Temperature control structure of smelting furnace for stainless steel production

Abstract

The present application belongs to the technical field of metal smelting, and in particular to a temperature control structure of a smelting furnace for stainless steel production, which solves the problems of large temperature fluctuation caused by raw material input, unadjustable cooling intensity, and fixed jet characteristics of the oxygen lance nozzle in the prior art. The structure comprises a furnace body, a furnace cover, a feed pipe, a feed hopper, and a heating structure. The heating structure uses high-temperature flue gas in the furnace to heat the raw materials. The oxygen injection structure adjusts the internal mechanical geometric relationship to change the oxygen jet characteristics and control the temperature field distribution. The cooling structure uses a paraffin temperature sensing element to adjust the cooling intensity according to the temperature of the outer wall of the furnace body. The structure controls the temperature by physical means, reduces temperature fluctuations, improves the uniformity of stainless steel composition, reduces smelting costs, and improves production efficiency.

Description

Technical Field

[0001] This invention relates to the field of metal smelting technology, and in particular to a temperature control structure for a smelting furnace used in stainless steel production. Background Technology

[0002] In the stainless steel production process, temperature control of the smelting furnace is a key factor affecting the quality of stainless steel and production efficiency.

[0003] Existing stainless steel smelting furnaces have many shortcomings in temperature control:

[0004] 1. In the existing technology, during the use of smelting furnaces, cold alloy blocks are usually directly put into the furnace, which causes drastic fluctuations in the temperature of the molten pool and affects the uniformity of the stainless steel composition. Although there is an independent raw material baking device in the existing technology, it is separate from the furnace body, which increases the equipment footprint and smelting cost, and the thermal energy utilization rate is low.

[0005] 2. Furnace cooling is usually done by water or air cooling. Regardless of whether the temperature is uniform throughout the furnace wall, the cooling intensity is the same. This results in significant heat loss in areas that should not be cooled, and insufficient cooling in areas of excessively high temperature (hot spots) on the furnace wall.

[0006] 3. In the oxygen injection process, traditional oxygen injection methods are relatively simple, with a fixed form of oxygen entering the furnace. This makes it impossible to flexibly adjust the distribution and reaction of oxygen in the furnace according to the actual needs of the smelting process. This may lead to uneven temperature distribution in the furnace, with local temperatures being too high or too low, affecting the smelting effect and making it difficult to guarantee the uniformity of the stainless steel composition.

[0007] 4. Some temperature control structures rely on circuits or electronic components to achieve linkage and regulation. Under the harsh working conditions of high temperature and high dust in smelting furnaces, electronic components are prone to damage, leading to control failure and high maintenance costs. Summary of the Invention

[0008] The purpose of this invention is to address the shortcomings of existing smelting furnaces for stainless steel production, such as large temperature fluctuations during raw material input, inability to adjust cooling intensity, and fixed oxygen lance nozzle jet characteristics.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A temperature control structure for a stainless steel smelting furnace includes a furnace body, the top of which is provided with a furnace cover.

[0011] A feed pipe is fixedly inserted through the furnace cover, and a feed hopper is fixed to the top of the feed pipe. The feed pipe and the feed hopper are used together to feed raw materials into the furnace body.

[0012] The heating structure is disposed on the outer wall of the feed pipe, including a flue. The flue is fixed on the outer wall of the feed pipe and located above the furnace cover. A heat exchange flue is formed between the flue and the feed pipe to introduce high-temperature flue gas into the furnace and heat the raw materials in the feed pipe.

[0013] The oxygen injection structure includes an oxygen pipe that is fixedly inserted through the furnace body for injecting oxygen into the furnace body to physically regulate the temperature.

[0014] The cooling structure includes an annular air duct and an annular air box. The annular air box is fixedly sleeved on the outer wall of the furnace body, and the annular air duct is sleeved on the outer wall of the annular air box, which is used to adjust the cooling intensity according to the temperature of the outer wall of the furnace body.

[0015] In one possible design, the heating structure further includes an upper sealing plate and a lower sealing plate, which are slidably disposed within the feed pipe, forming a drying chamber between the upper and lower sealing plates to accommodate the raw material to be heated; multiple flue gas pipes communicating with the furnace cover are fixed at the bottom of the exhaust stack; a spiral guide plate I is fixed inside the heat exchange flue to extend the residence time of the high-temperature flue gas and heat the raw material in the drying chamber through heat conduction; an exhaust pipe is fixedly connected to one side of the exhaust stack for discharging the flue gas.

[0016] In one possible design, the heating structure further includes two fixed plates, a hydraulic cylinder, and a connecting rod. The two fixed plates are arranged vertically and fixed to one side of the feed pipe. The hydraulic cylinder is fixed to the fixed plate via a frame. The connecting rod is connected to the output shaft of the hydraulic cylinder and slidably passes through the fixed plate. An upper connecting plate and a lower connecting plate are fixed to one side of the upper and lower closing plates, respectively. The upper and lower connecting plates are fixedly connected to the corresponding connecting rods.

[0017] The hydraulic cylinder drives the upper or lower sealing plate to move, thereby alternately opening the feed pipe to prevent cold air from flowing back into the furnace body.

[0018] In one possible design, the oxygen injection structure further includes a nut block, a threaded rod, a spiral guide plate II, and a conical head;

[0019] The nut block is fixed at the end of the oxygen pipe away from the furnace body, the threaded rod is threaded through the nut block and extends into the oxygen pipe, and the spiral guide plate II is rotatably connected to the end of the threaded rod and slidably disposed in the oxygen pipe.

[0020] The conical head is fixed to one end of the oxygen pipe that extends into the furnace body;

[0021] One end of the spiral guide plate II is fixed with a conical spiral guide plate, which is matched with a conical head;

[0022] The rotating threaded rod drives the spiral guide plate II and the conical spiral guide plate to move relative to the conical head to change the oxygen flow pattern: when the conical spiral guide plate is close to the conical head, the oxygen rotates in a spiral to form an umbrella-shaped diffused flame for heat preservation; when the conical spiral guide plate is far away from the conical head, the oxygen direct jet is used for local heating.

[0023] In one possible design, the cooling structure further includes multiple channels, the two ends of which are fixedly connected to an annular air duct and an annular air box, respectively.

[0024] The annular air box is provided with multiple air chambers, and the channel is connected to the air chambers to introduce cold air from the annular air duct into the air chambers to directly cool the outer wall of the furnace.

[0025] In one possible design, the cooling structure also includes multiple mounting plates, paraffin temperature sensing elements, retaining rings, and enclosing discs;

[0026] The mounting plate is fixed inside the channel, the paraffin temperature sensing element is fixed on the mounting plate, and the temperature sensing probe of the paraffin temperature sensing element penetrates the mounting plate and extends into the air cavity, and contacts the outer wall of the furnace body.

