Hydraulic system for continuous casting bale

Abstract

The invention relates to the field of continuous casting bale hydraulic systems, and particularly discloses a continuous casting bale hydraulic system which comprises an oil tank, the oil tank communicates with an oil supply pipeline, the oil supply pipeline is provided with an oil supply module, and the oil supply module comprises a power module, a pressure relief module and a high-pressure oil filter which are sequentially connected in series; the power module comprises a power motor and a pump head which are matched in a linkage mode, the starting pressurization mode of the pump head is a power-loss pressure rising mode, the two oil supply modules are connected to the oil supply pipeline in parallel, the working pressure of the power module in one oil supply module is P1, the working pressure of the power module in the other oil supply module is P2, and P2 is larger than P1. The two oil supply modules with different working pressures are connected to the oil supply pipeline in parallel and used for treating the emergency situation that a sudden water gap is too tight to assemble and cannot be opened; and the power module adopts a power-losing pressure rising mode, so that the condition of carbonization and oxidation caused by overheating of a pump head pressurizing valve after long-term power obtaining can be effectively avoided.

Description

Technical Field

[0001] The invention relates to the field of hydraulic systems for continuous casting ladles, and in particular to a hydraulic system for continuous casting ladles. Background Art

[0002] Continuous steel casting (continuous casting) is an advanced steel production process that directly casts molten steel into steel billets through a continuous casting machine, thereby replacing mold casting and rolling out of billets. Ladle is also called steel ladle, steel ladle, ladle, etc. It is a device used to hold, carry and pour molten steel, and is also a container for refining molten steel outside the furnace. The main function of the hydraulic system for continuous casting ladle is to provide pressure for the ladle cylinder to pull open the ladle slider to flow out the molten iron, and also to provide pressure for the rotation and lifting of the ladle cover.

[0003] The existing patent number is CN111804902A, which is a continuous casting turntable water nozzle control system and method. The system includes: a main hydraulic module and an emergency hydraulic module. The main hydraulic module and the emergency hydraulic module are connected in parallel and connected to the execution module. The main hydraulic module inputs a first driving pressure P1 to the emergency hydraulic module, and the emergency hydraulic module inputs a second driving pressure P2 to the emergency hydraulic module. The second hydraulic system pressure setting matches the first hydraulic system pressure, that is, P1=P2. The emergency hydraulic module includes: an uninterruptible power supply, a hydraulic station, and an operating switch box; the pipeline of the hydraulic station is connected to the pipeline of the main hydraulic module, and the operating switch box is used to control the switch of the hydraulic station; the hydraulic station provides uninterruptible power supply to the hydraulic station.

[0004] As mentioned above, in the existing hydraulic system for continuous casting ladle, the pressure setting of the second hydraulic system is usually matched with the pressure of the first hydraulic system, that is, P1=P2, but the water inlet assembly is too tight and cannot be opened, which has low safety. In addition, the hydraulic station in the existing emergency hydraulic module adopts an uninterrupted power supply mode, which makes it easy for the pump head pressure valve to overheat due to long-term power supply, causing carbonization and oxidation, and has low practicality. Summary of the invention

[0005] The present invention provides a hydraulic system for continuous casting ladle to solve the technical problems in the prior art that the water inlet is easily assembled too tightly and cannot be opened, the safety is low, the pump head pressure boosting valve is easily overheated due to long-term power supply and causes carbonization and oxidation, and the practicality is low.

[0006] In order to solve the above problems, the hydraulic system for continuous casting ladle provided by the present invention adopts the following technical scheme: it includes an oil tank, the oil tank is connected to an oil supply pipeline, an oil supply module is arranged on the oil supply pipeline, the oil supply module includes a power module, a pressure relief module, and a high-pressure oil filter which are connected in series in sequence along a side away from the oil tank; the power module includes a linked power motor and a pump head, the starting and pressurizing mode of the pump head is a power-off pressure starting mode, the oil supply module includes two groups, the two groups of oil supply modules are connected in parallel on the oil supply pipeline, the working pressure of the power module in one group of oil supply modules is P1, P1 is (15-20)Mpa, and the working pressure of the power module in the other group of oil supply modules is P2, P2 is (18-23)Mpa, and P2>P1.

