A high-precision carbon-determining probe applied to a bomb-throwing rapid analyzer for a converter

Abstract

The application relates to a high-precision carbon-determining detection probe applied to a bomb-throwing type rapid analyzer of a converter, and belongs to the field of molten steel component detection probes. The probe comprises a protective paper tube and a tubular resin sand and a signal transmission unit which are sequentially arranged in the protective paper tube from bottom to top. The tubular resin sand is provided with a carbon-determining intelligent sensor connected with the signal transmission unit. The protective paper tube is provided with a molten steel inlet in communication with the inside of the tubular resin sand. The outer side of the tubular resin sand is provided with a metal detection head. The metal detection head is provided with a protection unit at one end outside the protective paper tube. The top end of the protective paper tube is provided with a secondary injection unit for pushing the protective paper tube into the molten steel. The application has the technical effect of improving the detection precision of the carbon-determining probe.

Description

Technical Field

[0001] This application relates to the technical field of probes for detecting the composition of molten steel, and in particular to a high-precision carbon determination probe for use in a converter bombardment-type rapid analyzer. Background Technology

[0002] End-point control in converter steelmaking is a crucial step in steel production, as the rapid and accurate determination of carbon content and temperature in molten steel directly impacts product quality and production costs. Traditional carbon determination methods suffer from significant time lag and insufficient accuracy, making them unsuitable for the demands of modern, high-efficiency steelmaking processes. While bomb-type rapid analysis technology enables direct measurement within the furnace, the extreme environment of the converter—high temperature, abundant slag, and strong impacts—poses significant challenges to the probe's survivability, penetration performance, and signal stability.

[0003] If there are large, unmelted metal blocks in the molten steel, the carbon determination probe is prone to colliding with the metal blocks when it enters the molten steel. This can damage the carbon determination intelligent sensor inside the probe or prevent the probe from reaching the specified depth in the molten steel, seriously affecting the test results.

[0004] Patent (201320020878.2) discloses a converter drop-type high-precision wireless detection probe, including a metal detector head, a slag-avoiding paper cap covering the metal detector head, a transmitting end, a heat-resistant wire, and a fire-fighting expansion material layer. The transmitting end is located outside the metal detector head, and the metal detector head is connected to the transmitting end through the heat-resistant wire. The fire-fighting expansion material layer is provided outside the transmitting end. The slag-avoiding paper cap at the end of the probe in the above patent can only penetrate the slag layer on the surface of the molten steel. Once it collides with a metal block inside the molten steel, it will still damage the internal detection element and cannot effectively penetrate into the molten steel to the predetermined depth, affecting the detection accuracy of the carbon determination probe.

[0005] Regarding the aforementioned technologies, the inventors believe that there is a defect where the carbon-fixing probe collides with a metal block in the molten steel, causing a decrease in the detection accuracy of the carbon-fixing probe. Summary of the Invention

[0006] To address the aforementioned technical issues, this application provides a high-precision carbon determination probe for use in a converter bombardment-type rapid analyzer.

[0007] This application provides a high-precision carbon determination probe for use in a converter bombardment-type rapid analyzer, employing the following technical solution:

[0008] A high-precision carbon determination probe for use in a converter bomb-type rapid analyzer includes a protective paper tube and tubular resin sand and a signal transmission unit arranged sequentially from bottom to top inside the protective paper tube; a carbon determination intelligent sensor connected to the signal transmission unit is disposed inside the tubular resin sand; a molten steel inlet communicating with the interior of the tubular resin sand is provided inside the protective paper tube; a metal detection head is disposed on the outside of the tubular resin sand; a protective unit is disposed at one end of the metal detection head located outside the protective paper tube; and a secondary injection unit for pushing the protective paper tube deeper into the molten steel is disposed at the top of the protective paper tube.

[0009] By adopting the above technical solution, a protective unit is set at the bottom of the metal detector head to protect the protective paper tube and its internal components. When the paper tube extends into the molten steel and touches an unmelted metal block, the protective unit can prevent the metal detector head and the protective paper tube from directly colliding with the metal block. By setting a secondary injection unit at the top of the protective paper tube, the protective paper tube can continue to extend downward after being blocked by the metal block, delivering the carbon determination intelligent sensor to the specified depth in the molten steel. This solves the problem in the prior art where the test data fails after the protective paper tube touches the metal block.

