A wind-cooled square box structure for roller hearth furnace and a method for reducing the failure rate of roller hearth furnace

Abstract

The application discloses a kind of wind-cooled square box structures for roller hearth and methods for reducing roller hearth failure rate, including two symmetrical longitudinal support beams, multiple first cross beams are connected between the two, and the ends of the two are respectively connected with second cross beams, at least one ventilation passage is formed in longitudinal support beam, air inlet air box and air outlet air box that are communicated with the ventilation passage inside longitudinal support beam are respectively mounted at the two ends of longitudinal support beam, air outlet air box tail end is connected with suction fan, longitudinal support beam side is provided with long hole for installing furnace roller group and multiple first bolt mounting holes;First cross beam and second cross beam are both hollow structure, air inlet pipe and air outlet pipe are respectively communicated and mounted at the two ends of first cross beam, air outlet pipe tail end is connected with suction fan.The structure is simple, manufacturing cost and use cost are low, on the one hand, it can ensure the normal installation of furnace roller group, on the other hand, it can greatly reduce the temperature of furnace roller group installation position, prolong its service life, and can significantly reduce the failure rate of roller hearth.

Description

Technical Field

[0001] This invention relates to the field of metal processing heat treatment equipment technology, specifically to an air-cooled square box structure for a roller hearth furnace and a method for reducing roller hearth furnace failures. The air-cooled square box is suitable for use in small roller hearth furnaces, used to install furnace roller assembly devices and support the furnace body. The use of this air-cooled square box structure can significantly reduce the failure rate of roller hearth furnaces. Background Technology

[0002] Roller hearth furnaces, also known as roller hearth heat treatment furnaces, are generally used in the metallurgical industry for continuous heat treatment processes such as annealing, normalizing, quenching and tempering, quenching and tempering of steel plates, steel pipes, structural steel and wire rods. They achieve the transfer of the steel material to be heated in the furnace through furnace rollers and their transmission devices.

[0003] For small roller hearth furnaces, the furnace chamber is smaller in size, and the size and weight of the steel to be heated are also smaller, but the heating process requirements (such as heating temperature) are the same as those for conventional roller hearth furnaces. Small roller hearth furnaces require smaller roller diameters and gaps. In this case, only modularly designed roller assemblies can meet the heating process requirements of the roller hearth furnace while also considering the requirements for roller diameter, ultra-dense roller gap, and furnace airtightness. However, this modular design requires large elongated holes to be drilled in the furnace shell for installation and fixation. The specific installation structure is as follows... Figure 1 As shown: Furnace roller group 1' (its structure is as follows) Figure 2 As shown, both sides of the roller assembly 1' are bolted to the furnace shell steel structure 2'. During installation, elongated holes need to be pre-drilled along the furnace length of the furnace shell steel structure 2' and the furnace wall 3' according to the external dimensions and installation position of the roller assembly 1'. In addition, a heat insulation plate 4' is installed on the inner side of the roller assembly 1'. During normal production of the roller hearth furnace, the temperature inside the furnace can reach up to 1150℃. Since there are no cooling measures at the contact point between the roller assembly and the furnace shell steel structure, the roller assembly and related components are exposed to a high-temperature environment for extended periods, which will lead to the following problems:

[0004] 1) The seals located at the contact point between the furnace roller assembly and the furnace shell steel structure are prone to overheating, aging, or damage, causing leakage of the furnace atmosphere;

[0005] 2) The transmission components (sprockets, chains, gears, etc.) inside the furnace roller assembly are prone to annealing in high-temperature environments, which reduces their strength and causes phenomena such as chain breakage and tooth breakage.

