In-furnace annealing method for precise stainless steel strip

Abstract

The invention discloses an in-furnace annealing method of a precision stainless steel strip, and relates to the technical field of stainless steel strip heat treatment, the in-furnace annealing method of the precision stainless steel strip applies a vacuum annealing furnace, the vacuum annealing furnace comprises a furnace body, and a vacuum pump is arranged on the side face of the furnace body; an external trolley assembly is arranged at the bottom of the furnace body, an inner cavity is formed in the supporting pedestal, the side face of one end of the inner cavity is connected with a first pump body through a first oil liquid pipe, and the side face of the other end of the inner cavity is connected with a second pump body through a second oil liquid pipe. According to the in-furnace annealing method for the precise stainless steel strip, only the material carrying rod, the penetrating rod and the disc are located in the furnace body during annealing treatment, oil liquid needed for stretching out of the penetrating rod is in a flowing state, and therefore the problem that oil liquid of a hydraulic trolley is prone to deterioration after being heated for a long time is solved, meanwhile, the stainless steel strip moves synchronously along with the furnace door, and the service life of the stainless steel strip is prolonged. And the stainless steel strip can be quickly taken out after annealing treatment.

Description

Technical Field

[0001] The present invention relates to the technical field of heat treatment of stainless steel strips, and specifically to an in-furnace annealing method for precision stainless steel strips. Background Art

[0002] During the production of precision stainless steel strips, the stainless steel strips are placed in a vacuum annealing furnace. After closing the furnace door, the vacuum pump is started to pump the pressure inside the furnace to a certain vacuum degree, generally reaching - Pa. Then heating is carried out, and the heating temperature is selected within the range of 700 - 1100 °C according to the type and performance requirements of the stainless steel. After holding for a period of time, cooling is carried out, and the in-furnace vacuum state can be maintained during the cooling process by means of furnace cooling or rapid cooling.

[0003] When the existing vacuum annealing furnace anneals stainless steel strips, the stainless steel strips are usually placed on a trolley so that the trolley can carry the strips out of the furnace after annealing. However, the trolley is located inside the furnace and is heated together with the stainless steel strips, which makes the components such as the circuits, motors, and electronic components inside the electric trolley prone to aging, overheating, and malfunction. For the trolley driven by hydraulic pressure, long-term heating easily causes the oil to deteriorate, the viscosity to decrease, or the sealing performance to decrease. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides an in-furnace annealing method for precision stainless steel strips, which solves the problems raised in the above background art.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: An in-furnace annealing method for precision stainless steel strips, the in-furnace annealing method for precision stainless steel strips includes the following steps: Step 1: The stainless steel strips to be annealed are sleeved on the surface of the loading rod in a coiled shape; Step 2: The solenoid valve is opened, and the first pump body injects oil into the inner cavity outside the furnace body. The oil sequentially passes through the solenoid valve, the hollow telescopic rod, and the third pump body and then enters the inside of the loading rod to push the piercing rod to extend outward to firmly clamp the stainless steel strips from the inside to the outside, and the oil is circulated; Step 3: The second pump body injects oil into the inner cavity outside the furnace body, so that the piston end drives the hollow telescopic rod to retract into the inner cavity, thereby closing the furnace door and the furnace body. At this time, only the loading rod, the piercing rod, and the disc are located inside the furnace body; Step 4: The vacuum pump is started to evacuate the furnace body to a vacuum, and then the temperature inside the furnace body is raised to perform annealing operations on the stainless steel strips; Step 5: During the annealing process, the drive motor located outside the furnace door drives the drive gear to make the internal gear ring drive the loading rod to rotate, so that the stainless steel strips rotate and are evenly heated; Step 6: After annealing is completed, the first pump body injects the oil fluid into the inner cavity. At this time, the solenoid valve is closed, so that the hollow telescopic rod carries the furnace door and moves outward. While the furnace door moves outward, it carries the annealed stainless steel strip out of the furnace body. Finally, the solenoid valve is opened, and the third pump body discharges the oil fluid inside the loading rod into the inner cavity, so that the threading rod releases the clamping of the stainless steel strip.

[0006] Further, the in-furnace annealing method for the precision stainless steel strip is applied to a vacuum annealing furnace. The vacuum annealing furnace includes a furnace body. A vacuum pump is arranged on the side of the furnace body, and an external trolley assembly is arranged at the bottom of the furnace body.

