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

Abstract

The invention relates to a full-gap high-pressure roller type quenching device and a quenching method. The full-gap high-pressure roller type quenching device comprises a water spraying system, a roller way system and a hydraulic lifting system. The roller way system comprises a plurality of spiral roller sets, and each spiral roller set comprises two spiral rollers symmetrically arranged on the upper side and the lower side of the steel plate. The water spraying system comprises a plurality of gap nozzle sets. And a spiral roller group is correspondingly arranged behind each gap nozzle group. Each gap nozzle set comprises two gap nozzles symmetrically arranged on the upper side and the lower side of the steel plate, and when the gap nozzles are used, a water curtain is sprayed in the moving direction of the steel plate so that a water curtain included angle can be formed between the water curtain and the wall face of the steel plate. The water curtain included angle formed by the first gap nozzle set is smaller than the water curtain included angle formed by the second gap nozzle set, the water curtain included angle formed by the second gap nozzle set is smaller than the water curtain included angles formed by the other gap nozzle sets, and the water spraying amount of the gap nozzle sets is gradually decreased. The steel plate alloy can be reduced, the cost is reduced, and the problems existing in the prior art are well solved.

Description

Technical Field

[0001] The invention belongs to the technical field of heat treatment of steel plates, and relates to a full-gap high-pressure roller quenching device and a quenching method for steel plates. Background Art

[0002] High-strength high-quality steel plates are key raw materials in the fields of equipment manufacturing, transportation, petrochemicals, military industry, etc., and are crucial to the large-scale, safe and stable operation of equipment. After rolling and forming, such steel plates need to be heat treated, and different heating and cooling systems are used to control the structure and shape of the steel plates to obtain better performance. Since the roller quenching machine has the advantages of high cooling intensity, uniform quenching, high control accuracy, and continuous production, it has become the main quenching equipment for high-strength high-quality steel plates.

[0003] However, as users' requirements for the performance and quality of high-strength qualified steel plates gradually increase, the contradiction between improving the strength and toughness of steel plates and special service properties on the one hand, and reducing the amount of ingredients and improving low-cost production on the other hand, has become increasingly prominent, forcing steel plate manufacturers to focus on the last link in changing the performance and appearance quality of steel plates - roller quenching. They strive to further improve the cooling capacity of equipment through the research and development of new devices or breakthroughs in new technologies, give full play to the advantages of cheap water instead of alloy additions, and simultaneously achieve alloy reduction and performance improvement of high-strength qualified steel plates. However, no ideal results have been achieved so far.

[0004] It is known from heat transfer that during the quenching process of high-temperature steel plates after leaving the heat treatment furnace, surface heat exchange determines the internal heat conduction, which in turn affects the cooling rate of the entire plate. The high-pressure section of the traditional roller quenching machine adopts the configuration of "1 to 2 groups of slit inclined jet nozzles + 4 to 6 groups of multi-row inclined circular hole jet nozzles" to achieve a "strong → weak" cooling process, which conforms to the phase change law of continuous cooling transformation of conventional steel plates and can meet the requirements of the core quenching cooling rate of conventional component quenched and tempered steel plates. However, with the addition of less or no rare alloy elements such as nickel, chromium, molybdenum, and vanadium to improve hardenability, the hardenability of the steel plate deteriorates, and a larger quenching cooling rate is required to meet the phase change thermodynamic conditions. To this end, it is necessary to improve the cooling capacity of the high-pressure section of the roller quenching machine to further improve the wall heat exchange capacity of the high-temperature steel plate, but there is currently no way to meet the requirements.

[0005] In addition, among the existing patents, the Chinese patent application (Announcement No. CN108070699B) proposes a high-pressure cooling device for a steel plate roller quenching machine, including a roller system, a water spray system and a water supply system. The invention adopts an arrangement of 2 groups of slit nozzles + 4 groups of inclined high-density nozzles to form a high-pressure cooling zone. It belongs to the traditional roller quenching machine configuration mode and cannot solve the above-mentioned problems.

