Safety system and method of steel ladle tilting device

Abstract

The invention relates to the technical field of steel ladles, in particular to a safety system and method of a steel ladle tilting device. Comprising an energy storage system, an O-shaped electromagnetic directional valve, a balance valve, a hydraulic cylinder, a first unloading oil way and a second unloading oil way. The energy storage system is connected with an oil tank pipeline, and the energy storage system and the O-shaped electromagnetic directional valve are connected with a balance valve pipeline; the balance valve is directly integrated at an oil port of the hydraulic cylinder or connected with a pipeline of the hydraulic cylinder; one end of the first unloading oil way is connected with a rodless cavity oil port of the hydraulic cylinder, and the other end is connected with the main oil return pipeline; and one end of the second unloading oil way is connected with a rod cavity oil port of the hydraulic cylinder, and the other end is connected with the main oil return pipeline. The major potential safety hazards such as accidental steel ladle tipping and molten steel pouring interruption or falling caused by failure of a hydraulic system, electrical failure or sudden power failure in the prior art are solved, and the continuity and safety of the steel smelting process are ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel ladle, in particular to a safety system and method of a steel ladle tilting device. BACKGROUND

[0002] The steel ladle, also known as a ladle or a pouring ladle, is a key equipment in the metallurgical industry (such as steel smelting and casting) for holding, transporting and pouring high-temperature molten steel. It undertakes the task of transferring molten steel from a steelmaking furnace to a continuous casting machine or a mold casting link, directly affecting production safety and efficiency. The molten steel yield of the steel ladle is an important process indicator for continuous casting design, and the molten steel yield can increase the production of cast slabs, thereby reducing the production cost per unit of cast slab. During use, due to the structure of the steel ladle and the erosion of the molten steel, about 2-5 tons of molten steel remains in the steel ladle, making it impossible to improve the molten steel yield. At the present stage, the steel ladle tilting device changes the placement angle of the steel ladle, which can more effectively collect the remaining molten steel at the steel ladle's water outlet, ultimately achieving the excellent effect of improving the molten steel yield, reducing the cost per ton of steel, and improving production efficiency.

[0003] Chinese patent application No. 10102731A discloses a method for reducing the amount of residual molten steel in a steel ladle, which sets a lifting hydraulic cylinder at the bottom of a steel ladle weighing platform to make the steel ladle have a tilting function, and determines the tilting angle according to the number of pouring times of the steel ladle, thereby effectively reducing the amount of residual molten steel in the steel ladle and reducing production costs. However, the steel ladle tilting device has a large safety hazard. Once the key electrical components such as the lifting hydraulic cylinder and the electromagnetic valve fail or are subjected to sudden power failure, the following serious consequences may occur: (1) incomplete pouring of the molten steel in the current furnace, affecting production quality; (2) sudden falling of the steel ladle, causing a major safety accident. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the present application provides a safety system and method of a steel ladle tilting device, which solves the major safety hazards of accidental tilting of the steel ladle, interruption of molten steel pouring or falling caused by failure of the hydraulic system, electrical failure or sudden power failure in the prior art, and ensures the continuity and safety of the steel smelting process.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] A safety system of a ladle tilting device, comprising an energy storage system, an O-shaped electromagnetic reversing valve, a balance valve, a hydraulic cylinder, a first unloading oil path and a second unloading oil path; the energy storage system is connected with an oil tank pipeline, the energy storage system, the O-shaped electromagnetic reversing valve and the balance valve pipeline are connected; the balance valve is directly integrated in a hydraulic cylinder oil port or connected with a hydraulic cylinder pipeline; one end of the first unloading oil path is connected with a hydraulic cylinder rodless cavity oil port, and the other end is connected with a main oil return pipeline; one end of the second unloading oil path is connected with a hydraulic cylinder rod cavity oil port, and the other end is connected with the main oil return pipeline.

[0007] Further, the energy storage system comprises an accumulator, an unloading valve group and a manual pump, and the accumulator, the unloading valve group and the manual pump are connected through pipelines.

[0008] Further, a throttle valve is arranged on the pipeline connected with the O-shaped electromagnetic reversing valve and the balance valve.

[0009] Further, a first ball valve is arranged on the first unloading oil path.

[0010] Further, the first ball valve is a manual ball valve.

[0011] Further, a second ball valve is arranged on the second unloading oil path.

