Full-gap high-pressure roller quenching device and quenching method

Abstract

The present application relates to a kind of full gap high-pressure roller quenching device and quenching method, including water spraying system, roller system and hydraulic lifting system.Roller system includes multiple spiral roller groups, each spiral roller group includes two spiral rollers symmetrically arranged on the upper and lower sides of steel plate.Water spraying system includes multiple gap nozzle groups.The rear of each gap nozzle group is correspondingly arranged spiral roller group.Each gap nozzle group includes two gap nozzles symmetrically arranged on the upper and lower sides of steel plate, and the gap nozzle sprays water curtain along the direction of steel plate movement to form water curtain angle with steel plate wall surface when used.The water curtain angle formed by the first gap nozzle group is less than the water curtain angle formed by the second gap nozzle group, and the water curtain angle formed by the second gap nozzle group is less than the water curtain angle formed by the remaining gap nozzle groups, and the water spraying amount of gap nozzle group gradually decreases.The present application can realize steel plate alloy reduction, reduce cost, and well solve the problems existing in the prior art.

Description

Technical Field

[0001] This invention belongs to the field of steel plate heat treatment technology, and relates to a high-pressure roller quenching device and quenching method for steel plates with full gap. Background Technology

[0002] High-strength steel plates are key raw materials in equipment manufacturing, transportation, petrochemicals, and military industries, and are crucial for the large-scale, safe, and stable operation of equipment. After rolling, these steel plates require heat treatment, utilizing different heating and cooling regimes to control the steel plate's microstructure and shape, resulting in superior performance. Roller quenching machines, with their advantages of high cooling intensity, uniform quenching, high control precision, and continuous production capability, have become the primary quenching equipment for high-strength steel plates.

[0003] However, as users' requirements for the performance and quality of high-strength and high-quality steel plates gradually increase, the contradiction between improving the strength and toughness of steel plates and special service performance and reducing the amount of alloys and reducing production costs has become increasingly prominent. This has forced steel plate manufacturers to focus on the last link in changing the performance and appearance quality of steel plates—roll quenching. They are striving to further improve the cooling capacity of equipment through the development of new equipment or breakthroughs in new technologies, and to give full play to the advantages of using cheap water to replace alloy additives, so as to simultaneously achieve alloy reduction and performance improvement in high-strength and high-quality steel plates. However, so far, no ideal results have been achieved.

[0004] As heat transfer theory shows, during the quenching process of high-temperature steel plates after exiting the heat treatment furnace, surface heat transfer determines internal heat conduction, thus affecting the overall cooling rate of the plate. Traditional roller quenching machines employ a configuration of "1-2 sets of slit-type inclined jet nozzles + 4-6 sets of multi-row inclined circular hole jet nozzles" in the high-pressure section to achieve a "strong → weak" cooling process, conforming to the continuous cooling and phase transformation law of conventional steel plates and meeting the core quenching cooling rate requirements of conventionally composed tempered steel plates. However, with the reduction or elimination of rare and precious alloying elements such as nickel, chromium, molybdenum, and vanadium to improve hardenability, the hardenability of steel plates deteriorates, requiring a higher quenching cooling rate to meet the phase transformation thermodynamic conditions. Therefore, it is necessary to improve the cooling capacity of the high-pressure section of the roller quenching machine to further enhance the heat transfer capacity of the high-temperature steel plate wall, but currently, no method has been found that can meet these requirements.

[0005] In addition, a Chinese patent application (publication number CN108070699B) proposes a high-pressure cooling device for a steel plate roller quenching machine, including a roller conveyor system, a water spray system, and a water supply system. This invention uses a configuration of two sets of slit nozzles and four sets of inclined high-density nozzles to form a high-pressure cooling zone. This is a traditional configuration for roller quenching machines and cannot solve the aforementioned problems.

[0006] Chinese patent application (publication number CN114672627A) proposes a symmetrically constrained roller quenching device for heat-treated strengthened aluminum alloy plates, which divides the cooling zone into a first cooling zone, a second cooling zone, and a low-pressure cooling zone, employing 1-2 sets of narrow-slit nozzles, multiple sets of inclined fan-shaped nozzles, and multiple rows of round-hole nozzles, respectively. However, this device also fails to solve the aforementioned problems.

[0007] Chinese patent application (publication number CN103834791B) proposes a continuous roller quenching and cooling system for steel plates, including a water supply system, a water spraying system, a conveyor roller system, and a frame lifting system. The high-pressure zone water spraying system is equipped with slit nozzles and multiple rows of high-density inclined circular hole jet nozzles, arranged alternately. This nozzle configuration, including its type, arrangement, and quantity, is typical of traditional roller quenching machines and fails to address the aforementioned problems.

