Temperature detection device for recycling iron ore furnace

Abstract

The present invention belongs to the field of temperature detection devices, and specifically relates to a temperature detection device for a recycling iron-making furnace, comprising at least one infrared probe temperature measurement assembly. The infrared probe temperature measurement assembly comprises an outer shell, a core barrel group and an infrared temperature measurement probe. One end of the outer shell is an open end, and the other end is a closed end. The detection end of the infrared temperature measurement probe is close to the closed end and is provided with a window portion on the closed end. The axial cavity of the core barrel group can connect the open end and the closed end of the outer shell. The outer wall of the core barrel group is sealed and matched with the middle part of the inner wall of the outer shell. A hot air flow channel is formed on the inner half of the core barrel group and an exhaust pipe is provided on the outer shell to connect with the hot air flow channel. After the outer shell is fixed on the chimney and / or the burner hole cover, the infrared rays of the infrared temperature measurement probe are inclined upward and can be projected to the furnace lining at the top of the furnace cavity. The present invention achieves the purpose of continuous temperature measurement of the inner surface of the furnace lining and can continuously cool the infrared temperature measurement probe during operation.

Description

Technical Field

[0001] The invention belongs to the technical field of temperature detection of a recycling iron-making furnace, and in particular relates to a temperature detection device for a recycling iron-making furnace. Background Art

[0002] A reverberatory furnace is an energy-saving melting furnace developed based on the reverberator. It uses propane and natural gas as fuel for smelting metals, and pure oxygen is often used as a combustion aid. In addition to smelting cast iron, reverberatory furnaces can also be used to smelt non-ferrous metals such as copper, aluminum, tin, and lead, as well as cast steel. The main components of a reverberatory furnace include the furnace body, a drive assembly for rotating and tilting the furnace body, a movable or rotating fuel burner, and a movable chimney. Figure 1 As shown, the rotary ironmaking furnace 10 generally consists of three sections: the burner hole end, the middle section, and the exhaust hole end. A refractory lining 13 is built into the middle section of the furnace. The furnace body is equipped with process-related holes such as the burner hole 11, exhaust hole 12, and taphole. The burner 30 is mounted on the burner hole cover 20. Due to natural convection, the temperature at the top of almost all industrial heating furnaces, farther from the Earth's center, is always higher than at the bottom. The rotary motion of the furnace body drives the lining to rotate, constantly shifting its upper and lower positions, thereby ensuring that the temperatures of all linings within the furnace converge to a similar level. This similarity in lining temperature prevents damage caused by localized overheating and extends the lining's service life. Furthermore, the rotating lining plays a particularly important role in preventing overheating of the molten metal 100 at the bottom of the furnace (the temperature rise of the liquid metal during heating is called overheating). The portion of the furnace lining 13 that rotates to the top absorbs a large amount of heat energy released by the fuel, increasing its temperature. When it rotates to the bottom, it transfers its stored heat energy to the molten metal through heat exchange with the molten metal at the bottom, causing the molten metal temperature to continuously rise. The slag layer 101 always floats on the molten metal 100 at the bottom. Therefore, the rotation of the furnace body not only saves fuel but also extends the service life of the furnace lining.

[0003] During the heating and smelting process of a revolving iron-converting furnace, the furnace body rotates, with the burner hole cover 20 covering the burner hole 11 and the chimney 40 covering the exhaust hole 12. Due to the structural limitations of the revolving iron-converting furnace, it is impossible to use a temperature measuring instrument to detect the temperature within the furnace during heating. Specifically, it is impossible to detect the surface temperature of the furnace lining 13 and / or the temperature of the molten metal 100 at the bottom of the furnace. Currently, to measure the temperature within the furnace of a revolving iron-converting furnace, it is often necessary to wait until the fuel burner stops heating, or to move the burner hole cover 20 away from the burner hole 11, or to move the chimney 40 away from the exhaust hole 12. Then, passing through the burner hole 11 or exhaust hole 12, a temperature measuring instrument is used to measure the surface temperature of the furnace lining (at the top surface) within the furnace. During the aforementioned temperature measurement operation, to ensure that the discharge temperature of the molten metal accurately approaches the preset requirement, it is necessary to promptly use a temperature measuring device to measure the temperature of the furnace lining 13 after the burner stops heating and after the burner hole cover 20 or chimney 40 is removed. The progress of the entire operation process is very tight. Generally, it is necessary to measure continuously and repeatedly for at least three times until the relative difference between the three consecutive measurement values is within the required range. Therefore, the entire temperature measurement operation process is very tight. If there is a slight mistake, it needs to be restarted, which seriously restricts the efficiency of the temperature measurement operation. In the existing technology, there are a few implementation plans that detect the temperature of the furnace lining by installing infrared temperature probes on the furnace body. Although it overcomes the complicated problems of the commonly used temperature measurement methods, there are still some shortcomings: (1) The position of the infrared temperature probe relative to the furnace body is fixed, and the measured furnace lining temperature has a prominent position limitation. In order to overcome this limitation, it is necessary to arrange more infrared temperature probes around the furnace body, which not only increases the cost, but also adversely affects the strength and thermal insulation performance of the furnace body. The temperature drop point is prone to occur in the position range where the infrared probes are arranged; (2) The infrared temperature probe is directly installed on the furnace body, and its detection end is very close to the inner layer of the furnace lining. It is easy to be damaged and fail after being exposed to high temperature for a long time, resulting in a sharp increase in maintenance costs. Summary of the Invention

[0004] The present invention provides a temperature detection device for a recycling iron-making furnace. By adopting the technical means of arranging an infrared temperature measuring probe on the peripheral structure of the furnace body, the device achieves the purpose of continuous temperature measurement of the inner surface of the furnace lining and can continuously cool the infrared temperature measuring probe during operation, thereby prompting the infrared temperature measuring probe to operate in a low-temperature environment, effectively suppressing the damage of the infrared temperature measuring probe, and helping to reduce the cost of use and maintenance.

