Intermediate frequency furnace insulation detection device

Abstract

The application is suitable for the technical field of metallurgical industry, and provides an intermediate frequency furnace insulation detection device, which comprises: an intermediate frequency furnace induction coil, a power input end of which is electrically connected with an alternating current power supply, and a power output end of which is fixedly connected with a ground insulation resistance and connected with the ground; a detection circuit, which has: a current output device for stably outputting a detection direct current, a power output end of which is connected with the power input end of the intermediate frequency furnace induction coil, and a power input end of which is connected with the power output end of the intermediate frequency furnace induction coil; and a collection component for realizing insulation detection of the intermediate frequency furnace induction coil, adopting a direct current injection technology to detect ground insulation data of the furnace body, so that the insulation condition of the running equipment (the intermediate frequency furnace induction coil and the ground insulation resistance) can be timely mastered, and the safety operation of the intermediate frequency furnace is provided with protection and basis, and a major safety accident of turn-to-turn sparking of the intermediate frequency furnace induction coil and burning of the intermediate frequency furnace induction coil caused by insulation problems is avoided.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of metallurgical industry, and particularly relates to an insulation detection device for a medium-frequency furnace. BACKGROUND

[0002] The medium-frequency furnace is a smelting equipment for steelmaking and casting, which generates a medium-frequency power source through rectification inversion, and a medium-frequency current generates a medium-frequency electromagnetic field in the furnace body (coil), so that eddy current is generated in the metal in the furnace body, and a large amount of heat energy is generated by the eddy current to melt the metal.

[0003] The structure of the medium-frequency furnace is that an induction coil and a crucible made of refractory material in the induction coil are used to contain smelting metal, and the induction coil has a high insulation resistance to the ground through the refractory material during operation, and the insulation performance is reduced, which leads to turn-to-turn sparking and electric leakage damage to the induction coil, causes a fault, and the equipment cannot be normally operated. SUMMARY

[0004] The present application provides an insulation detection device for a medium-frequency furnace, and aims to solve the problems in the background art.

[0005] The present application is implemented as follows: the insulation detection device for the medium-frequency furnace comprises: a medium-frequency furnace induction coil, a power input end of which is electrically connected with an alternating current power source, and a power output end of which is fixedly connected with a ground insulation resistance and connected with the ground; a detection circuit, which has: a current output device for stably outputting a detection direct current, a power output end of which is connected with the power input end of the medium-frequency furnace induction coil, and a power input end of which is connected with the power output end of the medium-frequency furnace induction coil; and a collection component, which is arranged between the power input end of the current output device and the power output end of the medium-frequency furnace induction coil, and is used to realize insulation detection of the medium-frequency furnace induction coil.

[0006] Preferably, the detection component further comprises: a series reactance, which is arranged between the power output end of the current output device and the power input end of the medium-frequency furnace induction coil, and has high impedance to high-voltage current in the alternating current power source, so as to limit the alternating current power source from being delivered into the detection circuit; a current-limiting resistance, which is arranged between the power input end of the current output device and the power output end of the medium-frequency furnace induction coil, and is used to limit the voltage of the alternating current power source, so as to realize protection of the collection component; and a fuse tube, which is arranged between the power output end of the current output device and the power input end of the medium-frequency furnace induction coil, and is used to protect the current output by the current output device.

[0007] Preferably, the acquisition component comprises: an acquisition resistor arranged between the power input end of the current output device and the power output end of the intermediate frequency furnace induction coil, and a detection module connected to the acquisition resistor and configured to convert the detection current output by the current output device into a voltage signal and to process, calculate and display the received voltage signal.

[0008] Preferably, the detection module comprises: a current signal sampling unit configured to convert the detection current output by the current output device into a voltage signal, a signal processing unit configured to filter the acquired voltage signal into an AC signal and a DC signal, eliminate interference signals in the AC power supply, a calculation unit configured to calculate the detection signal containing only the DC voltage signal of the current output device after elimination, and a signal output unit configured to output the result obtained after calculation to an external display device.

[0009] Preferably, the detection module further comprises an alarm unit electrically connected to an external alarm device, and when the detection data result output by the signal output unit is higher than the comparison data stored in the detection module in advance, the alarm unit controls the external alarm device to generate an alarm signal.

[0010] Preferably, the alarm signal can be one or a combination of the following: a sound source alarm signal, a light source alarm signal and a vibration alarm signal.