[0007] Further, the external trolley assembly includes a support pedestal, an inner cavity, a first oil pipe, a second oil pipe, a first pump body and a second pump body. An inner cavity is opened inside the support pedestal, and one side surface of one end of the inner cavity is connected with the first pump body through the first oil pipe, and the other side surface of the other end of the inner cavity is connected with the second pump body through the second oil pipe.

[0008] Further, the external trolley assembly further includes a piston end, a solenoid valve and a hollow telescopic rod. The piston end is arranged inside the inner cavity, and the solenoid valve is embedded inside the piston end. The end surface of the piston end is fixed with the hollow telescopic rod.

[0009] Further, the external trolley assembly further includes a furnace door and support wheels. One end of the hollow telescopic rod away from the piston end is fixed with the furnace door, and support wheels are arranged on both sides of the bottom of the furnace door.

[0010] Further, the external trolley assembly further includes a disc, a loading rod and a threading rod. A disc is rotatably connected to one side of the furnace door close to the furnace body, and a loading rod is fixed on the side surface of the disc. The threading rods are evenly arranged on the outer wall of the loading rod in an annular shape.

[0011] Further, the external trolley assembly further includes a pipe bearing, a connecting pipe and a third pump body. A connecting pipe is rotatably connected to the middle of one side of the disc close to the furnace door through the pipe bearing, and a third pump body is connected to the bottom of the connecting pipe.

[0012] Further, the bottom of the third pump body is connected to one end of the hollow telescopic rod away from the piston end, and the loading rod is communicated with the hollow telescopic rod through the connecting pipe and the third pump body.

[0013] Further, an internal gear ring is arranged at the edge of one side of the disc close to the furnace door, and a strip rotating assembly is arranged inside the internal gear ring.

[0014] Further, the strip rotating assembly includes a driving gear and a driving motor. The driving gear is meshed with the internal gear ring, and the driving motor is connected to the surface of the driving gear.

[0015] The present invention provides a method for in-furnace annealing of precision stainless steel strips, which has the following beneficial effects: 1. In the method for in-furnace annealing of precision stainless steel strips, only the loading rod, the threading rod, and the disc are located inside the furnace body during the annealing process, and the oil required for the threading rod to extend is in a flowing state, thus eliminating the problem that the oil of the hydraulic trolley is prone to deterioration due to long-term heating. At the same time, the stainless steel strip moves synchronously with the furnace door to facilitate the rapid removal of the stainless steel strip after annealing.

[0016] 2. In the method for in-furnace annealing of precision stainless steel strips, during the annealing process, due to the extension of the threading rod, the stainless steel strip is stably supported. The driving motor drives the driving gear to make the internal gear ring carry the loading rod to rotate, so that the stainless steel strip rotates and is uniformly heated. Moreover, the extension of the threading rod makes there be a gap between the inside of the stainless steel strip and the outer wall of the loading rod, thus facilitating the entry of heat to heat the stainless steel strip from the inside to the outside at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram after the furnace door of a method for in-furnace annealing of precision stainless steel strips of the present invention is moved outwards; Figure 2 It is a schematic structural diagram when the furnace door and the furnace body of a method for in-furnace annealing of precision stainless steel strips of the present invention are closed; Figure 3 It is a schematic structural diagram of the meshing connection between the internal gear ring and the driving gear of a method for in-furnace annealing of precision stainless steel strips of the present invention; Figure 4 It is a schematic structural diagram of the internal cavity of a method for in-furnace annealing of precision stainless steel strips of the present invention; Figure 5 It is a schematic top view of a dual-channel cross-section of the connecting pipe of a method for in-furnace annealing of precision stainless steel strips of the present invention.