[0005] The present invention solves the technical problem by adopting a technical solution: a temperature detection device for a recycling iron-making furnace, comprising a recycling iron-making furnace, burner hole covers and a chimney correspondingly located at the burner holes and exhaust holes of the recycling iron-making furnace, and at least one infrared probe temperature measurement assembly. The infrared probe temperature measurement assembly comprises an outer shell, a core barrel assembly fixedly mounted within the outer shell, and an infrared temperature measurement probe fixedly mounted on the core barrel assembly.

[0006] One end of the outer shell is an open end, and the other end is a closed end. The detection end of the infrared temperature measuring probe is close to the closed end and a window portion for the infrared ray of the infrared temperature measuring probe to emit is provided on the closed end.

[0007] The axial cavity of the core barrel group is connected to the open end and the closed end of the outer shell, forming a cold air flow channel. Cold air is fed in from the open end of the outer shell, and reaches the closed end of the outer shell after passing through the axial cavity of the core barrel group. The middle part of the outer wall of the core barrel group is sealed and matched with the inner wall of the outer shell, and the axial cavity of the outer shell is divided into two non-connected sections to prevent the cold air fed to the closed end from flowing over a long distance toward the open end of the outer shell through the annular gap between the core barrel group and the outer shell, which adversely affects the cooling effect. A hot air flow channel is formed on the inner half of the barrel wall of the core barrel group, and the air inlet of the hot air flow channel is formed at the inner end of the core barrel group, that is, the air inlet is formed at one end of the core barrel group extending to the closed end. An exhaust pipe that passes into the outer shell is provided on the outer shell and is connected to the closed end of the hot air flow channel;

[0008] The outer shell is fixed at the corner of the chimney and / or fixed on the burner hole cover, so that the infrared rays emitted by the infrared temperature measuring probe are inclined upward and can reach the furnace lining wall at the top of the furnace chamber of the return iron converter.

[0009] Optionally, the outer shell includes a cylindrical outer shell body, and end caps and end barrels fixedly connected to both ends of the outer shell body. A window is formed on the bottom wall of the end cap. A radial flange 1 is formed within the axial cavity of the outer shell body, on a side proximal to the end cap. The core barrel assembly and radial flange 1 are matingly connected via a threaded structure, thereby dividing the axial cavity into two non-connected sections.

[0010] Optionally, the core barrel group includes core barrel one, end ring, core barrel two and core barrel three arranged in sequence in the axial direction.

[0011] The outer wall of the first core barrel seals against the inner wall of the outer shell, dividing the outer shell's axial cavity into two disconnected sections. Multiple communicating holes are distributed around the circumference of the first core barrel, with one end of the first core barrel positioned adjacent to the window and the other end fixedly connected to the end ring.

[0012] An annular groove is formed on the end ring, which can be connected to the same side end of each communication hole at the same time, and the exhaust pipe is connected to the annular groove. In this way, the communication hole and the annular groove form a hot air flow channel connected to the exhaust pipe.

[0013] Core barrel 2 is threadedly mated with core barrel 1, allowing one end of core barrel 2 to extend into core barrel 1 and mate with the infrared temperature probe. The infrared temperature probe is relatively fixed within the barrel cavity of core barrel 1, allowing the detection end of the infrared temperature probe to extend outside core barrel 1, corresponding to the window portion of the outer shell. The other end of core barrel 2 is fixedly connected to one end of core barrel 3, and the other end of core barrel 3 is fixed to the outer shell.

[0014] Optionally, a pair of radially opposed arm plates are formed on one end of the second core barrel extending into the first core barrel. The lengths of the arm plates extend in a direction aligned with the axial direction of the second core barrel. A probe retaining sleeve of the infrared temperature probe is positioned between the two arm plates and engages with the arm plates via a pivot portion provided on the probe retaining sleeve, enabling the infrared temperature probe to rotate in a vertical plane relative to the arm plates, thereby enabling the infrared temperature probe to rotate to different inclinations relative to the horizontal plane.

[0015] The probe fixing sleeve is formed with a connecting rod that passes through the barrel of core barrel two and extends into core barrel three. A gear portion is formed at the end of this connecting rod. Core barrel three is also provided with a rack unit. The rack body of the rack unit is arranged vertically and located within core barrel three, meshing with the gear portion.

[0016] The rods at the upper and lower ends of the rack body are both extended to the outside of the core barrel three and matched with the transmission part, so that the height position of the rack body in the vertical direction can be adjusted, so that the inclination amplitude of the infrared temperature measuring probe relative to the horizontal direction can be adjusted and controlled and fixed at different positions.