[0008] The aforementioned patents all adopt the traditional nozzle configuration of the high-pressure section of the quenching machine, which is a combination of a slit (or narrow slit) nozzle and multiple rows of inclined circular holes (or fan-shaped) nozzles. Although this meets the requirements of the existing steel plate alloy composition system (containing appropriate amounts of rare and precious alloys such as nickel, chromium, molybdenum, and vanadium), it cannot meet the requirements of the quenching cooling rate of steel plates under the conditions of alloy reduction composition system. Summary of the Invention

[0009] (a) Technical problems to be solved

[0010] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a full-gap high-pressure roller quenching device and quenching method, which solves the technical problem that the prior art cannot meet the quenching cooling rate requirements of steel plates under the conditions of alloy reduction composition system.

[0011] (II) Technical Solution

[0012] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0013] In a first aspect, embodiments of the present invention provide a full-gap high-pressure roller quenching device, comprising a water spray system, a roller conveyor system, and a hydraulic lifting system. The hydraulic lifting system is connected to the roller conveyor system, which forms a steel plate channel for steel plate movement. The water spray system corresponds to the steel plate within the channel and is used to spray water onto the steel plate surface. The roller conveyor system includes multiple spiral roller groups, each spiral roller group including two spiral rollers symmetrically arranged on the upper and lower sides of the steel plate. The water spray system includes multiple slit nozzle groups, which are arranged sequentially along the steel plate movement direction. A spiral roller group is arranged correspondingly behind each slit nozzle group. Each slit nozzle group includes two slit nozzles symmetrically arranged on the upper and lower sides of the steel plate. When in use, the slit nozzles spray a water curtain along the steel plate movement direction so that the water curtain forms an angle with the steel plate wall. The angle of the water curtain formed by the first slit nozzle group in the multiple slit nozzle groups is smaller than that formed by the second slit nozzle group, and the angle of the water curtain formed by the second slit nozzle group is smaller than that formed by the remaining slit nozzle groups. At the same time, the water spray volume of the multiple slit nozzle groups gradually decreases from front to back.

[0014] Further optionally, the water spray system includes five slit nozzle groups, wherein the water curtain angle formed by the first slit nozzle group is 25-27°, the water curtain angle formed by the second slit nozzle group is 29-31°, and the water curtain angles formed by the third to fifth slit nozzle groups are the same, all being 44-46°.

[0015] Further optionally, the water curtain angle formed by the first slit nozzle group is 26°, the water curtain angle formed by the second slit nozzle group is 30°, and the water curtain angle formed by the third to fifth slit nozzle groups is 45°.

[0016] Further optionally, the water spray slit width of the slit nozzles in the first and second slit nozzle groups is 2.0 mm; and the water spray slit width of the slit nozzles in the third to fifth slit nozzle groups is 2.5 mm.

[0017] Alternatively, two spiral roller groups may be arranged after the first slit nozzle group, and one spiral roller group may be arranged after the second to fifth slit nozzle groups.

[0018] Further optionally, the water volume of the next slit nozzle group in a plurality of slit nozzle groups is 80% of the water volume of the previous slit nozzle group.

[0019] Further optionally, the spacing between two adjacent slit nozzle groups is 500mm-700mm.

[0020] Optionally, a lower transition roller and a water-blocking roller are also included. The lower transition roller is located in front of the first slit nozzle group and is used to support the bottom wall of the steel plate, thereby guiding the steel plate into the steel plate channel. The water-blocking roller is located in front of the first slit nozzle group and is used to abut against the wall of the steel plate, thereby preventing residual quenching water from flowing back into the heat treatment furnace.

[0021] Alternatively, a control valve assembly can be installed on the pipeline connecting each slit nozzle to enable individual control of water flow and pipeline on / off for each slit nozzle.

[0022] Secondly, embodiments of the present invention provide a full-slit high-pressure roller quenching method, which is implemented using the aforementioned full-slit high-pressure roller quenching device. The method includes: introducing a steel plate from a heat treatment furnace into a steel plate channel and moving it within the channel; activating multiple slit nozzle groups; and spraying water curtains onto the top and bottom walls of the steel plate using these nozzle groups during the plate's movement, creating an angle between the water curtains and the steel plate walls. During this process, the angle formed by the first slit nozzle group is controlled to be smaller than that formed by the second slit nozzle group, and the angle formed by the second slit nozzle group is smaller than that formed by the remaining slit nozzle groups. Simultaneously, the water spray volume of the multiple slit nozzle groups gradually decreases from front to back.

