Ultra-dense roller pitch furnace roller group device for roller hearth furnace and its usage method

Abstract

The present invention relates to the field of furnaces in which the furnace charge is mechanically moved therein, and specifically to an ultra-dense roller pitch furnace roller set device for a roller hearth furnace and its use method. An ultra-dense roller pitch furnace roller set device for a roller hearth furnace includes a furnace wall (11) and a furnace shell (12), and is characterized in that it further includes a first support square box (21), a second support square box (22), a drive end assembly (31), a drive end cover plate (32), a free end assembly (41), a free end fixing plate (42), a free end cover plate (43) and furnace rollers (5). The drive end assembly (31) is embedded and fixed in the open mouth of the first support square box (21); the free end assembly (41) is embedded in the open mouth of the second support square box (22). A use method of an ultra-dense roller pitch furnace roller set device for a roller hearth furnace is characterized in that the following steps are sequentially implemented: ① feeding; ② cooling. The present invention is convenient for installation and disassembly and has strong adaptability.

Description

Technical Field

[0001] The present invention relates to the field of furnaces in which charge is mechanically moved therein, and more particularly to an ultra-dense roll pitch roll group device for a roller hearth furnace and a method for using the same. Background Art

[0002] A roller hearth furnace, also known as a roller hearth heat treatment furnace, is generally used for annealing, normalizing, quenching and tempering of steel plates, steel pipes, sections and wire rods. During use, the roller hearth furnace realizes the transfer of the steel charge to be heated in the furnace through the furnace rolls and their driving devices. The roll pitch of the furnace rolls of the roller hearth furnace needs to be calculated according to the size, weight, maximum furnace temperature of the steel charge, as well as the selected furnace roll material and furnace roll outer diameter. When the roll pitch is too large, the cantilever length at the end of the steel charge is long, and the deflection is large at high temperature, which easily collides with the furnace rolls and affects the smooth passage of the steel charge, and in some cases, it even penetrates under the furnace rolls, affecting production; when the roll pitch is too small, the number of furnace rolls is large, increasing the investment, and at the same time, the roll pitch is also limited by the outer dimensions of the bearing seats, sprockets, etc.

[0003] At present, the installation and arrangement of the furnace rolls of a conventional roller hearth furnace are generally as follows: the furnace rolls are used to support and transfer the steel charge to be heated in the furnace, each furnace roll is supported by a fixed-end bearing seat and a free-end bearing seat respectively, each furnace roll rotates under the drive of a drive sprocket, the fixed-end bearing seats and free-end bearing seats on both sides are fixedly installed on the furnace shell steel structure respectively, and the furnace shell steel structure is also used to support the furnace wall at the same time. The fixed-end bearing seat and the free-end bearing seat also have strict airtightness to prevent the furnace atmosphere from overflowing. Each furnace roll is evenly arranged in the furnace length direction, and its roll pitch meets the relevant process requirements of the roller hearth furnace.

[0004] For small roller hearth furnaces or experimental roller hearth furnaces, the designed size of the furnace chamber is small, and the size and weight of the steel charge to be heated are also small, but the heating process requirements (such as heating temperature, etc.) of the furnace are the same as those of a conventional roller hearth furnace. The roll diameter of the furnace rolls of this kind of roller hearth furnace is small, and the roll pitch calculated according to the heating process requirements is also very small. It is impossible to achieve the form of the furnace rolls and the drive device of a conventional roller hearth furnace. The main reasons are as follows: 1. The conventional furnace roll bearing seats use rolling bearings, and the bearing seats also need to consider the sealing performance and cooling structure (including water cooling chambers, cooling fins, etc.), and the size of the bearing seats is relatively large. If the roll pitch of the furnace rolls is too small, it will cause interference between adjacent bearing seats; 2. Both sides of the furnace rolls need to pass through the furnace wall. If the roll pitch of the furnace rolls is too small, it will cause the furnace wall openings to be too dense. On the one hand, it will affect the airtightness of the furnace wall, and on the other hand, it is very difficult to design the heat insulation structure at the position where the furnace roll shaft passes through the furnace wall; 3. If the roll pitch of the furnace rolls is too small, it will cause interference between adjacent drive sprockets. Summary of the Invention

[0005] In order to overcome the defects of the prior art and provide a heat treatment device with convenient disassembly and assembly, strong adaptability and long service life, the present invention discloses an ultra-dense roll pitch roll group device for a roller hearth furnace and a method for using the same.

[0006] The present invention achieves the invention object through the following technical solutions:

[0007] A super-dense roller pitch furnace roller group device for a roller hearth furnace, comprising a furnace wall and a furnace shell, the furnace shell being attached to the outer side wall of the furnace wall, and characterized in that: it further comprises a first support square box, a second support square box, a drive end assembly, a drive end cover plate, a free end assembly, a free end fixing plate, a free end cover plate and furnace rollers.