[0006] 3) The lubricating oil inside the furnace roller assembly evaporates and fails under high temperature conditions, seriously affecting the life of the transmission components;

[0007] 4) Under high temperature conditions, the lifespan of the drive motor is significantly reduced. Summary of the Invention

[0008] To address the problems described in the background art, this invention provides an air-cooled square box structure for a roller hearth furnace. This air-cooled square box structure is simple, with low manufacturing and operating costs. On the one hand, it ensures the normal installation of modular furnace roller assemblies; on the other hand, it significantly reduces the temperature at the installation location of the furnace roller assemblies, extending their service life. This invention also provides a method for reducing the failure rate of roller hearth furnaces using this air-cooled square box structure. During operation, hot air in the ventilation channels inside the longitudinal support beams and the first crossbeam of the air-cooled square box is replaced with cold air, reducing the operating temperature of the first crossbeam, the longitudinal support beams, and the furnace roller assemblies and related components such as seals and transmission components connected to them. This ensures the strength of the support beams under high-temperature environments and keeps the furnace roller assemblies and related components (such as seals, transmission component sprockets, chains, gears, etc.) on the mounting surface within a reasonable temperature range, effectively extending their service life. It also ensures good lubrication of the furnace roller assembly transmission components, reduces the operating temperature of the transmission motor, improves its service life, and significantly reduces the failure rate of the roller hearth furnace.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] In a first aspect, the present invention provides a wind-cooled square box structure for a roller hearth furnace, comprising two longitudinal support beams, a ventilation duct, a plurality of first crossbeams, two second crossbeams, an air inlet box, an air outlet box, an exhaust fan, an air inlet pipe, and an air outlet pipe.

[0011] Two longitudinal support beams are symmetrically arranged along the length of the roller hearth furnace, connected by multiple first crossbeams, with second crossbeams connecting to their ends. Each longitudinal support beam contains at least one ventilation duct. Inlet and outlet air boxes, connected to the internal ventilation ducts, are installed at both ends of the longitudinal support beam. An exhaust fan is connected to the end of each outlet air box. The sides of the longitudinal support beams have elongated holes for mounting the furnace roller assembly and multiple first bolt mounting holes. The size, number, and spacing of the elongated holes are determined based on the external dimensions and installation position of the furnace roller assembly. The first bolt mounting holes are used to fix the furnace roller assembly. When the exhaust fan is turned on, hot air is drawn out of the ventilation ducts in the two longitudinal support beams through the outlet air boxes, while cold air is replenished into the ventilation ducts through the inlet air boxes. This effectively reduces the temperature of the longitudinal support beams and their connected components (furnace roller assembly and related parts), increasing the strength of the support beams and improving the operating temperature and service life of the connected components.

[0012] Both the first and second crossbeams are hollow structures. Since the first crossbeam is positioned between two longitudinal support beams, where the operating temperature is high, an air inlet pipe and an air outlet pipe are connected to both ends of the first crossbeam. An exhaust fan is connected to the end of the exhaust pipe; this fan can be shared with the exhaust fans of the longitudinal support beams or installed independently. The exhaust fan removes hot air from the inside of the first crossbeam, increasing its support strength. Because the second crossbeam is positioned at both ends of the two longitudinal support beams, where the operating temperature is low, no air inlet or exhaust pipe is provided at either end of the second crossbeam.

[0013] A further improvement is that an upper ventilation channel and a lower ventilation channel are formed in the upper and lower parts of the longitudinal support beam along the length direction, respectively, and an elongated hole is opened in the middle of the outer side of the longitudinal support beam along the length direction, and a plurality of first bolt mounting holes are evenly distributed on the outside of the elongated hole.

[0014] The above structural design allows for a faster and more effective reduction in temperature of the longitudinal support beams and the furnace roller assembly and related components connected to them.

[0015] A further improvement is that multiple stiffening plates are provided inside the longitudinal support beam between the upper and lower ventilation ducts.

[0016] Specifically, stiffening plates can be arranged at intervals according to the position of the elongated holes to enhance the strength of the air-cooled air box.

[0017] A further improvement is that the upper and lower surfaces of the longitudinal support beam are respectively provided with multiple second bolt mounting holes for installing the upper furnace shell steel structure and the lower furnace shell steel structure.

[0018] A further improvement is that the upper and lower surfaces of the first and second crossbeams are respectively provided with multiple third bolt mounting holes for installing the upper furnace shell steel structure and the lower furnace shell steel structure.

[0019] Through the second bolt mounting holes on the upper and lower surfaces of the two longitudinal support beams, and the third bolt mounting holes on the upper and lower surfaces of the first and second crossbeams, the upper furnace shell steel structure and the lower furnace shell steel structure are fixedly installed to the upper and lower surfaces of the air-cooled square box, respectively, in conjunction with the bolts. The furnace wall is fixedly installed on the upper furnace shell steel structure and the lower furnace shell steel structure.

