Sliding nozzle hydraulic control system and method

Abstract

The invention discloses a sliding nozzle hydraulic control system and method.The method comprises the steps that the system comprises an oil inlet pipeline, an oil return pipeline, a working energy storage device, an accident energy storage device, an accident closing device, a high-speed switching device, a low-speed switching device and a pressure releasing device, and the oil inlet pipeline is used for providing hydraulic oil for the system; the oil return pipeline is used for recovering hydraulic oil in the system; the working energy storage device is used for absorbing hydraulic impact and hydraulic fluctuation in the system; the accident energy storage device is used for storing hydraulic energy and providing the hydraulic energy for the hydraulic cylinder which urgently closes the sliding nozzle; the accident closing device is used for urgently closing the hydraulic cylinder, and the quick switching device is used for controlling quick opening and quick closing of the hydraulic cylinder. The low-speed switch device is used for controlling low-speed opening and low-speed closing of the hydraulic cylinder; and the pressure release device is used for releasing pressure in the hydraulic cylinder. Through the technical scheme provided by the invention, the safety of hydraulic control of the sliding gate nozzle can be improved.

Description

Technical Field

[0001] This application belongs to the technical field of sliding gate hydraulic control, and particularly relates to a sliding gate hydraulic control system and method. Background Art

[0002] The ladle sliding gate is an important device in the continuous casting production process, which can be used to control the flow of molten steel during continuous casting production, and can also prevent molten steel from splashing and protect the safety of workers; currently, in industrial production, the opening and closing of the sliding gate are mainly controlled by a hydraulic system. In the prior art, the hydraulic system of the sliding gate has problems such as inability to control the opening and closing of the sliding gate variably, lack of a pressure relief channel and an accident control device, and there are certain safety risks. Therefore, how to improve the safety of the sliding gate hydraulic control system is a technical problem to be solved urgently. Summary of the Invention

[0003] Embodiments of the present application provide a sliding gate hydraulic control system and method, which can at least improve the safety of sliding gate hydraulic control to a certain extent.

[0004] Other features and advantages of the present application will become apparent through the following detailed description, or be learned in part through the practice of the present application.

[0005] According to a first aspect of the embodiments of the present application, a sliding gate hydraulic control system is provided, characterized in that the system includes an oil inlet pipeline, an oil return pipeline, a working energy storage device, an accident energy storage device, an accident closing device, a quick switch device, a slow switch device and a pressure release device. Among them, the oil inlet pipeline is connected to the oil outlet of the oil depot of the system for providing hydraulic oil for the system; the oil return pipeline is connected to the oil return port of the oil depot of the system for recovering the hydraulic oil in the system; the working energy storage device is connected to the oil inlet pipeline and the oil return pipeline through pipelines for absorbing hydraulic shock and hydraulic fluctuation inside the system; the accident energy storage device is connected to the oil inlet pipeline and the oil return pipeline through pipelines for storing hydraulic energy and providing hydraulic energy for the hydraulic cylinder for urgently closing the sliding gate; the accident closing device is connected to the accident energy storage device, the oil inlet pipeline, the oil return pipeline and the hydraulic cylinder through pipelines for urgently closing the hydraulic cylinder; the quick switch device is connected to the oil inlet pipeline, the oil return pipeline and the hydraulic cylinder through pipelines for controlling the quick opening and quick closing of the hydraulic cylinder; the slow switch device is connected to the oil inlet pipeline, the oil return pipeline and the hydraulic cylinder through pipelines for controlling the slow opening and slow closing of the hydraulic cylinder; the pressure release device is connected to the oil inlet pipeline, the oil return pipeline and the hydraulic cylinder through pipelines for releasing the pressure inside the hydraulic cylinder.

[0006] In some embodiments of the present application, based on the foregoing solution, the quick-switching device includes: a quick three-position four-way valve, connected to the oil inlet pipeline and the oil return pipeline, controlling the flow direction of the hydraulic oil by switching the spool to control the opening and closing of the hydraulic cylinder; a quick first pilot-operated check valve, connected to the quick three-position four-way valve through a pipeline, for stabilizing the opening degree of the hydraulic cylinder when it is opened; a quick second pilot-operated check valve, connected to the quick three-position four-way valve through a pipeline, for stabilizing the opening degree of the hydraulic cylinder when it is opened; a quick first one-way throttle valve, connected to the quick first pilot-operated check valve and the hydraulic cylinder through a pipeline, for controlling the flow rate of the hydraulic oil; a quick second one-way throttle valve, connected to the quick second pilot-operated check valve and the hydraulic cylinder through a pipeline, for controlling the flow rate of the hydraulic oil.

[0007] In some embodiments of the present application, based on the foregoing solution, the slow-switching device includes: a slow three-position four-way valve, connected to the oil inlet pipeline and the oil return pipeline, controlling the flow direction of the hydraulic oil by switching the spool to control the opening and closing of the hydraulic cylinder; a slow first pilot-operated check valve, connected to the slow three-position four-way valve through a pipeline, for stabilizing the opening degree of the hydraulic cylinder when it is opened; a slow second pilot-operated check valve, connected to the slow three-position four-way valve through a pipeline, for stabilizing the opening degree of the hydraulic cylinder when it is opened; a slow first one-way throttle valve, connected to the slow first pilot-operated check valve and the hydraulic cylinder through a pipeline, for controlling the flow rate of the hydraulic oil; a slow second one-way throttle valve, connected to the slow second pilot-operated check valve and the hydraulic cylinder through a pipeline, for controlling the flow rate of the hydraulic oil.