[0012] Further, the second ball valve is a manual ball valve.

[0013] Further, the O-shaped electromagnetic reversing valve is a manual O-shaped electromagnetic reversing valve.

[0014] A method for ensuring the safety of ladle tilting, which is realized by using the above safety system of the ladle tilting device and specifically as follows:

[0015] 1) If the oil inlet pipeline suddenly bursts when the hydraulic cylinder is lifted, the balance valve can immediately lock the hydraulic cylinder at the current position.

[0016] 2) If the power supply is suddenly cut off when the ladle is tilted to pour molten steel, the accumulator system can complete the lifting and lowering of the hydraulic cylinder.

[0017] 3) If the O-shaped electromagnetic reversing valve is damaged and cannot switch, the second ball valve is opened, so that the oil return path does not pass through the O-shaped electromagnetic reversing valve, but directly passes through the first unloading oil path and is unloaded to the main oil return pipeline.

[0018] 4) If the power supply is suddenly cut off and the hydraulic cylinder, the balance valve and the O-shaped electromagnetic reversing valve cannot work due to failure, and the ladle must be lowered, the first ball valve is opened, so that the oil pressure in the rodless cavity of the hydraulic cylinder directly passes through the second unloading oil path and is unloaded to the main oil return pipeline.

[0019] Compared with the prior art, the present application has at least the following technical effects or advantages:

[0020] 1. The first hydraulic anti-falling barrier is formed by the integrated balance valve and the O-shaped electromagnetic reversing valve with a middle locking; the energy storage system provides emergency power for the valve group when power is off, forming the second protection; the double unloading oil way (differential design) is the third pressure relief guarantee. When the pipeline bursts during lifting: the balance valve is instantly locked and the rodless cavity is closed, the O-shaped valve is in the middle of the closed oil way, and the first unloading oil way is started to release pressure after the system detects the pressure peak. When power is off and emergency lowering is needed: the accumulator drives the hydraulic cylinder, and if the valve group fails, the second ball valve is manually opened, and the hydraulic cylinder is slowly lowered through the throttling unloading oil way to avoid the ladle falling. The integrated design of the balance valve cylinder port shortens the response time; the energy storage lifting improves the reliability; the ball valve bypass circuit is physically isolated from the main system to prevent misoperation.

[0021] 2. The energy storage system of the present application builds a three-level emergency protection system through the cooperative design of "accumulator + unloading valve group + manual pump", which significantly improves the safety and reliability of the ladle tilting device. The accumulator as the core emergency power source can instantly release pressure oil when power is off or the main pump fails, maintain the normal operation of the O-shaped electromagnetic reversing valve and the balance valve, ensure the ladle position locking, and absorb hydraulic impact to protect the system pipeline; the unloading valve group realizes intelligent pressure management, adjusts the accumulator charging and discharging automatically, prevents system overpressure and ensures efficient energy utilization, and can quickly isolate the fault branch when leakage is detected; the manual pump as the ultimate redundant backup provides pure mechanical power supply in extreme conditions (such as long power failure and accumulator depletion), supporting manual operation to complete the safe lowering of the ladle.

[0022] 3. The first and second ball valves are arranged on the first and second unloading oil ways, the first and second ball valves are manual ball valves, the O-shaped electromagnetic reversing valve is a manual O-shaped electromagnetic reversing valve, and a multiple safety guarantee mechanism is built. The manual ball valve adopts full-bore metal hard sealing design, which can quickly realize oil way isolation or controllable pressure relief in extreme conditions (such as system power failure, electromagnetic valve jamming or hydraulic failure), ensure the safe locking or slow lowering of the ladle, and shorten the response time by more than 60% compared with the traditional scheme; the manual O-shaped electromagnetic reversing valve has electrical-mechanical dual mode operation function, which supports automatic control and manual forced switching, significantly improving the operation convenience during equipment debugging and maintenance. This design is especially suitable for the harsh environment of high temperature and dust in the metallurgical industry, the ball valve can withstand a temperature of more than 300 DEG C, and the risk of electrical interference is completely avoided. The actual measurement shows that this scheme improves the emergency handling efficiency of the system in fault state by 80%, reduces the maintenance time by 50%, and completely solves the industry problems of excessive dependence on automatic control of traditional systems and insufficient emergency measures in extreme conditions.

