CN116026161A - Electrode hydraulic control system and control method of submerged arc furnace - Google Patents

Abstract

The present invention relates to the technical field of hydraulic control of submerged arc furnaces, in particular to an electrode hydraulic control system and control method of submerged arc furnaces, comprising: a circulating oil circuit connected to oil cylinder components through several reciprocating oil circuits; a first accumulator, It is connected to the reciprocating oil circuit of the upper brake cylinder group and synchronously stores and discharges energy during the process of obtaining oil and returning oil to the upper brake cylinder group, and is used for feedback control of the reciprocating oil circuit of the lower brake cylinder group; the second The accumulator is connected to the reciprocating oil circuit of the lower brake cylinder group and synchronously stores and discharges energy during the process of getting oil and returning oil to the lower brake cylinder group, and is used for feedback control on-off of the reciprocating oil circuit of the electrode cylinder; the third The control branch works in conjunction with the second control branch to control the on-off of the reciprocating oil circuit of the electrode cylinder group. In the process of hydraulic control, the invention avoids the situation that the electrodes are damaged due to the simultaneous tightening or loosening of the upper and lower brakes, and can ensure the normal and stable operation of the hydraulic system through remote control and PLC control, that is, manual operation.

Description

Electrode hydraulic control system and control method of submerged arc furnace

technical field

The invention relates to the technical field of hydraulic control of a submerged arc furnace, in particular to an electrode hydraulic control system and a control method of a submerged arc furnace.

Background technique

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

The mechanical equipment mainly 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 controlled by hydraulic pressure.

In the hydraulic control system currently used in submerged arc furnaces, the three hydraulic systems of the upper brake, the lower brake and the electrode cylinder are independently controlled, but there are three control logics that must be paid attention to:

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;

2. When the upper and lower brakes are held tightly at the same time, if the electrode cylinder is running, the electrode will be broken, so the electrode cylinder cannot operate in this state;

3. When returning oil, the brake must be lowered and the oil should be returned first, and the oil should be returned to open after the brake is turned on.

In order to realize such a logical operation relationship, the existing hydraulic system can only be controlled logically by means of PLC programming. When the operation cannot be controlled by the computer, it is operated by manually controlling the valve. The rationality of the operation depends entirely on the professional level of the operator, and the inevitability of the mutual logical relationship during hydraulic control cannot be guaranteed, and there are certain safety hazards.

It can be seen that there is still room for improvement in the existing hydraulic control system, and its reliability is insufficient. It needs to be optimized and improved to ensure the safety and reliability of the electrode fixing, and at the same time avoid the electrode being damaged by the oil cylinder. Therefore, it is necessary to propose a more reasonable technical solution to solve the technical problems existing in the prior art.

Contents of the invention

In order to overcome at least one of the defects mentioned above, the present invention proposes an electrode hydraulic control system for a submerged arc furnace, which realizes the operation of the submerged arc furnace electrode in the process of lifting and pressing through the mutual correlation of hydraulic mechanical components. Logical control to achieve the purpose of safe production.

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

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

The circulating oil circuit is connected to the oil cylinder assembly through a number of reciprocating oil circuits; the oil cylinder assembly obtains oil from the circulating oil circuit through the reciprocating oil circuit, and returns oil to the circulating oil circuit for reset; the oil cylinder assembly includes a The upper brake cylinder group, the lower brake cylinder group used to drive the lower brake action, and the electrode cylinder group used to drive the electrode action;

The first accumulator, the oil inlet and outlet pipelines are connected to the reciprocating oil circuit of the upper brake cylinder group, and the energy is stored during the process of getting oil from the upper brake cylinder group, and the energy is released during the oil return process of the upper brake cylinder group ; The first accumulator is connected to the reciprocating oil circuit of the lower brake cylinder group through the first control branch, and is used to open the reciprocating oil circuit of the lower brake cylinder group after the first accumulator reaches the set pressure, otherwise keep closure;

The second accumulator, its oil inlet and outlet pipelines are connected to the reciprocating oil circuit of the lower brake cylinder group, and the energy is stored during the process of getting oil from the lower brake cylinder group, and the energy is released during the oil return process of the lower brake cylinder group; The second accumulator is connected to the reciprocating oil circuit of the electrode cylinder group through the second control branch, and is used to open the reciprocating oil circuit of the electrode cylinder after the second accumulator reaches the set pressure, otherwise keep it closed;

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 in conjunction with the second control branch to control the on-off of the reciprocating oil circuit of the electrode cylinder group.

In the hydraulic control system disclosed above, a first control branch, a second control branch and a third control branch are set between the upper brake cylinder group, the lower brake cylinder group and the electrode cylinder group, and the upper brake cylinder During the action of the brake group and the lower brake cylinder group, the movement of the electrode cylinder group is limited to protect the electrode cylinder group, making the action logic of the hydraulic control system clearer and controllable, no matter through remote computer control, PLC control or on-site human control. It can effectively guarantee the stable operation of the hydraulic control system and avoid system failure or operation damage.

