Medical implantable stainless steel material furnace annealing device and method

Abstract

The application discloses a medical implantable stainless steel material in-furnace annealing device and method, and particularly relates to the field of fan blades, which comprises a support frame, a pedestal one, a vacuum valve gate and a pedestal two are sequentially arranged on the support frame along the workpiece conveying direction, an annealing furnace is fixedly connected in the pedestal one, a rapid cooling furnace is fixedly connected in the pedestal two, a vacuum pump is fixedly connected on the pedestal one, and the vacuum pump and the annealing furnace are communicated through a pipeline; an exhaust port is formed in the top of the rapid cooling furnace, a top shell is fixedly connected on the exhaust port, a filter screen and an air extractor are fixedly connected in the top shell, a three-way valve is fixedly connected at the air outlet end of the top shell, and an exhaust hole and an air inlet hole are arranged on the three-way valve. The annealing furnace, the vacuum valve gate and the rapid cooling furnace are sequentially arranged on the support frame along the workpiece conveying direction, the workpiece is directly transferred from the annealing furnace to the rapid cooling furnace through the vacuum valve gate under the vacuum environment after the annealing is completed, the pitting corrosion resistance and the intergranular corrosion resistance of the material are ensured, and the tissue stability requirement of the medical implantable material is met.

Description

Technical Field

[0001] This invention relates to the field of wind turbine blade technology, and more specifically, to a furnace annealing device and method for implantable stainless steel materials for medical use. Background Technology

[0002] Medical implantable stainless steel materials (such as S31254, S32654 and other super austenitic stainless steels) are widely used in medical devices such as cardiovascular stents, orthopedic implants and dental implants due to their excellent corrosion resistance, good biocompatibility and mechanical strength. After processing and forming, these materials need to undergo solution annealing to eliminate internal stress generated by cold working, improve grain structure and restore the corrosion resistance of the material.

[0003] In the prior art, patent document CN120193154B discloses an in-furnace annealing method for precision stainless steel strip. This method utilizes a vacuum annealing furnace, which includes a furnace body. A vacuum pump is mounted on the side of the furnace body, and an external trolley assembly is mounted on the bottom of the furnace body. An inner cavity is formed inside the support platform, with one end of the cavity connected to a first pump body via a first oil pipe, and the other end connected to a second pump body via a second oil pipe. During annealing, the workpiece is moved into the furnace synchronously with the furnace door via a loading rod and a threading rod. After annealing, the furnace door is opened to... The workpiece is removed from the furnace as a whole and then cooled by an external fan or water cooling jacket. However, the process of removing the workpiece from the furnace after annealing requires moving it from the high-temperature zone inside the furnace to the atmospheric environment outside the furnace. This process takes a long time. During this period, the workpiece temperature is exactly in the sensitization temperature range, which makes it very easy for the uncontrolled precipitation of σ phase and Cr2N to occur. This leads to a significant decrease in the material's resistance to pitting corrosion and intergranular corrosion, which cannot meet the stringent requirements for tissue stability of medical implant materials. Moreover, the cooling efficiency is limited and it is difficult to reach the critical cooling rate required for the solution treatment of super stainless steel. Especially for large cross-section workpieces, the core cooling rate is much lower than that of the surface layer, and the uniformity of the structure is difficult to guarantee.

[0004] In summary, in order to achieve continuous operation of workpieces from high-temperature solution treatment to rapid cooling without atmospheric exposure, it is necessary to solve the problems in the existing technology where the workpiece transfer time after exiting the furnace is too long, resulting in uncontrollable phase precipitation in the sensitization temperature zone, and the external cooling method has insufficient cooling rate and poor microstructure uniformity. The goal is to enable the annealed workpieces to be directly entered into the rapid cooling furnace for high-speed and uniform forced cooling within seconds in a vacuum-sealed environment. Summary of the Invention

[0005] The present invention provides a furnace annealing device and method for implantable stainless steel materials for medical use. The problem to be solved is that in the prior art, the transfer time of the workpiece after exiting the furnace is too long, which leads to uncontrollable phase precipitation in the sensitization temperature zone, and the external cooling method has insufficient cooling rate and poor microstructure uniformity.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a medical implantable stainless steel material furnace annealing device, comprising a support frame, on which a platform one, a vacuum valve gate and a platform two are sequentially installed along the workpiece conveying direction, an annealing furnace is fixedly connected inside platform one, a rapid cooling furnace is fixedly connected inside platform two, a vacuum pump is fixedly connected on platform one, and the vacuum pump and the annealing furnace are connected through a pipeline. The top of the rapid cooling furnace is provided with an exhaust port, and a top shell is fixedly connected to the exhaust port. A filter screen and an exhaust fan are fixedly connected inside the top shell. A three-way valve is fixedly connected to the exhaust end of the top shell, and the three-way valve is provided with an exhaust hole and an air inlet hole. The inner wall of the rapid cooling furnace has several mounting holes, and a main conveying pipe is fixedly connected to the outer wall of the rapid cooling furnace. Several jet nozzles are fixedly connected to the main conveying pipe, and the jet nozzles are installed in the mounting holes. An inert gas reactor is fixedly connected to the base. The outlet of the inert gas reactor is connected to a main delivery pipe and an inlet pipe through pipelines.

[0007] In a preferred embodiment, the first platform has two cavities 1 and the second platform has two cavities 2. The support frame is equipped with a first pushing component and a second pushing component. The output end of the first pushing component is connected to a furnace door 1. The first pushing component is used to drive the first furnace door to reciprocate along the workpiece conveying direction. The first furnace door is fixedly connected to a first mounting shaft. The output end of the second pushing component is connected to a second furnace door. The second pushing component is used to drive the second furnace door to reciprocate along the workpiece conveying direction. The second furnace door is fixedly connected to a second mounting shaft.

[0008] In a preferred embodiment, the pushing assembly includes a pump body 1 fixedly connected to a support frame, a pump body 2 fixedly connected to the support frame, two solenoid valves 1 respectively slidably connected to a cavity 1, and a telescopic rod 1 fixedly connected to the solenoid valves 1. The telescopic rod 1 is fixedly connected to the furnace door 1. The pump body 1 is connected to one side of the cavity 1 through a pipe, and the pump body 2 is connected to the other side of the cavity 1 through a pipe.

[0009] In a preferred embodiment, the pushing assembly 2 includes a pump body 4 fixedly connected to a support frame, a pump body 5 fixedly connected to the support frame, two solenoid valves 2 respectively slidably connected to the cavity 2, and a telescopic rod 2 fixedly connected to the solenoid valves 2. The telescopic rod 2 is fixedly connected to the furnace door 2. The pump body 4 is connected to one side of the cavity 2 through a pipe, and the pump body 5 is connected to the other side of the cavity 2 through a pipe.

[0010] In a preferred embodiment, the mounting shaft 1 is provided with an inner cavity 1, an outer cavity 1, and a docking hole. A piston rod 1 is slidably connected in the inner cavity 1. A pusher plate is fixedly connected to the end of the piston rod 1 away from the annealing furnace. A plurality of push rods arranged in a circumferential array are fixedly connected to the pusher plate. The push rods are slidably connected to the furnace door 1. A plurality of sliding sleeves 1 are fixedly connected in the outer cavity 1. A limit key 1 is slidably connected in the sliding sleeves 1. A pump body 3 is fixedly connected in the furnace door 1. An oil channel 1 is provided in the telescopic rod 1. The oil channel 1 is controlled by a solenoid valve 1. The pump body 3 is connected to the oil channel 1 of the sliding sleeves 1, the inner cavity 1, and the telescopic rod 1 in sequence through pipes.