[0018] In the figure: 1, furnace body; 2, vacuum pump; 3, external trolley assembly; 301, support pedestal; 302, internal cavity; 303, first oil pipe; 304, second oil pipe; 305, first pump body; 306, second pump body; 307, piston end; 308, solenoid valve; 309, hollow telescopic rod; 310, furnace door; 311, support wheel; 312, disc; 313, loading rod; 314, threading rod; 315, pipe bearing; 316, connecting pipe; 317, third pump body; 4, internal gear ring; 5, strip rotation assembly; 501, driving gear; 502, driving motor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following further describes in detail the embodiments of the present invention in conjunction with the drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0020] As shown Figures 1-5 in the figure, the present invention provides a technical solution: a method for in-furnace annealing of precision stainless steel strip, and the method for in-furnace annealing of precision stainless steel strip includes the following steps: Step 1: The stainless steel strip to be annealed is sleeved on the surface of the loading rod 313 in a coiled shape; Step 2: The solenoid valve 308 is opened, and the first pump body 305 injects the hydraulic oil into the inner cavity 302 outside the furnace body 1. The hydraulic oil sequentially passes through the solenoid valve 308, the hollow telescopic rod 309, and the third pump body 317 and then enters the inside of the loading rod 313 to push the piercing rod 314 to extend outward to firmly clamp the stainless steel strip from the inside to the outside, wherein the hydraulic oil circulates; Step 3: The second pump body 306 injects the hydraulic oil into the inner cavity 302 outside the furnace body 1, so that the piston end 307 drives the hollow telescopic rod 309 to retract into the inner cavity 302, thereby closing the furnace door 310 and the furnace body 1. At this time, only the loading rod 313, the piercing rod 314, and the disc 312 are located inside the furnace body 1; Step 4: The vacuum pump 2 is started to evacuate the furnace body 1 to a vacuum, and then the temperature inside the furnace body 1 is raised to perform annealing operation on the stainless steel strip; Step 5: During the annealing process, the drive motor 502 located outside the furnace door 310 drives the drive gear 501 to rotate the internal gear ring 4 to drive the loading rod 313 to rotate, so that the stainless steel strip rotates and is uniformly heated; Step 6: After the annealing is completed, the first pump body 305 injects the hydraulic oil into the inner cavity 302. At this time, the solenoid valve 308 is closed, so that the hollow telescopic rod 309 drives the furnace door 310 to move outward. When the furnace door 310 moves outward, it drives the annealed stainless steel strip to move out of the furnace body 1. Finally, the solenoid valve 308 is opened, and the third pump body 317 discharges the hydraulic oil inside the loading rod 313 into the inner cavity 302, so that the piercing rod 314 releases the clamping of the stainless steel strip.

