A high temperature rotary heating furnace

Abstract

This invention discloses a high-temperature rotary heating furnace, comprising a frame and a furnace body. The furnace body includes a furnace shell, a furnace chamber, and inlet / outlet doors. The furnace shell is mounted on the frame, the furnace chamber is located inside the furnace shell, and the inlet / outlet doors are located at one end of the furnace shell and connected to an opening / closing mechanism. A heating assembly is mounted on the top of the furnace shell. The frame also includes a turntable assembly and a rotary drive mechanism for rotating the turntable assembly. The turntable assembly passes through the furnace shell and is located inside the furnace chamber. A sealing mechanism is provided between the turntable assembly and the furnace chamber. This invention has the advantage of improving the heating uniformity and reaction effect of various parts of the workpiece.

Description

Technical Field

[0001] This invention relates to the field of metal heat treatment technology, and more specifically to a high-temperature rotary heating furnace. Background Technology

[0002] In modern industry, high-temperature alloys such as stainless steel and titanium alloys are widely used due to their superior corrosion resistance, high-temperature resistance, and mechanical properties. These materials possess good plasticity and weldability, making them suitable for various complex manufacturing processes. They are commonly used to manufacture equipment components that withstand high temperatures, high pressures, and corrosive environments, such as aerospace components, high-temperature furnaces, and chemical equipment. In hot forging and warm forging processes, the high-temperature alloy blank must first be heated to improve the metal's plasticity, reduce deformation resistance, facilitate flow and forming, and obtain a good post-forging microstructure. Therefore, pre-forging heating is a crucial step in the entire forging process, directly impacting forging productivity, ensuring forging quality, and saving energy consumption.

[0003] The performance (such as the rate of heating and cooling, the ability to maintain the required temperature, and the working conditions of the workers) and service life of heating furnaces not only affect the implementation of heating processes and product quality, but also the production costs of enterprises. Therefore, there are strict technical requirements for the use of heating furnaces: 1. During heat treatment, the allowable temperature difference across the cross-section of the metal workpiece should be relatively small, requiring uniform heating or a temperature distribution that meets the requirements; 2. When performing metal heat treatment, it is necessary to ensure that the metal undergoes minimal decarburization and oxidation.

[0004] Currently, heat treatment furnaces on the market use electric heating tubes or gas for heating. This type of heat treatment furnace has the disadvantage that the temperature is high in the area near the heating element and low in the area far from the heating element. In order to make the temperature in the furnace uniform, a fan is often used to circulate the air in the furnace to achieve the purpose of temperature uniformity. However, the operating temperature of the fan is limited, and it cannot meet the heating requirement of 1250℃ for high-temperature alloys, nor can it meet the pre-forging heating requirements under a neutral atmosphere. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a high-temperature rotary heating furnace that improves the heating uniformity and reaction effect of various parts of the workpiece.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A high-temperature rotary heating furnace includes a frame and a furnace body. The furnace body includes a furnace shell, a furnace chamber, and inlet / outlet doors. The furnace shell is mounted on the frame, the furnace chamber is located inside the furnace shell, and the inlet / outlet doors are located at one end of the furnace shell and connected to an opening / closing mechanism. A heating assembly is provided on the top of the furnace shell. The frame also includes a turntable assembly and a rotary drive mechanism for driving the turntable assembly to rotate. The turntable assembly passes through the furnace shell and is located inside the furnace chamber. A sealing mechanism is provided between the turntable assembly and the furnace chamber.

[0008] As a further improvement to the above technical solution:

[0009] The turntable assembly includes a firing plate, a mounting base, an insulation layer, and a turntable. The turntable is connected to a rotation drive mechanism, the insulation layer is disposed on the turntable, and the firing plate is mounted on the insulation layer via the mounting base.

[0010] The mounting base includes a chuck and a clamping tube. The chuck is embedded in the insulation layer and has a chuck groove. The clamping tube is located in the middle of the chuck groove. The bottom of the heating plate has a clamping block and a positioning hole in the middle. The clamping block is clamped in the chuck groove and the positioning hole is sleeved on the outside of the clamping tube.

[0011] The bottom of the firing pan is provided with multiple support columns, which are arranged at intervals along the circumference of the firing pan. The support columns are supported in the insulation layer and are provided with pads at the bottom.

[0012] The firing tray is provided with multiple loading areas, which are arranged at intervals along the circumference of the firing tray. The loading areas are provided with anti-slip patterns and air holes.

[0013] The furnace shell has a maintenance door at one end, and the furnace chamber has a feeding channel at one end and a maintenance channel at the other end. The feeding channel is located between the feeding / discharging door and the firing plate. The inner side of the furnace chamber has a spliced ​​arc surface and a square surface. The arc surface is located near the feeding channel. The firing plate is connected to the feeding channel through the arc surface. The periphery of the firing plate has a retaining flange of the same height as the feeding channel. The square surface is located near the maintenance channel. An anti-jamming structure is also provided between the furnace chamber and the firing plate. The anti-jamming structure includes a square receiving groove and a transition slope. The square receiving groove is located inside the square surface. The height of the square receiving groove is lower than that of the firing plate, and the width is greater than that of the feeding channel. The feeding channel and the square receiving groove are located on opposite sides of the firing plate. The transition slope is located between the furnace chamber, the firing plate, and the square receiving groove.

