Intermediate frequency furnace with furnace leakage alarm function

Abstract

The utility model relates to the technical field of intermediate frequency furnace, concretely is a kind of intermediate frequency furnace with furnace leakage alarm function, including furnace shell, furnace lining, furnace leakage alarm device;Furnace shell is connected with ground wire, and the inside connection furnace lining of furnace shell;The inside of furnace lining is equipped with storage cavity, and the inside of side portion is equipped with alarm net, and the inside of bottom portion is equipped with the bottom probe that extends into storage cavity;Furnace leakage alarm device includes positive test connection terminal and negative test connection terminal, and positive test connection terminal is connected alarm net by wire, and negative test connection terminal is connected bottom probe by wire;Positive test connection terminal is connected with voltmeter by wire, and voltmeter is connected with ground wire by wire;The utility model can judge whether alarm net is grounded according to the reading of voltmeter;After judging alarm net grounding, maintenance is carried out, to avoid the problem of furnace leakage alarm misoperation when pouring molten iron.

Description

Technical Field

[0001] This utility model relates to the field of medium-frequency furnace technology, specifically a medium-frequency furnace with a furnace leakage alarm function. Background Technology

[0002] An intermediate frequency furnace is a device that uses intermediate frequency power as its energy source. It generates high temperatures in metal raw materials through electromagnetic induction heating. In the aluminum electrolysis industry, a key application of intermediate frequency furnaces is the processing and melting of pig iron. Pig iron is used to connect the anode carbon block and the guide rod assembly. The connection point is between the steel claw of the guide rod assembly and the bowl of the carbon block. During use, the side electrode (alarm network) of the intermediate frequency furnace in the aluminum electrolysis anode workshop may become grounded due to improper installation or use. This is not easily detected during normal smelting. However, after smelting, the molten iron needs to be poured into a ladle. When pouring the molten iron, the bottom electrode of the intermediate frequency furnace is connected to the inner wall of the ladle through the molten iron, and also to the outer shell of the ladle through the slag on the edge of the ladle. Finally, it is connected to the trolley through the steel wire rope used to transport the ladle and grounded. With both the bottom electrode and the measuring electrode grounded, the alarm circuit forms a loop. This can lead to false alarms due to furnace leakage and poses a safety hazard of inaccurate detection. Utility Model Content

[0003] The main purpose of this utility model is to provide a medium-frequency furnace with a leakage alarm function, so as to solve the problem that the grounding of the alarm network is not easy to detect in the above-mentioned prior art, and there is a hidden danger of inaccurate safety detection.

[0004] To achieve the above objectives, this utility model provides a medium-frequency furnace with a furnace leakage alarm function, including a furnace shell, a furnace lining, and a furnace leakage alarm device; the furnace shell is connected to a grounding wire, and the furnace lining is connected to the inside of the furnace shell; the furnace lining has a storage cavity inside, an alarm net is provided on the side, and a bottom probe extending into the storage cavity is provided at the bottom; the furnace leakage alarm device includes a positive test terminal and a negative test terminal, the positive test terminal is connected to the alarm net through a wire, and the negative test terminal is connected to the bottom probe through a wire; the positive test terminal is connected to a voltmeter through a wire, and the voltmeter is connected to a grounding wire through a wire.

[0005] Furthermore, the furnace leakage alarm device includes a power supply wire connected to a power source, with a transformer input terminal connected to the power supply wire; a bridge rectifier input terminal connected to the transformer output terminal; the positive output terminal of the bridge rectifier connected to a positive test terminal via test wire one, and the negative output terminal connected to a negative test terminal via test wire two; a relay coil connected to test wire one; alarm wire one and alarm wire two connected in parallel on the power supply wire, with the relay coil and normally open contact of relay one connected to alarm wire one, and alarm wire two connected to alarm light one and normally open contact of relay two.

[0006] Furthermore, test switches are provided on test lead one and test lead two.

