An electrode hydraulic control system and control method for a submerged arc furnace

Abstract

The present invention relates to the technical field of hydraulic control for submerged arc furnaces, and more specifically to an electrode hydraulic control system and control method for a submerged arc furnace, comprising: a circulating oil circuit, connected to cylinder assemblies via a plurality of reciprocating oil circuits; a first accumulator, connected to the reciprocating oil circuit of an upper brake cylinder group, synchronously storing and discharging energy during the oil supply and return process of the upper brake cylinder group, and used for feedback control of the reciprocating oil circuit of a lower brake cylinder group; a second accumulator, connected to the reciprocating oil circuit of a lower brake cylinder group, synchronously storing and discharging energy during the oil supply and return process of the lower brake cylinder group, and used for feedback control of the reciprocating oil circuit of an electrode cylinder; and a third control branch, working in conjunction with the second control branch to control the reciprocating oil circuit of the electrode cylinder group. The present invention prevents damage to the electrodes caused by simultaneous tightening or loosening of the upper and lower brakes during the hydraulic control process, and can ensure normal and stable operation of the hydraulic system through remote control, PLC control, or even manual operation.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic control of a submerged arc furnace, and in particular to an electrode hydraulic control system and a control method of a submerged arc furnace. Background Art

[0002] The three-electrode systems of existing large-scale submerged arc furnaces all use hydraulic equipment to control the lifting and pressing of electrodes to achieve the connection of the smelting circuit and the control of the furnace condition.

[0003] The main mechanical equipment involved in the operation includes the upper brake, the lower brake and the electrode cylinder connected to the upper and lower brakes. These three parts are all controlled by hydraulics.

[0004] In the hydraulic control system currently used in submerged arc furnaces, the upper brake, lower brake, and electrode cylinder hydraulic systems are independently controlled. However, there are three control logics that must be noted:

[0005] 1. The electrodes will fall when the upper and lower brakes are opened at the same time, so the upper and lower brakes cannot be opened at the same time;

[0006] 2. When the upper and lower brakes are tightened at the same time, if the electrode cylinder is running, the electrode will be broken. Therefore, the electrode cylinder cannot be operated in this state;

[0007] 3. When returning oil, you must first lower the brake and tighten it, and then raise the brake to open it.

[0008] To achieve this logical operating relationship, existing hydraulic systems can only use PLC programming for logical control. When computer control is unavailable, manual valve control is used. The rationality of the operation depends entirely on the operator's professional level, and the inevitability of the logical relationship during hydraulic control cannot be guaranteed, posing certain safety risks.

[0009] Clearly, the existing hydraulic control system still has room for improvement. Its reliability is insufficient, and optimization and improvement are needed to ensure safe and reliable electrode fixation while preventing damage to the electrode by the cylinder. Therefore, a more reasonable technical solution is needed to address the technical problems existing in the existing technology. Summary of the Invention

[0010] In order to overcome at least one of the above-mentioned defects, the present invention proposes an electrode hydraulic control system for an electric arc furnace. Through the interrelated effects of hydraulic mechanical components, the operating logic of the electric arc furnace electrodes during the lifting, pressing and releasing processes is controlled to achieve the purpose of safe production.

[0011] In order to achieve the above objectives, the electrode hydraulic control system disclosed in the present invention can adopt the following technical solutions:

[0012] An electrode hydraulic control system for a submerged arc furnace, comprising:

[0013] The circulating oil circuit is connected to the cylinder assemblies through a plurality of reciprocating oil circuits. The cylinder assemblies are actuated by oil from the circulating oil circuit through the reciprocating oil circuit and reset by oil returned to the circulating oil circuit. The cylinder assemblies include an upper brake cylinder group for driving the upper brake action, a lower brake cylinder group for driving the lower brake action, and an electrode cylinder group for driving the electrode action.

[0014] The first accumulator, whose inlet and outlet oil pipelines are connected to the reciprocating oil circuit of the upper brake cylinder group, stores energy when the upper brake cylinder group receives oil, and discharges energy when the upper brake cylinder group returns oil. The first accumulator is connected to the reciprocating oil circuit of the lower brake cylinder group through a first control branch, and is used to open the reciprocating oil circuit of the lower brake cylinder group when the first accumulator reaches a set pressure, and otherwise remain closed.

[0015] The second accumulator, whose inlet and outlet oil pipelines are connected to the reciprocating oil circuit of the lower brake cylinder group, stores energy when the lower brake cylinder group receives oil, and discharges energy when the lower brake cylinder group returns oil; the second accumulator is connected to the reciprocating oil circuit of the electrode cylinder group through a second control branch, and is used to open the reciprocating oil circuit of the electrode cylinder when the second accumulator reaches a set pressure, and otherwise remain closed;

[0016] The third control branch extends from the reciprocating oil circuit of the upper brake cylinder group to the reciprocating oil circuit of the electrode cylinder group, and is used to block the reciprocating oil circuit of the electrode cylinder group when the reciprocating oil circuit of the upper brake cylinder receives oil; the third control branch works together with the second control branch to control the on and off of the reciprocating oil circuit of the electrode cylinder group.

[0017] The hydraulic control system disclosed above is equipped with a first control branch, a second control branch and a third control branch between the upper brake cylinder group, the lower brake cylinder group and the electrode cylinder group. During the operation of the upper brake cylinder group and the lower brake cylinder group, the movement of the electrode cylinder group is restricted to protect the electrode cylinder group, making the action logic of the hydraulic control system clearer and controllable. Whether through remote computer control, PLC control or on-site manual operation, it can effectively ensure the stable operation of the hydraulic control system and avoid system failure or operation damage.