[0010] Preferably, the signal transmission unit includes a high-temperature resistant cable and two positioning blocks; the high-temperature resistant cable is coiled inside the protective paper tube; one end of the high-temperature resistant cable is electrically connected to the carbon-fixing intelligent sensor, and the other end is connected to a connector; the two positioning blocks are respectively disposed at both ends of the high-temperature resistant cable; and are respectively used to fix both ends of the high-temperature resistant cable on the protective paper tube.

[0011] Preferably, the carbon-fixing intelligent sensor includes a temperature-measuring thermocouple and a carbon-fixing thermocouple disposed within the tubular resin sand; the temperature-measuring thermocouple and the carbon-fixing thermocouple are respectively electrically connected to the signal transmission unit.

[0012] Preferably, the protective unit includes a protective seat, a buffer paper pad, and a conical block arranged sequentially from top to bottom along the axial direction of the protective paper tube; the protective seat is located at the bottom of the metal detector head.

[0013] By adopting the above technical solution, the conical block at the bottom of the protective paper tube can break the surface tension of the molten steel and penetrate the slag layer, so that the protective paper tube can be stably inserted into the molten steel; the buffer paper pad between the protective seat and the conical block can buffer the pressure generated when the conical block penetrates the slag layer and touches the unmelted metal block, thus ensuring the safety of the carbon determination intelligent sensor.

[0014] Preferably, the secondary injection unit includes a mounting base, an air pressure bladder, and a sealing block; the mounting base is disposed at the top end of the protective paper tube; the air pressure bladder is disposed on the mounting base; the top end of the air pressure bladder has an injection port; and the sealing block is disposed at the injection port.

[0015] Preferably, the top wall of the mounting base has an expansion port that communicates with the injection port.

[0016] Preferably, the sealing block is a hot-melt rubber block; the mounting base has a hot-melt hole; one end of the hot-melt hole is directly opposite the sealing block; the other end of the hot-melt hole is connected to one end of a hot-melt tube; the other end of the hot-melt tube extends downward; the mounting base is provided with an opening and closing unit; the opening and closing unit is used to open or close the hot-melt hole.

[0017] By adopting the above technical solution, the high temperature generated by molten steel is captured by the hot melt pipe, and the high-temperature hot gas is conducted to the hot melt hole. In conjunction with the sealing block, the high-temperature hot gas generated by the molten steel is fully utilized to melt the sealing block, causing the high-pressure gas inside the air pressure bladder to be ejected. The above process is a purely physical and chemical process, and its reliability is far higher than that of electronic fuses or mechanical impact fuses. It is also unaffected by electromagnetic interference, requires no power supply, and has a simple structure. By setting an opening and closing unit to open or close the hot melt hole, the opening and closing unit can close the hot melt hole during storage and transportation, cutting off the heat conduction path and preventing the air pressure bladder from being accidentally triggered by ambient temperature.

[0018] Preferably, the protective seat has a pressure chamber; the hot-melt pipe is connected to the pressure chamber.

[0019] By adopting the above technical solution, after the protective seat is inserted into the molten steel, the gas in the pressure chamber expands due to heat; after the hot melt pipe is connected to the pressure chamber, the high temperature and high pressure gas generated in the pressure chamber acts on the sealing block, which improves the melting efficiency of the sealing block.

[0020] Preferably, the conical block is provided with a pressure rod; one end of the pressure rod passes through the buffer paper pad and extends into the pressure chamber.

[0021] Preferably, the hot-melt hole is an L-shaped hole; the opening and closing unit includes an opening and closing block and an elastic element; the opening and closing block is slidably disposed at the corner of the hot-melt hole; the opening and closing block is used to close or open the hot-melt hole after sliding; the two ends of the elastic element are respectively connected to the opening and closing block and the mounting base; the elastic element is used to provide the force for the opening and closing block to close the hot-melt hole.

