Gradient cooling air-cooling device for rolled high-wear-resistance martensitic steel

Abstract

The utility model provides a gradient cooling air-cooling device for rolled high-wear-resistance martensitic steel, which relates to the field of air-cooling devices and comprises a support, a support plate fixed on the support, a conveying part mounted on the support plate and a cooling cover fixedly mounted on the support plate. Two separating devices are fixed in the cooling cover and divide the cooling cover into a first cooling area, a second cooling area and a third cooling area, a cooling piece is installed on the first cooling area, a center vent hole is formed in the center of the position, corresponding to the first cooling area, of the supporting plate, and side vent holes are formed in the side edge of the position, corresponding to the first cooling area, of the supporting plate. According to the steel cooling device, steel is cooled in a grading mode, the temperature difference between the surface and the interior of a steel body is reduced, and the abrasion resistance and the crack propagation resistance of the steel are improved to a certain degree, and the impact toughness is reduced to a certain degree.

Description

Technical Field

[0001] This utility model relates to the field of air-cooling devices, and in particular to a gradient cooling air-cooling device for high wear-resistant martensitic steel after rolling. Background Technology

[0002] Martensitic steel is a type of steel that achieves high strength and hardness through a phase transformation strengthening mechanism. It is primarily composed of a ferrite matrix and carbides. Its defining characteristic is its martensitic structure, a product of the diffusionless phase transformation of austenite during rapid cooling (quenching), typically exhibiting a acicular or lath-like structure. Martensitic steels are classified into low-carbon, medium-carbon, and high-carbon martensitic steels based on their carbon content. These steels generally have their properties adjusted through tempering, improving toughness while maintaining high strength. Common martensitic steel grades include 40Cr, GCr15, and 65Mn. Due to their excellent mechanical properties, martensitic steels hold an important position in fields such as machinery manufacturing, the automotive industry, and aerospace.

[0003] After rolling, martensitic steel needs to be cooled. In the existing technology, the martensitic steel is generally placed on a conveyor and directly ventilated until the required temperature is reached. In this method, the surface of the steel cools down rapidly to the martensitic transformation temperature, while the inside of the steel is still at a high temperature. This results in a large temperature difference between the surface and the inside. The stress caused by the temperature difference is superimposed with the stress caused by the volume expansion of martensite, which can easily cause cracks or deformation. This reduces the wear resistance of the martensitic steel, weakens its resistance to crack propagation, and reduces its impact toughness.

[0004] Therefore, it is necessary to provide a new gradient cooling air-cooling device for high wear-resistant martensitic steel after rolling to solve the above-mentioned technical problems. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a gradient cooling air-cooling device for high wear-resistant martensitic steel after rolling.

[0006] The gradient cooling air-cooling device for high wear-resistant martensitic steel after rolling provided by this utility model includes a base frame, a support plate fixed on the base frame, a conveyor installed on the support plate, and a cooling hood fixedly installed on the support plate. Two partition devices are fixed inside the cooling hood, which divide the cooling hood into a first cooling zone, a second cooling zone, and a third cooling zone. A cooling component is installed on the first cooling zone. A central ventilation hole is opened at the center of the support plate corresponding to the position of the first cooling zone, and a side ventilation hole is opened on the side. An arc-shaped frame is fixed at the bottom of the support plate corresponding to the position of the first cooling zone. The output end of the cooling component is inclined and faces the side ventilation hole.

[0007] Preferably, the separating device includes a sliding plate and two clamping plates, both of which are fixed on the cooling cover. The sliding plate is slidably disposed between the two clamping plates. A connecting frame is fixed to one end of the sliding plate, and a bolt is threaded onto the connecting frame. A groove is provided on the side wall of one of the clamping plates for the end of the bolt on the connecting frame to be moved into.

[0008] Preferably, the cooling component includes a first fan, a first duct, a first support, and a first jet pipe closed at both ends. The first fan is fixed to the outer wall of the cooling cover, the first support is fixed to the inner wall of the cooling cover, the first jet pipe is fixed on the first support, and multiple nozzles are provided on the first jet pipe. The first fan is connected to the inner cavity of the first jet pipe through the first duct.