[0007] Furthermore, P1 is 15 MPa, P2 is 18 MPa, the power N of the power motor is 45 KW, the rotation speed n is 980 r / min, and the nominal displacement q of the pump head is 70 mL / r.

[0008] Furthermore, the pressure relief module includes a control valve, an overflow valve, and an electromagnetic reversing valve. The control valve includes two groups, namely a first control valve and a second control valve. The first control valve is installed on the oil supply pipeline. The oil inlet and oil outlet of the first control valve are respectively interconnected with the pump head and the high-pressure oil filter. The first control valve is connected to an oil leakage circuit, and the oil leakage circuit is connected to the oil tank. The second control valve, the overflow valve, and the electromagnetic reversing valve are connected in parallel on the oil leakage circuit.

[0009] Furthermore, the oil supply module also includes a butterfly valve, which is located on the side of the power module facing the oil tank. A shock-absorbing throat is arranged between the butterfly valve and the power module, and a travel switch is arranged on the butterfly valve.

[0010] Furthermore, the oil tank is connected to an oil return pipeline, and an oil return filter is arranged on the oil return pipeline. The pump heads in the two groups of oil supply pipelines are interconnected with the oil return filter located on the oil return pipeline.

[0011] Furthermore, a circulating pump cooler is provided on the oil return pipeline at a side of the oil return filter away from the oil tank, and a heater is provided on the oil tank.

[0012] Furthermore, it also includes a control system, a temperature monitor is arranged on the oil tank, and the temperature detector, circulating pump cooler and heater are all electrically connected to the control system; when the control system controls the heater to be turned on and off, the corresponding temperatures detected by the temperature monitor are 10°C and 30°C respectively; when the control system controls the circulating pump cooler to be turned on and off, the corresponding temperatures detected by the temperature monitor are 55°C and 45°C respectively.

[0013] Furthermore, it also includes an accumulator, the working pressure of the accumulator is P3, P3<P1, the accumulator is connected to a safety valve, the safety valve includes a switch valve and a return valve, the switch valve includes two groups, the return valve and the two groups of switch valves are connected in parallel, the two groups of switch valves are respectively connected to the oil supply pipeline and the oil return pipeline, and the return valve is connected to the oil return pipeline.

[0014] Furthermore, a liquid level gauge is provided on the oil tank, and the liquid level gauge is a flap type liquid level gauge, and valves are installed at both upper and lower ends of the liquid level gauge.

[0015] Furthermore, it also includes a working medium, which is water-ethylene glycol, the filtration accuracy of the working medium is 10 μm, and the oil tank and pipelines are all made of stainless steel.

[0016] The beneficial effects of the hydraulic system for continuous casting ladle provided by the present invention are:

[0017] 1. Two sets of oil supply modules with different working pressures are connected in parallel on the oil supply pipeline to deal with the emergency situation where the water outlet is too tight to open;

[0018] 2. The power module adopts the power-off pressure-starting mode, that is, when the power is disconnected, the pump head will automatically pressurize, which can effectively reduce the heat generated by the power module, and thus effectively avoid the situation where the pump head pressurization valve is overheated due to long-term power supply and causes carbonization and oxidation, and help reduce the impact and wear when the system is started, and extend the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0020] Figure 1 It is a structural schematic diagram of a hydraulic system for a continuous casting ladle of the present invention;

[0021] Figure 2 It is a structural schematic diagram of an oil supply pipeline of a hydraulic system for a continuous casting ladle of the present invention;

[0022] Figure 3 It is a structural schematic diagram of an oil return pipeline of a hydraulic system for a continuous casting ladle of the present invention;

[0023] Figure 4 The present invention is a schematic structural diagram of an accumulator and a safety valve of a hydraulic system for a continuous casting ladle.