[0027] The fixing ring is fixed inside the channel, and the piston rod of the paraffin temperature sensing element passes through the fixing ring and is fixedly connected to the closed disc;

[0028] When the temperature of the outer wall of the furnace rises, the temperature-sensing paraffin inside the paraffin temperature-sensing element expands and pushes the piston rod, causing the closed disc to move away from the fixed ring to expand the gap and increase the cooling air flow.

[0029] In one possible design, a plurality of arc-shaped blocks are fixed to the side of the fixing ring away from the paraffin temperature sensing element, and ventilation gaps are formed between the plurality of arc-shaped blocks;

[0030] When the closed plate comes into contact with the arc-shaped block, cooling air enters the air cavity through the ventilation gap, so that the outer wall of the furnace is cooled evenly.

[0031] In one possible design, the top and bottom inner walls of the air cavity are provided with multiple exhaust holes for air circulation to remove heat.

[0032] It also includes multiple air guide pipes and air injection pipes. Adjacent annular air ducts are connected by air guide pipes. The air injection pipe is fixedly connected to an annular air duct and connected to an external exhaust fan for introducing cold air.

[0033] In one possible design, a graphite sealing ring is fixed to the inner wall of the oxygen tube on the side away from the conical head, and the threaded rod passes through the graphite sealing ring to seal the gap between the threaded rod and the oxygen tube to prevent oxygen leakage.

[0034] In one possible design, it also includes vertical bars, horizontal plates, and a drive plate;

[0035] The same vertical rod is slidably passed through the two fixed plates, and a horizontal plate is fixed to the bottom of the vertical rod, with the horizontal plate located above the lower connecting plate;

[0036] Both sides of the bottom of the horizontal plate are fixed with drive plates, and the lower connecting plate is located between the two drive plates. The two drive plates are provided with inclined grooves on the side that is close to each other.

[0037] The pin is fixed through the lower connecting plate and slides within the inclined groove;

[0038] The upper connecting plate is provided with a limiting groove, and the vertical rod is inserted into the limiting groove.

[0039] When the upper connecting plate moves, the pin slides along the inclined groove to drive the vertical rod to rise and insert into the limiting groove, thereby locking the upper connecting plate and preventing the upper closing plate from opening.

[0040] Beneficial effects: In this invention, the waste heat of the high-temperature flue gas in the furnace body is recovered through the heat exchange flue of the heating structure, and the raw materials fed into the furnace body are preheated, reducing the temperature difference between the raw materials and the high-temperature environment inside the furnace, and physically reducing the peak value of temperature fluctuation; at the same time, the alternating opening and closing of the upper and lower sealing plates prevents cold air from flowing back into the furnace body during the raw material feeding process, further reducing the temperature fluctuation range inside the furnace and improving temperature stability.

[0041] In this invention, by changing the internal mechanical geometry of the oxygen pipe, i.e., adjusting the distance between the spiral guide plate II and the conical spiral guide plate and the conical head, different oxygen injection methods can be achieved in the furnace. When the oxygen rotates in a spiral, it forms an umbrella-shaped diffused flame with a large coverage area and a mild reaction, which can be used for heat preservation or temperature homogenization. When oxygen is injected directly, the airflow is similar to a direct current jet with strong penetration, the reaction is concentrated in the depth of the molten pool, the temperature rises quickly, and local high temperatures can be formed. This flexible oxygen injection method can precisely control the temperature field distribution in the furnace according to different smelting stages and process requirements, improve the smelting effect, and ensure the uniformity of stainless steel composition.

[0042] In this invention, a paraffin-based temperature sensing element is used to automatically adjust the cooling intensity according to the temperature of the outer wall of the furnace body. When the local temperature of the furnace body rises abnormally, the paraffin-based temperature sensing element at that location expands, pushing the closed plate to move, expanding the cold air channel, and increasing the cooling intensity, thus achieving precise temperature control of "blowing only where it's hot". This cooling method does not require a complex circuit control system, but relies entirely on the physical properties of the materials, resulting in high reliability and timely and effective protection of the furnace body, extending its service life.

[0043] In this invention, during normal operation of the furnace body, the cooling structure can uniformly cool the outer wall of the furnace body to ensure the stability of the overall temperature of the furnace body; when the local temperature is abnormal, it can perform targeted cooling, which not only meets the overall cooling needs of the furnace body, but also solves the problem of local overheating, thereby improving the cooling effect and the continuity of production.

[0044] In this invention, the vertical rod is raised by moving the lower connecting plate, which limits the upper connecting plate and ensures that the upper sealing plate remains closed when the raw material enters the furnace. This avoids backflow of cold air caused by misoperation or structural failure from a mechanical structure perspective, further ensuring the stability of the furnace temperature. Moreover, the purely mechanical structure is reliable in operation under high temperature and high dust conditions and has a low failure rate.

[0045] In this invention, a heating structure is installed in the feed pipe to heat the raw materials using high-temperature flue gas inside the furnace, reducing temperature fluctuations, improving the uniformity of stainless steel composition, and eliminating the need for additional baking equipment, thus reducing smelting costs. The oxygen injection structure can adjust the oxygen jet characteristics to achieve physical control of the temperature field distribution, meeting different smelting needs. The cooling structure uses paraffin temperature sensing elements to automatically adjust the cooling intensity according to the temperature of the outer wall of the furnace, achieving precise temperature control at fixed points and avoiding heat loss or insufficient cooling. The overall structure regulates temperature through physical means, improving smelting efficiency and quality. Attached Figure Description

[0046] Figure 1 A three-dimensional structural schematic diagram of a temperature control structure for a stainless steel production smelting furnace provided by the present invention;

[0047] Figure 2 A three-dimensional cross-sectional view of a temperature control structure for a stainless steel production furnace provided by the present invention.

[0048] Figure 3 A three-dimensional structural diagram of the feed pipe and exhaust stack of a temperature control structure for a stainless steel production smelting furnace provided by the present invention.

[0049] Figure 4 A three-dimensional exploded structural diagram of the flue, feed pipe and spiral guide plate I of a temperature control structure for a stainless steel production smelting furnace provided by the present invention.

[0050] Figure 5 A three-dimensional cross-sectional view of the feed pipe and exhaust stack of a temperature control structure for a stainless steel production smelting furnace provided by the present invention.

[0051] Figure 6 A three-dimensional exploded view of the upper connecting plate, lower connecting plate, and vertical rod of the temperature control structure of a stainless steel production smelting furnace provided by the present invention;

[0052] Figure 7A three-dimensional cross-sectional view of the oxygen pipe of a temperature control structure for a stainless steel production smelting furnace provided by the present invention.

[0053] Figure 8 A three-dimensional cross-sectional view of the annular wind box of a temperature control structure for a stainless steel production smelting furnace provided by the present invention.