[0014] The sealing mechanism includes an annular oil seal cavity, a cooling water tank, a fixed oil seal blade, and a rotating oil seal blade. The annular oil seal cavity is located inside the cooling water tank. The fixed oil seal blade and the rotating oil seal blade are both located inside the annular oil seal cavity. The fixed oil seal blade is located at the bottom of the furnace shell, and the rotating oil seal blade is located at the bottom of the turntable assembly. The bottom of the cooling water tank is connected to a water inlet and a water outlet, and the top is connected to a water outlet. The cooling water tank is also equipped with a water level gauge, and the annular oil seal cavity is equipped with a filler port and an oil level gauge.

[0015] The top of the furnace shell is equipped with a temperature measuring component, which includes a temperature control thermocouple and a calibration thermocouple. The temperature control thermocouple and the calibration thermocouple are parallel and vertically arranged. The temperature control thermocouple is electrically connected to the control module, and the control module is electrically connected to the heating component.

[0016] The frame is equipped with a photoelectric sensor, the bottom of the turntable assembly is equipped with a reflector, the reflector is equipped with a zero position mark, and the photoelectric sensor faces the reflector.

[0017] A storage platform is provided on the outside of the inlet / outlet furnace door, and a detection mechanism is provided on the furnace shell. The detection mechanism is used to detect the movement status of the inlet / outlet furnace door and the storage status of the storage platform.

[0018] Compared with the prior art, the advantages of the present invention are as follows:

[0019] The high-temperature rotary heating furnace disclosed in this invention features a rotating turntable assembly that rotates the material, improving the uniformity of material heating and ensuring full contact with process gases and inert gases. This enhances temperature uniformity, reduces material oxidation, and increases yield. Simultaneously, the rotation of the turntable assembly promotes gas circulation within the furnace, resulting in a more uniform gas temperature distribution throughout the furnace, further improving the uniformity of heating of different parts of the workpiece. Furthermore, a sealing mechanism between the turntable assembly and the furnace chamber ensures furnace sealing and guarantees optimal reaction results.

[0020] Furthermore, the high-temperature rotary heating furnace disclosed in this invention has a firing plate that can support multiple materials, thereby improving reaction efficiency. It is equipped with a charging area, which allows for simple positioning of multiple materials and prevents them from colliding with each other when the firing plate rotates. At the same time, the surface of the charging area is provided with anti-slip patterns to prevent materials from moving or even slipping off the charging area. The pores facilitate heat conduction.

[0021] Furthermore, the high-temperature rotary heating furnace disclosed in this invention has a furnace chamber with a round front and square rear shape. The front side is an arc surface, and the rear side is a square surface. The firing plate is connected to the feeding channel through the arc surface, which facilitates the reduction of the gap between the firing plate and the feeding channel, making connection easier and preventing material jamming. The retaining flange on the periphery of the firing plate can prevent heating residue from falling into the gap between the firing plate and the furnace chamber. A square receiving groove is provided on the inner side of the square surface. The height of the square receiving groove is lower than that of the firing plate, and it is a sunken type. A transition slope is provided between the furnace chamber, the firing plate and the square receiving groove. If the material accidentally slips off the firing plate during rotation, it will fall from the transition slope to the square receiving groove by its own gravity and centrifugal force. Finally, it can be retrieved by opening the maintenance furnace door, which can prevent material jamming and affect the rotation of the firing plate and the heating of the material.

[0022] Furthermore, in the high-temperature rotary heating furnace disclosed in this invention, a fixed oil seal knife is located at the bottom of the furnace shell and remains stationary, while a rotating oil seal knife is located at the bottom of the turntable assembly and rotates with the turntable assembly. The fixed oil seal knife and the rotating oil seal knife are inserted into the sealing oil in the annular oil seal cavity to dynamically seal the gap between the furnace shell and the turntable assembly. The annular oil seal cavity is equipped with an oil level gauge, and sealing oil is replenished through the oil filling port when oil needs to be added. The annular oil seal cavity is a cooling water tank, and cooling water is circulated inside to directly cool the oil. The cooling water tank is also equipped with a water level gauge to detect the water level in the cooling water tank.

[0023] Furthermore, in the high-temperature rotary heating furnace disclosed in this invention, the temperature control thermocouple detects the temperature inside the furnace and sends it to the control module. The control module controls the heating power of the heating components, thereby achieving the purpose of adjusting the heating temperature inside the furnace. The temperature control thermocouple and the calibration thermocouple are parallel and vertically arranged, which facilitates the calibration of the temperature control thermocouple after it has deviated from its intended use over a period of time. Attached Figure Description

[0024] Figure 1 This is a front view cross-sectional structural diagram of the high-temperature rotary heating furnace of the present invention.

[0025] Figure 2 This is a side view cross-sectional structural diagram of the high-temperature rotary heating furnace of the present invention.

[0026] Figure 3 This is a schematic diagram of the structure of the firing plate in this invention.