[0017] Optionally, the rod portion includes a screw portion 1 and a screw portion 2 fixedly disposed at the upper and lower ends of the rack body. The transmission portion on the screw portion 1 includes a spring and a nut 1. The two ends of the spring are in contact with the outer wall surfaces of the nut 1 and the core barrel 3, respectively. The transmission portion on the screw portion 2 is disposed outside the outer shell and includes a nut 2. It can also be understood that: the transmission portion on the screw portion 1 includes an externally threaded section on the screw portion 1, a nut 1 matching the externally threaded section, and a spring; the transmission portion on the screw portion 2 includes an externally threaded section on the screw portion 2 and a nut 2 configured on the externally threaded section.

[0018] Optionally, a plurality of fins are provided on the inner wall of the core barrel 1 and are alternately distributed around the circumference. The length direction of the fins is consistent with the axial direction of the core barrel 1, and the width direction is along the radial direction of the core barrel 1.

[0019] Optionally, a second tapered surface is formed at one end of the core barrel near the window portion and at the end of the outer peripheral surface. The small diameter end of the second tapered surface is a free end. One end of the communicating hole extends to the root of the second tapered surface.

[0020] Optionally, the infrared temperature measuring probe is pivotally matched with one end of the core barrel assembly close to the closed end of the outer shell, so that the infrared temperature measuring probe can rotate in a vertical plane. A gear portion is formed on one end side of the infrared temperature measuring probe.

[0021] A rack unit is mounted on the core barrel assembly. The rack unit's rack body is vertically arranged and located within the barrel cavity of the core barrel assembly near the open end of the outer shell. The rack body meshes with the gear assembly. Rods at the upper and lower ends of the rack body extend outside the core barrel assembly and mate with the transmission unit, allowing the rack body's vertical height to be adjusted, thereby controlling the tilt of the infrared temperature probe relative to the horizontal.

[0022] Optionally, the rod portion includes a first screw portion and a second screw portion fixedly mounted at the upper and lower ends of the rack body. The transmission portion of the first screw portion includes a spring and a first nut, with the ends of the spring respectively contacting the lower end surface of the first nut and the outer wall surface of the core barrel assembly. The transmission portion of the second screw portion is disposed outside the outer shell and includes a second nut.

[0023] Optionally, a heat insulating layer is provided on the outer wall of the outer shell, at least on one side close to the closed end of the outer shell. When the outer shell is fixed to the chimney or the burner hole cover, the axial extension length of the heat insulating layer can cover the entire contact surface between the outer shell and the chimney or the burner hole cover.

[0024] The beneficial effects of the present invention are as follows: the present invention achieves the purpose of real-time temperature measurement of the inner surface of the top of the furnace lining by adopting the means of arranging infrared temperature measuring probes on the peripheral structure of the furnace body, such as on the chimney, on the burner hole cover, etc., and can continuously cool the peripheral space of the infrared temperature measuring probe during operation, so as to prompt the infrared temperature measuring probe to operate in a relatively low temperature environment. Compared with the existing method of fixing the infrared temperature measuring probe on the furnace body to measure the temperature of the furnace lining, it can not only reduce the total usage of infrared temperature measuring probes, but also effectively prevent the infrared temperature measuring probes from being easily damaged due to long-term operation in a high-temperature environment, which helps to reduce the installation, use and maintenance costs of the temperature measuring mechanism. In addition, by driving the infrared temperature measuring probe to rotate in the vertical plane, the purpose of real-time temperature measurement of a large range of the top of the furnace lining can be achieved, which helps to more accurately control the temperature of the molten metal out of the furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the present invention in use state.

[0026] Figure 2This is a schematic diagram of the infrared probe temperature measurement assembly configured on the chimney.

[0027] Figure 3 This is a schematic diagram of the split structure of the infrared probe temperature measurement assembly (end tube not shown).

[0028] Figure 4 This is a structural diagram of an infrared temperature measuring probe pivotally matched with a second core barrel and configured on a first core barrel.

[0029] Figure 5 for Figure 4 The right side structural schematic diagram of the core barrel 1 is shown.

[0030] Figure 6 This is a schematic diagram of the main cross-sectional structure of core tube 2.

[0031] Figure 7 It is a schematic diagram of the right side structure of core tube 2.

[0032] Figure 8 This is a schematic diagram of the top view of the core tube 2.

[0033] In the figure: 100 molten metal at the bottom of the furnace, 101 slag layer;

[0034] 10 Circular iron-converting furnace, 11 burner hole, 12 tail gas hole, 13 furnace lining; 20 burner hole cover; 30 burner, 31 burner translation assembly; 40 chimney; 50 infrared probe temperature measurement assembly; 51 shell body, 511 axial cavity, 512 radial flange 1, 513 threaded countersunk hole, 514 flange end 1, 5141 countersunk hole, 515 insulation layer, 52 end cap, 521 axial flange 1, 522 window, 53 end tube, 531 flange end 2, 532 sealing gasket, 54 core tube 1, 541 annular countersunk hole, 542 threaded through hole, 543 first cone surface, 544 second cone surface, 545 connecting hole, 546 wing Plate, 55 end ring, 551 axial flange 2, 552 annular groove, 553 axial flange 3, 554 threaded surface boss, 56 exhaust pipe, 57 core barrel 2, 571 arm plate, 572 boss, 58 core barrel 3, 581 first annular flange, 582 second annular flange, 583 radial flange 2, 584 first through hole, 585 second through hole, 59 rack unit, 591 rack body, 592 screw part 1, 593 spring, 594 nut 1, 595 screw part 2, 596 nut 2; 60 infrared temperature probe, 61 probe fixing sleeve, 611 pivot part, 62 gear part; 70 target space. DETAILED DESCRIPTION

