temperature resistant hinge with a self-lubricating bearing ensures smooth opening and closing of the manhole cover. The gas spring assist can help lift the manhole cover, further reducing the burden on operators. The self-locking function of the eccentric wheel quick-opening mechanism and the provision of a spare manual bolt ensure the firmness of the manhole cover after closing. Even in the event of gas spring failure or other emergencies, the seal can be reinforced by manually tightening the bolt, improving the safety of the device. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0014] Figure 1 This is a schematic diagram of the overall structure of a simple maintenance manhole device for a heat treatment furnace according to this utility model.

[0015] Figure 2 This is an enlarged view of section A of the simplified maintenance manhole device for a heat treatment furnace according to this utility model.

[0016] In the attached image:

[0017] 1. Welded flange; 2. Manhole cover; 3. Hinge system; 4. Gas spring assist; 5. Furnace body structure; 6. Safety locking device. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] This utility model provides a technical solution to address the existing problems mentioned in the background art.

[0020] Combined with appendix Figure 1 It can be seen that the simplified maintenance manhole device of this heat treatment furnace mainly consists of the furnace body structure 5, the flange connection structure, the manhole cover 2, and the opening and closing mechanism. First, the welded flange 1 with a heat-resistant coating is welded to the furnace body structure 5. The wall thickness of the welded flange 1 is selected as 10-12mm according to the furnace pressure and temperature to ensure its strength and stability under high temperature and high pressure conditions. The heat-resistant coating is evenly applied to the flange surface to improve the flange's heat resistance.

[0021] The manhole cover 2 is made of the same material as the furnace body or heat-resistant steel, such as 310S stainless steel. The manhole cover 2 is lined with a 50mm thick ceramic fiber insulation layer, which is tightly bonded to the manhole cover 2 by adhesive or mechanical fixation to ensure it will not detach during furnace operation. The outer surface of the manhole cover 2 is covered with ceramic fiber cloth, effectively reducing the external temperature to ≤60℃. The manhole cover 2 is equipped with a main seal and an auxiliary seal. The main seal uses a metal spiral wound gasket with a temperature resistance of ≥1000℃, while the auxiliary seal uses a high-temperature silicone strip with a temperature resistance of below 300℃ for use in normal pressure environments. The manhole cover 2 can be tightened to the flange using quick-opening clamps or bolts, with the bolts made of heat-resistant alloy material. If quick-opening clamps are used, they are made of high-strength alloy material, and their structural design allows for quick and secure tightening of the manhole cover 2 to the flange, while also being easy to operate.

[0022] The opening and closing mechanism includes a hinge system 3, a gas spring assist 4, and a safety locking device 6. The hinge system 3 is a heavy-duty, high-temperature resistant hinge made of 2520 stainless steel and equipped with a self-lubricating bearing. It is installed between the manhole cover 2 and the furnace body structure 5 to ensure smooth opening and closing of the manhole cover 2. The gas spring assist 4 is a high-temperature resistant model with an operating temperature ≤200℃. It is installed near the hinge system 3 to assist in lifting the manhole cover 2, reducing the operator's workload. The safety locking device 6 includes an eccentric wheel quick-opening mechanism. The eccentric wheel of the quick-opening mechanism fits tightly with related components, ensuring reliable self-locking. The manhole cover 2 can be easily opened and closed with one hand. A spare manual bolt is also provided for emergency reinforcement and sealing to ensure the safety of the device.

[0023] The working principle of this application is as follows: When it is necessary to open the manhole cover 2 for maintenance, if an eccentric wheel quick-opening mechanism is used, the operator operates the eccentric wheel with one hand to rotate it, releasing the self-locking function. Then, under the assistance of the gas spring 4, the manhole cover 2 is lifted, and the operator can easily open the manhole cover 2 around the hinge system 3. If a quick-opening clamp is used, the operator only needs to loosen the clamp, and the manhole cover 2 can be opened with the help of the gas spring 4. If a bolt fastening method is used, the operator needs to loosen the heat-resistant alloy bolts one by one before opening the manhole cover 2.

[0024] After maintenance, close the manhole cover 2 around the hinge system 3 until it is flush with the flange. If a quick-opening clamp is used, the operator quickly tightens the clamp to press the manhole cover 2 against the flange; if bolt fastening is used, the operator tightens each heat-resistant alloy bolt individually. Simultaneously, the main seal's spiral wound gasket and the auxiliary seal's high-temperature silicone strip begin to function, ensuring a tight seal between the manhole cover 2 and the flange. Finally, operate the eccentric wheel quick-opening mechanism to self-lock, further reinforcing the seal. In case of emergency, the seal can be reinforced using spare manual bolts to ensure the safe operation of the heat treatment furnace.

[0025] The main seal's spiral wound gasket can withstand the high-temperature environment inside the heat treatment furnace, and its excellent elasticity and sealing performance effectively prevent leakage of the furnace medium. The high-temperature silicone strip for the auxiliary seal further enhances the sealing effect under normal pressure. The ceramic fiber insulation layer lining the manhole cover 2 effectively prevents heat from the furnace from being transferred to the outside of the manhole cover 2, while the ceramic fiber cloth on the outer surface of the manhole cover 2 further reduces the external temperature, minimizes heat loss, and improves the thermal insulation performance of the furnace area.

[0026] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A simple maintenance manhole device for a heat treatment furnace, characterized by: The manhole cover (2) is made of the same material as the furnace body or heat-resistant steel, and is lined with a 50mm-thick ceramic fiber heat insulation layer; the manhole cover (2) is provided with main sealing and auxiliary sealing, the main sealing adopts a metal winding gasket with a temperature resistance of ≥1000℃, and the auxiliary sealing adopts a high-temperature silica gel strip with a temperature resistance of below 300℃, which is used in normal pressure environment; the manhole cover (2) and the flange are pressed by quick-opening clamps or bolts, wherein the bolts are made of heat-resistant alloy material; The opening and closing mechanism includes a hinge system (3), a gas spring booster (4) and a safety locking device (6); the hinge system (3) is a heavy-duty high-temperature-resistant hinge made of 2520 stainless steel and provided with self-lubricating bearings; the gas spring booster (4) is selected from a high-temperature-resistant type, which has a working temperature of ≤200℃ and is used to assist lifting of the manhole cover (2); the safety locking device (6) includes an eccentric wheel quick-opening mechanism, which can be operated by one hand and has a self-locking function, and is also provided with a backup manual bolt for emergency sealing reinforcement. The heat-resistant coating of the welding flange (1) is evenly covered on the surface of the flange.

2. The simple maintenance manhole device for a heat treatment furnace according to claim 1, characterized by: The manhole cover (2) is coated with ceramic fiber cloth on the outer surface to reduce the external temperature to ≤60℃, and the ceramic fiber heat insulation layer lining the manhole cover (2) is tightly combined with the manhole cover (2) by bonding or mechanical fixing.

3. The simple maintenance manhole device for a heat treatment furnace according to claim 1, characterized by: The quick-opening clamp is made of high-strength alloy material, and its structure design can quickly and firmly press the manhole cover (2) and the flange, and is convenient to operate.

4. The simple maintenance manhole device for a heat treatment furnace according to claim 1, characterized by: The eccentric wheel of the eccentric wheel quick-opening mechanism is tightly matched with related components, the self-locking function is reliable, and the opening and closing of the manhole cover (2) can be easily realized by one-handed operation.

5. The simple maintenance manhole device for a heat treatment furnace according to claim 1, characterized by: ​

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