[0027] Figure 4 This is a schematic diagram of the anti-jamming structure in this invention.

[0028] Figure 5 This is a schematic diagram of the sealing mechanism in this invention.

[0029] Figure 6 This is a schematic diagram of the rotary drive mechanism in this invention.

[0030] The labels in the diagram represent: 1. Frame; 12. Support feet; 13. Casters; 2. Furnace body; 21. Furnace shell; 22. Furnace chamber; 221. Feeding channel; 222. Maintenance channel; 223. Curved surface; 224. Square surface; 23. Inlet / outlet furnace door; 24. Heating assembly; 25. Maintenance furnace door; 26. Storage platform; 27. Detection mechanism; 28. Exhaust hood; 3. Turntable assembly; 31. Firing plate; 311. Clamping block; 312. Positioning hole; 313. Support column; 314. Pad; 315. Loading area; 316. Anti-slip pattern; 317. Air vent; 318. Material retaining flange; 32. Mounting base; 321. Chuck; 322. Pipe clamp; 323. Slot; 33. Insulation layer; 34. Turntable; 4. Rotary drive mechanism; 41. Support frame; 42. Hollow rotary table; 43. Planetary reducer; 44. Servo motor; 45. Cooling fan; 5. Sealing mechanism; 51. Annular oil seal cavity; 511. Filler port; 512. Oil level gauge; 52. Cooling water tank; 521. Water inlet; 522. Drain outlet; 523. Water outlet; 524. Water level gauge; 53. Fixed oil seal knife; 54. Rotating oil seal knife; 6. Anti-jamming structure; 61. Square receiving groove; 62. Transition slope; 7. Temperature measuring component; 71. Temperature control thermocouple; 72. Calibration thermocouple; 8. Opening and closing door mechanism; 9. Foot pedal. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] In this invention, unless otherwise explicitly specified and limited, the terms "assembly," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] Figures 1 to 6 An embodiment of the high-temperature rotary heating furnace of the present invention is shown. The high-temperature rotary heating furnace of this embodiment includes a frame 1 and a furnace body 2. The furnace body 2 includes a furnace shell 21, a furnace chamber 22 and a material inlet / outlet furnace door 23. The furnace shell 21 is mounted on the frame 1, the furnace chamber 22 is located inside the furnace shell 21, the material inlet / outlet furnace door 23 is located at one end of the furnace shell 21 and is connected to an opening and closing door mechanism 8, a heating assembly 24 is provided on the top of the furnace shell 21, a turntable assembly 3 and a rotary drive mechanism 4 for driving the turntable assembly 3 to rotate are also provided on the frame 1, the turntable assembly 3 passes through the furnace shell 21 and is located inside the furnace chamber 22, and a sealing mechanism 5 is provided between the turntable assembly 3 and the furnace chamber 22.

[0036] The heating process of the high-temperature rotary heating furnace is as follows: the opening and closing mechanism 8 drives the inlet and outlet furnace door 23 to open, the material is placed on the turntable assembly 3, the inlet and outlet furnace door 23 is closed, process gas and inert gas are introduced, the heating assembly 24 starts heating, and at the same time the rotation drive mechanism 4 drives the turntable assembly 3 to rotate.

[0037] In this high-temperature rotary heating furnace, the turntable assembly 3 rotates, causing the material to rotate, which improves the uniformity of material heating and ensures full contact with process gas and inert gas, thereby improving temperature uniformity, reducing material oxidation, and increasing the yield. At the same time, the rotation of the turntable assembly 3 can also promote gas circulation in the furnace, making the gas temperature distribution uniform throughout the furnace, thereby further improving the uniformity of heating of different parts of the workpiece. In addition, a sealing mechanism 5 is provided between the turntable assembly 3 and the furnace chamber 22 to ensure the sealing of the furnace and ensure the reaction effect.

[0038] Preferably, the furnace shell 21 is a box-shaped structure welded from carbon steel profiles and steel plates, the frame 1 is a frame-type steel structure with lifting lugs on the top for overall hoisting and transfer, the furnace chamber 22 is constructed of DJM-30 mullite bricks, and the outer insulation material is made of 1500 zirconium-containing ceramic fiber modules, which are formed by folding and extruding fiber blankets and anchored to the side wall of the furnace shell 21; the top of the furnace shell 21 uses reaction-sintered silicon carbide square beams as supporting beams, and corundum mullite cover plates are laid on the beams to support the top insulation layer and reflect heat radiation, thereby improving heating efficiency. The furnace top insulation material is an integrated insulation top composed of 1500 zirconium-containing ceramic fiber modules, anchored to the furnace top cover flange, which can be lifted and removed at the same time as the top cover, making maintenance simple.