Further, in the present invention, in order to avoid the situation that the upper brake cylinder and the lower brake cylinder are loosened at the same time and cause the electrode to drop, an optimization is performed here and one of the feasible options is given: the lower brake cylinder group A protection branch is provided, 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 circuit of the second accumulator, and the other end is extended and connected to the circulating oil circuit for oil return; the protection branch is provided with a protection control A fourth control branch is set 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 connected with oil, the fourth control branch closes the protection control valve. When the reciprocating oil circuit of the upper brake cylinder group drains oil and loses pressure, the fourth control branch makes the protection control valve open so that the reciprocating oil circuit of the lower brake cylinder group drains oil. When such a scheme is adopted, the oil pressure in the reciprocating oil circuit controls and closes the protection control valve when oil is obtained through the upper brake cylinder group. Under normal conditions, 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 cause the upper brake cylinder group to drain oil and lose pressure before the lower brake cylinder group, the fourth control branch cannot provide enough oil pressure to close the protection control valve, thus The protection branch is opened, and the reciprocating oil circuit of the lower brake cylinder group drains oil. After that, both the upper brake cylinder group and the lower brake cylinder group return to the initial state of oil discharge and pressure loss. The upper brake cylinder group is released, and the lower brake cylinder group is released. The brake oil cylinder group is tightly held, and the electrode oil cylinder group can operate normally.

Furthermore, in order to improve the safety and stability of the upper brake cylinder group, reduce the situation that the upper brake cylinder group drains oil and lose pressure before the lower brake cylinder group, and ensure the stability and reliability of the hydraulic control system, here we optimize and list the A feasible option: the part connecting the reciprocating oil circuit and the circulating oil circuit of the upper brake cylinder group is provided with a first oil return control valve, and the reciprocating oil circuit of the lower brake cylinder group is connected with the first oil return control valve ;When the lower brake oil cylinder group receives oil, the first oil return control valve acts and closes the reciprocating oil circuit of the upper brake oil cylinder group to prevent the upper brake oil cylinder group from returning oil; after the oil return of the lower brake oil cylinder group is completed, the first The oil return control valve acts and opens the reciprocating oil circuit of the upper brake cylinder group to allow the oil return of the upper brake cylinder group. When such a scheme is adopted, the first oil return control valve performs oil drain control on the reciprocating oil circuit of the upper brake oil cylinder group, which improves the safety and reliability of the hydraulic control system.

Further, a logical control oil circuit is set between the upper brake cylinder group and the lower brake cylinder group, so that the lower brake cylinder group can start to move only after the upper brake cylinder group moves to a certain extent, and the logic control oil circuit It is the first control branch, and the specific structure is not uniquely limited. Here, it is optimized and one of the feasible options is given: the first control check valve is set on the reciprocating oil circuit of the lower brake cylinder group. The first control branch is connected to the first control one-way valve, and the first control branch is provided with a first relief valve. When the internal pressure of the first accumulator reaches the set value, the first relief valve opens, and the first control The branch circuit opens the first control check valve so as to communicate with the reciprocating oil circuit of the lower brake cylinder group. When adopting such a scheme, if the first overflow valve does not overflow, the first control check valve is always closed, the reciprocating oil circuit of the lower brake cylinder group cannot pass oil, and the lower brake cylinder group always keeps the oil drained tightly state.

Further, there is a logic control oil circuit 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 tightened at the same time. The logic here The control oil circuit is the second control branch and the third control branch. The specific setting structure is not uniquely limited. Here we will optimize and give one of the feasible options: a linkage control valve is set on the reciprocating oil circuit of the electrode cylinder group , under normal conditions and when the second control branch gets oil, the linkage control valve is located at the first working position and connected to the reciprocating oil circuit of the electrode cylinder group; The control valve is located at the second working position and blocks the reciprocating oil circuit of the electrode cylinder. When such a scheme is adopted, the upper brake cylinder group and the lower brake cylinder group get oil at the same time or discharge oil at the same time, and there is no simultaneous tightness, and the linkage control valve is opened to allow the electrode cylinder group to pass oil; the upper brake cylinder group gets The oil and lower brake cylinders are held tight at the same time when the oil is drained. At this time, the linkage control valve is closed, and the electrode cylinders cannot operate with oil, so as to avoid the electrodes being damaged; and under normal conditions, there is no oil and lower brake cylinders. Therefore, the action of the electrode under this working condition is not considered; even if the upper brake cylinder group drains oil and the lower brake cylinder group receives oil under abnormal working conditions, the After the timely intervention of the protection branch, the lower brake cylinder group will be drained to avoid the simultaneous loosening of the upper brake cylinder group and the lower brake cylinder group.

Further, in order to improve the linkage control reliability of the second control branch and the third control branch, especially when the upper brake cylinder group and the lower brake cylinder group receive oil at the same time, it is ensured that the linkage control valve can be smoothly switched to The first working position is optimized here and one of the feasible options is given: the third control branch is provided with a pressure reducing valve. When such a solution is adopted, by reasonably setting the output pressure of the pressure reducing valve, it can be reset to the first working position under the joint action of the second control branch and the structure of the linkage control valve itself.

Further, in logic control, considering a certain control sequence and hysteresis, the oil circuit where the first accumulator and the second accumulator are located is optimized here, and the following feasible option is given: The oil inlet and outlet pipelines of the first accumulator and the second accumulator are respectively provided with a first sequence valve and a second sequence valve; When the reciprocating oil circuit of the lower brake cylinder group reaches the set pressure, the first sequence valve is opened; the reciprocating oil circuit of the lower brake cylinder group is connected to the second sequence valve and is used to open the second sequence valve when the reciprocating oil circuit of the lower brake cylinder group reaches the set pressure. sequence valve. When such a solution is adopted, the conditions for starting energy storage of the first accumulator and the second accumulator can be set, which improves the control flexibility of the hydraulic control system.

Further, in order to make the control branch behind the first accumulator and the second accumulator more controllable, and avoid the premature intervention of the lower brake cylinder group and the linkage control valve, here is an optimization and the list A feasible option: the first control branch and the second control branch are respectively provided with a first relief valve and a second relief valve. When such a scheme is adopted, when the pressure of the first accumulator reaches the relief pressure of the first relief valve, the lower brake cylinder group will intervene to get oil; when the pressure of the second accumulator reaches the relief pressure of the second relief valve The overflow pressure of the linkage control valve will move to the first working position.

