CN107682950B - Power constant system capable of automatically adjusting electrode position and working method thereof - Google Patents
Power constant system capable of automatically adjusting electrode position and working method thereof Download PDFInfo
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- CN107682950B CN107682950B CN201711060526.9A CN201711060526A CN107682950B CN 107682950 B CN107682950 B CN 107682950B CN 201711060526 A CN201711060526 A CN 201711060526A CN 107682950 B CN107682950 B CN 107682950B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B7/00—Heating by electric discharge
- H05B7/02—Details
- H05B7/144—Power supplies specially adapted for heating by electric discharge; Automatic control of power, e.g. by positioning of electrodes
- H05B7/148—Automatic control of power
- H05B7/156—Automatic control of power by hydraulic or pneumatic means for positioning of electrodes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention relates to a power constant system capable of automatically adjusting electrode positions and a working method thereof. Compared with the prior art, the invention realizes constant power of electric furnace smelting by using the thought of automatically adjusting the electrode position, and greatly improves smelting production quality and efficiency.
Description
Technical Field
The invention relates to the field of electric furnace steelmaking, in particular to a power constant system capable of automatically adjusting electrode positions and a working method thereof.
Background
When steelmaking is carried out in an electric furnace, the design of a constant-power electrohydraulic servo system for controlling the lifting of an electrode is always a great technical problem which puzzles the quality improvement. The rapid and accurate electrode position control is one of key factors for saving electric energy, shortening smelting period, reducing electrode consumption and prolonging furnace lining life.
When an enterprise smelts, the electrode position cannot be automatically adjusted, so that the fluctuation of current and voltage is overlarge, and the defects of long smelting time, low yield, high electric energy consumption and high electrode consumption are caused.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a power constant system capable of automatically adjusting the electrode position and a working method thereof, and the thought of automatically adjusting the electrode position is used for realizing constant power of electric furnace smelting and greatly improving smelting production quality and efficiency.
The aim of the invention can be achieved by the following technical scheme:
the utility model provides a but constant power system of automatically regulated electrode position, includes the current transformer that is used for detecting electrode current, is used for detecting electrode voltage's isolation transformer, first rectifier, second rectifier, first slide rheostat, three-position tee bend servo valve, plunger jar, oil return oil circuit and oiling oil circuit, the input of first rectifier is connected to the output of current transformer, the input of second rectifier is connected to the output of isolation transformer, the first output of first rectifier is connected the first output of second rectifier and the sliding end of first slide rheostat respectively, the first end of first rectifier and the first signal input part of three-position tee bend servo valve are connected respectively to the second output of first rectifier, the second signal input part of first slide rheostat and three-position tee bend servo valve is connected respectively to the second output of second rectifier, the first interface of three-position tee bend servo valve is connected to the oil cavity of plunger jar, the connection electrode of plunger jar oil return oil circuit is connected to the second interface of three-position tee bend servo valve, the third interface connection oil return oil circuit of three-position servo valve, three-position servo valve three-way servo valve's three-way servo valve on-position servo valve's three-way servo valve on the oil port oil.
The current transformer is characterized by further comprising a second sliding rheostat and a third sliding rheostat, wherein a first output end of the current transformer is respectively connected with a sliding end of the second sliding rheostat, a second end of the second sliding rheostat and a first end of the third sliding rheostat, a second output end of the current transformer is respectively connected with a first end of the second sliding rheostat and a second input end of the first rectifier, and the sliding end and the second end of the second sliding rheostat are both connected with the first input end of the first rectifier.
The three-position three-way servo valve further comprises a fourth slide rheostat, wherein the first end of the fourth slide rheostat is connected with the second output end of the second rectifier and the second end of the first slide rheostat respectively, and the slide end and the second end of the fourth slide rheostat are both connected with the second signal input end of the three-position three-way servo valve.
The oil return way comprises a first energy accumulator and a first safety valve, one end of the first energy accumulator is connected with a second interface of the three-position three-way servo valve, the other end of the first energy accumulator is connected with one end of the first safety valve, and the other end of the first safety valve is connected with an oil tank.