[0039] Preferably, the inlet / outlet furnace door 23 is located on the front of the furnace shell 21, allowing personnel to load and unload materials. It can be opened and closed manually or automatically. The outer shell is made of SUS304 stainless steel, and the furnace door insulation material is made of zirconium-containing 1500 type fiber products, with high-quality ceramic fiber cotton lining the perimeter. The furnace door frame is made of DJM-30 mullite brick, with spare bricks provided, allowing for flexible adjustment of the furnace door size. High-quality ceramic fiber cotton is also lining the perimeter of the furnace door frame. The opening and closing mechanism 8 is a cylinder, controlling the vertical lifting and closing. The descent speed is ≥70mm / s. Stainless steel slide rails are located on both sides of the furnace door to guide and limit its lifting and lowering. The tracks at the furnace door curve inwards. When the door closes, it generates positive pressure on the furnace door frame, ensuring the fiber cotton adheres tightly and achieving a seal. A manual lever on the side allows for manual opening when there is no compressed air or a power outage. A foot pedal 9 controls the opening and closing, which is linked with the turntable assembly 3 and can be adjusted using a time relay. Specifically, pressing the foot pedal 9 opens the furnace door automatically. After the operator places the workpiece onto the turntable assembly 3 inside the furnace using a clamp, pressing the foot pedal 9 closes the furnace door automatically. Above the foot pedal 9 is an emergency stop lever, which can stop the equipment with one button in case of an emergency. The opening and closing actions are independent of the power supply to the heating assembly 24 and do not affect the heating power supply.

[0040] Preferably, the heating assembly 24 includes 12 high-quality ED-type silicon carbide rods, with 6 rods connected at the front and 6 at the back to form a heating zone. The silicon carbide rods are evenly distributed at different heights, and the external wiring is located inside the carbon steel heating box, which is sealed with an outer cover plate. The heating box uses stainless steel electrodes and aluminum braided straps to connect the silicon carbide rods for power supply, and is fitted with short ceramic tubes and ceramic insulating plugs. A three-phase star connection is used, ensuring balanced power supply and high stability.

[0041] Preferably, the inlet and outlet furnace door 23 is equipped with an exhaust hood 28 made of SUS304 stainless steel. When the furnace door is opened, the exhaust hood 28 can collect the hot air and lead it upwards, reducing the risk of hot air overflow and scalding personnel. The bottom of the frame 1 is equipped with rubber shock-absorbing support feet 12 and casters 13 to reduce the vibration and impact of the furnace body 2 and ensure stable operation of the equipment. The casters 13 are heavy-duty iron core polyurethane rollers, which can flexibly adjust the site position and orientation of the furnace body 2 according to the process layout, and are suitable for different workshops. A ladder is installed on the back of the furnace shell 21, which allows personnel to go up and down the furnace top for maintenance.

[0042] Furthermore, in this embodiment, the turntable assembly 3 includes a firing plate 31, a mounting base 32, a heat insulation layer 33, and a turntable 34. The turntable 34 is connected to the rotary drive mechanism 4. The heat insulation layer 33 is disposed on the turntable 34, and the firing plate 31 is mounted on the heat insulation layer 33 via the mounting base 32. The rotary drive mechanism 4 drives the turntable 34 to rotate, thereby causing the heat insulation layer 33, the mounting base 32, and the firing plate 31 to rotate. The heat insulation layer 33 is located below the firing plate 31, which can maintain the temperature inside the furnace, ensuring the reaction effect, and also provides some heat insulation to prevent damage to the rotary drive mechanism 4. Preferably, the heat insulation layer 33 is made of 1500 zirconium-containing ceramic fiber and is composed of multiple nested disc-shaped modules.

[0043] Furthermore, in this embodiment, the mounting base 32 includes a chuck 321 and a clamping tube 322. The chuck 321 is embedded in the insulation layer 33 and has a groove 323. The clamping tube 322 is located in the middle of the groove 323. The bottom of the firing plate 31 has a clamping block 311 and a positioning hole 312 in the middle. The clamping block 311 is engaged in the groove 323, and the positioning hole 312 is fitted over the clamping tube 322. The chuck 321 and the groove 323 are used to fix the firing plate 31 on the mounting base 32. Preferably, the chuck 321 and the clamping tube 322 are also made of reaction-sintered silicon carbide. The clamping tube 322 is installed vertically, and its top is higher than the positioning hole 312 to prevent the workpiece from falling into the positioning hole 312.

[0044] Furthermore, in this embodiment, the bottom of the firing pan 31 is provided with multiple support columns 313, which are arranged at intervals along the circumference of the firing pan 31. The support columns 313 are supported within the insulation layer 33, and a pad 314 is provided at the bottom. The support columns 313 provide uniform support to the circumference of the firing pan 31, avoiding pressure concentration that could cause the firing pan 31 to swing up and down. The pad 314 at the bottom of the support column 313 increases the contact area with the insulation layer 33, preventing pressure concentration from damaging the insulation layer. Preferably, the support columns 313 are made of hollow spheres.

[0045] Furthermore, such as Figure 3 As shown, in this embodiment, the firing pan 31 has multiple charging zones 315, which are arranged at intervals along the circumference of the firing pan 31. Each charging zone 315 has anti-slip patterns 316 and pores 317. The firing pan 31 can support multiple materials, improving reaction efficiency. The charging zones 315 allow for simple positioning of multiple materials, preventing them from colliding with each other when the firing pan 31 rotates. The anti-slip patterns 316 on the surface of the charging zones 315 prevent material movement or slippage. The pores 317 facilitate heat conduction. Preferably, the firing pan 31 is made of reaction-sintered silicon carbide, which has good high-temperature resistance.