[0009] Preferably, the two clamps in the separating device are provided with multiple vent holes near their top positions, and each of the multiple vent holes is fixedly connected with a bent pipe. The output end of the bent pipe is vertically downward, and each of the multiple bent pipes is movably provided with an adjusting pipe. The multiple adjusting pipes are fixedly connected to the sliding plate in the separating device through a connecting frame.

[0010] Preferably, when there are two cooling components, the two cooling components are respectively installed on the two opposite side walls of the cooling cover, and the support plate has side ventilation holes on both sides at the position corresponding to the first cooling zone.

[0011] Preferably, multiple wind baffles are symmetrically arranged on the bottom wall of the arc-shaped frame, and the height of the multiple wind baffles gradually increases along the direction that gradually approaches the lowest end of the arc-shaped frame.

[0012] Preferably, an air jet is also installed on the cooling shroud above the cooling component, with the output end of the air jet inclined toward the conveyor.

[0013] Preferably, the jet component includes a lifting component, a second bracket, a second jet pipe closed at both ends, a second duct, and a second fan. The second fan is fixed to the outer wall of the cooling cover, the second bracket is fixed to the lifting component, the second jet pipe is fixed to the second bracket, and multiple nozzles are fixedly connected to the second jet pipe. The second fan is connected to the inner cavity of the second jet pipe through the second duct.

[0014] Preferably, the lifting component includes a mounting frame, a threaded frame, and a transmission block. The mounting frame is fixed to the inner wall of the cooling cover. The threaded frame is rotatably connected to the mounting frame via a bearing. The threaded frame is threadedly connected to the transmission block, and the size of the transmission block is adapted to the size of the inner side of the mounting frame. The transmission block is fixedly connected to the second bracket.

[0015] Preferably, wind deflectors are fixed on both sides of the cooling cover. Each wind deflector includes a baffle and two limiting brackets. Both limiting brackets are fixed on the cooling cover. The baffle is movably disposed inside the two limiting brackets. Bolts are threaded onto the limiting brackets. Multiple grooves are provided on the baffle for the ends of the bolts on the limiting brackets to move into.

[0016] Compared with related technologies, the gradient cooling air-cooling device for high wear-resistant martensitic steel after rolling provided by this utility model has the following beneficial effects:

[0017] When the cooling components ventilate through the side ventilation holes, the gas enters the inner side of the arc-shaped frame through the side ventilation holes and flows back along the bottom wall of the arc-shaped frame to the conveyor, where it exchanges heat with the martensitic steel on the conveyor. This causes the temperature of the martensitic steel to decrease and the temperature of the gas to increase. Then, the heated gas overflows into the second cooling zone and exchanges heat with the martensitic steel in the second zone. The temperature of the martensitic steel decreases and the temperature of the gas continues to rise. The gas then enters the third cooling zone and exchanges heat again. The gas discharged from the first cooling zone undergoes multiple heat exchanges. Therefore, under normal circumstances, the gas temperature in the first cooling zone is lower than that in the second cooling zone, and the gas temperature in the second cooling zone is lower than that in the third cooling zone. The martensitic steel gradually moves from the third cooling zone to the first cooling zone, first contacting the higher temperature and then the lower temperature. This prevents the temperature of the steel surface from decreasing rapidly, reduces the temperature difference between the steel surface and the interior, and allows the steel to cool gradually. To a certain extent, this improves the wear resistance, crack propagation resistance, and reduces impact toughness of the steel. Attached Figure Description

[0018] Figure 1 A schematic diagram of the gradient cooling air-cooling device for high wear-resistant martensitic steel after rolling provided by this utility model;

[0019] Figure 2 for Figure 1 The diagram shows the internal structure of the cooling shroud.

[0020] Figure 3 for Figure 2 A partial structural diagram of the structure shown;

[0021] Figure 4 for Figure 2 The diagram shows the structure of the support plate and the arc-shaped frame.