[0054] Figure 9 A three-dimensional cross-sectional view of the channel of a temperature control structure for a stainless steel production smelting furnace provided by the present invention.

[0055] Figure 10 This is a three-dimensional exploded view of the arc-shaped block, the fixing ring, and the paraffin temperature sensing element of the temperature control structure for a stainless steel production smelting furnace provided by the present invention.

[0056] In the diagram: 1. Furnace body; 2. Furnace cover; 3. Feed pipe; 4. Feed hopper; 5. Upper sealing plate; 6. Lower sealing plate; 7. Drying chamber; 8. Upper connecting plate; 9. Lower connecting plate; 10. Pin; 11. Fixing plate; 12. Hydraulic cylinder; 13. Connecting rod; 14. Vertical rod; 15. Horizontal plate; 16. Drive plate; 17. Inclined groove; 18. Limiting groove; 19. Exhaust stack; 20. Heat exchange flue; 21. Spiral guide plate I; 22. Exhaust pipe; 23. Oxygen... 24. Air tube; 25. Threaded rod; 26. Nut block; 27. Graphite sealing ring; 28. Spiral guide plate II; 29. ​​Conical head; 30. Conical spiral guide plate; 31. Oxygen injection tube; 32. Annular air box; 33. Air cavity; 34. Annular air duct; 35. Channel; 36. Mounting plate; 37. Paraffin temperature sensing element; 38. Fixing ring; 39. Sealing plate; 40. Arc block; 41. Tension spring; 42. Air guide tube; 43. Air injection tube; 44. Exhaust port. Detailed Implementation

[0057] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0058] In one embodiment: Refer to Figure 1 and Figure 2A temperature control structure for a stainless steel smelting furnace, relating to the field of metal smelting technology, is disclosed. It mainly comprises a furnace body 1, a furnace cover 2, a feeding assembly, a heating structure, an oxygen injection structure, and a cooling structure. The furnace cover 2 is installed on the top of the furnace body 1. The feeding assembly penetrates the furnace cover 2 and is used to feed raw materials into the furnace body 1. The heating structure surrounds the feeding assembly to recover waste heat and preheat the raw materials. The oxygen injection structure penetrates the side wall of the furnace body 1 to inject oxygen into the furnace body 1 and control the oxygen injection pattern. The cooling structure is fitted onto the outside of the furnace body 1 to precisely adjust the cooling intensity according to the temperature of the outer wall of the furnace body 1. A linkage limiting structure is set on one side of the heating structure to achieve sealed protection of the feeding assembly during raw material feeding, preventing cold air backflow.

[0059] Reference Figures 2-5 The feeding assembly includes a feeding pipe 3 and a feeding hopper 4. The feeding pipe 3 is fixedly inserted through the furnace cover 2, with its lower end extending to the upper part of the furnace body 1 and its upper end extending out of the furnace cover 2. The feeding hopper 4 is fixed to the top of the feeding pipe 3 and is funnel-shaped. Its lower end is fixedly connected to the upper end of the feeding pipe 3. The stainless steel raw material to be smelted can be concentrated and introduced into the feeding pipe 3 through the feeding hopper 4, and then transported by the feeding pipe 3 to the interior of the furnace body 1 or the drying chamber 7 of the heating structure.

[0060] Reference Figures 3-5 The heating structure includes an upper sealing plate 5, a lower sealing plate 6, a drying chamber 7, a flue 19, a heat exchange flue 20, a spiral guide plate I 21, a flue gas pipe, a flue pipe 22, a fixing plate 11, a hydraulic cylinder 12, a connecting rod 13, an upper connecting plate 8, and a lower connecting plate 9. The upper sealing plate 5 and the lower sealing plate 6 inside the drying chamber 7 are both rectangular plate structures, slidingly fitted horizontally inside the feed pipe 3. The upper sealing plate 5 is located above the lower sealing plate 6, and the two are arranged parallel to each other. Two parallel sliding grooves are formed on one side wall of the feed pipe 3. One side of the upper sealing plate 5 and the lower sealing plate 6 extends through the corresponding sliding grooves to the outside of the feed pipe 3. The upper sealing plate 5 and the lower sealing plate 6 slide against the inner wall of the sliding grooves to ensure sealing performance. The drying chamber 7 is formed between the upper sealing plate 5 and the lower sealing plate 6. The drying chamber 7 is an annular cavity structure inside the feed pipe 3, used to temporarily store the raw materials to be heated, achieving preheating treatment of the raw materials.

[0061] Reference Figures 3-5An upper connecting plate 8 is fixed to one end of the upper sealing plate 5 extending to the outside of the feed pipe 3, and a lower connecting plate 9 is fixed to one end of the lower sealing plate 6 extending to the outside of the feed pipe 3. Both the upper connecting plate 8 and the lower connecting plate 9 are arranged horizontally and parallel to the side wall of the feed pipe 3. Two fixing plates 11 are provided on the outside of the feed pipe 3. The two fixing plates 11 are arranged vertically and are fixedly connected to the outer wall of the feed pipe 3, with a gap between the two fixing plates 11. A hydraulic cylinder 12 is fixedly installed on the side of the two fixing plates 11 that is far apart from each other through the frame. The output shaft of the hydraulic cylinder 12 is arranged horizontally and extends towards the feed pipe 3. A connecting rod 13 is fixedly connected to the end of the output shaft of the hydraulic cylinder 12. The connecting rod 13 is arranged horizontally and slides with the corresponding fixing plate 11 to ensure that the connecting rod 13 moves stably in the horizontal direction. The end of the upper connecting plate 8 away from the upper sealing plate 5 is fixedly connected to the connecting rod 13 of the upper hydraulic cylinder 12, and the end of the lower connecting plate 9 away from the lower sealing plate 6 is fixedly connected to the connecting rod 13 of the lower hydraulic cylinder 12. Through the extension and retraction drive of the hydraulic cylinder 12, the connecting rod 13 can be moved in the horizontal direction, thereby causing the upper sealing plate 5 or the lower sealing plate 6 to slide along the inside of the feed pipe 3, so as to realize the opening and closing of the drying chamber 7.

