Device and method for monitoring the height of gas-slag interface in soil bin of composite shield machine

Abstract

The invention relates to a monitoring device and method for the height of a gas-slag interface in a soil bin of a composite shield machine, comprising a sensor and a connector installed in a soil bin partition; the sensor comprises an alloy panel and an insulating bottom plate overlapped with the alloy panel; a plurality of metal electrodes arranged in a cross are arranged on the alloy panel; a plurality of metal slots are embedded in the middle of the insulating bottom plate; a plurality of No. I wires connect the corresponding metal electrodes and one end of the metal slot close to the alloy panel; the connector is an insulator with a plurality of metal needles passing therethrough, and the outer ring of the insulator has an external thread for fixing on the soil bin partition; one end of the metal needle is inserted into the metal slot; after the metal slot is connected to the metal needle of the connector, the joint between the alloy panel and the soil bin partition is welded and sealed to fix the sensor; the other end of the metal needle is externally connected to a resistance detection and analysis device through a No. II wire; the resistance detection and analysis device detects the resistivity of the medium in the soil bin through the metal electrode, displays the measured resistivity, and analyzes and prompts the relative height of the gas-slag interface.

Description

Technical Field

[0001] The invention relates to the field of shield construction technology and equipment, and in particular to a device and method for monitoring the height of a gas-slag interface in a soil bin of a composite shield machine. Background Art

[0002] In the existing shield construction of underground tunnel projects in China, due to the complex and diverse geology, there are many types of shield machines, and the earth pressure balance shield machine is the most commonly used one. In the construction of water-bearing weathered layers, the use of earth pressure balance composite shield machines for excavation is currently the most efficient excavation method. The earth pressure balance composite shield machine uses air pressure assisted mode for excavation. In this excavation mode, the slag interface height needs to be reduced as much as possible, but the slag interface height must not be lower than one-third of the shield machine soil bin height. Therefore, the air-slag interface height needs to be monitored in real time during the shield machine excavation process.

[0003] At present, the height of the gas-slag interface is mainly observed indirectly by monitoring the soil pressure distribution in the shield machine's soil bin. Among them, one conventional method is to judge based on the readings of soil pressure gauges pre-buried at different heights in the shield machine's soil bin. The soil pressure gauges used in this method are prone to inaccuracy due to long-term impact by compressed slag soil; another conventional method is to add monitoring holes in the upper half of the shield machine's partition cabin and connect an external mechanical air pressure gauge. This method requires special operators to take pressure readings outside the shield machine's partition cabin, which is inconvenient in actual operation.

[0004] In the prior art, Chinese patent No. CN103912279 discloses a device for judging whether the earth bin of an earth pressure balance shield is full. The device is installed on the top of the earth bin. When the earth bin is half-excavated, the device cannot obtain the height of the gas-slag interface in the earth bin, and has limitations in use. Chinese patent No. CN105068128 introduces a three-dimensional induced polarization advance prediction system and detection method, which is used to detect the stratum conditions in front of the cutterhead but cannot measure the height of the gas-slag interface in the earth bin.

[0005] In summary, in order to further improve the safety of shield construction and effectively guide the control of tunneling construction, a simple and fast gas-slag interface height sensing and monitoring device that will not affect the normal shield tunneling is needed. Summary of the invention

[0006] In order to solve the above-mentioned problems in the prior art, the present invention provides a monitoring device and method for the height of the gas-slag interface in the soil bin of a composite shield machine. The device and method mainly utilize the significant difference in resistivity between the water-containing slag and the air in the soil bin, and obtain the height of the gas-slag interface by real-time monitoring, calculating and analyzing the changes in resistivity at a specific height in the soil bin, thereby providing accurate reference information for the excavation control of the composite shield machine.

