Roller assembly for a transport table for hot direct rolling

Abstract

The utility model discloses a kind of roller assembly of transport roller table suitable for hot direct rolling, including shaft and the roller that is sleeved on shaft. Roller and shaft are hollow structure, the inside of roller is filled with GLJ-65 high-alumina dense refractory castable, heat insulation and strength are enhanced, prevent steel billet collision deformation. Cooling water pipe is equipped in shaft, through swivel joint connects net ring water, prevent thermal deformation. Roller both ends are equipped with sealing plate, adopt felt sealing, roller and sealing plate, sealing plate and shaft adopt H8 / f8 gap cooperation, reduce processing amount. Roller outer periphery is integrally formed flange, prevent steel billet from stripping. It also includes sprocket, bearing seat, bearing, transparent cover, shaft sleeve and baffle ring, sprocket is fixed by key and bolt, transparent cover and felt sealing bearing, shaft sleeve and baffle ring position sprocket. The assembly is high temperature resistant, antioxidant, service life reaches more than 12 months, maintenance frequency reduces 30%, meet the heat insulation and heat supplement demand of hot direct rolling, improve transportation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of metallurgical production equipment technology, specifically to a roller assembly structure for a conveyor roller table suitable for hot-rolling direct rolling processes. Background Technology

[0002] In modern metallurgical industry, hot-charge direct rolling is a highly efficient steel production method. It reduces energy consumption, increases production efficiency, and lowers costs by directly hot-charging continuously cast steel billets to a rolling mill for rolling. The core of this process lies in the billet transport, which requires the use of transport roller conveyors to ensure smooth billet movement. Transport roller conveyors typically consist of multiple roller assemblies that are driven to rotate by a transmission device, propelling the billet forward. However, in hot-charge direct rolling production, billet temperatures often reach 900-1200℃, exposing the roller assembly to a prolonged high-temperature environment, leading to a series of technical challenges.

[0003] Existing conveyor roller systems typically employ solid structures or simple metal materials, such as ordinary stainless steel or carbon steel. These materials are prone to oxidation, carburization, and corrosion at high temperatures, leading to rapid surface deterioration and affecting the stability of billet transport. Furthermore, high temperatures cause thermal expansion and deformation of the rollers, especially during billet collisions, which can easily result in cracks or perforations, further shortening their lifespan. Industry statistics indicate that under continuous high-temperature operation, the average lifespan of traditional rollers is only 3-6 months, requiring frequent replacements. This not only increases maintenance costs but also disrupts production processes and reduces overall efficiency.

[0004] Furthermore, existing roller assemblies often neglect the control of internal heat conduction. The high-temperature radiation and contact heat from the billet are rapidly conducted to the roller shaft and bearing components, leading to shaft deformation, bearing wear, and even safety accidents. To mitigate this problem, some solutions have introduced external cooling systems, but these systems are typically complex and inefficient, and cannot effectively isolate the heat source. Meanwhile, the roller flange design in existing technologies is mostly a welded attachment, which not only increases processing steps but also reduces overall strength, making it prone to detachment or deformation at high temperatures, resulting in the risk of billet detachment from the roller. Billet detachment from the roller not only damages equipment but can also lead to production accidents and affect operator safety.

[0005] Regarding thermal insulation, existing roller assemblies lack effective internal insulation measures. Steel billets need to maintain a certain temperature during transportation to ensure rolling quality; therefore, the roller conveyor must have insulation capabilities. However, traditional designs often achieve this through external insulation covers, which increases equipment size and complexity and fails to address heat loss issues from the rollers themselves. Simultaneously, the reheating process requires the roller conveyor to operate stably at high temperatures, but the uneven thermal stress distribution of existing rollers leads to localized overheating or uneven cooling, further exacerbating deformation and fatigue damage.

[0006] Some industry attempts to improve the situation include using ceramic coatings or composite materials, but these methods suffer from poor adhesion, high costs, and are prone to peeling in practical applications, failing to withstand the mechanical impact of steel billets over long periods. Another issue is assembly precision control. Existing connections between rollers and sealing plates / shafts mostly use welding or tight fitting methods, but welding thermal stress can cause shape deviations, requiring secondary processing and increasing manufacturing costs and time.