[0008] In some embodiments of the present application, based on the foregoing solution, the emergency shutdown device includes: an emergency two-position four-way valve, connected to the oil inlet pipeline through a pipeline, controlling the flow direction of the hydraulic oil by switching the spool to control the opening and closing of the hydraulic cylinder; an emergency check valve, connected to the emergency two-position four-way valve and the hydraulic cylinder through a pipeline, for controlling the flow direction of the hydraulic oil; an emergency pilot-operated check valve, connected to the oil return pipeline and the hydraulic cylinder through a pipeline, for controlling the flow direction of the hydraulic oil.

[0009] In some embodiments of the present application, based on the foregoing solution, the pressure relief device includes: a pressure relief two-position four-way valve, connected to the oil return pipeline, controlling the flow direction of the hydraulic oil by switching the spool to control the pressure relief in the hydraulic cylinder; a first throttle plug, connected to the rodless cavity of the hydraulic cylinder and the pressure relief two-position four-way valve through a pipeline, for controlling the flow rate of the hydraulic oil; a second throttle plug, connected to the rod chamber of the hydraulic cylinder and the pressure relief two-position four-way valve through a pipeline, for controlling the flow rate of the hydraulic oil.

[0010] In some embodiments of the present application, based on the foregoing solution, the working energy storage device includes: a bladder-type working energy accumulator, connected to the oil inlet pipeline through a pipeline, for absorbing hydraulic shocks and hydraulic fluctuations inside the system; a working energy storage pressure gauge, connected to the bladder-type working energy accumulator through a pipeline, for detecting the pressure in the bladder-type working energy accumulator; a working energy storage relay, connected to the bladder-type working energy accumulator through a pipeline, for transmitting the pressure data in the bladder-type working energy accumulator to a remote terminal; a working energy accumulator safety valve, connected to the bladder-type working energy accumulator through a pipeline, for controlling the pressure in the bladder-type working energy accumulator to remain stable.

[0011] In some embodiments of the present application, based on the foregoing solution, the accident energy storage device includes: a bladder-type accident energy accumulator, connected to the oil inlet pipeline through a pipeline, for absorbing hydraulic shocks and hydraulic fluctuations inside the system; an accident energy storage pressure gauge, connected to the bladder-type accident energy accumulator through a pipeline, for detecting the pressure in the bladder-type accident energy accumulator; an accident energy storage relay, connected to the bladder-type accident energy accumulator through a pipeline, for transmitting the pressure data in the bladder-type accident energy accumulator to a remote terminal; an accident energy accumulator safety valve, connected to the bladder-type accident energy accumulator through a pipeline, for controlling the pressure in the bladder-type accident energy accumulator to remain stable.

[0012] According to the second aspect of the embodiments of the present application, a sliding gate hydraulic control method is provided, characterized in that the method is applied to the system described in any one of the above first aspects, and the method includes: when the sliding gate is opened, control one side electromagnetic coil of the slow three-way four-way valve to be energized, adjust the spool position of the slow three-way four-way valve, so that the rodless cavity of the sliding gate hydraulic cylinder is connected to the oil return pipeline through the slow first one-way throttle valve and the slow first pilot-operated one-way valve, and the rod cavity of the hydraulic cylinder is connected to the oil supply pipeline through the slow second one-way throttle valve and the slow second pilot-operated one-way valve, and the sliding gate is opened slowly for a first preset duration; control one side electromagnetic coil of the fast three-way four-way valve to be energized, adjust the spool position of the fast three-way four-way valve, so that the rodless cavity of the sliding gate hydraulic cylinder is connected to the oil return pipeline through the fast first one-way throttle valve and the fast first pilot-operated one-way valve, and the rod cavity of the hydraulic cylinder is connected to the oil supply pipeline through the fast second one-way throttle valve and the fast second pilot-operated one-way valve, and the sliding gate is opened quickly until the sliding gate is opened to a preset opening degree, and then control the one side electromagnetic coil of the slow three-way four-way valve and the one side electromagnetic coil of the fast three-way four-way valve to be de-energized; when the sliding gate is closed, control the other side electromagnetic coil of the slow three-way four-way valve to be energized, adjust the spool position of the slow three-way four-way valve, so that the rodless cavity of the sliding gate hydraulic cylinder is connected to the oil supply pipeline through the slow first one-way throttle valve and the slow first pilot-operated one-way valve, and the rod cavity of the hydraulic cylinder is connected to the oil return pipeline through the slow second one-way throttle valve and the slow second pilot-operated one-way valve, and the sliding gate is closed slowly for a second preset duration; control the other side electromagnetic coil of the fast three-way four-way valve to be energized, adjust the spool position of the fast three-way four-way valve, so that the rodless cavity of the sliding gate hydraulic cylinder is connected to the oil supply pipeline through the fast first one-way throttle valve and the fast first pilot-operated one-way valve, and the rod cavity of the hydraulic cylinder is connected to the oil return pipeline through the fast second one-way throttle valve and the fast second pilot-operated one-way valve, and the sliding gate is closed quickly until the sliding gate is completely closed, and then control the other side electromagnetic coil of the slow three-way four-way valve and the other side electromagnetic coil of the fast three-way four-way valve to be de-energized.

[0013] In some embodiments of the present application, based on the foregoing solution, the method further includes: when the sliding gate is emergently closed, control the accident two-way four-way valve to be de-energized to adjust the spool position of the accident two-way four-way valve, so that the rodless cavity of the hydraulic cylinder is connected to the oil supply pipeline through the two-way four-way valve and the accident one-way valve, and the rod cavity of the hydraulic rod is connected to the oil return pipeline through the accident pilot-operated one-way valve, and the sliding gate is emergently closed.

[0014] In some embodiments of the present application, based on the foregoing solution, the method further includes: when the hydraulic cylinder of the sliding gate releases pressure, controlling the pressure relief double-position four-way valve to be powered off to adjust the spool position of the pressure relief double-position four-way valve, so that both the rodless cavity and the rod cavity of the hydraulic cylinder are communicated with the oil return pipeline, and releasing the pressure of the hydraulic cylinder.

