An austenitic stainless steel billet uniform heating mechanism and heating furnace

Abstract

The application relates to an austenitic stainless steel blank uniform heating mechanism and a heating furnace, and belongs to the technical field of stainless steel heating. The mechanism comprises a supporting seat, a flow guide frame, a flow guide cover, a return air baffle, heating resistance wires, a fixed cylinder and an impeller. When the impeller rotates, the driving airflow forms a cycle, realizing uniform convection heating of the blank. The heating furnace comprises two groups of the above heating mechanisms arranged in an upper-lower mode, a heating furnace body, a conveying mechanism and multiple turnover mechanisms. The turnover mechanism is provided with a protective shielding cover with a protective strip and air holes. During the movement of the conveying mechanism, the protective shielding cover and the internal blank are driven to be turned in multiple dimensions through the meshing and friction of the gear and the rack and the friction between the friction strip and the rotating ring body, so that the blank is alternately heated on each surface. The application solves the technical problems that the bottom surface of the blank is prone to low-temperature 'black print' and the edges and corners are prone to overburning in traditional heating, and realizes rapid and uniform heating of the austenitic stainless steel blank.

Description

Technical Field

[0001] This invention belongs to the field of stainless steel heating technology, and relates to a uniform heating mechanism and furnace for austenitic stainless steel billets. Background Technology

[0002] Austenitic stainless steel, with its excellent corrosion resistance, mechanical properties, and processing performance, is increasingly widely used in high-end fields such as food machinery, medical devices, and chemical equipment. As a core process in stainless steel production, the heating quality of austenitic stainless steel billets directly determines the precision and microstructure stability of the finished products in subsequent rolling and forging processes. Due to the low thermal conductivity and high coefficient of thermal expansion of austenitic stainless steel, it is prone to thermal stress caused by temperature differences during heating, leading to billet cracking and uneven microstructure. Therefore, extremely high requirements are placed on heating uniformity.

[0003] Currently, the mainstream austenitic stainless steel billet heating equipment in the industry mainly includes flame heating furnaces, resistance heating furnaces, and induction heating furnaces. Their core structure generally relies on the design logic of "fixed support + segmented heating + mechanical flipping". However, in practical applications, many technical bottlenecks have been exposed: the billet support structure has inherent defects. Existing equipment mostly uses fixed slide rails, rigid pads, or walking beams as support components. The bottom surface of the billet is in contact with the support components for a long time. Due to continuous heat dissipation, a low-temperature "black mark" forms in the contact area. The temperature difference between this area and other parts of the billet can reach 15~25℃, which leads to stress concentration cracking during subsequent rolling. Although some equipment has added a flipping mechanism, the flipping is mostly a single-dimensional 90° rotation. The edges and corners of the billet are always exposed to high-temperature radiation, which can easily lead to overheating or excessive oxide layer due to concentrated heating, further reducing the material utilization rate.

[0004] Therefore, we propose a uniform heating mechanism and furnace for austenitic stainless steel billets to solve the problems mentioned above. Summary of the Invention

[0005] In view of this, in order to solve the above problems, the present invention provides a uniform heating mechanism and heating furnace for austenitic stainless steel billets.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a uniform heating mechanism for austenitic stainless steel billets, comprising:

[0007] Support base;

[0008] A flow guide frame is fixedly mounted on the top of the support base;

[0009] A flow guide shroud is fixedly installed at the top of the flow guide frame, and an air outlet is provided on its side;

[0010] A return air baffle is fixedly installed on the top of the air guide shroud and has an exhaust port.

[0011] A heating resistance wire is disposed within the flow guiding frame;

[0012] A fixed cylinder is fixedly installed on the top of the flow guide frame, and a rectangular opening is provided on its outer side facing the heating resistance wire;

[0013] An impeller is rotatably mounted inside the fixed cylinder and located below the exhaust port of the return air baffle. An opening corresponding to the air outlet of the guide shroud is provided on the outer side of the impeller.