[0018] Furthermore, in the present invention, in order to avoid the situation where the upper brake cylinder and the lower brake cylinder are loosened at the same time and the electrode falls off, optimization is performed here and one of the feasible options is given: the lower brake cylinder group is provided with a protection branch, one end of the protection branch is connected to the reciprocating oil circuit of the lower brake cylinder group and the inlet and outlet oil circuits of the second accumulator, and the other end extends and is connected to the circulating oil circuit to return oil; a protection control valve is provided on the protection branch, and a fourth control branch is provided on the reciprocating oil circuit of the upper brake cylinder group and is connected to the protection control valve. When the reciprocating oil circuit of the upper brake cylinder group is flowing with oil, the fourth control branch closes the protection control valve. When the reciprocating oil circuit of the upper brake cylinder group loses oil pressure due to oil leakage, the fourth control branch opens the protection control valve to drain the reciprocating oil circuit of the lower brake cylinder group. When such a solution is adopted, the oil pressure in the reciprocating oil circuit controls the closure of the protection control valve when the upper brake cylinder group obtains oil. Under normal circumstances, the protection branch is in a blocked state, and the reciprocating oil circuit of the lower brake cylinder group cannot drain oil from the protection branch; when some abnormal conditions occur and cause the upper brake cylinder group to drain oil and lose pressure before the lower brake cylinder group, the fourth control branch cannot provide sufficient oil pressure to close the protection control valve, so that the protection branch opens, and the reciprocating oil circuit of the lower brake cylinder group drains oil. After that, the upper brake cylinder group and the lower brake cylinder group both return to the initial state of oil leakage and pressure loss, the upper brake cylinder group is loosened, the lower brake cylinder group is tightened, and the electrode cylinder group can operate normally through oil.

[0019] Furthermore, to improve the safety and stability of the upper brake cylinder group, reduce the risk of the upper brake cylinder group losing oil and pressure before the lower brake cylinder group, and ensure the stability and reliability of the hydraulic control system, an optimization is proposed herein, with one feasible option being provided: a first oil return control valve is provided at the connection between the upper brake cylinder group's reciprocating oil circuit and the circulating oil circuit, with the reciprocating oil circuit of the lower brake cylinder group connected to the first oil return control valve. When the lower brake cylinder group receives oil, the first oil return control valve activates and closes the upper brake cylinder group's reciprocating oil circuit to prevent oil from returning to the upper brake cylinder group. After the lower brake cylinder group has completed oil return, the first oil return control valve activates and opens the upper brake cylinder group's reciprocating oil circuit to allow oil to return to the upper brake cylinder group. With this solution, the first oil return control valve controls oil leakage from the upper brake cylinder group's reciprocating oil circuit, improving the safety and reliability of the hydraulic control system.

[0020] Furthermore, a logic control oil circuit is provided between the upper and lower brake cylinder groups, ensuring that the lower brake cylinder group can only begin to operate after the upper brake cylinder group has actuated to a certain degree. This logic control oil circuit is referred to as the first control branch. While the specific structure is not strictly limited, an optimization is provided herein, citing one feasible option: a first control check valve is provided in the reciprocating oil circuit of the lower brake cylinder group. The first control branch connects to the first control check valve, and a first relief valve is provided on the first control branch. When the internal pressure of the first accumulator reaches a set value, the first relief valve opens, and the first control branch opens the first control check valve, thereby connecting the reciprocating oil circuit of the lower brake cylinder group. With this solution, if the first relief valve does not overflow, the first control check valve remains closed, preventing oil from flowing through the reciprocating oil circuit of the lower brake cylinder group, and the lower brake cylinder group remains in a leaked, locked state.

[0021] Furthermore, a logic control oil circuit is provided between the upper brake cylinder group, the lower brake cylinder group and the electrode cylinder group, so that the electrode cylinder group cannot move when the upper brake cylinder group is clamped at the same time. The logic control oil circuit here is the second control branch and the third control branch. The specific setting structure is not limited to a unique one. Here, optimization is carried out and one of the feasible options is given: a linkage control valve is provided on the reciprocating oil circuit of the electrode cylinder group. Under normal circumstances and when the second control branch is oiled, the linkage control valve is located in the first working position and connected to the reciprocating oil circuit of the electrode cylinder group; when the upper brake cylinder group is oiled and actuated, the linkage control valve is located in the second working position through the third control branch and the reciprocating oil circuit of the electrode cylinder is blocked. When such a solution is adopted, the upper brake cylinder group and the lower brake cylinder group receive oil or leak oil at the same time, and there is no simultaneous tightening. The interlocking control valve is opened to allow the electrode cylinder group to pass oil; when the upper brake cylinder group receives oil and the lower brake cylinder group leaks oil, they are tightened at the same time. At this time, the interlocking control valve is closed, and the electrode cylinder group cannot pass oil to avoid damage to the electrode; under normal circumstances, there is no working condition where the lower brake cylinder group receives oil and leaks oil, so the action of the electrode under this working condition is not considered; even if the upper brake cylinder group leaks oil and the lower brake cylinder group receives oil under abnormal conditions, the lower brake cylinder group will be drained oil after timely intervention of the protection branch, to avoid the situation where the upper and lower brake cylinder groups are loosened at the same time.

[0022] To further enhance the reliability of the coordinated control between the second and third control branches, particularly ensuring the coordinated control valve can smoothly switch to the first operating position when both the upper and lower brake cylinder groups are energized simultaneously, an optimization is proposed, offering a feasible option: installing a pressure reducing valve on the third control branch. With this solution, by properly setting the pressure reducing valve's output pressure, the coordinated action of the second control branch and the coordinated control valve's own structure allows the valve to be reset to the first operating position.

[0023] Furthermore, in logic control, taking into account certain control sequences and hysteresis, the oil circuits for the first and second accumulators are optimized. A feasible option is proposed: a first sequence valve and a second sequence valve are installed on the inlet and outlet oil pipelines of the first and second accumulators, respectively. The reciprocating oil circuit of the upper brake cylinder group is connected to the first sequence valve, which opens when the reciprocating oil circuit of the upper brake cylinder group reaches a set pressure; the reciprocating oil circuit of the lower brake cylinder group is connected to the second sequence valve, which opens when the reciprocating oil circuit of the lower brake cylinder group reaches a set pressure. This solution allows the conditions for starting energy storage in the first and second accumulators to be set, improving the control flexibility of the hydraulic control system.