[0023] (III) Beneficial Effects

[0024] The beneficial effects of this invention are as follows: This invention provides a full-slit high-pressure roller quenching device, comprising a water spray system, a roller conveyor system, and a hydraulic lifting system. The roller conveyor system includes multiple spiral roller groups, which rapidly discharge cooling water from the steel plate wall. Most importantly, the water spray system of this invention includes multiple slit nozzle groups; that is, this invention uses slit nozzles entirely for quenching. Each slit nozzle group includes two slit nozzles symmetrically arranged on the upper and lower sides of the steel plate. When in use, the slit nozzles spray a water curtain along the direction of steel plate movement, creating an angle between the water curtain and the steel plate wall. This full-slit nozzle quenching method eliminates the need to select multiple nozzles, simplifying the workpiece selection process. It also avoids the cumbersome construction and maintenance processes caused by differences in nozzle structure and model. Furthermore, in this invention, the angle of the water curtain formed by the first slit nozzle group in the plurality of slit nozzle groups is smaller than that formed by the second slit nozzle group, and the angle of the water curtain formed by the second slit nozzle group is smaller than that formed by the remaining slit nozzle groups. At the same time, the water spray volume of the plurality of slit nozzle groups gradually decreases from front to back. By arranging the angle of the water curtain formed by the slit nozzles and the water spray volume, this invention can achieve the steel plate quenching requirements using relatively inexpensive water under the condition of alloy reduction composition system and with simplified component types. Compared with traditional quenching methods, the quenching cooling rate can be increased by 8-15%. It can give full play to the advantage of inexpensive water replacing alloy additives and effectively solves the problems existing in the prior art.

[0025] Preferably, in this invention, the water spray volume of the later slit nozzle group in the plurality of slit nozzle groups is 80% of the water spray volume of the previous slit nozzle group. This achieves a better quenching effect.

[0026] Preferably, in this invention, two spiral roller groups are arranged after the first slit nozzle group, and one spiral roller group is arranged after the second to fifth slit nozzle groups, so as to achieve the purpose of faster removal of cooling water from the steel plate wall.

[0027] Preferably, each slit nozzle is equipped with an independent control valve group on its pipeline, so that the water flow and pipeline on / off can be controlled individually for each slit nozzle, avoiding mutual interference between slit nozzles during the control process, and thus better optimizing the quenching performance.

[0028] In summary, the present invention provides a full-gap high-pressure roller quenching device and quenching method, which effectively solves the technical problem that the existing technology cannot meet the quenching cooling rate requirements of steel plates under alloy reduction composition system conditions. It breaks the conventional thinking in the field that different types of nozzles should be used for different quenching positions, as detailed below:

[0029] 1. All nozzles in this invention are slit nozzles (or narrow slit nozzles), which fully utilize the strong cooling capacity and uniform cooling characteristics of slit nozzles. By creatively adjusting the angle of the formed water curtain and the amount of water sprayed, the invention achieves the purpose of high-strength cooling of high-temperature steel plates under alloy reduction system conditions, significantly improving the quenching speed and cooling uniformity of the steel plate. This results in a significant improvement in the strength and toughness of the steel plate, as well as the reduction of alloy content and cost.

[0030] In addition, the varying spray angles of the multiple slit nozzles and the gradually decreasing spray volume in this invention enhance the continuous quenching and cooling capacity of the steel plate on the one hand, and effectively remove residual cooling water from the steel plate wall on the other hand, thereby improving the efficient and orderly heat exchange efficiency of the steel plate wall and further enhancing the uniformity of steel plate quenching.

[0031] 2. The roller conveyor system of this invention uses multiple sets of flat rollers as water-blocking rollers to prevent cooling water from flowing back to the high-temperature steel plate wall or into the heat treatment furnace, which is beneficial for controlling the quenching microstructure and properties of the steel plate. One or more sets of spiral rollers are designed after the slit nozzles to effectively remove residual cooling water from the high-temperature steel plate wall and distribute it evenly, significantly improving the heat exchange efficiency and uniformity of the steel plate wall. The steel plate's travel speed can be precisely controlled by individually driving and controlling the spiral rollers with their frequency conversion, thus precisely controlling the quenching process.

[0032] 3. The present invention can also precisely control the gap between the upper and lower rollers of the roller quenching device through a hydraulic lifting system and a servo control system, and realize the switching between constant position control and constant pressure control through closed-loop control, so as to realize the constrained roller quenching process of steel plate, significantly improve the control of plate shape and residual stress after steel plate quenching, and lay the foundation for downstream precision machining of steel plate.

[0033] 4. This invention optimizes several key process parameters of the roller quenching device, such as nozzle type, spray angle, and water volume, to achieve precise and automatic control. This effectively improves the cooling rate and cooling uniformity of the steel plate quenching process. Furthermore, by optimizing parameters such as roller gap and roller speed, it further improves several indicators such as quenched plate shape and residual stress, creating equipment and technical conditions for achieving alloy weight reduction design and strength and toughness improvement of high-strength and high-quality steel plates. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the full-gap high-pressure roller quenching device and quenching method of the present invention;

[0035] Figure 2 A schematic diagram showing the location of the slit nozzle and the relevant position of the steel plate;

[0036] Figure 3 This is a schematic diagram to show the nozzle spacing.