[0014] And an electric motor I, the output of which is connected to the impeller to drive the impeller to rotate;

[0015] When the motor I drives the impeller to rotate, the airflow is drawn in from the exhaust port of the return air baffle, flows through the rectangular opening of the fixed cylinder and is heated by the heating resistance wire, and is blown out from the air outlet of the guide shroud through the opening of the impeller, forming a circulating heated airflow.

[0016] As a further improvement to the above technical solution:

[0017] Two arc-shaped baffles are fixedly installed inside the flow guide frame, symmetrically arranged, and the two heating resistance wires are surrounded in the heat-gathering space between them.

[0018] An austenitic stainless steel billet heating furnace includes two sets of uniform heating mechanisms for austenitic stainless steel billets as described in claim 2, and further includes:

[0019] The heating furnace body consists of a lower furnace body and an upper furnace body, with the two sets of heating mechanisms respectively disposed in the lower furnace body and the upper furnace body;

[0020] A conveying mechanism, located inside the upper furnace body, is used to drive the turning mechanism carrying the billet to move within the heating furnace body.

[0021] The device includes multiple flipping mechanisms, each comprising a base plate and a protective shield rotatably disposed on the top of the base plate. The inner wall of the protective shield is provided with protective strips for protecting the edges and corners of the billet, and the shield wall is provided with multiple circular through holes for circulating heating airflow to pass through.

[0022] As a further improvement to the above technical solution:

[0023] The conveying mechanism includes:

[0024] Two sets of guide rails are installed inside the upper furnace body;

[0025] The transmission chain meshes with sprocket I on one side of the guide rail, sprocket II at the bottom, and guide rollers inside the guide rail.

[0026] And an electric motor II, used to drive the sprocket II to rotate, thereby driving the transmission chain to move cyclically along the guide rail;

[0027] The base plate of the flipping mechanism is connected to the transmission chain.

[0028] A sliding block is fixedly provided on the inner side of the transmission chain, a positioning pin is provided on the top of the sliding block, and an insertion hole is provided on the bottom of the base plate to engage with the positioning pin.

[0029] The inner side of the guide rail is fixedly provided with a support bar located below the sliding block.

[0030] A rotating shaft is provided through the base plate, and a rotating disk is fixed to the top of the rotating shaft. The protective shield is rotatably mounted on the rotating disk.

[0031] A transmission gear is fixed at the bottom end of the rotating shaft, and multiple transmission racks that cooperate with the transmission gear are fixed at the top of the lower guide shroud.

[0032] A fixed ring is fixed to the top of the rotating shaft, and a rotating ring is rotatably provided inside the fixed ring via a bearing. The rotating ring is fixedly connected to the protective shielding cover via a connecting column.

[0033] The bottom of the upper air guide is fixed with multiple friction strips that can be used in conjunction with the rotating ring.

[0034] One end of the lower furnace body is provided with a feed inlet, and the feed inlet is provided with a sliding sealing baffle and an electric push rod for driving the sealing baffle.

[0035] The bottom of the lower furnace body is provided with a guide rail for guiding the movement of the base plate.

[0036] The beneficial effects of this invention are as follows:

[0037] 1. The austenitic stainless steel billet uniform heating mechanism and heating furnace disclosed in this invention have a thickened protective shield 87 that can absorb heat in the furnace by means of its own material heat capacity, avoiding a sudden rise in temperature in local areas, and forming a stable temperature field in the furnace in conjunction with the circulating airflow system; the protective strip 871 can physically block heat radiation from directly acting on the edges and corners of the billet, solving the problem of excessively high temperature of the edges and corners of the billet due to direct radiation and excessive temperature difference with the main body in traditional heating.

