Cover type annealing furnace system adopting high-purity hydrogen protective atmosphere and process thereof

Abstract

The invention relates to the technical field of annealing furnaces, and discloses a bell-type annealing furnace system adopting a high-purity hydrogen protective atmosphere and a process thereof.The bell-type annealing furnace system adopting the high-purity hydrogen protective atmosphere comprises a furnace platform, an inner cover is arranged at the top of the furnace platform, and an outer cover is arranged at the position, located on the outer side of the inner cover, of the top of the furnace platform; a plurality of placing ring plates are uniformly arranged at the top of the furnace platform and positioned on the inner side of the inner cover in an overlapping manner; the device further comprises an air injection unit arranged on the furnace platform; and the air injection unit comprises a push-pull component arranged on the furnace platform. According to the bell-type annealing furnace system adopting the high-purity hydrogen protective atmosphere, a vertical cylinder of an air injection assembly drives a material storage box to rotate circumferentially, and the material storage box is driven to move in the radial direction in cooperation with a first-stage push-pull assembly and a second-stage push-pull assembly; meanwhile, the rotating assembly and the pushing assembly drive the nozzle to swing up and down, and a traditional flow field with the strong lower portion and the weak upper portion is thoroughly broken. Local high temperature or insufficient temperature is avoided, it is guaranteed that mechanical properties of all areas of the workpiece are consistent, and the product percent of pass is remarkably increased.

Description

Technical Field

[0001] This invention relates to the field of annealing furnace technology, and in particular to a bell-type annealing furnace system and process using a high-purity hydrogen protective atmosphere. Background Technology

[0002] In the field of high-end metal materials manufacturing, annealing is a core step in controlling the microstructure of materials and improving processing performance. Traditional bell-type annealing furnaces mostly use inert gases such as nitrogen for protection. While this can reduce oxidation, it has no reducing effect on the tiny oxide layers on the metal surface and is difficult to avoid surface quality defects caused by trace impurities. Therefore, it cannot meet the requirements of precision electronics, aerospace, and other fields for "zero oxidation and high cleanliness" of metal materials. With the increasing demand for materials such as ultra-thin steel strips and high-precision copper alloys, bell-type annealing furnace systems with high-purity hydrogen protective atmospheres are gradually being promoted. However, existing bell-type annealing furnaces with high-purity hydrogen protective atmospheres still have the following drawbacks during use: Existing bell-type annealing furnaces with a high-purity hydrogen protective atmosphere only have a single circulating fan at the bottom to drive gas flow. This easily leads to a non-uniform flow field within the furnace, characterized by a stronger flow at the bottom and a weaker flow at the top, causing an imbalance in the overall temperature distribution. Since hot gases naturally diffuse upwards, the single driving force of the bottom fan cannot break this pattern, resulting in a significant reduction in gas velocity and heat exchange efficiency in the upper part of the furnace. This temperature difference causes uneven heating of the stacked metal materials, not only causing the upper layer to fail to meet design standards for hardness, ductility, and other mechanical properties after annealing, but also potentially leading to material deformation and warping due to differences in thermal stress. This severely impacts product yield and fails to meet the stringent requirements for performance consistency in high-end metal processing.

[0003] The fan outlet creates a directional, concentrated, high-speed airflow. As this airflow continuously washes over specific areas of the metal material within the furnace along a fixed path, the kinetic energy of the airflow is converted into heat energy. Because the high-temperature gas cannot diffuse quickly, localized high-temperature accumulation zones gradually form. In these accumulation zones, the material experiences excessive temperature, leading to excessive grain growth in the microstructure, a significant decrease in mechanical properties, and even localized oxidation and discoloration. Meanwhile, the temperature in the surrounding areas does not meet the standards, resulting in insufficient annealing. Ultimately, this leads to significant performance differences in the same workpiece or batch of products, severely impacting product quality stability. Summary of the Invention

[0004] Given the existing technology's tendency to form a "strong bottom, weak top" flow field, where hot gas is difficult to diffuse evenly, resulting in low flow velocity and poor heat exchange in the upper and middle parts, uneven heating of the stacked metal layers, substandard performance, and easy deformation; in addition, the directional high-speed airflow from the fan outlet continuously washes over specific areas, forming local high-temperature accumulation, leading to overgrowth of material grains and performance degradation in these areas, while the surrounding areas are not annealed enough, ultimately affecting the product qualification rate and performance stability, a bell-type annealing furnace system using a high-purity hydrogen protective atmosphere is proposed.