The oiling oil way comprises a second energy accumulator, a second safety valve and an oil pump, wherein one end of the second energy accumulator is respectively connected with a third interface of the three-position three-way servo valve and the output end of the oil pump, the other end of the second energy accumulator is connected with one end of the second safety valve, and the other end of the second safety valve and the input end of the oil pump are both connected with the oil tank.
The working method of the power constant system capable of automatically adjusting the electrode position comprises the following steps:
s1: the sliding end position of the first slide rheostat is adjusted, so that when the electrode current and the electrode voltage are required values, the voltage difference between the two ends of the first slide rheostat is zero, and at the moment, the three-position three-way servo valve is positioned in the middle position, the electrode position is motionless, and the balance state is kept;
s2: when the three-position three-way servo valve detects that the voltage at the first end of the first slide rheostat is smaller than the voltage at the second end, the three-position three-way servo valve is switched to the right position, liquid flow flows into an oil return path from an oil cavity of the plunger cylinder through the three-position three-way servo valve under the action of dead weight of the motor and the plunger cylinder, and the electrode descends along with the driving end of the plunger cylinder until the electrode returns to the balanced state again;
when the three-position three-way servo valve detects that the voltage of the first end of the first slide rheostat is larger than the voltage of the second end, the three-position three-way servo valve is switched to the left position, high-pressure liquid flow flows into an oil cavity of the plunger cylinder from an oil injection oil way through the three-position three-way servo valve, and the electrode rises along with the driving end of the plunger cylinder until the electrode returns to the balanced state again.
Compared with the prior art, the invention has the following advantages:
1. the invention is provided with the comparison circuit consisting of the current transformer, the isolation transformer, the two rectifiers and the slide rheostat, and in the whole smelting process, as long as the arc voltage and the current deviate from preset values, the servo valve works, the electrode can automatically rise or fall, so that the smelting power is kept constant, and the smelting quality and efficiency are greatly improved.
2. The invention has high safety coefficient and has very strong guiding significance for production of smelting enterprises.
3. Through setting up second slide rheostat, third slide rheostat and fourth slide rheostat, with the cooperation of first slide rheostat, can adjust the numerical value of different electric current and voltage requirements to the different power constant demands of adaptation electrode lift, the practicality is strong.
4. The energy storages are respectively arranged in the oil return oil way and the oil injection oil way, energy in the system is converted into potential energy to be stored at proper time, when the system is needed, the potential energy is converted into hydraulic energy and the like to be released, the hydraulic energy is supplied to the system again, and when the instantaneous pressure of the system is increased, the hydraulic energy can absorb the energy to ensure that the pressure of the whole system is normal.
Drawings
FIG. 1 is a schematic diagram of a power constant system capable of automatically adjusting the position of an electrode according to the present invention.
In the figure, 1, an electrode, 2, a current transformer, 3, an isolation transformer, 4, a first rectifier, 5, a second rectifier, 6, a first slide rheostat, 7, a three-position three-way servo valve, 8, a plunger cylinder, 9, a second slide rheostat, 10, a third slide rheostat, 11, a fourth slide rheostat, 12, a first energy accumulator, 13, a first safety valve, 14, an oil tank, 15, a second energy accumulator, 16, a second safety valve, 17, an oil pump, 18 and molten steel are shown.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples.