[0015] Based on the technical solution proposed in the present application, first, by providing an accident energy storage device and an accident shutdown device, the system can timely close the hydraulic cylinder of the sliding gate in case of an accident to prevent molten steel from flowing out and causing damage to equipment and nearby operators, thereby improving the safety of the hydraulic system during operation; second, by providing a working energy storage device, the hydraulic fluctuations and hydraulic shocks in the hydraulic system can be more effectively absorbed, thereby improving the internal stability and safety of the hydraulic system and reducing the probability of accidents. Then, by providing a quick switch device and a slow switch device, the quick switch and slow switch of the hydraulic cylinder can be realized, improving the control accuracy of the sliding gate. Finally, by controlling the speed change of the switch of the hydraulic cylinder, the hydraulic shock and hydraulic fluctuation generated during the switching process can also be reduced, further improving the safety of the hydraulic control system; in addition, the hydraulic system is also provided with a pressure release device, which can release the pressure inside the hydraulic cylinder, so that the installation and disassembly of the hydraulic cylinder are more convenient, and the safety of the hydraulic system during operation is further improved.

[0016] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present application and used together with the specification to explain the principles of the present application. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. In the drawings:

[0018] Figure 1 Shows a schematic diagram of a sliding gate hydraulic control system in an embodiment of the present application;

[0019] Figure 2 Shows a flowchart of a sliding gate hydraulic control method in an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0021] In addition, the described features, structures or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, many specific details are provided to give a full understanding of the embodiments of the present application. However, those skilled in the art will realize that the technical solutions of the present application can be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, well-known methods, devices, implementations or operations are not shown or described in detail to avoid obscuring various aspects of the present application.

[0022] The block diagrams shown in the drawings are only functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software form, or implemented in one or more hardware modules or integrated circuits, or implemented in different networks and / or processor devices and / or microcontroller devices.

[0023] The flowcharts shown in the drawings are only illustrative and do not necessarily include all the content and operations / steps, nor do they necessarily need to be executed in the described order. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined. Therefore, the actual execution order may change according to the actual situation.

[0024] It should be noted that the term "a plurality" mentioned herein refers to two or more. "And / or" describes the association relationship of associated objects and indicates that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0025] It should also be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and do not necessarily need to be used to describe a specific order or sequence. It should be understood that the objects used in this way can be interchanged under appropriate circumstances so that the embodiments of the present application described here can be implemented in an order other than those shown or described.

[0026] To enable those skilled in the art to better understand the present application, first, a brief description of the sliding gate hydraulic control proposed in the present application will be given.

[0027] The tundish slide gate is an important device in the continuous casting production process. It can be used to control the flow of molten steel during continuous casting production and prevent the splashing of molten steel to protect the safety of workers. At present, in industrial production, the opening and closing of the slide gate are mainly controlled by a hydraulic system. However, in the prior art, the hydraulic system of the slide gate has problems such as inability to control the opening and closing of the slide gate variably, lack of a pressure relief channel and an accident control device, and there are certain safety risks. Therefore, how to improve the safety of the slide gate hydraulic control system is a technical problem to be solved urgently. Based on this, the inventors of this application have proposed a slide gate hydraulic control system to improve the safety of the slide gate hydraulic control system.

[0028] Next, in combination with Figure 1 , a slide gate hydraulic control system proposed in this application will be elaborated in detail.

[0029] Refer to Figure 1 , which shows a schematic diagram of the slide gate hydraulic control system in an embodiment of this application. As Figure 1 shown, the slide gate hydraulic control system can at least include an oil inlet pipeline P, an oil return pipeline T, a working energy storage device A, an accident energy storage device B, an accident closing device C, a quick switch device D, a slow switch device E, and a pressure release device F. Among them, the oil inlet pipeline P is connected to the oil outlet 11 of the oil depot of the system and can be used to provide hydraulic oil for the system; the oil return pipeline T is connected to the oil return port 21 of the oil depot of the system and can be used to recover the hydraulic oil in the system; the working energy storage device A is connected to the oil inlet pipeline P and the oil return pipeline T through pipelines and can be used to absorb the hydraulic shock and hydraulic fluctuation inside the system; the accident energy storage device B is connected to the oil inlet pipeline P and the oil return pipeline T through pipelines and can be used to store hydraulic energy and provide hydraulic energy for the hydraulic cylinder 221 to urgently close the slide gate; the accident closing device C is connected to the accident energy storage device B, the oil inlet pipeline P, the oil return pipeline T, and the hydraulic cylinder 221 through pipelines and can be used to urgently close the hydraulic cylinder 221. The quick switch device D is connected to the oil inlet pipeline P, the oil return pipeline T, and the hydraulic cylinder 221 through pipelines and can be used to control the quick opening and quick closing of the hydraulic cylinder 221; the slow switch device E is connected to the oil inlet pipeline P, the oil return pipeline T, and the hydraulic cylinder 221 through pipelines and can be used to control the slow opening and slow closing of the hydraulic cylinder 221; the pressure release device F is connected to the oil inlet pipeline P, the oil return pipeline T, and the hydraulic cylinder 221 through pipelines and can be used to release the pressure in the hydraulic cylinder 221.

[0030] In this application, by setting the accident energy storage device B and the accident shutdown device C, when an accident occurs, the hydraulic cylinder 221 of the sliding nozzle can be timely shut down to prevent molten steel from flowing out and causing damage to equipment and nearby operators, thereby improving the safety of the hydraulic system during operation. By setting the working energy storage device A, the hydraulic fluctuations and hydraulic shocks in the hydraulic system can be more effectively absorbed, thereby improving the internal stability and safety of the hydraulic system and reducing the probability of accidents.