[0011] In a preferred embodiment, a mounting bracket is fitted onto the mounting shaft, the mounting bracket has a mounting through hole at its center that matches the size of the mounting shaft, a plurality of pushing holes that match the size of the push rod are opened on the end face of the mounting bracket, a plurality of limiting grooves that match the size of the limiting key are opened on the mounting bracket rod, the mounting bracket is axially positioned by the limiting key engaging into the limiting groove, and a plurality of feeding cylinders are mounted on the mounting bracket.

[0012] In a preferred embodiment, the mounting shaft 2 has an inner cavity 2 and an outer cavity 2. A piston rod 2 is slidably connected in the inner cavity 2. A positioning column is fixedly connected to the end of the piston rod 2 near the rapid cooling furnace. A stress sensor is fixedly connected in the positioning column. The stress sensor is used to detect the pressure value when in contact with the docking hole and feed it back to the control system. Several sliding sleeves 2 are fixedly connected in the outer cavity 2. Limit keys 2 are slidably connected in the sliding sleeves 2. A pump body 6 is fixedly connected in the furnace door 2. An oil channel 2 is provided in the telescopic rod 2. The oil channel is controlled by a solenoid valve 2. The pump body 6 is connected to the oil channel 2 of the sliding sleeves 2, the inner cavity 2, and the telescopic rod 2 in sequence through pipes.

[0013] In a preferred embodiment, the bottom of the rapid cooling furnace is provided with a chip discharge port, and the base is provided with a slot. The chip discharge port and the slot are connected, and a chip collection box is installed in the slot.

[0014] When using the in-furnace annealing method for implantable medical stainless steel materials according to this technical solution, an in-furnace annealing device for implantable medical stainless steel materials as described above is employed, and the steps include: S1: Workpiece installation, start the pump body to send oil into the cavity, push the solenoid valve and telescopic rod to extend outward, so that the furnace door is fully opened, and put the mounting bracket containing the workpiece to be annealed onto the mounting shaft through the mounting through hole. S2: After the furnace door is fully opened, the solenoid valve opens and the telescopic rod enters the oil supply. Power is provided by the pump body three. First, oil is sent into the oil inlet of the sliding sleeve one. The limit key one is pushed out and enters the limit groove of the mounting bracket to achieve axial positioning of the mounting bracket. The oil then flows into the inner cavity one and pushes out the piston rod one. The piston rod one drives the push plate and push rod to move outward to complete the fixing of the mounting bracket. After the fixing is completed, the solenoid valve one is closed. Then the pump body two is started to push the telescopic rod one inward to close the furnace door one of the annealing furnace. S3: Start the vacuum pump to evacuate the annealing furnace. After evacuation, start the annealing furnace to heat and anneal the workpiece according to the preset annealing curve. S4: After annealing, start the vacuum pump to extract the gas in the rapid cooling furnace, balance the gas pressure in the annealing furnace and the rapid cooling furnace, and discharge the extracted gas through the exhaust port after being filtered by the filter screen. After the balance is completed, open the vacuum valve. S5: After the vacuum valve gate is opened, the pump body five is started, the solenoid valve two is opened, and the oil enters the inner cavity two through the pipes of the telescopic rod two and the pump body six, pushing out the piston rod two, the positioning column and the stress sensor. Then the oil enters the oil outlet of the sliding sleeve two, pushing the limit key two to retract into the sliding sleeve two. The positioning column extends out and connects with the docking hole of the mounting shaft one to achieve guide connection. The stress sensor detects the docking pressure value in real time and feeds it back to the control system. S6: Start pump body two, solenoid valve one opens, the oil flow direction is opposite to the flow direction of platform one in S, causing limit key one to retract into sliding sleeve one, and at the same time push piston rod one to move inward, driving push plate and push rod to push inward. Push rod pushes mounting bracket from mounting shaft one to mounting shaft two through push hole. After the transfer is completed, the oil flow direction is opposite to the flow direction of fast cooling furnace in S, causing limit key two to extend out of sliding sleeve two, positioning column to retract, and then close vacuum valve gate; S7: After closing the vacuum valve, start the inert gas reactor. The inert gas is injected into the rapid cooling furnace through the main delivery pipe and the jet nozzle to rapidly cool the workpiece. The cooling gas is filtered through the filter screen in the top shell and discharged through the exhaust port of the three-way valve. S8: When there are too many impurities on the filter screen, backflushing is performed. The inert gas reactor backflushes into the top shell through the air inlet to clean the filter screen. The fallen debris falls into the debris collection box, which is periodically removed for cleaning.

[0015] The beneficial effects of this invention are as follows: 1. This invention, by sequentially arranging an annealing furnace, a vacuum valve gate, and a rapid cooling furnace along the workpiece conveying direction on a support frame, allows the workpiece to be directly transferred from the annealing furnace to the rapid cooling furnace in a vacuum environment via the vacuum valve gate after annealing. This effectively avoids the uncontrollable precipitation of σ phase and Cr2N harmful phase in the sensitization temperature range of medical implantable super stainless steel, ensuring the material's resistance to pitting corrosion and intergranular corrosion, and meeting the tissue stability requirements of medical implantable materials.

[0016] 2. This invention achieves uniform and rapid cooling of the workpiece from all directions by uniformly setting conical shrink-type jet nozzles around the inner wall of the rapid cooling furnace, which meets the stringent requirements of the critical cooling rate for the solution treatment of super stainless steel, while ensuring the uniformity of the microstructure between the surface and the core of the workpiece.

[0017] 3. This invention achieves axial locking and positioning of the mounting frame by cooperating with the limiting key on the mounting shaft one and the limiting groove of the mounting frame. The piston rod one drives the pusher plate and push rod to push the mounting frame from the mounting shaft one to the mounting shaft two. With the guidance and docking of the positioning column and the docking hole and the real-time pressure feedback of the stress sensor, the mounting frame is automatically, accurately and smoothly transferred between the annealing furnace and the rapid cooling furnace, ensuring the reliability and repeatability of the process connection.

[0018] 4. This invention filters the cooling gas discharged from the rapid cooling furnace through a filter screen installed inside the top shell, removing metal dust and impurity particles entrained in the gas. A three-way valve switches between gas discharge and recirculation. In conjunction with an inert gas reactor, backflushing cleaning is performed through the air inlet, achieving online self-cleaning of the filter screen. This effectively extends the service life of the filter screen and ensures smooth exhaust during long-term operation. At the same time, it enables the recycling of protective gas, reducing production costs.

[0019] 5. This invention opens a chip discharge port at the bottom of the rapid cooling furnace and connects it to the chip collection box inside the base. This allows the metal oxide scale and dust debris generated during the rapid cooling process to fall automatically into the chip collection box by gravity and be collected in a concentrated manner. This facilitates regular cleaning by operators, effectively maintains the cleanliness of the inside of the rapid cooling furnace and the circulating gas path, reduces the frequency of equipment maintenance, and extends the service life of the equipment. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention.