[0006] The Chinese patent application (publication number CN114672627A) proposes a symmetrical restrained 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, respectively using 1-2 groups of narrow slit nozzles, multiple groups of inclined fan-shaped nozzles and multiple rows of round hole nozzles. This device also fails to solve the above-mentioned problems.

[0007] The Chinese patent application (Announcement No. CN103834791B) proposes a continuous roller quenching 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 area water spraying system is equipped with a slit nozzle and multiple rows of high-density inclined circular hole jet nozzles, which are arranged alternately. The type, arrangement and number of nozzles in this configuration also belong to the traditional roller quenching machine configuration, and cannot solve the above-mentioned problems.

[0008] The above patents all adopt the traditional "slit (or slit, narrow slit) nozzle + multiple rows of inclined circular hole (or fan-shaped) nozzle" quenching machine high-pressure section nozzle configuration. Although it meets the existing steel plate alloy composition system (containing appropriate amounts of rare and precious alloys such as nickel, chromium, molybdenum, vanadium, etc.), it cannot meet the steel plate quenching cooling rate requirements under the conditions of the alloy reduction composition system. Summary of the invention

[0009] 1. Technical issues to be resolved

[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 a quenching method, which solve the technical problem in the prior art that the steel plate quenching cooling rate requirements under the conditions of the alloy reduction component system cannot be met.

[0011] (II) Technical solution

[0012] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0013] In the first aspect, an embodiment of the present invention provides a full-gap high-pressure roller quenching device, including a water spraying system, a roller system and a hydraulic lifting system. The hydraulic lifting system is connected to the roller system, and the roller system forms a steel plate channel for the steel plate to move; the water spraying system corresponds to the steel plate in the channel and is used to spray the surface of the steel plate. The roller system includes a plurality of spiral roller groups, and each of the spiral roller groups includes two spiral rollers symmetrically arranged on the upper and lower sides of the steel plate. The water spraying system includes a plurality of slit nozzle groups, and the plurality of slit nozzle groups are arranged in sequence along the moving direction of the steel plate. 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 the slit nozzle is in use, a water curtain is sprayed along the moving direction of the steel plate so that the water curtain forms a water curtain angle with the wall of the steel plate. The water curtain angle formed by the first slit nozzle group among the multiple slit nozzle groups is smaller than the water curtain angle formed by the second slit nozzle group, and the water curtain angle formed by the second slit nozzle group is smaller than the water curtain angles 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 angles formed by the third to fifth slit nozzle groups are all 45°.

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

[0017] Further optionally, two spiral roller groups are arranged after the first slit nozzle group, and one spiral roller group is arranged after the second slit nozzle group to the fifth slit nozzle group.

[0018] Further optionally, the water spraying amount of a subsequent slit nozzle group among the multiple slit nozzle groups is 80% of the water spraying amount of a previous slit nozzle group.

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

[0020] Optionally, it further includes a lower transition roller and a water-blocking roller. The lower transition roller is located in front of the first gap nozzle group, and is used to support the bottom wall of the steel plate, thereby receiving the steel plate into the steel plate channel. The water-blocking roller is arranged in front of the first gap nozzle group, and is used to abut against the wall of the steel plate, thereby preventing the quenching residual water from reversely entering the heat treatment furnace.

[0021] Further optionally, a control valve group is provided on the pipeline connecting each slit nozzle, so that each slit nozzle can individually control the water flow and the on-off of the pipeline.

[0022] In the second aspect, an embodiment of the present invention provides a full-gap high-pressure roller quenching method, which is implemented using the above-mentioned full-gap high-pressure roller quenching device. The method includes: introducing a steel plate coming out of a heat treatment furnace into a steel plate channel and moving it in the steel plate channel. Start multiple slit nozzle groups, and use multiple slit nozzle groups to spray water curtains on the top and bottom walls of the steel plate during the movement of the steel plate, and make the water curtain form a water curtain angle with the wall of the steel plate. In this process, the water curtain angle formed by the first slit nozzle group is controlled to be smaller than the water curtain angle formed by the second slit nozzle group, and the water curtain angle formed by the second slit nozzle group is smaller than the water curtain angle formed by the remaining slit nozzle groups. At the same time, the water spraying amount of the multiple slit nozzle groups is controlled to gradually decrease from front to back.