[0031] In this application, by setting the quick switch device D and the slow switch device E, the quick switch and slow switch of the hydraulic cylinder can be realized, improving the control accuracy of the sliding nozzle. At the same time, by performing variable-speed control on the switch of the hydraulic cylinder, the hydraulic shocks and hydraulic fluctuations generated during the switching process can also be reduced, further improving the safety of the hydraulic control system. In addition, the hydraulic system is also provided with a pressure release device F, which can release the pressure inside the hydraulic cylinder, enabling the installation and disassembly of the hydraulic cylinder to be more convenient and further improving the safety of the hydraulic system during operation.

[0032] Please continue to refer to Figure 1 As shown, the working energy storage device A can at least include a bladder-type working accumulator 51, a working energy storage pressure gauge 81, a working energy storage relay 91, and a working energy storage safety valve 101. Among them, the bladder-type working accumulator 51 is connected to the oil inlet pipeline P through a pipeline and can be used to absorb the hydraulic shocks and hydraulic fluctuations inside the system. A first safety ball valve 41 is provided on the pipeline and can be used to control the flow rate of hydraulic oil entering the working accumulator. The working energy storage pressure gauge 81 is connected to the bladder-type working accumulator through a pipeline and can be used to detect the pressure in the bladder-type working accumulator. A working energy storage first measuring point 61 and a working energy storage pressure measuring flexible line 71 are also provided on the pipeline and can be used to measure the pressure and feedback the pressure to the working energy storage pressure gauge 81. The working energy storage relay 91 is connected to the bladder-type working accumulator through a pipeline and can be used to transmit the pressure data in the bladder-type working accumulator 51 to a remote terminal. A working energy storage second measuring point 62 is also provided on the pipeline and can be used to measure the pressure data. The working accumulator safety valve 101 is connected to the bladder-type working accumulator 51 through a pipeline and can be used to control the pressure in the bladder-type working accumulator to remain stable.

[0033] In this application, a layer of film is provided inside the working accumulator 51, and a certain volume of gas can be filled. When the hydraulic oil with a relatively high pressure passes through the first safety ball valve 41 from the oil inlet pipeline P and enters the inside of the working accumulator 51, the relatively high-pressure hydraulic oil can be buffered by the gas, thereby reducing the damage of the high-pressure and high-impact hydraulic oil to the hydraulic system and further improving the safety and stability of the hydraulic system.

[0034] In this application, by providing a working accumulator pressure gauge 81 and a working accumulator relay 91, on-site monitoring and remote monitoring of the pressure of the working accumulator 51 can be achieved; in addition, by providing a first measuring point 61 of the working accumulator and a second measuring point 62 of the working accumulator to monitor the pressure of the working accumulator 81 respectively, the accuracy of pressure detection can be improved to strengthen the control of the hydraulic system, thereby ensuring the safe and stable operation of the hydraulic system.

[0035] Please continue to refer to Figure 1 As shown, in this application, the accident energy storage device B can at least include a bladder-type accident accumulator 52, an accident accumulator pressure gauge 82, an accident accumulator relay 92, and an accident accumulator safety valve 102. Among them, the bladder-type accident accumulator 52 is connected to the oil inlet pipeline through a pipeline and is used to absorb the hydraulic shock and hydraulic fluctuation inside the system. And a second safety ball valve 42 is provided on the pipeline, which can be used to control the flow rate of the hydraulic oil entering the accident accumulator; the accident accumulator pressure gauge 82 is connected to the bladder-type accident accumulator 52 through a pipeline and is used to detect the pressure in the bladder-type accident accumulator 52. An accident accumulator first measuring point 63 and an accident accumulator pressure measuring flexible line 72 are also provided on the pipeline, which can be used to measure the pressure and feed back the pressure to the accident accumulator pressure gauge 82; the accident accumulator relay 92 is connected to the bladder-type accident accumulator through a pipeline and is used to transmit the pressure data in the bladder-type accident accumulator 52 to a remote terminal. An accident accumulator second measuring point 64 is also provided on the pipeline, which can be used to measure the pressure data; the accident accumulator safety valve 102 is connected to the bladder-type accident accumulator 52 through a pipeline and is used to control the pressure in the bladder-type accident accumulator 52 to remain stable.

[0036] In this application, the accident energy storage device A can be used to absorb the hydraulic shock and hydraulic fluctuation inside the system and store hydraulic energy. When the system operation is abnormal, it can be used to provide energy for the accident shutdown device C to close the hydraulic cylinder 221 to avoid the leakage of molten steel and improve the safety of system operation.

[0037] Please continue to refer to Figure 1As shown, the accident shutdown device C can at least include an accident two-position four-way valve 131, an accident one-way valve 151, and an accident pilot-operated one-way valve 141. Among them, the accident two-position four-way valve 131 is connected to the oil inlet pipeline P through a pipeline, and the flow direction of the hydraulic oil can be controlled by switching the valve core to control the opening and closing of the hydraulic cylinder; the accident one-way valve 151 is connected to the accident two-position four-way valve and the hydraulic cylinder through a pipeline and can be used to control the flow direction of the hydraulic oil; the accident pilot-operated one-way valve 141 is connected to the oil return pipeline and the hydraulic cylinder through a pipeline and can be used to control the flow direction of the hydraulic oil.

[0038] In this application, when the system is working normally, the power connection port a3 of the accident two-position four-way valve 131 is in the energized state. At this time, the flow path of the hydraulic oil is disconnected at the accident two-position four-way valve 131, that is, the P3 port and the A3 port are in a disconnected state, and the hydraulic oil will not pass through. When an accident occurs in the system, the power connection port a3 of the accident two-position four-way valve 131 is in the de-energized state, that is, as Figure 1 shown in the state, at this time, the P3 port and the A3 port are in a connected state, and the hydraulic oil will pass through the A3 port and the P3 port, flow into the rodless cavity of the hydraulic cylinder through the accident one-way valve 151, and the hydraulic oil in the rod cavity of the hydraulic cylinder will flow back to the oil return pipeline T through the accident pilot-operated one-way valve 141. At this time, the piston rod of the hydraulic cylinder will extend out of the hydraulic cylinder, that is, the hydraulic cylinder will gradually close, and then control the sliding water gap to close to avoid molten steel leakage after an accident, causing damage to equipment and operators.