[0021] Figure 2 This is a schematic cross-sectional view of the overall structure of the present invention.

[0022] Figure 3 This is a schematic diagram of the annealing furnace structure of the present invention.

[0023] Figure 4 This is a cross-sectional structural diagram of the base of the present invention.

[0024] Figure 5 This is a schematic diagram of the furnace door structure of the present invention.

[0025] Figure 6 This is a cross-sectional structural diagram of the mounting shaft of the present invention.

[0026] Figure 7 This is a schematic diagram of the mounting bracket structure of the present invention.

[0027] Figure 8 This is a schematic diagram of the two-section structure of the pedestal of the present invention.

[0028] Figure 9 This is a schematic diagram of the rapid cooling furnace structure of the present invention.

[0029] Figure 10 This is a schematic diagram of the conveying main pipe structure of the present invention.

[0030] Figure 11 This is a schematic diagram of the second cross-sectional structure of the mounting shaft of the present invention.

[0031] The attached diagram is labeled as follows: 1. Support frame; 2. Base 1; 201. Cavity 1; 3. Annealing furnace; 4. Vacuum valve gate; 5. Rapid cooling furnace; 501. Exhaust port; 502. Chip discharge port; 503. Mounting hole; 601. Pump body 1; 602. Pump body 2; 603. Solenoid valve 1; 604. Telescopic rod 1; 7. Furnace door 1; 8. Mounting shaft 1; 801. Inner cavity 1; 802. Outer cavity 1; 803. Connecting hole; 9. Sliding sleeve 1; 10. Limit key 1; 11. Piston rod 1; 12. Push plate; 13. Push rod; 14. Pump body 3; 15. Mounting frame; 1501. Mounting through hole; 1502. Push hole; 1503. Limiting groove; 16. Discharge cylinder; 7. Vacuum pump; 18. Base II; 1801. Cavity II; 1802. Slot; 1901. Pump body IV; 1902. Pump body V; 1903. Solenoid valve II; 1904. Telescopic rod II; 20. Furnace door II; 21. Mounting shaft II; 2101. Inner cavity II; 2102. Outer cavity II; 22. Sliding sleeve II; 23. Limit key II; 24. Piston rod II; 25. Positioning column; 26. Stress sensor; 27. Pump body VI; 28. Inert gas reactor; 29. ​​Main conveying pipe; 30. Jet nozzle; 31. Top shell; 32. Filter screen; 33. Evacuator; 34. Three-way valve; 3401. Exhaust port; 3402. Inlet port; 35. Chip collection box. Detailed Implementation

[0032] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0033] Refer to the instruction manual appendix Figures 1 to 11A medical implantable stainless steel material furnace annealing device includes a support frame 1. A platform 1 2, a vacuum valve gate 4 and a platform 2 18 are installed sequentially on the support frame 1 along the workpiece conveying direction. An annealing furnace 3 is fixedly connected inside the platform 1 2. A rapid cooling furnace 5 is fixedly connected inside the platform 2 18. A vacuum pump 17 is fixedly connected on the platform 1 2. The vacuum pump 17 and the annealing furnace 3 are connected through a pipeline. The top of the rapid cooling furnace 5 is provided with an exhaust port 501. A top shell 31 is fixedly connected to the exhaust port 501. A filter screen 32 and an exhaust fan 33 are fixedly connected inside the top shell 31. A three-way valve 34 is fixedly connected to the exhaust end of the top shell 31. The three-way valve 34 is provided with an exhaust hole 3401 and an air inlet hole 3402. The inner wall of the fast cooling furnace 5 has several mounting holes 503. The outer wall of the fast cooling furnace 5 is fixedly connected to a conveying main pipe 29. Several jet nozzles 30 are fixedly connected to the conveying main pipe 29 and are installed in the mounting holes 503. An inert gas reactor 28 is fixedly connected to the base 2. The outlet of the inert gas reactor 28 is connected to a main delivery pipe 29 and an inlet 3402 through pipes.

[0034] It should be noted that the support frame 1 is a frame structure extending along the workpiece conveying direction, providing a stable mounting base for each component. Platform 1 2 and Platform 2 18 are respectively installed at both ends of the support frame 1. Platform 1 2 supports the annealing furnace 3 and related drive components, while Platform 2 18 supports the rapid cooling furnace 5 and related dust collection components. The annealing furnace 3 is a horizontal cylindrical resistance heating furnace with resistance heating wire wound around its inner wall, used for uniformly heating and annealing medical implantable stainless steel materials. The annealing temperature is controlled between 800℃ and 1050℃. The rapid cooling furnace 5 is a horizontal cylindrical structure used for rapid forced cooling of the annealed workpiece, with a cooling rate controlled between 50℃ / s and 100℃ / s. A vacuum pump... 17 is used to perform vacuum treatment inside the annealing furnace 3 to create an oxygen-free annealing environment and prevent the stainless steel material from oxidizing at high temperature. The exhaust port 501 is opened at the center of the top of the rapid cooling furnace 5 to quickly exhaust the high-temperature gas inside the rapid cooling furnace 5. The top shell 31 is a rectangular hollow shell structure, which is fixedly and sealed above the exhaust port 501. Inside it, from bottom to top, there are a filter screen 32 and a vacuum pump 33. The filter screen 32 is a multi-layer metal sintered mesh, which is used to filter metal dust and impurity particles entrained in the cooling gas. The vacuum pump 33 is used to force the gas inside the rapid cooling furnace 5 to be extracted and form a negative pressure environment. The three-way valve 34 is an electromagnetic reversing three-way valve, which is fixed at the gas outlet end of the top shell 31 and is used to switch the gas flow path.

[0035] It is worth noting that the mounting holes 503 are multiple sets of circular through holes evenly distributed around the inner wall of the rapid cooling furnace 5, used to install the jet nozzles 30 and provide gas injection channels. The main conveying pipe 29 is an annular tubular structure, fixed around both sides of the outer wall of the rapid cooling furnace 5, used to evenly distribute the cooling gas from the inert gas reactor 28 to each jet nozzle 30. The jet nozzle 30 is a conical contraction ceramic nozzle, and its outlet end face is flush with the inner wall of the rapid cooling furnace 5, used to spray the cooling gas onto the workpiece surface in the form of a high-speed jet, so as to achieve rapid and uniform cooling of the workpiece. The inert gas reactor 28 is a sealed tank structure, and its outlet end is equipped with a pressure reducing valve and a flow regulating valve, used to provide protective cooling gas to the annealing device, and at the same time, it is connected to the top shell 31 through the air inlet 3402 to realize the recycling of gas.

[0036] Refer to the instruction manual appendix Figures 4 to 9 The platform 1 has two cavities 201 and the platform 2 has two cavities 1801. The support frame 1 is equipped with a first pushing component and a second pushing component. The output end of the first pushing component is connected to a furnace door 7. The first pushing component is used to drive the furnace door 7 to move back and forth along the workpiece conveying direction. The first mounting shaft 8 is fixedly connected to the furnace door 7. The output end of the second pushing component is connected to a second furnace door 20. The second pushing component is used to drive the second furnace door 20 to move back and forth along the workpiece conveying direction. The second mounting shaft 21 is fixedly connected to the second furnace door 20.