[0062] Reference Figures 3-5 The flue duct 19 is fixedly sleeved on the outer wall of the feed pipe 3 and located above the furnace cover 2. The flue duct 19 and the feed pipe 3 are arranged coaxially, and an annular heat exchange flue 20 is formed between the inner wall of the flue duct 19 and the outer wall of the feed pipe 3. Multiple flue gas pipes are fixed at the bottom of the flue duct 19 and are evenly distributed along the circumference of the flue duct 19. The lower end of the flue gas pipes is fixedly connected to the furnace cover 2. The furnace cover 2 has a flue gas channel inside, and the flue gas pipes are connected to the interior of the furnace body 1 through the flue gas channel to guide the high-temperature flue gas generated during the smelting process in the furnace body 1 into the heat exchange flue 20. A spiral guide plate I21 is fixed inside the heat exchange flue 20. The spiral guide plate I21 extends spirally along the axial direction of the exhaust stack 19. Its inner edge is fixedly connected to the outer wall of the feed pipe 3, and its outer edge is fixedly connected to the inner wall of the exhaust stack 19. By setting the spiral guide plate I21, the high-temperature flue gas can be forced to flow along the spiral path in the heat exchange flue 20, prolonging the residence time of the flue gas in the heat exchange flue 20 and improving the heat transfer efficiency. An exhaust pipe 22 is fixedly connected to one side of the exhaust stack 19. The exhaust pipe 22 is located at the end of the exhaust stack 19 away from the furnace cover 2, that is, at the upper part of the exhaust stack 19. The exhaust pipe 22 is used to discharge the flue gas that has completed heat exchange in the heat exchange flue 20 to the external flue gas treatment system.

[0063] Specifically, the upper hydraulic cylinder 12 is activated, and its output shaft extends, driving the corresponding connecting rod 13 to move horizontally away from the feed pipe 3. This, in turn, causes the upper sealing plate 5 to slide outward from the feed pipe 3 via the upper connecting plate 8, releasing the sealing state of the feed pipe 3. At this time, the lower hydraulic cylinder 12 remains stationary, and the lower sealing plate 6 is in the state of sealing the feed pipe 3, thus sealing the lower end of the drying chamber 7. The raw material to be smelted is fed into the drying chamber 7 through the feed hopper 4, and the raw material falls down along the feed pipe 3, completing the temporary storage of the raw material. After the raw material is fed in, the upper hydraulic cylinder 12 is activated to retract in the reverse direction, driving the upper sealing plate 5 to reset and reseal the upper end of the feed pipe 3, preventing heat loss and the entry of outside air into the drying chamber 7.

[0064] The high-temperature flue gas generated during smelting inside the furnace body 1 enters the flue gas pipe through the flue gas passage of the furnace cover 2, and is then guided into the heat exchange flue 20. Within the heat exchange flue 20, the high-temperature flue gas flows along the spiral path of the spiral guide plate I 21. During this flow, the heat of the flue gas is conducted through the wall of the feed pipe 3 to the drying chamber 7, heating the raw materials within the drying chamber 7 and achieving waste heat recovery and raw material preheating. During the heating process, the temperature of the flue gas gradually decreases, and it is eventually discharged through the exhaust pipe 22.

[0065] Once the raw material is heated to the preset temperature, the lower hydraulic cylinder 12 is activated. The output shaft of the hydraulic cylinder 12 extends, driving the corresponding connecting rod 13 to move horizontally away from the feed pipe 3. This, in turn, drives the lower sealing plate 6 to slide outwards from the feed pipe 3 via the lower connecting plate 9, releasing the sealing state of the feed pipe 3. At this time, the upper hydraulic cylinder 12 remains stationary, and the upper sealing plate 5 is in the state of sealing the feed pipe 3, preventing cold air from flowing back into the furnace body 1 through the upper end of the feed pipe 3. The heated raw material in the drying chamber 7 falls into the furnace body 1 along the feed pipe 3, completing the feeding of the raw material. After the raw material feeding is completed, the lower hydraulic cylinder 12 is activated to retract in the opposite direction, driving the lower sealing plate 6 to reset and re-seal the lower end of the feed pipe 3, awaiting the next feeding and heating of raw material.

[0066] Reference Figure 2 and Figure 7 The oxygen injection structure includes an oxygen pipe 23, an oxygen injection pipe 30, a threaded rod 24, a nut block 25, a spiral guide plate II, a conical head 28, a conical spiral guide plate 29, and a graphite sealing ring 26, which are used to inject oxygen into the furnace body 1 and adjust the oxygen injection pattern according to the temperature control requirements.

[0067] Reference Figure 2 and Figure 7Oxygen pipe 23 is connected to oxygen injection pipe 30. Oxygen pipe 23 is fixedly inserted through the side wall of furnace body 1 at an inclined angle of 20°. One end of oxygen pipe 23 extends into the interior of furnace body 1, and the other end is located on the outside of furnace body 1. Oxygen injection pipe 30 is fixedly connected to the top of oxygen pipe 23. One end of oxygen injection pipe 30 is vertically connected to oxygen pipe 23, and the other end is connected to an external oxygen source. External oxygen is introduced into oxygen pipe 23 through oxygen injection pipe 30, and then transported to the interior of furnace body 1 by oxygen pipe 23.

[0068] Reference Figure 2 and Figure 7 One end of the oxygen pipe 23 located on the outside of the furnace body 1 is fixed with a nut block 25. The nut block 25 is coaxially arranged with the oxygen pipe 23, and the inner wall of the nut block 25 is provided with internal threads. A threaded rod 24 is threaded through the nut block 25. One end of the threaded rod 24 extends into the interior of the oxygen pipe 23, and the other end is located on the outside of the nut block 25 and is fixed with a handwheel for easy rotation by the operator. The end of the threaded rod 24 extending into the interior of the oxygen pipe 23 is rotatably connected to a spiral guide plate II via a bearing. The spiral guide plate II 27 is arranged along the axial direction of the oxygen pipe 23 and slides against the inner wall of the oxygen pipe 23. The spiral guide plate II 27 can slide axially within the oxygen pipe 23 and can rotate with the rotation of the threaded rod 24. However, due to the bearing, the rotation of the threaded rod 24 does not directly drive the spiral guide plate II 27 to rotate; it only pushes the spiral guide plate II 27 to move axially through the threaded transmission.

[0069] Reference Figure 2 and Figure 7 A conical head 28 is fixed to one end of the oxygen pipe 23 extending into the furnace body 1. The tip of the conical head 28 faces the inside of the furnace body 1, and the inside of the conical head 28 is provided with an injection channel communicating with the oxygen pipe 23. A conical spiral guide plate 29 is fixed to one end of the spiral guide plate II 27 near the conical head 28. The shape of the conical spiral guide plate 29 is adapted to the inner wall of the conical head 28. When the spiral guide plate II 27 moves toward the conical head 28, the conical spiral guide plate 29 can fit against the inner wall of the conical head 28.

[0070] Reference Figure 2 and Figure 7 A graphite sealing ring 26 is fixed to the inner wall of the oxygen tube 23 on the side away from the conical head 28. The graphite sealing ring 26 has an annular structure and is arranged coaxially with the oxygen tube 23. One end of the threaded rod 24 passes through the central hole of the graphite sealing ring 26. The inner wall of the central hole of the graphite sealing ring 26 is tightly fitted with the outer wall of the threaded rod 24. The graphite sealing ring 26 can increase the sealing between the threaded rod 24 and the oxygen tube 23, and prevent oxygen from leaking at the gap between the threaded rod 24 and the oxygen tube 23.