[0022] The following are the labeling elements in the diagram: 1. Base frame; 2. Support plate; 3. First cooling zone; 4. Second cooling zone; 5. Third cooling zone; 6. Central ventilation hole; 7. Side ventilation hole; 8. Arc-shaped frame; 9. Sliding plate; 10. Clamping plate; 11. Connecting frame; 12. First fan; 13. First duct; 14. First support; 15. First jet pipe; 16. Vent hole; 17. Bent pipe; 18. Adjusting pipe; 19. Baffle plate; 20. Second support; 21. Second jet pipe; 22. Second duct; 23. Second fan; 24. Mounting frame; 25. Threaded frame; 26. Transmission block; 27. Limiting frame; 28. Baffle; 29. ​​Conveying component; 30. Connecting frame; 31. Cooling cover. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] In the specific implementation process, such as Figures 1-4 As shown, a gradient cooling air-cooling device for high wear-resistant martensitic steel after rolling includes a base frame 1, a support plate 2 fixed on the base frame 1, a conveyor 29 (a roller conveyor) mounted on the support plate 2, and a cooling hood 31 fixedly mounted on the support plate 2. The cooling hood 31 contains two partitioning devices that divide it into a first cooling zone 3, a second cooling zone 4, and a third cooling zone 5. Cooling components are installed on the first cooling zone 3. The support plate 2 has a central ventilation hole 6 at the center corresponding to the position of the first cooling zone 3 and side ventilation holes 7 on its sides. The bottom of the support plate 2 corresponds to the position of the first cooling zone 3. An arc-shaped frame 8 is fixed at the position. The output end of the cooling component is inclined and faces the side ventilation hole 7. When the cooling component ventilates towards the side ventilation hole 7, the gas enters the inner side of the arc-shaped frame 8 through the side ventilation hole 7 and flows back along the bottom wall of the arc-shaped frame to the conveyor 29, where it exchanges heat with the martensitic steel on the conveyor 29. This causes the temperature of the martensitic steel to decrease and the temperature of the gas to increase. Then, the heated gas overflows into the second cooling zone 4 and exchanges heat with the martensitic steel in the second zone. The temperature of the martensitic steel decreases and the temperature of the gas continues to rise. The gas enters the third cooling zone 5 and exchanges heat again, thus achieving the purpose of cooling the steel.

[0025] The separating device includes a sliding plate 9 and two clamping plates 10. Both clamping plates 10 are fixed on the cooling cover 31. The sliding plate 9 is slidably disposed between the two clamping plates 10. A connecting frame 11 is fixed to one end of the sliding plate 9. A bolt is threaded onto the connecting frame 11. A groove is provided on the side wall of one of the clamping plates 10 for the end of the bolt on the connecting frame 11 to move into it. Through the separating device, the sliding plate 9 slides between the two clamps and the bolt on it is tightened, so that one end of the bolt moves into the groove of the clamping plate 10. Through this structure, the length of the separating device can be adjusted according to the height of the steel.

[0026] The cooling component includes a first fan 12, a first duct 13, a first bracket 14, and a first jet pipe 15 closed at both ends. The first fan 12 is fixed to the outer wall of the cooling cover 31, and the first bracket 14 is fixed to the inner wall of the cooling cover 31. The first jet pipe 15 is fixed on the first bracket 14, and multiple nozzles are provided on the first jet pipe 15. The first fan 12 is connected to the inner cavity of the first jet pipe 15 through the first duct 13. Air is supplied to the first duct 13 through the first fan 12. After passing through the first jet pipe 15, the gas is ejected from the multiple nozzles of the first jet pipe 15 and enters the side ventilation hole 7 and the inner side of the arc-shaped frame.

[0027] Multiple ventilation holes 16 are provided near the top of the two clamping plates 10 in the separation device. A bent pipe 17 is fixedly connected to each ventilation hole 16. The output end of the bent pipe 17 is vertically downward. An adjusting pipe 18 is movably installed inside each bent pipe 17. The adjusting pipe 18 is fixedly connected to the sliding plate 9 in the separation device through the connecting frame 30. Hot air overflows to the multiple ventilation holes 16 and moves along the bent pipe 17 into the adjusting pipe 18, and then acts on the steel to achieve cooling.