As shown in fig. 1, a power constant system capable of automatically adjusting the electrode position comprises a current transformer 2 for detecting the current of an electrode 1, an isolation transformer 3 for detecting the voltage of the electrode 1, a first rectifier 4, a second rectifier 5, a first slide rheostat 6, a second slide rheostat 9, a third slide rheostat 10, a fourth slide rheostat 11, a three-position three-way servo valve 7, a plunger cylinder 8, an oil return circuit and an oil injection circuit, wherein the current transformer 2 is sleeved on a connecting wire of the electrode 1, the first rectifier 4 and the second rectifier 5 adopt a full-bridge rectifying circuit, a first output end of the current transformer 2 is respectively connected with a slide end of the second slide rheostat 9, a second end of the second slide rheostat 9 and a first end of the third slide rheostat 10, a second output end of the current transformer 2 is respectively connected with a first end of the second slide rheostat 9 and a second input end of the first rectifier 4, a slide end of the second slide rheostat 9 and a second end of the second rectifier 4 are respectively connected with a first input end of the first rectifier 4, a first output end of the primary coil 3 of the isolation transformer 3 is connected with a second end of the first rectifier 6, a second output end of the second rectifier 6 is respectively connected with a second end of the second rectifier 6, a second end of the primary coil 3 is respectively connected with a second end of the first rectifier 6, and the second end of the second rectifier 6 is respectively connected with a second end of the first rectifier 6, the first end of the fourth slide rheostat 11 is respectively connected with the second output end of the second rectifier 5 and the second end of the first slide rheostat 6, the sliding end and the second end of the fourth slide rheostat 11 are both connected with the second signal input end of the three-position three-way servo valve 7, an oil cavity of the plunger cylinder 8 is connected with the first interface of the three-position three-way servo valve 7, the driving end of the plunger cylinder 8 is connected with an oil return oil path through a cantilever, the second interface of the three-position three-way servo valve 7 is connected with an oil injection oil path, the third interface of the three-position three-way servo valve 7 is connected with an oil cavity and an oil injection oil path of the plunger cylinder 8, the middle position of the three-position three-way servo valve 7 is not conducted, and the right position of the three-position three-way servo valve 7 is connected with the oil cavity and the oil return oil path of the plunger cylinder 8.
The oil return way comprises a first energy accumulator 12 and a first safety valve 13, one end of the first energy accumulator 12 is connected with a second interface of the three-position three-way servo valve 7, the other end of the first energy accumulator 12 is connected with one end of the first safety valve 13, and the other end of the first safety valve 13 is connected with an oil tank 14. The oiling oil way comprises a second energy accumulator 15, a second safety valve 16 and an oil pump 17, one end of the second energy accumulator 15 is respectively connected with a third interface of the three-position three-way servo valve 7 and the output end of the oil pump 17, the other end of the second energy accumulator 15 is connected with one end of the second safety valve 16, and the other end of the second safety valve 16 and the input end of the oil pump 17 are both connected with the oil tank 14. The first energy accumulator 12 and the second energy accumulator 15 convert energy in the system into potential energy to be stored at proper time, when the system is needed, the potential energy is converted into hydraulic energy and the like to be released, the potential energy is supplied to the system again, and when the instantaneous pressure of the system is increased, the potential energy can absorb part of the energy to ensure that the pressure of the whole system is normal.
The working method of the power constant system capable of automatically adjusting the electrode position comprises the following steps:
s1: the sliding end position of the first slide rheostat 6 is adjusted, so that when the current of the electrode 1 and the voltage of the electrode 1 are required values, the voltage difference between the two ends of the first slide rheostat 6 is zero, at the moment, the three-position three-way servo valve 7 is positioned in the middle position, the position of the electrode 1 is not moved, and the balance state of constant power is maintained;
s2: when the three-position three-way servo valve 7 detects that the first end voltage of the first slide rheostat 6 is smaller than the second end voltage, the three-position three-way servo valve 7 is switched to the right position, liquid flow flows into an oil return path from an oil cavity of the plunger cylinder 8 through the three-position three-way servo valve 7 under the action of the dead weight of the motor and the plunger cylinder 8, and the electrode 1 descends along with the driving end of the plunger cylinder 8 until the electrode returns to the balanced state again;
when the three-position three-way servo valve 7 detects that the first end voltage of the first slide rheostat 6 is larger than the second end voltage, the three-position three-way servo valve 7 is switched to the left position, high-pressure liquid flow flows into the oil cavity of the plunger cylinder 8 from the oil filling oil way through the three-position three-way servo valve 7, and the electrode 1 rises along with the driving end of the plunger cylinder 8 until returning to the balance state again.