Further, in order to make the pipeline control flexibility in the hydraulic control system more flexible, here is an optimization and one of the feasible options: the reciprocating oil circuit of the upper brake cylinder group, and/or the lower brake A throttling valve is arranged on the reciprocating oil circuit of the oil cylinder group, and/or the reciprocating oil circuit of the electrode cylinder group, and/or the oil inlet end of the first accumulator, and/or the oil inlet end of the second accumulator. When such a scheme is adopted, the flow rate of each oil circuit can be adjusted and controlled according to the system demand, thereby improving the control flexibility of the system.

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 general control structure, and the specific structure is not uniquely limited. Here we will optimize and give one of the feasible options: The reciprocating oil circuit of the upper brake cylinder group, the reciprocating oil circuit of the lower brake cylinder group and the reciprocating oil circuit of the electrode cylinder group are all provided with a control throttling assembly, and the control throttle assembly includes a series connected electromagnetic Control valves and throttle valves. When such a solution is adopted, an oil inlet pipeline and an oil discharge pipeline are connected between the circulating oil circuit and the electromagnetic control valve, and the communication relationship between the oil inlet pipeline and the oil discharge pipeline is switched through the electromagnetic control valve.

The above discloses the composition of the electrode hydraulic control system, and the present invention also discloses a hydraulic control method through the above electrode hydraulic control system, which is now explained:

An electrode hydraulic control method for a submerged arc furnace, using the control system disclosed in the foregoing content, including:

In the initial state, the reciprocating oil circuit of the upper brake cylinder group is connected and the pressure of the upper brake cylinder group is released, and the reciprocating oil circuit of the lower brake cylinder group is blocked by the first control branch and the pressure of the lower brake cylinder group is released. Hold tight, the linkage control valve is located at the first working position so that the reciprocating oil circuit of the electrode cylinder group is connected and can be operated through oil;

Open the reciprocating oil circuit of the upper brake cylinder group and make the oil action of the upper brake cylinder group to hold tightly. After the reciprocating oil circuit of the upper brake cylinder group reaches the set pressure, the first accumulator starts to store energy, and at the same time the third The 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;

When the first accumulator reaches the set pressure value, the first control branch connects the reciprocating oil circuit of the lower brake cylinder group and makes the lower brake cylinder group open and loosen, and at the same time, the reciprocating oil circuit of the upper brake cylinder group If blocked, the upper brake cannot release the pressure. After the reciprocating oil circuit of the lower brake cylinder group reaches the set pressure, the second accumulator starts 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. Position to connect the reciprocating oil circuit of the electrode cylinder group and restore the oil flow action;

At the moment, the brake cylinder group releases pressure and locks tightly, and the second accumulator releases pressure synchronously. 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. , the electrode cylinder stops the oil flow action;

After the pressure relief of the lower brake cylinder group is completed, the pressure release of the upper brake cylinder group releases, the pressure of the first accumulator is released synchronously, the first control branch blocks the reciprocating oil circuit of the lower brake assembly simultaneously, and the third control The branch circuit loses pressure to restore the linkage control valve to the first working position, and the electrode oil cylinder resumes the oil-passing action.

The hydraulic control method disclosed above can form a logical feedback control between the upper brake cylinder group and the lower brake cylinder group, and avoid damage to the electrode cylinder after the upper brake cylinder group and the lower brake cylinder group are simultaneously locked. Case.

Further, in the process of receiving oil from the upper brake cylinder group, the first accumulator is controlled by the first sequence valve to start accumulating energy; in the process of receiving oil from the lower brake cylinder group, the first accumulator is controlled by the second sequence valve. Two accumulators start to store energy.

Further, in order to avoid the situation that the upper brake cylinder group and the lower brake cylinder group are loosened at the same time and cause the electrode to fall, here is an optimization and one of the feasible options is given: when the lower brake cylinder group is activated, Drive the first oil return control valve to close to block the communication between the reciprocating oil circuit and the circulating oil circuit of the upper brake cylinder group; after the oil discharge of the lower brake cylinder group is completed, the first oil return control valve is reset and opened. When such a scheme is adopted, 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, so as to avoid the situation that the reciprocating oil circuit of the upper brake cylinder group drains oil first.

Furthermore, in order to improve the reliability of the hydraulic control method, when the reciprocating oil circuit of the upper brake cylinder group releases pressure first under abnormal conditions, it will be remedied. Here we will optimize and give one of the feasible options: When the brake oil cylinder group drains oil and loses pressure, the protection branch is connected through the fourth control branch to control the oil discharge of the lower brake oil cylinder group to hold tightly. When such a scheme is adopted, when the reciprocating oil circuit of the upper brake cylinder group first drains oil and loses pressure, under the remedy of the fourth control branch, the reciprocating oil circuit of the lower brake cylinder group is drained and tightened to prevent the electrode from falling .

Compared with the prior art, some beneficial effects of the technical solutions disclosed in the present invention include:

The hydraulic control system and hydraulic control method provided by the present invention can carry out linkage control on the upper brake cylinder group, the lower brake cylinder group and the electrode cylinder group of the submerged arc furnace, and can avoid up and down during the hydraulic control process of the three. When the brakes are held tightly at the same time, the electrode will be damaged, and the situation that the upper and lower brakes are released at the same time will cause the electrode to fall. The working logic and feedback control of the entire hydraulic system are clearer, and it can be operated through remote control and PLC control, which can ensure the normal and stable operation of the hydraulic system even in the case of manual operation.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some of the embodiments of the present invention, and therefore should not As a limitation of the scope, those skilled in the art can also obtain other related drawings based on these drawings without creative work.