[0008] One wall hole is provided on each of the two opposite sides of the furnace wall, the wall hole being parallel to the bottom surface of the furnace wall, and one shell hole is provided on the furnace shell opposite to the wall hole of the furnace wall, the height of the shell hole being not less than the height of the wall hole.

[0009] The cross-sections of both the first support square box and the second support square box are in a "C" shape formed by a top box and a bottom box connected by a vertical box. The first support square box is sequentially embedded into the shell hole on one side of the furnace shell and the wall hole of the furnace wall, and the second support square box is sequentially embedded into the shell hole on the other side of the furnace shell and the wall hole of the furnace wall, and the first support square box and the second support square box are arranged with their openings facing each other.

[0010] The drive end assembly is embedded and fixed in the opening of the first support square box, the drive end cover plate is covered on the drive end assembly, a sealing ring is provided at the joint of the drive end cover plate and the drive end assembly to seal the internal cavity of the drive end assembly, and an observation hole is provided on the drive end cover plate to observe the operation of each component in the internal cavity of the drive end assembly.

[0011] The free end assembly is embedded in the opening of the second support square box and fixed on the vertical box of the second support square box through the free end fixing plate. The free end cover plate is covered on the free end fixing plate, a front sealing ring is provided at the joint of the free end cover plate and the free end fixing plate, and a rear sealing ring is provided at the joint of the free end cover plate and the vertical box of the second support square box to prevent the furnace atmosphere from overflowing.

[0012] At least two furnace rollers that are parallel to each other and in the same plane form a furnace roller group. The two ends of each furnace roller are respectively a drive end and a free end. The drive end of each furnace roller is sequentially sleeved in the drive end assembly and supported by the drive end assembly, and the free end of each furnace roller is sequentially sleeved in the free end assembly and supported by the free end assembly.

[0013] An upper drive heat insulation plate and a lower drive heat insulation plate are respectively provided on the upper and lower parts inside the drive end assembly to protect the metal components outside the drive end of the furnace roller. The outer ends of the upper drive heat insulation plate and the lower drive heat insulation plate are respectively stuck on the upper and lower parts of the opening of the first support square box. The upper drive heat insulation plate is arranged between the upper edge of the wall hole of the furnace wall and the drive end of the furnace roller, and the lower drive heat insulation plate is arranged between the drive end of the furnace roller and the lower edge of the wall hole of the furnace wall.

[0014] Upper and lower parts inside the free-end component are respectively provided with an upper free heat insulation plate and a lower free heat insulation plate to protect various metal components outside the free end of the furnace roller. The outer ends of the upper free heat insulation plate and the lower free heat insulation plate are respectively clamped at the upper and lower parts of the open end of the second support square box. The upper free heat insulation plate is arranged between the upper edge of the furnace wall hole and the free end of the furnace roller, and the lower free heat insulation plate is arranged between the free end of the furnace roller and the lower edge of the furnace wall hole.

[0015] The ultra-dense roller pitch furnace roller group device of the roller hearth furnace is characterized in that:

[0016] The drive-end component includes a drive-end support plate, a support sealing ring, an air injection hole, a sliding bearing, a drive sprocket, a retaining ring, a tensioning sprocket, a transmission sprocket, a chain and a spring tensioning device.

[0017] The cross-section of the drive-end support plate is a "C" shape formed by connecting a top plate and a bottom plate through a vertical plate. There is a component hole on the vertical box of the first support square box. The drive-end support plate is embedded in the component hole of the vertical box of the first support square box through the vertical plate with the open end facing outwards. A support sealing ring is provided at the joint of the drive-end support plate and the first support square box to ensure the sealing requirement and prevent the furnace atmosphere from overflowing. An air injection hole is provided on the vertical plate of the drive-end support plate. A sliding bearing equal in number to the furnace rollers is sequentially provided on the vertical plate of the drive-end support plate, and each sliding bearing on the vertical plate of the drive-end support plate is respectively opposite to the drive end of a furnace roller. At least two drive sprockets are provided inside the open end of the drive-end support plate, and the number of drive sprockets is equal to the number of furnace rollers. Each drive sprocket forms a drive group. The drive end of each furnace roller respectively passes through a sliding bearing and then connects to a drive sprocket, so that the furnace roller is rotatably sleeved on the vertical plate of the drive-end support plate. A retaining ring is sleeved on the drive end of the furnace roller, and the retaining ring abuts against the vertical plate of the drive-end support plate to prevent the furnace roller from axially moving. A tensioning sprocket and a transmission sprocket are respectively rotatably provided on both sides of the drive group on the vertical plate of the drive-end support plate of the furnace roller through a sprocket shaft. The chain is sequentially wound around the tensioning sprocket, each drive sprocket and the transmission sprocket. The spring tensioning device is fixed on the drive-end support plate and connected to the tensioning sprocket to adjust the chain tension and ensure the stability of the meshing of the drive sprocket, tensioning sprocket, transmission sprocket and the chain. A drive-end cover plate covers the open end of the drive-end support plate;

