Stress relief annealing device for cold-rolled stainless steel band for diaphragm spring

Abstract

The invention discloses a stress relief annealing device for cold-rolled stainless steel bands for diaphragm springs, and belongs to the technical field of cold-rolled stainless steel band annealing. Steel bands stacked above are driven by a material table to revolve by taking a rotary table as the center, so that the steel bands can move in an inner cover type furnace shell; the deflection gears drive the material tables and the steel belt above to rotate through the rotating shafts, so that the outer wall of the steel belt can be evenly heated, meanwhile, the fan blades extract gas below, the gas rises among the multiple material tables, and the gas can be dispersed all around and makes contact with the top of the steel belt; and the upper gas penetrates through gaps between the steel strips and the gas guide box and enters the fixed box again, so that the aim of circularly guiding the protective gas hydrogen in the inner bell-type furnace shell is fulfilled, the hydrogen can be in full contact with the steel strips in a stacked state, the hydrogen with high thermal conductivity permeates into the steel strip layers, the heat transfer efficiency is remarkably improved, and the service life of the furnace is prolonged. Therefore, the annealing effect on the steel strip is improved, and the mechanical property of the steel strip is more uniform and consistent.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of annealing of cold-rolled stainless steel strips, and particularly relates to a stress relief annealing device for cold-rolled stainless steel strips for diaphragm springs. BACKGROUND

[0002] Clutch diaphragm springs, valve diaphragms and the like are key elastic elements in precision machinery, and need to have high fatigue life, stable elasticity and corrosion resistance. Cold-rolled stainless steel strips are the first choice of materials due to their excellent strength, toughness and corrosion resistance. However, the cold rolling process can cause residual stress in the material, affecting the dimensional stability and mechanical properties of the spring, so stress relief annealing is needed to eliminate stress. In the annealing process of the rolled stainless steel strip, the coiled steel strip is stacked in the annealing furnace, and the annealing stability and effect of the stainless steel strip are improved by adding a protective gas to the annealing furnace. However, the poor flowability of the protective gas in the annealing furnace makes it difficult for the protective gas to effectively penetrate the gaps between the steel strips, affecting the annealing effect. Moreover, the heat generated inside the annealing furnace during work is concentrated in a certain area, and the stainless steel strip is prone to uneven heating due to the static state of the stacked steel strip. SUMMARY

[0003] In order to overcome the above-mentioned defects, the application provides a stress relief annealing device for cold-rolled stainless steel strips for diaphragm springs, which solves the problem of improving the annealing stability and effect of the stainless steel strip by adding a protective gas to the annealing furnace, due to the poor flowability of the protective gas in the annealing furnace, making it difficult for the protective gas to effectively penetrate the gaps between the steel strips, affecting the annealing effect, and the heat generated inside the annealing furnace during work is concentrated in a certain area, and the stainless steel strip is prone to uneven heating due to the static state of the stacked steel strip.

[0004] In order to achieve the above object, the present application provides the following technical scheme: a cold-rolled stainless steel strip stress relief annealing device for diaphragm spring, comprising a furnace base, a refractory furnace table is fixedly connected to the furnace base, an outer cover type furnace shell is arranged outside the refractory furnace table, the bottom of the outer cover type furnace shell is clamped on the furnace base, fuel chambers are fixedly installed on the two sides of the outer cover type furnace shell respectively, a burner is installed on the bottom of the fuel chamber, one end of the burner is penetrated and installed in the outer cover type furnace shell and extends to the inside of the outer cover type furnace shell, an inner cover type furnace shell is arranged in the inside of the outer cover type furnace shell, a plurality of heat conduction grooves are arranged in the inner wall and the outer wall of the inner cover type furnace shell respectively, the bottom of the inner cover type furnace shell is clamped at the edge of the outer wall of the refractory furnace, the bottom of the outer cover type furnace shell is clamped at the edge of the bottom of the inner cover type furnace shell, a support bearing is fixedly arranged at the opening of the top of the refractory furnace table, a rotary table is sleeved in the inside of the support bearing, a gear ring is arranged below the rotary table, the gear ring is fixedly connected to the inner wall of the refractory furnace table, four material supporting assemblies are equidistantly engaged and connected in the gear ring, the material supporting assemblies are penetrated and installed in the rotary table, a center seat is fixedly connected to the side of the four material supporting assemblies close to each other, an air ventilation assembly is fixedly connected to the middle part of the center seat, the air ventilation assembly is penetrated and installed in the middle part of the rotary table, the bottom of the air ventilation assembly penetrates the refractory furnace table and the furnace base and is connected with a driving assembly, a protection cylinder is fixedly connected to the bottom of the driving assembly, the top of the protection cylinder is fixed to the bottom of the furnace base, a plurality of heat dissipation holes are arranged outside the protection cylinder, the top end of the air ventilation assembly penetrates the rotary table and is provided with a plurality of fan blades, a fixed box is arranged outside the plurality of fan blades, the bottom of the fixed box is fixedly connected to the middle part of the rotary table, a plurality of air guide holes are arranged outside the fixed box.