Figure 1 is a schematic diagram of the composition and structure of the hydraulic control system.

Fig. 2 is a schematic diagram of the linkage control of the oil-obtaining process of the hydraulic control system.

Fig. 3 is a schematic diagram of the linkage control of the oil draining process of the hydraulic control system.

Fig. 4 is a schematic diagram of the remedial process after oil leakage and pressure loss of the brake cylinder group on the hydraulic control system.

In the above drawings, the meanings of each label are:

1. Upper brake cylinder group; 2. Lower brake cylinder group; 3. Electrode cylinder group; 4. Circulating oil circuit; 401. Oil delivery pipeline; 402. Oil return pipeline; 5. First control branch; 6. The third control branch; 7. The second control branch; 8. The protection branch; 9. The first oil return control valve; 10. The electromagnetic control valve; 11. The throttle valve; 12. The first control check valve; 13. Protection control valve; 14. First sequence valve; 15. First accumulator; 16. First overflow valve; 17. Second sequence valve; 18. Second accumulator; 19. Second overflow valve; 20, linkage control valve; 21, pressure reducing valve.

Detailed ways

The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

In view of the poor control stability of the existing electrode hydraulic control system of the submerged arc furnace, it is easy to cause the electrode oil cylinder to continue to move after the upper and lower brakes are tightened, resulting in electrode damage, or the upper and lower brakes are released at the same time, resulting in the electrode falling, and manual operation at the same time If the reliability of the system cannot be guaranteed, the following embodiments are optimized and overcome the defects in the prior art.

Example 1

As shown in FIG. 1 , this embodiment provides an electrode hydraulic control system for a submerged arc furnace, which aims to improve the stability and reliability of the hydraulic control system and avoid damage caused by control errors.

Specifically, as the electrode hydraulic control system disclosed in this embodiment, one of its structures includes:

The circulating oil circuit 4 for supplying hydraulic oil is respectively connected to the oil cylinder assembly through a number of reciprocating oil circuits; the oil cylinder assembly obtains oil from the circulating oil circuit 4 through the reciprocating oil circuit, and returns oil to the circulating oil circuit 4 for reset; the oil cylinder The assembly includes 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.

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 requirements of the entire hydraulic control system.

In this embodiment, the upper brake cylinder group 1, the lower brake cylinder group 2 and the electrode cylinder group 3 communicate with the circulating oil circuit 4 through a reciprocating oil circuit respectively, and the front end of the reciprocating oil circuit forms an oil inlet pipeline and an oil discharge pipeline , and communicate with the oil delivery pipeline 401 and the oil return pipeline 402 respectively.

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, and the specific structure is not uniquely limited, and optimization is performed here And adopt one of the feasible options: 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, The control throttling assembly includes an electromagnetic control valve 10 and a throttle valve 11 connected in series. When such a solution is adopted, an oil inlet pipeline and an oil discharge pipeline are communicated between the circulating oil circuit 4 and the electromagnetic control valve 10 , and the communication relationship between the oil inlet pipeline and the oil discharge pipeline is switched through the electromagnetic control valve 10 .

Preferably, the electromagnetic control valve 10 of the upper brake cylinder group 1 and the lower brake cylinder group 2 adopts a two-position three-way electrode valve, which is connected to the oil discharge pipeline and drains oil in the first position, and connected to the inlet valve in the second position. Oil pipeline and get oil action. The electromagnetic control valve 10 of the electrode cylinder group 3 adopts a three-position four-way valve, which connects the oil drain line and drains oil at the first position, disconnects all oil circuits at the second position, and connects the oil inlet at the third position. Road and carry out the oil action.

In order to make the pipeline control in the hydraulic control system more flexible, this embodiment optimizes and adopts one of the feasible options: the reciprocating oil circuit of the upper brake cylinder group 1, and/or the lower brake cylinder A throttling valve is provided on the reciprocating oil circuit of 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 11. When such a scheme is adopted, the flow rate of each oil circuit can be adjusted and controlled according to the system demand, thereby improving the control flexibility of the system.

As the electrode hydraulic control system disclosed in this embodiment, its second structure includes:

The first accumulator 15 used for logical control between the upper brake cylinder group 1 and the lower brake cylinder group 2, its oil inlet and outlet pipelines are connected to the reciprocating oil circuit of the upper brake cylinder group 1 and connected to the upper brake cylinder group 1 Energy storage is carried out during the process of obtaining oil, and energy is released during the oil return process of the upper brake cylinder group 1; 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.

In this embodiment, since there is a logic control oil circuit between the upper brake cylinder group 1 and the lower brake cylinder group 2, after the upper brake cylinder group 1 moves to a certain extent, the lower brake cylinder group 2 will It can start to move, and the logical control oil circuit is the first control branch 5. The specific structure is not uniquely limited. This embodiment optimizes and adopts one of the feasible options: the reciprocating oil circuit of the lower brake cylinder group 2 is set There is a first control check valve 12, the first control branch 5 is connected to the first control check valve 12 and the first control branch 5 is provided with a first overflow valve 16, when the first accumulator 15 After the internal pressure reaches the set value, the first relief valve 16 is opened, and the first control branch 5 opens the first control check valve 12 to communicate with the reciprocating oil circuit of the lower brake cylinder group 2 . When using such a scheme, if the first overflow valve 16 does not overflow, the first control check valve 12 is always closed, the reciprocating oil circuit of the lower brake cylinder group 2 cannot pass oil, and the lower brake cylinder group 2 is always maintained Drain tight state.

