Annealing furnace for corrosion-resisting steel material processing

Abstract

The invention relates to the technical field of annealing furnaces, and discloses an annealing furnace for corrosion-resisting steel material machining, the annealing furnace comprises a net-shaped furnace barrel, a fixed furnace body, a sliding rail mounted on the fixed furnace body and a movable furnace body slidably connected with the sliding rail, a heat insulation machine cavity is formed in the movable furnace body, and a multi-axis composite motion system is mounted in the heat insulation machine cavity; a furnace frame capable of reciprocating in the horizontal direction and the vertical direction and a reciprocating shaft capable of rotating in a reciprocating mode in a set period are connected to the multi-shaft composite motion system, the reciprocating displacement stroke and the displacement frequency of the furnace frame change periodically, and a cradle capable of swinging in a reciprocating mode is rotationally installed on the furnace frame. The furnace frame is driven by the multi-shaft composite motion system to periodically reciprocate in the horizontal direction and the vertical direction, and the reciprocating shaft and the cradle cooperatively swing, so that the steel achieves three-dimensional composite motion of translation, overturning and vibration superposition in the net-shaped furnace barrel, and compared with a traditional static or one-way rotary heating mode, the heating efficiency is greatly improved. By means of the design, the problem of local overheating or insufficient heating during steel annealing is effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of annealing furnaces, and more particularly to an annealing furnace for processing corrosion-resistant steel materials. Background Art

[0002] In the production process of steel, annealing is a very critical step. Annealing helps to reduce the hardness of steel, improve its machinability, eliminate residual stress, and refine grains. In the prior art, the patent document with publication number CN221071571U discloses a steel annealing furnace that is easy to ship, including a bottom plate and a movable assembly. The top of the bottom plate is fixedly connected to the furnace body by screws. The top of the furnace body is rotatably mounted with a rotating shaft. The external fixed sleeve of the rotating shaft is provided with a furnace cover. A visual window is installed on the outer peripheral surface of the furnace body. A placement plate is fixedly connected to one side of the bottom plate by screws. A control panel is installed on the top of the placement plate. The above device achieves a more efficient discharge effect, but the above device has the following technical problems when used: In the field of corrosion-resistant steel processing, annealing furnaces are key equipment, and their performance directly affects the microstructural uniformity, surface quality, and mechanical properties of steel. In traditional annealing furnaces, the static or unidirectional rotating heating mode causes a fixed contact surface between the steel and the heat source, resulting in localized overheating or insufficient heating. The standard deviation of the grain size distribution after annealing is high. Traditional equipment relies on manual or fixed brushes to remove the oxide scale on the steel surface, resulting in insufficient cleaning coverage. The residual oxide layer will reduce the corrosion resistance of the steel. Based on this, the present invention provides an annealing furnace for processing corrosion-resistant steel materials to solve the technical problems raised in the above background technology. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides an annealing furnace for processing corrosion-resistant steel. The present invention drives the furnace frame to periodically reciprocate in the horizontal and vertical directions through a multi-axis composite motion system, and combines the coordinated swing of the reciprocating axis and the cradle to enable the steel to achieve three-dimensional composite motion of translation, flipping and vibration superposition in the mesh furnace drum. Compared with the traditional static or unidirectional rotation heating mode, this design effectively avoids the problem of local overheating or insufficient heating during steel annealing.

[0004] To achieve the above-mentioned object, the present invention provides the following technical solution: an annealing furnace for processing corrosion-resistant steel, comprising a mesh furnace drum, a fixed furnace body, a slide rail mounted on the fixed furnace body, and a movable furnace body slidably connected to the slide rail, wherein the movable furnace body is provided with an insulated machine cavity, wherein a multi-axis compound motion system is installed in the insulated machine cavity, wherein the multi-axis compound motion system is connected to a furnace frame that can reciprocate in the horizontal and vertical directions and a reciprocating shaft that can reciprocate within a set period, wherein the reciprocating displacement stroke and displacement frequency of the furnace frame vary periodically, and a cradle that can reciprocate is rotatably installed on the furnace frame The mesh furnace drum is rotatably mounted on the cradle, and a furnace shaft is rotatably mounted on the inner wall of the mesh furnace drum. The furnace shaft rotates coaxially with the cradle and in opposite directions. The cradle and the mesh furnace drum are driven by a reciprocating shaft. A sealed furnace seat is mounted on the furnace shaft, and the sealed furnace seat is rotatably connected to the mesh furnace drum. Two brush shafts are rotatably mounted on the sealed furnace seat, and spiral brush rings for cleaning the oxide layer on the surface of steel are mounted on the two brush shafts. A gear ring is mounted on the mesh furnace drum, and driven gears meshing with the gear ring are mounted on the tail ends of the two brush shafts. A furnace cover is hinged on the end of the mesh furnace drum.

[0005] As an optimal technical solution of the present invention, two symmetrically arranged burners are installed on the fixed furnace body, a smoke exhaust pipe and a blower connected to the inner cavity of the fixed furnace body are respectively installed on the fixed furnace body, and a central control host and a handle are respectively installed on the end face of the movable furnace body.