[0037] [Explanation of Labels in the Attached Image]

[0038] 1: Water spray system; 2: Roller conveyor system; 3: Hydraulic lifting system; 4: Steel plate; 5: Slit nozzle; 6: Water supply pipeline; 7: Control valve group; 8: Group 1 slit nozzle; 9: Group 2 slit nozzle; 10: Group 3 slit nozzle; 11: Group 4 slit nozzle; 12: Group 5 slit nozzle; 13: Diverter water collector; 14: Water curtain; 15: Universal joint; 16: Gear motor; 17: Frequency converter; 18: Encoder; 19: Heat treatment furnace; 20: Roller quenching device; 21: Lower transition roller; 22: Water-blocking roller; 23: Spiral roller; 24: Lifting frame; 25: Hydraulic cylinder; 26: Servo control system; 27: Upper spiral roller conveyor; 28: Lower spiral roller conveyor; 29: Displacement sensor; 30: Pressure sensor. Detailed Implementation

[0039] To better explain and facilitate understanding of the present invention, a detailed description of the invention is provided below with reference to the accompanying drawings and specific embodiments. In this document, directional terms such as "upper" and "lower" are used interchangeably with other directional terms. Figure 1 The orientation is used as a reference.

[0040] This invention discloses a full-gap high-pressure roller quenching device and method, comprising a water spray system, a roller conveyor system, and a hydraulic lifting system. The hydraulic lifting system is connected to the roller conveyor system, which forms a steel plate channel for steel plate movement. The water spray system corresponds to the steel plate within the channel and is used to spray the surface of the steel plate. The roller conveyor system includes multiple spiral roller groups, each including two spiral rollers symmetrically arranged on the upper and lower sides of the steel plate. The water spray system includes multiple slit nozzle groups, arranged sequentially along the steel plate's movement direction. A spiral roller group is positioned behind each slit nozzle group. Each slit nozzle group includes two slit nozzles symmetrically arranged on the upper and lower sides of the steel plate. When in use, the slit nozzles spray a water curtain along the steel plate's movement direction, creating an angle between the water curtain and the steel plate wall. In this invention, the water curtain angle formed by the first slit nozzle group is smaller than that formed by the second slit nozzle group, and the water curtain angle formed by the second slit nozzle group is smaller than that formed by the remaining slit nozzle groups. Simultaneously, the water spray volume of the multiple slit nozzle groups gradually decreases from front to back. This invention significantly improves the strength and toughness of steel plates while reducing the amount of alloy material used in the steel plates, thus lowering costs and effectively solving the technical problems existing in the prior art.

[0041] This invention is suitable for quenching and heat treatment of high-strength steel plates with a thickness of 3-350mm, a width of 800-5000mm, and a length of 2-26m.

[0042] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0043] Example 1:

[0044] Reference Figure 1 and Figure 2 This invention provides a full-gap high-pressure roller quenching device. For ease of description, the full-gap high-pressure roller quenching device of this invention is referred to as "roller quenching device 20" in the text. The roller quenching device 20 of this invention includes a water spray system 1, a roller conveyor system 2, and a hydraulic lifting system 3.

[0045] The hydraulic lifting system 3 is connected to the roller conveyor system 2, which forms a steel plate channel for the movement of the steel plate 4. Specifically, the roller conveyor system 2 includes multiple spiral roller groups, each of which includes two sets of spiral rollers 23. The two sets of spiral rollers 23 are symmetrically arranged on the upper and lower sides of the steel plate 4. The gap between the two spiral rollers 23 can be regarded as the steel plate channel for the movement of the steel plate 4. That is, the steel plate 4 is between the two spiral rollers 23, and the rotation of the spiral rollers 23 drives the steel plate 4 to move.

[0046] The hydraulic lifting system 3 includes a lifting frame 24, hydraulic cylinders 25, and a servo control system 26. For ease of description, the spiral roller 23 located above the steel plate 4 and its related components are referred to as the upper spiral roller conveyor 27, and the spiral roller 23 located below the steel plate 4 and its related components are referred to as the lower spiral roller conveyor 28. The upper spiral roller conveyor 27 is installed on the lower side of the lifting frame 24, meaning the lifting frame 24 connects to the spiral roller 23 located above the steel plate 4. The hydraulic cylinder 25 is connected to the upper side of the lifting frame 24. The hydraulic cylinder 25 is controlled by the servo control system 26 to lift and synchronize multiple hydraulic cylinders, thereby enabling the lifting frame 24 and the upper spiral roller conveyor 27 to move up and down, and precisely adjusting the roll gap between the upper spiral roller conveyor 27 and the lower spiral roller conveyor 28. The distance of the hydraulic cylinder 25 rising and falling is measured by the displacement sensor 29 built into the hydraulic cylinder 25 and fed back to the servo control system 26 for position control of the hydraulic cylinder 25. The specific control method is existing technology and will not be described in detail here.

[0047] The water spray system 1 corresponds to the steel plate 4 in the steel plate channel and is used to spray the surface of the steel plate 4 to form a water curtain 14.