[0035] The structures, proportions, sizes, etc. illustrated in the drawings of the specification are only used to match the contents disclosed in the specification for understanding and reading by those familiar with this technology. They are not used to limit the conditions for implementation of the present invention and therefore have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose of the present invention. At the same time, terms such as "upper", "lower", "front", "back", and "middle" quoted in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments in their relative relationships should also be considered as the scope of implementation of the present invention without substantially changing the technical content.

[0036] like Figures 1 to 8 The temperature detection device of a recycling iron-making furnace shown includes a recycling iron-making furnace 10, a burner hole cover 20 and a chimney 40 corresponding to the burner hole 11 and the exhaust hole 12 of the recycling iron-making furnace 10, and two infrared probe temperature measurement assemblies 50. The two infrared probe temperature measurement assemblies 50 are respectively fixed at the corner positions of the chimney 40 and on the cover plate of the burner hole cover 20. The infrared probe temperature measurement assemblies 50 each include an outer shell, a core barrel group fixedly arranged in the outer shell, and an infrared temperature measurement probe 60 fixedly arranged on the core barrel group. The axial centerline extension directions of the outer shell and the core barrel group are both in the left-right direction and after assembly, the axial centerline of the outer shell is close to or coincides with the axial centerline of the core barrel group. The inner diameter of the outer shell is generally larger than the outer diameter of the core barrel group, and an annular gap area is formed at most positions between the relative circumferences of the two to play a heat insulation role.

[0037] The outer shell has an open left end and a closed right end. The open end is connected to an external cold air source, while the closed end is embedded in the chimney 40 wall or the cover plate of the burner hole cover 20. The infrared temperature probe 60 has its detection end positioned near the closed end of the outer shell, and a window 522 is provided on the closed end plate for infrared radiation emitted by the infrared temperature probe 60 to pass through. The window 522 is made of a high-temperature-resistant transparent material.

[0038] The axial cavity of the core barrel group can connect the open end and the closed end of the outer shell to form a cold air flow channel. The middle part of the outer wall of the core barrel group is sealed and matched with the inner wall of the outer shell, and the axial cavity 511 of the outer shell is divided into two non-communicating left and right sections to prevent the cold air delivered to the closed end from flowing too long a distance toward the open end of the outer shell through the annular gap area between the core barrel group and the outer shell, thereby adversely affecting the cooling effect. Preferably, the position where the core barrel group is sealed and matched with the outer shell divides the axial cavity 511 of the outer shell into two non-communicating left and right sections, and the axial length of the left section is significantly greater than the axial length of the right section.

[0039] A hot air flow channel is formed on the inner half wall of the core barrel group, and an air inlet of the hot air flow channel is formed at the inner end of the core barrel group. Figures 1 to 5 As shown, the air inlet of the hot air flow channel is the right end of the communication hole 545. An exhaust pipe 56 is provided on the outer shell and extends into the outer shell. The inner end of the exhaust pipe 56 is connected to the closed end of the hot air flow channel, and the outer end of the exhaust pipe 56 extends to the outside of the outer shell.

[0040] The two outer shells are fixed at the corners of the chimney 40 and on the burner hole cover 20 respectively, and the infrared rays emitted by the two infrared temperature measuring probes 60 are inclined upward and can reach the wall surface of the furnace lining 13 at the top of the furnace chamber of the return iron furnace 10. Figure 1 The dashed line is shown.

[0041] As in the prior art, the burner 30 is fixed to the burner hole cover 20, and the burner hole cover 20 and the burner 30 are jointly fixed to the burner translation assembly 31. The burner translation assembly 31 controls the burner hole cover 20 to block the burner hole 11 and to move away from the burner hole 11. Similarly, the chimney 40 is also equipped with a movement assembly, which controls the chimney 40 to be moved toward and away from the exhaust hole 12.

[0042] In the above technical solution, cold air is introduced into the axial cavity of the core barrel group from the left end of the outer shell and flows to the right along the axial cavity of the core barrel group to the right end of the outer shell, that is, the position of the target space 70 in the figure. At the target interval 70, the cold air is mixed with the hot air surrounding the infrared temperature probe 60 by convection. The hot air formed after heating enters the hot air flow channel from the air inlet of the hot air flow channel, flows to the left along the hot air flow channel, and is finally discharged to the outside from the exhaust pipe 56. During operation, cold air is continuously fed into the axial cavity of the core barrel group to cool the space around the infrared temperature probe 60, and the hot air is continuously discharged in time through the hot air flow channel. In the cold air delivery path, with the help of the annular gap area formed between the outer shell and the core barrel group, temperature insulation is effectively achieved, which helps to ensure that the cold air delivered to the target space 70 is in a good low temperature state, and can ensure the cooling effect achieved in the target space 70. The outer shell and the core barrel assembly can both be made of high-temperature resistant heat-insulating materials.

