Electrode centering detection and shunting detection device in smelting process of gas protection electroslag furnace

Abstract

The utility model discloses an electrode centering detection and shunting detection device in the smelting process of a gas protection electroslag furnace. The electrode centering detection and shunting detection device comprises an electrode centering detection unit, a shunting detection unit and an alarm unit, the electrode centering detection unit comprises a plurality of supports (10), pull rope encoders (11) connected with the alarm unit are arranged on the supports (10), positioning pins (12) are connected to pull ropes of the pull rope encoders (11), springs (13) are arranged between the positioning pins (12) and shells of the pull rope encoders (11), and insulating sleeves (14) are arranged on the outer sides of the positioning pins (12). The shunting detection unit comprises an insulation pad (20) and a current transformer (21) connected with the alarm unit. The device has the advantages that safety accidents can be avoided, the inner wall of the crystallizer can be prevented from being damaged, and the qualification rate of electroslag ingots can be improved.

Description

Technical Field

[0001] This utility model belongs to the field of gas-supported electroslag furnace, and particularly relates to an electrode alignment detection and shunting detection device in the gas-supported electroslag furnace smelting process. Background Technology

[0002] The existing structure of gas-insulated electroslag furnace, such as Figure 3 As shown, the system includes a bottom water tank 40, a tubular crystallizer 41 at the top of the bottom water tank 40, a sealing cover 42 at the top of the crystallizer 41, and an electrode 43 at the upper part of the crystallizer 41. The electrode 43 is welded and fixed to a dummy electrode 44, with the upper end of the dummy electrode 44 extending out of the cover 42. The working principle is as follows: slag is fed into the crystallizer 41, and the current output from one end of the power supply 45 returns to the other end of the power supply 45 through the electrode 43, the slag, and the bottom water tank 40, forming a circuit. The slag is first melted to form a slag pool 46, where a large amount of heat is generated to melt the electrode 43. The bottom of the electrode 43 is melted layer by layer by the heat from the slag pool and drips into the crystallizer to solidify into an ingot 47. Molten steel remains between the slag pool 46 and the ingot 47.

[0003] In actual production, it has been found that the electrode and crystallizer may come into contact, causing sparking and potentially damaging the crystallizer, leading to a safety accident. The main reason for this contact is that during the melting process, the electrode continuously moves downwards as it melts. During this downward movement, the electrode may become misaligned. Influenced by the taper of the electrode and crystallizer, as well as the straightness of the weld, contact is more likely to occur when the filling ratio is large (the gap between the electrode and crystallizer is small). Furthermore, workers cannot observe the specific condition of the electrode during the melting process and cannot take timely measures to prevent accidents.

[0004] Furthermore, since the crystallizer also has a certain degree of conductivity, current shunting occurs during the melting process. Under normal circumstances, such as... Figure 4 As shown, the current begins to split at the slag pool location, with a portion of the current diverted from the slag pool and flowing directly to the bottom water tank via the crystallizer. In abnormal conditions, such as... Figure 5 As shown, an additional portion of the current in the crystallizer may branch off at the ingot location, flowing through the ingot to the bottom water tank. This abnormal current shunting causes arcing between the crystallizer and the ingot, damaging the inner wall of the crystallizer and resulting in defects in the final electroslag ingot, leading to substandard quality. Existing gas-supported electroslag furnaces cannot detect abnormal current shunting, making it difficult for workers to address the issue promptly, resulting in easy damage to the inner wall of the crystallizer and defects in the obtained electroslag ingot. Utility Model Content

[0005] The utility model discloses a purpose at, provide a kind of electrode centering detection and shunt detection device in gas shielded electroslag furnace smelting process.The utility model has the advantages of can avoid safety accident, can avoid crystallizer inner wall damage and can improve the qualified rate of electroslag ingot.

[0006] The utility model discloses a technical scheme: a kind of electrode centering detection and shunt detection device in gas shielded electroslag furnace smelting process, including electrode centering detection unit, shunt detection unit and alarm unit;Electrode centering detection unit includes multiple supports, support is equipped with the pull cord encoder of connecting alarm unit, pull cord encoder is connected with the locating pin on pull cord, spring is equipped between the locating pin and the shell of pull cord encoder, the outside of locating pin is equipped with insulating sleeve;Shunt detection unit includes insulating pad and the current transformer of connecting alarm unit.