[0018] The free end assembly includes a free end support plate, a sleeve rod, a fastening bolt, and a sliding bearing. The free end support plate is embedded in the open end of the second support square box. A sleeve rod is provided on the outer side surface of the free end support plate, and the sleeve rod passes through the vertical box of the second support square box. The free end support plate is successively provided with sliding bearings equal in number to the furnace rolls, and each sliding bearing on the free end support plate is respectively opposite to the free end of a furnace roll. The free end of each furnace roll is respectively arranged in a sliding bearing. The free end fixing plate is attached to the outer side surface of the vertical box of the second support square box. The free end fixing plate, the second support square box, and the free end support plate are connected by at least two fastening bolts. The free end cover plate covers the free end fixing plate and covers the sleeve rod inside the free end cover plate.

[0019] The ultra-dense roll pitch furnace roll group device for a roller hearth furnace is characterized in that: the driving sprockets in the open end of the driving end support plate are arranged in two rows, front and back. Adjacent two driving sprockets are staggeredly arranged. Two driving sprockets spaced by one driving sprocket are located on the same transmission line. The vertical plate of the furnace roll driving end support plate is located on one side of the driving group and is rotatably provided with two tensioning sprockets through the same sprocket shaft. Each tensioning sprocket is respectively arranged on the transmission line where a row of driving sprockets is located. The vertical plate of the furnace roll driving end support plate is located on the other side of the driving group and is rotatably provided with two transmission sprockets through the same sprocket shaft. Each transmission sprocket is respectively arranged on the transmission line where a row of driving sprockets is located. Two chains are respectively wound around the tensioning sprockets, each driving sprocket, and the transmission sprockets on each of the said transmission lines in sequence.

[0020] The ultra-dense roll pitch furnace roll group device for a roller hearth furnace is characterized in that: the fastening bolts are selected as hexagon socket head cap screws, and there is a gap between the shaft shoulder at the free end of the furnace roll and the end face of the sliding bearing at the free end of the furnace roll.

[0021] The using method of the ultra-dense roll pitch furnace roll group device for a roller hearth furnace is characterized in that: it is successively implemented according to the following steps:

[0022] ① Feeding: The material to be conveyed is arranged on each furnace roll. The output shaft of the driving motor is connected to the transmission sprocket through a transmission mechanism. The transmission mechanism is selected as a gear speed change box. The transmission sprocket drives each driving sprocket to rotate through a chain, and the driving sprocket drives the furnace roll to rotate so as to convey the material;

[0023] ② Cooling: Both the first support square box and the second support square box are connected to an air extractor through air delivery pipes. The air extractor extracts the hot air in the inner cavities of both the first support square box and the second support square box to implement cooling.

[0024] The usage method of the ultra-dense roller spacing furnace roller group device of the roller hearth furnace is characterized by further comprising the following steps: ③ Gas injection: Inject nitrogen into the inner cavity of the drive end assembly through the gas injection holes, so that the air pressure in the inner cavity of the drive end assembly is maintained at 105% - 120% of the external atmospheric pressure, which not only cools the drive end assembly but also prevents the atmosphere in the furnace wall from overflowing into the inner cavity of the drive end assembly.

[0025] The present invention has the following beneficial effects:

[0026] 1. By using sliding bearings instead of rolling bearings, the outer diameter of the bearing can be designed to be smaller than the diameter of the furnace roller during design. At this time, the furnace rollers can be arranged in an ultra-dense manner without being affected by the sizes of the bearings on both sides. It can meet the requirements of the roller hearth furnace process while taking into account the requirements of the furnace roller diameter and ultra-dense roller spacing, and is especially suitable for small roller hearth furnaces or experimental roller hearth furnaces.

[0027] 2. Adopting modular design, it is convenient for installation and disassembly.