[0021] As shown Figures 1-3As shown in the figure, the in-furnace annealing method of precision stainless steel strip uses a vacuum annealing furnace. The vacuum annealing furnace includes a furnace body 1. A vacuum pump 2 is arranged on the side of the furnace body 1, and an external trolley assembly 3 is arranged at the bottom of the furnace body 1. The external trolley assembly 3 includes a support pedestal 301, an inner cavity 302, a first oil pipe 303, a second oil pipe 304, a first pump body 305 and a second pump body 306. An inner cavity 302 is opened inside the support pedestal 301. One side of the inner cavity 302 is connected to the first pump body 305 through the first oil pipe 303, and the other side of the inner cavity 302 is connected to the second pump body 306 through the second oil pipe 304. The external trolley assembly 3 further includes a piston end 307, a solenoid valve 308 and a hollow telescopic rod 309. The piston end 307 is arranged inside the inner cavity 302, and the solenoid valve 308 is embedded inside the piston end 307. The end face of the piston end 307 is fixed with the hollow telescopic rod 309. The external trolley assembly 3 further includes a furnace door 310 and support wheels 311. One end of the hollow telescopic rod 309 away from the piston end 307 is fixed with the furnace door 310, and support wheels 311 are arranged on both sides of the bottom of the furnace door 310. The external trolley assembly 3 further includes a disc 312, a loading rod 313 and a piercing rod 314. The disc 312 is rotatably connected to one side of the furnace door 310 close to the furnace body 1, and the loading rod 313 is fixed to the side of the disc 312. The piercing rods 314 are evenly arranged on the outer wall of the loading rod 313 in a ring shape. The external trolley assembly 3 further includes a pipe bearing 315, a connecting pipe 316 and a third pump body 317. The middle part of one side of the disc 312 close to the furnace door 310 is rotatably connected to the connecting pipe 316 through the pipe bearing 315, and the bottom of the connecting pipe 316 is connected to the third pump body 317. The bottom of the third pump body 317 is connected to one end of the hollow telescopic rod 309 away from the piston end 307, and the loading rod 313 is communicated with the hollow telescopic rod 309 through the connecting pipe 316 and the third pump body 317; The specific operation is as follows. First, the solenoid valve 308 is closed, and the first pump body 305 injects oil into the inner cavity 302 along the first oil pipe 303. The oil is used to push the piston end 307 to make the hollow telescopic rod 309 extend outwards, so that the furnace door 310 moves away from the furnace body 1; Then, the coiled stainless steel strip to be annealed is sleeved on the surface of the loading rod 313. At this time, the solenoid valve 308 is opened, and the first pump body 305 continues to inject oil into the inner cavity 302. The excess oil passes through the solenoid valve 308, the hollow telescopic rod 309 and the third pump body 317 in sequence and then enters the loading rod 313 to push the piercing rod 314 to extend outwards to firmly clamp the stainless steel strip from the inside to the outside; The first pump body 305 operates in reverse to pump out the hydraulic fluid inside the inner cavity 302, while the second pump body 306 injects hydraulic fluid into the inner cavity 302 along the second hydraulic fluid pipe 304, causing the piston end 307 to retract with the hollow telescopic rod 309, so that the furnace door 310 moves to close with the furnace body 1, thereby feeding the stainless steel strip into the furnace body 1. When the furnace door 310 moves, the support wheel 311 can improve the stability and prevent the hollow telescopic rod 309 from bearing excessive weight; The vacuum pump 2 is started to evacuate the furnace body 1 to a vacuum, and then the temperature inside the furnace body 1 is raised to anneal the stainless steel strip. After the annealing is completed, the first pump body 305 injects hydraulic fluid into the inner cavity 302. At this time, the solenoid valve 308 is closed, causing the hollow telescopic rod 309 to carry the furnace door 310 to move outward. While the furnace door 310 moves outward, it carries the annealed stainless steel strip out of the furnace body 1. Finally, the solenoid valve 308 is opened, and the third pump body 317 drains the hydraulic fluid inside the loading rod 313 into the inner cavity 302, causing the threading rod 314 to release the clamping of the stainless steel strip; There are two hollow telescopic rods 309 respectively. The inner cavities 302 are connected by an electronic valve. The top of the connecting pipe 316 is designed with a double channel and the bottom is designed with a double pipe. Any one of the hollow telescopic rods 309 is an oil inlet pipe, and the other hollow telescopic rod 309 is an oil outlet pipe. The solenoid valves 308 at the ends of the two hollow telescopic rods 309 are both closed. When the electronic valve between the inner cavities 302 is opened, the first pump body 305 injecting hydraulic fluid can cause the hollow telescopic rod 309 to extend. When the solenoid valve 308 is opened and the electronic valve between the inner cavities 302 is closed, the hydraulic fluid enters the inside of the loading rod 313 along any one of the channels at the top of the connecting pipe 316. As the subsequent hydraulic fluid is injected into the inside of the loading rod 313, the hydraulic fluid enters the oil outlet pipe along the other channel inside the connecting pipe 316, and finally the hydraulic fluid returns to the inner cavity 302. Another pipe and pump body with a valve are provided at a position near the end of the oil outlet pipe in the inner cavity 302. The pump body is used to extract the hydraulic fluid discharged from the oil outlet pipe and return it to the fuel tank for cooling, and the valve is closed when the hollow telescopic rod 309 needs to extend; Therefore, during the annealing process, the hydraulic fluid is in a flowing state inside the loading rod 313, thereby preventing the hydraulic fluid from deteriorating due to long-term heating; Based on the above description, only the loading rod 313, the threading rod 314 and the disc 312 of the present invention are located inside the furnace body 1 during the annealing process, and the hydraulic fluid required for the threading rod 314 to extend is in a flowing state, thereby eliminating the problem that the hydraulic fluid of the hydraulic trolley is prone to deterioration due to long-term heating. At the same time, the stainless steel strip moves synchronously with the furnace door 310, so as to quickly take out the stainless steel strip after annealing.

[0022] Such as Figures 1-5As shown in the figure, an internal toothed ring 4 is provided at one side edge of the disc 312 close to the furnace door 310, and a strip rotating assembly 5 is provided inside the internal toothed ring 4. The strip rotating assembly 5 includes a driving gear 501 and a driving motor 502. The driving gear 501 is meshed and connected with the internal toothed ring 4, and the driving motor 502 is connected to the surface of the driving gear 501; The specific operation is as follows. During the annealing process, since the piercing rod 314 extends outwards to stably support the stainless steel strip, the driving motor 502 drives the driving gear 501 to make the internal toothed ring 4 drive the loading rod 313 to rotate, so that the stainless steel strip rotates and is uniformly heated. Moreover, the extension of the piercing rod 314 makes there be a gap between the inside of the stainless steel strip and the outer wall of the loading rod 313, thus facilitating the entry of heat to heat the stainless steel strip from inside to outside at the same time.