[0005] This application provides a bell-type annealing furnace system using a high-purity hydrogen protective atmosphere. Its purpose is to achieve uniform circulation of the atmosphere inside the furnace, precise and controllable temperature field, ensure consistent heating of stacked metal materials, improve the stability and yield of product mechanical properties, and meet the needs of high-end metal processing.

[0006] The technical solution of the present invention is: a bell-type annealing furnace system using a high-purity hydrogen protective atmosphere, including a furnace platform, an inner cover provided on the top of the furnace platform, an outer cover provided on the top of the furnace platform outside the inner cover, and multiple placement ring plates uniformly stacked on the top of the furnace platform inside the inner cover, and also including a jetting unit provided on the furnace platform. The jet unit includes a push-pull component mounted on the furnace platform, a rotating component mounted on the push-pull component, a jet assembly mounted on the furnace platform, a pushing component mounted on the jet assembly, and a primary push-pull assembly and a secondary push-pull assembly mounted on the pushing component. The push-pull component allows the gas inside the inner cover to flow, heating the workpiece evenly, while the rotating component causes the jet assembly to oscillate back and forth to eject gas. The jet assembly includes a vertical cylinder mounted on the top of the furnace platform. Two storage boxes are symmetrically arranged on the vertical cylinder. Multiple nozzles are evenly distributed on the storage boxes. Connecting hoses are provided at the air inlets of the nozzles. Multiple sleeves are evenly distributed inside the storage boxes. The end of the connecting hose away from the nozzle extends to the inside of the storage box and communicates with the inside of the corresponding sleeve.

[0007] Furthermore, the pushing assembly includes a triangular plate disposed inside the vertical cylinder, and an electric push rod disposed at the top of the vertical cylinder, with the output end of the electric push rod fixedly connected to the triangular plate.

[0008] Furthermore, the primary push-pull assembly includes two symmetrically distributed primary push-pull rods mounted on the vertical cylinder. Each primary push-pull rod abuts against a corresponding storage box. Each of the two primary push-pull rods has a first U-shaped seat at its opposite end. A connecting shaft is provided inside the first U-shaped seat, and a roller is mounted on the connecting shaft. The roller is in rolling connection with the inclined side of the triangular plate.

[0009] Furthermore, the secondary push-pull assembly includes a secondary push-pull rod disposed within the primary push-pull rod, a secondary push-pull spring disposed between the secondary push-pull rod and the primary push-pull rod, the secondary push-pull spring being sleeved on the secondary push-pull rod, and a steel wire rope disposed on the secondary push-pull rod, the end of the steel wire rope away from the secondary push-pull rod passing through the first U-shaped seat and wound around the connecting shaft, and the secondary push-pull rod being fixedly connected to the corresponding storage box.

[0010] Furthermore, the rotating component includes a rotating assembly disposed on the storage box, and the rotating assembly is provided with a transmission assembly and a pushing assembly; The rotating assembly includes a second U-shaped seat mounted on the storage box. The nozzle is rotatably connected to the inner side of the corresponding second U-shaped seat via a rotating shaft. A drive wheel is mounted on the rotating shaft, and a belt is mounted on the drive wheel. A first insert rod is mounted at one end of the belt, and a second insert rod is mounted at the other end of the belt. Both the first insert rod and the second insert rod are slidably connected to the storage box.

[0011] Furthermore, the transmission assembly includes a transmission cylinder disposed between the first insert rod and the second insert rod. Both ends of the transmission cylinder are provided with inner rods, and the two inner rods are rotatably connected to the first insert rod and the second insert rod respectively. The storage box is also provided with a side plate, and the transmission cylinder is rotatably connected to the side plate.

[0012] Furthermore, the pushing assembly includes a fixed shaft disposed inside the sleeve, a fan blade disposed on the fixed shaft, a cam disposed on the fixed shaft, a pushing spring disposed between the first insert rod and the storage box, the pushing spring being sleeved on the first insert rod, and the cam abutting against the first insert rod.