[0023] (III) Beneficial effects

[0024] The beneficial effects of the present invention are as follows: a full-gap high-pressure roller quenching device of the present invention comprises a water spraying system, a roller system and a hydraulic lifting system. The roller system comprises a plurality of spiral roller groups, through which cooling water on the wall of the steel plate is quickly removed, and most importantly, the water spraying system of the present invention comprises a plurality of slot nozzle groups, that is, the present invention adopts slot nozzles for quenching, and each slot nozzle group comprises two slot nozzles symmetrically arranged on the upper and lower sides of the steel plate, and when the slot nozzle is used, a water curtain is sprayed along the moving direction of the steel plate so that the water curtain forms a water curtain angle with the wall of the steel plate. The method of quenching with such full-gap nozzles can eliminate the need to select a variety of nozzles for construction, simplify the workpiece selection procedure, and at the same time, avoid the cumbersome construction and maintenance process caused by different nozzle structures and models. Moreover, the water curtain angle formed by the first slit nozzle group among the multiple slit nozzle groups of the present invention is smaller than the water curtain angle formed by the second slit nozzle group, and the water curtain angle formed by the second slit nozzle group is smaller than the water curtain angle formed by the remaining slit nozzle groups. At the same time, the water spraying amount of the multiple slit nozzle groups gradually decreases from front to back. By arranging the angle change of the water curtain angle formed by the slit nozzles and the change of the water spraying amount, the present invention can use relatively low-cost water to achieve the steel plate quenching requirements under the conditions of the alloy reduction component system while simplifying the types of components used. Compared with the traditional quenching method, the quenching cooling rate can be increased by 8-15%. It can give full play to the advantages of cheap water instead of alloy additions, and well solve the problems existing in the prior art.

[0025] Preferably, the water spraying amount of the last slit nozzle group among the multiple slit nozzle groups of the present invention is 80% of the water spraying amount of the previous slit nozzle group, so as to achieve a better quenching effect.

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

[0027] Preferably, an independent control valve group is provided on the pipeline connecting each slit nozzle, so that the water flow and pipeline connection and disconnection can be controlled individually for each slit nozzle, avoiding mutual influence between the slit nozzles during the control process, thereby better optimizing the quenching performance.

[0028] In summary, the full-gap high-pressure roller quenching device and quenching method provided by the present invention well solve the technical problem that the prior art cannot meet the requirements of the quenching cooling rate of steel plates under the conditions of the alloy reduction component system, and break the mindset that different types of nozzles need to be used for different quenching positions in the art, as follows:

[0029] 1. The nozzles of the present invention all adopt slit nozzles (or slit nozzles), which fully utilize the characteristics of strong cooling capacity and uniform cooling of slit nozzles, and creatively achieve the purpose of high-intensity cooling of high-temperature steel plates under the conditions of alloy reduction component system by adjusting the angle of the formed water curtain and the change of the water spraying amount, significantly improving the quenching cooling rate and cooling uniformity of the steel plate, thereby achieving a significant improvement in the strength and toughness of the steel plate on the one hand, and achieving steel plate alloy reduction and cost reduction on the other hand.

[0030] In addition, the spray angles of the multiple groups of slit nozzles in the present invention change and the water spray volume gradually decreases, which, on the one hand, improves the continuous quenching cooling capacity of the steel plate, and on the other hand, can effectively realize the removal of residual cooling water on the steel plate wall, improve the efficient and orderly heat exchange efficiency of the steel plate wall, and further improve the quenching uniformity of the steel plate.

