Atmospheric pit furnace protection device and atmospheric pit furnace

Abstract

The utility model discloses a protective device for an atmospheric pit furnace. The protective device comprises a support frame, a protective circular ring and a fixing bolt, the multiple sets of supporting frames are evenly distributed in a hearth of the pit furnace. A plurality of groups of protection circular rings are uniformly arranged on the periphery of the supporting frame in a sleeving manner; the protection circular ring and the supporting frame are fixed through the fixing bolts. The protective circular ring and the supporting frame are fixed through the fixing bolts, and when the protective circular ring and the supporting frame are transported to an atmospheric pit furnace on a to-be-installed site, the protective circular ring and the supporting frame can be independently and respectively transported after being disassembled, so that transportation is convenient. Besides, fixing is achieved through the fixing bolts, high reliability can be guaranteed in the working environment with large temperature difference, meanwhile, it can be guaranteed that overhaul, maintenance, installation and replacement are convenient and fast, and therefore the problems that a casting type protection device is large in overall mass, difficult to transport and overhaul, poor in safety and the like can be solved. And the reliability of a welding spot welded and fixed by a welding type protection device in a temperature difference environment of the pit furnace is not high enough.

Description

Technical Field

[0001] The utility model relates to the field of pit furnace loading safety, in particular to an atmospheric pit furnace protection device and the atmospheric pit furnace. Background Art

[0002] Pit-type furnaces are a predominant type of boiler in today's machining operations. Their unique deep-well structure allows long shafts to be loaded vertically for heating, making them particularly suitable for heat treating various types of rods, pipes, and wire rods. Pit-type furnaces excel at sphericalizing carbon compounds in steel, effectively ensuring workpiece surface accuracy, toughness, and rigidity. They can operate with gas or liquid fuels, as well as electrical heating, offering a wide range of applications.

[0003] Due to the widespread use of pit furnaces in industrial production and their extreme working environments such as high temperature and high pressure, and the atmospheric pit furnace being one of the large-scale equipment, in actual use, in order to ensure that the workpiece does not collide with the furnace wall and components inside the furnace, a protective device is often installed in the furnace to protect the material rack from colliding with electrical components such as the resistance band inside the furnace. At present, the mainstream connection methods of protective devices are mostly casting or welding types. Both methods have certain shortcomings. Although the casting type protective device can ensure the protection strength, the overall weight is very heavy, resulting in waste of materials and energy, and it is also difficult to repair. Although the welding type protective device is flexible to repair and the overall weight is relatively light, in actual use, the thermal expansion and contraction caused by temperature changes may cause the solder joints to become desolderable, the base material may be deformed, or the strength of the material welding position may change, resulting in its protection strength being unreliable. Utility Model Content

[0004] The purpose of the utility model is to provide a novel atmospheric pit furnace protection device and an atmospheric pit furnace, so as to reduce the weight while ensuring the overall structural strength, and have the ability to quickly replace damaged parts locally.

[0005] In order to solve the above technical problems, the utility model provides an atmospheric pit type furnace protection device, comprising a support frame, a protection ring and fixing bolts;

[0006] The support frames are provided in multiple groups and are evenly distributed in the furnace of the pit furnace;

[0007] The protective rings are provided in multiple groups and are evenly sleeved on the periphery of the support frame;

[0008] The protective ring and the support frame are fixed by the fixing bolts.

[0009] Furthermore, one end of the protective device is arranged on a foundation pit made of refractory bricks at the bottom of the pit furnace.

[0010] Furthermore, the other end of the protective device is in contact with the furnace opening insulation layer without contacting the furnace opening insulation layer.

[0011] Furthermore, the protective device includes 3 to 10 protective rings, and the spacing between adjacent protective rings is the same.

[0012] Furthermore, the protective device includes 2 to 12 support frames, and the support frames are evenly fixed on the inner side of the protective ring.

[0013] Furthermore, the fixing bolts adopt a double-nut locking structure when fixing the protective ring and the support frame.

[0014] Furthermore, the protective ring is made of channel steel.

[0015] Furthermore, the support frame is made of channel steel.

[0016] On the other hand, the present invention also proposes an atmospheric pit furnace, which adopts the atmospheric pit furnace protection device as described above.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] The protective ring and the support frame are fixed by fixing bolts. When transporting to the atmospheric pit furnace to be installed at the site, the protective ring and the support frame can be disassembled and transported separately, which is convenient for transportation. In addition, the use of fixing bolts can ensure higher reliability in a working environment with a large temperature difference, and at the same time ensure that inspection, maintenance, installation and replacement are relatively convenient and quick, thereby solving the shortcomings of the cast-type protective device having a large overall mass and being difficult to transport and inspect, and the welded protective device having a low reliability of the weld points in the temperature difference environment of the pit furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the atmospheric well furnace protection device of the utility model;

[0020] Figure 2 This is a schematic diagram of the cross-sectional structure of the atmospheric well furnace protection device of the utility model;

[0021] Figure 3 Schematic diagram of the channel steel section;

[0022] Figure 4 This is a schematic diagram of a vertical cross section of the atmospheric pit furnace protection device connection;

[0023] Figure 5 It is a schematic diagram of the horizontal cross section of the atmospheric pit furnace protection device connection. DETAILED DESCRIPTION

[0024] The following is a more detailed description of the atmospheric pit furnace protection device and atmospheric pit furnace of the present invention, with reference to schematic diagrams. Preferred embodiments of the present invention are shown, and it should be understood that those skilled in the art may modify the present invention as described herein while still achieving the advantageous effects of the present invention. Therefore, the following description should be understood as a general guide for those skilled in the art and not as a limitation of the present invention.