[0007] Overall, existing conveyor roller assemblies have significant deficiencies in terms of high-temperature durability, thermal insulation performance, structural strength, and assembly precision, and cannot meet the requirements of modern hot-rolling direct rolling processes for efficient and reliable transportation. Utility Model Content

[0008] In view of this, the purpose of this utility model is to solve the problems of easy deformation, cracking and oxidation of rollers in high-temperature environments in the prior art, and to provide a roller assembly suitable for hot-rolling conveyor rollers, thereby improving the durability and conveying efficiency of the rollers.

[0009] To achieve the above objectives, this utility model provides the following technical solution:

[0010] A roller assembly for a conveyor roller table suitable for hot-rolling direct rolling includes a shaft and rollers mounted on the shaft. Both the rollers and the shaft are hollow structures. The inside of the rollers is filled with high-alumina dense refractory castable. The shaft is equipped with a cooling water pipe, which is connected to a cooling water source through a rotary joint at its end.

[0011] Furthermore, the roller is provided with sealing plates at both ends, and the sealing plates are used to seal the high-alumina dense refractory castable with felt. The roller and the sealing plates, as well as the sealing plates and the shaft, are all fitted with an H8 / f8 clearance fit.

[0012] Furthermore, it also includes a sprocket, a bearing housing, and a bearing. The sprocket is fixed to one end of the shaft by a key and bolts, and the shaft is rotatably mounted on the bearing housing by bearings at both ends.

[0013] Furthermore, it also includes a cover, a bushing, and a retaining ring. The outer side of the sprocket is provided with a retaining ring fixed to the end of the shaft. The bushing is fitted onto the shaft and located between the sprocket and the bearing. The sprocket is axially positioned by the cooperation between the retaining ring and the bushing.

[0014] The cover is fixed to both sides of the bearing housing and seals the bearing by means of felt and shaft seal.

[0015] Furthermore, the outer periphery of the roller is provided with an integrally formed rim to prevent the steel billet from slipping off the roller.

[0016] Furthermore, the roller is made of heat-resistant stainless steel.

[0017] Furthermore, the high-alumina dense refractory castable is model GLJ-65.

[0018] The beneficial effects of this utility model are as follows:

[0019] This invention provides a roller assembly suitable for hot-rolling conveyor rollers, which has significant technical advantages and economic benefits.

[0020] First, the rollers and shafts adopt a hollow structure, and the inside of the rollers is filled with GLJ-65 high-alumina dense refractory castable, which effectively insulates heat and reduces the conduction of heat to the shaft and bearings. At the same time, it enhances the strength of the rollers, allows for thinner wall thickness, prevents deformation or cracking caused by steel billet collisions, significantly extends the roller life to more than 12 months, and reduces the maintenance frequency by about 30%.

[0021] Secondly, the internal cooling water pipes are connected to a circulating water system via a rotary joint, efficiently cooling the shaft, preventing high-temperature deformation, and ensuring rotational stability. The integrally formed rim on the outer circumference of the roller provides a guiding function, effectively preventing the billet from slipping off the roller, enhancing structural strength, and reducing welding processes. The roller and the sealing plate, and the sealing plate and the shaft, adopt an H8 / f8 clearance fit to control shape deviations, reduce secondary processing, and lower manufacturing costs by approximately 20%.

[0022] Furthermore, the optimized design of the bearings and felt seals, combined with the cover, bushing, and retaining ring, ensures smooth rotation and reliable sealing, preventing cooling water leakage and contaminant ingress, thus improving overall durability. This assembly meets the insulation and heat replenishment requirements of hot-rolling processes, is suitable for efficient billet transportation in high-temperature environments, significantly improves production efficiency, reduces energy consumption and maintenance costs, and has broad application prospects and significant economic benefits.