[0006] As a preferred technical scheme of the present application, the multi-axis compound motion system comprises a support installed in the heat insulation cavity, a horizontal motion frame, a servo motor installed on the support, a circular shaft rotatably connected to the support, a horizontal screw rod and an inner horizontal shaft, a notch gear a and a notch gear b are respectively installed on the output shaft of the servo motor, two symmetrical power interruption portions are arranged on the output shaft of the servo motor and correspond to the positions between the notch gear a and the notch gear b, a differential gear a in transmission connection with the notch gear a and a differential gear b in transmission connection with the notch gear b are respectively installed on the circular shaft, differential bevel gears are installed on the circular shaft and the inner horizontal shaft, the two differential bevel gears are in mesh with each other, a first chain belt is in transmission with the two horizontal screw rods, the two horizontal screw rods are in transmission with the horizontal motion frame, an outer horizontal shaft, two vertical screw rods and a reciprocating sleeve shaft are rotatably installed on the horizontal motion frame, the outer horizontal shaft is driven by the inner horizontal shaft, driving bevel gears are installed on the outer horizontal shaft and the reciprocating sleeve shaft, the two driving bevel gears are in mesh with each other, a second chain belt is in transmission with the two vertical screw rods, the two vertical screw rods are in transmission with the furnace frame, the reciprocating shaft is rotatably installed on the furnace frame and is driven by the reciprocating sleeve shaft, and helical torsion springs are arranged at the rotatable connections between the horizontal screw rods and the support and between the vertical screw rods and the horizontal motion frame.

[0007] As a preferred technical scheme of the present application, a first hexagonal groove with a tail end opening and in sliding connection with the inner horizontal shaft is fixed in the inner part of the outer horizontal shaft, a square shaft section is fixedly arranged on the reciprocating shaft, a second hexagonal groove with a bottom end opening and in sliding connection with the square shaft section is fixed in the inner part of the reciprocating sleeve shaft, and the cross sections of the first hexagonal groove, the second hexagonal groove, the inner horizontal shaft and the square shaft section are all regular hexagons.

[0008] As a preferred technical scheme of the present application, the tooth part of the notch gear a corresponds to a central angle of 160°, the tooth part of the notch gear b corresponds to a central angle of 100°, and the toothless section between the notch gear a and the notch gear b corresponds to a central angle of 100° in the circumferential direction, the modulus of the notch gear a is 6 to 9 times that of the differential gear a, and the modulus of the notch gear b is 1 to 2.5 times that of the differential gear b.

[0009] As a preferred technical solution of the present invention, rocking shafts rotatably connected to the furnace frame are installed on both sides of the cradle, a bevel gear shaft is rotatably installed between the two rocking shafts, a first synchronous shaft and an outer shaft are rotatably installed on the furnace frame, an inner transmission shaft is rotatably installed on the inner wall of the outer shaft, two fan gears are installed on the outer shaft, and rocking gears are installed on the two rocking shafts. The two rocking gears are respectively connected to the two fan gears for transmission, the inner transmission shaft and the bevel gear shaft are installed with linkage gears, and the two linkage gears are meshed with each other. The reciprocating shaft is connected to the first synchronous shaft for transmission through a third chain belt, the outer shaft and the inner transmission shaft are both installed with a first lateral bevel gear, the bottom end of the first synchronous shaft is installed with a first intermediate bevel gear, the two first lateral bevel gears are both connected to the first intermediate bevel gear for transmission, and the two first lateral bevel gears are respectively arranged on both sides of the first intermediate bevel gear, a wheel shaft is rotatably installed on the cradle, and synchronous bevel gears are installed on the wheel shaft and the bevel gear shaft, the two synchronous bevel gears are meshed with each other, and a fourth chain belt is connected for transmission between the wheel shaft and the mesh furnace drum.

[0010] As a preferred technical solution of the present invention, the central angle of the tooth portion on the fan gear is 45°, and the radius of the fan gear is the same as that of the rocking gear.

[0011] As a preferred technical solution of the present invention, a second synchronous shaft is rotatably installed on the cradle, a second intermediate bevel gear is installed on the second synchronous shaft, a second lateral bevel gear is installed on the mesh furnace drum and the furnace shaft, the two second lateral bevel gears are both transmission-connected with the second intermediate bevel gear, and the two second lateral bevel gears are respectively arranged on both sides of the second intermediate bevel gear.

[0012] As a preferred technical solution of the present invention, a corrugated heat insulation plate is rotatably installed on the mesh furnace drum, and the corrugated heat insulation plate is welded to the moving furnace body as a whole. The corrugated heat insulation plate is a double-layer stainless steel corrugated plate with a ceramic fiber insulation layer filled in the middle with a thickness of 10mm to 15mm. The surface is sprayed with a high-temperature resistant alumina coating, the spiral brush ring is made of Hastelloy alloy, and the spiral directions of the two spiral brush rings are opposite. The mesh furnace drum is made of stainless steel.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention uses a multi-axis composite motion system to drive the grate to periodically reciprocate in the horizontal and vertical directions. Combined with the coordinated swinging of the reciprocating axis and the cradle, the steel can achieve a three-dimensional composite motion of translation, flipping, and vibration superposition within the mesh furnace drum. Compared with traditional static or unidirectional rotation heating modes, this design effectively avoids the problem of local overheating or insufficient heating during steel annealing.

[0014] 2. The present invention uses a linkage design of counter-rotating spiral brush rings and a mesh furnace drum. During the annealing process, the steel is continuously subjected to the combined action of bidirectional shear force and friction force, and the surface oxide scale is removed in real time. Compared with traditional fixed brushes or manual cleaning, the cleaning coverage rate is effectively improved and the thickness of the residual oxide layer is effectively reduced. This mechanism not only solves the problem of reduced corrosion resistance caused by residual oxide layer, but also avoids secondary pollution introduced by manual intervention, thereby effectively improving the surface finish of the steel.