[0071] Specifically, in the oxygen injection mode adjustment process, the operator rotates the threaded rod 24 via the handwheel, causing the threaded rod 24 to move along the nut block 25 into the oxygen pipe 23. This pushes the spiral guide plate II 27 and the conical spiral guide plate 29 towards the conical head 28 until the conical spiral guide plate 29 is in contact with the inner wall of the conical head 28. At this time, external oxygen enters the oxygen pipe 23 through the oxygen injection pipe 30. When it flows through the spiral guide plate II 27, it forms a rotating airflow under the guidance of the spiral structure. Further guided by the conical spiral guide plate 29, the oxygen enters the furnace body 1 in a spiral rotation form through the injection channel of the conical head 28. The rotating oxygen generates a strong swirling flow, and using centrifugal force, it forms an umbrella-shaped diffused flame after being ejected. The flame covers a large area and reacts gently with the materials in the furnace, making it suitable for heat preservation or temperature uniformity adjustment of the furnace body 1.

[0072] Rapid heating mode: The operator rotates the threaded rod 24 in the opposite direction, causing it to move along the nut block 25 towards the outside of the oxygen pipe 23. This moves the spiral guide plate II 27 and the conical spiral guide plate 29 away from the conical head 28, creating a large gap between them. At this time, external oxygen enters the oxygen pipe 23 through the oxygen injection pipe 30, passes directly through the gap between the spiral guide plate II 27 and the conical head 28, and enters the furnace body 1 through the injection channel 34 of the conical head 28. The airflow is approximately a direct jet, with strong penetrating power. The reaction with the materials inside the furnace is concentrated in the deep molten pool inside the furnace body 1, which can rapidly increase the furnace temperature. This mode is suitable for smelting stages that require rapid heating.

[0073] By rotating the threaded rod 24 to change the relative position between the spiral guide plate II 27 and the conical spiral guide plate 29 and the conical head 28, the mechanical adjustment of the oxygen injection mode is realized. Without relying on electronic components, the oxygen injection mode can be switched according to different temperature control requirements, improving the flexibility and reliability of temperature control.

[0074] Reference Figure 2 and Figures 8-10 The cooling structure includes an annular air box 31, an annular air duct 33, a channel 34, an air cavity 32, a mounting plate 35, a paraffin temperature sensing element 36, a fixing ring 37, a sealing plate 38, a tension spring 40, an arc-shaped block 39, an exhaust hole 43, an air guide pipe 41, and an air injection pipe 42, which are used to precisely adjust the cooling intensity according to the temperature of the outer wall of the furnace body 1 to achieve point cooling.

[0075] Reference Figure 2 and Figure 8An annular bellows 31 is fixedly fitted onto the outer wall of the furnace body 1, and is coaxially arranged with the furnace body 1. The inner wall of the annular bellows 31 is tightly fitted against the outer wall of the furnace body 1 to ensure efficient heat transfer. An annular duct 33 is fitted onto the outer wall of the annular bellows 31, and is coaxially arranged with the annular bellows 31, with a gap between them. Multiple channels 34 are evenly distributed along the circumference of the annular duct 33 and the annular bellows 31. The channels 34 are arranged radially, with their inner ends fixedly connected to the annular bellows 31 and their outer ends fixedly connected to the annular duct 33. The channels 34 are used to introduce cold air from the annular duct 33 into the annular bellows 31.

[0076] Reference Figure 8 The annular wind box 31 is divided into multiple air chambers 32 along the axial direction. Each air chamber 32 has a fan-shaped cavity structure and is connected to a corresponding channel 34. After entering the air chamber 32 through the channel 34, the cold air directly contacts the outer wall of the furnace body 1, thereby cooling the furnace body 1. Multiple exhaust holes 43 are provided on the top and bottom inner walls of the air chamber 32. The exhaust holes 43 are evenly distributed along the circumference of the air chamber 32. Adjacent air chambers 32 are connected to each other through the exhaust holes 43, allowing the cooled hot air to flow and be discharged within the air chamber 32, thus improving the cooling effect.

[0077] Reference Figures 8-10 Each channel 34 is fixed with a mounting plate 35, which is arranged radially along the channel 34. The mounting plate 35 has through holes to avoid the temperature probe of the paraffin heat-sensing element 36 (the paraffin heat-sensing element 36 consists of a fixed cylinder, a temperature probe, a piston rod, and heat-sensing paraffin; when the temperature probe conducts heat to the fixed cylinder to heat the heat-sensing paraffin, the paraffin expands and pushes the piston rod). The paraffin heat-sensing element 36 is fixed to the side of the mounting plate 35 away from the furnace body 1 by bolts. One end of the temperature probe of the paraffin heat-sensing element 36 passes through the through hole of the mounting plate 35, extends into the air cavity 32, and contacts the outer wall of the furnace body 1 to conduct heat from the outer wall of the furnace body 1, thus heating the heat-sensing paraffin inside the paraffin heat-sensing element 36. A fixing ring 37 is fixed in the channel 34 on the side of the mounting plate 35 near the annular air duct 33. The fixing ring 37 is coaxially arranged with the channel 34, and its inner wall is annular. One end of the piston rod of the paraffin temperature sensing element 36 passes through the central hole of the retaining ring 37 and extends to the side near the annular air duct 33. A sealing disc 38 is fixed to the end of the piston rod. The diameter of the sealing disc 38 is slightly larger than the inner diameter of the retaining ring 37, and it is used to close or open the central hole of the retaining ring 37.

[0078] Reference Figure 10A tension spring 40 is provided between the closed disc 38 and the mounting plate 35. The tension spring 40 is sleeved on the outer wall of the piston rod. One end of the tension spring 40 is fixed to a spring seat on the mounting plate 35, and the other end is fixed to a spring seat on the closed disc 38. The parameters of the tension spring 40 are as follows: wire diameter 0.8-1.5mm, free length 30-50mm, stiffness 2-5N / mm, working limit elongation 10-20mm, and initial preload 10-20N.

[0079] Reference Figure 10 Multiple arc-shaped blocks 39 are fixed on the side of the fixing ring 37 away from the paraffin temperature sensing element 36. The arc-shaped blocks 39 are evenly distributed along the circumference of the fixing ring 37, and the number is 3-4. A ventilation gap is formed between the multiple arc-shaped blocks 39. The width of the ventilation gap is 1-3mm. When the closed plate 38 abuts against the arc-shaped blocks 39, the cold air in the annular air duct 33 can enter the channel 34 through the ventilation gap.