[0013] Furthermore, it also includes a connecting component, which includes a connecting plate set on the furnace platform, a vertical cylinder fixedly connected to the connecting plate, a vertical rod set on the storage box, the vertical rod slidably connected to the connecting plate, and an L-shaped tube set between the storage box and the connecting plate.

[0014] Furthermore, it also includes an air supply assembly, which includes a movable cavity set on the furnace platform. A drive motor is installed inside the movable cavity, and a fan is installed on the output shaft of the drive motor. The fan and the connecting plate are fixedly connected by a mounting shaft. An L-shaped tube communicates with the inside of the movable cavity. An L-shaped hole is also provided on the furnace platform, which communicates with the inside of the movable cavity.

[0015] Another object of the present invention is to provide a bell-type annealing process using a high-purity hydrogen protective atmosphere, comprising the following steps: S1: The workpieces to be annealed are neatly stacked in layers on multiple placement ring plates inside the inner cover of the furnace platform to ensure that the workpieces are evenly placed. Then, the inner cover and outer cover are covered in sequence. The inside of the inner cover is evacuated by vacuum equipment to completely remove air, water vapor and other impurities, creating an oxidation-free basic environment for subsequent processes. S2: Open the solenoid butterfly valve to allow the nitrogen gas from the pressure reducing station to pass through the counterflow valve 1, filter, and flow meter 1 in sequence; at this time, the butterfly valve is closed, and the corresponding butterfly valve is opened by controlling the solenoid valve to purge the nitrogen gas into the furnace. After three times the furnace volume of nitrogen gas is introduced, the gas replacement in the furnace is completed. During this period, the hydrogen balloon valve remains closed. S3: Open the hydrogen balloon valve. High-purity hydrogen enters the hydrogen pipeline through the pressure reducing station, and then passes through the filter, flow meter 2, two-position three-way valve, and counterflow valve 2-way valve into the furnace until the set pressure is reached to form a protective atmosphere. Start the vertical cylinder to drive the storage box to rotate. With the rotation and up-and-down swing of the nozzle, the hydrogen evenly covers the workpiece to achieve uniform annealing. S4: After the workpiece heat treatment is completed, it enters the cooling stage. The hydrogen gas path is completely closed and the nitrogen gas path valve is fully opened. Nitrogen gas is introduced again to purge the furnace to avoid residual hydrogen affecting the quality of the workpiece during the cooling process. At the same time, the furnace temperature is accelerated until it drops to a safe range, thus completing the entire annealing process.

[0016] The beneficial effects of this invention are: The vertical cylinder of the jet assembly drives the storage box to rotate circumferentially. This, combined with the primary and secondary push-pull components, drives the storage box to move radially, allowing for flexible adjustment of the distance between the nozzle and the workpiece. Simultaneously, the rotating and pushing components cause the nozzle to oscillate up and down. Combined with the gas circulation design of the air supply component, this completely breaks the traditional "strong at the bottom, weak at the top" flow field. High-purity hydrogen forms a three-dimensional, uniform flow field, which, after fully integrating with heat, evenly covers the workpiece, avoiding localized high temperatures or insufficient temperatures. This ensures consistent mechanical properties across all areas of the workpiece, significantly improving product qualification rates.

[0017] The push assembly uses the airflow inside the sleeve to drive the fan blades to rotate, which in turn drives the cam to make the first insert slide back and forth. The nozzle can swing without additional power, reducing energy consumption. The air supply assembly drives the fan through the drive motor, so that the gas inside the inner cover forms a closed loop through the L-shaped hole and L-shaped tube, reducing heat loss and improving heat utilization efficiency.

