Roll quenching device for continuous heat treatment furnace

Abstract

The present application belongs to the technical field of roller quenching tool, and particularly relates to a roller quenching tool for a continuous heat treatment furnace, which comprises a roller quenching seat, a roller quenching table, a push-type conveying mechanism and a roller quenching type cooling mechanism, the roller quenching table is arranged on the upper wall of the roller quenching seat, and the push-type conveying mechanism comprises a driving assembly, a main roller assembly and a pushing assembly. The roller quenching tool for the continuous heat treatment furnace provided by the present application limits the maximum extension amount of the pushing copper block through the limiting structure of the strip-shaped groove, realizes the micro-lifting of the high-temperature workpiece, and forms a spraying water gap between the bottom surface of the high-temperature workpiece and the quenching roller. When the thickness of the high-temperature workpiece is large and the friction force is insufficient, the roller pressing wheel provides additional positive pressure to prevent the conveying from slipping and ensure the effective conveying of the workpiece. The residual heat of the workpiece is used as a driving power source, and it is not necessary to arrange external hydraulic and pneumatic pipelines inside the rotating quenching roller, so that the roller quenching tool is adapted to the harsh working conditions of high-temperature spraying and moisture in the quenching section.

Description

Technical Field

[0001] This invention belongs to the field of roller quenching tooling technology, specifically referring to a roller quenching tooling for continuous heat treatment furnaces. Background Technology

[0002] Roll quenching fixtures are mostly used in roller bottom heat treatment furnaces for tube, bar, disc, shaft and roller workpieces. The workpieces are supported by pairs of rollers and driven to move forward. After exiting the heating furnace, they are immediately sprayed or jet quenched to achieve continuous tempering and overall quenching.

[0003] The existing roller quenching fixtures used in continuous heat treatment furnaces have the following problems: Existing roller quenching fixtures for continuous heat treatment furnaces only transport disc-shaped and flat plate workpieces in a straight line. The quenching rollers form a fixed spray shield on the lower surface of the workpiece. During the quenching and cooling stage, the lifting fixture cannot lift the bottom of the disc-shaped workpiece to remove it from the quenching conveyor rollers, resulting in inconsistent cooling rates between the upper and lower parts. As a result, the workpiece is prone to uneven hardness and warping distortion. Furthermore, when conveying and spraying workpieces with large thickness and mass, slippage can easily occur between the workpiece and the conveying roller, reducing the efficiency of roller quenching of the workpiece. In summary, it cannot meet the current usage requirements for roll quenching fixtures used in continuous heat treatment furnaces. Summary of the Invention

[0004] To address the above issues and overcome the shortcomings of existing technologies, this solution provides a roller quenching fixture for continuous heat treatment furnaces. The fixture uses a limiting structure with a strip groove to restrict the maximum extension of the pushing copper block, achieving a slight lifting of the high-temperature workpiece. A spray-water gap is formed between the bottom surface of the high-temperature workpiece and the quenching roller. When the high-temperature workpiece is thick and lacks sufficient friction, the roller provides additional positive pressure to prevent slippage during transport and ensure effective workpiece transport. Utilizing the workpiece's own residual heat as a driving power source eliminates the need for external hydraulic or pneumatic pipelines inside the rotating quenching roller, making it suitable for the harsh conditions of high-temperature spraying and humid conditions in the quenching section.

[0005] The technical solution adopted in this solution is as follows: This solution proposes a roller quenching fixture for a continuous heat treatment furnace, including a roller quenching seat, a roller quenching table, a top-push type conveying mechanism, and a roller quenching type cooling mechanism. The roller quenching table is located on the upper wall of the roller quenching seat. The top-push type conveying mechanism includes a drive assembly, a main roller assembly, and a top-push assembly. The drive assembly is located on the side wall of the roller quenching table. The main roller assembly is located on the inner side wall of the roller quenching table. The top-push assembly is located on the main roller assembly. The roller quenching type cooling mechanism includes a spray assembly, a drain assembly, and a roller pressing assembly. The spray assembly is located on the side wall of the roller quenching seat. The drain assembly is located on the side of the roller quenching seat away from the spray assembly. The roller pressing assembly is located on the spray assembly.