[0024] Description of reference numerals:

[0025] 1. Fuel tank;

[0026] 2. Oil supply pipeline;

[0027] 21. Oil supply module;

[0028] 211, power module; 2111, power motor; 2112, pump head;

[0029] 212, pressure relief module; 2121, control valve; 201, first control valve; 202, second control valve; 203, oil leakage circuit; 2122, overflow valve; 2123, solenoid reversing valve;

[0030] 213. High pressure oil filter;

[0031] 214, butterfly valve; 2141, shock absorber throat; 2142, travel switch;

[0032] 3. Oil return pipeline; 31. Oil return filter; 32. Circulating pump cooler;

[0033] 4. Accumulator; 41. Safety valve; 411. Switch valve; 412. Return valve. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0035] Any number of elements in the drawings is for illustration and not limitation, and any naming is for distinction only and does not have any limiting meaning.

[0036] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0037] The present invention provides a hydraulic system for continuous casting ladle, such as Figures 1 to 4As shown, it includes a fuel tank 1, which is connected to a fuel supply pipeline 2, on which a fuel supply module 21 is arranged, and the fuel supply module 21 includes a power module 211, a pressure relief module 212, and a high-pressure oil filter 213 which are sequentially connected in series along a side away from the fuel tank 1; the power module 211 includes a power motor 2111 and a pump head 2112 which are linked together, and the starting and pressurizing mode of the pump head 2112 is a power-off pressurizing mode, and the fuel supply module 21 includes two groups, and the two groups of fuel supply modules 21 are connected in parallel on the fuel supply pipeline 2, and the working pressure of the power module 211 in one group of fuel supply modules 21 is P1, and P1 is (15-20)Mpa, and the working pressure of the power module 211 in the other group of fuel supply modules 21 is P2, and P2 is (18-23)Mpa, and P2>P1.

[0038] In this embodiment, a pressure gauge is provided on the oil supply pipeline 2 between the two groups of the oil supply modules 21 so as to monitor the pressure state of the oil supply pipeline 2 in real time.

[0039] In this embodiment, two groups of oil supply modules 21 with different working pressures are connected in parallel on the oil supply pipeline 2 to deal with emergency situations where the water outlet is too tight to open, and the working pressure can be flexibly adjusted according to actual needs, which can effectively improve the adaptability and stability of the system.

[0040] In this embodiment, the two groups of oil supply modules 21 serve as backup for each other. When one group fails, the other group can be put into operation immediately to ensure the normal operation of the continuous casting ladle, which is more practical.

[0041] In this embodiment, the power module 211 adopts a power-off pressurization mode, that is, when the power is disconnected, the pump head 2112 will automatically pressurize, which can effectively reduce the heat generated by the power module 211, and thus effectively avoid the situation where the pump head 2112 pressurization valve is overheated due to long-term power supply and causes carbonization and oxidation, and helps to reduce the impact and wear during system startup and extend the service life of the equipment.

[0042] It should be noted that the principle of the hydraulic system for continuous casting ladle is mainly based on Pascal's law and hydraulic transmission principle, that is, the law of transmission of fluid static pressure in a closed liquid. Specifically, the hydraulic pump converts the liquid pressure into mechanical energy, thereby driving various hydraulic components (such as hydraulic cylinders, hydraulic valves, etc.) to work.

[0043] In this embodiment, in the hydraulic system for continuous casting ladle, the oil tank 1 stores oil and delivers the oil to various hydraulic components through the oil supply line 2. The power module 211 (including the power motor 2111 and the pump head 2112) in the oil supply module 21 is responsible for providing pressure oil, and its working pressure can be adjusted according to actual needs. The pressure relief module 212 is used to release part of the pressure when the system pressure is too high to protect the system from damage. The high-pressure oil filter 213 can effectively filter out impurities and particulate matter in the oil to ensure the cleanliness of the oil, thereby improving the performance and stability of the system. In this embodiment, when the power module 211 is started, it will suck the oil in the oil tank 1 and pressurize it and deliver it to the oil supply line 2. When the oil flows on the oil supply line 2, it will pass through various hydraulic components, which distribute, regulate and guide the oil according to the control signal, thereby realizing various action controls of the continuous casting ladle.