[0007] Furthermore, the voltmeter is a Chint PZ7777-6 model voltmeter, and the relay output terminal of the voltmeter is connected to an alarm light via a wire.

[0008] This invention uses a voltmeter to measure the voltage at the positive test terminal when the alarm network is not grounded. The voltage measured is equivalent to the voltage to the ground and is slightly less than the transformer output voltage. When the alarm network is grounded, the voltmeter is short-circuited and measures a voltage of 0-3V. This allows the voltmeter reading to indicate whether the alarm network is grounded. After determining that the alarm network is grounded, repairs can be made to prevent false alarms caused by furnace leakage during molten iron pouring.

[0009] This invention uses a Chint PZ7777-6 voltmeter connected to an alarm light to trigger an alarm when the voltmeter reading is below a set value, indicating a grounding issue in the alarm network. Attached Figure Description

[0010] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0011] Figure 1 This is a schematic diagram of the structure of the medium-frequency furnace with a leakage alarm function in the embodiment; Figure 2 This is a schematic diagram of the furnace leakage alarm device in the embodiment; In the diagram: 1. Furnace shell; 2. Furnace lining; 201. Storage cavity; 3. Alarm network; 4. Bottom probe; 5. Furnace leakage alarm device; 501. Positive test terminal; 502. Negative test terminal; 503. Power supply wire; 504. Transformer; 505. Test switch; 506. Bridge rectifier; 507. Test wire one; 508. Test wire two; 509. Relay one; 5010. Alarm wire one; 5011. Alarm wire two; 5012. Relay two; 5013. Alarm light one; 6. Grounding wire; 7. Voltmeter. Detailed Implementation

[0012] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0013] Example 1 like Figures 1 to 2As shown in the figure, according to an embodiment of the present invention, a medium-frequency furnace with a furnace leakage alarm function is provided, including a furnace shell 1, a furnace lining 2, and a furnace leakage alarm device 5; the furnace shell 1 is made of steel, and a grounding wire 6 is connected to the furnace shell 1, and the furnace lining 2 is connected to the inside of the furnace shell 1; the furnace lining 2 uses refractory ramming material, such as magnesium oxide, quartz sand, etc., which needs to have low electrical conductivity to avoid eddy current loss, and is also resistant to high temperature; the furnace lining 2 has a storage cavity 201 inside, an alarm net 3 inside the side, and a bottom probe 4 extending into the storage cavity 201 inside the bottom, and the materials of the alarm net 3 and the bottom probe 4 are both stainless steel; the furnace leakage alarm device 5 includes a positive test terminal 501 and a negative test terminal 502, the positive test terminal 501 is connected to the alarm net 3 through a wire, and the negative test terminal 502 is connected to the bottom probe 4 through a wire; the positive test terminal 501 is connected to a voltmeter 7 through a wire, and the voltmeter 7 is connected to the grounding wire 6 through a wire.

[0014] The furnace leakage alarm device 5 includes a power supply wire 503 connected to a power source, with the input terminal of a transformer 504 connected to the power supply wire 503; the output terminal of the transformer 504 is connected to the input terminal of a bridge rectifier 506; the transformer 504 transforms the 220V voltage to 36V, and the bridge rectifier 506 converts AC to DC; the positive output terminal of the bridge rectifier 506 is connected to the positive test terminal 501 via test wire one 507, and the negative output terminal of the bridge rectifier 506 is connected to the negative test terminal 502 via test wire two 508; the coil of relay one 509 is connected to test wire one 507; alarm wire one 5010 and alarm wire two 5011 are connected in parallel to the power supply wire 503; the coil of relay two 5012 and the normally open contact of relay one 509 are connected to alarm wire one 5010, and alarm wire two 5011 is connected to alarm light one 5013 and the normally open contact of relay two 5012.

[0015] Test switches 505 are provided on test lead 1 507 and test lead 2 508.