[0048] The water spray system 1 includes multiple slit nozzle groups, which are arranged sequentially along the moving direction of the steel plate 4. Figure 1 For reference, Figure 1The middle arrow indicates the direction of movement of steel plate 4. When steel plate 4 moves to the right, multiple slit nozzle groups are arranged along steel plate 4 from left to right. For ease of description, the left side in the figure can be called "front" and the right side can be called "rear".

[0049] Each slit nozzle assembly is followed by a spiral roller assembly. The spiral roller assembly quickly removes cooling water from the steel plate 4 wall. Each slit nozzle assembly includes two slit nozzles 5, symmetrically arranged on the upper and lower sides of the steel plate 4, as shown in the figure. Figure 2 , Figure 2 The arrow in the figure indicates the direction of movement of the steel plate 4. When the slit nozzle 5 is used, it can spray water curtain 14 along the direction of movement of the steel plate. The water curtain 14 forms an angle α with the wall of the steel plate 4.

[0050] In this embodiment, the multiple slit nozzle groups can be named as the first slit nozzle group 8, the second slit nozzle group 9, the third slit nozzle group 10, the fourth slit nozzle group 11, and the fifth slit nozzle group 12, and so on. The water curtain angle α formed by the first slit nozzle group 8 is smaller than the water curtain angle α formed by the second slit nozzle group 9, and the water curtain angle α formed by the second slit nozzle group 9 is smaller than the water curtain angle α formed by the remaining slit nozzle groups. Simultaneously, the water spray volume of the multiple slit nozzle groups gradually decreases from front to back.

[0051] Preferably, the water volume of the subsequent slit nozzle group is 80% of the water volume of the previous slit nozzle group.

[0052] Preferred, refer to Figure 1 Two spiral roller groups are arranged after the first slit nozzle group 8, and one spiral roller group can be arranged after each of the remaining slit nozzle groups. That is, if we take five slit nozzle groups as an example, one spiral roller group is arranged after each of the second slit nozzle groups 9 to the fifth slit nozzle groups 12. The reason for arranging two spiral roller groups after the first slit nozzle group 8 is that the water curtain angle α formed by the first slit nozzle group 8 is smaller and the water spray volume is larger, which requires greater cooling water removal from the steel plate 4 wall.

[0053] Preferably, the water spray system 1 also includes branch water supply pipes 6, control valve groups 7, and diversion collectors 13. The diversion collectors 13 are connected to the water inlet system, and multiple branch water supply pipes 6 branch off from the diversion collectors 13. Each branch water supply pipe 6 is independently connected to a slit nozzle 5, and a control valve group 7 is installed on each branch water supply pipe 6. In this way, each slit nozzle 5 can be supplied with water by a separate branch water supply pipe 6, and the water flow and pipe opening and closing can be controlled by a separate control valve group 7. All branch water supply pipes 6 are supplied with water by the diversion collectors 13. The independent control of water flow and pipe opening and closing for each slit nozzle 5 can avoid mutual interference between slit nozzles 5 and also make the adjustment of each slit nozzle 5 more flexible.

[0054] Preferably, the roller conveyor system 2 also includes a lower transition roller 21 and a water-blocking roller 22. The lower transition roller 21 is located in front of the first slit nozzle group 8 and is used to support the bottom wall of the steel plate 4, thereby receiving the steel plate 4 into the steel plate channel of the roller quenching device 20.

[0055] The water-blocking roller 22 is also positioned in front of the first slit nozzle group 8, and can be positioned between the lower transition roller 21 and the first slit nozzle group 8. The water-blocking roller 22 is used to abut against the wall of the steel plate 4, thereby preventing quenching residual water from flowing back into the heat treatment furnace 19.

[0056] Preferably, one or two lower transition rollers 21 can be arranged. Three sets of water-blocking rollers 22 can be arranged to enhance the water-blocking effect. Each set of water-blocking rollers 22 also consists of two rollers, one upper and one lower, which are arranged correspondingly on the upper and lower sides of the steel plate 4.

[0057] Preferably, the water-blocking roller 22 is also connected to the hydraulic lifting system 3 to achieve lifting. Specifically, for ease of description, the water-blocking roller 22 located above the steel plate 4 is referred to as the upper water-blocking roller conveyor, and the water-blocking roller 22 located below the steel plate 4 is referred to as the lower water-blocking roller conveyor. The upper water-blocking roller conveyor is connected to a lifting frame 24, and a set of hydraulic cylinders 25 are also connected to the upper side of the lifting frame 24. The lifting and lowering of the hydraulic cylinders 25 are also controlled by the servo control system 26, which synchronizes the multiple hydraulic cylinders, thereby enabling the lifting frame 24 and the upper water-blocking roller conveyor to move up and down, and precisely adjust the roller gap between the upper and lower water-blocking roller conveyors. The distance of the hydraulic cylinder 25 rising and falling is measured by the displacement sensor 29 built into the hydraulic cylinder 25 and fed back to the servo control system 26 for position control of the hydraulic cylinder 25. The specific control is also existing technology and will not be described in detail here.