[0037] It should be noted that cavity 201 is a cylindrical sealed cavity opened inside the base 2, there are two of them and they are symmetrically distributed on both sides of the base 2. Each cavity 201 is slidably connected to a solenoid valve 603. The solenoid valve 603 is a two-position four-way solenoid directional valve, which is circumferentially sealed and embedded in the cavity 201 and divides the cavity 201 into a front cavity and a rear cavity that are not interconnected. A telescopic rod 604 is fixedly connected to the solenoid valve 603. The telescopic rod 604 is a hollow telescopic rod, and its interior has a central flow channel for oil flow. One end of the telescopic rod 604 is fixedly connected to the solenoid valve 603, and the other end passes through the base. The side wall of the first 2 is fixedly connected to the furnace door 7. The pump body 601 is connected to the front cavity of the two cavities 201 through a pipe, and the pump body 602 is connected to the rear cavity of the two cavities 201 through a pipe. By alternately injecting or extracting oil into the front or rear cavity of the cavity 201 by the pump body 601 and the pump body 602, the solenoid valve 603 and the telescopic rod 604 are driven to slide back and forth in the cavity 201, thereby driving the furnace door 7 to move back and forth along the workpiece conveying direction to realize the opening and closing of the annealing furnace 3. The center of the furnace door 7 is fixedly connected to the mounting shaft 8, which is used to carry the mounting frame 15 and transport the mounting frame 15 into the annealing furnace 3.

[0038] It is worth noting that cavity 2 1801 is a cylindrical sealed cavity opened inside pedestal 2 18. There are two symmetrically distributed on both sides of pedestal 2 18. Each cavity 2 1801 is slidably connected to a solenoid valve 2 1903. Solenoid valve 2 1903 is a two-position four-way solenoid directional valve, which is circumferentially sealed and embedded in cavity 2 1801, dividing cavity 2 1801 into a front cavity and a rear cavity that are not interconnected. Telescopic rod 2 1904 is fixedly connected to solenoid valve 2 1903. Telescopic rod 2 1904 is a hollow telescopic rod with a central flow channel for oil flow opened axially inside. One end of telescopic rod 2 1904 is fixedly connected to solenoid valve 2 1903, and the other end passes through it. The side wall of the platform 218 is fixedly connected to the furnace door 20. The pump body 41901 is connected to the front cavity of the two cavities 21801 through a pipe, and the pump body 51902 is connected to the rear cavity of the two cavities 21801 through a pipe. The pump body 41901 and the pump body 51902 alternately inject or extract oil into the front or rear cavity of the cavity 21801, driving the solenoid valve 21903 and the telescopic rod 21904 to slide back and forth in the cavity 21801, thereby driving the furnace door 20 to move back and forth along the workpiece conveying direction to realize the opening and closing of the fast cooling furnace 5. The center of the furnace door 220 is fixedly connected to the mounting shaft 221, which is used to dock with the mounting shaft 18 and support the mounting bracket 15.

[0039] Refer to the instruction manual appendix Figure 4 The first pushing component includes a pump body 601 fixedly connected to the support frame 1, a second pump body 602 fixedly connected to the support frame 1, two solenoid valves 603 respectively slidably connected in the cavity 201, and a telescopic rod 604 fixedly connected to the solenoid valves 603. The telescopic rod 604 is fixedly connected to the furnace door 7. The first pump body 601 is connected to one side of the cavity 201 through a pipe, and the second pump body 602 is connected to the other side of the cavity 201 through a pipe.

[0040] It should be noted that both pump body 601 and pump body 602 are fixed displacement hydraulic pumps. Their outlets are respectively connected to the front and rear sides of cavity 201 via high-pressure oil pipes, allowing for alternating supply and withdrawal of hydraulic oil into or from cavity 201 to provide reciprocating driving force. Each cavity 201 is slidably connected to a solenoid valve 603, dividing the internal space of cavity 201 into a non-communicating front and rear chamber. The solenoid valve 603 can switch the oil circuit direction. The telescopic rod 604 is a hollow telescopic rod with an axially extending oil supply channel in the center of the cylinder. The oil inlet of the oil supply channel is sealed and connected to the oil outlet of the solenoid valve 603. The end of the telescopic rod 604 passes through the side wall of the platform 2 and is fixedly connected to the furnace door 7, so that the telescopic rod 604 can extend or retract axially under the drive of hydraulic oil, thereby realizing the long-stroke reciprocating movement of the furnace door 7.

[0041] Refer to the instruction manual appendix Figure 8 The second pushing component includes a pump body 1901 fixedly connected to the support frame 1, a pump body 1902 fixedly connected to the support frame 1, two solenoid valves 1903 slidably connected to the cavity 1801, and a telescopic rod 1904 fixedly connected to the solenoid valves 1903. The telescopic rod 1904 is fixedly connected to the furnace door 20. The pump body 1901 is connected to one side of the cavity 1801 through a pipe, and the pump body 1902 is connected to the other side of the cavity 1801 through a pipe.

[0042] It should be noted that both pump body 4 (1901) and pump body 5 (1902) are fixed displacement hydraulic pumps. Their outlets are respectively connected to the front and rear sides of cavity 2 (1801) via high-pressure oil pipes, allowing for the alternating supply and withdrawal of hydraulic oil into or from cavity 2 (1801) to provide reciprocating driving force. Each cavity 2 (1801) is slidably connected to a solenoid valve 2 (1903), dividing the internal space of cavity 2 (1801) into a non-communicating front and rear chambers. The solenoid valve 2 can switch the oil flow direction. The telescopic rod 1904 is a hollow telescopic rod with an axially extending oil supply channel in the center. The oil inlet of the oil supply channel is sealed and connected to the oil outlet of the solenoid valve 1903. The end of the telescopic rod 1904 passes through the side wall of the platform 18 and is fixedly connected to the furnace door 20. The telescopic rod 1904 can extend or retract axially under the drive of hydraulic oil, thereby realizing the long-stroke reciprocating movement of the furnace door 20.

[0043] Refer to the instruction manual appendix Figure 6 The mounting shaft 8 is provided with an inner cavity 801, an outer cavity 802 and a docking hole 803. A piston rod 11 is slidably connected in the inner cavity 801. A pusher plate 12 is fixedly connected to the end of the piston rod 11 away from the annealing furnace 3. Several push rods 13 arranged in a circular array are fixedly connected to the pusher plate 12. The push rods 13 are slidably connected to the furnace door 7. Several sliding sleeves 9 are fixedly connected in the outer cavity 802. A limit key 10 is slidably connected in the sliding sleeves 9. A pump body 14 is fixedly connected in the furnace door 7. An oil channel 1 is provided in the telescopic rod 604. The oil channel is controlled by a solenoid valve 603. The pump body 14 is connected to the oil channel 1 of the sliding sleeves 9, the inner cavity 801 and the telescopic rod 604 in sequence through pipes.