[0046] Furthermore, such as Figure 4As shown, in this embodiment, the furnace shell 21 has a maintenance door 25 at the other end, the furnace chamber 22 has a feeding channel 221 at one end and a maintenance channel 222 at the other end. The feeding channel 221 is located between the inlet / outlet furnace door 23 and the firing plate 31. The inner side of the furnace chamber 22 has a spliced ​​arc surface 223 and a square surface 224. The arc surface 223 is set close to the feeding channel 221. The firing plate 31 is connected to the feeding channel 221 through the arc surface 223. The periphery of the firing plate 31 has a baffle flange 31 of the same height as the feeding channel 221. 8. The square face 224 is located near the maintenance passage 222. An anti-jamming structure 6 is also provided between the furnace 22 and the firing plate 31. The anti-jamming structure 6 includes a square receiving groove 61 and a transition slope 62. The square receiving groove 61 is located inside the square face 224. The height of the square receiving groove 61 is lower than that of the firing plate 31, and the width is greater than that of the feeding passage 221. The feeding passage 221 and the square receiving groove 61 are located on opposite sides of the firing plate 31. The transition slope 62 is located between the furnace 22, the firing plate 31 and the square receiving groove 61. The inner side of the furnace chamber 22 is round at the front and square at the back. The front side is an arc surface 223, and the rear side is a square surface 224. The firing plate 31 is connected to the feeding channel 221 through the arc surface 223, which makes it easier to reduce the gap between the firing plate 31 and the feeding channel 221, which is conducive to connection and avoids material jamming. The retaining flange 318 on the periphery of the firing plate 31 can prevent heating residue from falling into the gap between the firing plate 31 and the furnace chamber 22. The inner side of the square surface 224 is provided with a square receiving groove. 61. The height of the square receiving trough 61 is lower than that of the firing plate 31, and it is a sunken type. A transition slope 62 is provided between the furnace 22, the firing plate 31 and the square receiving trough 61. If the material accidentally slips off the firing plate 31 during rotation, it will fall from the transition slope 62 to the square receiving trough 61 by its own gravity and centrifugal force. Finally, it can be retrieved by opening the maintenance furnace door 25. This can avoid material jamming, which would affect the rotation of the firing plate 31 and the heating of the material.

[0047] Preferably, servo motor current monitoring is added to monitor abnormal conditions of the firing plate 31 in a timely manner; the maintenance furnace door 25 is normally closed and located at the rear of the furnace shell 21. The outer shell is made of carbon steel, and the door frame is a hollow structure with joints to allow cooling water to pass through to cool the sealing surface and sealing strip. The sealing method is to use foamed silicone rubber sealing strips, which are pressed and sealed by the fastening handwheel on the outer ring of the furnace door; the insulation material of the maintenance furnace door 25 is divided into two parts: one is a 1400 type customized polycrystalline mullite fiber module fixed on the furnace door shell, and the other is a movable insulation plug brick on the inner side, which is made of 1500 zirconium-containing fiber products. This structure can improve the insulation performance while reducing the corrosion of the furnace door fixing insulation material to improve the service life of the furnace door.

[0048] Furthermore, such as Figure 5As shown, in this embodiment, the sealing mechanism 5 includes an annular oil seal cavity 51, a cooling water tank 52, a fixed oil seal knife 53, and a rotating oil seal knife 54. The annular oil seal cavity 51 is located inside the cooling water tank 52. The fixed oil seal knife 53 and the rotating oil seal knife 54 are both located inside the annular oil seal cavity 51. The fixed oil seal knife 53 is located at the bottom of the furnace shell 21, and the rotating oil seal knife 54 is located at the bottom of the turntable assembly 3. The bottom of the cooling water tank 52 is connected to a water inlet 521 and a water outlet 522, and the top is connected to a water outlet 523. The cooling water tank 52 is also equipped with a water level gauge 524, and the annular oil seal cavity 51 is equipped with a filling port 511 and an oil level gauge 512. The fixed oil seal knife 53 is located at the bottom of the furnace shell 21 and remains stationary, while the rotating oil seal knife 54 is located at the bottom of the turntable assembly 3 and rotates with the turntable assembly 3. Both the fixed oil seal knife 53 and the rotating oil seal knife 54 are inserted into the sealing oil in the annular oil seal cavity 51 to dynamically seal the gap between the furnace shell 21 and the turntable assembly 3. The annular oil seal cavity 51 is equipped with an oil level gauge 512, and sealing oil is replenished through the oil filling port 511 when needed. The annular oil seal cavity 51 is also a cooling water tank 52, through which cooling water is circulated to directly cool the oil. The cooling water tank 52 is also equipped with a water level gauge 524 to detect the water level in the cooling water tank 52. Preferably, the cooling water tank 52 is made of SUS304 stainless steel; the sealing oil is a high-temperature resistant, low-volatility lubricating oil; the rotating oil seal knife 54 is detachably connected to the turntable assembly 3 for easy disassembly and replacement; both the fixed oil seal knife 53 and the rotating oil seal knife 54 are made of arc-shaped plates.