[0023] In summary, for the in-furnace annealing method of the precision stainless steel strip, when in use, first, the stainless steel strip to be annealed is in a coiled state and sleeved on the surface of the loading rod 313; The solenoid valve 308 is opened, and the first pump body 305 injects the oil fluid into the inner cavity 302 outside the furnace body 1. The oil fluid sequentially passes through the solenoid valve 308, the hollow telescopic rod 309, and the third pump body 317 and then enters the inside of the loading rod 313 to push the piercing rod 314 to extend outwards to firmly clamp the stainless steel strip from inside to outside, and the oil fluid circulates; The second pump body 306 injects the oil fluid into the inner cavity 302 outside the furnace body 1, so that the piston end 307 drives the hollow telescopic rod 309 to retract into the inner cavity 302, thereby closing the furnace door 310 and the furnace body 1. At this time, only the loading rod 313, the piercing rod 314, and the disc 312 are located inside the furnace body 1; The vacuum pump 2 is started to evacuate the furnace body 1 to a vacuum, and then the temperature inside the furnace body 1 is raised to perform the annealing operation on the stainless steel strip; Among them, since two hollow telescopic rods 309 are respectively provided, the inner cavities 302 are connected by an electronic valve, and the top of the connecting pipe 316 is of a double-channel design and the bottom is of a double-pipe design. Any one of the hollow telescopic rods 309 is an oil inlet pipe, and the other hollow telescopic rod 309 is an oil outlet pipe. The solenoid valves 308 at the ends of the two hollow telescopic rods 309 are both closed. When the electronic valve between the inner cavities 302 is opened, the oil fluid injected by the first pump body 305 can make the hollow telescopic rod 309 extend outwards. When the solenoid valve 308 is opened and the electronic valve between the inner cavities 302 is closed, the oil fluid enters the inside of the loading rod 313 along any one of the channels at the top of the connecting pipe 316. As the subsequent oil fluid is injected into the inside of the loading rod 313, the oil fluid enters the oil outlet pipe along the other channel inside the connecting pipe 316, and finally the oil fluid returns to the inner cavity 302. Another pipeline and pump body with a valve are provided at a position close to the end of the oil outlet pipe in the inner cavity 302. The pump body is used to extract the oil fluid discharged from the oil outlet pipe and return it to the fuel tank for cooling, and the valve is closed when the hollow telescopic rod 309 needs to extend; During the annealing process, the drive motor 502 located outside the furnace door 310 drives the drive gear 501 to rotate the internal gear ring 4, which drives the material carrier rod 313 to rotate, so that the stainless steel strip rotates and is evenly heated. After annealing is completed, the first pump body 305 injects hydraulic oil into the inner cavity 302. At this time, the solenoid valve 308 is closed, so that the hollow telescopic rod 309 drives the furnace door 310 to move outward. While the furnace door 310 moves outward, it drives the annealed stainless steel strip out of the furnace body 1. Finally, the solenoid valve 308 is opened, and the third pump body 317 drains the hydraulic oil inside the material carrier rod 313 into the inner cavity 302, so that the threading rod 314 releases the clamping of the stainless steel strip.

[0024] The embodiments of the present invention are given for purposes of illustration and description, and are not exhaustive or limit the invention to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are chosen and described in order to best explain the principles of the invention and its practical application, and to enable those of ordinary skill in the art to understand the invention and design various embodiments with various modifications suitable for specific purposes.

