Sectional type ceramic composite furnace bottom roller
Through the design of segmented ceramic composite furnace bottom rollers, the high-temperature resistance and tight fit structure of ceramic materials are used to solve the problem of thermal nodules and scales of alloy steel furnace bottom rollers at high temperatures, and the continuous heat treatment and production efficiency of steel pipes are improved.
Patent Information
- Application Number
- CN202422701257.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-06
- Publication Date
- 2025-08-26
- Estimated Expiration
- 2034-11-06
AI Technical Summary
The alloy steel furnace bottom roller is prone to heat storage nodules and adhesions during high temperature use, resulting in indentation and scratches of steel pipes, affecting production efficiency.
The segmented ceramic composite furnace bottom roller is adopted, including the roller mandrel, ceramic sleeve and ceramic spacer ring. It is connected by long bonds, using the high temperature resistance of the ceramic material to avoid deformation and oxidation. Combined with the design of locking nuts and springs, it ensures that the ceramic sleeve and spacer ring are closely fitted and avoids scratches of the steel pipe.
It effectively avoids the steel pipe being scratched and the formation of oxide scale at high temperatures, ensures continuous production, improves production efficiency, and avoids shutdown and maintenance.
Smart Images
Figure CN223271637U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of heat treatment equipment, in particular to a segmented ceramic composite furnace bottom roller. Background Art
[0002] Heat treatment is a key process in mechanical manufacturing. While heat treatment generally does not alter the shape or overall chemical composition of a workpiece, it instead modifies its internal microstructure or surface chemical composition to enhance or improve its performance. Heat treatment furnaces can be categorized as quenching, tempering, and annealing furnaces, depending on their intended use. Continuous furnaces are typically used to heat treat steel pipes. Pipes are continuously loaded through a loading port and conveyed by furnace bottom rollers while undergoing continuous heat treatment. The rollers conveying the pipes are rotatably supported at both ends along their longitudinal axis (direction of the roller axis) by bearings mounted on the furnace wall.
[0003] At present, alloy hearth rollers are widely used in front roller continuous annealing furnaces. However, alloy steel hearth rollers are prone to heat accumulation, nodules and adhesion of oxide scales during high-temperature use, causing indentations and scratches on steel pipes. Therefore, after a period of use, the furnace needs to be stopped to grind and repair the surface of the hearth rollers, affecting production efficiency. Utility Model Content
[0004] Aiming at the problems existing in the prior art, the utility model provides a segmented ceramic composite furnace bottom roller.
[0005] The technical solution adopted by the utility model to solve the above technical problems is: a segmented ceramic composite furnace bottom roller, including a roller core shaft and a first shaft head, the first shaft head is arranged at one end of the roller core shaft, and the other end of the roller core shaft is provided with a threaded shaft and a second shaft head in sequence along its axial direction, a fixed retaining ring and a sliding retaining ring are relatively provided on the roller core shaft, the sliding retaining ring is slidably sleeved on the roller core shaft, a plurality of ceramic sleeves sleeved on the roller core shaft are provided between the fixed retaining ring and the sliding retaining ring, a ceramic spacer ring sleeved on the roller core shaft is provided between two adjacent ceramic sleeves, a locking nut is threadedly connected on the threaded shaft, a pre-tightening retaining ring is sleeved on the threaded shaft between the sliding retaining ring and the locking nut, and a spring sleeved on the outside of the roller core shaft and the threaded shaft is provided between the pre-tightening retaining ring and the sliding retaining ring.
[0006] As a preferred solution, the ceramic sleeve, ceramic spacer ring and sliding retaining ring are connected to the roller core shaft through a long key.
[0007] As a preferred solution, the roller core shaft is provided with a long keyway along its axial direction, a long key is provided in the long keyway, the ceramic sleeve is provided with a first keyway that slides with the long key, the ceramic spacer ring is provided with a second keyway that slides with the long key, and the sliding retaining ring is provided with a third keyway that slides with the long key.
[0008] As a preferred solution, the first shaft head, roller core shaft, threaded shaft, second shaft head, fixed retaining ring, sliding retaining ring, pre-tightening retaining ring and spring are all made of heat-resistant steel.
[0009] As a preferred solution, the outer diameter of the ceramic sleeve is smaller than that of the ceramic spacer ring, the outer diameters of the ceramic spacer ring, the fixed retaining ring and the sliding retaining ring are equal, and the outer diameter of the preload retaining ring is smaller than or equal to that of the sliding retaining ring.
[0010] As a preferred solution, the outer circumferential surface of the fixed retaining ring and its end face are connected through a first rounded transition, the outer circumferential surface of the sliding retaining ring and its end face are connected through a second rounded transition, and the outer circumferential surface of the ceramic spacer ring and its end face are connected through a third rounded transition.