[0031] 2. The roller system of the present invention uses multiple sets of flat rollers as water-retaining rollers to prevent cooling water from returning to the wall of the high-temperature steel plate or the heat treatment furnace, which is beneficial to the control of the quenching structure and performance of the steel plate. One or more sets of spiral rollers are designed after the slit nozzle to effectively remove the residual cooling water on the wall of the high-temperature steel plate and distribute it evenly, significantly improving the heat exchange efficiency and uniformity of the steel plate wall. The steel plate travel speed can be accurately controlled by the separate transmission and separate frequency conversion control of the spiral rollers, and the quenching process can be accurately controlled.

[0032] 3. The present invention can also accurately control the roller gap between the upper roller and the lower roller of the roller quenching device through the hydraulic lifting system and the servo control system, and realize the switching between constant position control and constant pressure control through closed-loop control, thereby realizing the constrained roller quenching process of the steel plate, significantly improving the plate shape and residual stress control of the steel plate after quenching, and laying the foundation for the downstream precise machining of the steel plate.

[0033] 4. The present invention optimizes several key process parameters such as the nozzle form, spray angle, and water spray volume of the roller quenching device to achieve precise and automatic control, effectively improving the cooling rate and cooling uniformity of the steel plate quenching process, and further improving several indicators such as the quenched plate shape and residual stress by optimizing parameters such as the roll gap and roll speed, thereby creating equipment and technical conditions for achieving alloy reduction design and toughness improvement of high-strength tempered steel plates. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0035] Figure 2 A schematic diagram showing the relative positions of the gap nozzle and the steel plate;

[0036] Figure 3 A schematic diagram showing the nozzle spacing.

[0037] [Description of Reference Numerals]

[0038] 1: water spraying system; 2: roller system; 3: hydraulic lifting system; 4: steel plate; 5: gap nozzle; 6: water supply pipeline; 7: control valve group; 8: the first group of gap nozzles; 9: the second group of gap nozzles; 10: the third group of gap nozzles; 11: the fourth group of gap nozzles; 12: the fifth group of gap nozzles; 13: diverter and water collector; 14: water curtain; 15: universal joint; 16: reduction motor; 17: frequency converter; 18: encoder; 19: heat treatment furnace; 20: roller quenching device; 21: lower transition roller; 22: water retaining roller; 23: spiral roller; 24: lifting frame; 25: hydraulic cylinder; 26: servo control system; 27: upper roller of spiral roller; 28: lower roller of spiral roller; 29: displacement sensor; 30: pressure sensor. DETAILED DESCRIPTION

[0039] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below in conjunction with the accompanying drawings through specific embodiments. Figure 1 The orientation is used as a reference.

[0040] A full-gap high-pressure roller quenching device and a quenching method proposed in an embodiment of the present invention include a water spraying system, a roller system and a hydraulic lifting system. The hydraulic lifting system is connected to the roller system, and the roller system forms a steel plate channel for the steel plate to move. The water spraying system corresponds to the steel plate in the steel plate channel and is used to spray the surface of the steel plate. The roller system includes a plurality of spiral roller groups, and each spiral roller group includes two spiral rollers symmetrically arranged on the upper and lower sides of the steel plate. The water spraying system includes a plurality of slit nozzle groups, and the plurality of slit nozzle groups are arranged in sequence along the moving direction of the steel plate. 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 the slit nozzle is in use, a water curtain is sprayed along the moving direction of the steel plate so that the water curtain forms a water curtain angle with the wall of the steel plate. The water curtain angle formed by the first slit nozzle group among the multiple slit nozzle groups is smaller than the water curtain angle formed by the second slit nozzle group, and the water curtain angle formed by the second slit nozzle group is smaller than the water curtain angles formed by the remaining slit nozzle groups. At the same time, the water spraying amount of the multiple slit nozzle groups gradually decreases from front to back. On the one hand, the present invention can significantly improve the strength and toughness of the steel plate, and on the other hand, it can reduce the alloy content of the steel plate and reduce the cost, which well solves the technical problems existing in the prior art.