[0043] like Figures 2 to 3 As shown, the outer shell includes a cylindrical outer shell body 51, and end caps 52 and end cylinders 53 respectively fixedly connected to the left and right ends of the outer shell body 51. The window portion 522 is formed on the bottom wall of the end cap 52.

[0044] A radial flange 1 512 is formed within the axial cavity 511 of the housing body 51, on one side near the end cap 52. The core barrel assembly and the radial flange 1 512 are connected together via a threaded structure, thereby separating the axial cavity 511 into two non-connected sections at the radial flange 1 512.

[0045] The end cap 52 has an axial flange 521 formed on one end facing the housing body 51, and external threads are formed on the outer wall of the axial flange 521. Correspondingly, a threaded counterbore 513 is formed at the end of the housing body 51 where it interfaces with the end cap 52. The axial flange 521 mates with the threaded counterbore 513 to secure the end cap 52 to the housing body 51.

[0046] At the ends where the end tube 53 and the shell body 51 are connected, flange end 2 531 and flange end 1 514 are respectively formed, and the end tube 53 and the shell body 51 are connected as a whole through the flange ends, and a sealing gasket 532 is provided between the two flange ends.

[0047] On the outer wall of the outer shell, at least on the side close to the closed end of the outer shell, a heat insulating layer 515 is provided. That is, on the outer wall of the outer shell body 51, at least on the side close to the end cap 52, a heat insulating layer 515 is provided. Figure 1 As shown, when the outer shell is fixed on the chimney 40, the axial extension length of the thermal insulation layer 515 can cover the entire contact surface between the outer shell and the chimney 40, thereby achieving a good thermal insulation effect.

[0048] The core barrel assembly includes core barrel 1 54, end ring 55, core barrel 2 57, and core barrel 3 58. The inner diameter of core barrel 3 58 is larger than the inner diameter of core barrel 1 54. The inner diameter of core barrel 1 54 is larger than the outer diameter of core barrel 2 57. The barrel cavity of core barrel 2 57 can be trumpet-shaped.

[0049] The outer wall of the core barrel 54 seals against the inner wall of the outer shell, dividing the outer shell's axial cavity 511 into two disconnected left and right sections. Specifically, a radial flange 512 formed on the outer shell body 51 is internally threaded, and correspondingly, an external thread is formed on the outer circumference of the core barrel 54. Thus, the core barrel 54 and radial flange 512 can be fixedly connected via the threaded structure, and the axial position of the core barrel 51 within the outer shell body 51, i.e., their relative position in the left-right direction, can be adjusted.

[0050] The core barrel 54 is provided with a plurality of communication holes 545 spaced apart around its circumference. These communication holes 545 penetrate both end surfaces of the core barrel 54. After assembly, one end of the core barrel 54 is positioned adjacent to the window 522, extending into the cavity of the end cap 52 and adjacent to the inner bottom surface of the end cap 52.

[0051] The other end of the core barrel 1 54 is fixedly connected to the end ring 55. Specifically, an annular countersunk hole 541 is formed on the end surface of the core barrel 1 54 facing the end ring 55, and a corresponding axial flange 551 is formed on the end surface of the end ring 55. The annular countersunk hole 541 and the axial flange 551 are mated via a threaded structure, thereby securing the end ring 55 to the left end of the core barrel 1 54.

[0052] The end ring 55 is formed with an annular recessed groove 552 that is simultaneously connected to the same-side ends of each communication hole 545, and allows the exhaust pipe 56 to communicate with the annular recessed groove 552. Specifically, the end ring 55 is formed with an annular threaded boss 551. The end of the exhaust pipe 56 is provided with an internal threaded surface segment that corresponds to the threaded boss 551.

[0053] To enhance the sealing effect at the butt joint between the annular countersunk groove 552 and the communicating hole 545 and prevent hot air from leaking into the axial cavity 511 of the outer shell, an annular axial flange 3 553 is formed at the edge of the end surface of the end ring 55 facing the core barrel 1 54. The ipsilateral end ports of each communicating hole 545 are correspondingly distributed between the axial flange 3 553 and the axial flange 2 551. The inner circumferential surface of the axial flange 3 553 is an annular conical surface with the larger diameter end facing outward. Correspondingly, a first conical surface 543 is formed at the end of the core barrel 54 to match the axial flange 3 553. When the axial flange 2 551 is screwed into the annular countersunk hole 541, the annular conical surface of the axial flange 3 553 gradually approaches the first conical surface 543 and ultimately fully fits the first conical surface 543. A sealing ring is fixedly provided on the first conical surface 543 , and when the annular conical surface of the axial flange 553 contacts the first conical surface 543 , the sealing ring can be elastically deformed.

[0054] Core barrel 2 57 mates with core barrel 1 54 via a threaded structure, allowing one end (the right end) of core barrel 2 57 to extend into core barrel 1 54 and mate with the infrared temperature probe 60. Specifically, a threaded through-hole 542 is formed at the end of core barrel 1 54 facing the end ring 55, at the port end. The inner diameter of threaded through-hole 542 is smaller than that of core barrel 1 54. The outer wall of core barrel 2 57 is formed with an external threaded surface, which mates with threaded through-hole 542, allowing core barrel 2 57 to be connected to core barrel 1 54 via the threaded structure. Therefore, the axial position / left-right position of core barrel 2 57 relative to core barrel 1 54 can be adjusted, thereby adjusting the position of the infrared temperature probe 60's detection end extending into the closed end of the outer shell, that is, the position of the infrared temperature probe 60's detection end extending into the cap cavity of the end cap 52.