[0044] It should be noted that the mounting shaft 8 is a cylindrical shaft extending horizontally, with its central axis collinear with the central axis of the furnace opening of the annealing furnace 3. The mounting shaft 8 has an inner cavity 801 and an outer cavity 802. The inner cavity 801 is a cylindrical blind hole inside the mounting shaft 8, used to accommodate the piston rod 11 and provide sliding guidance. The outer cavity 802 is an annular groove on the outer circumference of the mounting shaft 8, used to accommodate the sliding sleeve 9 and the limiting key 10. The mating hole 803 is a circular recessed hole near the center of the end face of the mounting shaft 8 close to the annealing furnace 3, used for guiding and positioning. The piston rod 11 is a cylindrical rod whose outer circumferential surface slides and seals against the inner wall of the inner cavity 801. Piston rod 11 can slide back and forth along the axial direction of inner cavity 801 under the drive of hydraulic oil. The end of piston rod 11 away from annealing furnace 3 passes through the end face of mounting shaft 8 and is fixedly connected to push disk 12. Push disk 12 is a circular disk structure with a diameter larger than the outer diameter of mounting shaft 8. It is used to support and drive push rod 13 to move synchronously. Several push rods 13 are fixedly connected to the end face of push disk 12 away from piston rod 11 in a circumferential array. Push rod 13 is a slender cylindrical rod. The number of push rods is preferably four and they are evenly distributed along the circumference of push disk 12. The axis of each push rod 13 is parallel to the axis of mounting shaft 8. The end of push rod 13 passes through the guide hole opened on furnace door 7 and extends out of furnace door 7 towards the side facing annealing furnace 3.

[0045] It is worth noting that several sliding sleeves 9 are fixedly connected inside the outer cavity 802. The number of sliding sleeves 9 is equal to the number of limiting keys 10, and preferably four. The sliding sleeves 9 are rectangular hollow sleeves, which are fixedly embedded in the outer cavity 802 with their openings facing the radial direction of the mounting shaft 8. Each sliding sleeve 9 is slidably connected to a limiting key 10. The limiting key 10 is a rectangular block structure. The limiting key 10 can extend or retract radially along the sliding sleeve 9 under the drive of hydraulic oil. When extended, it is engaged in the limiting groove 1503 of the mounting bracket 15 to achieve axial locking and positioning of the mounting bracket 15. When retracted, it disengages from the limiting groove 1503 to release the locking of the mounting bracket 15. At the same time, the furnace door 7 is fixedly embedded inside. The pump body 14 is a miniature hydraulic pump that moves synchronously with the furnace door 7. The oil inlet of the pump body 14 is sealed and connected to the oil outlet of the oil channel 1 opened inside the telescopic rod 604 through a pipe. The oil channel 1 extends along the axial direction of the telescopic rod 604, and its opening and closing is controlled by the valve core of the solenoid valve 603. The oil outlet of the pump body 14 is sealed and connected to the oil inlet of the sliding sleeve 9 and the oil inlet of the inner cavity 801 through oil pipes embedded inside the mounting shaft 8. The pump body 14 is used to distribute the hydraulic oil delivered through the oil channel 1 to the sliding sleeve 9 and the inner cavity 801 in sequence, so as to drive the limit key 10 to extend for positioning and the piston rod 11 to push outward.

[0046] Refer to the instruction manual appendix Figure 7A mounting bracket 15 is fitted onto the mounting shaft 8. The mounting bracket 15 has a mounting through hole 1501 at its center that matches the size of the mounting shaft 8. Several pushing holes 1502 that match the size of the push rod 13 are opened on the end face of the mounting bracket 15. Several limiting grooves 1503 that match the size of the limiting key 10 are opened on the rod body of the mounting bracket 15. The mounting bracket 15 is axially positioned by the limiting key 10 engaging with the limiting groove 1503. Several feeding cylinders 16 are installed on the mounting bracket 15.

[0047] It should be noted that the mounting bracket 15 is a disc-shaped frame structure with an axial through-hole 1501 at its center. Its inner diameter precisely matches the outer diameter of the mounting shaft 8, ensuring smooth sliding of the mounting bracket 15 along the outer wall of the mounting shaft 8 without radial movement. Several pushing holes 1502 are provided on the end face of the mounting bracket 15 near the furnace door 7. These pushing holes 1502 are circular and their number is equal to the number of push rods 13, with each hole corresponding to a specific position. They allow the push rods 13 to pass through and push against the end face of the mounting bracket 15. Several limiting grooves 1503 are provided on the outer periphery of the mounting bracket 15. These limiting grooves 1503 are rectangular grooves, their number equal to the number of limiting keys 10, with each groove corresponding to a specific position. When the limiting keys 10 are driven by hydraulic oil... When the lower edge extends radially, the outer end of the limiting key 10 is engaged in the corresponding limiting groove 1503, thereby achieving axial locking and positioning of the mounting frame 15 on the mounting shaft 8, preventing axial movement of the mounting frame 15 during transportation. The mounting frame 15 is also equipped with several feeding cylinders 16 for accommodating medical implantable stainless steel rods or wires to be annealed. One end of the feeding cylinder 16 is fixedly connected to the mounting frame 15, and the other end is an open feeding port. The feeding port is equipped with a high-temperature resistant spring buckle for closing or opening the feeding cylinder 16. The feeding cylinder 16 is used to transfer between the annealing furnace 3 and the fast cooling furnace 5 together with the mounting frame 15, so that the workpieces are kept in an orderly arrangement in the furnace and that the airflow or cooling gas can penetrate the surface of each workpiece evenly during annealing and cooling.

[0048] Refer to the instruction manual appendix Figure 11 The mounting shaft 21 has an inner cavity 2101 and an outer cavity 2102. A piston rod 24 is slidably connected in the inner cavity 2101. A positioning column 25 is fixedly connected to one end of the piston rod 24 near the fast cooling furnace 5. A stress sensor 26 is fixedly connected in the positioning column 25. The stress sensor 26 is used to detect the pressure value when in contact with the docking hole 803 and feed it back to the control system. Several sliding sleeves 22 are fixedly connected in the outer cavity 2102. Limit keys 23 are slidably connected in the sliding sleeves 22. A pump body 6 27 is fixedly connected in the furnace door 20. An oil channel 2 is provided in the telescopic rod 2904. The oil channel is controlled by a solenoid valve 2903. The pump body 6 27 is connected to the oil channel 2 of the sliding sleeves 22, the inner cavity 2101 and the telescopic rod 2904 in sequence through pipes.

[0049] It should be noted that the second mounting shaft 21 is a cylindrical shaft extending horizontally, with its central axis collinear with the central axis of the furnace mouth of the rapid cooling furnace 5. The second inner cavity 2101 is a cylindrical blind hole opened inside the second mounting shaft 21 to accommodate the second piston rod 24 and provide sliding guidance. The second outer cavity 2102 is an annular groove opened on the outer circumference of the second mounting shaft 21 to accommodate the second sliding sleeve 22 and the second limiting key 23. The second piston rod 24 is a cylindrical rod whose outer circumferential surface slides and seals against the inner wall of the second inner cavity 2101. The second piston rod 24 can reciprocate axially along the second inner cavity 2101 under hydraulic oil drive. The end of the second piston rod 24 near the rapid cooling furnace 5 passes through the end face of the second mounting shaft 21 and is fixedly connected to a positioning pin 2. 5. The positioning post 25 is a cylindrical column whose outer diameter is adapted to the inner diameter of the mating hole 803 on the end face of the mounting shaft 8. It serves as a guide and center when the positioning post 25 extends into the mating hole 803, guiding the mounting shaft 21 and the mounting shaft 8 to achieve precise mating. A stress sensor 26 is fixedly embedded in the center of the positioning post 25. The stress sensor 26 is a high-temperature resistant piezoelectric ceramic sensor, which is used to detect the pressure value of the contact surface in real time when the positioning post 25 and the mating hole 803 are mated, and convert the pressure signal into an electrical signal to feed back to the control system. The control system determines whether the mating is in place based on the feedback pressure value. When the pressure value reaches the preset threshold, it controls the corresponding hydraulic pump to stop supplying oil to prevent excessive mating pressure from damaging the workpiece or structural components.