[0044] In this embodiment, P1 is 15 MPa, P2 is 18 MPa, the power N of the power motor 2111 is 45 KW, the rotation speed n is 980 r / min, and the nominal displacement q of the pump head 2112 is 70 mL / r.

[0045] It should be noted that there is a certain relationship between the power N of the power motor 2111 and the output pressure P, displacement q and speed n of the pump head 2112, which can usually be expressed as:

[0046]

[0047] Wherein, η is the efficiency of the pump, which is usually a number less than 1, indicating the loss of the pump when converting energy. It can be seen from the above relationship that as the pressure increases, the theoretical input power of the pump will also increase, that is, the input power of the pump head 2112 in the power module 211 with P2 of 18Mpa is greater than the input power of the pump head 2112 in the power module 211 with P1 of 15Mpa. In this embodiment, the increased performance of the motor can make the pressure of the oil supply pipeline 2 more stable, making the system more practical.

[0048] In this embodiment, the pressure relief module 212 includes a control valve 2121, a relief valve 2122, and an electromagnetic reversing valve 2123. The control valve 2121 includes two groups, namely a first control valve 201 and a second control valve 202. The first control valve 201 is installed on the oil supply pipeline 2. The oil inlet end and the oil outlet end of the first control valve 201 are respectively interconnected with the pump head 2112 and the high-pressure oil filter 213. The first control valve 201 is connected to the oil leakage oil circuit 203, and the oil leakage oil circuit 203 is interconnected with the oil tank 1. The second control valve 202, the relief valve 2122, and the electromagnetic reversing valve 2123 are connected in parallel on the oil leakage oil circuit 203.

[0049] In this embodiment, the overflow valve 2122 is a pressure control valve 2121, which is used to limit the maximum working pressure of the system. When the system pressure exceeds the set value of the overflow valve 2122, the overflow valve 2122 will open and discharge the excess oil back to the oil tank 1, thereby protecting the system from damage caused by excessive pressure. The electromagnetic reversing valve 2123 is a valve that controls the flow direction of the oil through electromagnetic force; the oil output by the pump head 2112 first passes through the first control valve 201, and then is filtered through the high-pressure oil filter 213 to remove impurities and particulate matter. When the system pressure exceeds the set value, the excess oil can be discharged back to the oil tank 1 through the oil leakage circuit 203; the second control valve 202 is used to control the flow direction and flow rate of the oil on the oil leakage circuit 203 under specific conditions.

[0050] In this embodiment, the pressure relief module 212 is mainly responsible for controlling the pressure of the system and releasing the excess oil back to the oil tank 1 when necessary, which can effectively protect the various components of the system from being damaged by excessive pressure.

[0051] In this embodiment, the oil supply module 21 also includes a butterfly valve 214, which is located on the side of the power module 211 facing the oil tank 1. A shock absorber throat 2141 is arranged between the butterfly valve 214 and the power module 211, and a travel switch 2142 is arranged on the butterfly valve 214. The butterfly valve 214, the shock absorber throat 2141 and the travel switch 2142 work together in the oil supply module 21 to achieve precise control of oil flow, effective reduction of system vibration and accurate detection of the movement state of the equipment, which can effectively improve the safety, stability and reliability of the system.

[0052] In this embodiment, the butterfly valve 214 is installed on the pipeline between the pump head 2112 or the power motor 2111 and the oil tank 1, and is used to control the channel for the oil to flow from the power module 211 to the oil tank 1, and to adjust or cut off the flow of oil in the pipeline. By rotating the handle or actuator of the butterfly valve 214, the angle of the valve disc (i.e., the butterfly plate) can be changed to control the flow rate of the oil or completely cut off the oil flow. It can be used in emergency shutdown, system maintenance, or adjustment of system flow, etc.