[0005] As a further scheme of the present application: cooling fans are penetrated and installed above the two sides of the outer cover type furnace shell, four lifting rings are equidistantly fixed to the top of the outer cover type furnace shell, support legs are fixedly connected to the four corners of the bottom of the furnace base, a spray cooling mechanism is penetrated and installed at the center of the top of the outer cover type furnace shell, and a discharge valve is installed below the outer side of the outer cover type furnace shell.

[0006] As a further scheme of the present application: the material supporting assembly comprises a material table, a gas guide box is overlapped on the material table, a plurality of air holes are arranged on the upper and lower sides and the outer side of the gas guide box, a rotating shaft is fixedly connected to the bottom of the gas guide box, and the rotating shaft is rotatably connected to the rotary table through a shaft sleeve.

[0007] As a further scheme of the present application: the bottom end of the rotating shaft penetrates the rotary table and is fixedly connected with a support plate, one end of the support plate is fixed to the outer side of the center seat, a deflection gear is rotatably connected to the end of the support plate away from the center seat through a shaft sleeve, and the deflection gear is engaged with the gear ring.

[0008] As a further scheme of the present application, the ventilation assembly comprises a central bearing clamped in the middle of the fireproof table and the base, a fixed shaft sleeved in the central bearing, the top end of the fixed shaft being fixed with the bottom of the rotating table, the central seat being fixed above the outer wall of the fixed shaft, an inner bearing being fixed in the fixed shaft, a hollow shaft being sleeved in the inner bearing, and a plurality of fan blades being fixed above the outer wall of the hollow shaft.

[0009] As a further scheme of the present application, the bottom of the hollow shaft is connected with a rotary joint, the bottom of the rotary joint is provided with an electromagnetic valve, the bottom of the electromagnetic valve is provided with a hydrogen pipe, and the hydrogen pipe is fixed in the bottom of the protection cylinder.

[0010] As a further scheme of the present application, the bottom end of the fixed shaft is fixedly connected with a driven gear one, a driven gear two is arranged below the driven gear one, the driven gear one and the driven gear two are meshingly connected with the driving assembly, and the diameter of the driven gear one is greater than that of the driven gear two.

[0011] As a further scheme of the present application, the driving assembly comprises a motor fixedly connected with the inner wall of the protection cylinder, a driving gear one and a driving gear two fixedly connected with the output shaft of the motor, the driving gear one being meshingly connected with the driven gear one, the driving gear two being meshingly connected with the driven gear two, and the diameter of the driving gear two being much greater than that of the driven gear two.