[0049] Furthermore, in this embodiment, a temperature measuring component 7 is provided on the top of the furnace shell 21. The temperature measuring component 7 includes a temperature control thermocouple 71 and a calibration thermocouple 72. The temperature control thermocouple 71 and the calibration thermocouple 72 are parallel and vertically arranged. The temperature control thermocouple 71 is electrically connected to the control module, and the control module is electrically connected to the heating component 24. The temperature control thermocouple 71 detects the temperature inside the furnace and sends it to the control module. The control module controls the heating power of the heating component 24, thereby achieving the purpose of adjusting the heating temperature inside the furnace. The parallel and vertical arrangement of the temperature control thermocouple 71 and the calibration thermocouple 72 facilitates the calibration of the temperature control thermocouple 71 after it deviates from its intended use over a period of time. Preferably, both the temperature control thermocouple 71 and the calibration thermocouple 72 are platinum-rhodium S-type thermocouples with Class I accuracy, encased in corundum protective sleeves, fixed to the furnace top flange, and vertically arranged in the middle of the furnace shell 21. The two temperature control thermocouples 71 control the furnace temperature, while the one calibration thermocouple 72 performs over-temperature alarm and records sampling. The thermocouples are positioned more than 300mm from the furnace door, and are fixed by a compression sleeve structure with nuts tightening the sealing ring, maintaining the cold end more than 500mm from the furnace shell 21 to reduce the impact of furnace temperature on the terminals. The vertical distance of the thermocouples is adjustable. An independent over-temperature alarm is used for control and temperature monitoring of the kiln cavity. A dot-type hybrid paper recorder is used for temperature monitoring, which can simultaneously display multiple points digitally, alarm, and print, offering better compatibility, simple internal data communication, and a low error rate. It is particularly suitable for the continuous operation of this rotary heating furnace, allowing for the traceability and preservation of the temperature curve of the heated workpiece as evidence of process data.

[0050] More preferably, it also includes a temperature controller and a power regulator. The closed-loop control system of the temperature control system is composed of heating component 24, temperature measuring component 7, temperature controller and power regulator, etc., and performs continuous PID regulation. The heating element is a silicon carbide rod, and the heating element is isolated by a transformer. There are two sets of isolation transformers, which are placed under the furnace shell 21 with isolation covers and connected to the frame 1 as one unit. The capacity of a single unit is selected as 50kVA, and the efficiency is ≥95% to ensure the power grid quality. The secondary is floating grounded and connected to the heating element. The temperature controller is a full-range input digital indication temperature controller, and the control power regulator (hereinafter referred to as SCR) implements PID "on / off" regulation. The temperature controller is installed in a temperature control cabinet with cabinet air conditioning to ensure its normal operating temperature. The SCR is a three-phase thyristor power regulator with an integrated integrated structure module and a built-in regulating switch. The regulator uses constant current mode to regulate the power of the heating element and PID regulation.

[0051] Furthermore, in this embodiment, a photoelectric sensor is provided on the frame 1, and a reflector is provided at the bottom of the turntable assembly 3. A zero-position mark is provided on the reflector, and the photoelectric sensor faces the reflector. The zero-point position of the turntable assembly 3 can be limited and calibrated, which facilitates the identification and control of the rotation angle of the turntable assembly 3. It should be noted that neither the photoelectric sensor nor the reflector is shown.

[0052] Furthermore, in this embodiment, a storage platform 26 is provided on the outside of the inlet / outlet furnace door 23, and a detection mechanism 27 is provided on the furnace shell 21. The detection mechanism 27 is used to detect the movement status of the inlet / outlet furnace door 23 and the storage status of the storage platform 26. The storage platform 26 can temporarily place materials and at the same time play a role in isolating and protecting the dangerous area of ​​the furnace door.

[0053] Preferably, such as Figure 6 As shown, the rotary drive mechanism 4 includes a support frame 41, a hollow rotary table 42, a planetary reducer 43, and a servo motor 44. The hollow rotary table 42, the planetary reducer 43, and the servo motor 44 are sequentially connected to form the main body. The hollow rotary table 42 has mounting holes on its surface, which can be used to fix the turntable 34 by bolts. The turntable 34 and the hollow rotary table 42 are connected by a rigid coupling sleeve. The sleeve has reinforcing ribs around its perimeter to increase the structural strength of the turntable 34 and prevent the turntable 34 from swaying when the material is unevenly loaded.