[0024] Furthermore, to enhance controllability of the control branches behind the first and second accumulators and prevent premature engagement of the lower brake cylinder group and the linked control valve, an optimization is proposed, offering a feasible alternative: A first relief valve and a second relief valve are provided in the first and second control branches, respectively. With this solution, the lower brake cylinder group will only engage when the pressure in the first accumulator reaches the relief pressure of the first relief valve; and the linked control valve will only activate to its first operating position when the pressure in the second accumulator reaches the relief pressure of the second relief valve.

[0025] Furthermore, to enhance the control flexibility of the piping within the hydraulic control system, an optimization and feasible option is proposed: throttle valves are installed on the reciprocating oil circuit of the upper brake cylinder group, the reciprocating oil circuit of the lower brake cylinder group, the reciprocating oil circuit of the electrode cylinder group, the oil inlet of the first accumulator, and the oil inlet of the second accumulator. This solution allows the flow rate of each oil circuit to be adjusted according to system requirements, thereby enhancing system control flexibility.

[0026] Furthermore, the oil circuits of the upper brake cylinder group, the lower brake cylinder group, and the electrode cylinder group are all controlled by a master control structure. While the specific structure is not strictly limited, an optimization is provided herein, citing one feasible option: the reciprocating oil circuits of the upper brake cylinder group, the lower brake cylinder group, and the electrode cylinder group are each equipped with a control throttling assembly, comprising a solenoid control valve and a throttle valve connected in series. In this solution, an oil inlet and an oil drain line connect the circulating oil circuit to the solenoid control valve, with the solenoid control valve switching the connection between the oil inlet and oil drain lines.

[0027] The above discloses the composition of the electrode hydraulic control system. The present invention also discloses a method for performing hydraulic control using the electrode hydraulic control system, which is now described:

[0028] A method for controlling the hydraulic pressure of electrodes of a submerged arc furnace, using the control system disclosed in the foregoing, comprises:

[0029] In the initial state, the reciprocating oil circuit of the upper brake cylinder group is connected and the upper brake cylinder group is depressurized and loosened, the reciprocating oil circuit of the lower brake cylinder group is blocked by the first control branch and the lower brake cylinder group is depressurized and tightened, and the linkage control valve is in the first working position to connect the reciprocating oil circuit of the electrode cylinder group and enable oil flow;

[0030] The reciprocating oil circuit of the upper brake cylinder group is opened and the upper brake cylinder group is oiled to tighten. When the reciprocating oil circuit of the upper brake cylinder group reaches the set pressure, the first accumulator starts to store energy. At the same time, the third control branch switches the linkage control valve to the second working position to block the reciprocating oil circuit of the electrode cylinder group and stop the oil flow.

[0031] When the first accumulator reaches the set pressure, the first control branch connects the reciprocating oil circuit of the lower brake cylinder group, allowing oil to flow to the lower brake cylinder group and release the brake. At the same time, the reciprocating oil circuit of the upper brake cylinder group is blocked, preventing the upper brake from releasing pressure. When the reciprocating oil circuit of the lower brake cylinder group reaches the set pressure, the second accumulator begins to store energy. When the pressure of the second accumulator reaches the set value, the second control branch resets the linkage control valve to the first working position, connecting the reciprocating oil circuit of the upper brake cylinder group and resuming oil flow.

[0032] When the lower brake cylinder group is depressurized and tightened, the second accumulator is depressurized synchronously, and the second control branch and the third control branch are linked to switch the linkage control valve to the second working position to block the reciprocating oil circuit of the electrode cylinder, and the electrode cylinder stops oil flow;

[0033] After the lower brake cylinder group is depressurized, the upper brake cylinder group is depressurized and released, the first accumulator is depressurized synchronously, the first control branch is linked to block the reciprocating oil circuit of the lower brake assembly, and at the same time the third control branch loses pressure to restore the linkage control valve to the first working position, and the electrode cylinder resumes oil flow.

[0034] The hydraulic control method disclosed above can form a logical feedback control between the upper brake cylinder group and the lower brake cylinder group, avoiding the situation where the electrode cylinder continues to operate and is damaged after the upper brake cylinder group and the lower brake cylinder group are simultaneously clamped.

[0035] Furthermore, during the oil supply action of the upper brake cylinder group, the first accumulator is controlled by the first sequence valve to start storing energy; during the oil supply action of the lower brake cylinder group, the second accumulator is controlled by the second sequence valve to start storing energy.

[0036] Furthermore, to prevent the electrodes from falling due to simultaneous release of the upper and lower brake cylinder groups, an optimization option is proposed: when the lower brake cylinder group is activated, the first oil return control valve is actuated to close, blocking the connection between the reciprocating oil circuit of the upper brake cylinder group and the circulating oil circuit. When the lower brake cylinder group has finished draining oil, the first oil return control valve is reset and opened. With this solution, the reciprocating oil circuit of the lower brake cylinder group is used to block and control the reciprocating oil circuit of the upper brake cylinder group, preventing the reciprocating oil circuit of the upper brake cylinder group from draining oil first.

[0037] Furthermore, to improve the reliability of the hydraulic control method, a remedial measure is proposed for the event that the upper brake cylinder group's reciprocating oil circuit loses pressure first under abnormal circumstances. An optimization is proposed, with one feasible option being presented: when the upper brake cylinder group loses pressure due to oil leakage, the protection branch is connected via the fourth control branch to control the lower brake cylinder group to drain and tighten. With this solution, if the upper brake cylinder group's reciprocating oil circuit loses pressure first, the fourth control branch will remedy the situation, causing the lower brake cylinder group's reciprocating oil circuit to drain and tighten, preventing the electrode from falling.

[0038] Compared with the prior art, some of the beneficial effects of the technical solution disclosed in the present invention include:

[0039] The hydraulic control system and hydraulic control method provided by the present invention can achieve coordinated control of the upper brake cylinder group, lower brake cylinder group, and electrode cylinder group of an electric arc furnace. During the hydraulic control of the three components, damage to the electrodes caused by simultaneously tightening the upper and lower brakes can be avoided, as can the electrodes falling due to simultaneous release of the upper and lower brakes. The operating logic and feedback control of the entire hydraulic system are more clear, and operation can be achieved through remote control and PLC control, ensuring normal and stable operation of the hydraulic system even under manual operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only represent some embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0041] Figure 1 Schematic diagram of the composition structure of the hydraulic control system.