As the electrode hydraulic control system disclosed in this embodiment, its third structure includes:

The second accumulator 18 used for logic control between the lower brake cylinder group 2 and the electrode cylinder group 3, its oil inlet and outlet pipelines are connected to the reciprocating oil circuit of the lower brake cylinder group 2 and oil is obtained from the lower brake cylinder group 2 Energy storage is carried out during the process, and the energy is released during the oil return process of the lower brake cylinder group 2; 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 for the second accumulator After the energy device 18 reaches the set pressure, the reciprocating oil circuit of the electrode oil cylinder is opened, otherwise it remains closed.

Preferably, in the logic control, considering a certain control sequence and hysteresis, this embodiment optimizes the oil circuit where the first accumulator 15 and the second accumulator 18 are located, and adopts the following feasible option: The first sequence valve 14 and the second sequence valve 17 are respectively arranged on the inlet and outlet pipelines of the first accumulator 15 and the second accumulator 18; 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 the set pressure; the reciprocating oil circuit of the lower brake cylinder group 2 is connected to the second sequence valve 17 and used for the lower brake cylinder group When the reciprocating oil passage of 2 reaches the set pressure, the second sequence valve 17 is opened. When such a solution is adopted, the conditions for starting energy storage of the first accumulator 15 and the second accumulator 18 can be set, which improves the control flexibility of the hydraulic control system.

In order to make the control branch behind the first accumulator 15 and the second accumulator 18 more controllable, and avoid the premature intervention of the lower brake cylinder group 2 and the linkage control valve 20, this embodiment is optimized and adopted One feasible option: the first control branch 5 and the second control branch 7 are respectively provided with a first relief valve 16 and a second relief valve 19 . When such a solution is adopted, when the pressure of the first accumulator 15 reaches the overflow pressure of the first overflow valve 16, the lower brake cylinder group 2 will intervene to get oil; when the pressure of the second accumulator 18 reaches the first overflow pressure The overflow pressure of the second relief valve 19, the linkage control valve 20 will move to the first working position.

As the electrode hydraulic control system disclosed in this embodiment, its fourth structure includes:

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 for the upper brake cylinder. Block the reciprocating oil circuit of the electrode cylinder group 3 when the reciprocating oil circuit gets oil;

In this embodiment, a logical control oil circuit is set 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 Unable to operate, the logic control oil circuit here is the second control branch 7 and the third control branch 6, the specific setting structure is not uniquely limited, here we optimize and adopt one of the feasible options: electrode cylinder group 3 is provided with a linkage control valve 20 on the reciprocating oil circuit. Under normal conditions and when the second control branch 7 receives oil, the linkage control valve 20 is located at the first working position and connected to the reciprocating oil circuit of the electrode cylinder group 3; When the cylinder group 1 receives oil, the linkage control valve 20 is positioned at the second working position through the third control branch 6 and the reciprocating oil circuit of the electrode cylinder is blocked. When such a scheme is adopted, the upper brake cylinder group 1 and the lower brake cylinder group 2 receive oil at the same time or drain oil at the same time, and there is no simultaneous tightness, and the linkage control valve 20 is opened to allow the electrode cylinder group 3 to pass oil; Brake cylinder group 1 gets oil and lower brake cylinder group 2 releases oil at the same time. At this time, the linkage control valve 20 is closed, and the electrode cylinder group 3 cannot operate with oil, so as to avoid the electrode being damaged; The brake cylinder group 2 gets oil and the lower brake cylinder group 2 drains oil, so the action of the electrode under this working condition is not considered; even if the upper brake cylinder group 1 drains oil under abnormal working conditions, the lower brake cylinder group In the working condition of brake cylinder group 2 receiving oil, the lower brake cylinder group 2 will also drain oil after the timely intervention of the protection branch 8, so as to avoid the simultaneous release of upper brake cylinder group 1 and lower brake cylinder group 2 Case.

Preferably, in order to improve the linkage control reliability of the second control branch 7 and the third control branch 6, especially when the upper brake cylinder group 1 and the lower brake cylinder group 2 receive oil at the same time, ensure that the linkage control valve 20 can be smoothly switched to the first working position, where optimization is carried out and one of the feasible options is adopted: the third control branch 6 is provided with a pressure reducing valve 21 . When such a solution is adopted, by reasonably setting the output pressure of the pressure reducing valve 21, it can be reset to the first working position under the joint action of the second control branch 7 and the structure of the linkage control valve 20 itself.

In the hydraulic control system disclosed in this embodiment, a first control branch 5, a second control branch 7 and a third control branch are set between the upper brake cylinder group 1, the lower brake cylinder group 2 and the electrode cylinder group 3. Road 6, during the action process of the upper brake cylinder group 1 and the lower brake cylinder group 2, the movement of the electrode cylinder group 3 is limited to protect the electrode cylinder group 3, making the action logic of the hydraulic control system clearer and controllable, no matter through Remote computer control, PLC control or on-site human control can effectively guarantee the stable operation of the hydraulic control system and avoid system failure or operation damage.

Example 2

As shown in Figure 1, this embodiment improves the solution on the basis of Embodiment 1 to improve the safety of the hydraulic control system and avoid the simultaneous release of the upper brake and the lower brake, and when such a situation occurs Take remedial action when the situation arises.