[0058] All rollers in the roller conveyor system 2, such as the spiral roller 23, the lower transition roller 21, and the water-blocking roller 22, are solid rollers with a diameter ≤200mm. All rollers use a transmission method of "roller conveyor - universal joint 15 - geared motor 16 - frequency converter 17 - encoder 18", which is existing technology and will not be described in detail here. When the roller conveyor system 2 is working, before the steel plate 4 enters the roller quenching device 20 of this invention, the servo control system 26 implements a constant position control mode for all hydraulic cylinders 25. After the steel plate 4 enters the roller quenching device 20, the servo control system 26 implements a constant pressure control mode for all hydraulic cylinders 25. The pressure inside the hydraulic cylinder 25 is measured by the pressure sensor 30 installed on the hydraulic cylinder 25 and fed back to the servo control system 26.

[0059] Further explanation: Please refer to the following. Figure 1 — Figure 2The structure, principle, and usage of the present invention will be further elaborated by way of examples. This description is merely a combination of the above-mentioned preferred embodiments for the purpose of facilitating a comprehensive description, but such description is not intended to limit the implementation of the present application. The description is as follows:

[0060] Taking a 50mm thick, 3500mm wide high-strength wear-resistant steel plate (NM450) as an example, the water spray system 1 uses five slit nozzle groups: the first slit nozzle group 8, the second slit nozzle group 9, the third slit nozzle group 10, the fourth slit nozzle group 11, and the fifth slit nozzle group 12. The distance K between the water curtain formed by the first slit nozzle group 8 and the water curtain formed by the second slit nozzle group 9 is 485mm; the distance between the water curtain formed by the second slit nozzle group 9 and the water curtain formed by the third slit nozzle group 10 is 350mm; the distance between the water curtain formed by the third slit nozzle group 10 and the water curtain formed by the fourth slit nozzle group 11 is 350mm; and the distance between the water curtain formed by the fourth slit nozzle group 11 and the water curtain formed by the fifth slit nozzle group 12 is 350mm. The vertical distance between the slit nozzle 5 and the steel plate 4 can be selected from 15-30mm; for example, in this embodiment, 25mm can be selected.

[0061] The first slit nozzle group 8, the second slit nozzle group 9, the third slit nozzle group 10, the fourth slit nozzle group 11, and the fifth slit nozzle group 12 are arranged sequentially from front to back along the steel plate 4.

[0062] All rollers in roller system 2, such as spiral roller 23, lower transition roller 21 and water-blocking roller 22, are solid rollers with a diameter of 200 mm.

[0063] Reference Figure 1 The first slit nozzle group 8 forms a water curtain with an angle of 26° and a slit width H of 2.0 mm. The second slit nozzle group 9 forms a water curtain with an angle of 30° and a slit width H of 2.0 mm. The third to fifth slit nozzle groups 10 each form a water curtain with an angle of 45° and a slit width H of 2.5 mm. The upper and lower slit nozzles 5 in each slit nozzle group are each supplied with water by a separate water supply line 6 and the water flow and line access are controlled by a separate control valve group 7.

[0064] A lower transition roller 21 is arranged between the heat treatment furnace 19 and the roller quenching device 20. Three sets of water-blocking rollers 22 are arranged in front of the first slit nozzle group 8. Two sets of spiral rollers 23 are arranged behind the first slit nozzle group 8. One set of spiral rollers 23 is arranged behind the second slit nozzle group 9 to the fifth slit nozzle group 12.

[0065] Combined with appendix Figure 1After the steel plate 4 is heated to 900℃ and held at that temperature for 20 minutes in the heat treatment furnace 19, the heat treatment furnace 19 sends a signal to the roller quenching device 20 to prepare for tapping. At this time, the diversion water collector 13 receives 6723.2m 3 Cooling water at a pressure of 1.0 MPa is supplied via branch water supply pipes 6 to each slit nozzle 5 in the first to fifth slit nozzle groups 12. Control valve group 7 controls the water flow rate into each slit nozzle 5 from the branch water supply pipes 6. The spray volume of each slit nozzle 5 in the first slit nozzle group 8 is 2000 m³ / h. 3 / h (the spray angle, i.e., the water curtain angle α, is 26°), the water spray volume of each slit nozzle 5 in the second slit nozzle group (9) is 1600m 3 / h (the spray angle, i.e., the water curtain angle α, is 30°), the water spray volume of each slit nozzle 5 in the third slit nozzle group 10 is 1280m³ / h. 3 / h (the spray angle, i.e., the water curtain angle α, is 45°), the water spray volume of each slit nozzle 5 in the fourth slit nozzle group 11 is 1024m³ / h. 3 / h (the spray angle, i.e., the water curtain angle α, is 45°), and the water spray volume of each slit nozzle 5 in the fifth slit nozzle group 12 is 819.2m. 3 / h (the spray angle, i.e., the water curtain angle α, is 45°).