[0028] When there are two cooling components, the two cooling components are respectively installed on the two opposite side walls of the cooling cover 31, and the support plate 2 is provided with side ventilation holes 7 on both sides corresponding to the position of the first cooling zone 3. When there are two cooling components, the nozzles of the two first jet pipes 15 respectively deliver air to the two side ventilation holes 7. The two streams of gas move along the bottom wall of the arc frame. After colliding, some of the gas moves upward, which facilitates heat dissipation at the bottom of the steel.

[0029] Multiple baffles 19 are symmetrically arranged on the bottom wall of the arc frame 8. The height of the multiple baffles 19 gradually increases along the direction that gradually approaches the lowest end of the arc frame. As the gas ejected from the first jet pipe 15 passes through each baffle 19, some of the gas overflows. After the action of multiple baffles 19, the uniformity of cooling at the bottom of the steel is improved.

[0030] A jetting component is also installed on the cooling shroud 31 above the cooling components. The output end of the jetting component is inclined towards the conveyor 29. The jetting component includes a lifting component, a second support 20, a second jet pipe 21 closed at both ends, a second duct 22, and a second fan 23. The second fan 23 is fixed to the outer wall of the cooling shroud 31. The second support 20 is fixed to the lifting component. The second jet pipe 21 is fixed on the second support 20. Multiple nozzles are fixedly connected to the second jet pipe 21. The second fan 23 is connected to the inner cavity of the second jet pipe 21 through the second duct 22. The lifting component includes a mounting bracket 24, a threaded bracket 25, and a transmission block 2. 6. Mounting bracket 24 is fixed to the inner wall of cooling cover 31. Threaded bracket 25 is rotatably connected to mounting bracket 24 through bearing. Threaded bracket 25 is threadedly connected to transmission block 26, and the size of transmission block 26 is adapted to the size of the inner side of mounting bracket 24. Transmission block 26 is fixedly connected to second bracket 20. By rotating threaded bracket 25, threaded bracket 25 drives transmission block 26 to move on mounting bracket 24, thereby adjusting the height of second jet pipe 21. Air is delivered into second duct 22 by second fan 23. After passing through second jet pipe 21, the gas is sprayed from multiple nozzles of second jet pipe 21 and acts on the steel.

[0031] Both sides of the cooling cover 31 are fixed with wind deflectors, which include baffles 28 and two limiting brackets 27. The two limiting brackets 27 are fixed on the cooling cover 31. The baffles 28 are movably disposed inside the two limiting brackets 27. Bolts are threaded onto the limiting brackets 27. The baffles 28 have multiple grooves for the ends of the bolts on the limiting brackets 27 to move into the grooves. By moving the baffles 28 inside the limiting brackets 27 and tightening the bolts on the limiting brackets 27, the ends of the bolts are moved into the grooves of the baffles 28, which is convenient for adjustment according to the height of the steel.

[0032] It should be noted that since the steel needs to be transported, the entire air-cooling device cannot be completely sealed. Therefore, it is inevitable that some gas will overflow from the gap between the baffle and the support plate 2. However, even after some gas overflows, this device can still achieve the effect of staged cooling compared to existing technologies.

[0033] The circuits and controls involved in this utility model are all existing technologies, and will not be described in detail here.

[0034] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A gradient cooling air-cooling device for high wear-resistant martensitic steel after rolling, characterized in that, Includes a base frame (1), on which a support plate (2) is fixed, on which a conveyor (29) is installed, and on which a cooling cover (31) is also fixedly installed. Two partition devices are fixed inside the cooling cover (31), which divide the cooling cover (31) into a first cooling zone (3), a second cooling zone (4) and a third cooling zone (5). A cooling component is installed on the first cooling zone (3). A central ventilation hole (6) is opened at the center of the support plate (2) corresponding to the position of the first cooling zone (3), and a side ventilation hole (7) is opened on the side. An arc frame (8) is fixed at the bottom of the support plate (2) corresponding to the position of the first cooling zone (3). The output end of the cooling component is inclined and faces the side ventilation hole (7).