[0028] 3. It can ensure the airtightness requirements of the furnace atmosphere, and is especially suitable for roller hearth furnaces with strict requirements for the furnace atmosphere. At the same time, the two U-shaped boxes have a cooling function, which can extend the service life of each transmission component while ensuring stable transmission. Description of the Drawings

[0029] Figure 1 is the structural schematic diagram of the present invention,

[0030] Figure 2 is the schematic diagram of the first support box in the present invention,

[0031] Figure 3 is the schematic diagram of the second support box in the present invention,

[0032] Figure 4 is the front view of the drive end assembly in the present invention,

[0033] Figure 5 is the left view of the drive end assembly in the present invention,

[0034] Figure 6 is the front view of the free end assembly in the present invention,

[0035] Figure 7 is the right view of the free end assembly in the present invention,

[0036] Figure 8 is the top view of the present invention using multiple modules in combination,

[0037] Figure 9 is the top view schematic diagram of the drive end assembly when the drive sprocket is arranged in a double row. Detailed Embodiments

[0038] The present invention will be further described below through specific embodiments. Embodiment

[0039] A super-dense roller pitch furnace roller group device for a roller hearth furnace, comprising a furnace wall 11, a furnace shell 12, a first support square box 21, a second support square box 22, a drive end assembly 31, a drive end cover plate 32, a free end assembly 41, a free end fixing plate 42, a free end cover plate 43 and furnace rollers 5, as Figures 1 to 8 shown, the specific structure is:

[0040] The furnace shell 12 is attached to the outer side wall of the furnace wall 11. One wall hole is provided on each of the two opposite sides of the furnace wall 11. The wall holes are parallel to the bottom surface of the furnace wall 11. One shell hole is provided on the furnace shell 12 opposite to the wall holes of the furnace wall 11. The height of the shell hole is not less than the height of the wall hole;

[0041] The first support square box 21 and the second support square box 22 are respectively as Figure 2 and Figure 3 shown: The cross-sections of both the first support square box 21 and the second support square box 22 are in a "C" shape formed by connecting a top box and a bottom box through a vertical box. Both are welded into an internal hollow structure with steel plates and are arranged longitudinally according to the furnace length of the roller hearth furnace. The first support square box 21 is sequentially embedded into the shell hole on one side of the furnace shell 12 and the wall hole of the furnace wall 11. The second support square box 22 is sequentially embedded into the shell hole on the other side of the furnace shell 12 and the wall hole of the furnace wall 11. And the first support square box 21 and the second support square box 22 are arranged with their openings facing each other;

[0042] The drive end assembly 31 is embedded and fixed in the opening of the first support square box 21. The drive end cover plate 32 is covered on the drive end assembly 31. A sealing ring is provided at the joint of the drive end cover plate 32 and the drive end assembly 31 to seal the internal cavity of the drive end assembly 31. An observation hole is provided on the drive end cover plate 32 to observe the operation of each component in the internal cavity of the drive end assembly 31;

[0043] The free end assembly 41 is embedded in the opening of the second support square box 22 and fixed on the vertical box of the second support square box 22 through the free end fixing plate 42. The free end cover plate 43 is covered on the free end fixing plate 42. A front sealing ring 44 is provided at the joint of the free end cover plate 43 and the free end fixing plate 42. A rear sealing ring 45 is provided at the joint of the free end cover plate 43 and the vertical box of the second support square box 22 to prevent the furnace atmosphere from overflowing;

[0044] At least two furnace rollers 5 that are parallel to each other and in the same plane form a furnace roller group. In this embodiment, five furnace rollers are taken as an example. The two ends of each furnace roller 5 are respectively a drive end and a free end. The drive end of each furnace roller 5 is sequentially sleeved in the drive end assembly 31 and supported by the drive end assembly 31. The free end of each furnace roller 5 is sequentially sleeved in the free end assembly 41 and supported by the free end assembly 41;

[0045] On the upper and lower parts inside the drive end assembly 31, an upper drive heat insulation plate 71 and a lower drive heat insulation plate 72 are respectively provided to protect the metal components outside the drive end of the furnace roll 5. The outer ends of the upper drive heat insulation plate 71 and the lower drive heat insulation plate 72 are respectively stuck to the upper and lower parts of the open end of the first support square box 21. The upper drive heat insulation plate 71 is arranged between the upper edge of the wall hole of the furnace wall 11 and the drive end of the furnace roll 5, and the lower drive heat insulation plate 72 is arranged between the drive end of the furnace roll 5 and the lower edge of the wall hole of the furnace wall 11.

[0046] On the upper and lower parts inside the free end assembly 41, an upper free heat insulation plate 81 and a lower free heat insulation plate 82 are respectively provided to protect the metal components outside the free end of the furnace roll 5. The outer ends of the upper free heat insulation plate 81 and the lower free heat insulation plate 82 are respectively stuck to the upper and lower parts of the open end of the second support square box 22. The upper free heat insulation plate 81 is arranged between the upper edge of the wall hole of the furnace wall 11 and the free end of the furnace roll 5, and the lower free heat insulation plate 82 is arranged between the free end of the furnace roll 5 and the lower edge of the wall hole of the furnace wall 11.