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

[0042] In order to better understand the above technical solution, 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 accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0043] Embodiment 1:

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

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

[0046] The hydraulic lifting system 3 includes a lifting frame 24, a hydraulic cylinder 25 and a servo control system 26. For ease of description, the spiral roller 23 and its related components located above the steel plate 4 are described as the spiral roller upper roller 27, and the spiral roller 23 and its related components located below the steel plate 4 are described as the spiral roller lower roller 28. The spiral roller upper roller 27 is installed on the lower side of the lifting frame 24, that is, the lifting frame 24 is connected to the spiral roller 23 located above the steel plate 4, and 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 lower and synchronize multiple hydraulic cylinders, thereby driving the lifting frame 24 and the spiral upper roller 27 to move up and down, and the roller gap between the spiral upper roller 27 and the spiral lower roller 28 can be accurately adjusted. The rising and falling distances of the hydraulic cylinder 25 are 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 the existing technology and will not be repeated here.

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

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

[0049] A spiral roller group is arranged behind each slit nozzle group. The spiral roller group can quickly remove cooling water from the wall of the steel plate 4. Each slit nozzle group includes two slit nozzles 5, which are symmetrically arranged on the upper and lower sides of the steel plate 4. Figure 2 , Figure 2 The arrow in the figure indicates the moving direction of the steel plate 4. When the slit nozzle 5 is used, a water curtain 14 can be sprayed along the moving direction of the steel plate. The water curtain 14 forms a water curtain angle α with the wall surface of the steel plate 4.

[0050] In this embodiment, the plurality of 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. At the same time, the water spraying amount of the plurality of slit nozzle groups gradually decreases from front to back.

[0051] Preferably, the water spraying amount of the latter slit nozzle group is 80% of the water spraying amount of the former slit nozzle group.

[0052] Preferably, refer to Figure 1 , two spiral roller groups are arranged behind the first slot nozzle group 8, and one spiral roller group can be arranged behind the other slot nozzle groups, that is, if five slot nozzle groups are taken as an example, one spiral roller group is arranged behind each of the second slot nozzle group 9 to the fifth slot nozzle group 12. The arrangement of two spiral roller groups behind the first slot nozzle group 8 is based on the fact that the water curtain angle α formed by the first slot nozzle group 8 is smaller and the water spray volume is larger, and the need to remove cooling water from the wall of the steel plate 4 is greater.

[0053] Preferably, the water spray system 1 also includes a branch water supply pipeline 6, a control valve group 7 and a diverter manifold 13, etc. The diverter manifold 13 is connected to the water inlet system, and a plurality of branch water supply pipelines 6 are divided from the diverter manifold 13, each branch water supply pipeline 6 is independently connected to the slit nozzle 5, and a control valve group 7 is arranged on each branch water supply pipeline 6, so that each slit nozzle 5 can be supplied with water by a separate branch water supply pipeline 6 and the water flow rate and pipeline opening and closing are controlled by a separate control valve group 7, and each branch water supply pipeline 6 is uniformly supplied with water by the diverter manifold 13. The separate control of the water flow rate and pipeline opening and closing of each slit nozzle 5 can avoid mutual interference between the slit nozzles 5, and can also make the adjustment of each slit nozzle 5 more flexible.

[0054] Preferably, the roller system 2 further includes a lower transition roller 21 and a water retaining roller 22. The lower transition roller 21 is located in front of the first gap nozzle group 8, and is used to support the bottom wall of the steel plate 4, and then receive the steel plate 4 into the steel plate channel of the roller quenching device 20.

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

[0056] Preferably, 1 to 2 lower transition rollers 21 can be arranged. Three groups of water-blocking rollers 22 can be arranged to enhance the water-blocking effect. Each group of water-blocking rollers 22 also has two upper and lower water-blocking rollers 22, which are arranged on the upper and lower sides of the steel plate 4 correspondingly.