[0015] 3. In the present invention, the central control host integrates servo motors, burners and multi-dimensional control of motion parameters. Through dynamic adaptation of three-dimensional composite motion trajectories, it ensures the optimization of annealing process parameters for steels of different specifications. Compared with the existing technology that relies on manual experience for adjustment, the stability of the annealing process is improved, and the movable furnace slide rail design simplifies the loading process and shortens the operation time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of an annealing furnace for processing corrosion-resistant steel materials according to the present invention; Figure 2 It is a structural schematic diagram of the furnace body of the present invention; Figure 3 This is a schematic structural diagram of the movable furnace body and furnace cover of the present invention; Figure 4 Schematic diagram of the structure of the servo motor and horizontal screw rod of the present invention; Figure 5 Schematic diagram of the structure of the second synchronization shaft and the cradle of the present invention; Figure 6 For the present invention Figure 5 Schematic diagram of the local enlarged structure at A in the middle; Figure 7 It is a structural schematic diagram of the furnace frame and the first synchronous shaft of the present invention; Figure 8 This is a schematic structural diagram of the sealed furnace seat and brush shaft of the present invention; Figure 9 It is a structural schematic diagram of the driven gear and the linkage gear of the present invention; Figure 10 This is a structural diagram of the circular shaft and notched gear a of the present invention; Figure 11 It is a structural schematic diagram of the cradle of the present invention; Figure 12 For the present invention Figure 11 Schematic diagram of the local enlarged structure at point B in the middle.

[0017] Figure: 1, mesh furnace drum; 2, fixed furnace body; 3, slide rail; 4, movable furnace body; 5, furnace frame; 6, reciprocating shaft; 7, cradle; 8, furnace shaft; 9, sealed furnace seat; 10, brush shaft; 11, spiral brush ring; 12, gear ring; 13, driven gear; 14, furnace cover; 15, burner; 16, central control host; 17, bracket; 18, horizontal motion frame; 19, servo motor; 20, round shaft; 21, horizontal screw rod; 22, inner flat shaft; 2 3. Notched gear a; 24. Notched gear b; 25. Differential gear a; 26. Differential gear b; 27. Outer flat shaft; 28. Vertical screw; 29. ​​Reciprocating sleeve shaft; 30. Rocking shaft; 31. Bevel gear shaft; 32. First synchronous shaft; 33. Outer shaft; 34. Inner transmission shaft; 35. Fan gear; 36. Rocking gear; 37. Axle; 38. Second synchronous shaft; 39. Corrugated insulation board; 40. Helical torsion spring; 41. Linkage gear. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] like Figures 1 to 12 As shown, the present invention provides an annealing furnace for processing corrosion-resistant steel materials, comprising a mesh furnace drum 1, a fixed furnace body 2, a slide rail 3 mounted on the fixed furnace body 2, and a movable furnace body 4 slidably connected to the slide rail 3; The movable furnace body 4 and the fixed furnace body 2 are sealed to form the whole annealing furnace; The fixed furnace body 2 is equipped with two symmetrically arranged burners 15, and the fixed furnace body 2 is respectively equipped with a smoke exhaust pipe and a blower connected to the inner cavity of the fixed furnace body 2. The end surface of the movable furnace body 4 is respectively equipped with a central control host 16 and a handle; The burner 15 is a fully premixed gas high-speed burner 15 , and the fuel type is natural gas or liquefied petroleum gas. The heating temperature of the burner 15 can be adjusted in the range of 800°C to 1150°C, and PID closed-loop temperature control is achieved through the central control host 16 ; The burners 15 symmetrically arranged on the fixed furnace body 2 are full premixed gas high-speed burners 15, which can use natural gas or liquefied petroleum gas as fuel. The heating temperature is adjustable within the range of 800°C to 1150°C. In conjunction with the central control host 16, PID closed-loop temperature control is realized, which can accurately control the temperature in the furnace to meet the different temperature conditions required for annealing of corrosion-resistant steel, ensuring stable and uniform annealing effect. The exhaust pipe discharges the exhaust gas generated by combustion in time to ensure a stable gas environment in the furnace. The air blower provides sufficient oxygen for combustion, promotes full combustion of fuel, improves energy utilization efficiency, and the central control host 16 on the movable furnace body 4 facilitates the real-time monitoring and adjustment of the operating parameters of the equipment by the operator, the handle facilitates the movement of the movable furnace body 4, and the operation is simple and convenient, thereby improving the operability and practicality of the equipment. In the working process, the operator sets the required temperature through the central control host 16, the burner 15 adjusts the combustion state according to the instruction, the air blower continuously delivers oxygen, the exhaust pipe discharges exhaust gas, and the movable furnace body 4 can slide on the slide rail 3 to facilitate the loading and unloading of steel materials. The entire process realizes automatic temperature control and convenient operation of the corrosion-resistant steel annealing process, solves the problems of inaccurate temperature control and inconvenient operation of traditional annealing furnaces, improves the annealing quality and production efficiency, and reduces labor costs compared with the prior art. The movable furnace body 4 is internally provided with a heat insulation cavity, and a multi-axis composite motion system is installed in the heat insulation cavity. The multi-axis composite motion system is connected with a furnace rack 5 that can reciprocate in the horizontal and vertical directions and a reciprocating shaft 6 that can reciprocate in a set period. The reciprocating displacement stroke and displacement frequency of the furnace rack 5 change periodically. The multi-axis composite motion system includes a support 17, a horizontal motion frame 18, a servo motor 19 installed on the support 17, a circular shaft 20 rotatably connected to the support 17, a horizontal screw 21, and an inner horizontal shaft 22. The output shaft of the servo motor 19 is respectively provided with a notched gear a 23 and a notched gear b 24. Two symmetrical power interruption parts are arranged on the output shaft of the servo motor 19 and correspond to the positions between the notched gear a 23 and the notched gear b 24. The circular shaft 20 is respectively provided with a differential gear a 25 in transmission connection with the notched gear a 23 and a differential gear b 26 in transmission connection with the notched gear b 24. The tooth part of the notched gear a 23 corresponds to a central angle of 160°, the tooth part of the notched gear b 24 corresponds to a central angle of 100°, and the toothless section between the notched gear a 23 and the notched gear b 24 corresponds to a central angle of 100° in the circumferential direction. The modulus of the notched gear a 23 is 8 times that of the differential gear a 25, and the modulus of the notched gear b 24 is 1.5 times that of the differential gear b 26. Multi-axis composite motion system drives gap gear a23 and gap gear b24 through servo motor 19, combines power interruption, uses differential gear a25, differential gear b26, differential bevel gear and a series of transmission of lead screw, chain and shaft, so that furnace rack 5 can move reciprocatingly in horizontal and vertical directions, and displacement stroke and frequency are periodically changed, while driving reciprocating shaft 6 to rotate reciprocatingly in a set period, and this complex motion mode can make corrosion-resistant steel placed on furnace rack 5 change position and angle continuously during annealing process, so that steel is heated more uniformly, and local overheating or insufficient heating is avoided, in working process, after servo motor 19 is started, its output shaft drives gap gear a23 and gap gear b24 to rotate, when the tooth part of gap gear a23 is engaged with differential gear a25, driving circular shaft 20 rotates, and then differential bevel gear drives inner horizontal shaft 22 to rotate, inner horizontal shaft 22 drives horizontal lead screw 21 through first chain, so that horizontal moving frame 18 moves horizontally; Similarly, gap gear b24 drives related components to realize motion control in vertical direction, and helical torsion spring 40 plays a buffering and resetting role, so as to ensure stability of motion; Multi-directional composite motion of furnace rack 5 makes steel uniformly turn in meshed furnace cylinder 1, avoids local overheating, ensures grain size distribution standard after annealing, spiral brush ring 11 rotates reversely with the inner wall of meshed furnace cylinder 1, dynamically scrapes off oxide skin on the surface of steel, periodic vibration promotes dislocation recombination in steel through mechanical energy transmission, eliminates residual stress of steel, composite motion accelerates recrystallization process, and average grain size of austenitic stainless steel is improved after annealing; 8 times transmission ratio of 160° tooth part of gap gear a23 and differential gear a25 ensures that driving period of horizontal motion covers complete stroke, while through the speed reduction effect of differential gear, the moving speed of horizontal lead screw 21 matches the horizontal displacement of furnace rack 5, so as to avoid motion overshoot or deficiency. 100° tooth part of gap gear b24 and 100° central angle of power interruption complement each other, intermittent driving of vertical motion is formed, 1.5 times transmission ratio is combined, the lifting frequency of vertical lead screw 28 is accurately controlled, so as to ensure the synchronization of vertical motion of furnace rack 5, the non-tooth interval of power interruption is misaligned with the engagement period of gap gear b24, mechanical interference caused by simultaneous driving of two-direction motion is avoided, and the stability of multi-axis composite motion is ensured.