[0018] By adjusting the radial movement of the storage box and the oscillation of the nozzle, it can adapt to the uniform annealing of layered stacked workpieces; in terms of process, a vacuum is first drawn and then hydrogen is introduced, with multiple protections to avoid safety hazards caused by the mixing of air and hydrogen. In addition, the transmission structure of each component is stable and reliable, easy to maintain, and improves the overall operational flexibility and safety of the equipment. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the bell-type annealing furnace system using a high-purity hydrogen protective atmosphere according to the present invention. Figure 2 This is a schematic diagram of the three-dimensional structure of the bell-type annealing furnace system using a high-purity hydrogen protective atmosphere of the present invention without the outer cover. Figure 3 This is a schematic diagram of the bell-type annealing furnace system of the present invention using a high-purity hydrogen protective atmosphere, with the outer and inner bells removed. Figure 4 This is a schematic diagram of the jet unit structure of the bell-type annealing furnace system using a high-purity hydrogen protective atmosphere according to the present invention. Figure 5 This is a cross-sectional structural diagram of the push-pull component of the bell-type annealing furnace system using a high-purity hydrogen protective atmosphere according to the present invention. Figure 6 This is a schematic diagram of the primary and secondary push-pull components of the bell-type annealing furnace system using a high-purity hydrogen protective atmosphere according to the present invention. Figure 7This is a schematic diagram of the rotating component structure of the bell-type annealing furnace system using a high-purity hydrogen protective atmosphere according to the present invention. Figure 8 This is a schematic diagram of the transmission components of the bell-type annealing furnace system using a high-purity hydrogen protective atmosphere according to the present invention. Figure 9 This is a schematic diagram of the rotating component structure of the bell-type annealing furnace system using a high-purity hydrogen protective atmosphere according to the present invention. Figure 10 This is a schematic diagram of the pusher assembly structure of the bell-type annealing furnace system using a high-purity hydrogen protective atmosphere according to the present invention. Figure 11 This is a schematic diagram of the connection components of the bell-type annealing furnace system using a high-purity hydrogen protective atmosphere according to the present invention. Figure 12 This is a schematic diagram of the air supply component of the bell-type annealing furnace system using a high-purity hydrogen protective atmosphere according to the present invention.

[0020] In the picture: 1. Furnace platform; 11. Inner cover; 12. Outer cover; 13. Placement ring plate; 2. Jet assembly; 21. Vertical cylinder; 22. Material storage box; 23. Nozzle; 24. Connecting hose; 25. Sleeve; 3. Push assembly; 31. Triangular plate; 32. Electric actuator; 4. First-stage push-pull assembly; 41. First-stage push-pull rod; 42. First U-shaped seat; 43. Connecting shaft; 44. Roller; 5. Second-stage push-pull assembly; 51. Second-stage push-pull rod; 52. Second-stage push-pull spring; 53. Steel wire rope; 6. 61. Rotating assembly; 62. Second U-shaped seat; 63. Drive wheel; 64. Belt; 65. First insert rod; 76. Second insert rod; 87. Transmission assembly; 71. Transmission cylinder; 72. Inner rod; 73. Side plate; 88. Pushing assembly; 81. Fixed shaft; 82. Fan blade; 83. Cam; 84. Pushing spring; 98. Connecting assembly; 91. Connecting plate; 92. Vertical rod; 93. L-shaped tube; 10. Air supply assembly; 101. Drive motor; 102. Fan; 103. L-shaped hole. Detailed Implementation

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0022] Example 1, referring to Figures 1-6The first embodiment of the present invention provides a bell-type annealing furnace system using a high-purity hydrogen protective atmosphere, including a furnace platform 1, an inner cover 11 covering the top of the furnace platform 1, an outer cover 12 covering the top of the furnace platform 1 outside the inner cover 11, and multiple placement ring plates 13 uniformly stacked on the top of the furnace platform 1 inside the inner cover 11. The system also includes a jetting unit mounted on the furnace platform 1; the jetting unit includes a push-pull component mounted on the furnace platform 1, a rotating component mounted on the push-pull component, a jetting assembly 2 mounted on the furnace platform 1, a pushing assembly 3 mounted on the jetting assembly 2, and a primary push-pull assembly mounted on the pushing assembly 3. 4 and secondary push-pull assembly 5; the push-pull component causes the gas inside the inner cover 11 to flow and heat the workpiece evenly, and the rotating component causes the jet assembly 2 to swing back and forth to spray gas; the jet assembly 2 includes a vertical cylinder 21 rotatably connected to the top of the furnace platform 1, two storage boxes 22 are symmetrically distributed and slidably connected on the vertical cylinder 21, multiple nozzles 23 are evenly distributed and rotatably connected on the storage box 22, a connecting hose 24 is fixedly connected to the air inlet of the nozzle 23, multiple sleeves 25 are evenly distributed and fixedly connected inside the storage box 22, and the end of the connecting hose 24 away from the nozzle 23 extends to the inside of the storage box 22 and communicates with the inside of the corresponding sleeve 25.