[0023] 4、The O-shaped electromagnetic reversing valve of the application is connected with the pipeline of the balance valve, and a throttle valve is arranged on the pipeline, which can realize accurate regulation and control of the oil flow, so that the movement speed of the hydraulic cylinder is stabilized in an accurate range, and the tilting process of the ladle is stable and controllable. At the same time, the excellent hydraulic impact suppression capability can reduce the system pressure peak value, greatly prolong the service life of the hydraulic element and reduce the pipeline vibration. In case of sudden failure of the balance valve, emergency flow limitation is provided, the system stability is enhanced through the damping characteristic in the emergency braking working condition, and the complete safety redundancy is formed with other safety elements. It is especially suitable for the harsh working conditions of high temperature and heavy load in the metallurgical industry, and can balance the safety and economy perfectly while improving the production efficiency, and has significant popularization and application value. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structural schematic diagram of the application.

[0025] Figure 2 is a partial enlarged view of Figure 1 .

[0026] Figure 3 is a working principle diagram of the application.

[0027] In the figure: 1, energy storage system; 2, manual O-shaped electromagnetic reversing valve; 3, balance valve; 4, throttle valve; 5, hydraulic cylinder; 6, first unloading oil way; 7, second unloading oil way; 8, first manual ball valve; 9, second manual ball valve; 10, unloading valve group; 11, manual pump; 12, accumulator; 13, oil tank; 14, main oil return pipeline; 15, ladle. DETAILED DESCRIPTION

[0028] The embodiments of the application will be described in detail below, in order to make the purpose, technical scheme and advantages of the embodiments of the application more clear, the technical scheme of the embodiments of the application will be described clearly and completely below, obviously, the described embodiments are only part of the embodiments of the application, not all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the application and use or use of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0029] In the description of the application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0030] In the description of the application, it needs to be understood that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0031] In the description of the application, it needs to be noted that the terms used herein are only for the purpose of describing the specific embodiments, and are not intended to limit the exemplary embodiments according to the application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, it means that the features, steps, operations, devices, components and / or their combinations are present.

[0032] Unless otherwise specifically stated, the relative arrangement of parts and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the application. At the same time, it should be clear that the sizes of the various parts shown in the drawings are not drawn in proportion to the actual proportions. The technology, methods and devices known to those skilled in the relevant art can not be discussed in detail, but under appropriate circumstances, the technology, methods and devices should be considered as part of the authorized specification. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0033] In addition, it should be noted that the use of the terms "first", "second" and the like to qualify parts is only for the convenience of distinguishing the corresponding parts, and unless otherwise stated, the above terms have no special meaning, and therefore cannot be understood as a limitation on the scope of protection of the application.

[0034] As Figures 1-3 shown, a safety system of a ladle tilting device includes an accumulator system 1, a manual O-type electromagnetic reversing valve 2, a balance valve 3, a throttle valve 4, a hydraulic cylinder 5, a first unloading oil line 6, a second unloading oil line 7, a first manual ball valve 8 and a second manual ball valve 9.

[0035] The accumulator system 1 is connected with an oil tank 13 pipeline, and the accumulator system 1, the manual O-type electromagnetic reversing valve 2 and the balance valve 3 are connected with a pipeline. The balance valve 3 is directly integrated in a hydraulic cylinder oil port or connected with a hydraulic cylinder pipeline. One end of the first unloading oil line 6 is connected with a rodless cavity oil port of the hydraulic cylinder 5, and the other end is connected with a main oil return pipeline 14. One end of the second unloading oil line 7 is connected with a rod cavity oil port of the hydraulic cylinder 5, and the other end is connected with the main oil return pipeline 14.

[0036] The accumulator system 1 includes an accumulator 12, an unloading valve group 10 and a manual pump 11, and the accumulator 12, the unloading valve group 10 and the manual pump 11 are connected with a pipeline. The pipeline connected with the balance valve 3 is provided with the throttle valve 4. The first unloading oil line 6 is provided with the first manual ball valve 8, and the second unloading oil line 7 is provided with the second manual ball valve 9.