2. The gradient cooling air-cooling device for high wear-resistant martensitic steel after rolling according to claim 1, characterized in that, The separating device includes a sliding plate (9) and two clamping plates (10). Both clamping plates (10) are fixed on the cooling cover (31). The sliding plate (9) is slidably disposed between the two clamping plates (10). A connecting frame (11) is fixed to one end of the sliding plate (9). A bolt is threaded onto the connecting frame (11). A groove is provided on the side wall of one of the clamping plates (10) for the end of the bolt on the connecting frame (11) to be moved into.

3. The gradient cooling air-cooling device for high wear-resistant martensitic steel after rolling according to claim 1, characterized in that, The cooling component includes a first fan (12), a first duct (13), a first bracket (14), and a first jet pipe (15) closed at both ends. The first fan (12) is fixed to the outer wall of the cooling cover (31), the first bracket (14) is fixed to the inner wall of the cooling cover (31), the first jet pipe (15) is fixed on the first bracket (14), and multiple nozzles are provided on the first jet pipe (15). The first fan (12) is connected to the inner cavity of the first jet pipe (15) through the first duct (13).

4. The gradient cooling air-cooling device for high wear-resistant martensitic steel after rolling according to claim 2, characterized in that, The two clamps (10) in the separation device are provided with multiple ventilation holes (16) near the top. Each ventilation hole (16) is fixedly connected with a bent pipe (17). The output end of the bent pipe (17) is vertically downward. Each bent pipe (17) is movably provided with an adjusting pipe (18). The adjusting pipe (18) is fixedly connected to the sliding plate (9) in the separation device through a connecting frame (30).

5. The gradient cooling air-cooling device for high wear-resistant martensitic steel after rolling according to claim 1, characterized in that, When there are two cooling components, the two cooling components are respectively installed on the two opposite side walls of the cooling cover (31), and the support plate (2) is provided with side ventilation holes (7) on both sides at the position corresponding to the first cooling zone (3).

6. The gradient cooling air-cooling device for high wear-resistant martensitic steel after rolling according to claim 1, characterized in that, Multiple wind baffles (19) are symmetrically arranged on the bottom wall of the arc-shaped frame (8), and the height of the multiple wind baffles (19) gradually increases along the direction that gradually approaches the lowest end of the arc-shaped frame.

7. The gradient cooling air-cooling device for high wear-resistant martensitic steel after rolling according to claim 1, characterized in that, An air jet is also installed on the cooling shroud (31) above the cooling component, with the output end of the air jet tilted toward the conveyor (29).

8. The gradient cooling air-cooling device for high wear-resistant martensitic steel after rolling according to claim 7, characterized in that, The jet component includes a lifting component, a second bracket (20), a second jet pipe (21) closed at both ends, a second duct (22), and a second fan (23). The second fan (23) is fixed to the outer wall of the cooling cover (31). The second bracket (20) is fixed to the lifting component. The second jet pipe (21) is fixed on the second bracket (20). Multiple nozzles are fixedly connected to the second jet pipe (21). The second fan (23) is connected to the inner cavity of the second jet pipe (21) through the second duct (22).

9. The gradient cooling air-cooling device for high wear-resistant martensitic steel after rolling according to claim 8, characterized in that, The lifting component includes a mounting bracket (24), a threaded bracket (25), and a transmission block (26). The mounting bracket (24) is fixed to the inner wall of the cooling cover (31). The threaded bracket (25) is rotatably connected to the mounting bracket (24) through a bearing. The threaded bracket (25) is threadedly connected to the transmission block (26), and the size of the transmission block (26) is adapted to the size of the inner side of the mounting bracket (24). The transmission block (26) is fixedly connected to the second bracket (20).

10. The gradient cooling air-cooling device for high wear-resistant martensitic steel after rolling according to claim 1, characterized in that, Both sides of the cooling cover (31) are fixed with wind deflectors. The wind deflectors include baffles (28) and two limiting brackets (27). The two limiting brackets (27) are fixed on the cooling cover (31). The baffles (28) are movably disposed inside the two limiting brackets (27). Bolts are threaded on the limiting brackets (27). The baffles (28) have multiple grooves for the ends of the bolts on the limiting brackets (27) to move into.

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