[0057] Preferably, the water retaining roller 22 is also connected to the hydraulic lifting system 3 to achieve lifting. Specifically, for ease of description, the water retaining roller 22 located above the steel plate 4 is called the upper water retaining roller, and the water retaining roller 22 located below the steel plate 4 is called the lower water retaining roller. The upper water retaining roller is connected to a lifting frame 24, and a group of hydraulic cylinders 25 are also connected to the upper side of the lifting frame 24. The hydraulic cylinder 25 is also controlled by the servo control system 26 to lift and synchronize with multiple hydraulic cylinders, thereby driving the lifting frame 24 and the upper water retaining roller to move up and down, and accurately adjusting the roller gap between the upper water retaining roller and the lower water retaining roller. 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 a prior art and will not be repeated here.

[0058] All rollers in the roller system 2, such as the spiral roller 23, the lower transition roller 21 and the water retaining roller 22, are solid rollers with a roller diameter of ≤200 mm. All rollers adopt the transmission mode of "roller-universal joint 15-reduction motor 16-frequency converter 17-encoder 18", which is a prior art and will not be described here. When the roller system 2 is working, before the steel plate 4 enters the roller quenching device 20 of the present 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 in 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: See below Figure 1 — Figure 2, the structure, principle, use process, etc. of the present invention are further sorted out in the form of examples. This description is only to combine the above-mentioned multiple preferred methods in an illustrative manner to facilitate a comprehensive description, but this description is not a limitation on the implementation methods of the present application. The description is as follows:

[0060] Take the 50mm thick and 3500mm wide high-strength wear-resistant steel plate NM450 as an example. The water spray system 1 uses five slit nozzle groups, namely 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 spacing 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 spacing 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 spacing between the water curtain of the third slit nozzle group 10 and the water curtain of the fourth slit nozzle group 11 is 350mm, and the spacing between the water curtain of 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 as 15-30mm, for example, 25mm can be selected in this embodiment.

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

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

[0063] Reference Figure 1 , where the water curtain angle formed by the first slit nozzle group 8 is 26°, and the water spraying slit width H is 2.0mm. The water curtain angle formed by the second slit nozzle group 9 is 30°, and the water spraying slit width H is 2.0mm. The water curtain angles formed by the third slit nozzle group 10 to the fifth slit nozzle group 12 are all 45°, and the water spraying slit width H is 2.5mm. The upper and lower slit nozzles 5 in each slit nozzle group are respectively supplied with water by separate water supply pipelines 6, and the water flow and pipeline opening and closing are controlled by separate control valve groups 7.

[0064] A lower transition roller 21 is arranged between the heat treatment furnace 19 and the roller quenching device 20, three groups of water-retaining rollers 22 are arranged in front of the first slot nozzle group 8, two groups of spiral rollers 23 are arranged behind the first slot nozzle group 8, and one group of spiral rollers 23 is arranged behind the second slot nozzle group 9 to the fifth slot nozzle group 12.

[0065] Combined with Figure 1After the steel plate 4 is heated to 900°C by the heat treatment furnace 19 and kept at this temperature for 20 minutes, the heat treatment furnace 19 sends a signal to the roller quenching device 20 to prepare for steel tapping. At this time, the diverter and collector 13 receives 6723.2m 3 / h, 1.0MPa cooling water, the cooling water enters each slit nozzle 5 in the first slit nozzle group 8 to the fifth slit nozzle group 12 through each branch water supply pipeline 6, and the control valve group 7 controls the water flow rate of each branch water supply pipeline 6 entering the slit nozzle 5. The water spraying amount of each slit nozzle 5 in the first slit nozzle group 8 is 2000m 3 / h (the spray angle, i.e., the water curtain angle α, is 26°), and the water spraying amount 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°), and the water spraying amount of each slit nozzle 5 in the third slit nozzle group 10 is 1280m 3 / h (the spray angle, i.e., the water curtain angle α, is 45°), and the water spraying amount of each slit nozzle 5 in the fourth slit nozzle group 11 is 1024m 3 / h (the spray angle, i.e., the water curtain angle α, is 45°), and the water spraying amount 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 universal joint 15 is driven by the reduction motor 16 of the lower transition roller 21, the lower water retaining roller and the spiral lower roller 28, and then the lower transition roller 21, the lower water retaining roller and the spiral lower roller 28 are driven to rotate at a roller surface linear speed of 3m / min. The spiral upper roller 27 and the upper water retaining roller are reversed counterclockwise, while the lower transition roller 21, the lower water retaining roller and the spiral lower roller 28 are clockwise. The speed accuracy is controlled within ±0.01m / min by the frequency converter 17. 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 contraction of the hydraulic cylinder 25, drives the lifting frame 24 and the spiral upper roller 27 and the upper water retaining roller to rise and fall, and controls the roller gap between the spiral upper roller 27 and the spiral lower roller 28 to 53±0.1mm, and the roller gap between the upper water retaining roller and the lower water retaining roller is also controlled to 53±0.1mm. The actual roller gap value is measured by the displacement sensor 29 and participates in the position closed loop control. The control process can adopt existing technology and will not be described in detail here.