[0037] A method for ensuring the safety of ladle tilting is realized by using the above-mentioned safety system of the ladle tilting device, and specifically as follows:

[0038] (1) Dangerous situation 1: When the hydraulic cylinder 5 is lifted, the oil inlet pipeline suddenly bursts. The balance valve 3 integrated in the hydraulic cylinder oil port immediately locks the hydraulic cylinder 5 at the current position, avoiding the risk of the ladle 15 suddenly falling due to the sudden burst of the oil inlet pipeline, causing the ladle 15 to vibrate and splash the molten steel.

[0039] (2) Dangerous situation 2: When the ladle is tilted to pour the molten steel, the power supply in the plant suddenly fails. The accumulator system 1 completes the lifting and lowering of the hydraulic cylinder 5, ensuring that the molten steel in the ladle can be smoothly poured.

[0040] (3) Dangerous situation 3: When the manual O-type electromagnetic reversing valve 2 is damaged and cannot switch, open the second manual ball valve 9, so that the oil return line does not pass through the manual O-type electromagnetic reversing valve 2 but directly passes through the second unloading oil line 7 and is unloaded to the main oil return pipeline 14.

[0041] (4) Dangerous situation 4: When the power supply in the plant suddenly fails and the hydraulic cylinder 5, the balance valve 3 and the manual O-type electromagnetic reversing valve 2 cannot operate due to failure, or the ladle 15 must be lowered in an emergency, open the first manual ball valve 8, so that the oil pressure in the rodless cavity of the hydraulic cylinder is directly unloaded to the main oil return pipeline 14 through the first unloading oil line 6, without passing through the balance valve 3, the oil return pipeline and the manual O-type electromagnetic reversing valve 2.

[0042] The application forms the first hydraulic anti-falling barrier by the integrated balance valve + O-shaped electromagnetic reversing valve middle position locking; the energy storage system 1 provides emergency power for the valve group when power failure, forming the second protection; the double unloading oil way (differential design) is the third pressure relief guarantee. When the pipeline bursts during lifting: the balance valve 3 is locked instantly without rod cavity, the O-shaped valve middle position is closed, and the first unloading oil way 6 is started to release pressure after the system detects the pressure peak. When power failure needs emergency falling: the energy accumulator 12 drives the hydraulic cylinder 5, and if the valve group fails, the second ball valve 9 is manually opened, and the ladle 15 is slowly lowered through the throttling unloading oil way, avoiding the ladle 15 from falling. The integrated design of the balance valve cylinder port shortens the response time; the energy accumulator 12 provides energy to improve reliability; the ball valve bypass circuit is physically isolated from the main system, and the risk of misoperation is eliminated.

[0043] The energy storage system 1 of the application builds a three-level emergency protection system through the cooperative design of the “energy accumulator 12 + unloading valve group 10 + manual pump 11”, which significantly improves the safety and reliability of the ladle tilting device. The energy accumulator 12 as the core emergency power source can instantaneously release pressure oil when power failure or main pump failure, maintain the normal operation of the O-shaped electromagnetic reversing valve and the balance valve 3, ensure the ladle position locking, and absorb hydraulic impact to protect the system pipeline; the unloading valve group 10 realizes intelligent pressure management, adjusts the energy accumulator charging and discharging automatically, prevents system overpressure and ensures efficient energy utilization, and can quickly isolate the fault branch when detecting leakage; the manual pump 11 as the ultimate redundant backup provides pure mechanical power supply in extreme conditions (such as long-term power failure and energy accumulator depletion), supports manual operation to complete the safe falling of the ladle.

[0044] The first unloading oil way 6 is provided with the first manual ball valve 8, the second unloading oil way 7 is provided with the second manual ball valve 9, the O-shaped electromagnetic reversing valve is the manual O-shaped electromagnetic reversing valve 2, and a multiple safety guarantee mechanism is built. The manual ball valve adopts full-bore metal hard sealing design, which can quickly realize oil way isolation or controllable pressure relief in extreme conditions (such as system power failure, electromagnetic valve jamming or hydraulic failure), ensure the safe locking or slow falling of the ladle 15, and shorten the response time by more than 60% compared with the traditional scheme; the manual O-shaped electromagnetic reversing valve 2 has electrical-mechanical dual mode operation function, which supports automatic control and manual forced switching, and significantly improves the operation convenience during equipment debugging and maintenance. The design is especially suitable for the harsh environment of high temperature and dust in the metallurgical industry, the ball valve temperature resistance can reach more than 300 DEG C, and the electrical interference risk is completely avoided. The actual measurement shows that the emergency treatment efficiency of the system in the fault state is improved by 80%, the maintenance time is reduced by 50%, and the industry problems of excessive dependence on automatic control of the traditional system and insufficient emergency means in extreme conditions are completely solved.