[0007] The technical solution of the present invention is as follows:

[0008] A monitoring device for the height of the gas-slag interface in the soil bin of a composite shield machine comprises a sensor and a connector installed in the soil bin partition; the sensor comprises an alloy panel and an insulating base plate overlapped with the alloy panel; a plurality of metal electrodes arranged in a cross are arranged on the alloy panel; a plurality of metal slots are embedded in the middle of the insulating base plate; a plurality of No. Ⅰ wires connect the corresponding metal electrodes with one end of the metal slot close to the alloy panel; the connector is an insulator with a plurality of metal needles passing through it, and the outer ring of the insulator has an external thread to be fixed on the soil bin partition; one end of the metal needle is inserted into the metal slot to connect the connector with the metal electrode on the sensor; after the metal slot is connected to the metal needle of the connector, the joint between the alloy panel and the soil bin partition 1 is welded and sealed to fix the sensor and prevent the material in the soil bin from flowing into the sensor; the other end of the metal needle is externally connected to a resistance detection and analysis device through a No. Ⅱ wire; the resistance detection and analysis device is used to collect, transmit, analyze and output the resistivity detected by the metal electrode, and analyze and prompt the relative height of the gas-slag interface.

[0009] Furthermore, the connector also includes a reinforcing steel plate, which is welded and fixed to the outer wall of the soil bin partition to prevent the sensor and the connector from being damaged by the pressure difference on both sides of the soil bin partition; the No. 2 wire connected to the metal needle passes through the hole on the reinforcing steel plate and is electrically connected to the resistance detection and analysis device.

[0010] Furthermore, an insulating protective sleeve is provided between the metal electrode and the alloy panel; the spacing between adjacent metal electrodes arranged in the horizontal direction is 5 to 6 cm, and the spacing between adjacent metal electrodes arranged in the vertical direction is 10 to 12 cm; the diameters of the insulating base plate and the alloy panel are consistent and are 20 to 30 cm.

[0011] Furthermore, the resistance detection and analysis device includes a filtering and preprocessing module, an intelligent controller and a human-computer interaction interface that are electrically connected in sequence; the metal electrode is used to detect the resistance signal of the plane on which it is located, and the resistance signal is processed by the filtering and preprocessing module and input into the intelligent controller to calculate the apparent resistivity and analyze and prompt the relative height of the gas-slag interface, which is output by the human-computer interaction interface.

[0012] Furthermore, the filtering and preprocessing module is provided with 10 to 20 PIN interfaces, the metal electrode is connected to the metal card slot through the No. Ⅰ conductor, and the metal card slot is electrically connected to the PIN interface through the metal needle and the No. Ⅱ conductor.

[0013] Furthermore, the intelligent controller includes a data conversion module for data acquisition and conversion of resistance signals; the data conversion module is an AD / DA circuit.

[0014] Furthermore, a method for installing a monitoring device for the height of the gas-slag interface in the soil bin of a composite shield machine includes the following installation steps:

[0015] S1. Determine the height position where the sensor needs to be installed in the soil bin partition, and drill holes and tap the soil bin partition;

[0016] S2. After screwing the insulator into the hole, fix the connector in the hole of the soil bin partition, and connect the metal slot on the sensor with the corresponding metal pin that penetrates the insulator;

[0017] S3, use wire II to connect the resistance detection and analysis device to the other end of the metal needle that penetrates the insulator;

[0018] S4. After the metal slot and the metal pin are connected, the alloy panel is welded and fixed on the soil bin partition, and then the sensor and the connector are sealed inside the soil bin partition.