[0047] In this embodiment, the drive end assembly 31 is as Figure 4 and Figure 5 shown: The drive end assembly 31 includes a drive end support plate 701, a support sealing ring 702, an air injection hole 703, a sliding bearing 704, a drive sprocket 705, a retaining ring 706, a tensioning sprocket 707, a drive sprocket 708, a chain 709 and a spring tensioning device 710.

[0048] The cross-section of the drive-end support plate 701 is in a "C" shape formed by connecting a top plate and a bottom plate through a vertical plate. The vertical box of the first support box 21 is provided with a component hole. The drive-end support plate 701 is embedded in the component hole of the vertical box of the first support box 21 through the vertical plate with the opening facing outwards. A support sealing ring 702 is provided at the joint of the drive-end support plate 701 and the first support box 21 to ensure the sealing requirement and prevent the furnace atmosphere from overflowing. An air injection hole 703 is provided on the vertical plate of the drive-end support plate 701. Sliding bearings 704 equal in number to the furnace rolls 5 are successively provided on the vertical plate of the drive-end support plate 701, and each sliding bearing 704 on the vertical plate of the drive-end support plate 701 is respectively opposite to the drive end of a furnace roll 5. At least two drive sprockets 705 are provided in the opening of the drive-end support plate 701. The number of drive sprockets 705 is equal to the number of furnace rolls 5. Each drive sprocket 705 forms a drive group. The drive end of each furnace roll 5 passes through a sliding bearing 704 and then connects to a drive sprocket 705, so that the furnace roll 5 is rotatably sleeved on the vertical plate of the drive-end support plate 701. A retaining ring 706 is sleeved on the drive end of the furnace roll 5, and the retaining ring 706 abuts against the vertical plate of the drive-end support plate 701 to prevent the axial movement of the furnace roll 5. On both sides of the drive group, a tensioning sprocket 707 and a driving sprocket 708 are respectively rotatably provided on the vertical plate of the drive-end support plate 701 of the furnace roll 5 through a sprocket shaft. The chain 709 is successively wound around the tensioning sprocket 707, each drive sprocket 705 and the driving sprocket 708. The spring tensioning device 710 is fixed on the drive-end support plate 701 and connected to the tensioning sprocket 707 to adjust the tension of the chain 709 to ensure the stability of the meshing of the drive sprocket 705, the tensioning sprocket 707, the driving sprocket 708 and the chain 709. The drive-end cover plate 32 covers the opening of the drive-end support plate 701.

[0049] In this embodiment, the free-end assembly 41 is as Figure 6 and Figure 7 shown: The free-end assembly 41 includes a free-end support plate 801, a sleeve rod 802, a fastening bolt 803 and a sliding bearing 704. The free-end support plate 801 is embedded in the opening of the second support box 22. A sleeve rod 802 is provided on the outer side surface of the free-end support plate 801, and the sleeve rod 802 passes through the vertical box of the second support box 22. Sliding bearings 704 equal in number to the furnace rolls 5 are successively provided on the free-end support plate 801, and each sliding bearing 704 on the free-end support plate 801 is respectively opposite to the free end of a furnace roll 5. The free end of each furnace roll 5 is respectively arranged in a sliding bearing 704. The free-end fixing plate 42 is attached to the outer side surface of the vertical box of the second support box 22. The free-end fixing plate 42, the second support box 22 and the free-end support plate 801 are connected by at least two fastening bolts 803. The free-end cover plate 43 covers the free-end fixing plate 42 and covers the sleeve rod 802 inside the free-end cover plate 43.

[0050] In this embodiment: The fastening bolt 803 is a hexagon socket head cap screw. A gap is left between the shaft shoulder at the free end of the furnace roll 5 and the end face of the sliding bearing 704 at the free end of the furnace roll 5, as shown by δ in Figure 7 as shown.

[0051] In this embodiment: The roll diameter, roll pitch, and number of the furnace rolls 5 are determined according to the process requirements of the roller hearth furnace in combination with the furnace length of the roller hearth furnace. Taking a super-dense roll pitch furnace roll group device for a roller hearth furnace in this embodiment as a module, when multiple modules need to be assembled, each module needs to be arranged staggeredly along the furnace length direction, that is, the drive end assemblies 31 in two adjacent modules are arranged on different sides. Specifically, as shown in Figure 8 shown: a, b, and c respectively represent three modules, the double-headed arrow d is the furnace length direction, e and f are respectively the widths of the two side furnace walls 11, and g is the width of the furnace chamber.