[0023] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein:

[0025] Figure 1 This is a cross-sectional view of the roller assembly of the conveyor roller table applicable to hot-rolling direct rolling in this utility model.

[0026] Figure 2 for Figure 1 Top view.

[0027] Reference numerals: 1-Retaining ring; 2-Sprocket; 3-Shaft sleeve; 4-Bearing housing; 5-Shaft; 6-Roller; 7-GLJ-65 high-alumina dense refractory castable; 8-Bearing; 9-Rotary joint; 10-Cooling water pipe; 11-Sealing plate; 12-Felt; 13-Transparent cover. Detailed Implementation

[0028] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this utility model. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0029] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0030] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0031] Example 1

[0032] like Figure 1 and Figure 2As shown, this utility model provides a roller assembly for a hot-rolling conveyor, designed to meet the requirements of heat insulation, heat replenishment, and durability during steel billet transportation in high-temperature environments. The assembly includes a shaft 5 and rollers 6 mounted on the shaft, both being hollow structures. Rollers 6 are filled with GLJ-65 high-alumina dense refractory castable 7, providing excellent heat insulation performance, reducing heat conduction to the shaft and bearings, while simultaneously enhancing roller strength and allowing for wall thickness reduction to 8mm, effectively preventing deformation or cracking caused by steel billet collisions. The shaft 5 is equipped with cooling water pipes 10, connected to a circulating cooling water source via a rotary joint 9 at the end, achieving continuous cooling of the shaft, preventing high-temperature deformation, and ensuring rotational stability.

[0033] Roller 6 has sealing plates 11 at both ends, which seal the refractory castable 7 with felt 12 to prevent leakage. Roller 6 and sealing plates 11, and sealing plates 11 and shaft 5 are fitted with an H8 / f8 clearance fit to ensure assembly accuracy, control shape deviation, and reduce secondary processing after welding. Roller 6 has an integrally formed rim with a height of 55mm on its outer periphery, which provides a guiding function to prevent the billet from falling off the roll, while also enhancing structural strength and reducing welding steps.

[0034] The assembly also includes a sprocket 2, a bearing housing 4, a bearing 8 (model 22319CC / W33), a cover 13, a bushing 3, and a retaining ring 1. The sprocket 2 is fixed to one end of a shaft 5 by a key and bolts. The shaft 5 is rotatably mounted on the bearing housing 4 via the bearings 8 at both ends, ensuring smooth rotation. A retaining ring 1 is provided on the outer side of the sprocket 2. The bushing 3 is fitted onto the shaft 5, located between the sprocket 2 and the bearing 8. The axial positioning of the sprocket is achieved through the cooperation of the retaining ring 1 and the bushing 3. The cover 13 is fixed to both sides of the bearing housing 4 and is sealed to the shaft 5 by felt 12 (specifications 85 and 110), protecting the bearing 8 and preventing cooling water leakage and contaminant ingress.

[0035] Roller 6 is made of 1Cr25Ni20Si2 heat-resistant stainless steel, with a maximum operating temperature of 1200℃, and exhibits excellent resistance to oxidation, carburization, and corrosion. In practical applications, this assembly is installed on a conveyor roller, and the transmission device drives the sprocket 2 via a chain to rotate roller 6, transporting steel billets at a temperature of 900-1100℃. Insulation, cooling, and sealing mechanisms ensure stable operation in high-temperature environments, meeting the requirements of heat preservation and reheating processes. Experiments show that this assembly has a service life of up to 12 months under continuous operation at 1150℃, reducing maintenance frequency by approximately 30%.

[0036] Example 2

[0037] like Figure 1 and Figure 2As shown, this embodiment provides a roller assembly suitable for higher loads and harsher high-temperature environments. It is an optimization based on Embodiment 1 and is suitable for transporting heavier steel billets at higher temperatures (e.g., 1100-1200℃). The basic structure of this assembly is the same as in Embodiment 1, including a shaft 5, rollers 6, GLJ-65 high-alumina dense refractory castable 7, cooling water pipes 10, rotary joints 9, sealing plates 11, felt 12, sprockets 2, bearing seats 4, bearings 8, through covers 13, bushings 3, and retaining rings 1. However, adjustments have been made to the materials and dimensions to meet higher requirements.