[0019] Furthermore, the monitoring method of the monitoring device for the gas-slag interface height in the soil bin of the composite shield machine has the following specific steps:

[0020] A1. The height position of the horizontally arranged metal electrodes inside the sensor and the distance between two vertically arranged adjacent metal electrodes are used as input information and input into the intelligent controller through the human-computer interaction interface;

[0021] A2. The resistance signal of the plane at a height of h detected by the horizontally arranged metal electrodes in the sensor is transmitted to the filtering and preprocessing module through the connector. After the resistance signal is processed by the filtering and preprocessing module, it is converted into a digital signal through the data conversion module and input into the intelligent controller. According to the electrical principle, the apparent resistivity ρ at the height of h is measured. s (h);

[0022] A3, using the metal electrodes arranged vertically in the sensor to detect the resistance signal of the plane where the height is h+a and ha, the steps described in A2 are transmitted, and according to the electrical principle, the apparent resistivity ρ in the height range of h~h+a and h~ha is obtained s (h+a) and ρ s (ha), the value of a is one-fourth of the distance between the top and bottom vertically arranged metal electrodes;

[0023] A4. Compare the calculated apparent resistivity with the resistivity threshold, and determine the relative position of the gas-slag interface and the sensor according to the following formula to monitor the gas-slag interface, and output the determination result through the human-computer interaction interface:

[0024] ρ s (h)<ρ 阈 And s (h+a)<ρ阈 , then the gas-slag interface is above h+a;

[0025] ρ s (h)<ρ 阈 And s (h+a)>ρ 阈 , then the gas-slag interface is between h and h+a;

[0026] ρ s (h)>ρ 阈 And s (ha)<ρ 阈 , then the gas-slag interface is between ha and h;

[0027] ρ s (h)>ρ 阈 And s (ha)>ρ 阈 , then the gas-slag interface is below ha;

[0028] Among them, the resistivity threshold ρ 阈 The value of is greater than the apparent resistivity of the slag and less than the resistivity of the air.

[0029] Beneficial effects of the present invention:

[0030] 1. The monitoring device of the present invention utilizes the significant difference in resistivity between the water-containing slag and air in the soil bin. By analyzing the resistivity change at a specific height in the soil bin, the height of the air-slag interface can be accurately obtained, providing reference information for the tunneling control of the composite shield machine. At the same time, the device is installed in the soil bin partition, which is easy to install and will not affect the normal tunneling work of the shield machine. It can ensure that the sensor and the connecting device are not damaged under the high pressure in the soil bin during the operation of the shield machine.

[0031] 2. The monitoring process of the monitoring device of the present invention is automatically realized through digitalization, and the height of the gas-slag interface in the soil bin can be monitored in real time. At the same time, according to the monitored height of the gas-slag interface, the shield tunneling control of the shield machine in the air pressure assisted mode can be guided; by installing a sensor at the safe lower limit h of the gas-slag interface height, when the gas-slag interface is above h+α, it indicates that measures can be taken to further reduce the gas-slag height; when the gas-slag interface is between h and h+α, it indicates that the current state is good and the current tunneling parameters are maintained; when the gas-slag interface is between h and h-α, the current state is normal, but measures need to be taken to increase the gas-slag height; when the gas-slag interface is below h-α, there is a safety hazard in the current state, and measures need to be taken immediately to increase the gas-slag height.

[0032] 3. In the present invention, a plurality of gas-slag interface height monitoring devices can be installed at different heights, which can further increase the monitoring range of the gas-slag height. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the installation of the monitoring device of the present invention;

[0034] Figure 2 It is a front view of the sensor in the present invention;

[0035] Figure 3 It is the internal structure diagram of the sensor in the present invention;

[0036] Figure 4 It is a rear view of the sensor in the present invention;

[0037] Figure 5 It is a structural schematic diagram of the connector in the present invention;

[0038] Figure 6 for Figure 1 A magnified schematic diagram of center A.