[0022] By adopting the above technical solution, the opening and closing block, together with the elastic element, can achieve the effect of automatic sealing of the hot melt hole, completely cutting off the path of high-temperature furnace gas or heat to the hot melt rubber block through the hot melt pipe; in conjunction with the pressure rod on the conical block, when the conical block collides with the incompletely melted metal block, the pressure rod is squeezed into the pressure chamber, and the high-temperature and high-pressure gas in the pressure chamber is squeezed towards the opening and closing block, thereby pushing the opening and closing block to move away from the hot melt hole, so that the high-temperature furnace gas acts on the sealing block and melts the sealing block, thus achieving the effect of automatic operation of the secondary spraying unit when the bottom end of the protective paper tube touches the incompletely melted metal block.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. By setting a protective unit at the bottom of the metal detector head to protect the protective paper tube and its internal components, the protective unit can prevent the metal detector head and protective paper tube from directly colliding with the metal block when the paper tube extends into the molten steel and touches an incompletely melted metal block. By setting a secondary injection unit at the top of the protective paper tube, the protective paper tube can continue to extend downward after being blocked by the metal block, delivering the carbon determination intelligent sensor to the specified depth of the molten steel, thus solving the problem in the prior art where the test data fails after the protective paper tube touches the metal block.

[0025] 2. By setting up a hot-melt pipe to capture the high temperature generated by molten steel and conduct the high-temperature hot gas to the hot-melt hole, which works in conjunction with the sealing block to fully utilize the high-temperature hot gas generated by the molten steel to melt the sealing block, causing the high-pressure gas inside the airbag to be ejected. The above process is a purely physical and chemical process, and its reliability is far higher than that of electronic fuses or mechanical impact fuses. It is also unaffected by electromagnetic interference, requires no power supply, and has a simple structure. By setting up an opening and closing unit to open or close the hot-melt hole, the opening and closing unit can close the hot-melt hole during storage and transportation, cutting off the heat conduction path and preventing the airbag from being accidentally triggered by ambient temperature.

[0026] 3. The opening and closing block, in conjunction with the elastic element, can achieve the effect of automatic sealing of the hot melt hole, completely cutting off the path of high-temperature furnace gas or heat to the hot melt rubber block through the hot melt pipe; in conjunction with the pressure rod on the conical block, when the conical block collides with the incompletely melted metal block, the pressure rod is squeezed into the pressure chamber, and the high-temperature and high-pressure gas in the pressure chamber is squeezed towards the opening and closing block, thereby pushing the opening and closing block to move away from the hot melt hole, so that the high-temperature furnace gas acts on the sealing block and melts the sealing block, thus achieving the effect of automatic operation of the secondary spraying unit when the bottom end of the protective paper tube touches the incompletely melted metal block. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a high-precision carbon determination probe used in a converter bombardment-type rapid analyzer.

[0028] Figure 2 yes Figure 1 A magnified view of part A in the image.

[0029] Figure 3 yes Figure 1 A magnified view of part B in the image.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Protective paper tube; 11. Molten steel inlet; 12. Metal detector head;

[0032] 2. Tubular resin sand;

[0033] 3. Signal transmission unit; 31. High-temperature resistant cable; 32. Positioning block; 33. Connector;

[0034] 4. Carbon-fixing intelligent sensor; 41. Temperature-measuring thermocouple; 42. Carbon-fixing thermocouple;

[0035] 5. Protective unit; 51. Protective seat; 511. Pressure chamber; 52. Buffer paper pad; 53. Conical block; 531. Pressure rod;

[0036] 6. Secondary injection unit; 61. Mounting base; 611. Hot melt hole; 612. Expansion hole; 62. Air pressure bladder; 621. Injection port; 63. Sealing block; 64. Hot melt tube;

[0037] 7. Opening and closing unit; 71. Opening and closing block; 72. Elastic element. Detailed Implementation

[0038] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0039] This application discloses a high-precision carbon determination probe for use in a converter bombardment-type rapid analyzer. (Refer to...) Figure 1-3 The system includes a protective paper tube 1 and tubular resin sand 2 and a signal transmission unit 3 arranged sequentially from bottom to top inside the protective paper tube 1; a carbon-fixing intelligent sensor 4 connected to the signal transmission unit 3 is installed inside the tubular resin sand 2; the protective paper tube 1 has a molten steel inlet 11 that communicates with the inside of the tubular resin sand 2; after the protective paper tube 1 enters the molten steel, the protective paper tube 1 is melted by the high temperature of the molten steel, allowing the molten steel to enter the molten steel inlet 11, and finally enter the tubular resin sand; a metal detection head 12 is installed on the outside of the tubular resin sand 2; a protective unit 5 is installed at one end of the metal detection head 12 located on the outside of the protective paper tube 1; a secondary injection unit 6 is installed at the top of the protective paper tube 1 to push the protective paper tube 1 deeper into the molten steel.