[0039] Please continue to refer to Figure 1 As shown, the quick switch device D can at least include a quick three-position four-way valve 161, a quick first pilot-operated one-way valve 171, a quick second pilot-operated one-way valve 172, a quick first one-way throttle valve 181, and a quick second one-way throttle valve 182. Among them, the quick three-position four-way valve 161 is connected to the oil inlet pipeline P and the oil return pipeline T, and the flow direction of the hydraulic oil can be controlled by switching the valve core to control the opening and closing of the hydraulic cylinder 221; the quick first pilot-operated one-way valve 171 is connected to the quick three-position four-way valve 161 through a pipeline and can be used to stabilize the opening degree of the hydraulic cylinder 221 when it is opened; the quick second pilot-operated one-way valve 172 is connected to the quick three-position four-way valve 161 through a pipeline and can be used to stabilize the opening degree of the hydraulic cylinder 221 when it is opened; the quick first one-way throttle valve 181 is connected to the quick first pilot-operated one-way valve 171 and the hydraulic cylinder 221 through a pipeline and can be used to control the flow rate of the hydraulic oil; the quick second one-way throttle valve 182 is connected to the quick second pilot-operated one-way valve 172 and the hydraulic cylinder 221 through a pipeline and can be used to control the flow rate of the hydraulic oil.

[0040] Please continue to refer toFigure 1 As shown, the slow switch device E may at least include a slow three-position four-way valve 162, a slow first hydraulic check valve 173, a slow second hydraulic check valve 174, a slow first one-way throttle valve 183, and a slow second one-way throttle valve 184. Among them, the slow three-position four-way valve 162 is connected to the oil inlet pipeline P and the oil return pipeline T, and can control the flow direction of the hydraulic oil by switching the spool to control the opening and closing of the hydraulic cylinder 221; the slow first hydraulic check valve 173 is connected to the slow three-position four-way valve 162 through a pipeline and can be used to stabilize the opening degree of the hydraulic cylinder 221 when it is opened; the slow second hydraulic check valve 174 is connected to the slow three-position four-way valve 162 through a pipeline and can be used to stabilize the opening degree of the hydraulic cylinder 221 when it is opened; the slow first one-way throttle valve 183 is connected to the slow first hydraulic check valve 173 and the hydraulic cylinder 221 through a pipeline and can be used to control the flow rate of the hydraulic oil; the slow second one-way throttle valve 184 is connected to the slow second hydraulic check valve 174 and the hydraulic cylinder 221 through a pipeline and can be used to control the flow rate of the hydraulic oil.

[0041] In this application, the time for the fast switch device to control the opening and closing of the hydraulic cylinder may specifically be 3 seconds, 4 seconds, or 5 seconds. The time for the slow switch device to control the opening and closing of the hydraulic cylinder may specifically be 25 seconds, 30 seconds, or 20 seconds. This application does not make specific limitations on this.

[0042] In this application, by setting the fast switch device and the slow switch device, variable-speed control of the opening and closing of the hydraulic cylinder can be achieved. For example, during the process of controlling the opening and closing of the hydraulic cylinder, the slow switch device can be used first to control the opening and closing of the hydraulic cylinder at a slower speed. After a period of time, the fast switch device can be used to control the hydraulic cylinder to open and close at a faster speed. In this way, while ensuring the efficiency of the opening and closing of the hydraulic cylinder, the hydraulic shock and hydraulic fluctuation generated when the hydraulic cylinder is switched quickly can be reduced, and thus the stability of the operation of the hydraulic system can be improved; in addition, through the slow switch device, the precise control of the opening degree of the hydraulic cylinder can also be improved, making the opening degree of the hydraulic cylinder more in line with the process requirements, and then the flow rate of the molten steel flowing out of the sliding nozzle can be controlled more accurately, effectively improving the accuracy and stability of the system operation.

[0043] Continue to refer to Figure 1 ​, the pressure relief device F may at least include: a pressure relief two-position four-way valve 191, a first throttle plug 201, and a second throttle plug 201. Among them, the pressure relief two-position four-way valve 191 is connected to the oil return pipeline T, and the flow direction of the hydraulic oil can be controlled by switching the valve core to control the pressure relief in the hydraulic cylinder; the first throttle plug 201 is connected to the rodless cavity of the hydraulic cylinder 221 and the pressure relief two-position four-way valve 191 through a pipeline, and can be used to control the flow rate of the hydraulic oil; the second throttle plug 202 is connected to the rod cavity of the hydraulic cylinder 221 and the pressure relief two-position four-way valve 191 through a pipeline, and can be used to control the flow rate of the hydraulic oil.

[0044] In this application, by setting the pressure relief device, when it is necessary to install and disassemble the hydraulic cylinder, the pressure inside the hydraulic cylinder can be released, reducing the difficulty and danger of installation and disassembly, improving the safety of the system, and when the system pressure is too high, the pressure in the system can be released through the pressure relief device, thereby improving the stability of the system during operation.

[0045] Continue to refer to Figure 1 As shown, in this application, the hydraulic system may further include a rodless cavity measuring point 65 of the hydraulic cylinder and a rod cavity measuring point 66 of the hydraulic cylinder. Through the rodless cavity measuring point 65 of the hydraulic cylinder and the rod cavity measuring point 66 of the hydraulic cylinder, the pressure data of the rod cavity and the rodless cavity of the hydraulic cylinder can be obtained respectively, providing accurate data for controlling the hydraulic system, and through the pressure data, data support can also be provided for the subsequent control of the hydraulic system.