[0039] The reference numerals in the figure are as follows:

[0040] 1. Soil bin partition; 2. Sensor; 21. Alloy panel; 22. Insulating bottom plate; 23. Metal electrode; 231. Insulating protective cover; 24. Metal slot; 25. No. I wire; 3. Connector; 31. Metal needle; 32. Insulator; 321. External thread; 33. No. II wire; 34. Reinforced steel sheet; 4. Resistance detection and analysis device; 41. Filtering and preprocessing module; 42. Intelligent controller; 43. Human-computer interaction interface; 44. Data conversion module; 5. Gas-slag interface; 6. High-pressure air; 7. Slag; 8. Screw machine. DETAILED DESCRIPTION

[0041] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] The air-slag interface 5 divides the water-bearing weathering layer into slag 7 and high-pressure air 6. The resistivity of the soil is about 100Ω·m, the resistivity of water is about 0.1Ω·m, the slag 7 is a mixture of water and soil, and the resistivity does not exceed 100Ω·m. The resistivity of the high-pressure air 6 is about 1×10 16 Ω·m. The resistivity threshold ρ 阈 For 10 8 Ω·m.

[0043] See also Figures 1 to 6A monitoring device for the height of the gas-slag interface in the soil bin of a composite shield machine comprises a sensor 2 and a connector 3 installed in a soil bin partition 1; the sensor 2 comprises an alloy panel 21 and an insulating bottom plate 22 superimposed on the alloy panel 21; a plurality of metal electrodes 23 arranged in a cross are arranged on the alloy panel 21; a plurality of metal slots 24 are embedded in the middle of the insulating bottom plate 22, and a plurality of No. Ⅰ wires 25 connect the corresponding metal electrodes 23 and one end of the metal slots 24 close to the alloy panel 21; the connector 3 is an insulator 32 with a plurality of metal needles 31 running through it, and the outer ring of the insulator 32 has an external thread 3 21 is fixed on the soil bin partition 1; one end of the metal needle 31 is inserted into the metal slot 24, and then the connector 3 is connected to the metal electrode 23 on the sensor 2; after the metal slot 24 is connected to the metal needle 31 of the connector 3, the alloy panel 21 and the soil bin partition 1 are welded and sealed, so as to fix the sensor 2 and prevent the material in the soil bin from flowing into the sensor 2; the other end of the metal needle 31 is connected to a resistance detection and analysis device 4 through a No. II wire 33; the resistance detection and analysis device 4 is used to collect, transmit, analyze and output the resistivity detected by the metal electrode 23, and analyze and prompt the relative height of the gas-slag interface.

[0044] Furthermore, the connector 3 also includes a reinforcing steel sheet 34, which is fixed to the outer wall of the soil bin partition 1 to prevent the sensor 2 and the connector 3 from being damaged by the pressure difference on both sides of the soil bin partition 1; the No. II wire 33 connected to the metal needle 31 passes through the hole on the reinforcing steel sheet 34 and is electrically connected to the resistance detection and analysis device 4.

[0045] Furthermore, an insulating protective sleeve 231 is provided between the metal electrode 23 and the alloy panel 21; the spacing between adjacent metal electrodes 23 arranged in the horizontal direction is 5 to 6 cm, and the spacing between adjacent metal electrodes 23 arranged in the vertical direction is 10 to 12 cm; the diameters of the insulating base plate 22 and the alloy panel 21 are consistent and are 20 to 30 cm, and the specific sizes of the adjacent metal electrodes 23, the insulating base plate 22 and the alloy panel 21 can be adjusted according to the size of the composite shield machine.

[0046] Furthermore, the resistance detection and analysis device 4 includes a filtering and preprocessing module 41, an intelligent controller 42 and a human-computer interaction interface 43 which are electrically connected in sequence; wherein the filtering and preprocessing module 41 performs filtering and preprocessing on the original data to achieve the purpose of eliminating interference anomalies; the intelligent controller 42 is mainly used for data acquisition, data processing, storage and power supply, mainly DSP, single-chip microcomputer, ARM, etc.; the human-computer interaction interface 43 is mainly used to display the working parameters detected by the sensor 2 device, and is also used to set parameters for the gas-slag interface 5 height monitoring device in the soil bin; the metal electrode 23 is used to detect the resistance signal of the plane where it is located. The resistance signal is processed by the filtering and preprocessing module 41 and input into the intelligent controller 42 to calculate the apparent resistivity and analyze and prompt the relative height of the gas-slag interface, which is output by the human-computer interaction interface 43.