[0040] Specifically, the signal transmission unit 3 includes a high-temperature resistant cable 31 and two positioning blocks 32; the high-temperature resistant cable 31 is coiled inside the protective paper tube 1; one end of the high-temperature resistant cable 31 is electrically connected to the carbon-fixed intelligent sensor 4, and the other end is connected to a connector 33; the two positioning blocks 32 are respectively disposed at both ends of the high-temperature resistant cable 31; and are used to fix both ends of the high-temperature resistant cable 31 to the protective paper tube 1; the carbon-fixed intelligent sensor 4 includes a temperature-measuring thermocouple 41 and a carbon-fixed thermocouple 42 disposed inside the tubular resin sand 2; the temperature-measuring thermocouple 41 and the carbon-fixed thermocouple 42 are respectively electrically connected to the signal transmission unit 3; specifically, the temperature-measuring thermocouple 41 and the carbon-fixed thermocouple 42 are respectively connected to the high-temperature resistant cable 31.

[0041] Reference Figure 3 The protective unit 5 includes a protective seat 51, a buffer paper pad 52, and a conical block 53 arranged sequentially from top to bottom along the axial direction of the protective paper tube 1; the protective seat 51 is located at the bottom of the upper metal detector head 12; after the protective seat 51, the buffer paper pad 52, and the conical block 53 are connected in sequence, a conical protective unit with the tip pointing downward is formed.

[0042] Reference Figure 2 The secondary injection unit 6 includes a mounting base 61, an air pressure bladder 62, and a sealing block 63. The mounting base 61 is located at the top of the protective paper tube 1. The air pressure bladder 62 is mounted on the mounting base 61. The top of the air pressure bladder 62 has an injection port 621. An expansion port communicating with the injection port 621 is opened on the top wall of the mounting base 61. The expansion port is conical and can expand the high-pressure gas ejected from the injection port 621 outward, enhancing the stability of the protective paper tube 1 during operation. The sealing block 63 is located at the injection port 621. The sealing block 63 is a hot-melt rubber block, which allows the sealing block 63 to automatically deflect after receiving high temperatures. Melting opens the injection port 621 of the air pressure bag 62; a hot melt hole 611 is provided on the mounting base 61; the hot melt hole 611 is an L-shaped hole, one end of which is directly opposite the sealing block 63, and the other end is connected to one end of the hot melt tube 64; the other end of the hot melt tube 64 extends downward; the protective base 51 has a pressure chamber 511, and the end of the hot melt tube 64 extends downward and connects to the pressure chamber 511; a pressure rod 531 is provided on the conical block 53, one end of the pressure rod 531 passes through the buffer paper pad 52 and extends into the pressure chamber 511; the other end of the pressure rod 531 is connected to the conical block 53.

[0043] When the conical block 53 passes through the slag layer on the surface of the molten steel, the conical block 53 is subjected to the first compression. Since the buffer paper pad 52 does not enter the molten steel, there is no hard buffering between the buffers, and the pressure rod 531 does not move significantly into the pressure chamber 511. When the conical block 53 is inserted into the molten steel, the buffer paper pad 52 is eroded by the molten steel. When the conical block 53 touches the unmelted metal block, the overall structure of the buffer paper pad 52 eroded by the molten steel is destroyed. After being compressed, the conical block 53 can move towards the protective seat 51, thereby causing the pressure rod 531 to move into the pressure chamber 511 and pushing the high-temperature and high-pressure gas in the pressure chamber 511 into the hot melt pipe 64.

[0044] It should be noted that the end of the protective paper tube 1 that extends into the molten steel is defined as the bottom end of the protective paper tube 1, and the other end is defined as the top end of the protective paper tube 1.