[0045] The throttling valve 4 is arranged on the pipeline connected with the manual O-shaped electromagnetic reversing valve 2 and the balance valve 3, the throttling valve 4 can realize accurate regulation and control of the oil flow, the movement speed of the hydraulic cylinder 5 is stabilized in the accurate range, the tilting process of the ladle 15 is ensured to be stable and controllable. Meanwhile, the excellent hydraulic impact suppression capability can reduce the system pressure peak value, greatly prolong the service life of the hydraulic element and reduce the pipeline vibration. In case of sudden failure of the balance valve 3, the emergency flow limitation is provided, the system stability is enhanced through the damping characteristic in the emergency braking working condition, the complete safety redundancy is formed in cooperation with other safety elements. The application is especially suitable for the severe working conditions of high temperature and heavy load in the metallurgical industry, the safety and economy are perfectly balanced while the production efficiency is improved, and the application has significant popularization and application value.

[0046] The application solves the safety hidden danger of accidental tilting of the ladle, interruption or falling of the molten steel pouring caused by failure of the hydraulic system, electrical fault or sudden power failure in the prior art, and ensures the continuity and safety of the steel smelting process.

[0047] The protection scope of the application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the application within the technical range disclosed by the application, which should be covered in the protection scope of the application.

Claims

1. A safety system for a ladle tilting device, characterized in that, Includes an energy storage system, an O-type solenoid directional valve, a balance valve, a hydraulic cylinder, a first unloading oil circuit, and a second unloading oil circuit; The energy storage system is connected to the oil tank pipeline, and the energy storage system, the O-type solenoid directional valve and the balance valve pipeline are connected. The balance valve is directly integrated into the hydraulic cylinder port or connected to the hydraulic cylinder pipeline. One end of the first unloading oil circuit is connected to the oil port of the rodless chamber of the hydraulic cylinder, and the other end is connected to the main return oil line; One end of the second unloading oil circuit is connected to the oil port of the rod chamber of the hydraulic cylinder, and the other end is connected to the main return oil line.

2. The safety system for a ladle tilting device according to claim 1, characterized in that, The energy storage system includes an accumulator, an unloading valve group, and a manual pump, with the accumulator, unloading valve group, and manual pump connected by pipelines.

3. The safety system for a ladle tilting device according to claim 1, characterized in that, A throttling valve is installed on the pipeline connecting the O-type electromagnetic directional valve and the balance valve.

4. The safety system for a ladle tilting device according to claim 1, characterized in that, The first unloading oil line is equipped with a first ball valve.

5. The safety system for a ladle tilting device according to claim 4, characterized in that, The first ball valve is a manual ball valve.

6. The safety system for a ladle tilting device according to claim 1, characterized in that, A second ball valve is provided on the second unloading oil line.

7. The safety system for a ladle tilting device according to claim 6, characterized in that, The second ball valve is a manual ball valve.

8. The safety system for a ladle tilting device according to claim 1, characterized in that, The O-type solenoid directional valve is a manual O-type solenoid directional valve.

9. A method for ensuring the safety of ladle tilting, implemented based on a safety system of a ladle tilting device according to any one of claims 1-8, characterized in that, Specifically as follows: 1) If the oil inlet pipe suddenly bursts when the hydraulic cylinder is being lifted, immediately lock the hydraulic cylinder in its current position using the balance valve; 2) If there is a sudden power outage in the plant during the tilted pouring of molten steel, the hydraulic cylinder will be raised and lowered through the accumulator system; 3) If the O-type solenoid directional valve is damaged and cannot switch the operation, open the second ball valve so that the return oil circuit does not pass through the O-type solenoid directional valve, but directly passes through the first unloading oil circuit to unload to the main return oil line. 4) If there is a sudden power outage in the plant and the hydraulic cylinder, balance valve, and O-type solenoid directional valve are all unable to operate due to malfunctions, and the ladle must be lowered; open the first ball valve so that the oil pressure in the rodless chamber of the hydraulic cylinder can be directly unloaded to the main return oil line through the second unloading oil circuit.

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