[0042] Figure 2 This is a schematic diagram of the linkage control of the hydraulic control system's oil supply process.

[0043] Figure 3 Schematic diagram of linkage control of the oil leakage process of the hydraulic control system.

[0044] Figure 4 This is a schematic diagram of the remedial process after the brake cylinder group on the hydraulic control system loses oil pressure.

[0045] In the above drawings, the meanings of the various reference numerals are as follows:

[0046] 1. Upper brake cylinder group; 2. Lower brake cylinder group; 3. Electrode cylinder group; 4. Circulating oil circuit; 401. Oil supply pipeline; 402. Oil return pipeline; 5. First control branch; 6. Third control branch; 7. Second control branch; 8. Protection branch; 9. First return oil control valve; 10. Solenoid control valve; 11. Throttle valve; 12. First control check valve; 13. Protection control valve; 14. First sequence valve; 15. First accumulator; 16. First relief valve; 17. Second sequence valve; 18. Second accumulator; 19. Second relief valve; 20. Linkage control valve; 21. Pressure reducing valve. DETAILED DESCRIPTION

[0047] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0048] In view of the poor control stability of the existing hydraulic control system of the electrode of the electric arc furnace, the electrode cylinder may continue to operate after the upper and lower brakes are tightened, causing damage to the electrode, or the upper and lower brakes may be loosened at the same time, causing the electrode to fall. At the same time, manual operation cannot guarantee the reliability of the system. The following embodiments are optimized and overcome the defects in the existing technology.

[0049] Example 1

[0050] like Figure 1 As shown, this embodiment provides an electrode hydraulic control system for a submerged arc furnace, aiming to improve the stability and reliability of the hydraulic control system and avoid damage caused by control errors.

[0051] Specifically, as disclosed in this embodiment, the electrode hydraulic control system has one structure including:

[0052] A circulating oil circuit 4 for providing hydraulic oil is connected to the cylinder assemblies through a plurality of reciprocating oil circuits; the cylinder assemblies are actuated by oil from the circulating oil circuit 4 through the reciprocating oil circuits, and return oil to the circulating oil circuit 4 for reset; the cylinder assemblies include an upper brake cylinder group 1 for driving the upper brake action, a lower brake cylinder group 2 for driving the lower brake action, and an electrode cylinder group 3 for driving the electrode action.

[0053] Preferably, the circulating oil circuit 4 includes an oil delivery pipeline 401 and an oil return pipeline 402, which are connected to the oil supply system to meet the hydraulic oil demand of the entire hydraulic control system.

[0054] In this embodiment, the upper brake cylinder group 1, the lower brake cylinder group 2 and the electrode cylinder group 3 are respectively connected to the circulating oil circuit 4 through a reciprocating oil circuit. The front end of the reciprocating oil circuit forms an oil inlet pipeline and an oil drain pipeline, and is respectively connected to the oil supply pipeline 401 and the oil return pipeline 402.

[0055] Preferably, in this embodiment, the oil circuits of the upper brake cylinder group 1, the lower brake cylinder group 2, and the electrode cylinder group 3 are all controlled by a master control structure. The specific structure is not limited to a single one. Here, an optimization is performed and one feasible option is adopted: the reciprocating oil circuits of the upper brake cylinder group 1, the reciprocating oil circuits of the lower brake cylinder group 2, and the reciprocating oil circuits of the electrode cylinder group 3 are all provided with a control throttling assembly, which includes a solenoid control valve 10 and a throttle valve 11 connected in series. When adopting this solution, an oil inlet line and an oil drain line are connected between the circulating oil circuit 4 and the solenoid control valve 10, and the connection relationship between the oil inlet line and the oil drain line is switched by the solenoid control valve 10.

[0056] Preferably, the electromagnetic control valves 10 for the upper brake cylinder group 1 and the lower brake cylinder group 2 are two-position, three-way electrode valves. In the first position, they connect to the oil discharge line and drain oil; in the second position, they connect to the oil supply line and receive oil. The electromagnetic control valve 10 for the electrode cylinder group 3 is a three-position, four-way valve. In the first position, they connect to the oil discharge line and drain oil; in the second position, they disconnect all oil lines; and in the third position, they connect to the oil supply line and receive oil.

[0057] To enhance the control flexibility of the pipelines within the hydraulic control system, this embodiment optimizes and adopts a feasible option: throttle valves 11 are installed in the reciprocating oil circuit of the upper brake cylinder group 1, the reciprocating oil circuit of the lower brake cylinder group 2, the reciprocating oil circuit of the electrode cylinder group, the oil inlet of the first accumulator 15, and the oil inlet of the second accumulator 18. This solution allows the flow rate of each oil circuit to be adjusted according to system requirements, thereby improving system control flexibility.

[0058] The second structure of the electrode hydraulic control system disclosed in this embodiment includes:

[0059] The first accumulator 15 is used for logical control between the upper brake cylinder group 1 and the lower brake cylinder group 2. Its inlet and outlet oil pipelines are connected to the reciprocating oil circuit of the upper brake cylinder group 1 and energy is stored in the process of the upper brake cylinder group 1 receiving oil, and energy is discharged in the process of the upper brake cylinder group 1 returning oil; the first accumulator 15 is connected to the reciprocating oil circuit of the lower brake cylinder group 2 through the first control branch 5, and is used to open the reciprocating oil circuit of the lower brake cylinder group 2 after the first accumulator 15 reaches the set pressure, otherwise it remains closed.

[0060] In this embodiment, since a logic control oil circuit is provided between the upper brake cylinder group 1 and the lower brake cylinder group 2, the lower brake cylinder group 2 can only start to move after the upper brake cylinder group 1 moves to a certain extent. The logic control oil circuit is the first control branch 5. The specific structure is not limited to a unique one. This embodiment is optimized and adopts one of the feasible options: a first control one-way valve 12 is provided on the reciprocating oil circuit of the lower brake cylinder group 2, and the first control branch 5 is connected to the first control one-way valve 12 and a first overflow valve 16 is provided on the first control branch 5. When the internal pressure of the first accumulator 15 reaches the set value, the first overflow valve 16 opens, and the first control branch 5 causes the first control one-way valve 12 to open, thereby connecting the reciprocating oil circuit of the lower brake cylinder group 2. When such a solution is adopted, if the first relief valve 16 does not overflow, the first control one-way valve 12 is always closed, the reciprocating oil path of the lower brake cylinder group 2 cannot pass oil, and the lower brake cylinder group 2 always maintains the oil leakage and tightening state.