[0012] Compared with the prior art, the present application has the following beneficial effects: 1. In this invention, the driven gear drives the fixed shaft to rotate. The fixed shaft drives the four support plates and the deflection gears to rotate via the central seat, and simultaneously drives the turntable to rotate. The fixed shaft is limited by the central bearing, improving the stability of the fixed shaft driving the turntable to rotate. The support plates drive the turntable to rotate inside the support bearing via the rotating shaft. The support bearing limits the turntable, thereby improving the stability of the turntable driving the rotation of multiple material support components. At the same time, the rotating shaft drives the stacked steel strip above to revolve around the turntable, allowing the steel strip to move within the inner furnace shell. During the rotation of the deflection gears driven by the support plates, since all four deflection gears are engaged with the gear ring and the gear ring is stationary, the deflection gears drive the material platform and the steel strip above to rotate via the rotating shaft. Therefore, the steel strip rotates while moving at the inner edge of the inner furnace shell, ensuring that the outer wall of the steel strip is evenly subjected to the rotation. The system prevents heat from concentrating in a single area, which would affect the annealing effect on the steel strip. Simultaneously, the fan draws in gas from below, causing it to rise between multiple platforms. When the gas reaches the top of the inner furnace shell, it disperses and contacts the top of the steel strip. The air guide holes outside the fixed box draw in the surrounding gas, and suction is generated at the air vents outside the air guide box. The gas above exits through the air vents at the top of the air guide box and from the side air vents. Simultaneously, the gas above penetrates the gaps between the steel strips and the air guide box, re-entering the fixed box. This achieves the purpose of circulating and guiding the protective hydrogen gas within the inner furnace shell. By increasing the fluidity of hydrogen within the inner furnace shell, it allows for sufficient contact between the hydrogen and the stacked steel strips. The highly thermally conductive hydrogen penetrates between the steel strip layers, significantly improving heat transfer efficiency and thus enhancing the annealing effect on the steel strip, resulting in more uniform and consistent mechanical properties. 2. In this invention, by placing the rolled steel strip on the venting box in the material support assembly, the steel strip can be supported, thereby improving the permeability between the top and bottom of the steel strip. When stacking steel strips, another venting box is placed on top of the lower steel strip, and the steel strip to be placed is stacked on the uppermost venting box. Therefore, the conductivity between multiple steel strips in the vertical direction is not affected. Similarly, the remaining rolled steel strips are stacked on other material support assemblies to ensure that the forces on each area of ​​the turntable top are balanced. The hydrogen supply pipe in the venting assembly is connected to an external hydrogen supply device, and the solenoid valve is opened to allow the protective gas hydrogen to pass through the hydrogen supply pipe and the solenoid valve. The hydrogen gas enters the hollow shaft and then guides it into the inner furnace shell, allowing it to contact the steel strip inside. The bottom of the hollow shaft is connected to the hydrogen supply pipe via a rotary joint, ensuring continuous communication between the hydrogen supply pipe and the hollow shaft while the shaft rotates, preventing the hydrogen supply pipe and solenoid valve from rotating. When the burner is operating, the inner furnace shell is heated by an open flame. Several heat-conducting grooves on the outside and inside of the inner furnace shell increase its heat transfer area and transfer heat to the interior, improving heat transfer efficiency and the overall efficiency of the steel strip heat treatment. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the outer casing furnace shell of the present invention; Figure 3 This is a schematic diagram of the cross-sectional structure of the inner-shell furnace shell of the present invention; Figure 4 This is a schematic diagram of the cross-section of the refractory furnace platform of the present invention; Figure 5 This is a schematic diagram of the connection between the ventilation component and the drive component of the present invention; Figure 6 This is a schematic diagram of a partial cross-section of the material support assembly of the present invention; Figure 7 This is a schematic diagram of a partial cross-section of the turntable of the present invention; Figure 8 This is a schematic diagram of the connection between the refractory furnace platform and the gear ring of the present invention; In the diagram: 1. Furnace base; 2. Refractory furnace platform; 3. Outer furnace shell; 4. Fuel chamber; 5. Burner; 6. Cooling fan; 7. Lifting ring; 8. Support leg; 9. Spray cooling mechanism; 10. Inner furnace shell; 11. Heat conduction groove; 12. Support bearing; 13. Turntable; 14. Gear ring; 15. Material support assembly; 151. Material platform; 152. Air guide box; 153. Air hole; 154. Rotating shaft; 155. Support plate; 156. Deflection gear; 16. Center seat; 17. Protective sleeve; 18. Heat dissipation hole; 19. Ventilation assembly; 191. Central bearing; 192. Fixed shaft; 193. Inner bearing; 194. Hollow shaft; 195. Rotary joint; 196. Solenoid valve; 197. Hydrogen inlet pipe; 198. Driven gear one; 199. Driven gear two; 20. Fan blade; 21. Drive assembly; 211. Motor; 212. Driven gear two; 213. Driven gear one; 22. Fixing box; 23. Air guide hole; 24. Discharge valve. Detailed Implementation

[0014] The technical solution of this application will be further described in detail below with reference to specific embodiments.