[0046] Next, in combination with Figure 2 , the sliding gate hydraulic control method proposed in this application will be elaborated in detail.

[0047] See Figure 2 , which shows a flowchart of the sliding gate hydraulic control method in an embodiment of this application. As Figure 1 shown, the sliding gate hydraulic control method may at least include the following steps 110 to step 140:

[0048] Step 110, when the sliding gate is opened, control one side of the electromagnetic coil of the slow three-position four-way valve to be energized, adjust the position of the valve core of the slow three-position four-way valve, so that the rodless cavity of the sliding gate hydraulic cylinder is connected to the oil return pipeline through the slow first one-way throttle valve and the slow first pilot-operated one-way valve, and the rod cavity of the hydraulic cylinder is connected to the oil inlet pipeline through the slow second one-way throttle valve and the slow second pilot-operated one-way valve, and the sliding gate is opened slowly for a first preset duration.

[0049] Step 120, energize one side electromagnetic coil of the quick three-position four-way valve, adjust the spool position of the quick three-position four-way valve, so that the rodless cavity of the sliding gate hydraulic cylinder communicates with the return oil pipeline through the quick first one-way throttle valve and the quick first pilot-operated one-way valve, and the rod chamber of the hydraulic cylinder communicates with the oil supply pipeline through the quick second one-way throttle valve and the quick second pilot-operated one-way valve, and the sliding gate is quickly opened until the sliding gate is opened to a preset opening degree, then de-energize one side electromagnetic coil of the slow three-position four-way valve and one side electromagnetic coil of the quick three-position four-way valve.

[0050] Step 130, when the sliding gate is closed, energize the other side electromagnetic coil of the slow three-position four-way valve, adjust the spool position of the slow three-position four-way valve, so that the rodless cavity of the sliding gate hydraulic cylinder communicates with the oil supply pipeline through the slow first one-way throttle valve and the slow first pilot-operated one-way valve, and the rod chamber of the hydraulic cylinder communicates with the return oil pipeline through the slow second one-way throttle valve and the slow second pilot-operated one-way valve, and the sliding gate is slowly closed for a second preset duration.

[0051] Step 140, energize the other side electromagnetic coil of the quick three-position four-way valve, adjust the spool position of the quick three-position four-way valve, so that the rodless cavity of the sliding gate hydraulic cylinder communicates with the oil supply pipeline through the quick first one-way throttle valve and the quick first pilot-operated one-way valve, and the rod chamber of the hydraulic cylinder communicates with the return oil pipeline through the quick second one-way throttle valve and the quick second pilot-operated one-way valve, and the sliding gate is quickly closed until the sliding gate is completely closed, then de-energize the other side electromagnetic coil of the slow three-position four-way valve and the other side electromagnetic coil of the quick three-position four-way valve.

[0052] In the present application, the first preset duration can specifically be 2.5 seconds or 2 seconds, and the second preset time can specifically be 2.5 seconds or 3 seconds, and the present application does not make specific limitations thereto.

[0053] In the present application, both the quick three-position four-way valve and the slow three-position four-way valve can switch the spool through different energized coils. Specifically, as Figure 1 shown, when the a4 coil of the quick three-position four-way valve is energized, the A4 port and the T4 port are connected, and the P4 port and the B4 port are connected. At this time, the rod chamber of the hydraulic cylinder communicates with the oil supply pipeline, and the rodless cavity communicates with the return oil pipeline, and the piston rod of the hydraulic cylinder retracts inward, and the sliding gate opens. When the b4 coil of the quick three-position four-way valve is energized, the A4 port and the P4 port are connected, and the T4 port and the B4 port are connected. At this time, the rod chamber of the hydraulic cylinder communicates with the return oil pipeline, and the rodless cavity communicates with the oil supply pipeline, and the piston rod of the hydraulic cylinder extends outward, and the sliding gate closes.

[0054] In this application, during the process of controlling the opening and closing of the hydraulic cylinder, first, through the slow switch device, the hydraulic cylinder is controlled to open and close at a slower speed. After a period of time, then through the fast switch device, the hydraulic cylinder is controlled to open and close at a faster speed. In this way, while ensuring the efficiency of the opening and closing of the hydraulic cylinder, the hydraulic shock and hydraulic fluctuation generated when the hydraulic cylinder is switched quickly can be reduced, and further the stability of the operation of the hydraulic system can be improved.

[0055] In the sliding gate hydraulic control method proposed in this application, the method may further include the following step 150:

[0056] Step 150, when the sliding gate is emergently closed, control the accident double-position four-way valve to lose power to adjust the spool position of the accident double-position four-way valve, so that the rodless cavity of the hydraulic cylinder is communicated with the oil inlet pipeline through the double-position four-way valve and the accident one-way valve, and the rod cavity of the hydraulic rod is communicated with the oil return pipeline through the accident hydraulic control one-way valve, and the sliding gate is emergently closed.

[0057] In this application, it should be noted that when the system is working normally, the accident double-position four-way valve is energized. At this time, the A3 port and the P3 port of the accident double-position four-way valve are disconnected, and hydraulic oil will not enter the hydraulic cylinder through the accident double-position four-way valve. When an accident occurs, the accident double-position four-way valve will lose power. At this time, the spool of the accident double-position four-way valve switches, the A3 port and the P3 port are connected, the rodless cavity of the hydraulic cylinder is communicated with the oil inlet pipeline through the accident double-position four-way valve, the rod cavity of the hydraulic cylinder is communicated with the oil return pipeline through the accident hydraulic control one-way valve, the piston rod of the hydraulic cylinder extends, and the sliding gate closes.