[0025] The following paragraphs describe the present invention in more detail by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description and claims. It should be noted that the drawings are greatly simplified and not to exact scale, and are intended solely to facilitate and clearly illustrate the embodiments of the present invention.

[0026] like Figure 1 As shown, an embodiment of the present invention proposes an atmospheric shaft furnace protection device, including a support frame 1, a protection ring 2 and a fixing bolt 3.

[0027] Specifically, the support frames 1 are provided in multiple groups, which are evenly distributed in the furnace of the pit furnace. The protective device includes 2 to 12 support frames 1, and the support frames 1 are evenly fixed on the inner side of the protective ring 2. The protective device includes 3 to 10 protective rings 2, which are evenly arranged on the support frames 1. The number of the protective rings 2 and the support frames 1 can be increased according to the scale of the atmospheric pit furnace actually used. In one embodiment, as Figure 1 As shown, there are two support frames 1 and three protective rings 2; in another embodiment, as shown Figure 2 As shown, 12 support frames are used.

[0028] In this embodiment, if Figure 3 As shown, the protective ring 2 and the support frame 1 are made of channel steel, and the cross section of the material is as follows: Figure 3 As shown in the figure, channel steel, a common profile, possesses high strength and can withstand heavy loads. Its optimized cross-sectional design allows for a higher load-bearing capacity per unit weight than ordinary steel, while also effectively reducing material usage and costs. The cross-sectional design of channel steel facilitates bolted or welded connections, making installation faster than similar profiles.

[0029] Specifically, the support frame 1 and the protective ring 2 are fixed by fixing bolts 3. Figure 5As shown, the grooved surface of the support frame 1 faces the smooth surface of the protective ring 2, and the grooved surfaces of the support frame 1 and the protective ring 2 face the furnace wall. During the installation and operation of the atmospheric pit furnace, the grooved surface facing the furnace wall ensures that workpieces requiring heat treatment will not collide with the grooved edge of the support frame 1 when placed in the atmospheric pit furnace, thereby preventing damage to the workpiece. This also facilitates the processing and installation of the support frame 1 and the protective ring 2 of the protective device 4 by workers.

[0030] Specifically, since the internal environment temperature difference varies greatly when the atmospheric pit furnace is working, fixing bolts are used to fix the support frame 1 and the protective ring 2. Bolt fixing can not only achieve quick replacement when maintenance is needed, saving maintenance time. It can also solve the existing welding protection device, whose welding points are easily affected by temperature differences during the use of the pit furnace, resulting in the phenomenon of welding points being desoldered due to thermal expansion and contraction. It is precisely because the temperature difference between the inside and outside of the atmospheric pit furnace is large when it is used, so when using fixing bolts, such as Figure 5 As shown, the support frame 1 and the protective ring 2 are fixed in the form of double nuts. On the one hand, it can ensure that the workpiece to be heated can still be firmly fixed with bolts when it collides and rubs with the protective device when entering and exiting the atmospheric shaft furnace. On the other hand, it can also reduce the influence of thermal expansion and contraction on the fixing ability of the bolts.

[0031] In another specific embodiment, when installing a protective device for an atmospheric pit furnace, the length of the support frame 1 is first determined according to the height of the atmospheric pit furnace, ensuring that one end of the support frame 1 can be erected in a pre-laid foundation pit made of fireproof bricks in the atmospheric pit furnace, while the other end can maintain a certain installation gap with the furnace mouth insulation layer. Then, the number of protective rings 2 is determined according to the height of the atmospheric pit furnace and the size of the workpiece to be heated. After the determination is made, the support frame 1 and the protective ring 2 are transported into the atmospheric pit furnace by equipment respectively, and then the workers use fixing bolts to fix the support frame 1 and the protective ring 2 to assemble them into a protective device. After the assembly is completed, one end of the protective device falls into the foundation pit, and the other end rests on the furnace mouth insulation layer, and the furnace mouth insulation layer can form a certain micro gap with the protective device. After the installation is completed, the workers withdraw, and the workpiece to be heated is hoisted from the furnace mouth into the atmospheric pit furnace by a hoist, and then the furnace mouth is closed and heating begins.

[0032] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. An atmospheric pit furnace protection device, characterized in that: Includes support frame, protective ring and fixing bolts; The support frames are provided in multiple groups and are evenly distributed in the furnace of the pit furnace; The protective rings are provided in multiple groups and are evenly sleeved on the periphery of the support frame; The protective ring and the support frame are fixed by the fixing bolts.

2. The atmospheric pit furnace protection device according to claim 1, characterized in that: One end of the protective device is arranged on a foundation pit made of refractory bricks at the bottom of the pit furnace.

3. The atmospheric pit furnace protection device according to claim 1, characterized in that: The other end of the protective device is against the furnace opening insulation layer and does not contact the furnace opening insulation layer.

4. The atmospheric pit furnace protection device according to claim 1, characterized in that: The protective device includes 3 to 10 protective rings, and the distances between adjacent protective rings are the same.

5. The atmospheric pit furnace protection device according to claim 1, characterized in that: The protective device includes 2 to 12 support frames, and the support frames are evenly fixed on the inner side of the protective ring.

6. The atmospheric pit furnace protection device according to claim 1, characterized in that: The fixing bolts adopt a double-nut locking structure when fixing the protective ring and the support frame.

7. The atmospheric pit furnace protection device according to claim 1, characterized in that: The protective ring is made of channel steel.

8. The atmospheric pit furnace protection device according to claim 1, characterized in that: The support frame is made of channel steel.

9. An atmospheric pit furnace, characterized in that: The atmospheric pit furnace protection device comprises the atmospheric pit furnace protection device according to any one of claims 1-8.

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