[0006] As a further preferred embodiment of the present invention, the drive assembly includes a drive motor, a drive gear, a linkage chain, and a linkage shaft. The drive motor is located on the side wall of the roller quenching table, and multiple linkage shafts are rotatably located on the inner side wall of the roller quenching table. The output end of the drive motor passes through the roller quenching table and is connected to the linkage shaft. The drive gear is located on the outside of the linkage shaft, and the linkage chain is wound around the outside of the drive gear and meshes with the drive gear. The main roller assembly includes a support roller shaft and a quenching roller. The support roller shaft is located on the side of the linkage shaft away from the inner wall of the roller quenching table, and the quenching roller is located between the support roller shafts. The pushing assembly includes a strip groove, an expansion cavity, a pushing copper block, and a pushing spring. Multiple sets of strip grooves are located at both ends of the quenching roller, with one end open. Shoulder steps are provided inside the strip grooves to limit the maximum extension stroke of the pushing copper block. The expansion cavities are symmetrically located on the inner walls of both ends of the quenching roller and communicate with the strip grooves. A heat insulation layer can preferably be provided on the inner wall of the expansion cavity to reduce the heat dissipation impact of external sprayed cooling water on the enclosed air inside the cavity. A sealing structure is provided at the mating position of the expansion cavity and the strip groove to reduce the risk of air leakage. The pushing copper block slides inside the strip groove, and the pushing spring is located between the pushing copper block and the inner wall of the strip groove. The side of the pushing copper block away from the pushing spring is flush with the surface of the quenching roller. The pushing spring is made of high-temperature and corrosion-resistant spring material and can be equipped with a protective sleeve to reduce the risk of water vapor corrosion failure. The pushing copper block can be treated with wear-resistant reinforcement.

[0007] Preferably, the spraying assembly includes a fixed platform, a spray pipe, and spray nozzles. Multiple sets of the fixed platforms are disposed on the bottom wall of the roller quenching seat, the spray pipe spans the roller quenching platform and is disposed on the upper wall of the fixed platform, and multiple sets of spray nozzles are connected and disposed on the bottom wall of the spray pipe. The drainage assembly includes a drainage trough and a drain pipe. The drainage trough is disposed on the upper wall of the roller quenching seat and has an open top. Multiple sets of drain pipes pass through the roller quenching seat and are connected to the drainage trough. The rolling assembly includes a rolling frame and rolling rollers. The rolling frame is disposed on the bottom wall of the spray pipe, and multiple sets of rolling rollers are disposed on the bottom wall of the rolling frame. Preferably, the rolling rollers are elastically floating to adapt to the thickness tolerance of the workpiece and avoid workpiece jamming or insufficient clamping force.

[0008] Specifically, the side wall of the roll quenching seat is equipped with a controller.

[0009] The controller is electrically connected to the drive motor.