[0050] It is worth noting that several sliding sleeves 22 are fixedly connected inside the outer cavity 2102. The number of sliding sleeves 22 is equal to the number of limiting keys 23, and preferably four. The sliding sleeves 22 are rectangular hollow sleeves, which are fixedly embedded in the outer cavity 2102 with their openings facing the radial direction of the mounting shaft 21. Each sliding sleeve 22 is slidably connected to a limiting key 23. The limiting key 23 is a rectangular block structure. The limiting key 23 can extend or retract radially along the sliding sleeve 22 under the drive of hydraulic oil. When extended, it is used to engage with the limiting groove 1503 of the mounting bracket 15 to achieve axial locking and positioning of the mounting bracket 15 on the mounting shaft 21. When retracted, it disengages from the limiting groove 1503 to release the locking of the mounting bracket 15. The internal structure of the furnace door 20 is fixed. A pump body 27 is fixedly installed. The pump body 27 is a miniature hydraulic pump that moves synchronously with the furnace door 20. The oil inlet of the pump body 27 is sealed and connected to the oil outlet of the oil channel 2 inside the telescopic rod 2904 through a pipe. The oil channel 2 extends along the axial direction of the telescopic rod 2904. Its opening and closing is controlled by the valve core of the solenoid valve 2903. The oil outlet of the pump body 27 is sealed and connected to the oil outlet of the sliding sleeve 22 and the oil inlet of the inner cavity 2101 through an oil pipe embedded in the mounting shaft 21. The pump body 27 is used to distribute the hydraulic oil delivered through the oil channel 2 to the inner cavity 2101 and the sliding sleeve 22 in sequence, so as to drive the positioning column 25 to extend outward for docking and the limit key 23 to retract and unlock.

[0051] Refer to the instruction manual appendix Figure 9 The bottom of the fast cooling furnace 5 is provided with a chip discharge port 502, and the base 18 is provided with a slot 1802. The chip discharge port 502 and the slot 1802 are connected, and a chip collection box 35 is installed in the slot 1802.

[0052] It should be noted that the chip discharge port 502 is a rectangular through hole opened on the bottom wall of the rapid cooling furnace 5. Its position is located at the lowest point of the inner cavity of the rapid cooling furnace 5. It is used to discharge metal oxide scale, dust and debris and other impurities generated during the rapid cooling process naturally from the rapid cooling furnace 5 by gravity. The base 2 18 has a slot 1802 inside, with its opening facing the bottom of the base 2 18. The upper port of the slot 1802 is directly opposite to the lower port of the chip discharge port 502 and is connected to each other. It is used to receive the debris falling from the chip discharge port 502 and guide it into the chip collection box 35. The chip collection box 35 is a rectangular box structure with an open top. Its external dimensions are adapted to the internal dimensions of the slot 1802. It is used to collect and store various impurities and debris falling from the chip discharge port 502, which is convenient for regular cleaning of the collected debris to maintain the cleanliness of the inside of the rapid cooling furnace 5.

[0053] Refer to the instruction manual appendix Figures 1 to 11 In this embodiment, when using the in-furnace annealing method for implantable medical stainless steel materials according to this technical solution, an in-furnace annealing device for implantable medical stainless steel materials as described above is employed, and the steps include: S1: Workpiece installation, start pump body 601 to send oil into cavity 201, push solenoid valve 603 and telescopic rod 604 to extend outward, so that furnace door 7 is fully opened, and mount bracket 15 containing workpiece to be annealed is sleeved on mounting shaft 8 through mounting through hole 1501. S2: After the furnace door 7 is fully opened, the solenoid valve 603 opens, the telescopic rod 604 enters the oil, and the pump body 14 provides power to first send oil into the oil inlet of the sliding sleeve 9, push out the limit key 10 into the limit groove 1503 of the mounting bracket 15 to achieve axial positioning of the mounting bracket 15. The oil then flows into the inner cavity 801, pushes out the piston rod 11, and the piston rod 11 drives the pusher plate 12 and push rod 13 to move outward to complete the fixing of the mounting bracket 15. After the fixing is completed, the solenoid valve 603 closes, and then the pump body 602 is started to push the telescopic rod 604 inward to close the furnace door 7 and the annealing furnace 3. S3: Start vacuum pump 17 to evacuate annealing furnace 3. After evacuation is completed, start annealing furnace 3 to heat and anneal the workpiece according to the preset annealing curve. S4: After annealing, start the vacuum pump 33 to extract the gas in the rapid cooling furnace 5, balance the gas pressure in the annealing furnace 3 and the rapid cooling furnace 5. The extracted gas is filtered by the filter screen 32 and discharged through the exhaust port 3401. After balancing, open the vacuum valve gate 4. S5: After the vacuum valve gate 4 is opened, the pump body 1902 is started, the solenoid valve 1903 is opened, and the oil enters the inner cavity 2101 through the pipes of the telescopic rod 1904 and the pump body 27, pushing out the piston rod 24, the positioning column 25 and the stress sensor 26. Then the oil enters the oil outlet of the sliding sleeve 22, pushing the limit key 23 to retract into the sliding sleeve 22. The positioning column 25 extends out and connects with the docking hole 803 of the mounting shaft 8, realizing the guide connection. The stress sensor 26 detects the docking pressure value in real time and feeds it back to the control system. S6: Start pump body 2 602, solenoid valve 1 603 opens, the oil flow direction is opposite to the flow direction of platform 2 in S2, causing limit key 10 to retract into sliding sleeve 9, and at the same time pushing piston rod 11 to move inward, driving pusher plate 12 and push rod 13 to push inward. Push rod 13 pushes mounting bracket 15 from mounting shaft 8 to mounting shaft 21 through push hole 1502. After the transfer is completed, the oil flow direction is opposite to the flow direction of rapid cooling furnace 5 in S5, causing limit key 23 to extend out of sliding sleeve 22, positioning column 25 to retract, and then vacuum valve gate 4 is closed; S7: After closing the vacuum valve gate 4, start the inert gas reactor 28. The inert gas is injected into the rapid cooling furnace 5 through the main conveying pipe 29 and the jet nozzle 30 to rapidly cool the workpiece. The cooling gas is filtered through the filter screen 32 in the top shell 31 and discharged through the exhaust port 3401 of the three-way valve 34. S8: When there are too many impurities in the filter screen 32, backflushing is performed for cleaning. The inert gas reactor 28 backflushes into the top shell 31 through the air inlet 3402 to clean the filter screen 32. The fallen debris falls into the debris collection box 35, which is periodically removed for cleaning.