[0047] Furthermore, the filtering and preprocessing module 41 is provided with 10 to 20 PIN interfaces, the metal electrode 23 is connected to the metal card slot 24 through the No. I wire 25 , and the metal card slot 24 is electrically connected to the PIN interface through the metal needle 31 and the No. II wire 33 .

[0048] Furthermore, the intelligent controller 42 includes a data conversion module 44 for data acquisition and conversion of resistance signals; the data conversion module 44 is electrically connected to the intelligent controller 42 and can be integrated into a printed circuit board or an integrated control module; the data conversion module 44 is an AD / DA circuit.

[0049] The installation method of the monitoring device for the gas-slag interface height in the soil bin of the composite shield machine, the arrangement of the sensor 2 should avoid the existing screw machine 8 and other equipment and its openings on the soil bin partition 1 of the shield machine; the strength of the soil bin partition 1 after the arrangement of the sensor 2 should be reviewed, and if necessary, it should be strengthened to meet the working requirements of the shield machine. The specific installation steps are as follows:

[0050] S1. Determine the height position where the sensor 2 needs to be installed in the soil bin partition 1, and drill holes and tap the soil bin partition 1. The height of the sensor 2 is usually the target height or critical height of the slag interface that is of great guiding significance for shield construction, such as half the soil bin height and one third the soil bin height.

[0051] S2, screw the insulator 32 into the hole and then fix the connector 3 in the hole of the soil bin partition 1, and connect the metal slot 24 on the sensor 2 with the corresponding metal pin 31 that passes through the insulator 32;

[0052] S3, using the No. II wire 33 to connect the resistance detection and analysis device 4 and the other end of the metal needle 31 that passes through the insulator 32;

[0053] S4, after the metal slot 24 and the metal needle 31 are connected, the alloy panel 21 is welded and fixed on the soil bin partition 1, and then the sensor 2 and the connector 3 are sealed inside the soil bin partition 1.

[0054] The monitoring method of the monitoring device for the gas-slag interface height in the soil bin of a composite shield machine has the following specific steps:

[0055] A1. The height position of the metal electrode 23 arranged horizontally inside the sensor 2 and the distance between two metal electrodes 23 arranged vertically and adjacent to each other are input into the intelligent controller 42 through the human-computer interaction interface 43;

[0056] A2. The resistance signal of the plane at the height h detected by the horizontally arranged metal electrode 23 in the sensor 2 is transmitted to the filtering and preprocessing module 41 via the connector 3. After the resistance signal is processed by the filtering and preprocessing module 41, the resistance signal is converted into a digital signal via the data conversion module 44 and input into the intelligent controller 42. According to the electrical principle, the apparent resistivity ρ at the height h is measured. s (h);

[0057] A3, using the resistance signal of the plane where the heights h+α and h-α are located detected by the vertically arranged metal electrodes 23 in the sensor 2, the signal is transmitted as described in A2, and the apparent resistivity within the height ranges of h to h+α and h to h-α is calculated according to electrical principles;

[0058] A4. Compare the detected apparent resistivity with the resistivity threshold, and determine the relative position of the gas-slag interface 5 and the sensor 2 according to the following formula, so as to monitor the gas-slag interface 7, and output the determination result through the human-computer interaction interface 43:

[0059] ρ s (h)<ρ 阈 And s (h+a)<ρ 阈 , then the gas-slag interface is above h+a;

[0060] ρ s (h)<ρ 阈 And s (h+a)>ρ 阈 , then the gas-slag interface is between h and h+a;

[0061] ρ s (h)>ρ 阈 And s (ha)<ρ 阈 , then the gas-slag interface is between ha and h;

[0062] ρ s (h)>ρ阈 And s (ha)>ρ 阈 , then the gas-slag interface is below ha;

[0063] Among them, the resistivity threshold ρ 阈 The value of is greater than the apparent resistivity of the slag and less than the resistivity of the air.