[0038] Roller 6 still uses 1Cr25Ni20Si2 heat-resistant stainless steel, but the wall thickness is slightly increased to 10mm to handle larger billet loads (a single billet can weigh up to 2 tons). The refractory castable 7 remains GLJ-65, with a 10% increase in filling amount to further improve insulation performance, reduce heat conduction, and ensure the roller surface temperature remains below 600℃, protecting the shaft and bearings. The diameter of the cooling water pipe 10 is increased to 20mm, and in conjunction with the high-flow rotary joint 9, the efficiency of the circulating water cooling is improved, keeping the shaft 5 temperature below 100℃ to prevent thermal deformation.

[0039] The flange height has been adjusted to 60mm, while maintaining the one-piece molding design, enhancing guiding capability and adapting to wider billets (up to 1.5m wide), effectively preventing roll slippage. Roller 6 and sealing plate 11, and sealing plate 11 and shaft 5 continue to use an H8 / f8 clearance fit, but with stricter tolerance control (±0.02mm) to ensure assembly accuracy under high loads. Bearing 8 remains the 22319CC / W33 model, with increased grease to accommodate more frequent rotation cycles. Felt 12 is made of high-temperature resistant composite material, improving sealing performance by 20% and extending seal life. The materials of the cover 13, bushing 3, and retaining ring 1 have been upgraded to heat-resistant alloys, further improving durability.

[0040] In practical applications, this assembly is installed on heavy-duty hot-rolling production lines. Sprockets 2 are driven by reinforced chains to transport high-temperature, heavy-load steel billets. Insulation and cooling systems ensure stable operation of the rollers at 1200°C, with a lifespan of 10-12 months and reduced maintenance costs by 25%. This design meets the transportation requirements of high-load, high-temperature environments, significantly improving production efficiency.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A roller assembly for a conveyor roller table suitable for hot-rolled direct rolling, comprising a shaft and rollers mounted on the shaft, characterized in that: Both the roller and the shaft are hollow structures. The inside of the roller is filled with high-alumina dense refractory castable. The shaft is equipped with a cooling water pipe, which is connected to a cooling water source through a rotary joint at the end.

2. The roller assembly for a conveyor roller table suitable for hot-rolled direct rolling as described in claim 1, characterized in that, The roller is provided with sealing plates at both ends. The sealing plates are used to seal the high-alumina dense refractory castable with felt. The roller and the sealing plates, as well as the sealing plates and the shaft, are all fitted with an H8 / f8 clearance fit.

3. The roller assembly for a conveyor roller table suitable for hot-rolled direct rolling as described in claim 1, characterized in that, It also includes a sprocket, a bearing housing, and a bearing. The sprocket is fixed to one end of the shaft by a key and bolts, and the shaft is rotatably mounted on the bearing housing by bearings at both ends.

4. The roller assembly for a conveyor roller table suitable for hot-rolled direct rolling as described in claim 3, characterized in that, It also includes a cover, a bushing, and a retaining ring. The outer side of the sprocket is provided with a retaining ring fixed to the end of the shaft. The bushing is fitted onto the shaft and located between the sprocket and the bearing. The sprocket is axially positioned by the cooperation of the retaining ring and the bushing. The cover is fixed to both sides of the bearing housing and seals the bearing by means of felt and shaft seal.

5. The roller assembly for a conveyor roller table suitable for hot-rolling direct rolling as described in claim 1, characterized in that, The outer periphery of the roller is provided with an integrally formed rim to prevent the steel billet from falling off the roller.

6. The roller assembly for a conveyor roller table suitable for hot-rolled direct rolling as described in claim 1, characterized in that, The rollers are made of heat-resistant stainless steel.

7. The roller assembly for a conveyor roller table suitable for hot-rolling direct rolling as described in claim 1, characterized in that, The high-alumina dense refractory castable is model GLJ-65.

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