[0061] The third structure of the electrode hydraulic control system disclosed in this embodiment includes:

[0062] The second accumulator 18 is used for logical control between the lower brake cylinder group 2 and the electrode cylinder group 3. Its inlet and outlet oil pipelines are connected to the reciprocating oil circuit of the lower brake cylinder group 2 and energy is stored in the process of the lower brake cylinder group 2 receiving oil, and energy is discharged in the process of the lower brake cylinder group 2 returning oil; the second accumulator 18 is connected to the reciprocating oil circuit of the electrode cylinder group through the second control branch 7, and is used to open the reciprocating oil circuit of the electrode cylinder after the second accumulator 18 reaches the set pressure, otherwise it remains closed.

[0063] Preferably, in logic control, taking into account certain control sequences and hysteresis, this embodiment optimizes the oil circuits for the first and second accumulators 15, 18. A feasible option is employed: a first sequence valve 14 and a second sequence valve 17 are respectively provided on the inlet and outlet oil pipelines of the first and second accumulators 15, 18. The reciprocating oil circuit of the upper brake cylinder group 1 is connected to the first sequence valve 14, which opens when the reciprocating oil circuit of the upper brake cylinder group 1 reaches a set pressure; the reciprocating oil circuit of the lower brake cylinder group 2 is connected to the second sequence valve 17, which opens when the reciprocating oil circuit of the lower brake cylinder group 2 reaches a set pressure. This solution allows for the conditions for starting energy storage in the first and second accumulators 15, 18 to be set, thereby increasing the control flexibility of the hydraulic control system.

[0064] To enhance controllability of the control branch following the first accumulator 15 and the second accumulator 18 and prevent premature engagement of the lower holding brake cylinder group 2 and the linkage control valve 20, this embodiment optimizes and adopts a feasible option: a first relief valve 16 and a second relief valve 19 are respectively provided on the first control branch 5 and the second control branch 7. With this solution, the lower holding brake cylinder group 2 will only engage when the pressure in the first accumulator 15 reaches the relief pressure of the first relief valve 16; and the linkage control valve 20 will only activate to its first operating position when the pressure in the second accumulator 18 reaches the relief pressure of the second relief valve 19.

[0065] The fourth structure of the electrode hydraulic control system disclosed in this embodiment includes:

[0066] The third control branch 6, which is used to cooperate with the second control branch 7 for linkage control, extends from the reciprocating oil circuit of the upper brake cylinder group 1 to the reciprocating oil circuit of the electrode cylinder group 3, and is used to block the reciprocating oil circuit of the electrode cylinder group 3 when the reciprocating oil circuit of the upper brake cylinder receives oil; the third control branch 6 and the second control branch 7 work together to control the on and off of the reciprocating oil circuit of the electrode cylinder group 3.

[0067] In this embodiment, a logic control oil circuit is provided between the upper brake cylinder group 1, the lower brake cylinder group 2 and the electrode cylinder group 3, so that the electrode cylinder group 3 cannot move when the upper brake cylinder group 1 is tightened at the same time. The logic control oil circuit here is the second control branch 7 and the third control branch 6. The specific setting structure is not limited to a unique one. Here, optimization is performed and one of the feasible options is adopted: a linkage control valve 20 is provided on the reciprocating oil circuit of the electrode cylinder group 3. Under normal circumstances and when the second control branch 7 is oiled, the linkage control valve 20 is located in the first working position and connected to the reciprocating oil circuit of the electrode cylinder group 3; when the upper brake cylinder group 1 is oiled and actuated, the linkage control valve 20 is located in the second working position through the third control branch 6 and blocks the reciprocating oil circuit of the electrode cylinder. When such a solution is adopted, the upper brake cylinder group 1 and the lower brake cylinder group 2 receive oil or leak oil at the same time, and there is no simultaneous tightening. The interlocking control valve 20 is opened to allow the electrode cylinder group 3 to pass oil; when the upper brake cylinder group 1 receives oil and the lower brake cylinder group 2 leaks oil, they are tightened at the same time. At this time, the interlocking control valve 20 is closed, and the electrode cylinder group 3 cannot pass oil to avoid damage to the electrode; and under normal circumstances, there is no working condition where the lower brake cylinder group 2 receives oil and leaks oil, so the action of the electrode under this working condition is not considered; even if the upper brake cylinder group 1 leaks oil and the lower brake cylinder group 2 receives oil under abnormal working conditions, the lower brake cylinder group 2 will be drained oil after the timely intervention of the protection branch 8, avoiding the situation where the upper brake cylinder group 1 and the lower brake cylinder group 2 are loosened at the same time.

[0068] To improve the reliability of the coordinated control between the second control branch 7 and the third control branch 6, and particularly to ensure that the coordinated control valve 20 can smoothly switch to the first operating position when both the upper brake cylinder group 1 and the lower brake cylinder group 2 are simultaneously receiving oil, an optimization and feasible option is employed: a pressure reducing valve 21 is provided on the third control branch 6. With this solution, by properly setting the output pressure of the pressure reducing valve 21, the coordinated action of the second control branch 7 and the coordinated control valve 20 itself can reset the valve to the first operating position.

[0069] The hydraulic control system disclosed in this embodiment is equipped with a first control branch 5, a second control branch 7 and a third control branch 6 between the upper brake cylinder group 1, the lower brake cylinder group 2 and the electrode cylinder group 3. During the operation of the upper brake cylinder group 1 and the lower brake cylinder group 2, the operation of the electrode cylinder group 3 is restricted to protect the electrode cylinder group 3, so that the operation logic of the hydraulic control system is clearer and controllable. Regardless of whether it is controlled by remote computer, PLC or on-site manual operation, it can effectively ensure the stable operation of the hydraulic control system and avoid system failure or operation damage.