[0064] The monitoring results of the gas-slag interface 5 height can provide guidance for shield tunneling control in the gas pressure assisted mode:

[0065] By installing the sensor 2 at the safe lower limit h of the height of the gas-slag interface 5, when the height of the gas-slag interface 5 is above the height h+α, it indicates that measures can be taken to further reduce the gas-slag height; when the height of the gas-slag interface 5 is between h and h+α, it indicates that the current state is good and the current excavation parameters are maintained; when the height of the gas-slag interface 5 is between h and h-α, the current state is normal, but measures need to be taken to increase the gas-slag height; when the height of the gas-slag interface 5 is below h-α, there are safety hazards in the current state and measures need to be taken immediately to increase the gas-slag height.

[0066] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A monitoring device for the height of the gas-slag interface in the soil bin of a composite shield machine, characterized in that: The invention comprises a sensor (2) and a connector (3) installed in a soil bin partition (1); the sensor (2) comprises an alloy panel (21) and an insulating bottom plate (22) superimposed on the alloy panel (21); a plurality of metal electrodes (23) arranged in a cross shape are arranged on the alloy panel (21); a plurality of metal slots (24) are embedded in the middle of the insulating bottom plate (22); a plurality of No. Ⅰ wires (25) connect the corresponding metal electrodes (23) and one end of the metal slot (24) close to the alloy panel (21); the connector (3) is an insulator (32) with a plurality of metal needles (31) passing through it, and the outer ring of the insulator (32) has an external thread (321) for fixing on the soil bin partition (1); one end of the metal needle (31) is inserted into the metal slot (24), thereby The connector (3) is connected to the metal electrode (23) on the sensor (2); after the metal slot (24) is connected to the metal pin (31) of the connector (3), the alloy panel (21) and the soil bin partition (1) are welded and sealed to fix the sensor (2); the other end of the metal pin (31) is connected to a resistance detection and analysis device (4) through a No. II wire (33); the resistance detection and analysis device (4) is used to collect, transmit, analyze and output the resistivity detected by the metal electrode (23), and analyze and prompt the relative height of the gas-slag interface; the resistance detection and analysis device (4) includes a filtering and preprocessing module (41), an intelligent controller (42) and a human-computer interaction interface (43) which are electrically connected in sequence; the filtering and preprocessing module (41) performs filtering and preprocessing on the original data; The intelligent controller (42) is used for data collection, data processing, storage and power supply; the human-machine interaction interface (43) is used to display the working parameters detected by the sensor (2) device, and is also used to set parameters for the gas-slag interface (5) height monitoring device in the soil bin.

2. The device for monitoring the gas-slag interface height in the soil bin of a composite shield machine according to claim 1, characterized in that: The connector (3) further comprises a reinforcing steel sheet (34), which is welded and fixed to the outer wall of the soil bin partition (1) to prevent the sensor (2) and the connector (3) from being damaged by the pressure difference on both sides of the soil bin partition (1); and a No. II wire (33) connected to the metal needle (31) passes through the hole on the reinforcing steel sheet (34) and is electrically connected to the resistance detection and analysis device (4).

3. The device for monitoring the gas-slag interface height in the soil bin of a composite shield machine as claimed in claim 2, characterized in that: An insulating protective sleeve (231) is provided between the metal electrode (23) and the alloy panel (21); the spacing between adjacent metal electrodes (23) arranged in the horizontal direction is 5 to 6 cm, and the spacing between adjacent metal electrodes (23) arranged in the vertical direction is 10 to 12 cm; the diameters of the insulating bottom plate (22) and the alloy panel (21) are consistent and are 20 to 30 cm.