[0080] Reference Figure 2 Adjacent annular air ducts 33 are fixedly connected by air guide pipes 41. The air guide pipes 41 are arranged along the axial direction of the furnace body 1, so that multiple annular air ducts 33 form a connected whole, ensuring that the cold air can be evenly distributed. One side of one of the annular air ducts 33 is fixedly connected to an air injection pipe 42, which is connected to an external induced draft fan. After the induced draft fan is started, the cold air from the outside is injected into the annular air duct 33 through the air injection pipe 42, and then enters the air chamber 32 of the annular air box 31 through the channel 34 to cool the outer wall of the furnace body 1.

[0081] Normal temperature state during cooling operation: When the furnace body 1 is operating normally and the outer wall temperature is within the preset range, the temperature-sensing paraffin in the paraffin temperature-sensing element 36 does not expand significantly. The piston rod remains stationary under the tension of the tension spring 40. The sealing plate 38 abuts against the arc-shaped block 39, and a ventilation gap is formed between the sealing plate 38 and the fixing ring 37 through the arc-shaped block 39. Under the action of the induced draft fan, the outside cold air enters the annular air duct 33 through the air injection pipe 42, then enters the channel 34 through the ventilation gap, and then flows into the air cavity 32, contacting the outer wall of the furnace body 1 and carrying away the heat of the furnace body 1. The hot air is discharged through the exhaust port 43 of the air cavity 32, achieving normal cooling of the furnace body 1. At this time, the cooling intensity of each air cavity 32 is consistent.

[0082] Localized overheating: When the lining of the furnace body 1 becomes thinner in a localized area, causing an abnormal increase in the temperature of the outer wall of the corresponding area, the temperature sensor of the paraffin heat-sensing element 36 in the air cavity 32 of that area senses the temperature increase and conducts heat to the heat-sensing paraffin. The heat-sensing paraffin expands due to heat, generating axial thrust, which pushes the piston rod to move away from the mounting plate 35, overcoming the tension of the tension spring 40, and moving the sealing plate 38 away from the fixing ring 37. The gap between the sealing plate 38 and the fixing ring 37 widens, increasing the flow of cold air entering the air cavity 32 through the channel 34, enhancing the cooling intensity, and achieving targeted enhanced cooling of the localized overheated area. When the temperature of the outer wall of the furnace body 1 in that area drops to the preset range, the heat-sensing paraffin contracts, the piston rod resets under the tension of the tension spring 40, the sealing plate 38 re-abuts the arc-shaped block 39, and the cooling intensity returns to normal.

[0083] By using the physical expansion and contraction of the paraffin temperature sensing element 36, combined with the elastic reset of the tension spring 40, the cooling intensity is automatically adjusted. Without any circuit control, it can achieve precise cooling of "where it is hot, that's where it is" based on the temperature distribution of the outer wall of the furnace body 1, improving cooling efficiency while avoiding energy waste.

[0084] In another embodiment: Refer to Figure 5 and Figure 6 The structure of this embodiment is basically the same as that of the previous embodiment, except that it also includes a linkage limiting structure, which includes a vertical rod 14, a horizontal plate 15, a drive plate 16, an inclined groove 17 and a pin 10, used to restrict the movement of the upper sealing plate 5 during the raw material feeding stage, so as to ensure that the upper sealing plate 5 always remains in a closed state.

[0085] Reference Figure 5 and Figure 6 The vertical rod 14 slides through two fixed plates 11, each of which has a vertical guide hole. The vertical rod 14 passes through the two guide holes and slides against the inner wall of the guide holes. A horizontal plate 15 is fixed to the bottom of the vertical rod 14 and is located above the lower connecting plate 9. The length direction of the horizontal plate 15 is the same as that of the lower connecting plate 9. Drive plates 16 are fixed to both sides of the bottom of the horizontal plate 15. The lower connecting plate 9 is located between the two drive plates 16, and the side walls of the lower connecting plate 9 slide against the inner wall of the drive plates 16. An inclined groove 17 is formed on the side of the two drive plates 16 that is close to each other. The inclined groove 17 extends in an inclined direction and the two inclined grooves 17 are symmetrically arranged. The upper end of the inclined groove 17 is inclined away from the lower connecting plate 9, and the lower end is inclined towards the lower connecting plate 9. A pin 10 is slidably disposed between the two inclined grooves 17. The pin 10 is arranged in the horizontal direction and is fixedly inserted through the lower connecting plate 9. The two ends of the pin 10 extend into the corresponding inclined grooves 17 and slide against the inner wall of the inclined grooves 17.

[0086] A limiting groove 18 is provided at the end of the upper connecting plate 8 away from the upper sealing plate 5. The upper end of the vertical rod 14 can be inserted into the limiting groove 18 to limit and fix the upper connecting plate 8. When the lower hydraulic cylinder 12 drives the lower connecting plate 9 to move away from the feed pipe 3, the lower connecting plate 9 drives the pin 10 to move synchronously. The pin 10 slides in the inclined groove 17. Due to the inclination angle of the inclined groove 17, the pin 10 generates a lateral thrust on the inner wall of the inclined groove 17 during its movement, pushing the drive plate 16 to move upward, thereby driving the horizontal plate 15 and the vertical rod 14 to rise in the vertical direction. After the vertical rod 14 rises, its upper end is inserted into the limiting groove 18 of the upper connecting plate 8, which limits the upper connecting plate 8 and prevents the upper sealing plate 5 from sliding outward. This ensures that the upper sealing plate 5 always keeps the upper end of the feed pipe 3 closed during the raw material feeding process, preventing cold air from entering the furnace body 1 through the feed pipe 3. After the raw materials are fed in, the lower hydraulic cylinder 12 retracts in the reverse direction, causing the lower connecting plate 9 to reset. The pin 10 slides in the reverse direction in the inclined groove 17. The drive plate 16 and the horizontal plate 15 descend under their own gravity, and the vertical rod 14 moves down accordingly. Its upper end disengages from the limiting groove 18, releasing the limiting on the upper connecting plate 8. The upper sealing plate 5 can then move again to feed the raw materials for the next time.

[0087] A method for using a temperature control structure for a stainless steel smelting furnace includes the following steps:

[0088] S1. Raw Material Feeding Stage: The upper hydraulic cylinder 12 is activated, extending its output shaft and driving the corresponding connecting rod 13 to move horizontally away from the feed pipe 3. This, in turn, causes the upper sealing plate 5 to slide outwards from the feed pipe 3 via the upper connecting plate 8, releasing the sealing state of the feed pipe 3. At this time, the lower hydraulic cylinder 12 remains stationary, and the lower sealing plate 6 is in the state of sealing the feed pipe 3, thus sealing the lower end of the drying chamber 7. The raw material to be smelted is fed into the drying chamber 7 through the feed hopper 4, falling along the feed pipe 3 to complete the temporary storage of the raw material. After the raw material feeding is completed, the upper hydraulic cylinder 12 is activated to retract in the reverse direction, causing the upper sealing plate 5 to reset and reseal the upper end of the feed pipe 3, preventing heat loss and the entry of outside air from the drying chamber 7.