[0070] Example 2

[0071] like Figure 1 As shown, this embodiment improves the solution based on embodiment 1 to improve the safety of the hydraulic control system, avoid the situation where the upper brake and the lower brake are released at the same time, and provide a remedial solution when this situation occurs.

[0072] Specifically, in this embodiment, in order to avoid the situation where the upper brake cylinder and the lower brake cylinder are loosened at the same time and the electrode falls off, the reciprocating oil circuits of the upper brake cylinder group 1 and the lower brake cylinder group 2 are adjusted and optimized. This embodiment optimizes and adopts one of the feasible options: the lower brake cylinder group 2 is provided with a protection branch 8, one end of the protection branch 8 is connected to the reciprocating oil circuit of the lower brake cylinder group 2 and the inlet and outlet oil circuits of the second accumulator 18, and the other end extends and is connected to the circulating oil circuit 4 for oil return; a protection control valve 13 is provided on the protection branch 8, and a fourth control branch is provided on the reciprocating oil circuit of the upper brake cylinder group 1 and is connected to the protection control valve 13. When the reciprocating oil circuit of the upper brake cylinder group 1 is oiled, the fourth control branch closes the protection control valve 13. When the reciprocating oil circuit of the upper brake cylinder group 1 loses oil pressure due to oil leakage, the fourth control branch opens the protection control valve 13 to drain the reciprocating oil circuit of the lower brake cylinder group 2. When such a solution is adopted, the oil pressure in the reciprocating oil circuit of the upper brake cylinder group 1 is used to control the closure of the protection control valve 13. Under normal circumstances, the protection branch 8 is in a blocked state, and the reciprocating oil circuit of the lower brake cylinder group 2 cannot drain oil from the protection branch 8; when some abnormal conditions occur and cause the upper brake cylinder group 1 to drain oil and lose pressure before the lower brake cylinder group 2, the fourth control branch cannot provide sufficient oil pressure to close the protection control valve 13, so that the protection branch 8 opens, and the reciprocating oil circuit of the lower brake cylinder group 2 drains oil. After that, the upper brake cylinder group 1 and the lower brake cylinder group 2 both return to the initial state of oil leakage and pressure loss, the upper brake cylinder group 1 is loosened, the lower brake cylinder group 2 is tightened, and the electrode cylinder group 3 can operate normally through oil.

[0073] Preferably, to improve the safety and stability of the upper brake cylinder group 1, reduce the possibility of the upper brake cylinder group 1 losing oil and pressure before the lower brake cylinder group 2, and ensure the stability and reliability of the hydraulic control system, an optimization is performed and one of the feasible options is adopted: a first oil return control valve 9 is provided at the portion where the reciprocating oil circuit of the upper brake cylinder group 1 connects to the circulating oil circuit 4, and the reciprocating oil circuit of the lower brake cylinder group 2 is connected to the first oil return control valve 9; when the lower brake cylinder group 2 receives oil, the first oil return control valve 9 activates and closes the reciprocating oil circuit of the upper brake cylinder group 1 to prevent the upper brake cylinder group 1 from returning oil; after the lower brake cylinder group 2 has completed oil return, the first oil return control valve 9 activates and opens the reciprocating oil circuit of the upper brake cylinder group 1 to allow the upper brake cylinder group 1 to return oil. When this solution is adopted, the first oil return control valve 9 controls the oil leakage of the reciprocating oil circuit of the upper brake cylinder group 1, improving the safety and reliability of the hydraulic control system.

[0074] Example 3

[0075] The above-mentioned embodiments 1 and 2 disclose the composition of the electrode hydraulic control system. This embodiment discloses a method for performing hydraulic control by using the electrode hydraulic control system in the above-mentioned embodiments, which will now be described.

[0076] like Figures 2 to 4 As shown, a method for controlling the hydraulic pressure of an electrode of a submerged arc furnace, applying the control system disclosed in the aforementioned embodiment, comprises:

[0077] In the initial state, the reciprocating oil circuit of the upper brake cylinder group 1 is connected and the upper brake cylinder group 1 is depressurized and loosened, the reciprocating oil circuit of the lower brake cylinder group 2 is blocked by the first control branch 5 and the lower brake cylinder group 2 is depressurized and tightened, and the linkage control valve 20 is in the first working position to connect the reciprocating oil circuit of the electrode cylinder group 3 and enable oil flow;

[0078] The reciprocating oil circuit of the upper brake cylinder group 1 is opened and the upper brake cylinder group 1 is oiled to tighten. When the reciprocating oil circuit of the upper brake cylinder group 1 reaches the set pressure, the first accumulator 15 starts to store energy. At the same time, the third control branch 6 switches the linkage control valve 20 to the second working position, so that the reciprocating oil circuit of the electrode cylinder group 3 is blocked and the oil flow action is stopped.

[0079] When the first accumulator 15 reaches the set pressure value, the first control branch 5 connects the reciprocating oil circuit of the lower brake cylinder group 2 and releases the oil of the lower brake cylinder group 2. When the reciprocating oil circuit of the lower brake cylinder group 2 reaches the set pressure, the second accumulator 18 starts to store energy. When the pressure of the second accumulator 18 reaches the set value, the second control branch 7 resets the linkage control valve 20 to the first working position to connect the reciprocating oil circuit of the electrode cylinder group 3 and resume the oil flow action.

[0080] When the lower brake cylinder group 2 is depressurized and tightened, the second accumulator 18 is depressurized simultaneously, and the second control branch 7 and the third control branch 6 are linked to switch the linkage control valve 20 to the second working position to block the reciprocating oil circuit of the electrode cylinder, and the electrode cylinder stops oil flow;

[0081] After the lower brake cylinder group 2 is depressurized, the upper brake cylinder group 1 is depressurized and released, the first accumulator 15 is depressurized synchronously, the first control branch 5 is linked to block the reciprocating oil circuit of the lower brake assembly, and at the same time the third control branch 6 loses pressure to restore the linkage control valve 20 to the first working position, and the electrode cylinder resumes oil flow.