4. The device for monitoring the gas-slag interface height in the soil bin of a composite shield machine according to claim 1, characterized in that: The metal electrode (23) is used to detect the resistance signal of the plane where it is located. The resistance signal is processed by the filtering and preprocessing module (41) and input into the intelligent controller (42) to calculate the apparent resistivity and analyze and prompt the relative height of the gas-slag interface, which is output by the human-computer interaction interface (43).

5. The device for monitoring the gas-slag interface height in the soil bin of a composite shield machine as claimed in claim 4, characterized in that: The filtering and preprocessing module (41) is provided with 10 to 20 PIN interfaces, the metal electrode (23) is connected to the metal card slot (24) via a No. I conductor (25), and the metal card slot (24) is electrically connected to the PIN interface via a metal needle (31) and a No. II conductor (33).

6. The device for monitoring the gas-slag interface height in the soil bin of a composite shield machine as claimed in claim 5, characterized in that: The intelligent controller (42) also includes a data conversion module (44) for data acquisition and conversion of resistance signals; the data conversion module (44) is an AD / DA circuit.

7. A method for installing the device for monitoring the height of the gas-slag interface in the soil bin of a composite shield machine as claimed in claim 1, characterized in that: The installation steps include: S1, determining the height position where the sensor (2) needs to be installed in the soil bin partition (1), and drilling and tapping holes in the soil bin partition (1); S2, after screwing the insulator (32) into the hole, fix the connector (3) in the hole of the soil bin partition (1), and connect the metal slot (24) on the sensor (2) with the corresponding metal pin (31) penetrating the insulator (32); S3, using a No. II wire (33) to connect the resistance detection and analysis device (4) and the other end of the metal needle (31) that passes through the insulator (32); After S4, the metal slot (24) and the metal needle (31) are connected, the alloy panel (21) is welded and fixed on the soil bin partition (1), and then the sensor (2) and the connector (3) are sealed inside the soil bin partition (1).

8. A monitoring method for the gas-slag interface height monitoring device in the soil bin of a composite shield machine as claimed in claim 1, characterized in that: The specific steps are as follows: A1, taking the height position of the metal electrodes (23) arranged horizontally inside the sensor (2) and the distance between two metal electrodes (23) arranged vertically and adjacent to each other as input information, and inputting them into the intelligent controller (42) through the human-machine interaction interface (43); A2. The resistance signal of the plane at the height h detected by the horizontally arranged metal electrodes (23) in the sensor (2) is transmitted to the filtering and preprocessing module (41) via the connector (3). After the resistance signal is processed by the filtering and preprocessing module (41), the resistance signal is converted into a digital signal via the data conversion module (44) and input into the intelligent controller (42). According to the electrical principle, the apparent resistivity ρ at the height h is measured. s (h); A3, using the vertically arranged metal electrodes (23) in the sensor (2) to detect the resistance signal of the plane where the height is h+a and ha, the signal is transmitted as described in A2, and according to the electrical principle, the apparent resistivity ρ in the height range of h~h+a and h~ha is obtained. s (h+a) and ρ s (ha), the value of a is one-fourth of the distance between the top and bottom vertically arranged metal electrodes; A4. Compare the detected apparent resistivity with the resistivity threshold, and determine the relative position of the gas-slag interface (5) and the sensor (2) according to the following formula, so as to monitor the gas-slag interface (5), and output the determination result through the human-computer interaction interface (43): ρ s (h)<ρ 阈 And s (h+a)<ρ 阈 , then the gas-slag interface (5) is above h+a; ρ s (h)<ρ 阈 And s (h+a)>ρ 阈 , then the gas-slag interface (5) is between h and h+a; ρ s (h)>ρ 阈 And s (ha)<ρ 阈 , then the gas-slag interface (5) is between ha and h; ρ s (h)>ρ 阈 And s (ha)>ρ 阈 , then the gas-slag interface (5) is below ha; Among them, the resistivity threshold ρ 阈 The value of is greater than the apparent resistivity of the slag and less than the resistivity of the air.

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