[0053] It should be noted that the operation of the pump head 2112 will generate certain vibrations and pulsations, and the shock absorber throat 2141 (also called a flexible joint or an expansion joint) is a component used to absorb and reduce the vibration and displacement of the pipeline system. In the hydraulic system. In this embodiment, the shock absorber throat 2141 can effectively reduce the impact of the vibration generated when the pump head 2112 is running on the power module 211 and the pipeline system, thereby effectively improving the stability and reliability of the system. At the same time, the shock absorber throat 2141 can also compensate for changes in pipeline length caused by temperature changes or installation errors.

[0054] It should be noted that the travel switch 2142 is a switch used to detect and control the movement position of mechanical equipment. In this embodiment, when the butterfly valve 214 is opened or closed to a specific position, the travel switch 2142 will be triggered, thereby sending a signal to the control system (described below), and this signal is used to indicate the state of the butterfly valve 214, control the operation of other equipment, or trigger a safety protection mechanism.

[0055] It should be noted that the oil tank 1 is not only a place to store oil, but also the starting point and end point of the oil circulation of the entire system.

[0056] In this embodiment, the oil tank 1 is connected to the oil return line 3, and the oil return line 3 is provided with an oil return filter 31 for filtering the oil flowing back from each hydraulic component to remove impurities and particles therein, thereby ensuring the cleanliness of the oil and extending the service life of the system. The oil return line 3 is a channel connecting each hydraulic component with the oil tank 1. After completing its working task (such as driving the actuator), the oil will flow back to the oil tank 1 through the oil return line 3 for reuse.

[0057] In this embodiment, the pump heads 2112 in the two groups of oil supply pipelines 2 are interconnected with the return oil filter 31 on the return oil pipeline 3, that is, part of the oil flowing back from the system is returned to the oil tank 1 for storage, and part is input into the pump head 2112, ensuring that the oil can circulate smoothly in the system and be effectively recovered and filtered when necessary.

[0058] In this embodiment, when the pump head 2112 is working, it will suck in the clean oil in the oil tank 1 and on the return oil pipeline 3 that has been filtered by the return oil filter 31, and transport it to various components of the system after pressurizing it. After completing the working task, the oil will flow back to the oil tank 1 through the return oil pipeline 3, and be filtered by the return oil filter 31 to remove impurities and particulate matter therein. Then, the clean oil will be sucked in by the pump head 2112 again, starting a new round of circulation.

[0059] It should be noted that during the operation of the hydraulic system, due to friction, compression and leakage, the temperature of the oil will gradually increase. If the oil temperature is too high, it may cause problems such as system performance degradation, oil deterioration and component damage; in a low temperature environment, the viscosity of the oil will increase and the fluidity will deteriorate, which may cause problems such as difficulty in starting the system, performance degradation and component wear. In this embodiment, a circulating pump cooler 32 is provided on the return oil pipeline 3 on the side of the return oil filter 31 away from the oil tank 1, and a heater is provided on the oil tank 1 to cool and heat the oil, thereby ensuring the continuous circulation and effective use of the oil in the system. In this embodiment, the main function of the circulating pump cooler 32 is to cool the oil flowing back from the system. By cooling the oil with the circulating pump cooler 32, the temperature of the oil can be kept within a suitable range, thereby extending the service life of the system and improving the stability of the system; the main function of the heater is to heat the oil in the oil tank 1. By heating the oil in the oil tank 1 with the heater, the viscosity of the oil can be reduced and its fluidity can be improved, thereby ensuring that the system can operate normally in a low temperature environment.

[0060] In this embodiment, a control system is also included. A temperature monitor is provided on the oil tank 1. The temperature detector, the circulating pump cooler 32, and the heater are all electrically connected to the control system. When the control system controls the heater to be turned on and off, the corresponding temperatures detected by the temperature monitor are 10°C and 30°C respectively. When the control system controls the circulating pump cooler 32 to be turned on and off, the corresponding temperatures detected by the temperature monitor are 55°C and 45°C respectively.