[0082] In this embodiment, during the oil supply action of the upper brake cylinder group 1, the first accumulator 15 is controlled by the first sequence valve 14 to start storing energy; during the oil supply action of the lower brake cylinder group 2, the second accumulator 18 is controlled by the second sequence valve 17 to start storing energy.

[0083] In this embodiment, to prevent the electrodes from falling due to the simultaneous release of the upper and lower brake cylinder groups 1 and 2, an optimization is implemented using a feasible option: when the lower brake cylinder group 2 is activated, the first oil return control valve 9 is driven to close, blocking the connection between the reciprocating oil circuit of the upper brake cylinder group 1 and the circulating oil circuit 4. When the lower brake cylinder group 2 has finished draining oil, the first oil return control valve 9 is reset and opened. With this solution, the reciprocating oil circuit of the lower brake cylinder group 2 blocks the reciprocating oil circuit of the upper brake cylinder group 1, preventing the reciprocating oil circuit of the upper brake cylinder group 1 from draining oil first.

[0084] To improve the reliability of the hydraulic control method and provide remedial measures in the event that the reciprocating oil circuit of the upper brake cylinder group 1 experiences a preemptive depressurization under abnormal circumstances, this embodiment optimizes and employs a feasible option: when the upper brake cylinder group 1 experiences a loss of pressure due to oil leakage, the fourth control branch connects the protective branch 8 to control the lower brake cylinder group 2 to drain and tighten. With this solution, when the reciprocating oil circuit of the upper brake cylinder group 1 experiences a preemptive depressurization, the reciprocating oil circuit of the lower brake cylinder group 2, under the remedy of the fourth control branch, drains and tightens, preventing the electrode from falling.

[0085] The hydraulic control method disclosed in this embodiment can form a logical feedback control between the upper brake cylinder group 1 and the lower brake cylinder group 2, thereby avoiding the situation where the electrode cylinder continues to operate after the upper brake cylinder group 1 and the lower brake cylinder group 2 are simultaneously clamped, causing damage.

[0086] The above are the implementation methods listed in this embodiment, but this embodiment is not limited to the above optional implementation methods. Those skilled in the art can arbitrarily combine the above methods to obtain other various implementation methods. Anyone can derive other various implementation methods based on the inspiration of this embodiment. The above specific implementation methods should not be understood as limiting the scope of protection of this embodiment. The scope of protection of this embodiment should be based on the definition in the claims.

Claims

1. An electrode hydraulic control system for a submerged arc furnace, characterized in that: include: The circulating oil circuit (4) is connected to the oil cylinder assembly through a plurality of reciprocating oil circuits; the oil cylinder assembly is actuated by oil from the circulating oil circuit (4) through the reciprocating oil circuit, and is reset by oil returned to the circulating oil circuit (4); the oil cylinder assembly comprises an upper brake oil cylinder group (1) for driving the upper brake action, a lower brake oil cylinder group (2) for driving the lower brake action, and an electrode oil cylinder group (3) for driving the electrode action; The first accumulator (15) has an oil inlet and outlet pipeline connected to the reciprocating oil circuit of the upper brake oil cylinder group (1) and stores energy when the upper brake oil cylinder group (1) receives oil, and releases energy when the upper brake oil cylinder group (1) returns oil; the first accumulator (15) is connected to the reciprocating oil circuit of the lower brake oil cylinder group (2) through the first control branch (5), and is used to open the reciprocating oil circuit of the lower brake oil cylinder group (2) after the first accumulator (15) reaches a set pressure, otherwise it remains closed; The second accumulator (18) has an oil inlet and outlet pipeline connected to the reciprocating oil circuit of the lower brake cylinder group (2) and stores energy when the lower brake cylinder group (2) receives oil, and releases energy when the lower brake cylinder group (2) returns oil; the second accumulator (18) is connected to the reciprocating oil circuit of the electrode cylinder group through the second control branch (7), and is used to open the reciprocating oil circuit of the electrode cylinder after the second accumulator (18) reaches a set pressure, otherwise it remains closed; The third control branch (6) extends from the reciprocating oil circuit of the upper brake cylinder group (1) to the reciprocating oil circuit of the electrode cylinder group (3) and is used to block the reciprocating oil circuit of the electrode cylinder group (3) when the reciprocating oil circuit of the upper brake cylinder receives oil; the third control branch (6) and the second control branch (7) work together to control the on-off of the reciprocating oil circuit of the electrode cylinder group (3); The lower brake cylinder group (2) is provided with a protection branch (8), one end of the protection branch (8) is connected to the reciprocating oil circuit of the lower brake cylinder group (2) and the inlet and outlet oil circuits of the second accumulator (18), and the other end extends and is connected to the circulating oil circuit (4) for oil return; a protection control valve (13) is provided on the protection branch (8), and a fourth control branch is provided on the reciprocating oil circuit of the upper brake cylinder group (1) and is connected to the protection control valve (13); when the reciprocating oil circuit of the upper brake cylinder group (1) is oiled, the fourth control branch closes the protection control valve (13); when the reciprocating oil circuit of the upper brake cylinder group (1) is depressurized due to oil leakage, the fourth control branch opens the protection control valve (13) to drain the reciprocating oil circuit of the lower brake cylinder group (2); The portion where the reciprocating oil circuit of the upper brake cylinder group (1) is connected to the circulating oil circuit (4) is provided with a first oil return control valve (9); A linkage control valve (20) is provided on the reciprocating oil circuit of the electrode oil cylinder group (3); A first sequence valve (14) and a second sequence valve (17) are respectively provided on the oil inlet and outlet pipelines of the first accumulator (15) and the second accumulator (18).

2. The electrode hydraulic control system of the submerged arc furnace according to claim 1, characterized in that: The reciprocating oil circuit of the lower brake oil cylinder group (2) is connected to the first oil return control valve (9); when the lower brake oil cylinder group (2) receives oil, the first oil return control valve (9) operates and closes the reciprocating oil circuit of the upper brake oil cylinder group (1) to prevent the upper brake oil cylinder group (1) from returning oil; after the lower brake oil cylinder group (2) has completed oil return, the first oil return control valve (9) operates and opens the reciprocating oil circuit of the upper brake oil cylinder group (1) to allow the upper brake oil cylinder group (1) to return oil.