Claims

1. A method for in-furnace annealing of precision stainless steel strip, characterized in that: The in-furnace annealing method for the precision stainless steel strip includes the following steps: Step 1: The stainless steel strip to be annealed is sleeved on the surface of the loading rod (313) in a coiled shape; Step 2: The solenoid valve (308) is opened, and the first pump body (305) injects oil into the inner cavity (302) outside the furnace body (1). The oil sequentially passes through the solenoid valve (308), the hollow telescopic rod (309), and the third pump body (317) and then enters the inside of the loading rod (313) to push the piercing rod (314) to extend outwards to firmly clamp the stainless steel strip from the inside to the outside, where the oil is circulating; Step 3: The second pump body (306) injects oil into the inner cavity (302) outside the furnace body (1), causing the piston end (307) to carry the hollow telescopic rod (309) to retract into the inner cavity (302), thereby closing the furnace door (310) with the furnace body (1). At this time, only the loading rod (313), the piercing rod (314), and the disc (312) are located inside the furnace body (1); Step 4: The vacuum pump (2) is started to evacuate the furnace body (1) to a vacuum, and then the inside of the furnace body (1) is heated to anneal the stainless steel strip; Step 5: During the annealing process, the drive motor (502) located outside the furnace door (310) drives the drive gear (501) to cause the internal gear ring (4) to carry the loading rod (313) to rotate, so that the stainless steel strip rotates and is evenly heated; Step 6: After annealing, the first pump body (305) injects oil into the inner cavity (302). At this time, the solenoid valve (308) is closed, causing the hollow telescopic rod (309) to carry the furnace door (310) to move outwards. While the furnace door (310) moves outwards, it carries the annealed stainless steel strip out of the furnace body (1). Finally, the solenoid valve (308) is opened, and the third pump body (317) discharges the oil inside the loading rod (313) into the inner cavity (302), causing the piercing rod (314) to release the clamping of the stainless steel strip.

2. The in-furnace annealing method of a precision stainless steel strip according to claim 1, characterized in that: The in-furnace annealing method for the precision stainless steel strip is applied to a vacuum annealing furnace. The vacuum annealing furnace includes a furnace body (1). A vacuum pump (2) is provided on the side of the furnace body (1), and an external trolley assembly (3) is provided at the bottom of the furnace body (1).

3. The in-furnace annealing method of a precision stainless steel strip according to claim 2, characterized in that: The external trolley assembly (3) includes a support pedestal (301), an inner cavity (302), a first oil pipe (303), a second oil pipe (304), a first pump body (305), and a second pump body (306). An inner cavity (302) is opened inside the support pedestal (301), and one end side of the inner cavity (302) is connected to the first pump body (305) through the first oil pipe (303), and the other end side of the inner cavity (302) is connected to the second pump body (306) through the second oil pipe (304).

4. The in-furnace annealing method for a precision stainless steel strip according to claim 3, characterized in that: The external trolley assembly (3) further includes a piston end (307), a solenoid valve (308), and a hollow telescopic rod (309). The piston end (307) is arranged inside the inner cavity (302), and the solenoid valve (308) is embedded inside the piston end (307). The end face of the piston end (307) is fixed with the hollow telescopic rod (309).

5. A method for in-furnace annealing of a precision stainless steel strip according to claim 4, characterized in that: The external trolley assembly (3) further includes a furnace door (310) and support wheels (311). One end of the hollow telescopic rod (309) away from the piston end (307) is fixed with a furnace door (310), and support wheels (311) are arranged on both sides of the bottom of the furnace door (310).

6. The in-furnace annealing method of a precision stainless steel strip according to claim 5, characterized in that: The external trolley assembly (3) further includes a disc (312), a loading rod (313) and a piercing rod (314). A disc (312) is rotatably connected to one side of the furnace door (310) close to the furnace body (1), and a loading rod (313) is fixed to the side surface of the disc (312). Piercing rods (314) are uniformly arranged on the outer wall of the loading rod (313) in an annular shape.

7. The in-furnace annealing method of a precision stainless steel strip according to claim 6, characterized in that: The external trolley assembly (3) further includes a pipe bearing (315), a connecting pipe (316) and a third pump body (317). A connecting pipe (316) is rotatably connected to the middle of one side of the disc (312) close to the furnace door (310) through a pipe bearing (315), and a third pump body (317) is connected to the bottom of the connecting pipe (316).

8. The in-furnace annealing method for a precision stainless steel strip according to claim 7, characterized in that: The bottom of the third pump body (317) is connected to one end of the hollow telescopic rod (309) away from the piston end (307), and the loading rod (313) is communicated with the hollow telescopic rod (309) through the connecting pipe (316) and the third pump body (317).

9. The in-furnace annealing method of a precision stainless steel strip according to claim 8, characterized in that: An internal toothed ring (4) is arranged at the edge of one side of the disc (312) close to the furnace door (310), and a strip rotating assembly (5) is arranged inside the internal toothed ring (4).

10. The in-furnace annealing method for a precision stainless steel strip according to claim 9, characterized in that: The strip rotating assembly (5) includes a driving gear (501) and a driving motor (502). The driving gear (501) is meshed with the internal toothed ring (4), and a driving motor (502) is connected to the surface of the driving gear (501).

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