[0045] Reference Figure 2 An opening and closing unit 7 is provided on the mounting base 61; the opening and closing unit 7 is used to open or close the hot melt hole 611; specifically, the opening and closing unit 7 includes an opening and closing block 71 and an elastic element 72; the opening and closing block 71 is slidably disposed at the corner of the hot melt hole 611; after the opening and closing block 71 slides, it is used to close or open the hot melt hole 611; the two ends of the elastic element 72 are respectively connected to the opening and closing block 71 and the mounting base 61; the elastic element 72 is used to provide the force for the opening and closing block 71 to close the hot melt hole 611.

[0046] When the conical block 53 touches the unmelted metal block, the high-temperature and high-pressure gas in the hot melt tube 64 squeezes the opening and closing block 71 and opens the hot melt hole 611. This causes the high-temperature and high-pressure gas to act on the sealing block 63 and melt it, thereby opening the injection port 621 and ejecting the high-pressure gas in the air pressure bladder 62 from the injection port 621. This pushes the protective paper tube 1 to continue moving into the molten steel, allowing the carbon determination intelligent sensor 4 to be transmitted to the specified depth.

[0047] The working principle of a high-precision carbon determination probe used in a converter bomb-type rapid analyzer in this application is as follows:

[0048] When detecting the carbon content in molten steel, the protective paper tube 1 is launched by the bomb-type rapid analyzer and shot towards the surface of the molten steel in the converter. At this time, the guide fins play a role in stabilizing the flight attitude of the protective paper tube 1, ensuring that it impacts the liquid surface at a near-vertical angle. The opening and closing unit 7 is in the locked state, and the elastic element 72 pushes the opening and closing block 71 to close the L-shaped hot melt hole 611. Subsequently, the cone block 53 of the probe impacts and penetrates the slag layer at the converter mouth. The buffer paper pad 52 has not yet come into contact with the high-temperature molten steel and still maintains its structural strength, providing rigid support for the cone block 53 so that it can effectively break the slag. The huge impact force is jointly borne and buffered by the cone block 53, the buffer paper pad 52 and the protective seat 51, protecting the internal tubular resin sand 2 and the sensor.

[0049] After penetrating the slag layer, high-temperature molten steel enters the bottom of the protective tank; the protective paper tube 1 is quickly burned and melted by the molten steel, exposing the molten steel inlet 11, and the molten steel begins to flow into the tubular resin sand 2; the buffer paper pad 52 is eroded by the molten steel, and its structural strength begins to decrease rapidly, becoming compressible; at this time, the temperature inside the pressure chamber 511 increases, and the air pressure inside the pressure chamber 511 increases, and the heat is conducted through the hot melt pipe 64.

[0050] When the conical block 53 comes into contact with the unmelted solid metal block inside the molten steel, a violent collision occurs; the conical block 53 moves backward under the reverse impact force; the corroded buffer paper pad 52 can no longer provide support and is compressed; the pressure rod 531 connecting the conical block 53 then moves rapidly into the pressure chamber 511 like a piston; the movement of the pressure rod 531 instantly compresses the gas in the pressure chamber 511, generating a high-temperature, high-pressure airflow pulse, which rushes through the hot-melt pipe 64 towards the L-shaped hot-melt hole 611; the pressure of the high-temperature, high-pressure airflow pulse... Sufficient to push the opening and closing block 71 and overcome the force of the elastic element 72 to slide, instantly opening the hot melt hole 611 channel; the high-pressure and high-temperature airflow directly acts on the hot melt rubber block, causing it to melt or be blown open; after the sealing block 63 fails, the injection port 621 of the air pressure bladder 62 is opened, and the high-pressure gas pre-stored in the bladder is instantly ejected from the injection port 621 at high speed, generating a huge reaction thrust; this thrust acts on the mounting base 61, pushing the protective paper tube 1 to accelerate and continue to rush into the depth of the molten steel, ensuring that it reaches the specified depth where effective measurement can be performed.