[0089] S2. Raw Material Heating Stage: The high-temperature flue gas generated during smelting in the furnace body 1 enters the flue gas pipe through the flue gas passage of the furnace cover 2, and is then guided into the heat exchange flue 20. The high-temperature flue gas flows along the spiral path of the spiral guide plate I 21 within the heat exchange flue 20. During this flow, the heat of the flue gas is conducted through the pipe wall of the feed pipe 3 to the drying chamber 7, heating the raw materials within the drying chamber 7, thus achieving waste heat recovery and raw material preheating. During the heating process, the temperature of the flue gas gradually decreases and is eventually discharged through the exhaust pipe 22.

[0090] S3. Raw Material Feeding Stage: After the raw material is heated to the preset temperature, the lower hydraulic cylinder 12 is activated. The output shaft of the hydraulic cylinder 12 extends, driving the corresponding connecting rod 13 to move horizontally away from the feed pipe 3. This, in turn, drives the lower sealing plate 6 to slide outward through the lower connecting plate 9, releasing the sealing state of the feed pipe 3. At this time, the upper hydraulic cylinder 12 remains stationary, and the upper sealing plate 5 is in the state of sealing the feed pipe 3, preventing cold air from flowing back into the furnace body 1 through the upper end of the feed pipe 3. The heated raw material in the drying chamber 7 falls into the furnace body 1 along the feed pipe 3, completing the raw material feeding. After the raw material feeding is completed, the lower hydraulic cylinder 12 is activated to retract in the opposite direction, driving the lower sealing plate 6 to reset and re-seal the lower end of the feed pipe 3, waiting for the next raw material feeding and heating. Waste heat is recovered through a purely mechanical structure, which raises the temperature of the material entering the furnace, physically reducing the peak value of temperature fluctuations.

[0091] S4. Oxygen Injection Mode Adjustment Process: In the heat preservation or temperature homogenization mode, the operator rotates the threaded rod 24 via the handwheel, causing it to move along the nut block 25 into the oxygen pipe 23. This pushes the spiral guide plate II 27 and the conical spiral guide plate 29 towards the conical head 28 until the conical spiral guide plate 29 is against the inner wall of the conical head 28. At this time, external oxygen enters the oxygen pipe 23 through the oxygen injection pipe 30. As it flows through the spiral guide plate II 27, it forms a rotating airflow under the guidance of the spiral structure. Further guided by the conical spiral guide plate 29, the oxygen enters the furnace body 1 through the injection channel of the conical head 28 in a spiral rotational form. The rotating oxygen generates a strong swirling flow, and using centrifugal force, it forms an umbrella-shaped diffused flame after being ejected. The flame covers a large area and reacts gently with the materials inside the furnace, making it suitable for heat preservation or temperature homogenization adjustment of the furnace body 1.

[0092] S5. Rapid Heating Mode: The operator rotates the threaded rod 24 in the opposite direction, causing it to move along the nut block 25 towards the outside of the oxygen pipe 23. This moves the spiral guide plate II 27 and the conical spiral guide plate 29 away from the conical head 28, creating a large gap between them. At this time, external oxygen enters the oxygen pipe 23 through the oxygen injection pipe 30, passes directly through the gap between the spiral guide plate II 27 and the conical head 28, and enters the furnace body 1 through the injection channel 34 of the conical head 28. The airflow is approximately a direct jet, with strong penetrating power. The reaction with the materials in the furnace is concentrated in the deep molten pool inside the furnace body 1, which can rapidly increase the furnace temperature. This mode is suitable for smelting stages that require rapid heating. By rotating the threaded rod 24, the relative positions of the spiral guide plate II 27 and the conical spiral guide plate 29 with the conical head 28 are changed, realizing the mechanical adjustment of the oxygen injection mode. This allows for switching of the oxygen injection mode according to different temperature control requirements without relying on electronic components, improving the flexibility and reliability of temperature control.

[0093] S6. Normal Temperature State During Cooling Operation: When the furnace body 1 is operating normally and the outer wall temperature is within the preset range, the temperature-sensing paraffin in the paraffin temperature-sensing element 36 does not expand significantly. The piston rod remains stationary under the tension of the tension spring 40. The sealing plate 38 abuts against the arc-shaped block 39, and a ventilation gap is formed between the sealing plate 38 and the fixed ring 37 through the arc-shaped block 39. Under the action of the induced draft fan, the outside cold air enters the annular air duct 33 through the air injection pipe 42, then enters the channel 34 through the ventilation gap, and then flows into the air cavity 32, contacting the outer wall of the furnace body 1 and carrying away the heat of the furnace body 1. The hot air is discharged through the exhaust port 43 of the air cavity 32, achieving normal cooling of the furnace body 1. At this time, the cooling intensity of each air cavity 32 is consistent.

[0094] S7. Localized Overheating: When the lining of the furnace body 1 becomes thinner in a localized area, causing an abnormal increase in the temperature of the outer wall of the corresponding area, the temperature sensor of the paraffin heat-sensing element 36 in the air cavity 32 of that area senses the temperature increase and conducts heat to the heat-sensing paraffin. The heat-sensing paraffin expands due to the heat, generating axial thrust, which pushes the piston rod to move away from the mounting plate 35, overcoming the tension of the tension spring 40, and causing the sealing plate 38 to move away from the fixing ring 37. The gap between the sealing plate 38 and the fixing ring 37 widens, increasing the flow rate of cold air entering the air cavity 32 through the channel 34, enhancing the cooling intensity, and achieving targeted enhanced cooling of the localized overheated area. When the temperature of the outer wall of the furnace body 1 in this area drops to the preset range, the temperature-sensing paraffin contracts, the piston rod resets under the tension of the tension spring 40, the closed plate 38 re-abuts the arc-shaped block 39, and the cooling intensity returns to normal. Through the physical expansion and contraction of the paraffin temperature-sensing element 36, combined with the elastic reset of the tension spring 40, the cooling intensity is automatically adjusted. Without any circuit control, it can achieve precise cooling of "where it is hot, it blows" according to the temperature distribution of the outer wall of the furnace body 1, improving cooling efficiency while avoiding energy waste.

[0095] However, as is well known to those skilled in the art, the working principle and wiring method of the hydraulic cylinder 12 are commonplace and are all conventional methods or common knowledge. They will not be elaborated here. Those skilled in the art can make any selections according to their needs or convenience.