[0020] At the same time in the power interruption, under the action of helical torsion spring 40, reciprocating shaft 6, horizontal lead screw 21 and vertical lead screw 28 are automatically reset and the rotation direction is reversed; The 8x transmission ratio of the notched gear a23 converts the high-speed rotation of the servo motor 19 into a low-speed, high-torque output of the horizontal screw 21 through the deceleration effect of the differential gear a25, adapting to the large-stroke reciprocating requirements in the horizontal direction. The 1.5x transmission ratio of the notched gear b24 balances the lifting speed and load requirements of the vertical screw 28 through the moderate deceleration of the differential gear b26, avoiding vibration or offset in the vertical direction due to inertia. The difference in the transmission ratios of the two gears forms a dynamic coordination of horizontal and vertical motions, ensuring the periodic change of the trajectory of the composite motion of the grate 5 and improving the uniformity of heating of the steel. At the same time, in the transmission interruption zone, the mesh furnace drum 1 is briefly stopped, so that the steel in the mesh furnace drum 1 can be subjected to the combustion annealing effect of the burner 15. With the cyclic switching of the notched gear a23, the notched gear b24 and the transmission interruption zone, on the one hand, the steel in the mesh furnace drum 1 is cyclically subjected to the low-frequency high-stroke reciprocating motion, the high-frequency low-stroke reciprocating motion and the pause annealing effect. On the other hand, the steel in the mesh furnace drum 1 can cyclically undergo the static annealing and the oxide layer removal process in the moving state, thereby effectively improving the annealing efficiency and annealing uniformity of the steel in the mesh furnace drum 1. Angles of 60° and 100° and transmission ratios of 8x and 1.5x are the optimal solutions verified by dynamic simulation and experiments: If the angle of the notched gear a23 increases, the horizontal motion stroke will exceed the mechanical limit. If the angle decreases, the stroke will be insufficient, resulting in uneven heating of the steel.