[0038] 2. The austenitic stainless steel billet uniform heating mechanism and heating furnace disclosed in this invention use a circulating airflow system to return the heat-exchanged airflow to the heating area for secondary utilization via a return air baffle, thereby reducing heat loss; the heat-gathering effect of the arc-shaped baffle improves the heat utilization efficiency of the heating resistance wire and avoids heat dispersion and loss.

[0039] 3. The austenitic stainless steel billet uniform heating mechanism and heating furnace disclosed in this invention, when the flipping mechanism moves, the transmission gear meshes with the rack and pinion, and the rotating ring rubs against the friction strip to form a multi-dimensional flipping, so that each surface and part of the billet alternately contacts the thermal environment, completely solving the pain point of "low temperature on the bottom surface and overheating at the edges" in traditional heating, controlling the overall heating temperature difference of the billet within a very small range, ensuring uniform internal structure of the billet, and reducing the risk of cracking during subsequent rolling.

[0040] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0041] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0042] Figure 1 This is a three-dimensional structural schematic diagram of a uniform heating mechanism for austenitic stainless steel billets according to the present invention.

[0043] Figure 2 This is an exploded structural diagram of a uniform heating mechanism for austenitic stainless steel billets according to the present invention.

[0044] Figure 3 This is a three-dimensional structural schematic diagram of an austenitic stainless steel billet heating furnace according to the present invention;

[0045] Figure 4 This is a schematic diagram of the lower furnace body structure of an austenitic stainless steel billet heating furnace according to the present invention;

[0046] Figure 5 This is a schematic diagram of the installation structure of the conveying mechanism of an austenitic stainless steel billet heating furnace according to the present invention;

[0047] Figure 6 This is a schematic diagram of the transmission chain and sprocket I of an austenitic stainless steel billet heating furnace according to the present invention;

[0048] Figure 7 This is a schematic diagram of the connection structure between the transmission chain and the base plate of an austenitic stainless steel billet heating furnace according to the present invention.

[0049] Figure 8 This is a schematic diagram of the tilting mechanism of an austenitic stainless steel billet heating furnace according to the present invention.

[0050] Figure 9This is a cross-sectional schematic diagram of the protective shielding cover for an austenitic stainless steel billet heating furnace according to the present invention.

[0051] Reference numerals: 1. Support base; 2. Guide frame; 21. Arc-shaped baffle; 22. Fixed cylinder; 23. Rectangular inlet; 24. Impeller; 25. Motor I; 3. Guide shroud; 4. Return air baffle; 5. Heating resistance wire; 6. Heating furnace body; 61. Feed inlet; 62. Sealing baffle; 63. Electric push rod; 64. Upper furnace body; 65. Lower furnace body; 7. Conveying mechanism; 71. Guide rail; 72. Motor II; 73. Sprocket I; 74. Guide 75. Roller; 76. Support bar; 77. Transmission chain; 78. Drive rod; 79. Sprocket II; 70. Sliding block; 710. Positioning pin; 81. Tilting mechanism; 82. Base plate; 83. Rotating shaft; 84. Rotating disk; 85. Fixed ring; 86. Rotating ring; 87. Connecting column; 88. Protective shield; 89. Protective strip; 80. Circular through hole; 810. Transmission gear; 82. Transmission rack; 83. Friction strip; 9. Guide rail. Detailed Implementation

[0052] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0053] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0054] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present 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, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0055] Example 1

[0056] like Figures 1-2 As shown, an austenitic stainless steel billet uniform heating mechanism includes a support base 1. The support base 1 serves as the load-bearing foundation of the entire heating mechanism and is integrally cast from a heat-resistant alloy material. Its structure is stable and can withstand thermal stress under high-temperature environments. Pre-drilled mounting holes at its bottom allow for fixing to the ground using expansion bolts, preventing displacement due to vibration during operation. Multiple flow guide frames 2 are uniformly fixed along the length of the top of the support base 1. Each flow guide frame 2 is a one-piece stamped heat-resistant steel frame with internal reinforcing ribs to enhance structural stability under high temperatures and prevent distortion and deformation due to prolonged heating. A flow guide shroud 3 is tightly fixed to the top of each flow guide frame 2 using bolts. The flow guide shroud 3 is a ceramic shroud with an arc-shaped curved surface. This curved design guides airflow smoothly and reduces airflow resistance. Symmetrical air outlets are located on both sides of the flow guide shroud 3, and the opening direction of the air outlets is calibrated to ensure that the blown hot airflow accurately covers the central billet area.