[0061] In this embodiment, when the temperature detected by the temperature monitor is lower than 10°C, the control system will turn on the heater to increase the temperature of the oil in the oil tank 1; when the temperature detected by the temperature monitor reaches or exceeds 30°C, the control system will turn off the heater to prevent the oil from overheating; when the temperature detected by the temperature monitor reaches or exceeds 55°C, the control system will turn on the circulating pump cooler 32 to lower the temperature of the oil in the oil tank 1; when the temperature detected by the temperature monitor drops below 45°C, the control system will turn off the circulating pump cooler 32 to save energy and reduce equipment wear.

[0062] In this embodiment, by properly controlling the working time of the heater and the circulating pump cooler 32, the system can save energy and reduce the wear of the equipment, which helps to reduce the operating cost of the system and extend the service life of the equipment.

[0063] In this embodiment, an accumulator 4 is also included. The working pressure of the accumulator 4 is P3, where P3<P1. The accumulator 4 can store a certain amount of energy when the system operates normally, and release the energy when the system pressure drops to maintain the stability of the system.

[0064] In this embodiment, the accumulator 4 is connected to a safety valve 41, which includes a switch valve 411 and a return valve 412. The switch valve 411 includes two groups. The return valve 412 and the two groups of switch valves 411 are connected in parallel. The two groups of switch valves 411 are respectively connected to the oil supply pipeline 2 and the oil return pipeline 3, and the return valve 412 is connected to the oil return pipeline 3.

[0065] In this embodiment, the switch valve 411 is used to control the connection state between the accumulator 4 and the oil supply pipeline 2 and the oil return pipeline 3. When the accumulator 4 needs to be pressurized, the switch valve 411 connected to the oil supply pipeline 2 can be opened; when the energy in the accumulator 4 needs to be released, the switch valve 411 connected to the oil return pipeline 3 can be opened. The return valve 412 is used to quickly discharge the oil in the accumulator 4 back to the oil tank 1 when the system pressure rises abnormally to protect the system from damage. At the same time, the return valve 412 can also empty the oil in the accumulator 4 when the system is shut down or maintained, so as to facilitate the inspection and maintenance of the equipment. In this embodiment, the return valve 412 and the two sets of switch valves 411 are connected in parallel to form a parallel oil circuit system, which can flexibly control the connection state between the accumulator 4 and the oil supply pipeline 2 and the oil return pipeline 3 as needed.

[0066] In this embodiment, the accumulators 4 include three groups, and the three groups of accumulators 4 are sequentially connected in series to the oil supply pipeline 2 and the oil return pipeline 3, which can make the pipeline pressure of the system more stable.

[0067] In this embodiment, a liquid level gauge is provided on the oil tank 1. The liquid level gauge is a flap type liquid level gauge. By converting the change of the liquid level into the change of the flap angle, the amount of oil in the oil tank 1 can be intuitively displayed, which is more practical. Valves are installed at the upper and lower ends of the liquid level gauge. When the liquid level gauge needs to be repaired or replaced, these valves can cut off the flow of oil to ensure the safety of operation. At the same time, it can also prevent oil leakage when the system is shut down or maintained.

[0068] In this embodiment, a working medium is also included, which is water-ethylene glycol, has good flame retardancy, rust resistance and lubricity, and has a low viscosity. The filtration accuracy of the working medium is 10 μm. The oil tank 1 and the pipeline are both made of stainless steel, which has excellent corrosion resistance, high temperature resistance and strength.

[0069] In this embodiment, the pressure relief module 212 is installed above the oil tank 1, and the power module 211 is installed on one side of the oil tank 1. The system integrates multiple components such as the oil tank 1, the pressure relief module 212, the power module 211, the high-pressure filter, and the reflux filter into an independent hydraulic source, which not only simplifies the structure of the system, ensures the compactness and maintainability of the system, but also effectively improves the reliability and stability of the system.

[0070] The hydraulic system for continuous casting ladles provided by the present invention realizes efficient, stable and precise control of continuous casting ladles by utilizing Pascal's law and hydraulic transmission principle.

[0071] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "width", "horizontal", "top", "bottom", "inside", "outside" and the like, which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the devices or elements involved must have the specific orientation, be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0072] In addition, in the description of this specification, “plurality” means at least two, for example, two, three or more, etc., unless otherwise clearly and specifically defined.

