Dual-system electrode adjusting device

Abstract

The utility model discloses a dual-system electrode adjusting device, which comprises a change-over switch connected with an execution end of a PLC (Programmable Logic Controller) control system; the first system three-phase arc current sampling equipment is connected to a corresponding switching end of the change-over switch; the input end of the first electrode adjusting system is connected with the output end of the first system three-phase arc current sampling equipment; the output end of the first electrode adjusting system is connected with the field proportional valve; the first system upper computer is connected with the output end of the first electrode adjusting system; the second system three-phase arc current sampling equipment is connected to a second electrode adjusting system at the corresponding switching end of the change-over switch, and the input end of the second system three-phase arc current sampling equipment is connected with the output end of the second system three-phase arc current sampling equipment; the output end of the second electrode adjusting system is connected with the field proportional valve; and the second system upper computer is connected with the output end of the second electrode adjusting system.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical automation equipment, in particular to a dual-system electrode regulating device. Background Art

[0002] In order to save resources, improve LF furnace smelting efficiency and save electricity, upgrading the hardware system of LF furnace smelting equipment is not very meaningful and the cost is high. Therefore, if on this basis, the adjustment method of the electrode automation control system is changed to improve efficiency, electricity can be saved fundamentally.

[0003] However, the current electrode adjustment system mainly adjusts the arc current, which has poor adjustment accuracy, large deviation, rough electrode adjustment, large stroke, large electrode jitter, and waste of electrical energy. Utility Model Content

[0004] In view of the above technical problems, the utility model provides a dual-system electrode adjustment device.

[0005] In order to achieve the above purpose, the technical solution of the utility model is as follows:

[0006] A dual-system electrode adjustment device, comprising:

[0007] The conversion switch is connected to the execution end of the PLC control system;

[0008] The first system three-phase arc current sampling device is connected to the corresponding switching end of the conversion switch;

[0009] A first electrode adjustment system, whose input end is connected to the output end of the first system three-phase arc current sampling device;

[0010] An output end of a first electrode regulating system, which is connected to a field proportional valve;

[0011] A first system host computer is connected to an output end of the first electrode adjustment system;

[0012] The second system three-phase arc current sampling device is connected to the corresponding switching end of the conversion switch;

[0013] A second electrode adjustment system, whose input end is connected to the output end of the second system three-phase arc current sampling device;

[0014] An output end of a second electrode regulating system, which is connected to an on-site proportional valve;

[0015] The second system host computer is connected to the output end of the second electrode adjustment system.

[0016] The first system three-phase arc current sampling device and the second system three-phase arc current sampling device both use Rogowski coils.

[0017] The transfer switch is composed of several static contact seats embedded in an insulating shell and moving contacts in a movable bracket, wherein the moving contact is a double-breakpoint docking contact bridge, which is on a rotating shaft with a handle and rotates to different positions to connect or disconnect the circuit. At the same time, a positioning mechanism is also provided on the transfer switch to limit the position of the transfer switch after a switch.

[0018] The positioning mechanism of the conversion switch adopts a roller-clamp ratchet structure.

[0019] The beneficial effects of the utility model are:

[0020] 1. The utility model realizes on-site arc current detection through the first system three-phase arc current sampling equipment and the second system three-phase arc current sampling equipment, realizes PID adjustment through the calculation analysis of the first electrode adjustment system and the second electrode adjustment system, and at the same time, adjusts the proportional valve. The dual-system signal conversion switch controlled by the PLC control system greatly improves the efficiency of the refining furnace, saves electric energy, shortens the fault handling time, and saves production costs.

[0021] 2. When the utility model is implemented, when a set of regulating systems fails, the control switch can be quickly switched to another regulating system through the PLC control system to ensure stable operation of the system. Under the premise of saving equipment expenses, there are obvious improvements in equipment management and control function optimization, energy saving and consumption reduction, etc., especially solving the defects of large up and down stroke and jitter of on-site electrode heating process, unstable heating causing electrode shaking and ladle car shifting. The utility model can also be used to protect electric furnace circuit breakers and large-load tap changers, and can avoid electrode burning and hot spots. Interfaces are also reserved for additional optimization automation systems such as neural networks, which can be connected when on-site conditions are met. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The specific implementation of the utility model is further described in detail below in conjunction with the accompanying drawings.

[0023] Figure 1 It is the principle diagram of the utility model. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in combination with specific implementation methods and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0025] like Figure 1As shown, a dual-system electrode regulating device includes: a conversion switch 1, connected to the execution end of the PLC control system; a first system three-phase arc current sampling device 2, connected to the corresponding switching end of the conversion switch 1; a first electrode regulating system 3, whose input end is connected to the output end of the first system three-phase arc current sampling device 2; an output end 4 of the first electrode regulating system, which is connected to the field proportional valve 5; a first system host computer 6, connected to the output end 4 of the first electrode regulating system; a second system three-phase arc current sampling device 7, connected to the corresponding switching end of the conversion switch 1; a second electrode regulating system 8, whose input end is connected to the output end of the second system three-phase arc current sampling device 7; an output end 9 of the second electrode regulating system, which is connected to the field proportional valve 5; a second system host computer 10, connected to the output end 9 of the second electrode regulating system. Both the first system three-phase arc current sampling device 2 and the second system three-phase arc current sampling device 7 use Rogowski coils. The transfer switch 1 is composed of several static contact seats embedded in an insulating housing and moving contacts in a movable bracket, wherein the moving contact is a double-breakpoint docking contact bridge, which is on a rotating shaft with a handle and rotates to different positions with the rotating shaft to connect or disconnect the circuit. At the same time, a positioning mechanism is also provided on the transfer switch 1 for limiting the position of the transfer switch 1 after a switching operation, wherein the positioning mechanism of the transfer switch 1 adopts a roller ratchet structure.