[0021] If the angle of the notched gear b24 increases, the speed of the vertical screw 28 will be too fast, which may easily cause vibration;.

[0022] The 100° central angle of the power interruption part precisely matches the meshing period of the notched gear B24, avoiding motion jamming caused by power overlap or insufficient interruption and ensuring transmission continuity.

[0023] Differential bevel gears are mounted on both the circular shaft 20 and the inner flat shaft 22, and the two differential bevel gears mesh with each other; A first chain belt is installed on the inner horizontal shaft 22, and two horizontal screw rods 21 are both connected to the first chain belt, and the two horizontal screw rods 21 are both connected to the horizontal motion frame 18; An outer horizontal shaft 27, two vertical screw rods 28 and a reciprocating sleeve shaft 29 are rotatably mounted on the horizontal motion frame 18. The outer horizontal shaft 27 is driven by the inner horizontal shaft 22. The outer flat shaft 27 is fixed with a first hexagonal groove with an opening at the rear end and is slidably connected to the inner flat shaft 22; The outer flat shaft 27 and the reciprocating sleeve shaft 29 are both equipped with guide bevel gears, and the two guide bevel gears are meshed with each other; A second chain belt is installed on the reciprocating sleeve 29, and the two vertical screw rods 28 are driven by the second chain belt. The two vertical screw rods 28 are connected to the furnace frame 5. The reciprocating shaft 6 is rotatably installed on the furnace frame 5 and is driven by the reciprocating sleeve 29. A square shaft segment is fixedly provided on the reciprocating shaft 6, and a second hexagonal groove with an opening at the bottom end and slidably connected to the square shaft segment is fixedly provided inside the reciprocating sleeve 29. The cross sections of the first hexagonal groove, the second hexagonal groove, the inner flat shaft 22 and the square shaft segment are all regular hexagons. A helical torsion spring 40 is provided at the rotation connection between the horizontal screw rod 21 and the bracket 17 , and at the rotation connection between the vertical screw rod 28 and the horizontal motion frame 18 .

[0024] The first hexagonal groove inside the outer flat shaft 27 is slidably connected to the inner flat shaft 22, and the square shaft section on the reciprocating shaft 6 is slidably connected to the second hexagonal groove inside the reciprocating sleeve shaft 29, and their cross sections are all regular hexagons. This structural design ensures the stability and accuracy of power transmission. During the operation of the equipment, when the inner flat shaft 22 rotates, the hexagonal groove structure can drive the outer flat shaft 27 to rotate synchronously. At the same time, the guide bevel gears between the outer flat shaft 27 and the reciprocating sleeve shaft 29 engage with each other, transmitting power to the reciprocating sleeve shaft 29, thereby driving the reciprocating shaft 6 to rotate. In the working process, when the inner flat shaft 22 rotates under the action of the multi-axis compound motion system, the hexagonal groove between it and the outer flat shaft 27 cooperates to make the outer flat shaft 27 rotate smoothly. The outer flat shaft 27 then transmits power to the reciprocating sleeve shaft 29, and finally realizes the stable rotation of the reciprocating shaft 6. This structure solves the problems of slippage and misalignment that may occur during the power transmission process. Compared with the existing technology, it improves the reliability of power transmission between the moving parts of the equipment, ensures the accuracy of related movements of corrosion-resistant steel during the annealing process, and helps to improve the annealing quality. A reciprocating cradle 7 is rotatably mounted on the furnace frame 5, and the mesh furnace drum 1 is rotatably mounted on the cradle 7. A furnace shaft 8 is rotatably mounted on the inner wall of the mesh furnace drum 1, and the furnace shaft 8 rotates coaxially with the cradle 7 in opposite directions. The cradle 7 and the mesh furnace drum 1 are both driven by the reciprocating shaft 6. A sealed furnace seat 9 is mounted on the furnace shaft 8, and the sealed furnace seat 9 is rotatably connected to the mesh furnace drum 1. Two brush shafts 10 are rotatably mounted on the sealed furnace seat 9, and both brush shafts 10 are mounted with spiral brush rings 11 for cleaning the oxide layer on the surface of steel. A gear ring 12 is mounted on the mesh furnace drum 1, and the tail ends of the two brush shafts 10 are mounted with driven gears 13 meshing with the gear ring 12. A furnace cover 14 is hinged at the end of the mesh furnace drum 1.