[0067] After the roller quenching device 20 is ready, the steel plate 4 leaves the heat treatment furnace 19, passes through the lower transition roller 21, the water-retaining roller 22, the first slit nozzle group 8, two groups 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, the fifth slit nozzle group 12 and the spiral roller 23 behind it, and then moves out of the roller quenching device 20.

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

[0069] When the tail of the steel plate 4 moves out of the roller quenching device 20, the control valve group 7 controls each branch water supply pipeline 6 to close 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. During the whole 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 quenching cooling rate of no more than 12℃ / second in the configuration form of "1 to 2 groups of slit inclined jet nozzles + 4 to 6 groups of multiple rows of inclined circular hole jet nozzles" in the high-pressure section of the traditional roller quenching machine, the quenching cooling rate of the present invention is greatly improved, which can meet the quenching cooling rate requirements of the steel plate under the conditions of the alloy reduction component system.

[0070] The present invention aims at the problems that the existing roller quenching machine has insufficient cooling capacity and cannot meet the cooling rate and phase change conditions of high-strength tempered steel plates in the alloy reduction component design system. A full-gap high-pressure roller quenching device is provided. All the nozzles are slit nozzles, and the spray angles of each slit nozzle are adjusted in sequence, and the water spray volume is reduced in sequence, taking into account both cooling capacity and cooling uniformity. In addition, the roller system adopts a transition roller-water retaining roller-spiral roller arrangement. Each roller is driven by a separate motor and a separate frequency converter accurately controls the roller speed, taking into account functions such as water retaining and drainage. The hydraulic lifting system accurately controls the roller gap by a servo control system, automatically switches to a constant pressure / constant position control mode, and realizes constrained quenching of steel plates. The present invention solves the common problems in the industry such as low cooling rate, poor cooling uniformity, poor quenching plate shape, and large residual stress of steel plates during the roller quenching process of high-strength tempered steel plates, realizes high cooling rate and high flatness steel plate quenching heat treatment, and provides an effective equipment technology solution for alloy reduction and toughness improvement of steel plates.

[0071] In summary, on the one hand, the present invention fully utilizes the advantages of strong cooling capacity and good controllability of the gap nozzle to improve the heat exchange efficiency of the steel plate wall. On the other hand, through the design of different injection angles, the orderly flow of residual cooling water on the steel plate wall is optimized, taking into account the cooling capacity and cooling uniformity, and realizing high-strength quality steel plate high cooling rate and high cooling uniformity quenching heat treatment.

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

[0073] In the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection" and the like should be understood in a broad sense. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0074] In the description of this specification, the description of the term "embodiment" and the like refers to the specific features, structures, materials or characteristics described in conjunction with the embodiment or example included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they contradict each other.