[0058] In this application, by setting an accident closing device, when an accident occurs, the sliding gate is controlled to close to avoid the leakage of molten steel and damage to equipment and staff, which can effectively improve the safety and stability of the operation of the hydraulic control system.

[0059] In the sliding gate hydraulic control method proposed in this application, the method may further include the following step 160:

[0060] Step 160, when the hydraulic cylinder of the sliding gate releases pressure, control the pressure relief double-position four-way valve to lose power to adjust the spool position of the pressure relief double-position four-way valve, so that both the rodless cavity and the rod cavity of the hydraulic cylinder are communicated with the oil return pipeline to release the pressure of the hydraulic cylinder.

[0061] In the present application, by providing the pressure release device, when it is necessary to install and disassemble the hydraulic cylinder, the pressure inside the hydraulic cylinder can be released, reducing the difficulty and danger of installation and disassembly, improving the safety of the system. When the system pressure is too high, the pressure inside the system can also be released through the pressure release device, thereby improving the stability of the system during operation.

[0062] Based on the technical solution proposed in the present application, firstly, by providing the accident energy storage device and the accident shutdown device, the system can timely close the hydraulic cylinder of the sliding gate when an accident occurs, preventing molten steel from flowing out and causing damage to the equipment and nearby operators, so as to improve the safety of the hydraulic system during operation; secondly, by providing the working energy storage device, the hydraulic fluctuations and hydraulic shocks in the hydraulic system can be more effectively absorbed, thereby improving the internal stability and safety of the hydraulic system and reducing the probability of accidents. Then, by providing the quick switch device and the slow switch device, the quick switch and slow switch of the hydraulic cylinder can be realized, improving the control accuracy of the sliding gate. Finally, by controlling the speed change of the switch of the hydraulic cylinder, the hydraulic shock and hydraulic fluctuation generated during the switch process can also be reduced, further improving the safety of the hydraulic control system; in addition, the hydraulic system is also provided with a pressure release device, which can release the pressure inside the hydraulic cylinder, enabling the installation and disassembly of the hydraulic cylinder to be more convenient and further improving the safety of the hydraulic system during operation.

[0063] The above are only the embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A sliding gate hydraulic control system, characterized in that, The system includes an oil inlet pipeline, an oil return pipeline, a working energy storage device, an accident energy storage device, an accident shutdown device, a quick switch device, a slow switch device, and a pressure release device. Among them, the oil inlet pipeline is connected to the oil outlet of the oil depot of the system and is used to provide hydraulic oil for the system; the oil return pipeline is connected to the oil return port of the oil depot of the system and is used to recover the hydraulic oil in the system; the working energy storage device is connected to the oil inlet pipeline and the oil return pipeline through pipelines and is used to absorb hydraulic shocks and hydraulic fluctuations inside the system; the accident energy storage device is connected to the oil inlet pipeline and the oil return pipeline through pipelines and is used to store hydraulic energy and provide hydraulic energy for the hydraulic cylinder that urgently closes the sliding nozzle; the accident shutdown device is connected to the accident energy storage device, the oil inlet pipeline, the oil return pipeline, and the hydraulic cylinder through pipelines and is used to urgently close the hydraulic cylinder; the quick switch device is connected to the oil inlet pipeline, the oil return pipeline, and the hydraulic cylinder through pipelines and is used to control the quick opening and quick closing of the hydraulic cylinder; the slow switch device is connected to the oil inlet pipeline, the oil return pipeline, and the hydraulic cylinder through pipelines and is used to control the slow opening and slow closing of the hydraulic cylinder; the pressure release device is connected to the oil inlet pipeline, the oil return pipeline, and the hydraulic cylinder through pipelines and is used to release the pressure inside the hydraulic cylinder.

2. The system according to claim 1, wherein The quick switch device includes: a quick three-position four-way valve, which is connected to the oil inlet pipeline and the oil return pipeline and controls the flow direction of the hydraulic oil by switching the spool to control the opening and closing of the hydraulic cylinder; a quick first pilot-operated check valve, which is connected to the quick three-position four-way valve through a pipeline and is used to stabilize the opening degree of the hydraulic cylinder when it is opened; a quick second pilot-operated check valve, which is connected to the quick three-position four-way valve through a pipeline and is used to stabilize the opening degree of the hydraulic cylinder when it is opened; a quick first one-way throttle valve, which is connected to the quick first pilot-operated check valve and the hydraulic cylinder through pipelines and is used to control the flow rate of the hydraulic oil; a quick second one-way throttle valve, which is connected to the quick second pilot-operated check valve and the hydraulic cylinder through pipelines and is used to control the flow rate of the hydraulic oil.

3. The system according to claim 1, characterized in that, The slow switch device includes: a slow three-position four-way valve, which is connected to the oil inlet pipeline and the oil return pipeline and controls the flow direction of the hydraulic oil by switching the spool to control the opening and closing of the hydraulic cylinder; a slow first pilot-operated check valve, which is connected to the slow three-position four-way valve through a pipeline and is used to stabilize the opening degree of the hydraulic cylinder when it is opened; a slow second pilot-operated check valve, which is connected to the slow three-position four-way valve through a pipeline and is used to stabilize the opening degree of the hydraulic cylinder when it is opened; a slow first one-way throttle valve, which is connected to the slow first pilot-operated check valve and the hydraulic cylinder through pipelines and is used to control the flow rate of the hydraulic oil; a slow second one-way throttle valve, which is connected to the slow second pilot-operated check valve and the hydraulic cylinder through pipelines and is used to control the flow rate of the hydraulic oil.