[0052] When this embodiment is in use, it is implemented in the following steps in sequence:

[0053] ① Feeding: The material to be conveyed is placed on each furnace roll 5. The output shaft of the drive motor is connected to the drive sprocket 708 through a transmission mechanism. The transmission mechanism is a gearbox. The drive sprocket 708 drives each drive sprocket 705 to rotate through a chain 709, and the drive sprocket 705 drives the furnace roll 5 to rotate to convey the material;

[0054] ② Cooling: Both the first support square box 21 and the second support square box 22 are connected to an air extractor through air pipes. The air extractor extracts the hot air in the inner cavities of the first support square box 21 and the second support square box 22 to implement cooling;

[0055] ③ Gas injection: Nitrogen is injected into the inner cavity of the drive end assembly 31 through the gas injection hole 703 to keep the air pressure in the inner cavity of the drive end assembly 31 at 105% - 120% of the external atmospheric pressure, which not only cools the drive end assembly 31 but also prevents the atmosphere in the furnace wall 11 from overflowing into the inner cavity of the drive end assembly 31. Embodiment

[0056] A super-dense roll pitch furnace roll group device for a roller hearth furnace, including a furnace wall 11, a furnace shell 12, a first support square box 21, a second support square box 22, a drive end assembly 31, a drive end cover plate 32, a free end assembly 41, a free end fixing plate 42, a free end cover plate 43, and a furnace roll 5, as shown in Figure 9 shown. The specific structure is:

[0057] The drive sprockets 705 within the opening of the drive end support plate 701 are arranged in two rows front and back. Adjacent drive sprockets 705 are staggered. Two drive sprockets 705 with one drive sprocket 705 in between are located on the same transmission line. On one side of the drive group, two tension sprockets 707 are rotatably provided on the vertical plate of the drive end support plate 701 of the furnace roll 5 through the same sprocket shaft. Each tension sprocket 707 is respectively arranged on the transmission line where one row of drive sprockets 705 is located. On the other side of the drive group, two drive sprockets 708 are rotatably provided on the vertical plate of the drive end support plate 701 of the furnace roll 5 through the same sprocket shaft. Each drive sprocket 708 is respectively arranged on the transmission line where one row of drive sprockets 705 is located. Two chains 709 are respectively wound around the tension sprockets 707, each drive sprocket 705, and drive sprockets 708 on each of the said transmission lines in sequence.

[0058] All other structures are the same as those in Embodiment 1.

[0059] The drive end assembly 31 includes a drive end support plate 701, a support sealing ring 702, an air injection hole 703, a sliding bearing 704, a drive sprocket 705, a tension sprocket 707, a drive sprocket 708, a chain 709, and a spring tensioning device 710.

[0060] Under normal circumstances, the drive sprockets 705, tension sprockets 707, and drive sprockets 708 all use single-row sprockets, and the chain 709 uses a single-row chain. However, in some extreme cases, due to the small roll pitch of the furnace roll 5, there is interference between adjacent drive sprockets 705. At this time, the arrangement of this embodiment can be adopted, that is: both the tension sprockets 707 and drive sprockets 708 use double-row sprockets, the drive sprockets 705 use single-row sprockets but are staggered at adjacent positions, and the chain 709 uses a double-row chain to avoid interference between adjacent drive sprockets 705.

[0061] All other usage methods are the same as those in Embodiment 1.