Claims

1. A hydraulic system for continuous casting ladle, characterized in that: It includes an oil tank, which is connected to an oil supply pipeline. An oil supply module is arranged on the oil supply pipeline. The oil supply module includes a power module, a pressure relief module, and a high-pressure oil filter which are connected in series in sequence along a side away from the oil tank; the power module includes a linked power motor and a pump head, and the starting and pressurizing mode of the pump head is a power-off pressure starting mode. The oil supply module includes two groups, and the two groups of oil supply modules are connected in parallel on the oil supply pipeline. The working pressure of the power module in one group of oil supply modules is P1, and P1 is (15-20)Mpa. The working pressure of the power module in the other group of oil supply modules is P2, and P2 is (18-23)Mpa, and P2>P1.

2. A hydraulic system for continuous casting ladle according to claim 1, characterized in that: P1 is 15Mpa, P2 is 18Mpa, the power N of the power motor is 45KW, the speed n is 980r / min, and the nominal displacement q of the pump head is 70mL / r.

3. A hydraulic system for continuous casting ladle according to claim 1, characterized in that: The pressure relief module includes a control valve, an overflow valve, and an electromagnetic reversing valve. The control valve includes two groups, namely a first control valve and a second control valve. The first control valve is installed on the oil supply pipeline. The oil inlet end and the oil outlet end of the first control valve are respectively interconnected with the pump head and the high-pressure oil filter. The first control valve is connected to an oil leakage circuit, and the oil leakage circuit is connected to the oil tank. The second control valve, the overflow valve, and the electromagnetic reversing valve are connected in parallel on the oil leakage circuit.

4. A hydraulic system for continuous casting ladle according to any one of claims 1 to 3, characterized in that: The oil supply module also includes a butterfly valve, which is located on the side of the power module facing the oil tank. A shock-absorbing throat is arranged between the butterfly valve and the power module, and a travel switch is arranged on the butterfly valve.

5. A hydraulic system for continuous casting ladle according to any one of claims 1 to 3, characterized in that: The oil tank is connected with an oil return pipeline, and an oil return filter is arranged on the oil return pipeline. The pump heads in the two groups of oil supply pipelines are mutually connected with the oil return filter located on the oil return pipeline.

6. A hydraulic system for continuous casting ladle according to claim 5, characterized in that: A circulating pump cooler is arranged on the oil return pipeline at the side of the oil return filter away from the oil tank, and a heater is arranged on the oil tank.

7. A hydraulic system for continuous casting ladle according to claim 6, characterized in that: It also includes a control system, in which a temperature monitor is arranged on the oil tank, and the temperature detector, circulating pump cooler and heater are all electrically connected to the control system; when the control system controls the heater to be turned on and off, the corresponding temperatures detected by the temperature monitor are 10°C and 30°C respectively; when the control system controls the circulating pump cooler to be turned on and off, the corresponding temperatures detected by the temperature monitor are 55°C and 45°C respectively.

8. The hydraulic system for continuous casting ladle according to claim 5, characterized in that: It also includes an accumulator, the working pressure of the accumulator is P3, P3<P1, the accumulator is connected to a safety valve, the safety valve includes a switch valve and a return valve, the switch valve includes two groups, the return valve and the two groups of switch valves are connected in parallel, the two groups of switch valves are respectively connected to the oil supply pipeline and the oil return pipeline, and the return valve is connected to the oil return pipeline.

9. A hydraulic system for continuous casting ladle according to any one of claims 1 to 3, characterized in that: A liquid level gauge is provided on the oil tank. The liquid level gauge is a flap type liquid level gauge, and valves are installed at the upper and lower ends of the liquid level gauge.

10. A hydraulic system for continuous casting ladle according to any one of claims 1 to 3, characterized in that: It also includes a working medium, which is water-ethylene glycol, with a filtration accuracy of 10 μm, and the oil tank and pipelines are all stainless steel.

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