[0020] A further improvement is that one end of the air intake pipe has a main air intake port, and the other end of the air intake pipe has two branch air intake ports, which are respectively connected to the opposite sides of one end of the first crossbeam; one end of the air outlet pipe has a main air outlet port, and the other end of the air outlet pipe has two branch air outlet ports, which are respectively connected to the opposite sides of the other end of the first crossbeam.

[0021] By designing the structure of the air inlet and outlet pipes, the hot air inside the first crossbeam can be quickly drawn away through the cooperation of the exhaust fan and the outlet pipe, while the cold air from the outside can be quickly replenished into the first crossbeam through the air inlet pipe. This greatly reduces the working temperature of the support beam and ensures the strength of the support beam in high-temperature environments.

[0022] A further improvement is that the longitudinal support beam, the first crossbeam, and the second crossbeam are all welded from steel plates, which has the characteristics of simple structure, low manufacturing cost, and low operating cost.

[0023] In a second aspect, the present invention provides a method for reducing the failure rate of a roller hearth furnace. The roller hearth furnace has the aforementioned air-cooled square box structure installed at its bottom. The furnace roller assembly is fixedly installed on the mounting surfaces on both sides of the air-cooled square box by bolts. During operation, the hot air in the ventilation channels inside the longitudinal support beam and the first crossbeam of the air-cooled square box is replaced with cold air, reducing the operating temperature of the first crossbeam, the longitudinal support beam, and the furnace roller assembly and related components such as seals and transmission components connected to them. On the one hand, this ensures the strength of the support beam in a high-temperature environment, and on the other hand, it ensures that the furnace roller assembly and related components (such as seals, transmission component sprockets, chains, gears, etc.) on the mounting surface are always within a reasonable temperature range, effectively extending their service life, ensuring good lubrication of the transmission components of the furnace roller assembly, reducing the operating temperature of the transmission motor, increasing its service life, and significantly reducing the failure rate of the roller hearth furnace.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1) The longitudinal support beams, first crossbeam, and second crossbeam in this air-cooled box are all made of welded steel plates, which have the characteristics of simple structure, low manufacturing cost, and low operating cost;

[0026] 2) The longitudinal support beams and the first cross beam of the air-cooled square box are all equipped with ventilation channels. During operation, the hot air in the ventilation channels can be replaced with cold air, which greatly reduces the working temperature of the support beams and ensures the strength of the support beams in high-temperature environments. At the same time, the surface temperature of the air-cooled square box can be significantly reduced, which can keep the furnace roller assembly and related components (such as seals, transmission components, sprockets, chains, gears, etc.) on the mounting surface within a reasonable temperature range, effectively extending their service life and significantly reducing the failure rate of the roller hearth furnace. It is especially suitable for roller hearth furnaces with strict airtight requirements for the furnace atmosphere.

[0027] 3) It can ensure good lubrication of the furnace roller group transmission components, reduce the operating temperature of the transmission motor, and improve its service life;

[0028] 4) The structure of this air-cooled square box ensures the rapid and stable installation of the modular furnace roller assembly;

[0029] 5) Reduced investment costs: In some high-temperature applications, ordinary support structures must be used to ensure the support strength, while the air-cooled square box structure in this application can be used with ordinary carbon steel while ensuring the same support strength. Attached Figure Description

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0031] Figure 1 This is a diagram showing the installation structure of a furnace roller assembly in the prior art.