[0054] It should be noted that in the above annealing method, the steps are automatically connected through the timing control of the pump body, solenoid valve, and vacuum valve gate by the control system. The control system is a PLC programmable logic controller, which has preset action sequence and action time of each actuator to coordinate the transfer of workpieces and the switching of process parameters between the annealing furnace 3 and the rapid cooling furnace 5. In step S1, when the pump body 601 delivers oil into the cavity 201, the solenoid valves 603 in the two cavities 201 act synchronously to ensure that the force on both sides of the furnace door 7 is uniform and the movement is smooth and does not deviate. After the furnace door 7 is fully opened, the operator puts the mounting bracket 15 onto the mounting shaft 8 from the furnace opening. The mounting through hole 1501 of the mounting bracket 15 and the mounting shaft 8 are clearance fit. To ensure that the mounting bracket 15 can be smoothly inserted without significant wobbling, in step S2, the limit key 10 actuates before the piston rod 11. Its design purpose is to first axially lock the mounting bracket 15 onto the mounting shaft 8, preventing axial movement of the mounting bracket 15 when the pusher disc 12 and push rod 13 move outwards. This ensures that the push rod 13 can accurately pass through the push hole 1502 without deviation or jamming. After the push rod 13 moves outwards and passes through the push hole 1502, its end protrudes from the end face of the mounting bracket 15. At this point, the push rod 13 serves both as an auxiliary fixation for the mounting bracket 15 and as a pre-set contact surface for subsequently pushing the mounting bracket 15 away from the mounting shaft 8. In step S4, the vacuum pump 33 extracts gas from the rapid cooling furnace 5 to achieve the connection between the annealing furnace 3 and the rapid cooling furnace 5. The purpose of the air pressure balance is to prevent the instantaneous airflow impact caused by excessive pressure difference on both sides when the vacuum valve gate 4 is opened, and to avoid oxidation or deformation of the surface of the high-temperature workpiece due to airflow disturbance. The filter screen 32 filters the extracted gas to prevent impurity particles from being discharged into the external environment. In step S5, the guide cone surface of the positioning post 25 plays an automatic centering and correction role when it extends into the docking hole 803, compensating for the coaxiality deviation between the mounting shaft 1 8 and the mounting shaft 21. The stress sensor 26 detects the docking pressure value in real time and feeds the signal back to the control system. The control system judges whether the positioning post 25 is fully in place according to the pressure change. When the pressure reaches the preset threshold, the pump body 5 1902 stops oil supply to prevent over-positioning damage. The limit key 23 is in place when the positioning post 25 extends. During the process, the sliding sleeve 22 is first retracted to avoid interference between the limiting key 23 and the limiting groove 1503 of the mounting bracket 15, which would hinder the axial sliding of the mounting bracket 15. In step S6, when the oil flows in the reverse direction, the limiting key 10 retracts and the piston rod 11 pushes inward simultaneously. The end of the push rod 13 abuts against the inner wall of the push hole 1502 and continuously applies a pushing force, pushing the mounting bracket 15 axially from the mounting shaft 8 to the mounting shaft 21. After the mounting bracket 15 is transferred, the limiting key 23 extends and engages in the limiting groove 1503, locking the mounting bracket 15 onto the mounting shaft 21. The positioning pin 25 retracts, causing the mounting shaft 8 and the mounting shaft 21 to disengage. The vacuum valve gate 4 closes, causing the annealing furnace 3 and the rapid cooling furnace 5 to be re-separated into two independent sealed chambers.To facilitate the parallel operation of subsequent rapid cooling and annealing processes, in step S7, the conical contraction structure of the jet nozzle 30 accelerates the inert gas to a high-speed jet of no less than 50 m / s. The high-speed jet directly impacts the workpiece surface to achieve high-intensity convective heat transfer. Combined with the radiative heat transfer of the circulating water cooling channel inside the rapid cooling furnace 5 cylinder wall, rapid and uniform cooling of the workpiece is achieved. The cooling rate is controlled between 50℃ / s and 100℃ / s to meet the solid solution treatment process requirements of medical implantable stainless steel materials. After cooling, the gas is filtered through the filter screen 32 inside the top shell 31 to remove entrained metal dust before being passed through... The gas is safely discharged through the exhaust port 3401. In step S8, during backflushing cleaning, the three-way valve 34 switches to the inlet port 3402 passage. The high-pressure gas provided by the inert gas reactor 28 is blown back into the top shell 31 through the inlet port 3402. The airflow direction is opposite to the normal exhaust direction, which backflushes and removes impurities adhering to the air inlet side surface of the filter screen 32. The detached debris falls into the chip collection box 35 through the chip discharge port 502 under gravity, realizing online self-cleaning of the filter screen 32 without stopping the machine for disassembly and cleaning. This effectively extends the service life of the filter screen 32 and ensures smooth exhaust during long-term operation.

[0055] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A furnace annealing device for implantable stainless steel materials, characterized in that: Includes a support frame (1), on which a platform (2), a vacuum valve gate (4) and a platform (18) are installed in sequence along the workpiece conveying direction. An annealing furnace (3) is fixedly connected inside the platform (2), and a fast cooling furnace (5) is fixedly connected inside the platform (18). A vacuum pump (17) is fixedly connected on the platform (2), and the vacuum pump (17) and the annealing furnace (3) are connected through a pipeline. The top of the rapid cooling furnace (5) is provided with an exhaust port (501), and a top shell (31) is fixedly connected to the exhaust port (501). A filter screen (32) and an air extractor (33) are fixedly connected inside the top shell (31). A three-way valve (34) is fixedly connected to the exhaust end of the top shell (31). An exhaust hole (3401) and an air inlet hole (3402) are provided on the three-way valve (34). Several mounting holes (503) are provided on the inner wall of the rapid cooling furnace (5). A conveying main pipe (29) is fixedly connected to the outer wall of the rapid cooling furnace (5). Several jet nozzles (30) are fixedly connected to the conveying main pipe (29). The jet nozzles (30) are installed in the mounting holes (503). An inert gas reactor (28) is fixedly connected to the base (2). The outlet of the inert gas reactor (28) is connected to a main pipeline (29) and an inlet (3402) through pipes.

2. The in-furnace annealing device for implantable stainless steel materials according to claim 1, characterized in that: Two cavities (201) are opened in the first platform (2), and two cavities (1801) are opened in the second platform (18). Pushing component one and pushing component two are installed on the support frame (1). The output end of the pushing component one is connected to the furnace door one (7). The pushing component one is used to drive the furnace door one (7) to move back and forth along the workpiece conveying direction. The mounting shaft one (8) is fixedly connected to the furnace door one (7). The output end of the pushing component two is connected to the furnace door two (20). The pushing component two is used to drive the furnace door two (20) to move back and forth along the workpiece conveying direction. The mounting shaft two (21) is fixedly connected to the furnace door two (20).

3. The in-furnace annealing device for implantable stainless steel materials according to claim 2, characterized in that: The pushing assembly includes a pump body 1 (601) fixedly connected to the support frame (1), a pump body 2 (602) fixedly connected to the support frame (1), two solenoid valves 1 (603) respectively slidably connected in the cavity 1 (201), and a telescopic rod 1 (604) fixedly connected to the solenoid valve 1 (603). The telescopic rod 1 (604) is fixedly connected to the furnace door 1 (7). The pump body 1 (601) is connected to one side of the cavity 1 (201) through a pipe, and the pump body 2 (602) is connected to the other side of the cavity 1 (201) through a pipe.