[0054] More preferably, the hollow rotary table 42 is a heavy-duty hollow rotary table with a reduction ratio of 1:24 and a maximum load of 1200 kgf. It adopts a roller transmission structure, with the drive cam and needle roller bearings preloaded for backlash-free rolling transmission, eliminating sliding friction and maintaining backlash-free characteristics. It has high repeatability accuracy in both forward and reverse motion, as well as high rigidity and heavy-load characteristics. The other end of the input shaft of the hollow rotary table 42 is equipped with an extended handwheel, allowing manual rotation during power outages. The servo motor 44 is selected with a rated power of 3.5 kW and a rated speed of 2000 r / min. An AC motor, equipped with an angle encoder, can display the rotation angle and output indexing signals, ensuring smooth rotation and reliable stopping of the turntable 34; the hollow rotary table 42 and the inlet / outlet furnace door 23 are equipped with linkage and zero-return functions, and the hollow rotary table 42 can be set to stepless speed regulation rotation or intermittent indexing rotation; a separate cooling fan 45 is installed on the side of the servo motor 44 to directly blow heat off the motor and ensure the normal operating temperature of the motor; the bottom of the support frame 41 is height adjustable, which is convenient for disassembly, assembly and debugging, and positioning plates are provided around the support frame 41 for fixed positioning.

[0055] Preferably, the high-temperature rotary heating furnace also includes a monitoring system. The monitoring system consists of a touch screen and a programmable logic controller (PLC). The touch screen interface displays and saves operating status, operating data, system parameters, and alarm information, enabling human-machine interaction. It can display sintering curves (including temperature curves of each temperature zone at the same time and temperature curves of the same temperature zone at different times), collect, monitor, save, and record process data, and is equipped with a USB interface for outputting saved data. It also has a DCS communication interface for transmitting temperature data. The operating data can display the operating status of the heating system, including material level settings, current material level, rotary table speed, and servo speed. The system displays the status of the motor, alarm information, temperature, and other data. A parameter modification interface allows for adjustments to parameters such as rotation speed and temperature settings for each zone. Data transmission allows the system to import control system information into the central control room, and a monitoring access port is reserved. The touchscreen automatically saves information such as temperature, inverter frequency, and turntable position at regular intervals, and allows for querying. The control cabinet is equipped with standard automation integration options, providing standard automation interfaces, including robotic arm motion signal interfaces, which can connect to external loading and unloading robots to achieve automatic control of loading, heating, and unloading, integrating into the process chain. All electrical control systems are installed in the electrical box of furnace body 2 and can operate as a whole with furnace body 2.

[0056] Preferably, the high-temperature rotary heating furnace also has protection and alarm functions, including furnace temperature abnormality protection, thermocouple abnormality alarm, turntable abnormality alarm, leakage protection, over / under voltage protection, electrical overheat protection, mechanical component protection, cooling water abnormality alarm, and anti-jamming protection. The furnace temperature abnormality protection will automatically stop heating when the furnace temperature detected by the temperature measuring point exceeds the set maximum temperature, and will alarm when the deviation is too large. Thermocouple abnormality will prompt and alarm and display the cause code. Rotary table malfunction will prompt and alarm. If leakage occurs or voltage changes suddenly, the power supply can be intelligently and automatically cut off quickly in case of overvoltage, undervoltage, or leakage. The electrical overheat protection function is specifically that the transformer box is equipped with temperature detection and fan cooling, and the temperature controller box is equipped with cabinet air conditioning cooling. In case of overheating, the cooling temperature can be automatically adjusted for protection. The bottom of the frame 1 is equipped with protective mesh covers around the perimeter to protect the moving parts area. The annular oil seal cavity 51 and the cooling water tank 52 are respectively equipped with oil level gauge 512 and water level gauge 524, with water level alarm function.

[0057] Preferably, when multiple batches of workpieces need to undergo pre-forging heating treatment, the process status is first set on the touch screen, specifically including temperature profile, process gas flow rate, rotation speed, etc. If the material is fed in a hot state, it is started directly after the settings are completed. When the rotary heating furnace reaches the target temperature, the material position to be used is selected on the touch screen, and the foot pedal 9 is pressed. The firing plate 31 automatically rotates the loading area 315 to the direction of the inlet / outlet furnace door 23. The workpieces are clamped and placed sequentially on the loading area 315 using high-temperature resistant clamps. After the batch of workpieces is placed, the next batch of workpieces needs to be placed. After selecting and confirming the new material position on the touch screen, the firing plate 31 rotates to the new loading area 315 and continues to feed the material. The above operation is repeated until all workpieces are placed in the corresponding loading area 315. When the door closing pedal is pressed, the furnace door closes, and the workpiece undergoes a heat treatment process inside the furnace while being heated as it rotates with the loading area 315. When heating is complete, if the workpiece is to be discharged while still hot, the loading area 315 to be discharged is set on the touch screen. After confirmation, when the door opening switch is pressed, the heating plate 31 rotates to the loading area 315 facing the front door, and the furnace door opens simultaneously. Personnel use clamps to remove the workpieces from the furnace one by one. The workpieces can be sent to the next forging process, etc. At the same time, the empty material position can be used to load the next batch of workpieces for heat treatment. The above operations can complete the continuous pre-forging heat treatment process for multiple batches of workpieces. The equipment is equipped with automation and signal interfaces, which can realize the signal transmission and control of the automatic line control and the rotary heating furnace, and realize the robot to replace the manual loading and unloading operations, greatly improving production efficiency.