[0055] The other end (left end) of the second core barrel 57 is fixedly connected to one end (right end) of the third core barrel 58. The other end (left end) of the third core barrel 58 is fixed to the outer shell. Specifically, a second radial flange 583 is formed at the end of the third core barrel 58 facing the second core barrel 57. This second radial flange 583 has an internal threaded surface that mates with the external threaded surface on the outer wall of the second core barrel 57, connecting the second core barrel 57 and the third core barrel 58 at their opposite ends. A first annular flange 581 is formed at the other end of the third core barrel 58, correspondingly formed with a counterbore 5141 at the end of the outer shell body 51. The first annular flange 581 can be inserted into the counterbore 5141 and, after the end barrel 53 is butt-jointed with the outer shell body 51, is clamped between the two flange ends, thereby securing the left end of the third core barrel 58.

[0056] To facilitate assembly, a second annular flange 582 is formed at one end of the core barrel 3 58 extending into the outer shell body 51, and the outer diameter of the second annular flange 582 is aligned with the inner diameter of the axial cavity 511. To improve the cooling effect of the cold air within the target space 70 on the closed end of the outer shell, i.e., near the cap cavity side of the end cap 52, a plurality of fins 546 are provided on the inner wall of the core barrel 1 54 and spaced apart around the circumference. The length direction of the fins 546 is aligned with the axial direction of the core barrel 1 54, and the width direction is radially aligned with the core barrel 1 54. The provision of the fins 546 increases the heat exchange surface of the cold air.

[0057] In order to promote the hot air to flow into the connecting hole 545 quickly and be discharged to the outside through the exhaust pipe 56, a second conical surface 544 is formed at one end of the core barrel 1 54 close to the window portion 522 and at the end of the outer peripheral surface, and the small diameter end of the second conical surface 544 is made a free end to increase the relative circumferential surface distance between the core barrel 1 54 and the end cap 52, so as to promote the hot air flow to converge at the port of the connecting hole 545. One end of the connecting hole 545 extends to the root of the second conical surface 544. A fan (such as a duct fan) is connected to the exhaust pipe 56. When the fan is started, a heat exchange airflow can be formed in the axial cavity of the core barrel group, the connecting hole 545 and the annular sink 552, and the cold air is continuously introduced and the hot air is discharged in a cycle.

[0058] like Figures 2 to 8As shown, a pair of radially opposed arm plates 571 are formed at one end (the right end) of the second core barrel 57 that extends into the first core barrel 54. The probe fixing sleeve 61 of the infrared temperature probe 60 is correspondingly positioned between the two arm plates 571. The probe fixing sleeve 61 mates with the arm plates 571 via a pivot portion 611 provided on the probe fixing sleeve 61, allowing the infrared temperature probe 60 to rotate vertically relative to the arm plates 571. This allows the infrared light emitted by the infrared temperature probe 60 to tilt to different angles relative to the horizontal, enabling temperature measurement at multiple locations on the top furnace lining 13. Each arm plate 571 is formed with a boss 572, each with an axial hole structure that mates with the pivot portion 611.

[0059] A connecting rod is formed on the probe fixing sleeve 61, which passes through the barrel cavity of the core barrel 2 57 and extends into the core barrel 3 58. A gear portion 62 is formed at the end of the connecting rod. Correspondingly, a rack unit 59 is provided on the core barrel 3 58. The rack body 591 of the rack unit 59 is arranged in the vertical direction and is provided in the core barrel 3 58, and can be engaged and matched with the gear portion 62. The rod portions provided at the upper and lower ends of the rack body 591 are both extended to the outside of the core barrel 3 58 and matched with the transmission portion, and the height position of the rack body 591 in the vertical direction can be adjusted, so that the inclination amplitude of the infrared temperature measuring probe 60 relative to the horizontal direction can be adjusted and controlled.

[0060] The rod portion includes a screw portion 592 and a screw portion 595 respectively fixed to the upper end and the lower end of the rack body 591.

[0061] The light column segment of the screw part 592 passes through the first through hole 584 provided on the core barrel 3 58, and the external thread segment thereon is relatively located in the annular gap area between the core barrel 3 58 and the shell body 51. A transmission part is provided on the external thread segment of the screw part 592, and the transmission part includes a spring 593 and a nut 594. The two ends of the spring 593 are in contact with the lower end surface of the nut 594 and the outer wall surface of the core barrel 3 58 respectively. By screwing the nut 594 and adjusting its height position relative to the external thread segment on the screw part 592, the initial / original compression degree of the spring 593 can be adjusted. A sealing ring is provided on the first through hole 584, and a sealing structure is formed between the light column segment of the screw part 592 and the relative circumferential surface of the first through hole 584.