[0025] The cradle 7 can be rocked back and forth under the drive of the reciprocating shaft 6, driving the mesh furnace drum 1 to rotate. At the same time, the furnace shaft 8 and the cradle 7 rotate coaxially in opposite directions, so that the corrosion-resistant steel placed in the mesh furnace drum 1 continuously rolls and rotates during the annealing process, further promoting uniform heating. The spiral brush ring 11 on the sealed furnace seat 9 rotates through the engagement of the driven gear 13 at the tail end of the brush shaft 10 with the gear ring 12 on the mesh furnace drum 1. The two spiral brush rings 11 spiral in opposite directions, which can effectively clean the oxide layer on the surface of the steel and avoid the influence of the oxide layer on the performance of the steel. In the working process, after the reciprocating shaft 6 rotates, the cradle 7 is driven to rock through a series of transmission components, and the cradle 7 drives the mesh furnace drum 1 and the furnace shaft 8 to rotate. At the same time, the spiral brush ring 11 starts to work. This solution solves the problem of difficult cleaning of the surface oxide layer and uneven heating during the annealing process of corrosion-resistant steel. Compared with the existing technology, it not only improves the surface quality of the steel, but also improves the annealing effect and enhances the corrosion resistance of the steel. Both sides of the cradle 7 are equipped with rocking shafts 30 rotatably connected to the furnace frame 5. A bevel gear shaft 31 is rotatably mounted between the two rocking shafts 30. A first synchronization shaft 32 and an outer sleeve shaft 33 are rotatably mounted on the furnace frame 5. An inner transmission shaft 34 is rotatably mounted on the inner wall of the outer sleeve shaft 33. Two fan gears 35 are mounted on the outer sleeve shaft 33. Rocking gears 36 are installed on both rocking shafts 30, and the two rocking gears 36 are respectively connected to the two fan gears 35. The central angle of the tooth portion on the sector gear 35 is 45°, and the radius of the sector gear 35 and the rocking gear 36 are the same; Linkage gears 41 are mounted on both the inner transmission shaft 34 and the bevel gear shaft 31, and the two linkage gears 41 mesh with each other; The reciprocating shaft 6 is connected to the first synchronous shaft 32 through a third chain belt. The outer shaft 33 and the inner transmission shaft 34 are both equipped with first lateral bevel gears. The bottom end of the first synchronous shaft 32 is equipped with a first intermediate bevel gear. The two first lateral bevel gears are both connected to the first intermediate bevel gear. The two first lateral bevel gears are respectively arranged on both sides of the first intermediate bevel gear. A wheel axle 37 is rotatably installed on the cradle 7. Synchronous bevel gears are both installed on the wheel axle 37 and the bevel gear shaft 31. The two synchronous bevel gears are engaged with each other. A fourth chain belt is connected to the wheel axle 37 and the mesh furnace drum 1.

[0026] A second synchronous shaft 38 is rotatably mounted on the cradle 7, a second intermediate bevel gear is mounted on the second synchronous shaft 38, a second lateral bevel gear is mounted on both the mesh furnace drum 1 and the furnace shaft 8, the two second lateral bevel gears are both transmission-connected with the second intermediate bevel gear, and the two second lateral bevel gears are respectively arranged on both sides of the second intermediate bevel gear.

[0027] The rocking shafts 30 on both sides of the cradle 7 are connected to the first synchronous shaft 32, outer shaft 33, inner transmission shaft 34 and other components on the furnace frame 5 through the transmission connection. The fan gear 35, rocking gear 36, synchronous bevel gear and chain belt are used to achieve accurate power transmission and motion coordination between the components. The reciprocating shaft 6 drives the first synchronous shaft 32 to rotate through the third chain belt, and then drives the outer shaft 33, inner transmission shaft 34 and other components to operate, so that the cradle 7 can reciprocate according to the set rules, while ensuring the stable rotation of the mesh furnace drum 1 and the furnace shaft 8. In the working process, the rotation of the reciprocating shaft 6 provides initial power. After a series of bevel gears and chain belts, the cradle 7, mesh furnace drum 1 and furnace shaft 8 move in coordination. This transmission structure solves the problem of poor synchronization between the moving parts of the equipment. Compared with the existing technology, it improves the coordination and stability of the overall movement of the equipment, ensures the consistency of the movement state of the corrosion-resistant steel during the annealing process, and is conducive to improving the stability of the annealing quality. A corrugated heat insulation board 39 is rotatably installed on the mesh furnace drum 1. The corrugated heat insulation board 39 is welded to the moving furnace body 4 as a whole. The corrugated heat insulation board 39 is a double-layer stainless steel corrugated board with a ceramic fiber insulation layer filled in the middle with a thickness of 14 mm. The surface is sprayed with a high-temperature resistant alumina coating. The spiral brush ring 11 is made of Hastelloy alloy. The spiral directions of the two spiral brush rings 11 are opposite. The mesh furnace drum 1 is made of stainless steel.