[0057] The return air baffle 4 is fixedly installed on the top of the flow guide shroud 3. It is made of heat-resistant steel plate of moderate thickness, and the connection between the edge and the flow guide shroud 3 is equipped with a high-temperature resistant sealing strip to prevent heat from leaking out through gaps. An exhaust vent is centrally located at the top of the return air baffle 4. The exhaust vent and the airflow channel inside the flow guide shroud 3 form a complete circulation path, allowing the heat-exchanged airflow to flow back smoothly and re-enter the heating cycle. Two heating resistance wires 5 are arranged in parallel within the internal cavity of the flow guide frame 2. The heating resistance wires 5 are fixed inside the frame by an insulating ceramic bracket to avoid direct contact with the metal frame and short circuit. The ceramic bracket also has good high-temperature resistance and will not be damaged during heating. Two arc-shaped baffles 21 are also fixed inside the flow guide frame 2. The curvature of the arc baffles 21 matches the internal contour of the flow guide frame 2, effectively concentrating the heat generated by the heating resistance wires 5, reducing heat loss to the outside of the flow guide frame 2, and guiding the airflow to concentrate on the area of ​​the heating resistance wires 5, improving heat exchange efficiency.

[0058] The top of the flow guide frame 2 is fixed to a fixed cylinder 22 via a flange connection. High-temperature resistant graphite gaskets are installed between the flanges to ensure the sealing of the connection and prevent airflow leakage. Two rectangular openings 23 are symmetrically opened on the outer side of the fixed cylinder 22. The opening direction of the rectangular openings 23 faces the heating resistance wire 5, allowing the airflow inside the fixed cylinder 22 to flow fully through the area of ​​the heating resistance wire 5, completing heat absorption. Inside the fixed cylinder 22, an impeller 24 is rotatably mounted via a high-temperature resistant bearing. The blades of the impeller 24 are smoothly treated to reduce airflow friction loss. Its central axis coincides with the central axis of the fixed cylinder 22 and is located directly below the exhaust port of the return air baffle 4, ensuring that the airflow can enter the impeller 24 area vertically. The bottom of the flow guide frame 2 is fixedly mounted with the motor I 25 by the motor bracket. The connection between the motor bracket and the flow guide frame 2 is fixed by welding to prevent the motor I 25 from shaking during operation. The output end of the motor I 25 is fixedly connected to the central shaft of the impeller 24 by a coupling. The coupling is equipped with an anti-loosening nut to prevent loosening during high-speed rotation and to ensure that the heated airflow can be accurately delivered from the air outlet to the billet area during rotation.

[0059] Example 2

[0060] like Figures 1-9 As shown, an austenitic stainless steel billet heating furnace includes the aforementioned austenitic stainless steel billet uniform heating mechanism, and also includes a heating furnace body 6.

[0061] The heating furnace body 6 is composed of a lower furnace body 65 and an upper furnace body 64. Both the lower furnace body 65 and the upper furnace body 64 adopt a double-layer jacketed heat-resistant steel structure, with insulation material filling the interlayer, which can effectively reduce heat loss from the furnace and reduce energy consumption. The two sets of uniform heating mechanisms mentioned above are fixed inside the lower furnace body 65 and the upper furnace body 64 respectively by bolts, forming a symmetrical heating structure to ensure that the left and right surfaces of the billet can be heated simultaneously. Both ends of the lower furnace body 65 are provided with feed ports 61, and the edges of the feed ports 61 are provided with guide bevels to facilitate the smooth entry and exit of austenitic stainless steel billets from the furnace body and avoid bumping the edges and corners of the billets.