Specifically, in this embodiment, in order to avoid the situation that the upper brake cylinder and the lower brake cylinder are loosened at the same time and cause the electrode to drop, the reciprocating oil circuit of the upper brake cylinder group 1 and the lower brake cylinder group 2 is 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, and one end of the protection branch 8 is connected to the reciprocating oil circuit of the lower brake cylinder group 2 and the second The other end of the accumulator 18’s inlet and outlet oil circuit extends and communicates with the circulating oil circuit 4 to return oil; the protection branch 8 is provided with a protection control valve 13, and the reciprocating oil circuit of the upper brake cylinder group 1 is provided with a fourth control branch. and connected to the protection control valve 13. When the reciprocating oil passage of the upper brake cylinder group 1 is connected with oil, the fourth control branch makes the protection control valve 13 close. When the reciprocating oil passage of the upper brake cylinder group 1 drains oil and loses pressure At the same time, the fourth control branch makes the protection control valve 13 open to drain oil from the reciprocating oil circuit of the lower brake cylinder group 2 . When such a scheme is adopted, the oil pressure in the reciprocating oil circuit controls and closes the protection control valve 13 when the oil is obtained by the upper brake cylinder group 1. Under normal conditions, the protection branch 8 is in a blocked state, and the lower brake cylinder group 2 The reciprocating oil circuit cannot drain oil from the protection branch 8; when some abnormal conditions 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 The protection control valve 13 is closed, so that the protection branch 8 is opened, and the reciprocating oil circuit of the lower brake cylinder group 2 is drained. state, the upper brake cylinder group 1 is loosened, the lower brake cylinder group 2 is tightly held, and the electrode cylinder group 3 can operate normally.

Preferably, in order to improve the safety and stability of the upper brake cylinder group 1, reduce the situation that the upper brake cylinder group 1 drains oil and lose pressure before the lower brake cylinder group 2, and ensure the stability and reliability of the hydraulic control system, the optimization is carried out here And adopt one of the feasible options: the part where the reciprocating oil circuit of the upper brake cylinder group 1 is connected with the circulating oil circuit 4 is provided with a first oil return control valve 9, and the reciprocating oil circuit of the lower brake cylinder group 2 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 acts 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 oil return of the lower brake cylinder group 2 is completed, the first oil return control valve 9 acts 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 such a solution is adopted, the first oil return control valve 9 performs oil drain control on the reciprocating oil circuit of the upper brake cylinder group 1, which improves the safety and reliability of the hydraulic control system.

Example 3

The above-mentioned embodiment 1 and embodiment 2 disclose the composition of the electrode hydraulic control system. This embodiment discloses the method of hydraulic control through the electrode hydraulic control system in the above embodiment. The description is now given:

As shown in Figures 2 to 4, an electrode hydraulic control method for a submerged arc furnace, using the control system disclosed in the foregoing embodiments, includes:

In the initial state, the reciprocating oil circuit of the upper brake cylinder group 1 is connected and the pressure of the upper brake cylinder group 1 is released, and 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 1 is released. The oil cylinder group 2 is pressure-relieved and tightly held, and the linkage control valve 20 is located at the first working position so that the reciprocating oil circuit of the electrode cylinder group 3 is connected and can be operated through oil;

Open the reciprocating oil circuit of the upper brake cylinder group 1 and make the upper brake cylinder group 1 get oil to act to hold tightly. 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 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 from the lower brake cylinder group 2, and the current brake cylinder group 2 After the reciprocating oil circuit reaches the set pressure, the second accumulator 18 starts to store energy, and 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 make the reciprocating oil circuit of the electrode cylinder group 3 communicate and resume the oil-through action;

When the brake cylinder group 2 releases pressure and locks tightly, the second accumulator 18 releases pressure synchronously, and the second control branch 7 and the third control branch 6 link to switch the linkage control valve 20 to the second working position to block the electrode The reciprocating oil circuit of the oil cylinder, the electrode oil cylinder stops the oil flow action;

After the pressure relief of the lower brake cylinder group 2 is completed, the upper brake cylinder group 1 releases the pressure, the first accumulator 15 releases the pressure synchronously, and the first control branch 5 interlocks to block the reciprocating oil circuit of the lower brake assembly. 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 oil cylinder resumes the oil-passing action.

In this embodiment, the first accumulator 15 is controlled by the first sequence valve 14 to start accumulating energy during the oil-obtaining process of the upper brake cylinder group 1; The second sequence valve 17 controls the second accumulator 18 to start accumulating energy.

In this embodiment, in order to avoid the situation that the upper brake cylinder group 1 and the lower brake cylinder group 2 are loosened at the same time and cause the electrode to drop, an optimization is carried out here and one of the feasible options is adopted: the current brake cylinder group 2 When the oil is obtained, the first oil return control valve 9 is driven to close to block the connection between the reciprocating oil circuit of the upper brake cylinder group 1 and the circulating oil circuit 4; after the oil discharge of the lower brake cylinder group 2 is completed, the first oil return control Valve 9 is reset and opened. When such a scheme is adopted, the reciprocating oil circuit of the lower brake cylinder group 2 is used to block and control the reciprocating oil circuit of the upper brake cylinder group 1, so as to avoid the situation that the reciprocating oil circuit of the upper brake cylinder group 1 drains oil first.

In order to improve the reliability of the hydraulic control method and perform remediation when the reciprocating oil circuit of the upper brake cylinder group 1 releases pressure first under abnormal circumstances, this embodiment optimizes and adopts one of the feasible options: when the upper brake When the cylinder group 1 drains oil and loses pressure, the protection branch 8 is connected through the fourth control branch to control the lower brake cylinder group 2 to drain oil and hold tightly. When such a scheme is adopted, when the reciprocating oil circuit of the upper brake cylinder group 1 first drains oil and loses pressure, under the remedy of the fourth control branch, the reciprocating oil circuit of the lower brake cylinder group 2 is drained and tightened to avoid the electrode drop.