[0026] When the utility model is in use, the first electrode adjustment system 3 adopts the Siemens S7-300 control system, and the second electrode adjustment system 8 adopts the Siemens S7-400 control system. The two systems can be connected through a switch and communicate with the host computer to control the adjustment of the two electrodes respectively. The upper screen of the first system host computer 6 adopts WinccV7.0 to communicate with PLCS7-300, and the upper screen of the second system host computer 10 adopts InTouchV9.5 for control, and communicates with PLCS7-400 through the communication software DAserverV1.5. The dual-system switching requires switching the upper operation screens and PLC control systems of two different software to change the electrode adjustment control mode, thereby realizing the switching of the dual-system combined control.

[0027] When the conversion switch 1 is turned to the first electrode adjustment system 3, the screen display of the first system host computer 6 is switched to the first electrode adjustment system 3. At this time, the screen selection authority is switched to the first electrode adjustment system 3, and the system display is switched to the first electrode adjustment system 3. At this time, the arc flow is set in the first electrode adjustment system 3. After the system interlock is met, the proportional valve output is adjusted accordingly. Similarly, when switching to the second electrode adjustment system 8, the authority is automatically switched back. The second electrode adjustment system 8 performs electrode adjustment under the condition that the interlock program is met. The new system conversion has interlock control. Only when the upper and lower operation authorities are all converted in agreement, the system can be fully switched and participate in control. If the upper and lower operation authority selections are inconsistent, the system will not be able to participate in control, and the electrode cannot be adjusted manually or automatically.

[0028] The Rogowski coil used in the utility model is a hollow annular coil that can be directly put on the conductor to be measured. The AC current flowing through the conductor will generate an alternating magnetic field around the conductor, thereby inducing an AC voltage signal proportional to the current transformation ratio in the coil. The Rogowski coil has a wide measurement range, high accuracy, stability and reliability, and a wide response bandwidth. It also has measurement and relay protection functions, and is small in size, light in weight, safe, and meets environmental protection requirements. After sampling, the Rogowski coil of the first electrode adjustment system 3 converts the voltage into 0-100v AC voltage through a 400:100 transformer 2, and then converts it into 4-20ma current through an AC voltage transmitter 3 and inputs it into the analog input module of the Siemens S7-300 control system. After calculation, the electrode is controlled. After sampling, the Rogowski coil of the second electrode adjustment system 8 converts the 0-400v AC voltage into 4-20ma current through a voltage transformer 2 and inputs it into the analog input module of the Siemens S7-400 control system 3. After calculation, the electrode is controlled.

[0029] During control and measurement, the conversion switch 1 can be used to convert the circuit, connect or disconnect the switch quantity and analog quantity signal characteristics. When switching to the first electrode regulation system 3, the first system three-phase arc current sampling device 2 is connected, and the sampling signal enters the first electrode regulation system 3, and is output through the first electrode regulation system 3 after calculation processing, controls the valve platform opening of the on-site proportional valve 5, and displays the sampling current and valve platform opening on the first system host computer 6, thereby realizing the adjustment of the automatic control device of the electrode first electrode regulation system 3; similarly, when switching to the second electrode regulation system 8, the second system three-phase arc current sampling device 7 is connected, and the sampling signal enters the second electrode regulation system 8, and is output through the second electrode regulation system 8 after calculation processing, controls the valve platform opening of the on-site proportional valve 5, and displays the sampling current and valve platform opening on the second system host computer 610, thereby realizing the adjustment of the automatic control device of the electrode second electrode regulation system 8. When switching to the second electrode regulation system 8, the sampling signal of the first electrode regulation system 3 is disconnected, and the output of the proportional valve of the first electrode regulation system 3 is disconnected at the same time, and the automatic control device of the first electrode regulation system 3 does not participate in the adjustment control.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A dual-system electrode adjustment device, characterized in that: include: A transfer switch (1) is connected to the execution end of the PLC control system; A first system three-phase arc current sampling device (2) is connected to a corresponding switching end of the conversion switch (1); A first electrode adjustment system (3), an input end of which is connected to an output end of the first system three-phase arc current sampling device (2); An output end (4) of the first electrode regulation system is connected to an on-site proportional valve (5); A first system host computer (6) connected to an output end (4) of the first electrode adjustment system; A second system three-phase arc current sampling device (7) is connected to a corresponding switching end of the conversion switch (1); A second electrode adjustment system (8), an input end of which is connected to an output end of a second system three-phase arc current sampling device (7); An output end (9) of the second electrode regulation system is connected to the on-site proportional valve (5); The second system host computer (10) is connected to the output end (9) of the second electrode adjustment system.

2. A dual-system electrode adjustment device according to claim 1, characterized in that: The first system three-phase arc current sampling device (2) and the second system three-phase arc current sampling device (7) both use Rogowski coils.

3. A dual-system electrode adjustment device according to claim 1, characterized in that: The transfer switch (1) is composed of a plurality of stationary contact seats embedded in an insulating housing and a movable contact in a movable bracket, wherein the movable contact is a double-breakpoint docking contact bridge, which is on a rotating shaft with a handle and rotates to different positions to connect or disconnect the circuit. At the same time, a positioning mechanism is also provided on the transfer switch (1) for limiting the position of the transfer switch (1) after a switch is performed.

4. A dual-system electrode adjustment device according to claim 3, characterized in that: The positioning mechanism of the conversion switch (1) adopts a roller ratchet structure.

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