[0062] The conveying mechanism 7 is located inside the upper furnace body 64 and includes two sets of guide rails 71. The guide rails 71 are grooved heat-resistant steel rails embedded in grooves inside the guide shroud 3. The rails have pre-set grease grooves for periodic addition of high-temperature grease to reduce sliding friction loss. Two sprockets I 73 are rotatably mounted on one side of the guide rails 71 via a rotating shaft. The teeth of the sprockets I 73 are hardened to improve hardness and wear resistance. Bearings are installed at the connection between the rotating shaft and the rail to ensure smooth rotation. The bottom of the two sets of guide rails 71 is rotatably supported by drive rods 77 via bearing seats. Adjustable shims are provided at the bottom of the bearing seats, allowing adjustment of the drive rods 77's level by adding or removing shims to prevent uneven force during operation. A sprocket II 78 is fixed to the outer wall of the drive rod 77 via a flat key, with the position of sprocket II 78 precisely corresponding to sprocket I 73. A guide roller 74 is rotatably mounted in the groove inside the guide rail 71 via a rotating shaft. The guide roller 74 is made of a high-temperature resistant material with a certain degree of elasticity, which can reduce the hard impact with the transmission chain 76 and prevent the chain from deviating during movement. The outer walls of the two sprockets I 73, the guide roller 74, and the sprocket II 78 on the same side are connected to the same transmission chain 76. The motor II 72 is fixed to one side of the lower furnace body 65 by a motor mounting base. The fixing bolts of the motor mounting base are anti-loosening bolts to prevent the bolts from loosening due to vibration during motor operation. The output end of the motor II 72 is connected to one end of the drive rod 77 through a sprocket and a chain. The drive rod 77 can drive the sprocket II 78 to rotate under the drive of the motor II 72, thereby driving the transmission chain 76 to circulate along the trajectory of the guide rail 71.

[0063] Multiple flipping mechanisms 8 are evenly arranged on two transmission chains 76 on the same side. When the transmission chains 76 are running, they can drive the flipping mechanisms 8 to move smoothly within the heating furnace body 6. The flipping mechanism 8 includes a base plate 81 and a protective shield 87. The base plate 81 is made of heat-resistant steel plate of moderate thickness, and the surface is sprayed with a high-temperature resistant coating to prevent high-temperature oxidation and rust. The protective shield 87 is a rectangular cylindrical heat-resistant steel cover, which is rotatably mounted on the top of the base plate 81. Its internal cavity can completely accommodate the austenitic stainless steel billet. Protective strips 871 are fixed at the corner positions inside the protective shield 87. High-temperature resistant silicone pads are attached to the inner side of the protective strips 871, which can not only limit the billet, but also, during the heating process, the thickened protective shield 87 uses the heat capacity of the material itself to absorb heat. The protective strips 871 physically block heat radiation from directly heating the edges of the billet, forcing heat to be transferred mainly from the plane. The outer wall of the protective shield 87 is evenly provided with multiple circular through holes 872, and the edges of the through holes are rounded to ensure that the heating airflow can pass through the shield evenly and make full contact with the blank, avoiding the formation of airflow dead zones inside the shield.

[0064] Multiple sliding blocks 79 are fixedly installed on the inner side of the transmission chain 76. The sliding blocks 79 are made of high-temperature and wear-resistant material, which can maintain good mechanical properties even in high-temperature environments. A positioning pin 710 is fixedly installed on the top of the sliding block 79. The bottom of the base plate 81 has a hole that matches the positioning pin 710. The positioning pin 710 and the hole adopt a transition fit, which facilitates the installation and disassembly of the flipping mechanism 8 and ensures the stability of the connection, making it easy for subsequent maintenance and replacement. A support bar 75 is fixedly installed on the inner side of the guide rail 71. The support bar 75 is located directly below the sliding block 79. Its top surface is in close contact with the bottom surface of the sliding block 79, which can support the sliding block 79 and the flipping mechanism 8 and the blank above it, preventing the transmission chain 76 from sagging due to excessive load and ensuring transmission accuracy.