[0096] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0097] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A temperature control structure for a smelting furnace for stainless steel production, comprising a furnace body (1), wherein a furnace cover (2) is provided on the top of the furnace body (1); Its features are: Feed pipe (3), the feed pipe (3) is fixedly inserted through the furnace cover (2), and a feed hopper (4) is fixed at the top of the feed pipe (3). The feed pipe (3) and the feed hopper (4) are used together to feed raw materials into the furnace body (1). The heating structure is provided on the outer wall of the feed pipe (3) and includes a flue (19). The flue (19) is fixed on the outer wall of the feed pipe (3) and located above the furnace cover (2). A heat exchange flue (20) is formed between the flue (19) and the feed pipe (3) to introduce the high-temperature flue gas in the furnace body (1) and heat the raw material in the feed pipe (3). The oxygen injection structure includes an oxygen pipe (23) that is fixedly inserted through the furnace body (1) and is used to inject oxygen into the furnace body (1) to physically regulate the temperature. The cooling structure includes an annular air duct (33) and an annular air box (31). The annular air box (31) is fixedly sleeved on the outer wall of the furnace body (1), and the annular air duct (33) is sleeved on the outer wall of the annular air box (31) to adjust the cooling intensity according to the temperature of the outer wall of the furnace body (1).

2. The temperature control structure for a stainless steel smelting furnace according to claim 1, characterized in that, The heating structure also includes an upper sealing plate (5) and a lower sealing plate (6), which are slidably disposed in the feed pipe (3). A drying chamber (7) is formed between the upper sealing plate (5) and the lower sealing plate (6) to accommodate the raw material to be heated. The bottom of the exhaust pipe (19) is fixed with multiple flue gas pipes that communicate with the furnace cover (2). A spiral guide plate I (21) is fixed in the heat exchange flue (20) to extend the residence time of high-temperature flue gas and heat the raw material in the drying chamber (7) through heat conduction. An exhaust pipe (22) is fixedly connected to one side of the exhaust pipe (19) to discharge the flue gas.

3. The temperature control structure for a stainless steel smelting furnace according to claim 2, characterized in that, The heating structure also includes two fixed plates (11), a hydraulic cylinder (12), and a connecting rod (13). The two fixed plates (11) are arranged vertically and fixed on one side of the feed pipe (3). The hydraulic cylinder (12) is fixed on the fixed plate (11) by the frame. The connecting rod (13) is connected to the output shaft of the hydraulic cylinder (12) and can slide through the fixed plate (11). An upper connecting plate (8) and a lower connecting plate (9) are fixed on one side of the upper closing plate (5) and the lower closing plate (6), respectively. The upper connecting plate (8) and the lower connecting plate (9) are fixedly connected to the corresponding connecting rod (13). The hydraulic cylinder (12) drives the upper sealing plate (5) or the lower sealing plate (6) to move, so as to alternately open the feed pipe (3) to prevent cold air from flowing back into the furnace body (1).

4. The temperature control structure for a stainless steel smelting furnace according to claim 3, characterized in that, The oxygen injection structure also includes a nut block (25), a threaded rod (24), a spiral guide plate II (27), and a conical head (28). The nut block (25) is fixed at one end of the oxygen pipe (23) away from the furnace body (1). The threaded rod (24) is threaded through the nut block (25) and extends into the oxygen pipe (23). The spiral guide plate II (27) is rotatably connected to the end of the threaded rod (24) and slidably disposed in the oxygen pipe (23). The conical head (28) is fixed to one end of the oxygen pipe (23) extending into the furnace body (1); One end of the spiral guide plate II (27) is fixed with a conical spiral guide plate (29), which is in conjunction with the conical head (28).

5. The temperature control structure for a stainless steel smelting furnace according to claim 4, characterized in that, The cooling structure also includes multiple channels (34), the two ends of which are fixedly connected to an annular air duct (33) and an annular air box (31), respectively; The annular wind box (31) is provided with multiple air chambers (32), and the channel (34) is connected to the air chambers (32) to introduce cold air from the annular air duct (33) into the air chambers (32) to directly cool the outer wall of the furnace body (1).

6. The temperature control structure for a stainless steel smelting furnace according to claim 5, characterized in that, The cooling structure also includes multiple mounting plates (35), paraffin temperature sensing elements (36), a retaining ring (37), and a sealing plate (38); The mounting plate (35) is fixed in the channel (34), the paraffin heat-sensing element (36) is fixed on the mounting plate (35), and the heat-sensing probe of the paraffin heat-sensing element (36) penetrates the mounting plate (35) and extends into the air cavity (32), and contacts the outer wall of the furnace body (1). The fixing ring (37) is fixed inside the channel (34), and the piston rod of the paraffin temperature sensing element (36) passes through the fixing ring (37) and is fixedly connected to the closed plate (38).

7. The temperature control structure for a stainless steel smelting furnace according to claim 6, characterized in that, The fixing ring (37) has multiple arc-shaped blocks (39) fixed on the side away from the paraffin temperature sensing element (36), and ventilation gaps are formed between the multiple arc-shaped blocks (39); When the closed plate (38) comes into contact with the arc-shaped block (39), the cooling air enters the air cavity (32) through the ventilation gap, so that the outer wall of the furnace body (1) is uniformly cooled by air.

8. The temperature control structure for a stainless steel smelting furnace according to claim 7, characterized in that, The top and bottom inner walls of the air cavity (32) are provided with multiple exhaust holes (43) for air circulation to remove heat; It also includes multiple air ducts (41) and air injection pipes (42). Adjacent annular air ducts (33) are connected by air ducts (41). The air injection pipes (42) are fixedly connected to an annular air duct (33) and connected to an external exhaust fan for introducing cold air.

9. The temperature control structure for a stainless steel smelting furnace according to claim 8, characterized in that, A graphite sealing ring (26) is fixed to the inner wall of the oxygen tube (23) away from the conical head (28). The threaded rod (24) passes through the graphite sealing ring (26) and seals the gap between the threaded rod (24) and the oxygen tube (23) through the graphite sealing ring (26) to prevent oxygen leakage.

10. The temperature control structure for a stainless steel smelting furnace according to claim 9, characterized in that, It also includes a vertical bar (14), a horizontal plate (15), and a drive plate (16); The same vertical rod (14) is slidably passed through the two fixed plates (11), and a horizontal plate (15) is fixed to the bottom of the vertical rod (14), and the horizontal plate (15) is located above the lower connecting plate (9). Both sides of the bottom of the horizontal plate (15) are fixed with drive plates (16), and the lower connecting plate (9) is located between the two drive plates (16). The two drive plates (16) are provided with inclined grooves (17) on the side that is close to each other. The pin (10) is fixed through the lower connecting plate (9) and slides in the inclined groove (17); The upper connecting plate (8) is provided with a limiting groove (18), and the vertical rod (14) is inserted into the limiting groove (18); When the lower connecting plate (9) moves, the pin (10) slides along the inclined groove (17) to drive the vertical rod (14) to rise and insert into the limiting groove (18) to lock the upper connecting plate (8) and prevent the upper closing plate (5) from opening.

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