[0010] In use, the high-temperature workpiece is discharged from the roller hearth furnace and enters the quenching roller. The output end of the drive motor drives the linkage shaft to rotate. The linkage shaft drives the quenching roller to rotate through the support roller shaft. The linkage shaft also drives the linkage gear chain to rotate through the drive gear. The linkage gear chain drives the support roller shaft and the quenching roller to move together through the other sets of drive gears. The quenching roller transports the high-temperature workpiece supported on its upper wall. The end of the spray pipe away from the spray nozzle is connected to the external water supply pipe. Water flows into the spray pipe through the external water supply pipe. The spray pipe sprays water onto the high-temperature workpiece through the spray nozzle. On the quenching roller, the high-temperature workpiece is transported forward while being sprayed and cooled to complete the quenching. Expansion cavities are set inside both ends of the quenching roller. When the high-temperature workpiece enters the quenching roller at one end of the roller quenching table, the high-temperature workpiece contacts the quenching roller and the pushing copper block. The heat radiated by the high-temperature workpiece and the heat from the contact heat the closed air inside the expansion cavity through the pushing copper block. The air inside the expansion cavity expands and increases in pressure due to the heat, which overcomes the pre-compression elastic force of the pushing spring and pushes the pushing copper block out from inside the strip groove, slightly lifting the high-temperature workpiece upward. The bottom surface of the high-temperature workpiece forms a spray water gap with the roller surface of the quenching roller. The workpiece still partially maintains contact with the tooling to maintain the conveying. The lower surface of the high-temperature workpiece is completely exposed, and the spray cooling medium can spray the bottom surface of the high-temperature workpiece, which alleviates the problem of inconsistent cooling speed between the top and bottom caused by the quenching roller blocking the water flow when the disc-shaped workpiece is laid flat, thereby improving the quenching warping and uneven hardness.

[0011] The beneficial effects achieved by this solution using the above structure are as follows: Compared with existing technologies, this solution combines a push-type conveying mechanism with a roller quenching cooling mechanism. The maximum extension of the push-type copper block is limited by the shoulder step inside the strip groove, achieving a slight lifting of the high-temperature workpiece. A spray water gap is formed between the bottom surface of the high-temperature workpiece and the quenching roller, while the workpiece still maintains local contact to sustain conveying. An auxiliary roller is configured to provide additional positive pressure when the high-temperature workpiece is thick and the friction is insufficient, preventing slippage and ensuring effective conveying of the workpiece. This retains the bottom cooling effect of lifting while avoiding the slippage problem caused by reduced contact area. This device is driven by the residual heat of the workpiece, eliminating the need for external hydraulic and pneumatic pipelines inside the rotating quenching roller, reducing the probability of failure in high-temperature and high-humidity environments. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this solution; Figure 2 This is the front perspective stereoscopic view of this solution; Figure 3 This is a schematic diagram of the exploded structure of this scheme; Figure 4 This is the main view of this solution; Figure 5 This is a side view of the design. Figure 6This is a top view of the plan; Figure 7 for Figure 5 Sectional view of AA section; Figure 8 for Figure 6 Sectional view of BB section; Figure 9 for Figure 1 Enlarged structural view of section I; Figure 10 for Figure 7 Enlarged structural view of Part II; Figure 11 for Figure 8 Enlarged structural view of Part III.

[0013] The components are as follows: 1. Roll quenching seat; 2. Roll quenching table; 3. Push-type conveying mechanism; 4. Drive assembly; 5. Drive motor; 6. Drive gear; 7. Linkage gear chain; 8. Main roller assembly; 9. Support roller shaft; 10. Quenching roller; 11. Push assembly; 12. Strip groove; 13. Expansion cavity; 14. Push copper block; 15. Push spring; 16. Roll quenching cooling mechanism; 17. Spray assembly; 18. Fixed platform; 19. Spray pipe; 20. Spray nozzle; 21. Drainage assembly; 22. Drainage trough; 23. Drain pipe; 24. Controller; 25. Linkage shaft; 26. Roll pressing assembly; 27. Roll pressing frame; 28. Roll pressing wheel.

[0014] The accompanying drawings are provided to further understand the present solution and form part of the specification. They are used together with the embodiments of the present solution to explain the present solution and do not constitute a limitation thereof. Detailed Implementation

[0015] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this solution, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this solution without creative effort are within the scope of protection of this solution.

[0016] In the description of this solution, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this solution 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, they should not be construed as limitations on this solution.