[0007] The aforementioned electrode centering detection and shunt detection device in gas shielded electroslag furnace smelting process, the alarm unit includes controller, display and alarm are connected on controller, pull cord encoder and current transformer are connected with controller.

[0008] The aforementioned electrode centering detection and shunt detection device in gas shielded electroslag furnace smelting process, the support has four.

[0009] Compared with prior art, the utility model uses on gas shielded electroslag furnace, after being installed to gas shielded electroslag furnace, locating pin contacts false electrode, when electrode is deflected, false electrode is correspondingly deflected, locating pin occurs axial displacement, so that pull wire sensor generates signal, and controller can know the offset of electrode according to the signal sent by pull wire sensor, can send early warning in time after electrode is offset to a certain degree, so that worker can take corresponding measures in time, avoid electrode and crystallizer touch, effectively avoid the generation of safety accident.

[0010] Insulating pad can separate crystallizer and bottom water tank, after being connected in series between current transformer and bottom water tank and crystallizer, the current arriving bottom water tank from crystallizer must pass through current transformer, and the current shunt of current transformer can be detected to be abnormal, so that worker can take corresponding measures in time, avoid crystallizer inner wall damage and improve the qualified rate of electroslag ingot.

[0011] The utility model has the advantages of can avoid safety accident, can avoid crystallizer inner wall damage and can improve the qualified rate of electroslag ingot. ACCURACY

[0012] Figure 1 It is the structure schematic diagram when the utility model is applied to gas shielded electroslag furnace.

[0013] Figure 2 It is the electric control principle diagram of the utility model.

[0014] Figure 3 It is the structure schematic diagram of prior art gas shielded electroslag furnace.

[0015] Figure 4 This is a schematic diagram of normal current shunting.

[0016] Figure 5 This is a schematic diagram of an abnormal current shunting.

[0017] The labels in the attached diagram are as follows: 10-bracket, 11-wire encoder, 12-positioning pin, 13-spring, 14-insulating sleeve; 20-insulating pad, 21-current transformer; 30-controller, 31-display, 32-alarm; 40-bottom water tank, 41-crystallizer, 42-cover, 43-electrode, 44-dummy electrode, 45-power supply, 46-slag pool, 47-ingot. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0019] Example. A device for detecting electrode alignment and current shunting during the gas-supported electroslag furnace smelting process, in such a case... Figure 3 This is used in the gas-supported electroslag remelting furnace shown. The gas-supported electroslag remelting furnace includes a bottom water tank 40, a tubular crystallizer 41 at the top of the bottom water tank 40, a sealing cover 42 at the top of the crystallizer 41, and an electrode 43 at the upper part of the crystallizer 41. The electrode 43 is welded and fixed to a dummy electrode 44, with the upper end of the dummy electrode 44 extending out of the cover 42. The working principle is as follows: slag is fed into the crystallizer 41. Current output from one end of the power supply 45 flows through the electrode 43, the slag, and the bottom water tank 40 back to the other end of the power supply 45, forming a circuit. The slag is first melted to form a slag pool 46. A large amount of heat is generated in the slag pool to melt the electrode 43. The bottom of the electrode 43 is melted layer by layer by the heat from the slag pool and drips into the crystallizer to solidify into an ingot 47. Molten steel is maintained between the slag pool 46 and the ingot 47.

[0020] Devices such as Figure 1 and Figure 2 As shown, it includes an electrode alignment detection unit, a shunt detection unit, and an alarm unit.

[0021] The electrode centering detection unit comprises four supports 10 which are evenly distributed on the outer sidewall of the cover 42 in the circumferential direction, and the supports 10 are fixed with the cover 42. A pull rope encoder 11 is arranged on the support 10, a positioning pin 12 is connected to the pull rope of the pull rope encoder 11, a spring 13 is arranged between the positioning pin 12 and the shell of the pull rope encoder 11, the pre-tightening force of the spring 13 given to the positioning pin 12 is greater than the pulling force of the pull rope encoder 11 given to the positioning pin 12, and an insulating sleeve 14 is arranged on the outer side of the positioning pin 12. A hole is formed in the sidewall of the cover 42, and the insulating sleeve 14 is fixed in the hole. Under the elastic force of the spring 13, the inner side end of the positioning pin 12 abuts against the sidewall of the dummy electrode 44, and the positioning pin 12 is horizontally arranged and can move axially in the insulating sleeve 14.