[0015] like Figures 1-8As shown, the present application provides a technical scheme: a cold-rolled stainless steel strip stress relief annealing device for diaphragm spring, including furnace base 1, the furnace base 1 is fixedly connected with refractory furnace table 2, the outer surface of refractory furnace table 2 is provided with outer cover type furnace shell 3, the bottom of outer cover type furnace shell 3 is clamped on the furnace base 1, the upper part of the both sides of outer cover type furnace shell 3 is penetrated and installed with cooling fan 6, the top of outer cover type furnace shell 3 is fixed with four lifting rings 7 at equal intervals, the four corners of the bottom of furnace base 1 are fixedly connected with supporting legs 8 respectively, the center of the top of outer cover type furnace shell 3 is penetrated and installed with spray cooling mechanism 9, the lower part of the outer side of outer cover type furnace shell 3 is installed with discharge valve 24. Open the discharge valve 24 below the one side of outer cover type furnace shell 3, control the working of cooling fan 6 and spray cooling mechanism 9, the spray cooling mechanism 9 sprays water to the inner cover type furnace shell 10 to take away heat, the water is discharged through the discharge valve 24, cooperate with the working of cooling fan 6, which can effectively take away the heat inside the outer cover type furnace shell 3.

[0016] The both sides of outer cover type furnace shell 3 are fixedly installed with fuel chamber 4, the bottom of fuel chamber 4 is installed with burner 5, one end of burner 5 is penetrated and installed in outer cover type furnace shell 3 and extends to the inside of outer cover type furnace shell 3; the inside of outer cover type furnace shell 3 is provided with inner cover type furnace shell 10, the inner wall and the outer wall of inner cover type furnace shell 10 are respectively provided with a plurality of heat conduction grooves 11. Burner 5 ignites the natural gas input by fuel chamber 4, heats inner cover type furnace shell 10 by open flame, because the outside and the inside of inner cover type furnace shell 10 are provided with a plurality of heat conduction grooves 11, which increases the heat transfer area of inner cover type furnace shell 10 and transfers heat to the inside, improves the heat transfer effect.

[0017] The bottom of inner cover type furnace shell 10 is clamped at the edge of the outer wall of refractory furnace, the bottom of outer cover type furnace shell 3 is clamped at the edge of the bottom of inner cover type furnace shell 10, the opening at the top of refractory furnace table 2 is fixed with support bearing 12, support bearing 12 is sleeved with turntable 13 inside, which limits the turntable 13 through support bearing 12; the lower part of turntable 13 is provided with gear ring 14, gear ring 14 is fixedly connected with the inner wall of refractory furnace table 2, four material supporting assemblies 15 are engaged and connected at equal intervals in gear ring 14, material supporting assemblies 15 are penetrated and installed in turntable 13, the side of four material supporting assemblies 15 close to each other is fixedly connected with center seat 16.

[0018] The supporting assembly 15 comprises a supporting table 151, a gas guiding box 152 is overlapped on the top surface of the supporting table 151, a plurality of air holes 153 are arranged on the upper and lower sides and the outer side of the gas guiding box 152, the bottom of the supporting table 151 is fixedly connected with a rotating shaft 154, the rotating shaft 154 is rotatably connected with the rotating table 13 through a shaft sleeve, the rolled steel belt is placed on the gas guiding box 152 in the supporting assembly 15, the steel belt can be erected, and the permeability of the top and bottom of the steel belt is improved; when the steel belts are stacked and placed, another gas guiding box 152 is erected on the top of the lower steel belt, and the steel belt to be placed is stacked on the uppermost gas guiding box 152, so that the permeability between the steel belts in the vertical direction is not affected.