[0065] A rotating shaft 82 is rotatably mounted through the top of the base plate 81. A bearing is installed at the connection between the rotating shaft 82 and the base plate 81, and a damping washer is added to the bearing mating point to provide appropriate rotational resistance, preventing the rotating shaft 82 from rotating on its own when no external force is applied. A rotating disk 83 is fixedly mounted on the top of the rotating shaft 82, and a protective shield 87 is mounted on top of the rotating disk 83. A transmission gear 88 is fixedly mounted at the bottom end of the rotating shaft 82, and multiple transmission racks 89 that cooperate with the transmission gear 88 are fixedly mounted on the top of the lower guide shroud 3. The tooth flank clearance between the transmission gear 88 and the transmission racks 89 is precisely adjusted to avoid impact and noise during meshing, while ensuring transmission accuracy. When the tilting mechanism 8 moves, the transmission gear 88 rolls along the transmission racks 89, thereby driving the rotating shaft 82 and the rotating disk 83 to rotate synchronously.

[0066] Two fixed rings 84 are fixedly mounted on the top of the rotating shaft 82. These two fixed rings 84 are symmetrically distributed along the top of the rotating disk 83. A rotating ring 85 is rotatably mounted on the inner side of each fixed ring 84 via a bearing. Damping washers are also provided at the bearing engagement between the rotating ring 85 and the fixed ring 84, preventing it from rotating independently without external force. Multiple connecting posts 86 are fixedly mounted on the inner walls of each of the two rotating rings 85. The inner ends of the connecting posts 86 are fixedly connected to the outer wall of the protective shield 87 using argon arc welding, ensuring a strong weld joint and preventing desoldering at high temperatures. Multiple friction strips 810, which cooperate with the rotating rings 85, are fixedly mounted at the bottom of the upper guide shroud 3. The surfaces of the friction strips 810 are tightly fitted to the outer wall of the rotating rings 85, with the fit precisely adjusted to ensure sufficient friction to drive the rotating rings 85 to rotate without causing jamming due to excessive friction. When the flipping mechanism 8 moves, the friction between the rotating ring 85 and the friction strip 810 will cause the rotating ring 85 to rotate, which in turn will drive the protective shield 87 to rotate relative to the rotating disk 83 through the connecting column 86, so that the billet can be flipped in multiple dimensions.

[0067] A sealing baffle 62 is mounted on one end of the lower furnace body 65, which can slide up and down via a slide rail slider assembly. The slider of the slide rail slider assembly contains ball bearings to reduce sliding resistance and allow the sealing baffle 62 to move smoothly up and down. The dimensions of the sealing baffle 62 are adapted to the feed inlet 61, and its edges are equipped with high-temperature resistant sealing strips to ensure a complete seal of the feed inlet 61 when closed, preventing heat loss from the furnace. Two electric push rods 63 are fixedly mounted on this end of the lower furnace body 65. The output ends of the electric push rods 63 are fixedly connected to the top of the sealing baffle 62. The brackets of the electric push rods 63 are welded to the lower furnace body 65 to ensure that the brackets do not wobble during operation. When the electric push rods 63 extend or retract, they can drive the sealing baffle 62 to slide up and down, thus opening and closing the feed inlet 61.

[0068] The bottom of the lower furnace body 65 is provided with a guide rail 9 for guiding the base plate 81. The guide rail 9 has an L-shaped groove structure. A slider adapted to the guide rail 9 is fixedly installed on the bottom of the base plate 81. The slider slides inside the guide rail 9, which can accurately guide the movement of the base plate 81, ensuring the stability of the movement trajectory of the flipping mechanism 8 and avoiding deviation. The surface of the guide rail 9 is coated with a wear-resistant coating to extend its service life. When the base plate 81 enters from one feed port 61 and exits from the other feed port 61, it can be placed on the guide rail 9 and pushed in the opposite direction.