[0022] The shunt detection unit comprises an insulating pad 20 and a current transformer 21. The insulating pad 20 is arranged between the bottom water tank 40 and the crystallizer 41, so that there is no direct electrical connection between the bottom water tank 40 and the crystallizer 41. The insulating pad 20 can be made of a coiled asbestos rope. The current transformer 21 is connected in series between the bottom water tank 40 and the bottom of the crystallizer 41, so that the shunt current flowing from the crystallizer 41 to the bottom water tank 40 must pass through the current transformer 21.

[0023] The alarm unit can be away from the gas-protected electroslag furnace. The alarm unit comprises a controller 30, which can be a Mitsubishi FX1S PLC, a Mitsubishi FX3U / FX3G or a Siemens S7-1200 PLC. The controller 30 is connected with a display 31 and an audible and visual alarm 32, and the pull rope encoder 11 and the current transformer 21 are connected to the corresponding input ports of the controller 30. The specific wiring mode can be referred to the instruction manual of the controller.

[0024] Taking the Mitsubishi FX1S PLC as an example, an RS-422 communication interface is provided. If the display 31 supports the RS-422 interface, the corresponding data lines can be directly connected. If the display 31 does not support the RS-422 interface, a corresponding communication expansion board or converter needs to be used. The Mitsubishi FX1S PLC has a relay output port, and the alarm 32 is connected to the relay output port. When the selected pull rope encoder 11 is compatible with the input module of the FX1S PLC, the output end of the pull rope encoder 11 can be directly connected to the corresponding input port of the Mitsubishi FX1S PLC. Otherwise, the pull rope encoder 11 needs to be connected through a converter. When the selected current transformer 21 outputs an analog current signal, the output end of the current transformer is connected to the analog input terminal of the PLC. When the selected current transformer 21 outputs a pulse signal, the current transformer is connected to the high-speed counting input terminal of the PLC.

[0025] Working principle: when the electrode 43 is deflected, the dummy electrode 44 is correspondingly deflected, in the deflection direction of the dummy electrode 44, the corresponding positioning pin 12 moves outward, and the positioning pin 12 in the opposite direction moves inward, so that the corresponding pull rope encoder 11 generates a signal, the signal is output to the controller 30, the controller 30 obtains the deflection amount of the electrode 43, and outputs the deflection amount to the display 31, when the deflection amount reaches a certain value, the electrode 43 is too close to the inner wall of the crystallizer 41, the controller 30 starts the alarm 32 and sends a warning message, so that the worker can take timely measures.

[0026] The current passing through the crystallizer 41 to the bottom water tank 40 is detected in real time by the current transformer 21, and the controller 30 outputs the current value to the display 31 for real-time monitoring by the worker. When the current value changes and exceeds a certain amplitude, it indicates that abnormal shunt occurs, the controller 30 starts the alarm 32 and sends a warning message, so that the worker can take timely measures.

Claims

1. A device for electrode centering detection and shunt detection in a gas-protected electroslag furnace smelting process, characterized in that: The electrode pair center detection unit, the shunt detection unit and the alarm unit are included; the electrode pair center detection unit includes a plurality of supports (10), the support (10) is provided with a pull rope encoder (11) connected with the alarm unit, the pull rope of the pull rope encoder (11) is connected with a positioning pin (12), a spring (13) is arranged between the positioning pin (12) and the shell of the pull rope encoder (11), and the outer side of the positioning pin (12) is provided with an insulating sleeve (14); the shunt detection unit includes an insulating pad (20) and a current transformer (21) connected with the alarm unit.

2. The apparatus for electrode centering and shunting detection of a gas-protected electroslag furnace smelting process according to claim 1, characterized in that: The alarm unit includes a controller (30), the controller (30) is connected with a display (31) and an alarm (32), and the pull rope encoder (11) and the current transformer (21) are connected with the controller (30).

3. The apparatus for electrode centering and shunting detection of a gas-protected electroslag furnace smelting process according to claim 1, characterized in that: The support (10) has four.

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