[0019] The bottom end of the rotating shaft 154 penetrates the rotating table 13 and is fixedly connected with a supporting plate 155, one end of the four supporting plates 155 is fixedly connected with the outer side of the central seat 16, the end of the supporting plate 155 away from the central seat 16 is rotatably connected with a deflection gear 156 through a shaft sleeve, the deflection gear 156 is meshed with the gear ring 14, since the four deflection gears 156 are meshed and connected with the gear ring 14 and the gear ring 14 is in a stationary state, the deflection gear 156 drives the supporting table 151 and the upper steel belt to rotate by the rotating shaft 154, so as to adjust the angle of the steel belt.

[0020] The central seat 16 is fixedly connected with a ventilation assembly 19, the ventilation assembly 19 penetrates and is installed in the middle of the rotating table 13, the ventilation assembly 19 comprises a central bearing 191, the central bearing 191 is clamped in the middle of the fireproof furnace table 2 and the furnace base 1, a fixed shaft 192 is sleeved in the central bearing 191, the top end of the fixed shaft 192 is fixed with the bottom of the rotating table 13, the central seat 16 is fixed above the outer wall of the fixed shaft 192, the inner part of the fixed shaft 192 penetrates and is fixedly connected with an inner bearing 193, the inner bearing 193 is sleeved with a hollow shaft 194, a plurality of fan blades 20 are fixed above the outer wall of the hollow shaft 194; the fixed shaft 192 drives the four supporting plates 155 to rotate and the deflection gear 156 to rotate through the central seat 16, and synchronously drives the rotating table 13 to rotate, the fixed shaft 192 is limited by the central bearing 191, the stability of the rotating table 13 driven by the fixed shaft 192 to rotate is improved; the hollow shaft 194 is supported and limited by the inner bearing 193, and the stability of the plurality of fan blades 20 on the top driven by the hollow shaft 194 to rotate is improved.

[0021] The bottom of the hollow shaft 194 is connected and installed with a rotary joint 195, the bottom of the rotary joint 195 is installed with a solenoid valve 196, the bottom of the solenoid valve 196 is installed with a hydrogen pipe 197, the hydrogen pipe 197 penetrates and is fixedly connected with the bottom of the protective cylinder 17, the bottom of the hollow shaft 194 is connected with the hydrogen pipe 197 through the rotary joint 195, so that the hydrogen pipe 197 and the solenoid valve 196 do not rotate in the rotating process of the hollow shaft 194, and the continuous communication between the hydrogen pipe 197 and the hollow shaft 194 is ensured.

[0022] The bottom of the ventilation component 19 passes through the refractory furnace platform 2 and the furnace base 1 and is connected to the drive component 21. The bottom of the drive component 21 is fixedly connected to the protective cylinder 17. The top of the protective cylinder 17 is fixed to the bottom of the furnace base 1. Several heat dissipation holes 18 are opened on the outside of the protective cylinder 17. The top of the ventilation component 19 passes through the turntable 13 and is provided with several fan blades 20. The fan blades 20 are provided with a fixing box 22. The bottom of the fixing box 22 is fixedly connected to the middle of the turntable 13. Several air guide holes 23 are opened on the outside of the fixing box 22.

[0023] A driven gear 198 is fixedly connected to the bottom end of the fixed shaft 192. A driven gear 299 is located below the driven gear 198. The driven gears 198 and 299 are meshed with the drive assembly 21. The diameter of the driven gear 198 is larger than the diameter of the driven gear 299. The drive assembly 21 includes a motor 211, which is fixedly connected to the bottom of the inner wall of the protective cylinder 17. A drive gear 213 and a drive gear 212 are fixedly connected to the output shaft of the motor 211. The drive gear 213 meshes with the driven gear 198, and the drive gear 212 meshes with the driven gear 299. The meshing connection is such that the diameter of the driving gear 212 is much larger than the diameter of the driven gear 199. During the process of the hollow shaft 194 driving the multiple fan blades 20 to rotate, the rotation speed of the hollow shaft 194 is greater than that of the turntable 13, which allows it to draw gas from below the fan blades 20, causing the gas to rise between the multiple material platforms 151. When the gas rises to the top inside the inner furnace shell 10, the gas will spread out to the surroundings and contact the top of the steel strip. By increasing the fluidity of hydrogen in the inner furnace shell 10, the hydrogen can fully contact the stacked steel strip. The highly thermally conductive hydrogen penetrates into the interlayer of the steel strip, improving the heat transfer efficiency.