[0032] Figure 2 This is a structural diagram of a furnace roller assembly in the prior art;

[0033] Figure 3 This is a schematic diagram of the structure of the air-cooled box during installation and use in this invention;

[0034] Figure 4 This is a top view of the air-cooled square box in this invention;

[0035] Figure 5 This is a side view of the air-cooled square box in this invention;

[0036] Figure 6 This is a cross-sectional view of the first crossbeam in this invention;

[0037] Figure 7 for Figure 6 Enlarged view of point A in the middle;

[0038] The specific reference numerals in the attached drawings are as follows: furnace roller assembly 1', furnace shell steel structure 2', furnace wall 3', heat insulation plate 4', furnace roller assembly 1, upper furnace shell steel structure 2, lower furnace shell steel structure 3, furnace wall 4, heat insulation plate 5, air-cooled square box 6, longitudinal support beam 7, upper ventilation duct 8, lower ventilation duct 9, elongated hole 10, first bolt mounting hole 11, stiffening plate 12, air inlet box 13, air outlet box 14, exhaust fan 15, first crossbeam 16, third bolt mounting hole 17, air inlet pipe 18, air outlet pipe 19, and second crossbeam 20. Detailed Implementation

[0039] An embodiment of the present invention discloses a structure for an air-cooled square box for a roller hearth furnace, such as... Figures 3 to 6As shown, the roller hearth furnace includes an upper furnace shell steel structure 2 and a lower furnace shell steel structure 3. An air-cooled square box 6 is installed at the bottom of the roller hearth furnace. The furnace roller assembly 1 is fixedly installed on the mounting surfaces on both sides of the air-cooled square box 6 by bolts. A heat insulation plate 5 is also installed on the inner side of the furnace roller assembly 1. The lower furnace shell steel structure 3 and the upper furnace shell steel structure 2 are also fixedly installed on the lower and upper surfaces of the air-cooled square box 6 by bolts, respectively. The furnace wall 4 is fixedly installed on the upper furnace shell steel structure 2 and the lower furnace shell steel structure 3. The air-cooled square box 6 includes two longitudinal support beams 7, ventilation ducts, multiple first crossbeams 16, two second crossbeams 20, an air inlet box 13, an air outlet box 14, an exhaust fan 15, an air inlet pipe 18, and an air outlet pipe 19.

[0040] Two longitudinal support beams 7 are symmetrically arranged along the length of the roller hearth furnace and are connected by multiple first crossbeams 16. The ends of the two beams are respectively connected to second crossbeams 20. At least one ventilation channel is formed inside the longitudinal support beam 7. The two ends of the longitudinal support beam 7 are respectively equipped with an air inlet box 13 and an air outlet box 14 that are connected to the ventilation channel inside. The end of the air outlet box 14 is connected to an exhaust fan 15. The longitudinal support beam 7 has elongated holes 10 for mounting the furnace roller assembly 1 and multiple first bolt mounting holes 11. The size, number and spacing of the elongated holes 10 are determined according to the external dimensions and installation position of the furnace roller assembly 1. The first bolt mounting holes 11 are used to fix the furnace roller assembly 1. Turn on the exhaust fan 15 to draw away the hot air inside the ventilation duct of the two longitudinal support beams 7 through the exhaust box 14. At the same time, cold air is supplied to the ventilation duct through the inlet box 13. This can effectively reduce the temperature of the longitudinal support beams 7 and the components connected to them (furnace roller group 1 and related components). On the one hand, it can increase the strength of the support beams, and on the other hand, it can improve the working temperature of the components connected to them and extend their service life.

[0041] Both the first crossbeam 16 and the second crossbeam 20 have hollow internal structures. Since the first crossbeam 16 is located between the two longitudinal support beams 7, where the operating temperature is high, an air inlet pipe 18 and an air outlet pipe 19 are respectively connected to both ends of the first crossbeam 16. An exhaust fan 15 is connected to the end of the exhaust fan 19, which can be shared with the exhaust fan 15 of the longitudinal support beam 7 or installed independently. The exhaust fan 15 removes the hot air inside the first crossbeam 16, increasing its support strength. Since the second crossbeam 20 is located at both ends of the two longitudinal support beams 7, where the operating temperature is low, no air inlet pipe 18 or exhaust pipe 19 is installed at either end of the second crossbeam 20.

[0042] Among them, such as Figure 7As shown, the upper part of the longitudinal support beam 7 and the lower part of the longitudinal support beam 7 are respectively formed along the length direction. The middle of the outer side of the longitudinal support beam 7 is provided with an elongated hole 10 along the length direction, and multiple first bolt mounting holes 11 are evenly distributed on the outside of the elongated hole 10. With the above structural arrangement, the temperature of the longitudinal support beam 7 and the furnace roller group 1 connected to it and related components can be reduced more quickly and effectively.