[0011] The beneficial effects of the present application are as follows: 1. The present application arranges a ceramic sleeve and a ceramic spacer ring on the outside of the roller core shaft. Under high temperature conditions, the surfaces of the ceramic sleeve and the ceramic spacer ring will not be deformed by heat, bulged, or nodules will form, and no oxide scale will be produced. On the one hand, it effectively avoids scratching the conveyed steel pipe, and on the other hand, it also avoids stopping the machine to repair the roller surface of the furnace bottom roller, thereby ensuring continuous production and improving production efficiency.
[0012] 2. The outer diameter of the ceramic sleeve of the present application is smaller than the outer diameter of the ceramic spacer ring, so as to avoid contact between the steel pipe and the contact part of the ceramic sleeve and the ceramic spacer ring when the steel pipe is transported, thereby avoiding scratching the steel pipe.
[0013] 3. The present application sets a locking nut and rotates the locking nut to bring it close to the sliding retaining ring, thereby pushing the pre-tightening retaining ring to compress the spring, thereby applying axial pressure to the sliding retaining ring, thereby pressing the ceramic sleeve and the ceramic spacer ring to ensure that the ceramic sleeve and the ceramic spacer ring fit tightly, and avoiding gaps between the ceramic sleeve and the ceramic spacer ring to scratch the steel pipe.
[0014] 4. This application avoids scratching the surface of the steel pipe by setting the first rounded corner, the second rounded corner and the third rounded corner.
[0015] 5. This application adopts the arrangement of multiple ceramic sleeves and multiple ceramic spacer rings to effectively avoid the risk of the ceramic sleeve being too long and easy to break.
[0016] 6. The ceramic sleeve, ceramic spacer ring and sliding retaining ring of the present application are connected to the roller core shaft via a long key, thereby preventing the ceramic sleeve, ceramic spacer ring and sliding retaining ring from slipping on the roller core shaft. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a structural diagram of the present utility model.
[0018] Markings in the figure: 1. Roller core shaft, 11. First shaft head, 12. Threaded shaft, 13. Second shaft head, 2. Preload ring, 3. Locking nut, 4. Fixed ring, 5. Ceramic sleeve, 6. Ceramic spacer ring, 7. Sliding ring, 8. Spring. DETAILED DESCRIPTION
[0019] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that in the description of the present invention, unless otherwise specified, the meaning of "multiple" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0020] See also Figure 1 The embodiment of the utility model provides a segmented ceramic composite furnace bottom roller, including a roller core shaft 1 and a first shaft head 11, the first shaft head 11 is arranged at one end of the roller core shaft 1, and the other end of the roller core shaft 1 is provided with a threaded shaft 12 and a second shaft head 13 in sequence along its axial direction. A fixed retaining ring 4 and a sliding retaining ring 7 are relatively provided on the roller core shaft 1, the fixed retaining ring 4 is fixedly sleeved on the outer wall of the roller core shaft 1, and the sliding retaining ring 7 is slidably sleeved on the roller core shaft 1, and a plurality of ceramic sleeves 5 sleeved on the roller core shaft 1 are provided between the fixed retaining ring 4 and the sliding retaining ring 7, and a ceramic spacer ring 6 sleeved on the roller core shaft 1 is provided between two adjacent ceramic sleeves 5, a locking nut 3 is threadedly connected on the threaded shaft 12, a pre-tightening retaining ring 2 is sleeved on the threaded shaft 12 between the sliding retaining ring 7 and the locking nut 3, and a spring 8 sleeved on the outside of the roller core shaft 1 and the threaded shaft 12 is provided between the pre-tightening retaining ring 2 and the sliding retaining ring 7.
[0021] Among them, the roller core shaft 1 is a hollow structure, the first shaft head 11 and the threaded shaft 12 are respectively fixed at both ends of the roller core shaft 1, and the threaded shaft 12 is provided with an external thread that cooperates with the thread of the locking nut 3. When the steel pipe is conveyed, the steel pipe is located between the fixed retaining ring 4 and the sliding retaining ring 7, that is, the steel pipe is in contact with the ceramic sleeve 5 or the ceramic spacer ring 6 during conveyance, and the ceramic sleeve 5 is ring-shaped.
[0022] In addition, the ceramic sleeve 5, ceramic spacer ring 6 and sliding retaining ring 7 are connected to the roller core shaft 1 through a long key. The roller core shaft 1 is provided with a long key groove along its axial direction, and a long key is provided in the long key groove. The ceramic sleeve 5 is provided with a first key groove that slides with the long key, and the ceramic sleeve 5 can slide left and right along the length direction of the long key. The ceramic spacer ring 6 is provided with a second key groove that slides with the long key, and the ceramic spacer ring 6 can slide left and right along the length direction of the long key. The sliding retaining ring 7 is provided with a third key groove that slides with the long key. The sliding retaining ring 7 can slide left and right along the length direction of the long key.