[0017] like Figures 1-11As shown, the present solution proposes a roller quenching fixture for a continuous heat treatment furnace, including a roller quenching seat 1, a roller quenching platform 2, a top-push type conveying mechanism 3, and a roller quenching type cooling mechanism 16. The roller quenching platform 2 is disposed on the upper wall of the roller quenching seat 1. The top-push type conveying mechanism 3 includes a drive assembly 4, a main roller assembly 8, and a top-push assembly 11. The drive assembly 4 is disposed on the side wall of the roller quenching platform 2. The main roller assembly 8 is disposed on the inner side wall of the roller quenching platform 2. The top-push assembly 11 is disposed on the main roller assembly 8. The roller quenching type cooling mechanism 16 includes a spray assembly 17, a drain assembly 21, and a roller pressing assembly 26. The spray assembly 17 is disposed on the side wall of the roller quenching seat 1. The drain assembly 21 is disposed on the side of the roller quenching seat 1 away from the spray assembly 17. The roller pressing assembly 26 is disposed on the spray assembly 17.

[0018] The drive assembly 4 includes a drive motor 5, a drive gear 6, a linkage chain 7, and a linkage shaft 25. The drive motor 5 is located on the side wall of the roller quenching table 2. Multiple linkage shafts 25 are rotatably located on the inner side wall of the roller quenching table 2. The output end of the drive motor 5 passes through the roller quenching table 2 and is connected to the linkage shaft 25. The drive gear 6 is located on the outside of the linkage shaft 25. The linkage chain 7 is wound around the outside of the drive gear 6 and meshes with the drive gear 6. The main roller assembly 8 includes a support roller shaft 9 and a quenching roller 10. The support roller shaft 9 is located on the side of the linkage shaft 25 away from the inner wall of the roller quenching table 2, and the quenching roller 10 is located between the support roller shafts 9. The pushing assembly 11 includes a strip groove 12, an expansion cavity 13, a pushing copper block 14, and a pushing spring 15. Multiple sets of the strip groove 12 are located at both ends of the quenching roller 10, and each strip groove 12 is open at one end. A shoulder step is provided inside the strip groove 12 to limit the maximum extension stroke of the pushing copper block 14. The expansion cavity 13 is symmetrically located on the inner walls of both ends of the quenching roller 10 and communicates with the strip groove 12. Preferably, a heat insulation layer is provided on the inner wall of the expansion cavity 13 to reduce heat dissipation from external sprayed cooling water to the enclosed air inside the cavity. Impact: A sealing structure is set at the mating position of the expansion cavity 13 and the strip groove 12 to reduce the risk of air leakage. The push copper block 14 is slidably disposed inside the strip groove 12. The push spring 15 is disposed between the push copper block 14 and the inner wall of the strip groove 12. The push spring 15 is in a pre-compressed state. The push spring 15 is made of high temperature and corrosion resistant spring material. A protective sleeve can be added to reduce the risk of water vapor corrosion failure. The push copper block 14 can be treated with wear resistance. The side of the push copper block 14 away from the push spring 15 is flush with the surface of the quenching roller 10.

[0019] The spraying assembly 17 includes a fixed platform 18, a spray pipe 19, and spray nozzles 20. Multiple sets of fixed platforms 18 are disposed on the bottom wall of the roller quenching seat 1. The spray pipe 19 spans the roller quenching seat 2 and is disposed on the upper wall of the fixed platform 18. Multiple sets of spray nozzles 20 are connected and disposed on the bottom wall of the spray pipe 19. The drainage assembly 21 includes a drainage channel 22 and a drain pipe 23. The drainage channel 22 is disposed on the upper wall of the roller quenching seat 1 and has an open top. Multiple sets of drain pipes 23 penetrate the roller quenching seat 1 and are connected to the drainage channel 22. The rolling assembly 26 includes a rolling frame 27 and rolling rollers 28. The rolling frame 27 is disposed on the bottom wall of the spray pipe 19. Multiple sets of rolling rollers 28 are disposed on the bottom wall of the rolling frame 27. The rolling rollers 28 are preferably installed in an elastic floating manner to adapt to the thickness tolerance of the workpiece and avoid the workpiece getting stuck or insufficient clamping force.

[0020] The side wall of the roll quenching seat 1 is equipped with a controller 24.