[0043] The longitudinal support beam 7 contains multiple stiffening plates 12 located between the upper ventilation duct 8 and the lower ventilation duct 9. Specifically, the stiffening plates 12 are arranged at intervals according to the position of the elongated holes 10 to enhance the strength of the air-cooled box.

[0044] The longitudinal support beam 7 has multiple second bolt mounting holes (not shown in the figure) on its upper and lower surfaces for installing the upper furnace shell steel structure 2 and the lower furnace shell steel structure 3.

[0045] The first crossbeam 16 and the second crossbeam 20 have multiple third bolt mounting holes 17 on their upper and lower surfaces for installing the upper furnace shell steel structure 2 and the lower furnace shell steel structure 3. Through the second bolt mounting holes on the upper and lower surfaces of the two longitudinal support beams 7, and the third bolt mounting holes 17 on the upper and lower surfaces of the first crossbeam 16 and the second crossbeam 20, the upper furnace shell steel structure 2 and the lower furnace shell steel structure 3 are fixedly installed onto the upper and lower surfaces of the air-cooled square box 6, respectively, with the bolts engaging. The furnace wall 4 is then fixedly installed on the upper furnace shell steel structure 2 and the lower furnace shell steel structure 3.

[0046] The intake pipe 18 has a main air inlet at one end and two branch air inlets at the other end, which are respectively connected to opposite sides of one end of the first crossbeam 16. The exhaust pipe 19 has a main exhaust port at one end and two branch air outlets at the other end, which are respectively connected to opposite sides of the other end of the first crossbeam 16. Through the structural design of the intake pipe 18 and exhaust pipe 19, the hot air inside the first crossbeam 16 can be quickly extracted by the cooperation of the exhaust fan 15 and the exhaust pipe 19, while cold air from the outside can be rapidly introduced into the first crossbeam 16 through the intake pipe 18. This significantly reduces the working temperature of the support beam and ensures its strength in high-temperature environments.

[0047] Among them, the longitudinal support beam 7, the first crossbeam 16, and the second crossbeam 20 are all welded from steel plates, which have the characteristics of simple structure, low manufacturing cost and low operating cost.

[0048] The method for reducing the failure rate of roller hearth furnaces using this air-cooled square box structure is as follows:

[0049] During normal production of the roller hearth furnace, the exhaust fan 15 is continuously turned on. Hot air is drawn from the lower ventilation duct 9 and upper ventilation duct 8 of the longitudinal support beam 7 through the exhaust port bellows 14. Simultaneously, cold air is supplied to the lower and upper ventilation ducts 9 and 8 through the inlet bellows 13. Under the combined action of the exhaust fan 15, hot air is also drawn from the first crossbeam 16 through the exhaust pipe 19, while cold air is supplied to the first crossbeam 16 through the inlet pipe 18. This effectively reduces the pressure on the longitudinal support beam 7. The temperature of the furnace roller assembly 1 and its connected components (such as seals, transmission components, sprockets, chains, gears, etc.) and the first crossbeam 16 ensures the strength of the support beam in a high-temperature environment. On the other hand, it keeps the furnace roller assembly 1 and its related components (such as seals, transmission components, sprockets, chains, gears, etc.) on the mounting surface within a reasonable temperature range, effectively extending their service life, ensuring good lubrication of the furnace roller assembly transmission components, reducing the operating temperature of the transmission motor, improving its service life, and significantly reducing the failure rate of the roller hearth furnace.

[0050] In summary, the air-cooled square box structure for roller hearth furnaces in this invention has the following beneficial effects:

[0051] 1) The longitudinal support beam 7, the first crossbeam 16, and the second crossbeam 20 in the air-cooled square box 6 are all made of welded steel plates, which have the characteristics of simple structure, low manufacturing cost and low operating cost;

[0052] 2) The longitudinal support beam 7 and the first cross beam 16 of the air-cooled square box 6 are both equipped with ventilation channels. During operation, the hot air in the ventilation channels can be replaced with cold air, which greatly reduces the working temperature of the support beam and ensures the strength of the support beam in a high-temperature environment. At the same time, the surface temperature of the air-cooled square box 6 can be significantly reduced, which can keep the furnace roller group 1 and related components (such as seals, transmission components, sprockets, chains, gears, etc.) on the mounting surface in a reasonable temperature range, effectively extending their service life and significantly reducing the failure rate of the roller hearth furnace. It is especially suitable for roller hearth furnaces with strict airtight requirements for the furnace atmosphere.