[0016] The measuring principle of the furnace leakage alarm device 5 is: Test lead 1 507 and test lead 2 508 are connected to a low-voltage DC power supply between the alarm network 3 and the bottom probe 4. Under normal conditions, due to the high insulation resistance of the furnace lining 2 material, the alarm network 3 and the bottom probe 4 cannot be connected, resulting in test lead 1 507 and test lead 2 508 failing to form a circuit.

[0017] When the furnace lining 2 is eroded to a certain extent and molten iron penetrates into the alarm mesh 3, the alarm mesh 3 and the bottom probe 4 become conductive, and test wire 1 507 and test wire 2 508 form a circuit. The coil of relay 1 509 is energized, the normally open contact of relay 1 509 closes, and alarm wire 1 5010 becomes conductive. The coil of relay 2 5012 is energized, the normally open contact of relay 2 5012 closes, alarm wire 2 5011 becomes conductive, and alarm light 1 5013 lights up, triggering an alarm.

[0018] The measurement principle of voltmeter 7 is: When alarm network 3 is not grounded, the measured voltage is the voltage at the positive test terminal 501, which is equivalent to the voltage to the ground and is slightly less than the transformer output voltage. When alarm network is grounded, the voltmeter is short-circuited and the measured voltage is 0-3V. Therefore, the voltmeter reading can be used to determine whether alarm network is grounded. After determining that alarm network is grounded, repairs should be carried out to avoid the problem of furnace leakage alarm malfunction when pouring molten iron.

[0019] Example 2 Voltmeter 7 is a Chint PZ7777-6 model voltmeter. The relay output terminal of voltmeter 7 is connected to alarm light 2 via a wire.

[0020] By configuring a Chint PZ7777-6 voltmeter and connecting it to alarm light two, an alarm can be triggered when the voltmeter reading falls below a set value, indicating a grounding issue in the alarm network.

[0021] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A medium-frequency furnace with a furnace leakage alarm function, comprising a furnace shell (1), a furnace lining (2), and a furnace leakage alarm device (5); the furnace shell (1) is connected to a grounding wire (6), and the furnace lining (2) is connected inside the furnace shell (1); the furnace lining (2) has a storage cavity (201) inside, an alarm net (3) inside the side, and a bottom probe (4) extending into the storage cavity (201) inside the bottom; characterized in that, The furnace leakage alarm device (5) includes a positive test terminal (501) and a negative test terminal (502). The positive test terminal (501) is connected to the alarm network (3) through a wire, and the negative test terminal (502) is connected to the bottom probe (4) through a wire. The positive test terminal (501) is connected to a voltmeter (7) through a wire, and the voltmeter (7) is connected to a grounding wire (6) through a wire.

2. The medium-frequency furnace with leakage alarm function as described in claim 1, characterized in that, The furnace leakage alarm device (5) includes a power supply wire (503) connected to a power source, and the input terminal of a transformer (504) is connected to the power supply wire (503); the output terminal of the transformer (504) is connected to the input terminal of a bridge rectifier (506); the positive output terminal of the bridge rectifier (506) is connected to the positive test terminal (501) through test wire one (507), and the negative output terminal of the bridge rectifier (506) is connected to the negative test terminal (501) through test wire two (508). Test terminal (502); the coil of relay one (509) is connected to the test lead one (507); the power supply lead (503) is connected in parallel with alarm lead one (5010) and alarm lead two (5011), the coil of relay two (5012) and the normally open contact of relay one (509) are connected to the alarm lead one (5010), and the normally open contact of alarm lead two (5011) is connected to alarm light one (5013) and relay two (5012).

3. The medium-frequency furnace with leakage alarm function as described in claim 2, characterized in that, Test switches (505) are provided on the test lead one (507) and test lead two (508).

4. The medium-frequency furnace with leakage alarm function as described in claim 1, characterized in that, The voltmeter (7) is a Chint PZ7777-6 model voltmeter, and the relay output terminal of the voltmeter (7) is connected to an alarm light 2 via a wire.

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