[0066] The reduction motor 16 of the lower transition roller 21, the lower water-blocking roller conveyor, and the spiral lower roller conveyor 28 drives the universal joint shaft 15, which in turn drives the lower transition roller 21, the lower water-blocking roller conveyor, and the spiral lower roller conveyor 28 to rotate at a roller surface linear speed of 3 m / min. The spiral upper roller conveyor 27 and the upper water-blocking roller conveyor rotate counterclockwise, while the lower transition roller 21, the lower water-blocking roller conveyor, and the spiral lower roller conveyor 28 rotate clockwise. The speed accuracy is controlled within ±0.01 m / min by the frequency converter 17, and the actual speed is measured by the encoder 18 and participates in the speed closed-loop control. The servo control system 26 controls the extension and retraction of the hydraulic cylinder 25, which drives the lifting frame 24 and the spiral upper roller conveyor 27 and the upper water-blocking roller conveyor to rise and fall, controlling the roller gap between the spiral upper roller conveyor 27 and the spiral lower roller conveyor 28 to 53±0.1 mm, and at the same time, controlling the roller gap between the upper water-blocking roller conveyor and the lower water-blocking roller conveyor to 53±0.1 mm. The actual roller gap value is measured by the displacement sensor 29 and participates in the position closed-loop control. The control process can be achieved using existing technologies, so it will not be elaborated here.

[0067] After the roller quenching device 20 is ready, the steel plate 4 exits the heat treatment furnace 19 and passes through the lower transition roller 21, the water-blocking roller 22, the first slit nozzle group 8, two sets of spiral rollers 23, the second slit nozzle group 9 and the spiral roller 23 behind it, the third slit nozzle group 10 and the spiral roller 23 behind it, the fourth slit nozzle group 11 and the spiral roller 23 behind it, and the fifth slit nozzle group 12 and the spiral roller 23 behind it before exiting the roller quenching device 20.

[0068] During this process, when the head of the steel plate 4 enters the water-blocking roller 22, the hydraulic lifting system 3 switches from constant position control mode to constant pressure control mode. The servo control system 26 controls the hydraulic cylinder 25 to output a constant single-cylinder pressing force of 10 tons. The pressing force is transmitted to the steel plate 4 through the lifting frame 24, the upper water-blocking roller, the spiral upper roller 27, etc., to constrain the quenching deformation of the steel plate 4. The pressure sensor 30 detects the pressure inside the hydraulic cylinder 25 in real time and participates in the pressure closed-loop control.

[0069] After the tail of the steel plate 4 is removed from the roller quenching device 20, the control valve group 7 controls each branch water supply pipe 6 to shut off the water supply, and the frequency converter 17 controls the reduction motor 16 to stop rotating. At this point, the quenching of the 50mm thick and 3500mm wide high-strength wear-resistant steel plate NM450 is completed. Throughout the entire process, the quenching cooling rate of the high-strength wear-resistant steel plate NM450 from 900℃ to 500℃ can reach 13℃ / second. Compared with the traditional roller quenching machine, which uses a configuration of "1-2 sets of slit inclined jet nozzles + 4-6 sets of multi-row inclined round hole jet nozzles" in the high-pressure section and has a quenching cooling rate of no more than 12℃ / second, the quenching cooling rate of this invention is greatly improved, which can meet the quenching cooling rate requirements of steel plates under the conditions of alloy reduction composition system.

[0070] This invention addresses the problems of insufficient cooling capacity and inability to meet the cooling rate and phase transformation conditions of high-strength steel plates in alloy reduction design systems of existing roller quenching machines. It provides a fully slit high-pressure roller quenching device, in which all nozzles are slit nozzles, with the spray angle and water volume of each nozzle adjusted sequentially to balance cooling capacity and uniformity. Furthermore, the roller conveyor system adopts a transition roller-water-blocking roller-spiral roller arrangement, with each roller driven by a separate motor and its speed precisely controlled by a separate frequency converter, also serving water blocking and drainage functions. The hydraulic lifting system is precisely controlled by a servo control system to control the roller gap, automatically switching between constant pressure / constant position control modes to achieve constrained quenching of the steel plate. This invention solves common industry problems in the roller quenching process of high-strength steel plates, such as low cooling rate, poor cooling uniformity, poor quenched plate shape, and high residual stress, achieving high cooling rate and high flatness steel plate quenching heat treatment, providing an effective equipment and technical solution for reducing alloy content and improving strength and toughness of steel plates.

[0071] In summary, this invention, on the one hand, fully leverages the advantages of the slit nozzle's strong cooling capacity and good controllability to improve the heat exchange efficiency of the steel plate wall; on the other hand, through different spray angle designs, it optimizes the orderly flow of cooling residual water on the steel plate wall, taking into account both cooling capacity and cooling uniformity, thereby achieving high-speed cooling and high-uniformity quenching heat treatment of high-strength steel plates.