[0053] 3) It can ensure good lubrication of the transmission components of furnace roller group 1, reduce the operating temperature of the transmission motor, and improve its service life;

[0054] 4) Reduced investment costs: In some high-temperature applications, ordinary support structures must be used to ensure the support strength, while the air-cooled square box 6 structure in this application can be used with ordinary carbon steel while ensuring the same support strength.

[0055] The above examples illustrate the present invention only to aid in understanding it and are not intended to limit the scope of the invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the principles of this invention.

Claims

1. A structure for an air-cooled square box for a roller hearth furnace, characterized in that, It includes two longitudinal support beams, ventilation ducts, multiple first crossbeams, two second crossbeams, an air inlet box, an air outlet box, an exhaust fan, an air inlet pipe, and an air outlet pipe; The two longitudinal support beams are symmetrically arranged along the length of the roller hearth furnace and are connected by multiple first crossbeams. The ends of the two beams are respectively connected to second crossbeams. At least one ventilation channel is formed inside the longitudinal support beam. An air inlet box and an air outlet box connected to the ventilation channel are installed at both ends of the longitudinal support beam. An exhaust fan is connected to the end of the air outlet box. The longitudinal support beam has elongated holes for installing furnace rollers and multiple first bolt mounting holes on its side. Both the first and second crossbeams have hollow internal structures. The first crossbeam has an air inlet pipe and an air outlet pipe installed at both ends, and the end of the air outlet pipe is connected to an exhaust fan.

2. The air-cooled square box structure for a roller hearth furnace according to claim 1, characterized in that, The upper and lower parts of the longitudinal support beam are respectively formed along the length direction of the upper and lower parts. The long strip hole is opened in the middle of the outer side of the longitudinal support beam along the length direction, and multiple first bolt mounting holes are evenly distributed on the outside of the long strip hole.

3. The air-cooled square box structure for a roller hearth furnace according to claim 2, characterized in that, The longitudinal support beam has multiple stiffening plates located between the upper and lower ventilation ducts.

4. The air-cooled square box structure for a roller hearth furnace according to claim 1, characterized in that, The upper and lower surfaces of the longitudinal support beam are respectively provided with multiple second bolt mounting holes for installing the upper furnace shell steel structure and the lower furnace shell steel structure.

5. The air-cooled square box structure for a roller hearth furnace according to claim 1, characterized in that, The upper and lower surfaces of the first and second crossbeams are respectively provided with multiple third bolt mounting holes for installing the upper furnace shell steel structure and the lower furnace shell steel structure.

6. The air-cooled square box structure for a roller hearth furnace according to claim 1, characterized in that, One end of the air intake pipe has a main air intake port, and the other end of the air intake pipe has two branch air intake ports, which are respectively connected to the opposite sides of one end of the first crossbeam; one end of the air outlet pipe has a main air outlet port, and the other end of the air outlet pipe has two branch air outlet ports, which are respectively connected to the opposite sides of the other end of the first crossbeam.

7. The air-cooled square box structure for a roller hearth furnace according to claim 1, characterized in that, The longitudinal support beam, the first crossbeam, and the second crossbeam are all structures welded from steel plates.

8. A method for reducing the failure rate of a roller hearth furnace, characterized in that, The bottom of the roller hearth furnace is equipped with an air-cooled square box structure as described in any one of claims 1-7. The furnace roller assembly is fixedly installed on the mounting surfaces on both sides of the air-cooled square box by bolts. During operation, the hot air in the ventilation ducts inside the longitudinal support beam and the first crossbeam of the air-cooled square box is replaced with cold air, thereby reducing the working temperature of the first crossbeam, the longitudinal support beam, and the furnace roller assembly and related components connected thereto. The related components include seals, transmission components, and transmission motors.

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