[0028] This structure of the corrugated heat insulation board 39 has good heat insulation performance, can effectively reduce heat loss in the furnace, improve energy utilization, and at the same time protect the moving furnace body 4 from high temperature, thereby extending the service life of the equipment. The spiral brush ring 11 is made of Hastelloy, which has high hardness, wear resistance and good chemical stability. It can clean the oxide layer on the surface of steel in a long-term and stable manner under high temperature environment. The mesh furnace drum 1 is made of stainless steel, which is corrosion-resistant, ensuring that no secondary pollution is caused to the steel during the annealing process. In the work flow, after the annealing process starts, the corrugated heat insulation board 39 plays a heat insulation role, the spiral brush ring 11 cleans the oxide layer on the surface of the steel, and the mesh furnace drum 1 carries the steel. This solution solves the problems of large heat loss, easy damage to equipment and easy contamination of steel in traditional annealing furnaces. Compared with the existing technology, it improves energy utilization efficiency, reduces equipment maintenance costs, and improves the annealing quality and surface quality of corrosion-resistant steel. The cradle 7 swings back and forth, driving the mesh furnace drum 1 to flip periodically, so that the heated surface of the steel in the furnace continuously alternates, eliminating local temperature gradients and avoiding grain coarsening or uneven structure caused by static heating. Experimental data shows that compared with traditional unidirectional rotary annealing furnaces, reciprocating swing reduces the standard deviation of the yield strength of the annealed steel and improves the hardness uniformity. When the cradle 7 swings, the spiral brush ring 11 on the inner wall of the mesh furnace drum 1 rotates in the opposite direction to the rotating shaft, forming a combined effect of shear force and friction, which scrapes off the oxide scale on the steel surface in real time. If the reciprocating motion is eliminated, the spiral brush ring 11 and the mesh furnace drum 1 rotate in the same direction, which will greatly reduce the cleaning efficiency. The periodic mechanical vibration generated by the reciprocating swing is transmitted to the steel through the mesh furnace drum 1, promoting dislocation slip and recrystallization. The residual stress elimination rate is effectively improved compared with static annealing. The vibration energy accelerates the austenite nucleation. The reciprocating swing of the cradle 7 and the XY axis translation of the furnace frame 5 and the rotation of the reciprocating shaft 6 form a three-dimensional composite motion trajectory, ensuring that the steel undergoes translation, flipping and vibration simultaneously during the annealing process, thereby improving the overall energy efficiency ratio. The working principle and use process of the present invention: The annealing furnace drives the grate 5 to achieve periodic reciprocating movement in the horizontal and vertical directions through a multi-axis composite motion system, and at the same time drives the reciprocating shaft 6 to reciprocate at a set period. The output shaft of the servo motor 19 is installed with a notched gear a23 and a notched gear b24, which are respectively engaged with the differential gear a25 and the differential gear b26. The horizontal displacement is achieved by driving the horizontal screw rod 21 through the first chain belt, and the vertical movement is controlled by driving the vertical screw rod 28 through the second chain belt. The power interruption part ensures that the phases of the two axes do not overlap. The reciprocating shaft 6 drives the cradle 7 to swing back and forth at a set angle within a set period through the guide bevel gear set, driving the mesh The furnace drum 1 is turned over periodically, and the furnace shaft 8 and the cradle 7 rotate coaxially and in opposite directions, so that the steel is turned evenly in the mesh furnace drum 1. The spiral brush ring 11 rotates in opposite directions through the driven gear 13 and the ring gear 12, dynamically scraping off the oxide layer on the surface of the steel. The burner 15 adopts a fully premixed gas high-speed burner 15, and the heating temperature is controlled by PID closed loop. The blower adjusts the air-fuel ratio, the exhaust pipe maintains the gas balance in the furnace, and the corrugated insulation board 39 reduces heat loss. The central control host 16 adjusts the speed of the servo motor 19, the power of the burner 15 and the motion parameters in real time to form a three-dimensional composite motion trajectory to achieve uniform heating of the steel.

[0029] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0030] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An annealing furnace for processing corrosion-resistant steel, comprising a mesh furnace drum (1), a fixed furnace body (2), a slide rail (3) mounted on the fixed furnace body (2), and a movable furnace body (4) slidably connected to the slide rail (3), characterized in that: The interior of the movable furnace body (4) is provided with an insulating machine cavity, and a multi-axis composite motion system is installed in the insulating machine cavity. The multi-axis composite motion system is connected to a furnace frame (5) that can reciprocate in the horizontal and vertical directions and a reciprocating shaft (6) that can reciprocate within a set period. The reciprocating displacement stroke and displacement frequency of the furnace frame (5) change periodically. A reciprocating rocking frame (7) is rotatably installed on the furnace frame (5). The mesh furnace drum (1) is rotatably installed on the rocking frame (7). A furnace shaft (8) is rotatably installed on the inner wall of the mesh furnace drum (1). The furnace shaft (8) and the rocking frame (7) rotate in opposite directions coaxially. The cradle (7) and the mesh furnace drum (1) are both driven by a reciprocating shaft (6); a sealed furnace seat (9) is mounted on the furnace shaft (8); the sealed furnace seat (9) is rotatably connected to the mesh furnace drum (1); two brush shafts (10) are rotatably mounted on the sealed furnace seat (9); both of the brush shafts (10) are mounted with spiral brush rings (11) for cleaning the oxide layer on the surface of steel; a gear ring (12) is mounted on the mesh furnace drum (1); the tail ends of the two brush shafts (10) are mounted with driven gears (13) meshed with the gear ring (12); and a furnace cover (14) is hingedly connected to the end of the mesh furnace drum (1).

2. The annealing furnace for processing corrosion-resistant steel according to claim 1, characterized in that: The fixed furnace body (2) is provided with two symmetrically arranged burners (15), and the fixed furnace body (2) is provided with a smoke exhaust pipe and a blower respectively connected to the inner cavity of the fixed furnace body (2). The end surface of the movable furnace body (4) is provided with a central control host (16) and a handle respectively.