4. The system according to claim 1, wherein The accident shutdown device includes: Accident two-position four-way valve, which is connected to the oil inlet pipeline through a pipe, and controls the flow direction of hydraulic oil by switching the spool to control the opening and closing of the hydraulic cylinder; Accident one-way valve, which is connected to the accident two-position four-way valve and the hydraulic cylinder through pipes, and is used to control the flow direction of the hydraulic oil; Accident pilot-operated one-way valve, which is connected to the oil return pipeline and the hydraulic cylinder through pipes, and is used to control the flow direction of the hydraulic oil.

5. The system according to claim 1, wherein The pressure relief device includes: Pressure relief two-position four-way valve, which is connected to the oil return pipeline, and controls the flow direction of hydraulic oil by switching the spool to control the pressure relief in the hydraulic cylinder; First throttle plug, which is connected to the rodless cavity of the hydraulic cylinder and the pressure relief two-position four-way valve through pipes, and is used to control the flow rate of the hydraulic oil; Second throttle plug, which is connected to the rod cavity of the hydraulic cylinder and the pressure relief two-position four-way valve through pipes, and is used to control the flow rate of the hydraulic oil.

6. The system according to claim 1, wherein The working energy storage device includes: Piston-type working energy storage accumulator, which is connected to the oil inlet pipeline through a pipe, and is used to absorb hydraulic shock and hydraulic fluctuation inside the system; Working energy storage pressure gauge, which is connected to the piston-type working energy storage accumulator through a pipe, and is used to detect the pressure in the piston-type working energy storage accumulator; Working energy storage relay, which is connected to the piston-type working energy storage accumulator through a pipe, and is used to transmit the pressure data in the piston-type working energy storage accumulator to a remote terminal; Working energy storage accumulator safety valve, which is connected to the piston-type working energy storage accumulator through a pipe, and is used to control the pressure in the piston-type working energy storage accumulator to remain stable.

7. The system according to claim 1, wherein The accident energy storage device includes: Piston-type accident energy storage accumulator, which is connected to the oil inlet pipeline through a pipe, and is used to absorb hydraulic shock and hydraulic fluctuation inside the system; Accident energy storage pressure gauge, which is connected to the piston-type accident energy storage accumulator through a pipe, and is used to detect the pressure in the piston-type accident energy storage accumulator; Accident energy storage relay, which is connected to the piston-type accident energy storage accumulator through a pipe, and is used to transmit the pressure data in the piston-type accident energy storage accumulator to a remote terminal; Accident energy storage accumulator safety valve, which is connected to the piston-type accident energy storage accumulator through a pipe, and is used to control the pressure in the piston-type accident energy storage accumulator to remain stable.

8. A hydraulic control method for a sliding nozzle, characterized in that The method is applied to the system as described in claims 1 to 7, and the method includes: When the sliding gate is opened, control one side of the electromagnetic coil of the slow three-position four-way valve to be energized, adjust the spool position of the slow three-position four-way valve, so that the rodless cavity of the sliding gate hydraulic cylinder is connected to the oil return pipeline through the slow first one-way throttle valve and the slow first pilot-operated one-way valve, and the rod cavity of the hydraulic cylinder is connected to the oil inlet pipeline through the slow second one-way throttle valve and the slow second pilot-operated one-way valve, and the sliding gate is opened slowly for a first preset duration; Energize one side of the electromagnetic coil of the quick three-position four-way valve to adjust the spool position of the quick three-position four-way valve, so that the rodless chamber of the sliding gate hydraulic cylinder communicates with the oil return pipeline through the quick first one-way throttle valve and the quick first pilot-operated one-way valve, and the rod chamber of the hydraulic cylinder communicates with the oil supply pipeline through the quick second one-way throttle valve and the quick second pilot-operated one-way valve, and the sliding gate is quickly opened until the sliding gate is opened to a preset opening degree, then de-energize one side of the electromagnetic coil of the slow three-position four-way valve and one side of the electromagnetic coil of the quick three-position four-way valve; When the sliding gate is closed, energize the other side of the electromagnetic coil of the slow three-position four-way valve to adjust the spool position of the slow three-position four-way valve, so that the rodless chamber of the sliding gate hydraulic cylinder communicates with the oil supply pipeline through the slow first one-way throttle valve and the slow first pilot-operated one-way valve, and the rod chamber of the hydraulic cylinder communicates with the oil return pipeline through the slow second one-way throttle valve and the slow second pilot-operated one-way valve, and the sliding gate is slowly closed for a second preset duration; Energize the other side of the electromagnetic coil of the quick three-position four-way valve to adjust the spool position of the quick three-position four-way valve, so that the rodless chamber of the sliding gate hydraulic cylinder communicates with the oil supply pipeline through the quick first one-way throttle valve and the quick first pilot-operated one-way valve, and the rod chamber of the hydraulic cylinder communicates with the oil return pipeline through the quick second one-way throttle valve and the quick second pilot-operated one-way valve, and the sliding gate is quickly closed until the sliding gate is completely closed, then de-energize the other side of the electromagnetic coil of the slow three-position four-way valve and the other side of the electromagnetic coil of the quick three-position four-way valve.

9. The method according to claim 8, characterized in that The method further includes: When the sliding gate is emergently closed, de-energize the emergency two-position four-way valve to adjust the spool position of the emergency two-position four-way valve, so that the rodless chamber of the hydraulic cylinder communicates with the oil supply pipeline through the two-position four-way valve and the emergency one-way valve, and the rod chamber of the hydraulic rod communicates with the oil return pipeline through the emergency pilot-operated one-way valve, and the sliding gate is emergently closed.

10. The method according to claim 8, wherein The method further includes: When the hydraulic cylinder of the sliding gate releases pressure, de-energize the pressure relief two-position four-way valve to adjust the spool position of the pressure relief two-position four-way valve, so that both the rodless chamber and the rod chamber of the hydraulic cylinder communicate with the oil return pipeline to release the pressure of the hydraulic cylinder.

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