[0072] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0073] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," etc., should be interpreted broadly. Those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances.

[0074] In this specification, the term "embodiment," etc., refers to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0075] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A full-gap high-pressure roller quenching device, characterized in that: It includes a water spray system (1), a roller conveyor system (2), and a hydraulic lifting system (3); The hydraulic lifting system (3) is connected to the roller conveyor system (2), which forms a steel plate channel for the steel plate (4) to move; the water spraying system (1) corresponds to the steel plate (4) in the steel plate channel and is used to spray and cool the surface of the steel plate (4). The roller conveyor system (2) includes multiple spiral roller groups, each of which includes two spiral rollers (23) symmetrically arranged on the upper and lower sides of the steel plate (4). The water spraying system (1) includes multiple slit nozzle groups, which are arranged sequentially along the moving direction of the steel plate (4); the spiral roller group is arranged behind each slit nozzle group; each slit nozzle group includes two slit nozzles (5) symmetrically arranged on the upper and lower sides of the steel plate (4), and the slit nozzles (5) spray water curtains along the moving direction of the steel plate so that the water curtain forms an angle with the wall of the steel plate (4) when in use; The angle of the water curtain formed by the first slit nozzle group (8) in the multiple slit nozzle groups is smaller than the angle of the water curtain formed by the second slit nozzle group (9), and the angle of the water curtain formed by the second slit nozzle group (9) is smaller than the angle of the water curtain formed by the other slit nozzle groups. At the same time, the water spray volume of the multiple slit nozzle groups gradually decreases from front to back. The water spray system (1) includes five slit nozzle groups, wherein the water curtain angle formed by the first slit nozzle group (8) is 25-27°, the water curtain angle formed by the second slit nozzle group (9) is 29-31°, and the water curtain angles formed by the third slit nozzle group (10) to the fifth slit nozzle group (12) are the same, all being 44-46°.

2. The full-gap high-pressure roller quenching device as described in claim 1, characterized in that: The water curtain angle formed by the first slit nozzle group (8) is 26°, the water curtain angle formed by the second slit nozzle group (9) is 30°, and the water curtain angle formed by the third slit nozzle group (10) to the fifth slit nozzle group (12) is 45°.

3. The full-gap high-pressure roller quenching device as described in claim 2, characterized in that: The water spray slit width of the slit nozzles in the first slit nozzle group (8) and the second slit nozzle group (9) is 2.0 mm; the water spray slit width of the slit nozzles in the third slit nozzle group (10) to the fifth slit nozzle group (12) is 2.5 mm.

4. The full-gap high-pressure roller quenching device as described in claim 2, characterized in that: Two spiral roller groups are arranged after the first slit nozzle group (8), and one spiral roller group is arranged after the second slit nozzle group (9) to the fifth slit nozzle group (12).

5. The full-gap high-pressure roller quenching device as described in claim 1, characterized in that: The water volume of the next slit nozzle group in a multi-slit nozzle group is 80% of the water volume of the previous slit nozzle group.

6. The full-gap high-pressure roller quenching device as described in claim 1, characterized in that: The spacing between two adjacent slit nozzle groups is 350mm-700mm.

7. The full-gap high-pressure roller quenching device as described in claim 1, characterized in that: It also includes a lower transition roller (21) and a water-blocking roller (22); The lower transition roller (21) is located in front of the first slit nozzle group (8) and is used to support the bottom wall of the steel plate (4) and thus receive the steel plate (4) as it enters the steel plate channel. The water-blocking roller (22) is positioned in front of the first slit nozzle group (8) to abut against the wall of the steel plate (4), thereby preventing the quenching residual water from entering the heat treatment furnace (19) in reverse.

8. A full-gap high-pressure roller quenching device as described in any one of claims 1-7, characterized in that: Each of the slit nozzles (5) is equipped with a control valve group (7) on the pipeline connecting them, so that each slit nozzle (5) can control the water flow and pipeline opening and closing individually.

9. A full-gap high-pressure roller quenching method, characterized in that: The method is implemented using a full-gap high-pressure roller quenching device as described in any one of claims 1-8; The method includes: introducing the steel plate (4) from the heat treatment furnace (19) into the steel plate channel and moving it within the steel plate channel; activating multiple slit nozzle groups, spraying water curtains onto the top and bottom walls of the steel plate (4) using the multiple slit nozzle groups during the movement of the steel plate (4), and making the water curtain form an angle with the wall of the steel plate (4); controlling the angle of the water curtain formed by the first slit nozzle group (8) to be smaller than the angle of the water curtain formed by the second slit nozzle group (9), and the angle of the water curtain formed by the second slit nozzle group (9) to be smaller than the angle of the water curtain formed by the remaining slit nozzle groups, while controlling the water spray volume of the multiple slit nozzle groups to gradually decrease from front to back.

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