[0024] The working principle of this invention is as follows: During stress-relief annealing of cold-rolled stainless steel strip, the outer furnace shell 3 is lifted by hooking the lifting ring 7 on the outer shell 3 using a lifting device. Then, the inner furnace shell 10 is removed, exposing the refractory furnace platform 2 and the internal turntable 13. The rolled steel strip is placed on the gas guide box 152 in the material support assembly 15, which supports the steel strip and improves the permeability between the top and bottom of the strip. When stacking steel strips, another gas guide box 152 is placed on top of the lower steel strip, and the steel strips to be placed are stacked on the uppermost gas guide box 152, thus not affecting multiple vertical directions. Similarly, the remaining rolled steel strips are stacked on other material support components 15 to ensure that the forces on each area of ​​the top of the turntable 13 are balanced. After the steel strip placement is completed, the inner furnace shell 10 is placed over the outside of the steel strip, so that the bottom of the inner furnace shell 10 is inserted into the outside of the refractory furnace platform 2 and contacts the furnace base 1. Then, the outer furnace shell 3 is lifted by the lifting equipment and placed over the outside of the inner furnace shell 10, so that the bottom of the outer furnace shell 3 is engaged with the edge of the bottom of the inner furnace shell 10 and contacts the edge of the furnace base 1. Next, the hydrogen supply pipe 197 in the ventilation assembly 19 is connected to the external hydrogen supply equipment, and the solenoid valve 196 is opened, so that the protective gas hydrogen enters the hollow shaft 194 through the hydrogen supply pipe 197 and the solenoid valve 196. The hollow shaft 194 then introduces the hydrogen into the inner cover furnace shell 10, so that the hydrogen can contact the steel strip in the inner cover furnace shell 10. After the gas filling step is completed, the solenoid valve 196 is closed, so that the inner cover furnace shell 10 is in a closed space. Then, the burners 5 on both sides are controlled to work, so that the burners 5 ignite the natural gas input into the fuel chamber 4, and heat the inner cover furnace shell 10 by open flame. Since the inner cover furnace shell 10 is provided with several heat conduction grooves 11 on the outside and inside, the heat transfer area of ​​the inner cover furnace shell 10 is increased and the heat is transferred to the inside, improving the heat transfer effect. The heat inside the inner cover furnace shell 10 can perform stress-relieving annealing treatment on the steel strip. During the heating process of the steel strip, the control motor 211 operates to drive the first drive gear 213 and the second drive gear 212 to rotate. The first drive gear 213, in turn, drives the fixed shaft 192 to rotate via the driven gear 198. The fixed shaft 192, through the center seat 16, drives the four support plates 155 to rotate and the deflection gear 156 to rotate, simultaneously driving the turntable 13 to rotate. The fixed shaft 192 is limited by the center bearing 191, improving the stability of the rotation of the turntable 13 driven by the fixed shaft 192. The support plates 155 drive the turntable 13 to rotate inside the support bearing 12 via the rotating shaft 154. The support bearing 12 limits the rotation of the turntable 13, thereby improving the stability of the rotation of the turntable 13. The stability of the rotation of multiple material support components 15 is ensured. At the same time, the rotating shaft 154 drives the stacked steel strip above to revolve around the turntable 13 through the material platform 151, so that the steel strip can move in the inner furnace shell 10. When the support plate 155 drives the deflection gear 156 to rotate, since all four deflection gears 156 are meshed with the gear ring 14 and the gear ring 14 is in a stationary state, the deflection gear 156 drives the material platform 151 and the steel strip above to rotate through the rotating shaft 154. Therefore, the steel strip rotates while moving at the inner edge of the inner furnace shell 10, so that the outer wall of the steel strip can be heated evenly and prevent heat from being concentrated in a single area, which would affect the annealing effect on the steel strip. During the movement of the steel belt, the driving gear 212 drives the driven gear 299 to rotate. Since the diameter of the driving gear 212 is much larger than the diameter of the driven gear 299, the rotational speed of the driven gear 299 is greater than that of the driving gear 212. The driven gear 299 then drives the hollow shaft 194 to rotate within the inner bearing 193. The inner bearing 193 supports and limits the hollow shaft 194, thereby improving the stability of the hollow shaft 194 driving the rotation of the multiple fan blades 20 at the top. Furthermore, the bottom of the hollow shaft 194 is connected to the hydrogen supply pipe 197 via a rotary joint 195, ensuring that the hydrogen supply pipe 197 and the solenoid valve 196 do not rotate during the rotation of the hollow shaft 194, thus maintaining continuous communication between the hydrogen supply pipe 197 and the hollow shaft 194. During the rotation of the multiple fan blades 20, the hollow shaft 194's rotational speed is greater than that of the driving gear 212. The rotational speed of platform 13 allows it to draw gas from below fan blade 20, causing the gas to rise between multiple platforms 151. When the gas rises to the top inside the inner furnace shell 10, it spreads outwards and contacts the top of the steel strip. Since fan blade 20 draws gas from inside fixed box 22, the air guide holes 23 outside fixed box 22 draw in the surrounding gas. During this process, suction is generated at the air holes 153 outside air guide box 152. The gas above will pass through the air holes 153 at the top of air guide box 152 and be discharged from the side air holes 153. At the same time, the gas above penetrates the gaps between the steel strips and air guide box 152 and re-enters fixed box 22. Thus, the purpose of circulating and guiding the protective gas hydrogen in inner furnace shell 10 is achieved. By improving the fluidity of hydrogen in inner furnace shell 10, hydrogen can fully contact the stacked steel strips. After the heating of the steel strip is stopped, the steel strip is kept warm and then slowly cooled. The discharge valve 24 on one side of the outer furnace shell 3 is opened, and the cooling fan 6 and the spray cooling mechanism 9 are controlled to work. The spray cooling mechanism 9 sprays water onto the inner furnace shell 10 to remove heat. The water will be discharged through the discharge valve 24. With the work of the cooling fan 6, the heat inside the outer furnace shell 3 can be effectively removed. Then, the outer furnace shell 3 is lifted by the lifting equipment, and the inner furnace shell 10 is removed to take out the annealed steel strip.