[0023] Specifically, the first shaft head 11, roller core shaft 1, threaded shaft 12, second shaft head 13, fixed retaining ring 4, sliding retaining ring 7, preload retaining ring 2 and spring 8 are all made of heat-resistant steel. The ceramic spacer ring 6 and ceramic sleeve 5 are also made of ceramic material.
[0024] The first shaft head 11 and the second shaft head 13 are respectively provided with a keyway, and the first shaft head 11 and the second shaft head 13 are respectively connected to the bearing on the same side through the keyway and the key.
[0025] More specifically, the outer diameter of the ceramic sleeve 5 is smaller than that of the ceramic spacer ring 6 , the outer diameters of the ceramic spacer ring 6 , the fixed retaining ring 4 and the sliding retaining ring 7 are equal, and the outer diameter of the preload retaining ring 2 is smaller than or equal to that of the sliding retaining ring 7 .
[0026] In addition, the outer circumference of the fixed retaining ring 4 and its end face are transitionally connected via a first fillet, the outer circumference of the sliding retaining ring 7 and its end face are transitionally connected via a second fillet, and the outer circumference of the ceramic spacer ring 6 and its end face are transitionally connected via a third fillet. The provision of the first, second, and third fillets prevents scratches on the steel pipe surface.
[0027] In the present application, a ceramic sleeve 5 and a ceramic spacer ring 6 are sleeved on the outer side of the roller core shaft 1. Under high temperature conditions, the surfaces of the ceramic sleeve 5 and the ceramic spacer ring 6 will not be deformed by heat, bulged, or nodules will form, and no oxide scale will be produced. On the one hand, it effectively avoids scratching the conveyed steel pipe, and on the other hand, it also avoids stopping the machine to repair the roller surface of the furnace bottom roller, thereby ensuring continuous production and improving production efficiency.
[0028] It should be noted that the above embodiments are only used to illustrate the present invention, but the present invention is not limited to the above embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention fall within the scope of protection of the present invention.
Claims
1. A segmented ceramic composite hearth roller, characterized in that: The invention comprises a roller core shaft (1) and a first shaft head (11), wherein the first shaft head (11) is arranged at one end of the roller core shaft (1), and the other end of the roller core shaft (1) is provided with a threaded shaft (12) and a second shaft head (13) in sequence along its axial direction, a fixed retaining ring (4) and a sliding retaining ring (7) are relatively provided on the roller core shaft (1), the sliding retaining ring (7) is slidingly sleeved on the roller core shaft (1), a plurality of ceramic sleeves (5) sleeved on the roller core shaft (1) are provided between the fixed retaining ring (4) and the sliding retaining ring (7), a ceramic spacer ring (6) sleeved on the roller core shaft (1) is provided between two adjacent ceramic sleeves (5), a locking nut (3) is threadedly connected on the threaded shaft (12), a pre-tightening retaining ring (2) is sleeved on the threaded shaft (12) between the sliding retaining ring (7) and the locking nut (3), and a spring (8) sleeved on the outside of the roller core shaft (1) and the threaded shaft (12) is provided between the pre-tightening retaining ring (2) and the sliding retaining ring (7).
2. The segmented ceramic composite hearth roller according to claim 1, characterized in that: The ceramic sleeve (5), the ceramic spacer ring (6) and the sliding retaining ring (7) are connected to the roller core shaft (1) via a long key.
3. The segmented ceramic composite hearth roller according to claim 2, characterized in that: The roller core shaft (1) is provided with a long key groove along its axial direction, a long key is provided in the long key groove, the ceramic sleeve (5) is provided with a first key groove that slides with the long key, the ceramic spacer ring (6) is provided with a second key groove that slides with the long key, and the sliding retaining ring (7) is provided with a third key groove that slides with the long key.
4. The segmented ceramic composite hearth roller according to claim 1, characterized in that: The first shaft head (11), the roller core shaft (1), the threaded shaft (12), the second shaft head (13), the fixed retaining ring (4), the sliding retaining ring (7), the preload retaining ring (2) and the spring (8) are all made of heat-resistant steel.
5. The segmented ceramic composite hearth roller according to claim 1, characterized in that: The outer diameter of the ceramic sleeve (5) is smaller than the outer diameter of the ceramic spacer ring (6); the outer diameters of the ceramic spacer ring (6), the fixed retaining ring (4) and the sliding retaining ring (7) are equal; and the outer diameter of the preload retaining ring (2) is smaller than or equal to the outer diameter of the sliding retaining ring (7).
6. The segmented ceramic composite hearth roller according to claim 1, characterized in that: The outer circumferential surface of the fixed retaining ring (4) and its end surface are connected via a first fillet transition, the outer circumferential surface of the sliding retaining ring (7) and its end surface are connected via a second fillet transition, and the outer circumferential surface of the ceramic spacer ring (6) and its end surface are connected via a third fillet transition.