4. The in-furnace annealing device for implantable stainless steel materials according to claim 3, characterized in that: The second push assembly includes a pump body four (1901) fixedly connected to the support frame (1), a pump body five (1902) fixedly connected to the support frame (1), two solenoid valves two (1903) respectively slidably connected in the cavity two (1801), and a telescopic rod two (1904) fixedly connected to the solenoid valve two (1903). The telescopic rod two (1904) is fixedly connected to the furnace door two (20). The pump body four (1901) is connected to one side of the cavity two (1801) through a pipe, and the pump body five (1902) is connected to the other side of the cavity two (1801) through a pipe.

5. The in-furnace annealing device for implantable stainless steel materials according to claim 4, characterized in that: The mounting shaft (8) is provided with an inner cavity (801), an outer cavity (802) and a docking hole (803). A piston rod (11) is slidably connected in the inner cavity (801). A pusher plate (12) is fixedly connected to the end of the piston rod (11) away from the annealing furnace (3). Several push rods (13) arranged in a circular array are fixedly connected on the pusher plate (12). The push rods (13) are slidably connected to the furnace door (7). Several sliding sleeves (9) are fixedly connected in the outer cavity (802). A limit key (10) is slidably connected in the sliding sleeves (9). A pump body (14) is fixedly connected in the furnace door (7). An oil channel is provided in the telescopic rod (604). The oil channel is controlled by a solenoid valve (603). The pump body (14) is connected to the oil channel of the sliding sleeves (9), the inner cavity (801) and the telescopic rod (604) in sequence through a pipe.

6. The in-furnace annealing device for implantable stainless steel materials according to claim 5, characterized in that: Mounting bracket (15) is fitted on mounting shaft 1 (8). Mounting bracket (15) has a mounting through hole (1501) at its center that matches the size of mounting shaft 1 (8). Mounting bracket (15) has several push holes (1502) on its end face that match the size of push rod (13). Mounting bracket (15) has several limiting grooves (1503) on its rod body that match the size of limiting key 1 (10). Mounting bracket (15) is axially positioned by locking the limiting key 1 (10) into the limiting groove (1503). Mounting bracket (15) has several feeding cylinders (16) installed on it.

7. The in-furnace annealing device for implantable stainless steel materials according to claim 6, characterized in that: The mounting shaft 2 (21) has an inner cavity 2 (2101) and an outer cavity 2 (2102). A piston rod 2 (24) is slidably connected in the inner cavity 2 (2101). A positioning column (25) is fixedly connected to one end of the piston rod 2 (24) near the fast cooling furnace (5). A stress sensor (26) is fixedly connected in the positioning column (25). The stress sensor (26) is used to detect the pressure value when in contact with the docking hole (803) and feed it back to the control system. The outer cavity 2 (2101) 02) Several sliding sleeves (22) are fixedly connected inside. Limit key (23) is slidably connected inside the sliding sleeves (22). Pump body (27) is fixedly connected inside the furnace door (20). Oil channel (2) is provided inside the telescopic rod (1904). The oil channel is controlled by solenoid valve (1903). Pump body (27) is connected to the oil channel (2) of sliding sleeve (22), inner cavity (2101) and telescopic rod (1904) in sequence through pipes.

8. The in-furnace annealing device for implantable stainless steel materials according to claim 7, characterized in that: The bottom of the fast cooling furnace (5) is provided with a chip discharge port (502), and the second platform (18) is provided with a slot (1802). The chip discharge port (502) and the slot (1802) are connected, and a chip collection box (35) is installed in the slot (1802).

9. A method for in-furnace annealing of implantable medical stainless steel materials, characterized in that: The steps of using the in-furnace annealing apparatus for implantable stainless steel materials as described in claim 8 include: S1: Workpiece installation, start pump body one (601) to send oil into cavity one (201), push solenoid valve one (603) and telescopic rod one (604) to extend outward, so that furnace door one (7) is fully opened, and the mounting bracket (15) containing the workpiece to be annealed is sleeved on mounting shaft one (8) through mounting through hole (1501); S2: After the furnace door (7) is fully opened, the solenoid valve (603) is opened, the telescopic rod (604) is inlet, and the pump body (14) provides power to first send oil into the oil inlet of the sliding sleeve (9), push out the limit key (10) into the limit groove (1503) of the mounting bracket (15) to achieve axial positioning of the mounting bracket (15), and the oil then flows into the inner cavity (801) to push out the piston rod (11). The piston rod (11) drives the push plate (12) and push rod (13) to move outward to complete the fixing of the mounting bracket (15). After the fixing is completed, the solenoid valve (603) is closed, and then the pump body (602) is started to push the telescopic rod (604) inward to close the furnace door (7) and the annealing furnace (3). S3: Start the vacuum pump (17) to evacuate the annealing furnace (3). After evacuation, start the annealing furnace (3) to heat and anneal the workpiece according to the preset annealing curve. S4: After annealing, start the vacuum pump (33) to extract the gas in the rapid cooling furnace (5) to balance the gas pressure in the annealing furnace (3) and the rapid cooling furnace (5). The extracted gas is filtered through the filter screen (32) and discharged through the exhaust port (3401). After balancing, open the vacuum valve gate (4). S5: After the vacuum valve gate (4) is opened, start pump body five (1902), solenoid valve two (1903) is opened, and oil enters inner cavity two (2101) through the pipes of telescopic rod two (1904) and pump body six (27), pushing out piston rod two (24), positioning column (25) and stress sensor (26). Then the oil enters the oil outlet of sliding sleeve two (22), pushing limit key two (23) to retract into sliding sleeve two (22), positioning column (25) extends out and docks with the docking hole (803) of mounting shaft one (8) to achieve guide connection. Stress sensor (26) detects docking pressure value in real time and feeds it back to control system. S6: Start pump body two (602), solenoid valve one (603) opens, the oil flow direction is opposite to the flow direction of platform one (2) in S2, causing limit key one (10) to retract into sliding sleeve one (9), and at the same time pushing piston rod one (11) to move inward, driving push plate (12) and push rod (13) to push inward. Push rod (13) pushes mounting bracket (15) from mounting shaft one (8) to mounting shaft two (21) through push hole (1502). After the transfer is completed, the oil flow direction is opposite to the flow direction of fast cooling furnace (5) in S5, causing limit key two (23) to extend out of sliding sleeve two (22), positioning column (25) to retract, and then close vacuum valve gate (4). S7: After closing the vacuum valve gate (4), start the inert gas reactor (28). The inert gas is injected into the fast cooling furnace (5) through the main conveying pipe (29) and the jet nozzle (30) to cool the workpiece quickly. The cooling gas is filtered through the filter screen (32) in the top shell (31) and discharged through the exhaust port (3401) of the three-way valve (34). S8: When there are too many impurities in the filter screen (32), backflushing is performed. The inert gas reactor (28) backflushes into the top shell (31) through the air inlet (3402) to clean the filter screen (32). The fallen debris falls into the debris collection box (35). The debris collection box (35) is periodically removed for cleaning.

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