[0069] The operation process of the austenitic stainless steel billet heating furnace is as follows: First, start the electric push rod 63. The electric push rod 63 retracts and drives the sealing baffle 62 to slide upward, opening the feed port 61. The operator puts the austenitic stainless steel billet to be heated into the protective shield 87. The protective strip 871 will limit the billet to prevent it from shifting during the movement. The base plate 81 is placed on the two sliding blocks 79 on the inner side of the transmission chain 76, so that the positioning pin 710 is inserted into the insertion hole at the bottom of the base plate 81.

[0070] Subsequently, the electric push rod 63 extends, causing the sealing baffle 62 to slide down and close the feed inlet 61, ensuring the airtightness of the furnace.

[0071] Next, the heating resistance wire 5 is started, and the heating resistance wire 5 begins to heat up. At the same time, the motor I25 is started, and the motor I25 drives the impeller 24 to rotate slowly, drawing the airflow in the furnace into the fixed cylinder 22. The airflow is heated when it flows through the rectangular opening 23 on the outside of the fixed cylinder 22 and passes through the area of ​​the heating resistance wire 5. The heated airflow is blown from the air outlet of the guide shroud 3 to the billet under the action of the impeller 24. After completing the heat exchange with the billet, the airflow flows back into the fixed cylinder 22 through the exhaust port of the return air baffle 4, forming a stable airflow circulation.

[0072] Then, the motor II 72 is started. The motor II 72 drives the drive rod 77 to rotate, the drive rod 77 drives the sprocket II 78 to rotate, and then drives the transmission chain 76 to circulate along the track of the guide rail 71. The transmission chain 76 drives the flipping mechanism 8 to move slowly inside the heating furnace body 6.

[0073] During the movement of the flipping mechanism 8, when the transmission gear 88 contacts the transmission rack 89, the transmission rack 89 and the transmission gear 88 can drive the rotating shaft 82 and the rotating disk 83 to rotate, which can drive the protective shield 87 to rotate horizontally. When the transmission gear 88 contacts the transmission rack 89 and moves away, the protective shield 87 rotates 90°, which can heat the other two sides until it contacts the next transmission rack 89, and continues to rotate horizontally by 90° to return to the initial state.

[0074] Continue moving, rotate the ring 85 to contact the friction strip 810, and use the friction between them to drive the rotating ring 85 to rotate. Through the connecting column 86, drive the protective shield 87 to rotate relative to the rotating disk 83, so that the billet can be flipped in multiple dimensions during the movement, avoiding long-term contact of a single part with the low temperature area.

[0075] Once the billet is heated to the required temperature, the operator removes the heated billet, completing one heating cycle.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A uniform heating mechanism for austenitic stainless steel billets, characterized in that, include: Support base (1); The flow guide frame (2) is fixedly installed on the top of the support base (1); A flow guide shroud (3) is fixedly installed at the top of the flow guide frame (2), and an air outlet is provided on its side; The return air baffle (4) is fixedly installed on the top of the air guide shroud (3) and has an exhaust port; Heating resistance wire (5) is disposed within the flow guiding frame (2); A fixed cylinder (22) is fixedly installed on the top of the flow guide frame (2), and a rectangular opening (23) facing the heating resistance wire (5) is provided on its outer side. The impeller (24) is rotatably disposed inside the fixed cylinder (22) and located below the exhaust port of the return air baffle (4). An opening corresponding to the air outlet of the guide shroud (3) is provided on the outer side of the impeller (24). And an electric motor I (25), the output end of which is connected to the impeller (24) for driving the impeller (24) to rotate; When the motor I (25) drives the impeller (24) to rotate, the airflow is drawn in from the exhaust port of the return air baffle (4), flows through the rectangular opening (23) of the fixed cylinder (22) and is heated by the heating resistance wire (5), and is blown out from the air outlet of the guide shroud (3) through the opening of the impeller (24) to form a circulating heated airflow.