[0021] The controller 24 is electrically connected to the drive motor 5.

[0022] In actual use, in the initial state, the push spring 15 is in a pre-compressed state, the surface of the push copper block 14 is flush with the surface of the quenching roller 10, the high temperature workpiece is discharged from the roller hearth furnace and enters the quenching roller 10, the controller 24 controls the drive motor 5 to start, the output end of the drive motor 5 drives the linkage shaft 25 to rotate, the linkage shaft 25 drives the quenching roller 10 to rotate through the support roller shaft 9, and the linkage shaft 25 drives the linkage gear chain 7 to rotate through the drive gear 6, and the linkage gear chain 7 drives the support roller shaft 9 and the quenching roller 10 to move together through the other sets of drive gears 6, so that the quenching roller 10 can transport the high temperature workpiece supported on its upper wall; Expansion cavities 13 are provided inside both ends of the quenching roller 10. When the high-temperature workpiece enters the quenching roller 10 at one end of the roller quenching table 2, the high-temperature workpiece contacts the quenching roller 10 and the pushing copper block 14. The heat radiated by the high-temperature workpiece and the heat from the contact heat are heated by the pushing copper block 14 to heat the closed air inside the expansion cavity 13. The air inside the expansion cavity 13 expands and increases in pressure due to the heat, which overcomes the pre-compression elastic force of the pushing spring 15 and pushes the pushing copper block 14 out from the inside of the strip groove 12, slightly lifting the high-temperature workpiece upward. The bottom surface of the high-temperature workpiece and the roller surface of the quenching roller 10 form a spray water gap. The workpiece still partially maintains contact with the tooling to maintain the conveying. The lower surface of the high-temperature workpiece is completely exposed. The end of the spray pipe 19 away from the spray nozzle 20 is connected to the external water supply pipe. Water flows into the interior of the spray pipe 19 through the external water supply pipe. The spray pipe 19 sprays water onto the high-temperature workpiece through the spray nozzle 20. On the quenching roller 10, the high-temperature workpiece is conveyed forward while being sprayed and cooled to complete the quenching. The end of the spray pipe 19 away from the spray nozzle 20 is connected to the external water supply pipe. Water flows into the interior of the spray pipe 19 through the external water supply pipe. The spray pipe 19 sprays water onto the high-temperature workpiece through the spray nozzle 20. On the quenching roller 10, the high-temperature workpiece is conveyed forward while being sprayed and cooled to complete the quenching. The spray cooling medium can be sprayed onto the bottom surface of high-temperature workpieces to alleviate the problem of inconsistent cooling speed between the top and bottom caused by the water flow being blocked by the quenching roller 10 when the disc-shaped workpiece is laid flat, thereby improving the quenching warping and uneven hardness. After the high-temperature workpiece is cooled, the gas inside the expansion cavity 13 is depressurized and cooled down. The pushing copper block 14 automatically retracts into the strip groove 12 by the elastic force of the pushing spring 15. The quenching roller 10 contacts the workpiece again. The cooled workpiece leaves the spray cooling area under the conveying of the quenching roller 10. When the high-temperature workpiece is thick and heavy, the pushing copper block 14 pushes the bottom of the high-temperature workpiece, so that its upper wall contacts the roller 28. The high-temperature workpiece with a large thickness and mass is squeezed and confined between the pushing copper block 14 and the roller 28, which increases the contact force between the high-temperature workpiece with a large thickness and mass and the pushing copper block 14, provides additional positive pressure, prevents slippage during conveying, and ensures effective conveying of the workpiece. It retains the bottom cooling effect brought by lifting and avoids the slippage problem caused by the reduction of contact area, improves the conveying efficiency of high-temperature workpieces, and ensures uniform cooling and quenching. The above operation can be repeated for the next use.