Claims

1. An ultra-dense roller pitch furnace roller set device for a roller hearth furnace, comprising a furnace wall (11) and a furnace shell (12), the furnace shell (12) being attached to the outer side wall of the furnace wall (11), characterized in that: It further includes a first support square box (21), a second support square box (22), a drive end assembly (31), a drive end cover plate (32), a free end assembly (41), a free end fixing plate (42), a free end cover plate (43) and a furnace roll (5). On each of the two opposite sides of the furnace wall (11), a wall hole is provided. The wall hole is parallel to the bottom surface of the furnace wall (11). At the position of the furnace shell (12) opposite to the wall hole of the furnace wall (11), a shell hole is provided for each. The height of the shell hole is not less than the height of the wall hole. The cross-sections of both the first support square box (21) and the second support square box (22) are in a "C" shape formed by connecting a top box and a bottom box through a vertical box. The first support square box (21) is sequentially embedded into the shell hole on one side of the furnace shell (12) and the wall hole of the furnace wall (11). The second support square box (22) is sequentially embedded into the shell hole on the other side of the furnace shell (12) and the wall hole of the furnace wall (11). And the first support square box (21) and the second support square box (22) are arranged with their openings facing each other. The drive end assembly (31) is embedded and fixed in the opening of the first support square box (21). The drive end cover plate (32) covers the drive end assembly (31). A sealing ring is provided at the joint between the drive end cover plate (32) and the drive end assembly (31). An observation hole is provided on the drive end cover plate (32). The free end assembly (41) is embedded in the opening of the second support square box (22) and fixed on the vertical box of the second support square box (22) through the free end fixing plate (42). The free end cover plate (43) covers the free end fixing plate (42). A front sealing ring (44) is provided at the joint between the free end cover plate (43) and the free end fixing plate (42). A rear sealing ring (45) is provided at the joint between the free end cover plate (43) and the vertical box of the second support square box (22). At least two furnace rolls (5) that are parallel to each other and in the same plane form a furnace roll group. The two ends of each furnace roll (5) are respectively a drive end and a free end. The drive end of each furnace roll (5) is sequentially sleeved in the drive end assembly (31) and supported by the drive end assembly (31). The free end of each furnace roll (5) is sequentially sleeved in the free end assembly (41) and supported by the free end assembly (41). An upper drive heat insulation plate (71) and a lower drive heat insulation plate (72) are respectively provided at the upper and lower parts inside the drive end assembly (31). The outer ends of the upper drive heat insulation plate (71) and the lower drive heat insulation plate (72) are respectively stuck at the upper and lower parts of the opening of the first support square box (21). The upper drive heat insulation plate (71) is arranged between the upper edge of the wall hole of the furnace wall (11) and the drive end of the furnace roll (5). The lower drive heat insulation plate (72) is arranged between the drive end of the furnace roll (5) and the lower edge of the wall hole of the furnace wall (11). Upper and lower parts inside the free end component (41) are respectively provided with an upper free heat insulation plate (81) and a lower free heat insulation plate (82). Outer ends of both the upper free heat insulation plate (81) and the lower free heat insulation plate (82) are respectively clamped at the upper and lower parts of the open end of the second support square box (22). The upper free heat insulation plate (81) is arranged between the upper edge of the wall hole of the furnace wall (11) and the free end of the furnace roll (5), and the lower free heat insulation plate (82) is arranged between the free end of the furnace roll (5) and the lower edge of the wall hole of the furnace wall (11).

2. The ultra-dense roll pitch furnace roll group device of the roller hearth furnace according to claim 1, characterized in that: The drive end component (31) includes a drive end support plate (701), a support sealing ring (702), an air injection hole (703), a sliding bearing (704), a drive sprocket (705), a retaining ring (706), a tensioning sprocket (707), a transmission sprocket (708), a chain (709) and a spring tensioning device (710). The cross-section of the drive end support plate (701) is in a "C" shape formed by connecting a top plate and a bottom plate through a vertical plate. A component hole is provided on the vertical box of the first support square box (21). The drive end support plate (701) is embedded in the component hole of the vertical box of the first support square box (21) through the vertical plate with the open end facing outwards. A support sealing ring (702) is provided at the joint between the drive end support plate (701) and the first support square box (21). An air injection hole (703) is provided on the vertical plate of the drive end support plate (701). A sliding bearing (704) equal in number to the furnace roll (5) is successively provided on the vertical plate of the drive end support plate (701), and each sliding bearing (704) on the vertical plate of the drive end support plate (701) is respectively opposite to the drive end of a furnace roll (5). At least two drive sprockets (705) are provided inside the open end of the drive end support plate (701). The number of drive sprockets (705) is equal to the number of furnace rolls (5). Each drive sprocket (705) forms a drive group. The drive end of each furnace roll (5) respectively passes through a sliding bearing (704) and then connects to a drive sprocket (705), so that the furnace roll (5) is rotatably sleeved on the vertical plate of the drive end support plate (701). A retaining ring (706) is sleeved on the drive end of the furnace roll (5), and the retaining ring (706) abuts against the vertical plate of the drive end support plate (701). A tensioning sprocket (707) and a transmission sprocket (708) are respectively rotatably provided on both sides of the vertical plate of the drive end support plate (701) of the drive end of the furnace roll (5) through a sprocket shaft. The chain (709) is successively wound around the tensioning sprocket (707), each drive sprocket (705) and the transmission sprocket (708). The spring tensioning device (710) is fixed on the drive end support plate (701) and is connected to the tensioning sprocket (707). The drive end cover plate (32) covers the open end of the drive end support plate (701). The free-end component (41) includes a free-end support plate (801), a sleeve rod (802), a fastening bolt (803), and a sliding bearing (704). The free-end support plate (801) is embedded in the open end of the second support square box (22). A sleeve rod (802) is provided on the outer side surface of the free-end support plate (801). The sleeve rod (802) passes through the vertical box of the second support square box (22). The free-end support plate (801) is successively provided with sliding bearings (704) equal in number to the number of furnace rolls (5). And each sliding bearing (704) on the free-end support plate (801) is respectively opposite to the free end of a furnace roll (5). The free end of each furnace roll (5) is respectively arranged in a sliding bearing (704). The free-end fixing plate (42) is attached to the outer side surface of the vertical box of the second support square box (22). The free-end fixing plate (42), the second support square box (22), and the free-end support plate (801) are connected by at least two fastening bolts (803). The free-end cover plate (43) covers the free-end fixing plate (42) and covers the sleeve rod (802) inside the free-end cover plate (43).