2. The uniform heating mechanism for austenitic stainless steel billets according to claim 1, characterized in that, The flow guide frame (2) is fixed with two arc-shaped baffles (21), which are symmetrically arranged and enclose the two heating resistance wires (5) in the heat-gathering space.

3. An austenitic stainless steel billet heating furnace, comprising two sets of uniform heating mechanisms for austenitic stainless steel billets as described in claim 2, characterized in that, Also includes: The heating furnace body (6) is composed of a lower furnace body (65) and an upper furnace body (64), and the two sets of heating mechanisms are respectively arranged in the lower furnace body (65) and the upper furnace body (64); A conveying mechanism (7) is provided inside the upper furnace body (64) and is used to drive the turning mechanism (8) that carries the billet to move inside the heating furnace body (6); And multiple flipping mechanisms (8), each flipping mechanism (8) includes a base plate (81) and a protective shield (87) rotatably disposed on the top of the base plate (81). The inner wall of the protective shield (87) is provided with protective strips (871) for protecting the edges and corners of the blank, and its shield wall is provided with multiple circular through holes (872) for circulating heating airflow to pass through.

4. The austenitic stainless steel billet heating furnace according to claim 3, characterized in that, The conveying mechanism (7) includes two sets of guide rails (71) disposed inside the upper furnace body (64); The transmission chain (76) meshes with the sprocket I (73) on one side of the guide rail (71), the sprocket II (78) at the bottom, and the guide roller (74) inside the guide rail (71); And an electric motor II (72) is used to drive the sprocket II (78) to rotate, thereby driving the transmission chain (76) to move cyclically along the guide rail (71); The base plate (81) of the flipping mechanism (8) is connected to the transmission chain (76).

5. The austenitic stainless steel billet heating furnace according to claim 4, characterized in that, The inner side of the transmission chain (76) is fixedly provided with a sliding block (79), the top of the sliding block (79) is provided with a positioning pin (710), and the bottom of the base plate (81) is provided with a socket for insertion and engagement with the positioning pin (710).

6. The austenitic stainless steel billet heating furnace according to claim 5, characterized in that, The inner side of the guide rail (71) is fixedly provided with a support bar (75) located below the sliding block (79).

7. The austenitic stainless steel billet heating furnace according to claim 3, characterized in that, A rotating shaft (82) is provided through the base plate (81), and a rotating disk (83) is fixed on the top of the rotating shaft (82). The protective shield (87) is rotatably mounted on the rotating disk (83). The bottom end of the rotating shaft (82) is fixed with a transmission gear (88), and the top of the lower guide shroud (3) is fixed with a plurality of transmission racks (89) that cooperate with the transmission gear (88).

8. The austenitic stainless steel billet heating furnace according to claim 7, characterized in that, A fixed ring (84) is fixed to the top of the rotating shaft (82), and a rotating ring (85) is rotatably provided inside the fixed ring (84) via a bearing. The rotating ring (85) is fixedly connected to the protective shield (87) via a connecting column (86). The bottom of the upper guide shield (3) is fixed with a plurality of friction strips (810) that can be used in conjunction with the rotating ring (85).

9. The austenitic stainless steel billet heating furnace according to claim 3, characterized in that, The lower furnace body (65) is provided with a feed inlet (61) at one end, and a sliding sealing baffle (62) and an electric push rod (63) for driving the sealing baffle (62) are provided at the feed inlet (61).

10. The austenitic stainless steel billet heating furnace according to claim 3, characterized in that, The bottom of the lower furnace body (65) is provided with a guide rail (9) for guiding the movement of the base plate (81).

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