[0011] Preferably, the detection module further comprises a control module, and an air switch is arranged at the power input end of the intermediate frequency furnace induction coil and electrically connected to the control module, and when the detection data result output by the signal output unit is higher than the comparison data stored in the detection module in advance, the control module controls the air switch to cut off the AC power supply.

[0012] Compared with the prior art, the intermediate frequency furnace insulation detection device has the following advantages:

[0013] The intermediate frequency furnace insulation detection device comprises a topology circuit composed of a series reactance, a current-limiting resistor, a sampling resistor, a DC power supply (a current output device) and a detection circuit, and has the functions of preventing interference of intermediate frequency AC signals and accurately collecting and measuring DC insulation signals.

[0014] The DC injection technology is used to detect the ground insulation data of the furnace body, so that the insulation condition of the running equipment (the intermediate frequency furnace induction coil and the ground insulation resistor) can be grasped in time, and the safety and basis for the operation of the intermediate frequency furnace are provided, and the major safety accidents of the intermediate frequency furnace induction coil turn-to-turn sparking and burning of the intermediate frequency furnace induction coil caused by insulation problems are avoided. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a schematic diagram of another embodiment of the present application;

[0016] Figure 2 is a schematic diagram of another embodiment of the present application;

[0017] Figure 3 is a schematic diagram of the structure of the collection component in the present application;

[0018] Figure 4 is a calculation formula diagram of the loop current signal IRx in the insulation detection principle in the present application;

[0019] Figure 5 is a calculation formula diagram of the sampling resistance RX insulation voltage signal VRx in the insulation detection principle in the present application;

[0020] in the figure:

[0021] 1, intermediate frequency furnace induction coil;

[0022] 2, ground insulation resistance;

[0023] 3, detection circuit; 31, current output device; 32, collection component; 321, collection resistance; 322, detection module; 3221, current signal sampling unit; 3222, signal processing unit; 3223, calculation unit; 3224, signal output unit; 33, series reactance; 34, current limiting resistance; 35, fuse tube;

[0024] 4, air switch. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the present application more clear and understandable, the present application will be further described in detail below in combination with the drawings and examples, and it should be understood that the specific examples described here are only used to explain the present application, and are not used to limit the present application.

[0026] Please refer to Figures 1-3 , the present application provides a technical scheme,

[0027] The intermediate frequency furnace insulation detection device comprises: an intermediate frequency furnace induction coil 1, a power input end of which is electrically connected with an alternating current power supply, and a power output end of which is fixedly connected with a ground insulation resistance 2 and connected with the ground; and a detection circuit 3, which has: a current output device 31 for stably outputting a detection direct current, a power output end of which is connected with the power input end of the intermediate frequency furnace induction coil 1, and a power input end of which is connected with the power output end of the intermediate frequency furnace induction coil 1; and a collection component 32, which is arranged between the power input end of the current output device 31 and the power output end of the intermediate frequency furnace induction coil 1, and is used for realizing insulation detection of the intermediate frequency furnace induction coil 1.

[0028] The detection circuit 3 further comprises: a series reactance 33, which is arranged between the power output end of the current output device 31 and the power input end of the intermediate frequency furnace induction coil 1, and has high impedance to high voltage current in the alternating current power supply, so as to limit the alternating current power supply from being transmitted into the detection circuit 3; a current limiting resistor 34, which is arranged between the power input end of the current output device 31 and the power output end of the intermediate frequency furnace induction coil 1, and is used to limit the voltage of the alternating current power supply, so as to realize protection of the acquisition component 32; and a fuse tube 35, which is arranged between the power output end of the current output device 31 and the power input end of the intermediate frequency furnace induction coil 1, and is used to protect the current output by the current output device 31;

[0029] The acquisition component 32 comprises: an acquisition resistor 321, which is arranged between the power input end of the current output device 31 and the power output end of the intermediate frequency furnace induction coil 1; and a detection module 322, which is signal connected to the acquisition resistor 321, and is used to convert the detection current output by the current output device 31 into a voltage signal, and is used to process, calculate and display the received voltage signal.

[0030] The detection module 322 comprises: a current signal sampling unit 3221, which is used to convert the detection current output by the current output device 31 into a voltage signal; a signal processing unit 3222, which is used to filter the acquired voltage signal into an alternating current signal and a direct current signal, eliminate the interference signal in the alternating current power supply, and calculate the detection signal containing only the direct current voltage signal of the current output device 31; a calculation unit 3223, which is used to calculate the detection signal; and a signal output unit 3224, which is used to output the result obtained after the calculation to an external display device.