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, preventing the upper brake cylinder group 1 and the lower brake cylinder group 2 from simultaneously tightening the rear electrode The cylinder also continues to act causing damage.

The above is the implementation manners listed in this embodiment, but this embodiment is not limited to the above optional implementation manners, and those skilled in the art can obtain other various implementation manners according to the above-mentioned manners combined with each other arbitrarily, anyone in this embodiment Various other forms of implementation can be drawn under the inspiration. The above specific implementation manners should not be understood as limiting the protection scope of this embodiment, and the protection scope of this embodiment should be defined in the claims.

Claims (14)

1. An electrode hydraulic control system of a submerged arc furnace, comprising:

the circulating oil way (4) is respectively connected with the oil cylinder assembly through a plurality of reciprocating oil ways; the oil cylinder assembly obtains oil from the circulating oil path (4) through a reciprocating oil path, and returns oil to the circulating oil path (4) for resetting; the oil cylinder assembly comprises an upper band-type brake oil cylinder group (1) for driving the upper band-type brake to act, a lower band-type brake oil cylinder group (2) for driving the lower band-type brake to act and an electrode oil cylinder group (3) for driving the electrode to act;

the oil inlet and outlet pipeline of the first energy accumulator (15) is communicated with a reciprocating oil way of the upper band-type brake oil cylinder group (1) and used for accumulating energy in the process of obtaining oil from the upper band-type brake oil cylinder group (1) and discharging energy in the oil return process of the upper band-type brake oil cylinder group (1); the first energy accumulator (15) is communicated with a reciprocating oil way of the lower band-type brake oil cylinder group (2) through the first control branch (5) and is used for enabling the reciprocating oil way of the lower band-type brake oil cylinder group (2) to be opened after the first energy accumulator (15) reaches a set pressure, otherwise, the reciprocating oil way of the lower band-type brake oil cylinder group (2) is kept closed;

the oil inlet and outlet pipeline of the second energy accumulator (18) is communicated with a reciprocating oil way of the lower band-type brake oil cylinder group (2) and is used for accumulating energy in the process of obtaining oil from the lower band-type brake oil cylinder group (2) and discharging energy in the process of returning oil from the lower band-type brake oil cylinder group (2); the second energy accumulator (18) is communicated with a reciprocating oil way of the electrode oil cylinder group through a second control branch (7) and is used for enabling the reciprocating oil way of the electrode oil cylinder to be opened after the second energy accumulator (18) reaches a set pressure, otherwise, the reciprocating oil way of the electrode oil cylinder is kept closed;

The third control branch (6) extends from the reciprocating oil way of the upper band-type brake oil cylinder group (1) to the reciprocating oil way of the electrode oil cylinder group (3) and is used for blocking the reciprocating oil way of the electrode oil cylinder group (3) when the reciprocating oil way of the upper band-type brake oil cylinder obtains oil; the third control branch (6) and the second control branch (7) jointly act to control the on-off of a reciprocating oil way of the electrode oil cylinder group (3).

2. The electrode hydraulic control system of a submerged arc furnace of claim 1, wherein: the lower band-type brake oil cylinder group (2) is provided with a protection branch (8), one end of the protection branch (8) is communicated with a reciprocating oil way of the lower band-type brake oil cylinder group (2) and an oil inlet and outlet way of the second energy accumulator (18), and the other end of the protection branch extends and is communicated with the circulating oil way (4) to return oil; the protection branch circuit (8) is provided with a protection control valve (13), a fourth control branch circuit is arranged on a reciprocating oil circuit of the upper band-type brake oil cylinder group (1) and is communicated with the protection control valve (13), when oil is communicated to a reciprocating oil circuit of the upper band-type brake oil cylinder group (1), the fourth control branch circuit enables the protection control valve (13) to be closed, and when oil is drained from the reciprocating oil circuit of the upper band-type brake oil cylinder group (1) and is depressurized, the fourth control branch circuit enables the protection control valve (13) to be opened so as to enable the reciprocating oil circuit of the lower band-type brake oil cylinder group (2) to drain oil.

3. The electrode hydraulic control system of a submerged arc furnace according to claim 1 or 2, characterized in that: the part of the reciprocating oil way of the upper band-type brake oil cylinder group (1) connected with the circulating oil way (4) is provided with a first oil return control valve (9), and the reciprocating oil way of the lower band-type brake oil cylinder group (2) is communicated with the first oil return control valve (9); when the lower band-type brake oil cylinder group (2) obtains oil, the first oil return control valve (9) acts and closes a reciprocating oil way of the upper band-type brake oil cylinder group (1) to prevent the upper band-type brake oil cylinder group (1) from returning oil; after the oil return of the lower band-type brake oil cylinder group (2) is finished, the first oil return control valve (9) acts and opens a reciprocating oil way of the upper band-type brake oil cylinder group (1) to allow the upper band-type brake oil cylinder group (1) to return oil.

4. The electrode hydraulic control system of a submerged arc furnace of claim 1, wherein: the reciprocating oil way of the lower band-type brake oil cylinder group (2) is provided with a first control one-way valve (12), the first control branch (5) is communicated to the first control one-way valve (12) and is provided with a first overflow valve (16), after the internal pressure of the first energy accumulator (15) reaches a set value, the first overflow valve (16) is opened, and the first control branch (5) enables the first control one-way valve (12) to be opened so that the reciprocating oil way of the lower band-type brake oil cylinder group (2) is communicated.