[0062] The light column segment on the second screw part 595 passes through the second through hole 585 provided on the third core tube 58. Similarly, a sealing ring is provided on the second through hole 585, and a sealing structure is formed between the light column segment of the second screw part 595 and the relative circumferential surface of the second through hole 585. The lower end of the second screw part 595 passes through the annular gap area between the third core tube 58 and the shell body 51 and then passes out to the outside of the shell body 51. In addition, the external thread segment provided on the second screw part 595 is relatively located outside the shell body 51, and the transmission part provided on the external thread segment includes a second nut 596. By screwing the second nut 596 and adjusting its height position relative to the external thread segment on the second screw part 595, the second screw part 595 can be pushed and pulled to move downward, thereby driving the rack body 591 to move in the vertical direction, so that its meshing position with the gear part 62 changes, and can promote the rotation of the infrared temperature measuring probe 60. The stretching elastic force of the spring 593 forms a pulling force that drives the rack body 591 to return upward.

[0063] A gear body can be fixedly set on the nut 2 596, and a rack transmission unit can be configured corresponding to the gear body. The gear body is driven by the rack transmission unit to rotate (around the vertical axis) to make the nut 2 596 rotate synchronously to adjust the height position of the nut 2 596 relative to the screw part 2 595, thereby realizing automatic adjustment and control of the inclination angle of the infrared temperature measuring probe 60 relative to the horizontal direction, and can automatically monitor the temperature of a section on the top furnace lining 13 in real time, thereby increasing the temperature detection range, which helps to control the discharge temperature of the molten metal more reliably and accurately.

[0064] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. The present invention can be improved in many aspects without violating the overall concept. Those skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed by the present invention shall be covered by the claims of the present invention.

Claims

1. A temperature detection device for a recycling iron-making furnace, comprising a recycling iron-making furnace (10), a burner hole cover (20) and a chimney (40) correspondingly arranged at a burner hole (11) and an exhaust hole (12) of the recycling iron-making furnace (10); characterized in that: It also includes at least one infrared probe temperature measurement assembly (50); the infrared probe temperature measurement assembly (50) includes an outer shell, a core barrel group fixedly arranged in the outer shell, and an infrared temperature measurement probe (60) fixedly arranged on the core barrel group; One end of the outer shell is an open end, and the other end is a closed end; the detection end of the infrared temperature probe (60) is close to the closed end and a window portion (522) for infrared emission is provided on the closed end; the axial cavity of the core barrel group is connected to the open end and the closed end of the outer shell, forming a cold air flow channel; the outer wall of the core barrel group is sealed and matched with the inner wall of the outer shell; a hot air flow channel is formed on the inner half of the barrel wall of the core barrel group, and the air inlet of the hot air flow channel is formed at the inner end of the core barrel group; an exhaust pipe (56) is provided on the outer shell and is connected to the closed end of the hot air flow channel. The outer shell is fixed at a corner position of the chimney (40) and / or fixed on the burner hole cover (20), so that the infrared rays emitted by the infrared temperature measuring probe (60) are inclined upward and can reach the furnace lining (13) at the top of the furnace chamber of the return iron furnace (10); The outer shell includes a cylindrical outer shell body (51), and end caps (52) and end cylinders (53) fixedly connected to both ends of the outer shell body (51); a window portion (522) is formed on the bottom wall of the end cap (52); A radial flange (512) is formed in the axial cavity (511) of the shell body (51) and on one side close to the end cap (52); the core barrel assembly and the radial flange (512) are connected together by a threaded structure, thereby blocking the axial cavity (511) into two unconnected sections; The core barrel assembly includes a core barrel 1 (54), an end ring (55), a core barrel 2 (57) and a core barrel 3 (58); The outer wall of the core barrel (54) is sealed and matched with the inner wall of the outer shell; a plurality of communication holes (545) are distributed on the wall of the core barrel (54) and one end of the core barrel (54) is close to the window portion (522), and the other end is fixedly connected to the end ring (55); An annular recessed groove (552) is formed on the end ring (55) and is capable of communicating with the same side ends of each communication hole (545) at the same time, and the exhaust pipe (56) is connected to the annular recessed groove (552); Core barrel 2 (57) and core barrel 1 (54) are matched with each other through a threaded structure, so that one end of core barrel 2 (57) extends into core barrel 1 (54) and matches with the infrared temperature measuring probe (60), and the other end is fixedly connected to one end of core barrel 3 (58); the other end of core barrel 3 (58) is fixed to the outer shell; A pair of arm plates (571) are formed at one end of the second core barrel (57) extending into the first core barrel (54); the infrared temperature measuring probe (60) is correspondingly arranged between the two arm plates (571) and matched with the arm plates (571) through a pivot portion (611) provided on the probe fixing sleeve (61), so that the infrared temperature measuring probe (60) can rotate relative to the arm plates (571) in a vertical plane; A connecting rod is formed on the probe fixing sleeve (61) and passes through the barrel cavity of the second core barrel (57) and extends to the third core barrel (58); a gear portion (62) is formed at the end of the connecting rod; A rack unit (59) is provided on the core barrel three (58); the rack body (591) of the rack unit (59) is arranged in the vertical direction and is provided in the core barrel three (58), and can be meshed with the gear part (62); the rod parts provided at the upper and lower ends of the rack body (591) are both extended to the outside of the core barrel three (58) and matched with the transmission part, and can adjust the height position of the rack body (591) in the vertical direction, thereby regulating the tilt amplitude of the infrared temperature measuring probe (60) relative to the horizontal direction.