[0031] Specifically, the power input end of the intermediate frequency furnace induction coil 1 is connected to the alternating current power supply (public network power), and the alternating current is transmitted by the alternating current power supply to ensure the normal work of the intermediate frequency furnace induction coil 1. The power output end of the intermediate frequency furnace induction coil 1 is also connected to the ground through a connecting wire, so as to ensure the release of the current. In addition, a ground insulation resistor 2 is fixedly installed on the connecting wire, so as to ensure the normal operation of the intermediate frequency furnace induction coil 1.

[0032] It should be understood that, in the embodiment, in order to detect the resistance performance of the intermediate frequency furnace induction coil 1 and the ground insulation resistor 2, the detection circuit 3 is connected to the power input end and the power output end of the intermediate frequency furnace induction coil 1, and the detection circuit 3 comprises a current output device 31 (outputting a detection direct current power supply), an acquisition component 32 (having a built-in detection module 322, and realizing signal detection of the direct current power supply), a series reactance 33 (ensuring that the alternating current power supply does not interfere with the detection of the direct current), a current limiting resistor 34 (preventing the alternating current power supply from flowing into the detection circuit 3), a fuse tube 35 (protecting the current output device 31), and the intermediate frequency furnace induction coil 1 and the ground insulation resistor 2 form a closed insulation detection loop.

[0033] The direct current power output by the current outputter 31 flows back to the collection component 32 through the intermediate frequency furnace induction coil 1 and the ground insulation resistance 2. The collection resistance 321 collects the current, and the current signal sampling unit 3221 converts the detected current sampled by the collection resistance 321 into a voltage signal and transmits the voltage signal to the signal processing unit 3222. The signal processing unit 3222 screens the interference signals of the alternating current power and the direct current power, retains the signal of the direct current power, and transmits the signal to the calculation unit 3223. The calculation unit 3223 processes and calculates the voltage signal, and after the calculation is completed, the voltage signal is transmitted to the signal output unit 3224. The signal output unit 3224, which is electrically connected to the display device (which can be a display screen or a component with a digital display) in the external environment, displays the signal output, facilitating observation at the first time.

[0034] As shown in Figure 4 and Figure 5 , Figure 4 is a calculation formula of the loop current signal IRx in the insulation detection principle, Figure 5 is a calculation formula of the sampling resistance RX insulation voltage signal VRx, wherein R is a current-limiting resistance, RL is a reactance direct current resistance, Rx is a sampling resistance, and Rn is an insulation resistance;

[0035] The insulation resistance Rn is reduced to make the insulation voltage signal VRx rise. The insulation resistance data is processed, calculated, and displayed according to the change of the insulation detection voltage signal VRx extracted by the sampling resistance, and the insulation resistance exceeds the set value to alarm.

[0036] In addition, the detection module 322 is also provided with an alarm unit which is electrically connected to the external alarm device. When the detection data result output by the signal output unit 3224 is higher than the comparison data stored in the detection module 322 in advance, the alarm unit controls the external alarm device to generate an alarm signal.

[0037] The alarm signal can be one or a combination of the following: a sound source alarm signal, a light source alarm signal, and a vibration alarm signal.

[0038] Specifically, the detection module 322 is also preferably provided with a storage module which stores the pre-set insulation detection data. The signal output by the signal output unit 3224 is compared with the detection data in the storage module. If the detection data is within the threshold range, no alarm will be issued. If the detection data exceeds the threshold range, the alarm unit is triggered, the alarm unit works, and the sound source alarm, the light source alarm, or the vibration alarm is transmitted to the external environment, prompting the staff and maintenance personnel to check and repair at the first time.

[0039] In addition, the detection module 322 is further provided with a control module, an air switch 4 is arranged at the power input end of the intermediate frequency furnace induction coil 1 and is electrically connected, when the detection data result output by the signal output unit 3224 is higher than the comparison data pre-stored in the detection module 322, the control module controls the air switch 4 to cut off the alternating current power supply.

[0040] Specifically, when the alarm module triggers the work, the control module will control the air switch 4 to be closed, which will preferably cut off the alternating current power supply output to the intermediate frequency furnace induction coil 1, stop the work of the intermediate frequency furnace induction coil 1, and timely avoid the major safety accidents caused by the turn-to-turn firing of the intermediate frequency furnace induction coil 1 due to insulation problems.