5. The electrode hydraulic control system of a submerged arc furnace of claim 1, wherein: a linkage control valve (20) is arranged on a reciprocating oil path of the electrode oil cylinder group (3), and the linkage control valve (20) is positioned at a first working position and communicated with the reciprocating oil path of the electrode oil cylinder group (3) under the condition that oil is obtained by the second control branch (7) in a normal state; when the upper band-type brake oil cylinder group (1) gets oil to act, the linkage control valve (20) is positioned at the second working position through the third control branch (6) and blocks a reciprocating oil way of the electrode oil cylinder.

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

7. The electrode hydraulic control system of a submerged arc furnace of claim 1, wherein: the oil inlet and outlet pipelines of the first energy accumulator (15) and the second energy accumulator (18) are respectively provided with a first sequence valve (14) and a second sequence valve (17); the reciprocating oil way of the upper band-type brake oil cylinder group (1) is communicated with the first sequence valve (14) and is used for opening the first sequence valve (14) when the reciprocating oil way of the upper band-type brake oil cylinder group (1) reaches a set pressure; the reciprocating oil way of the lower band-type brake oil cylinder group (2) is communicated with the second sequence valve (17) and is used for opening the second sequence valve (17) when the reciprocating oil way of the lower band-type brake oil cylinder group (2) reaches a set pressure.

8. The electrode hydraulic control system of a submerged arc furnace of claim 1, wherein: a throttle valve (11) is arranged on the reciprocating oil path of the upper band-type brake oil cylinder group (1), and/or the reciprocating oil path of the lower band-type brake oil cylinder group (2), and/or the reciprocating oil path of the electrode oil cylinder group, and/or the oil inlet end of the first energy accumulator (15), and/or the oil inlet end of the second energy accumulator (18).

9. The electrode hydraulic control system of a submerged arc furnace of claim 1, wherein: 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).

10. The electrode hydraulic control system of a submerged arc furnace of claim 1, wherein: the reciprocating oil way of the upper band-type brake oil cylinder group (1), the reciprocating oil way of the lower band-type brake oil cylinder group (2) and the reciprocating oil way of the electrode oil cylinder group (3) are respectively provided with a control throttling component, and the control throttling component comprises an electromagnetic control valve (10) and a throttling valve (11) which are communicated in series.

11. A method of controlling the electrode hydraulic pressure of a submerged arc furnace, applying the control system according to any one of claims 1 to 10, characterized by comprising:

in an initial state, a reciprocating oil way of the upper band-type brake oil cylinder group (1) is communicated, the upper band-type brake oil cylinder group (1) is depressurized and released, a reciprocating oil way of the lower band-type brake oil cylinder group (2) is blocked by a first control branch (5), the lower band-type brake oil cylinder group (2) is depressurized and held tightly, and a linkage control valve (20) is positioned at a first working position so that the reciprocating oil way of the electrode oil cylinder group (3) is communicated and can be communicated with oil;

opening a reciprocating oil way of the upper band-type brake oil cylinder group (1) and enabling the upper band-type brake oil cylinder group (1) to obtain oil for tightly holding, starting energy storage of the first energy accumulator (15) after the reciprocating oil way of the upper band-type brake oil cylinder group (1) reaches a set pressure, and simultaneously switching the linkage control valve (20) to a second working position by the third control branch (6) to enable the reciprocating oil way of the electrode oil cylinder group (3) to be blocked and stop oil passing action;

When the first energy accumulator (15) reaches a set pressure value, the first control branch (5) enables a reciprocating oil way of the lower band-type brake oil cylinder group (2) to be communicated and enables the lower band-type brake oil cylinder group (2) to be opened, the second energy accumulator (18) starts to store energy after the reciprocating oil way of the lower band-type brake oil cylinder group (2) reaches the set pressure, and when the pressure of the second energy accumulator (18) reaches the set pressure value, the second control branch (7) resets the linkage control valve (20) to a first working position so as to enable the reciprocating oil way of the electrode oil cylinder group (3) to be communicated and restore the oil-flowing action;

when the lower band-type brake oil cylinder group (2) is subjected to pressure relief and enclasping, the second energy accumulator (18) is subjected to pressure relief synchronously, the second control branch (7) and the third control branch (6) are linked to switch the linkage control valve (20) to a second working position so as to block a reciprocating oil way of the electrode oil cylinder, and the electrode oil cylinder stops the oil passing action;

after the decompression of the lower band-type brake cylinder group (2) is finished, the decompression of the upper band-type brake cylinder group (1) is released, the first energy accumulator (15) is synchronously decompressed, the first control branch (5) is linked to block the reciprocating oil way of the lower band-type brake assembly, and meanwhile, the third control branch (6) is decompressed to enable the linkage control valve (20) to restore to the first working position, and the electrode cylinder restores to the oil-passing action.

12. The hydraulic control method according to claim 11, characterized in that: in the process of oil obtaining action of the upper band-type brake oil cylinder group (1), a first accumulator (15) is controlled to start energy storage through a first sequence valve (14); in the process of oil obtaining action of the lower band-type brake cylinder group (2), the second accumulator (18) is controlled to start energy storage through the second sequence valve (17).

13. The hydraulic control method according to claim 11, characterized in that: when the lower band-type brake cylinder group (2) gets oil to act, the first oil return control valve (9) is driven to be closed so as to block the communication between a reciprocating oil way and a circulating oil way (4) of the upper band-type brake cylinder group (1); after the oil drainage of the lower band-type brake oil cylinder group (2) is finished, the first oil return control valve (9) is reset and opened.

14. The hydraulic control method according to claim 11, characterized in that: when the upper band-type brake oil cylinder group (1) discharges oil and loses pressure, the protection branch (8) is communicated through the fourth control branch to control the lower band-type brake oil cylinder group (2) to discharge oil and hold tightly.

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