[0025] In the description of this invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A stress-relief annealing apparatus for cold-rolled stainless steel strip for diaphragm springs, comprising a furnace base (1), characterized in that: A refractory furnace platform (2) is fixedly connected to the furnace base (1). An outer furnace shell (3) is provided on the outside of the refractory furnace platform (2). The bottom of the outer furnace shell (3) is snapped onto the furnace base (1). Fuel chambers (4) are fixedly installed on both sides of the outer furnace shell (3). A burner (5) is installed at the bottom of the fuel chamber (4). One end of the burner (5) is installed through the outer furnace shell (3) and extends into the interior of the outer furnace shell (3). An inner furnace shell (3) is provided inside the outer furnace shell (3). 10), the inner wall and outer wall of the inner-cover furnace shell (10) are respectively provided with a number of heat conduction grooves (11). The bottom of the inner-cover furnace shell (10) is snapped at the edge of the outer wall of the refractory furnace. The bottom of the outer-cover furnace shell (3) is snapped at the edge of the bottom of the inner-cover furnace shell (10). A support bearing (12) is fixed at the opening at the top of the refractory furnace platform (2). A turntable (13) is sleeved inside the support bearing (12). A gear ring (14) is provided below the turntable (13). The gear ring (14) is fixedly connected to the refractory furnace. On the inner wall of the platform (2), four material support components (15) are connected at equal intervals in the toothed ring (14). The material support components (15) are installed through the turntable (13). A center seat (16) is fixedly connected to one side of the four material support components (15) that are close to each other. A ventilation component (19) is fixedly connected to the middle of the center seat (16). The ventilation component (19) is installed through the middle of the turntable (13). The bottom of the ventilation component (19) penetrates the refractory furnace platform (2) and the furnace base (1) and is connected to a drive component (21). The bottom of the drive assembly (21) is fixedly connected to a protective cylinder (17). The top of the protective cylinder (17) is fixed to the bottom of the furnace base (1). The protective cylinder (17) has several heat dissipation holes (18) on its outside. The top of the ventilation assembly (19) passes through the turntable (13) and has several fan blades (20). The fan blades (20) have a fixed box (22) on their outside. The bottom of the fixed box (22) is fixedly connected to the middle of the turntable (13). The fixed box (22) has several air guide holes (23) on its outside.