2. The temperature detection device for a recycling iron ore furnace according to claim 1, characterized in that: The rod portion includes a screw portion 1 (592) and a screw portion 2 (595) fixedly arranged at the upper and lower ends of the rack body (591); the transmission portion on the screw portion 1 (592) includes a spring (593) and a nut 1 (594), so that the two ends of the spring (593) are in contact with the nut 1 (594) and the core barrel 3 (58) respectively; the transmission portion on the screw portion 2 (595) includes a nut 2 (596).

3. The temperature detection device for a recycling iron-making furnace according to claim 1, characterized in that: A plurality of fin plates (546) are provided on the inner wall of the core barrel (54) and are distributed alternately in the circumferential direction; the length direction of the fin plates (546) is consistent with the axial direction of the core barrel (54), and the width direction is along the radial direction of the core barrel (54).

4. The temperature detection device for a recycling iron-making furnace according to claim 1, characterized in that: A second conical surface (544) is formed at one end of the core tube (54) close to the window portion (522) and at the end of the outer peripheral surface; the small diameter end of the second conical surface (544) is a free end; and one end port of the connecting hole (545) extends to the root of the second conical surface (544).

5. A temperature detection device for a recycling iron-making furnace, comprising a recycling iron-making furnace (10), a burner hole cover (20) and a chimney (40) correspondingly arranged at a burner hole (11) and an exhaust hole (12) of the recycling iron-making furnace (10); characterized in that: It also includes at least one infrared probe temperature measurement assembly (50); the infrared probe temperature measurement assembly (50) includes an outer shell, a core barrel group fixedly arranged in the outer shell, and an infrared temperature measurement probe (60) fixedly arranged on the core barrel group; One end of the outer shell is an open end, and the other end is a closed end; the detection end of the infrared temperature probe (60) is close to the closed end and a window portion (522) for infrared emission is provided on the closed end; the axial cavity of the core barrel group is connected to the open end and the closed end of the outer shell, forming a cold air flow channel; the outer wall of the core barrel group is sealed and matched with the inner wall of the outer shell; a hot air flow channel is formed on the inner half of the barrel wall of the core barrel group, and the air inlet of the hot air flow channel is formed at the inner end of the core barrel group; an exhaust pipe (56) is provided on the outer shell and is connected to the closed end of the hot air flow channel. The outer shell is fixed at a corner position of the chimney (40) and / or fixed on the burner hole cover (20), so that the infrared rays emitted by the infrared temperature measuring probe (60) are inclined upward and can reach the furnace lining (13) at the top of the furnace chamber of the return iron furnace (10); The outer shell includes a cylindrical outer shell body (51), and end caps (52) and end cylinders (53) fixedly connected to both ends of the outer shell body (51); a window portion (522) is formed on the bottom wall of the end cap (52); A radial flange (512) is formed in the axial cavity (511) of the shell body (51) and on one side close to the end cap (52); the core barrel assembly and the radial flange (512) are connected together by a threaded structure, thereby blocking the axial cavity (511) into two unconnected sections; The core barrel assembly includes a core barrel 1 (54), an end ring (55), a core barrel 2 (57) and a core barrel 3 (58); The outer wall of the core barrel (54) is sealed and matched with the inner wall of the outer shell; a plurality of communication holes (545) are distributed on the wall of the core barrel (54) and one end of the core barrel (54) is close to the window portion (522), and the other end is fixedly connected to the end ring (55); An annular recessed groove (552) is formed on the end ring (55) and is capable of communicating with the same side ends of each communication hole (545) at the same time, and the exhaust pipe (56) is connected to the annular recessed groove (552); Core barrel 2 (57) and core barrel 1 (54) are matched with each other through a threaded structure, so that one end of core barrel 2 (57) extends into core barrel 1 (54) and matches with the infrared temperature measuring probe (60), and the other end is fixedly connected to one end of core barrel 3 (58); the other end of core barrel 3 (58) is fixed to the outer shell; The infrared temperature measuring probe (60) is pivotally matched with one end of the core barrel assembly close to the closed end of the outer shell, so that the infrared temperature measuring probe (60) can rotate in a vertical plane; a gear portion (62) is formed on one end side of the infrared temperature measuring probe (60); A rack unit (59) is provided on the core barrel assembly; a rack body (591) of the rack unit (59) is arranged in a vertical direction and is provided in a barrel cavity of the core barrel assembly near the open end of the outer shell; the rack body (591) can be meshed and matched with the gear part (62); the rod parts provided at the upper and lower ends of the rack body (591) are both extended to the outside of the core barrel assembly and matched with the transmission part, and the height position of the rack body (591) in the vertical direction can be adjusted to control the tilt amplitude of the infrared temperature measuring probe (60) relative to the horizontal direction.

6. The temperature detection device for a recycling iron-making furnace according to claim 5, characterized in that: The rod portion includes a screw portion 1 (592) and a screw portion 2 (595) fixedly arranged at the upper and lower ends of the rack body (591); the transmission portion on the screw portion 1 (592) includes a spring (593) and a nut 1 (594); the two ends of the spring (593) are in contact with the nut 1 (594) and the outer wall surface of the core barrel assembly respectively; the transmission portion on the screw portion 2 (595) is arranged outside the outer shell and includes a nut 2 (596).

7. The temperature detection device for a recycling iron-making furnace according to claim 1 or 5, characterized in that: A heat insulating layer (515) is provided on the outer wall of the outer shell at least on one side close to the closed end thereof.

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