3. The super-dense roller pitch furnace roller group device for a roller hearth furnace according to claim 2, characterized in that: The driving sprockets (705) in the open end of the driving-end support plate (701) are arranged in two rows, front and back. Adjacent two driving sprockets (705) are staggered. Two driving sprockets (705) spaced by one driving sprocket (705) are located on the same transmission line. On one side of the driving group, two tension sprockets (707) are rotatably provided on the vertical plate of the driving-end support plate (701) of the furnace roll (5) through the same sprocket shaft. Each tension sprocket (707) is respectively arranged on the transmission line where a row of driving sprockets (705) is located. On the other side of the driving group, two transmission sprockets (708) are rotatably provided on the vertical plate of the driving-end support plate (701) of the furnace roll (5) through the same sprocket shaft. Each transmission sprocket (708) is respectively arranged on the transmission line where a row of driving sprockets (705) is located. Two chains (709) are respectively wound around the tension sprockets (707), each driving sprocket (705), and the transmission sprockets (708) on each of the transmission lines in sequence.

4. The ultra-dense roll pitch furnace roll group device for a roller hearth furnace according to any one of claims 1 to 3, characterized in that: The fastening bolt (803) is selected as an internal hexagon bolt. A gap is left between the shaft shoulder at the free end of the furnace roll (5) and the end face of the sliding bearing (704) at the free end of the furnace roll (5).

5. The method of using the ultra-dense roll pitch furnace roll group device for a roller hearth furnace according to any one of claims 1 to 3, characterized in that: The following steps are implemented successively as follows: ① Feeding: The material to be conveyed is placed on each furnace roll (5). The output shaft of the driving motor is connected to the transmission sprocket (708) through a transmission mechanism. The transmission mechanism is selected as a gearbox. The transmission sprocket (708) drives each driving sprocket (705) to rotate through the chain (709). The driving sprocket (705) drives the furnace roll (5) to rotate so as to convey the material. ② Cooling: Both the first support square box (21) and the second support square box (22) are connected to an air extractor through air delivery pipes. The air extractor extracts the hot air in the inner cavities of both the first support square box (21) and the second support square box (22) to implement cooling.

6. The usage method of the ultra-dense roll pitch furnace roll group device for a roller hearth furnace according to claim 4, characterized in that: The following steps are implemented successively as follows: ① Feeding: The material to be conveyed is placed on each furnace roll (5). The output shaft of the driving motor is connected to the driving sprocket (708) through a transmission mechanism. The transmission mechanism is a gearbox. The driving sprocket (708) drives each driving sprocket (705) to rotate through a chain (709), and the driving sprocket (705) drives the furnace roll (5) to rotate to convey the material; ② Cooling: Both the first support square box (21) and the second support square box (22) are connected to an air extractor through air pipes. The air extractor extracts the hot air in the inner cavities of the first support square box (21) and the second support square box (22) to implement cooling.

7. The method of using the ultra-dense roller pitch furnace roller group device of the roller hearth furnace according to claim 2 or 3, characterized in that: The following steps are implemented in sequence: ① Feeding: The material to be conveyed is placed on each furnace roll (5). The output shaft of the driving motor is connected to the driving sprocket (708) through a transmission mechanism. The transmission mechanism is a gearbox. The driving sprocket (708) drives each driving sprocket (705) to rotate through a chain (709), and the driving sprocket (705) drives the furnace roll (5) to rotate to convey the material; ② Cooling: Both the first support square box (21) and the second support square box (22) are connected to an air extractor through air pipes. The air extractor extracts the hot air in the inner cavities of the first support square box (21) and the second support square box (22) to implement cooling; ③ Gas injection: Nitrogen is injected into the inner cavity of the transmission end assembly (31) through the gas injection hole (703) to keep the air pressure in the inner cavity of the transmission end assembly (31) at 105% - 120% of the external atmospheric pressure, which not only cools the transmission end assembly (31) but also prevents the atmosphere in the furnace wall (11) from overflowing into the inner cavity of the transmission end assembly (31).

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