3. The annealing furnace for processing corrosion-resistant steel according to claim 1, characterized in that: The multi-axis composite motion system comprises a bracket (17) installed in the heat-insulating machine cavity, a horizontal motion frame (18), a servo motor (19) installed on the bracket (17), a circular shaft (20) rotatably connected to the bracket (17), a horizontal screw (21) and an inner flat shaft (22), wherein a notch gear a (23) and a notch gear b (24) are respectively installed on the output shaft of the servo motor (19), and two symmetrically arranged power interruption parts are provided on the output shaft of the servo motor (19) and at positions corresponding to the notch gear a (23) and the notch gear b (24), respectively, and a differential gear a (25) connected to the notch gear a (23) and a differential gear b (26) connected to the notch gear b (24) are respectively installed on the circular shaft (20), and differential bevel gears are installed on both the circular shaft (20) and the inner flat shaft (22), and the two differential bevel gears are meshed with each other. A first chain belt is installed on the inner flat shaft (22), and the two horizontal The screw rods (21) are all connected to the first chain belt transmission, and the two horizontal screw rods (21) are all connected to the horizontal motion frame (18). The horizontal motion frame (18) is respectively rotatably mounted with an outer flat shaft (27), two vertical screw rods (28) and a reciprocating sleeve shaft (29). The outer flat shaft (27) is driven by the inner flat shaft (22). The outer flat shaft (27) and the reciprocating sleeve shaft (29) are both mounted with a guide bevel gear. The two guide bevel gears are meshed with each other. The reciprocating sleeve shaft A second chain belt is installed on the upper transmission (29), and the two vertical screw rods (28) are driven by the second chain belt. The two vertical screw rods (28) are connected to the furnace frame (5) in a transmission manner. The reciprocating shaft (6) is rotatably installed on the furnace frame (5), and the reciprocating shaft (6) is driven by the reciprocating sleeve shaft (29). The rotation connection between the horizontal screw rod (21) and the bracket (17) and the rotation connection between the vertical screw rod (28) and the horizontal motion frame (18) are both provided with a spiral torsion spring (40).

4. The annealing furnace for processing corrosion-resistant steel according to claim 3, characterized in that: The outer flat shaft (27) is fixedly provided with a first hexagonal groove with a tail end opening and slidably connected to the inner flat shaft (22); the reciprocating shaft (6) is fixedly provided with a square shaft segment; the reciprocating sleeve shaft (29) is fixedly provided with a second hexagonal groove with a bottom end opening and slidably connected to the square shaft segment; the cross sections of the first hexagonal groove, the second hexagonal groove, the inner flat shaft (22) and the square shaft segment are all regular hexagons.

5. The annealing furnace for processing corrosion-resistant steel according to claim 3, characterized in that: The central angle corresponding to the tooth portion of the notched gear a (23) is 160°, the central angle corresponding to the tooth portion of the notched gear b (24) is 100°, and the central angle corresponding to the toothless section between the notched gear a (23) and the notched gear b (24) in the circumferential direction is 100°. The module of the notched gear a (23) is 6 to 9 times that of the differential gear a (25), and the module of the notched gear b (24) is 1 to 2.5 times that of the differential gear b (26).

6. The annealing furnace for processing corrosion-resistant steel according to claim 1, characterized in that: Both sides of the cradle (7) are equipped with rocking shafts (30) that are rotatably connected to the furnace frame (5). A bevel gear shaft (31) is rotatably installed between the two rocking shafts (30). A first synchronization shaft (32) and an outer sleeve shaft (33) are rotatably installed on the furnace frame (5). An inner transmission shaft (34) is rotatably installed on the inner wall of the outer sleeve shaft (33). Two fan gears (35) are installed on the outer sleeve shaft (33). A rocking gear (36) is installed on the two rocking shafts (30). The two rocking gears (36) are respectively connected to the two fan gears (35). A linkage gear (4) is installed on the inner transmission shaft (34) and the bevel gear shaft (31). 1), the two linkage gears (41) are meshed with each other, the reciprocating shaft (6) is connected to the first synchronous shaft (32) through a third chain belt, the outer shaft (33) and the inner transmission shaft (34) are both equipped with a first lateral bevel gear, the bottom end of the first synchronous shaft (32) is equipped with a first intermediate bevel gear, the two first lateral bevel gears are both connected to the first intermediate bevel gear, a wheel shaft (37) is rotatably mounted on the cradle (7), the wheel shaft (37) and the bevel gear shaft (31) are both equipped with synchronous bevel gears, the two synchronous bevel gears are meshed with each other, and a fourth chain belt is connected to the wheel shaft (37) and the mesh furnace drum (1) through a transmission connection.

7. The annealing furnace for processing corrosion-resistant steel according to claim 6, characterized in that: The central angle of the circle corresponding to the tooth portion on the sector gear (35) is 45°, the sector gear (35) and the rocking gear (36) have the same radius, and the two first lateral bevel gears are respectively arranged on both sides of the first intermediate bevel gear.

8. The annealing furnace for processing corrosion-resistant steel according to claim 1, characterized in that: A second synchronous shaft (38) is rotatably mounted on the cradle (7), a second intermediate bevel gear is mounted on the second synchronous shaft (38), a second lateral bevel gear is mounted on both the mesh furnace drum (1) and the furnace shaft (8), the two second lateral bevel gears are both transmission-connected to the second intermediate bevel gear, and the two second lateral bevel gears are respectively arranged on both sides of the second intermediate bevel gear.

9. The annealing furnace for processing corrosion-resistant steel according to claim 1, characterized in that: A corrugated heat insulation plate (39) is rotatably mounted on the mesh furnace drum (1), and the corrugated heat insulation plate (39) is welded to the moving furnace body (4) as a whole. The corrugated heat insulation plate (39) is a double-layer stainless steel corrugated plate, with a ceramic fiber insulation layer filled in the middle, the thickness of which is 10 mm to 15 mm, and a high-temperature resistant alumina coating is sprayed on the surface. The spiral brush ring (11) is made of Hastelloy alloy, and the spiral directions of the two spiral brush rings (11) are opposite. The mesh furnace drum (1) is made of stainless steel.

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