2. The stress-relieving annealing apparatus for cold-rolled stainless steel strip for diaphragm springs according to claim 1, characterized in that: Cooling fans (6) are installed through the upper sides of the outer casing (3). Four hanging rings (7) are fixed at equal intervals on the top of the outer casing (3). Support legs (8) are fixedly connected to the four corners of the bottom of the furnace base (1). A spray cooling mechanism (9) is installed through the center of the top of the outer casing (3). A discharge valve (24) is installed on the lower side of the outer casing (3).

3. The stress-relieving annealing apparatus for cold-rolled stainless steel strip for diaphragm springs according to claim 1, characterized in that: The material support assembly (15) includes a material platform (151), on which an air guide box (152) is attached. The air guide box (152) has several air holes (153) on its upper and lower sides and outer side. A rotating shaft (154) is fixed at the bottom of the air guide box (152), and the rotating shaft (154) is rotatably connected to the turntable (13) through a bushing.

4. The stress-relieving annealing apparatus for cold-rolled stainless steel strip for diaphragm springs according to claim 3, characterized in that: The bottom end of the rotating shaft (154) passes through the turntable (13) and is fixedly connected to a support plate (155). One end of the support plate (155) is fixed to the outside of the center seat (16). The end of the support plate (155) away from the center seat (16) is rotatably connected to a deflection gear (156) through a bushing. The deflection gear (156) meshes with the gear ring (14).

5. The stress-relieving annealing apparatus for cold-rolled stainless steel strip for diaphragm springs according to claim 1, characterized in that: The ventilation assembly (19) includes a central bearing (191), which is snapped into the middle of the refractory furnace platform (2) and the furnace base (1). A fixed shaft (192) is sleeved inside the central bearing (191). The top end of the fixed shaft (192) is fixed to the bottom of the turntable (13). The central seat (16) is fixed above the outer wall of the fixed shaft (192). An inner bearing (193) is fixed through the inside of the fixed shaft (192). A hollow shaft (194) is sleeved in the inner bearing (193). Several fan blades (20) are fixed above the outer wall of the hollow shaft (194).

6. The stress-relieving annealing apparatus for cold-rolled stainless steel strip for diaphragm springs according to claim 5, characterized in that: A rotary joint (195) is connected to the bottom of the hollow shaft (194), a solenoid valve (196) is installed at the bottom of the rotary joint (195), a hydrogen supply pipe (197) is installed at the bottom of the solenoid valve (196), and the hydrogen supply pipe (197) is fixed through the bottom of the protective cylinder (17).

7. The stress-relieving annealing apparatus for cold-rolled stainless steel strip for diaphragm springs according to claim 6, characterized in that: A driven gear one (198) is fixedly connected to the bottom end of the fixed shaft (192). A driven gear two (199) is provided below the driven gear one (198). The driven gear one (198) and the driven gear two (199) are meshed with the drive assembly (21). The diameter of the driven gear one (198) is larger than the diameter of the driven gear two (199).

8. The stress-relieving annealing apparatus for cold-rolled stainless steel strip for diaphragm springs according to claim 7, characterized in that: The drive assembly (21) includes a motor (211), which is fixedly connected to the bottom of the inner wall of the protective cylinder (17). A first drive gear (213) and a second drive gear (212) are fixedly connected to the output shaft of the motor (211). The first drive gear (213) meshes with the first driven gear (198), and the second drive gear (212) meshes with the second driven gear (199). The diameter of the second drive gear (212) is much larger than the diameter of the second driven gear (199).

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