[0023] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0024] The present solution and its implementation methods have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present solution; the actual structure is not limited to this. In conclusion, if a person skilled in the art, inspired by this description, designs a similar structure and embodiment without departing from the inventive intent of this solution, such design should fall within the protection scope of this solution.

Claims

1. A roll quenching fixture for a continuous heat treatment furnace, comprising a roll quenching seat and a roll quenching table, characterized in that: It also includes a push-type conveying mechanism and a roll quenching type cooling mechanism. The roll quenching table is located on the upper wall of the roll quenching seat. The push-type conveying mechanism includes a drive assembly, a main roller assembly, and a push assembly. The drive assembly is located on the side wall of the roll quenching table, the main roller assembly is located on the inner side wall of the roll quenching table, and the push assembly is located on the main roller assembly. The roll quenching type cooling mechanism includes a spray assembly, a drainage assembly, and a roll pressing assembly. The spray assembly is located on the side wall of the roll quenching seat, the drainage assembly is located on the side of the roll quenching seat away from the spray assembly, and the roll pressing assembly is located on the spray assembly. The main roll assembly includes a quenching roll; The jacking assembly includes a strip groove, an expansion cavity, a jacking copper block, and a jacking spring; Multiple sets of strip grooves are provided at both ends of the quenching roller, and the strip grooves are open at one end. Shoulder steps are provided inside the strip grooves to limit the maximum extension stroke of the pushing copper block. Expansion cavities are symmetrically provided on the inner walls of both ends of the quenching roller, and the expansion cavities are connected to the strip grooves. A heat insulation layer is provided on the inner wall of the expansion cavity. A sealing structure is set at the mating position of the expansion cavity and the strip groove. The pushing copper block is slidably set inside the strip groove. The pushing spring is set between the pushing copper block and the inner wall of the strip groove. The side of the pushing copper block away from the pushing spring is flush with the surface of the quenching roller.

2. The roll quenching fixture for a continuous heat treatment furnace according to claim 1, characterized in that: The drive assembly includes a drive motor, a drive gear, a linkage chain, and a linkage shaft. The drive motor is located on the side wall of the roller quenching table, and multiple linkage shafts are rotatably located on the inner side wall of the roller quenching table. The output end of the drive motor passes through the roller quenching table and is connected to the linkage shaft. The drive gear is located on the outside of the linkage shaft, and the linkage chain is wound around the outside of the drive gear and meshes with the drive gear.

3. A roll quenching fixture for a continuous heat treatment furnace according to claim 2, characterized in that: The main roller assembly also includes a support roller shaft, which is located on the side of the linkage shaft away from the inner wall of the roller quenching table, and the quenching roller is located between the support roller shafts.

4. A roll quenching fixture for a continuous heat treatment furnace according to claim 1, characterized in that: The push spring is made of high temperature and corrosion resistant spring material and is equipped with a protective sleeve; the push copper block is treated with wear resistance and reinforcement.

5. A roll quenching fixture for a continuous heat treatment furnace according to claim 1, characterized in that: The spraying assembly includes a fixed platform, a spray pipe, and spray nozzles. Multiple sets of the fixed platforms are disposed on the bottom wall of the roller quenching seat, the spray pipes span the roller quenching platform and are disposed on the upper wall of the fixed platform, and multiple sets of spray nozzles are connected and disposed on the bottom wall of the spray pipes.

6. A roll quenching fixture for a continuous heat treatment furnace according to claim 1, characterized in that: The drainage assembly includes a drainage trough and drainage pipes. The drainage trough is located on the upper wall of the roller quenching seat and has an opening at the top. Multiple sets of drainage pipes pass through the roller quenching seat and are connected to the drainage trough.

7. A roll quenching fixture for a continuous heat treatment furnace according to claim 5, characterized in that: The roller pressing assembly includes a roller pressing frame and roller pressing wheels. The roller pressing frame is located on the bottom wall of the spray pipe, and multiple sets of roller pressing wheels are located on the bottom wall of the roller pressing frame. The roller pressing wheels are installed in an elastic floating manner.

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