[0075] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A full-gap high-pressure roller quenching device, characterized in that: It comprises a water spray system (1), a roller system (2) and a hydraulic lifting system (3); The hydraulic lifting system (3) is connected to the roller system (2), and the roller system (2) 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 system (2) comprises a plurality of spiral roller groups, each of the spiral roller groups comprises two spiral rollers (23) symmetrically arranged on the upper and lower sides of the steel plate (4); The water spray system (1) comprises a plurality of slit nozzle groups, wherein the plurality of slit nozzle groups are arranged in sequence along the moving direction of the steel plate (4); the spiral roller group is arranged correspondingly behind each slit nozzle group; each slit nozzle group comprises two slit nozzles (5) symmetrically arranged on the upper and lower sides of the steel plate (4); when the slit nozzles (5) are used, they spray a water curtain along the moving direction of the steel plate so that the water curtain forms a water curtain angle with the wall surface of the steel plate (4); The water curtain angle formed by the first slit nozzle group (8) among the multiple slit nozzle groups is smaller than the water curtain angle formed by the second slit nozzle group (9), and the water curtain angle formed by the second slit nozzle group (9) is smaller than the water curtain angles formed by the remaining slit nozzle groups. At the same time, the water spraying amount of the multiple slit nozzle groups gradually decreases from front to back.

2. A full-gap high-pressure roller quenching device as claimed in claim 1, characterized in that: The water spray system (1) comprises five slit nozzle groups, wherein the water curtain angle formed by the first slit nozzle group (8) is 25 to 27 degrees, the water curtain angle formed by the second slit nozzle group (9) is 29 to 31 degrees, 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 to 46 degrees.

3. A full-gap high-pressure roller quenching device as claimed in claim 2, 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 angles formed by the third slit nozzle group (10) to the fifth slit nozzle group (12) are all 45°.

4. A full-gap high-pressure roller quenching device as claimed in claim 3, characterized in that: The water spraying slit widths of the slit nozzles in the first slit nozzle group (8) and the second slit nozzle group (9) are 2.0 mm; and the water spraying slit widths of the slit nozzles in the third slit nozzle group (10) to the fifth slit nozzle group (12) are 2.5 mm.

5. A full-gap high-pressure roller quenching device as claimed in claim 3, characterized in that: Two spiral roller groups are arranged behind the first slit nozzle group (8), and one spiral roller group is arranged behind the second slit nozzle group (9) to the fifth slit nozzle group (12).

6. A full-gap high-pressure roller quenching device as claimed in claim 1, characterized in that: The water spraying amount of the latter slit nozzle group among the plurality of slit nozzle groups is 80% of the water spraying amount of the former slit nozzle group.

7. A full-gap high-pressure roller quenching device according to claim 1, characterized in that: The distance between two adjacent slit nozzle groups is 350 mm to 700 mm.

8. A full-gap high-pressure roller quenching device as claimed in claim 1, characterized in that: It also includes a lower transition roller (21) and a water retaining 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 then receive the steel plate (4) into the steel plate channel; The water-blocking roller (22) is arranged in front of the first slit nozzle group (8) and is used to abut against the wall surface of the steel plate (4), thereby preventing quenching residual water from reversely entering the heat treatment furnace (19).

9. A full-gap high-pressure roller quenching device according to any one of claims 1 to 8, characterized in that: A control valve group (7) is provided on the pipeline connecting each of the slit nozzles (5), so that each of the slit nozzles (5) can independently control the water flow rate and the on-off of the pipeline.

10. 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 to 9; The method comprises: introducing the steel plate (4) coming out of the heat treatment furnace (19) into the steel plate channel and moving it in the steel plate channel; starting a plurality of the slit nozzle groups, and using the plurality of the slit nozzle groups to spray a water curtain on the top and bottom walls of the steel plate (4) during the movement of the steel plate (4), so that the water curtain forms a water curtain angle with the wall of the steel plate (4); in this process, the water curtain angle formed by the first slit nozzle group (8) is controlled to be smaller than the water curtain angle formed by the second slit nozzle group (9), and the water curtain angle formed by the second slit nozzle group (9) is smaller than the water curtain angles formed by the remaining slit nozzle groups, and at the same time, the water spraying amount of the plurality of slit nozzle groups is controlled to gradually decrease from front to back.

Images