Taking electric furnace steelmaking as an example, the working principle is as follows: the smelting current and voltage are respectively measured by a current transformer 2 and an isolation transformer 3, the current end potential is respectively reacted at the first end of the first slide rheostat 6 after rectification, the voltage end potential is reacted at the second end of the first slide rheostat 6, and the three-position three-way servo valve 7 compares the two potentials.
When the current and the voltage are the required values, the voltage difference between the two ends of the first slide rheostat 6 is zero, the working position of the three-position three-way servo valve 7 is in the middle position, and the electrode 1 is motionless.
Once the raw materials in the smelting furnace are melted, the liquid level of molten steel 18 is reduced, smelting current is reduced, at the moment, the voltages output by the two groups of rectifiers are unequal, the potentials at two ends of the first slide rheostat 6 are unequal, the signal input to the three-position three-way servo valve 7 is negative current, the valve core moves leftwards, the working position of the three-position three-way servo valve 7 is switched to the right position, and liquid flow flows from the plunger cylinder 8 through the three-position three-way servo valve 7 to the first energy accumulator 12 under the action of the dead weights of the electrode 1 and the plunger cylinder 8 until the electrode 1 is balanced again.
Once the bath is formed in the furnace, the scrap steel collapses downwardly and holds the electrode 1 together to form a short circuit. At this point the arc voltage is 0 and the current increases dramatically. The first slide rheostat 6 has a current-side potential rising and a voltage-side potential falling. At this time, the signal to the three-position three-way servo valve 7 is forward current, the valve core moves rightward, so that the working position of the three-position three-way servo valve 7 is switched to the left position, the oil pump 17 works to form high-pressure liquid flow, the high-pressure liquid flow flows into the plunger cylinder 8 from the second energy accumulator 15, and the electrode 1 is lifted upwards until rebalancing.
Claims (5)
1. The utility model provides a but constant power system of automatically regulated electrode position, its characterized in that, including current transformer (2) that are used for detecting electrode current, be used for detecting electrode voltage's isolation transformer (3), first rectifier (4), second rectifier (5), first slide rheostat (6), three-position tee bend servo valve (7), plunger jar (8), oil return oil circuit and oiling oil circuit, the input of first rectifier (4) is connected to the output of current transformer (2), the input of second rectifier (5) is connected to the output of isolation transformer (3), the first output of first rectifier (4) is connected the first output of second rectifier (5) and the sliding end of first slide rheostat (6) respectively, the second output of first rectifier (4) is connected the first end of first slide rheostat (6) and the first signal input of three-position tee bend servo valve (7) respectively, the second output of second rectifier (5) is connected the first signal input of third end of three-position tee bend servo valve (7) respectively, the three-position servo valve (7) is connected to the three-position servo valve (8) the three-way interface (7), the third interface of the three-position three-way servo valve (7) is connected with an oil injection oil way, the left position of the three-position three-way servo valve (7) is communicated with an oil cavity of the plunger cylinder (8) and the oil injection oil way, the middle position of the three-position three-way servo valve (7) is not communicated, and the right position of the three-position three-way servo valve (7) is communicated with the oil cavity of the plunger cylinder (8) and the oil return oil way;
the working method of the power constant system capable of automatically adjusting the electrode position comprises the following steps:
s1: the sliding end position of the first slide rheostat (6) is adjusted, so that when the electrode current and the electrode voltage are required values, the voltage difference between the two ends of the first slide rheostat (6) is zero, at the moment, the three-position three-way servo valve (7) is positioned in the middle position, the position of the electrode (1) is not moved, and the balance state is maintained;
s2: when the three-position three-way servo valve (7) detects that the voltage of the first end of the first slide rheostat (6) is smaller than the voltage of the second end, the three-position three-way servo valve (7) is switched to the right position, liquid flow flows from an oil cavity of the plunger cylinder (8) into an oil return oil way through the three-position three-way servo valve (7) under the action of the dead weight of the motor and the plunger cylinder (8), and the electrode (1) descends along with the driving end of the plunger cylinder (8) until the state returns to the equilibrium state again;
when the three-position three-way servo valve (7) detects that the voltage of the first end of the first slide rheostat (6) is larger than the voltage of the second end, the three-position three-way servo valve (7) is switched to the left position, high-pressure liquid flow flows into an oil cavity of the plunger cylinder (8) from an oil injection oil way through the three-position three-way servo valve (7), and the electrode (1) rises along with the driving end of the plunger cylinder (8) until the plunger cylinder returns to the balanced state again.