[0041] The working principle and use process of the present application are as follows:

[0042] The direct current power output by the current output device 31 flows back to the collection component 32 through the intermediate frequency furnace induction coil 1 and the ground insulation resistance 2, the collection resistance 321 collects the current, the current signal sampling unit 3221 converts the detection current sampled by the collection resistance 321 into a voltage signal and transmits it to the signal processing unit 3222, the signal processing unit 3222 screens the interference signals of the alternating current power supply and the direct current power supply, retains the signal of the direct current power supply and transmits it to the calculation unit 3223, the calculation unit 3223 processes and operates the voltage signal, after the operation is completed, the signal is transmitted to the signal output unit 3224, the signal output unit 3224 is electrically connected with the external display device (which can be a display screen or a component with digital display) and displays the signal output, so that the observation can be performed in the first time.

[0043] The above only describes the preferred embodiment of the present application and should not be used to limit the present application, any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An insulation testing device for a medium-frequency furnace, characterized in that, include: The induction coil (1) of the medium frequency furnace has its power input terminal electrically connected to an AC power source, and its power output terminal is fixedly connected to a ground insulation resistor (2) and connected to the ground; the detection circuit (3) has: a current output device (31) for stably outputting DC power for detection, the power output terminal of which is connected to the power input terminal of the induction coil (1) of the medium frequency furnace, and the power input terminal of which is connected to the power output terminal of the induction coil (1) of the medium frequency furnace; a data acquisition component (32) is disposed between the power input terminal of the current output device (31) and the power output terminal of the induction coil (1) of the medium frequency furnace, and is used to realize the insulation detection of the induction coil (1) of the medium frequency furnace; the detection circuit (3) also includes: a series reactor. (33), which is located between the power output terminal of the current output device (31) and the power input terminal of the medium frequency furnace induction coil (1), and has high impedance to high voltage current in AC power supply, so as to limit the AC power supply to be delivered to the detection line (3); current limiting resistor (34), which is located between the power input terminal of the current output device (31) and the power output terminal of the medium frequency furnace induction coil (1), and is used to limit the voltage of AC power supply, so as to protect the acquisition component (32); fuse tube (35), which is located between the power output terminal of the current output device (31) and the power input terminal of the medium frequency furnace induction coil (1), and is used to protect the current output by the current output device (31).

2. The medium-frequency furnace insulation testing device as described in claim 1, characterized in that, The acquisition component (32) includes: an acquisition resistor (321), which is disposed between the power input terminal of the current output device (31) and the power output terminal of the induction coil (1) of the medium frequency furnace; and a detection module (322), which is connected to the acquisition resistor (321) and is used to convert the detection current output by the current output device (31) into a voltage signal, and to process, calculate and display the received voltage signal.

3. The medium-frequency furnace insulation testing device as described in claim 2, characterized in that, The detection module (322) includes: a current signal sampling unit (3221) for converting the detection current output by the current output device (31) into a voltage signal; a signal processing unit (3222) for filtering the collected voltage signal into AC and DC signals to eliminate interference signals in the AC power supply; a calculation unit (3223) for performing calculations on the detection signal that contains only the DC voltage signal from the current output device (31) after elimination; and a signal output unit (3224) for outputting the result obtained after calculation to an external display device.

4. The medium-frequency furnace insulation testing device as described in claim 3, characterized in that, The detection module (322) is also equipped with an alarm unit, which is electrically connected to an external alarm device. When the detection data result output by the signal output unit (3224) is higher than the comparison data pre-stored in the detection module (322), the alarm unit controls the external alarm device to generate an alarm signal.

5. The medium-frequency furnace insulation testing device as described in claim 4, characterized in that, The alarm signals mentioned above can be one or more combinations of sound source alarm signals, light source alarm signals, and vibration alarm signals.

6. The medium-frequency furnace insulation testing device as described in claim 3, characterized in that, The detection module (322) is also equipped with a control module. An air switch (4) is provided at the power input terminal of the induction coil (1) of the medium frequency furnace, and is electrically connected. When the detection data result output by the signal output unit (3224) is higher than the comparison data stored in the detection module (322) in advance, the control module controls the air switch (4) to cut off the AC power.

Images