3. The electrode hydraulic control system of a submerged arc furnace according to claim 1, characterized in that: A first control one-way valve (12) is provided on the reciprocating oil circuit of the lower brake cylinder group (2), the first control branch (5) is connected to the first control one-way valve (12) and a first overflow valve (16) is provided on the first control branch (5), when the internal pressure of the first accumulator (15) reaches a set value, the first overflow valve (16) opens, and the first control branch (5) opens the first control one-way valve (12) so that the reciprocating oil circuit of the lower brake cylinder group (2) is connected.

4. The electrode hydraulic control system of a submerged arc furnace according to claim 1, characterized in that: Under normal conditions and when the second control branch (7) is oiled, the linkage control valve (20) is located in the first working position and is connected to the reciprocating oil path of the electrode oil cylinder group (3); when the upper brake oil cylinder group (1) is oiled, the linkage control valve (20) is located in the second working position through the third control branch (6) and blocks the reciprocating oil path of the electrode oil cylinder.

5. The electrode hydraulic control system of the submerged arc furnace according to claim 4, characterized in that: The third control branch (6) is provided with a pressure reducing valve (21).

6. The electrode hydraulic control system of a submerged arc furnace according to claim 1, characterized in that: The reciprocating oil circuit of the upper brake cylinder group (1) is connected to the first sequence valve (14) and is used to open the first sequence valve (14) when the reciprocating oil circuit of the upper brake cylinder group (1) reaches a set pressure; the reciprocating oil circuit of the lower brake cylinder group (2) is connected to the second sequence valve (17) and is used to open the second sequence valve (17) when the reciprocating oil circuit of the lower brake cylinder group (2) reaches a set pressure.

7. The electrode hydraulic control system of a submerged arc furnace according to claim 1, characterized in that: A throttle valve (11) is provided on the reciprocating oil circuit of the upper brake cylinder group (1), and / or the reciprocating oil circuit of the lower brake cylinder group (2), and / or the reciprocating oil circuit of the electrode cylinder group, and / or the oil inlet end of the first accumulator (15), and / or the oil inlet end of the second accumulator (18).

8. The electrode hydraulic control system of a submerged arc furnace according to claim 1, characterized in that: The first control branch (5) and the second control branch (7) are respectively provided with a first overflow valve (16) and a second overflow valve (19).

9. The electrode hydraulic control system of a submerged arc furnace according to claim 1, characterized in that: The reciprocating oil circuit of the upper brake cylinder group (1), the reciprocating oil circuit of the lower brake cylinder group (2), and the reciprocating oil circuit of the electrode cylinder group (3) are all provided with a control throttling assembly, and the control throttling assembly includes an electromagnetic control valve (10) and a throttle valve (11) connected in series.

10. A method for controlling the hydraulic pressure of electrodes of a submerged arc furnace, using the control system according to any one of claims 1 to 9, characterized in that: include: In the initial state, the reciprocating oil circuit of the upper brake cylinder group (1) is connected and the upper brake cylinder group (1) is depressurized and loosened, the reciprocating oil circuit of the lower brake cylinder group (2) is blocked by the first control branch (5) and the lower brake cylinder group (2) is depressurized and tightened, and the linkage control valve (20) is located in the first working position so that the reciprocating oil circuit of the electrode cylinder group (3) is connected and can operate through oil; The reciprocating oil circuit of the upper brake cylinder group (1) is opened and the upper brake cylinder group (1) is activated to receive oil to tighten. After the reciprocating oil circuit of the upper brake cylinder group (1) reaches the set pressure, the first accumulator (15) starts to store energy. At the same time, the third control branch (6) switches the linkage control valve (20) to the second working position so that the reciprocating oil circuit of the electrode cylinder group (3) is blocked and the oil flow action is stopped. When the first accumulator (15) reaches a set pressure value, the first control branch (5) connects the reciprocating oil circuit of the lower brake cylinder group (2) and releases the oil of the lower brake cylinder group (2). When the reciprocating oil circuit of the lower brake cylinder group (2) reaches the set pressure, the second accumulator (18) starts to store energy. When the pressure of the second accumulator (18) reaches the set value, the second control branch (7) resets the linkage control valve (20) to the first working position to connect the reciprocating oil circuit of the electrode cylinder group (3) and resume the oil flow action. When the lower brake cylinder group (2) is depressurized and tightened, the second accumulator (18) is depressurized synchronously, and the second control branch (7) and the third control branch (6) are linked to switch the linkage control valve (20) to the second working position to block the reciprocating oil circuit of the electrode cylinder, and the electrode cylinder stops the oil flow action; After the lower brake cylinder group (2) is depressurized, the upper brake cylinder group (1) is depressurized and released, the first accumulator (15) is depressurized synchronously, the first control branch (5) is linked to block the reciprocating oil circuit of the lower brake assembly, and at the same time the third control branch (6) loses pressure to restore the linkage control valve (20) to the first working position, and the electrode cylinder resumes the oil flow action.

11. The hydraulic control method according to claim 10, characterized in that: During the oil-receiving action of the upper brake cylinder group (1), the first accumulator (15) is controlled by the first sequence valve (14) to start storing energy; during the oil-receiving action of the lower brake cylinder group (2), the second accumulator (18) is controlled by the second sequence valve (17) to start storing energy.

12. The hydraulic control method according to claim 10, characterized in that: When the lower brake oil cylinder group (2) is activated by oil, the first oil return control valve (9) is driven to close to block the connection between the reciprocating oil circuit of the upper brake oil cylinder group (1) and the circulating oil circuit (4); when the lower brake oil cylinder group (2) has finished draining oil, the first oil return control valve (9) is reset and opened.

13. The hydraulic control method according to claim 10, characterized in that: When the upper brake oil cylinder group (1) loses pressure due to oil leakage, the protection branch (8) is connected through the fourth control branch to control the lower brake oil cylinder group (2) to leak oil and hold tightly.

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