[0058] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A high-temperature rotary heating furnace, characterized in that: The furnace includes a frame (1) and a furnace body (2). The furnace body (2) includes a furnace shell (21), a furnace chamber (22), and an inlet / outlet furnace door (23). The furnace shell (21) is mounted on the frame (1). The furnace chamber (22) is located inside the furnace shell (21). The inlet / outlet furnace door (23) is located at one end of the furnace shell (21) and is connected to an opening / closing mechanism (8). A heating assembly (24) is provided on the top of the furnace shell (21). The frame (1) is also equipped with a turntable assembly (3) and a rotation drive mechanism (4) for driving the turntable assembly (3) to rotate. The turntable assembly (3) passes through the furnace shell (21) and is located inside the furnace chamber (22). A sealing mechanism (5) is provided between the turntable assembly (3) and the furnace chamber (22). The turntable assembly (3) includes... The furnace consists of a firing plate (31), a mounting base (32), an insulation layer (33), and a turntable (34). The turntable (34) is connected to a rotary drive mechanism (4). The insulation layer (33) is located on the turntable (34). The firing plate (31) is mounted on the insulation layer (33) via the mounting base (32). The furnace shell (21) has a maintenance door (25) at one end. The furnace chamber (22) has a feeding channel (221) at one end and a maintenance channel (222) at the other end. The feeding channel (221) is located between the inlet / outlet furnace door (23) and the firing plate (31). The inner side of the furnace chamber (22) has a spliced ​​arc surface (223) and a square surface (224). The arc surface (223) is located near the feeding channel (221). The firing plate (31) is connected to the feeding channel (221) via an arc surface (223). The firing plate (31) has a retaining flange (318) of the same height as the feeding channel (221) on its periphery. The square surface (224) is located near the maintenance channel (222). An anti-jamming structure (6) is also provided between the furnace (22) and the firing plate (31). The anti-jamming structure (6) includes a square receiving groove (61) and a transition slope (62). The square receiving groove (61) is located inside the square surface (224). The height of the square receiving groove (61) is lower than that of the firing plate (31), and the width is greater than that of the feeding channel (221). The feeding channel (221) and the square receiving groove (61) are respectively located on the firing plate (31). On opposite sides of 1), the transition slope (62) is located between the furnace (22), the firing plate (31) and the square receiving trough (61). The sealing mechanism (5) includes an annular oil seal cavity (51), a cooling water tank (52), a fixed oil seal knife (53) and a rotating oil seal knife (54). The annular oil seal cavity (51) is located inside the cooling water tank (52). The fixed oil seal knife (53) and the rotating oil seal knife (54) are both located inside the annular oil seal cavity (51). The fixed oil seal knife (53) is located at the bottom of the furnace shell (21), and the rotating oil seal knife (54) is located at the bottom of the turntable assembly (3). The bottom of the cooling water tank (52) is connected to the inlet (521) and the outlet (522), and the top is connected to the outlet (523).The cooling water tank (52) is also equipped with a water level gauge (524), and the annular oil seal cavity (51) is equipped with an oil filler port (511) and an oil level gauge (512).

2. The high-temperature rotary heating furnace according to claim 1, characterized in that: The mounting base (32) includes a chuck (321) and a clamping tube (322). The chuck (321) is embedded in the insulation layer (33). The chuck (321) has a groove (323). The clamping tube (322) is located in the middle of the groove (323). The bottom of the heating plate (31) has a clamping block (311) and a positioning hole (312) in the middle. The clamping block (311) is clamped in the groove (323), and the positioning hole (312) is sleeved on the outside of the clamping tube (322).

3. The high-temperature rotary heating furnace according to claim 2, characterized in that: The bottom of the firing plate (31) is provided with multiple support columns (313), which are arranged at intervals around the circumference of the firing plate (31). The support columns (313) are supported in the insulation layer (33) and are provided with pads (314) at the bottom.

4. The high-temperature rotary heating furnace according to claim 1, characterized in that: The firing pan (31) is provided with multiple loading areas (315), which are arranged at intervals along the circumference of the firing pan (31). The loading areas (315) are provided with anti-slip patterns (316) and air holes (317).

5. The high-temperature rotary heating furnace according to any one of claims 1 to 4, characterized in that: The furnace shell (21) is provided with a temperature measuring component (7) at the top. The temperature measuring component (7) includes a temperature control thermocouple (71) and a calibration thermocouple (72). The temperature control thermocouple (71) and the calibration thermocouple (72) are parallel and vertically arranged. The temperature control thermocouple (71) is electrically connected to the control module. The control module is electrically connected to the heating component (24).

6. The high-temperature rotary heating furnace according to any one of claims 1 to 4, characterized in that: The frame (1) is equipped with a photoelectric sensor, the bottom of the turntable assembly (3) is equipped with a reflector, the reflector is equipped with a zero position mark, and the photoelectric sensor faces the reflector.

7. The high-temperature rotary heating furnace according to any one of claims 1 to 4, characterized in that: A storage platform (26) is provided on the outside of the inlet / outlet furnace door (23), and a detection mechanism (27) is provided on the furnace shell (21). The detection mechanism (27) is used to detect the movement status of the inlet / outlet furnace door (23) and the storage status of the storage platform (26).

Images