2. The power constant system capable of automatically adjusting the electrode position according to claim 1, further comprising a second sliding rheostat (9) and a third sliding rheostat (10), wherein the first output end of the current transformer (2) is respectively connected with the sliding end of the second sliding rheostat (9), the second end of the second sliding rheostat (9) and the first end of the third sliding rheostat (10), the second output end of the current transformer (2) is respectively connected with the first end of the second sliding rheostat (9) and the second input end of the first rectifier (4), and the sliding end and the second end of the second sliding rheostat (9) are respectively connected with the first input end of the first rectifier (4).
3. The power constant system capable of automatically adjusting the electrode position according to claim 1, further comprising a fourth slide rheostat (11), wherein a first end of the fourth slide rheostat (11) is respectively connected with a second output end of the second rectifier (5) and a second end of the first slide rheostat (6), and a sliding end and a second end of the fourth slide rheostat (11) are respectively connected with a second signal input end of the three-position three-way servo valve (7).
4. The power constant system capable of automatically adjusting the electrode position according to claim 1, wherein the oil return path comprises a first energy accumulator (12) and a first safety valve (13), one end of the first energy accumulator (12) is connected with a second interface of the three-position three-way servo valve (7), the other end of the first energy accumulator (12) is connected with one end of the first safety valve (13), and the other end of the first safety valve (13) is connected with an oil tank (14).
5. The power constant system capable of automatically adjusting the electrode position according to claim 1, wherein the oiling oil way comprises a second energy accumulator (15), a second safety valve (16) and an oil pump (17), one end of the second energy accumulator (15) is respectively connected with a third interface of the three-position three-way servo valve (7) and an output end of the oil pump (17), the other end of the second energy accumulator (15) is connected with one end of the second safety valve (16), and the other end of the second safety valve (16) and an input end of the oil pump (17) are both connected with an oil tank (14).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711060526.9A CN107682950B (en) | 2017-11-02 | 2017-11-02 | Power constant system capable of automatically adjusting electrode position and working method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711060526.9A CN107682950B (en) | 2017-11-02 | 2017-11-02 | Power constant system capable of automatically adjusting electrode position and working method thereof |
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| CN107682950A CN107682950A (en) | 2018-02-09 |
| CN107682950B true CN107682950B (en) | 2023-09-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| IT201800004847A1 (en) * | 2018-04-24 | 2019-10-24 | METHOD OF MELTING IN AN ELECTRIC ARC OVEN AND RELATED EQUIPMENT | |
| CN115173372B (en) * | 2022-07-26 | 2024-09-03 | 广州小鹏汽车科技有限公司 | Short-circuit protection circuit, power battery pack and vehicle |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85202632U (en) * | 1985-07-02 | 1987-02-25 | 天津市冶金实验厂 | Automatic regulator of voltage for hydraulic transmission arc-furnace |
| CN207460536U (en) * | 2017-11-02 | 2018-06-05 | 福州大学 | A kind of power invariability system for automatically adjusting electrode position |
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2017
- 2017-11-02 CN CN201711060526.9A patent/CN107682950B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85202632U (en) * | 1985-07-02 | 1987-02-25 | 天津市冶金实验厂 | Automatic regulator of voltage for hydraulic transmission arc-furnace |
| CN207460536U (en) * | 2017-11-02 | 2018-06-05 | 福州大学 | A kind of power invariability system for automatically adjusting electrode position |
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