[0051] Throughout the probe's penetration process, molten steel has filled the cavity inside the tubular resin sand 2 through the molten steel inlet 11; the internal carbon-fixing intelligent sensor 4 begins to work; the temperature-measuring thermocouple 41 directly measures the instantaneous temperature of the molten steel; the carbon-fixing thermocouple 42 records the cooling and solidification curve of the molten steel in the cavity, and by identifying its solidification plateau temperature, calculates the carbon content based on the functional relationship between carbon content and solidification point, and then transmits it through the high-temperature resistant cable 31, and through the end connector 33 to the external rapid analyzer for processing and display, ultimately guiding the steelmaking workers to complete the endpoint control.

[0052] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-precision carbon determination probe for use in a converter bombardment-type rapid analyzer, characterized in that: The device includes a protective paper tube (1) and tubular resin sand (2) and a signal transmission unit (3) arranged sequentially from bottom to top inside the protective paper tube (1); a carbon-fixing intelligent sensor (4) connected to the signal transmission unit (3) is arranged inside the tubular resin sand (2); a molten steel inlet (11) communicating with the inside of the tubular resin sand (2) is provided inside the protective paper tube (1); a metal detection head (12) is provided on the outside of the tubular resin sand (2); a protective unit (5) is provided at one end of the metal detection head (12) located outside the protective paper tube (1); a secondary injection unit (6) for pushing the protective paper tube (1) into the molten steel is provided at the top of the protective paper tube (1); The protective unit (5) includes a protective seat (51), a buffer paper pad (52), and a conical block (53) arranged sequentially from top to bottom along the axial direction of the protective paper tube (1); the protective seat (51) is located at the bottom of the metal detector head (12); The secondary injection unit (6) includes a mounting base (61), an air pressure bladder (62), and a sealing block (63); the mounting base (61) is disposed at the top end of the protective paper tube (1); the air pressure bladder (62) is disposed on the mounting base (61); the top end of the air pressure bladder (62) has an injection port (621); the sealing block (63) is disposed at the injection port (621); The sealing block (63) is a hot melt rubber block; the mounting base (61) has a hot melt hole (611); one end of the hot melt hole (611) is directly opposite the sealing block (63); the other end of the hot melt hole (611) is connected to one end of the hot melt tube (64); the other end of the hot melt tube (64) extends downward; the mounting base (61) is provided with an opening and closing unit (7); the opening and closing unit (7) is used to open or close the hot melt hole (611); The protective base (51) has a pressure chamber (511); the hot melt pipe (64) is connected to the pressure chamber (511); An expansion port communicating with the injection port (621) is provided on the top wall of the mounting base (61); The conical block (53) is provided with a pressure rod (531); one end of the pressure rod (531) passes through the buffer paper pad (52) and extends into the pressure chamber (511); The hot melt hole (611) is an L-shaped hole; the opening and closing unit (7) includes an opening and closing block (71) and an elastic element (72); the opening and closing block (71) is slidably disposed at the corner of the hot melt hole (611); the opening and closing block (71) is used to close or open the hot melt hole (611) after sliding; the two ends of the elastic element (72) are respectively connected to the opening and closing block (71) and the mounting base (61); the elastic element (72) is used to provide the force for the opening and closing block (71) to close the hot melt hole (611).

2. The high-precision carbon determination probe for a converter bombardment-type rapid analyzer according to claim 1, characterized in that: The signal transmission unit (3) includes a high-temperature resistant cable (31) and two positioning blocks (32); the high-temperature resistant cable (31) is coiled inside the protective paper tube (1); one end of the high-temperature resistant cable (31) is electrically connected to the carbon-fixing intelligent sensor (4), and the other end is connected to a connector (33); the two positioning blocks (32) are respectively disposed at both ends of the high-temperature resistant cable (31); and are respectively used to fix both ends of the high-temperature resistant cable (31) on the protective paper tube (1).

3. The high-precision carbon determination probe for a converter bombardment-type rapid analyzer according to claim 1, characterized in that: The fixed carbon intelligent sensor (4) includes a temperature measuring thermocouple (41) and a fixed carbon thermocouple (42) disposed in the tubular resin sand (2); the temperature measuring thermocouple (41) and the fixed carbon thermocouple (42) are electrically connected to the signal transmission unit (3) respectively.

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