[0023] Specifically, the workpieces to be annealed are first neatly placed on multiple placement ring plates 13 inside the inner cover 11 at the top of the furnace platform 1, ensuring that the workpieces are stacked evenly in layers. Then, the inner cover 11 and the outer cover 12 are covered in sequence. The inside of the inner cover 11 is first evacuated to a vacuum using a vacuum device to remove impurities such as air and water vapor, so as to avoid oxidation of the workpieces during the subsequent annealing process. After the vacuum state is stable, high-purity hydrogen is then delivered into the inner cover 11 until the set pressure is reached to form a stable reducing protective atmosphere. The vertical cylinder 21 rotates stably around its axis at the top of the furnace platform 1, synchronously driving the two connected storage boxes 22 to perform circular motion. The nozzles 23 on the storage boxes 22 rotate with it. When the high-purity hydrogen gas in the storage boxes 22 is transported to the nozzles 23 through the sleeve 25 and the connecting hose 24, the rotating nozzles 23 will spray the gas toward the workpiece in a circular diffusion trajectory, breaking the limitation of the airflow in one direction. At the same time, the storage boxes 22 can slide up and down along the vertical cylinder 21, driving the nozzles 23 to move closer to or away from the workpiece, avoiding the nozzles 23 being fixed in a certain position and causing local airflow concentration. In addition, the nozzles 23 themselves can also rotate up and down, further expanding the gas spray coverage area, so that the high-purity hydrogen gas forms a three-dimensional and uniform flow field in the inner cover 11. This multi-dimensional airflow regulation method completely breaks the traditional "strong at the bottom and weak at the top" flow field pattern. High-purity hydrogen fully integrates with the heat in the furnace during the flow process and is evenly transferred to the surface of each workpiece layer. This avoids local high temperature accumulation and prevents the temperature from not meeting the standard. Ultimately, it ensures that all areas of the workpiece are heated evenly, achieves uniform annealing, and ensures the stability of the mechanical properties of the workpiece.

[0024] Reference Figure 5The pushing component 3 includes a triangular plate 31 slidably connected to the inside of the vertical cylinder 21, and an electric push rod 32 is fixedly connected to the top of the vertical cylinder 21. The output end of the electric push rod 32 is fixedly connected to the triangular plate 31.

[0025] Specifically, when the electric actuator 32 inside the vertical cylinder 21 is energized, its output end drives the triangular plate 31 to move up and down along the axis of the vertical cylinder 21. When the triangular plate 31 moves, the force is transmitted through the first-stage push-pull assembly 4, driving the two storage boxes 22 slidably connected to the vertical cylinder 21 to move synchronously. When the triangular plate 31 moves upward, the first-stage push-pull assembly 4 pulls the storage box 22 to retract away from the vertical cylinder 21; when the triangular plate 31 moves downward, the first-stage push-pull assembly 4 pushes the storage box 22 to expand towards the vertical cylinder 21. This controllable movement adjustment, combined with the rotation of the storage box 22 with the vertical cylinder 21 and the up-and-down swing of the nozzle 23 itself, allows the nozzle 23 to both rotate and spray air in a circular motion and flexibly adjust the distance from the workpiece, avoiding long-term concentration of airflow in a certain area, further optimizing the airflow distribution inside the inner cover 11, ensuring that high-purity hydrogen uniformly covers the workpiece, and improving the uniformity of annealing.

[0026] Reference Figure 6 The first-stage push-pull assembly 4 includes two symmetrically distributed first-stage push-pull rods 41 that are slidably connected to the vertical cylinder 21. The first-stage push-pull rods 41 abut against the corresponding storage box 22. The opposite ends of the two first-stage push-pull rods 41 are fixedly connected to a first U-shaped seat 42. A connecting shaft 43 is rotatably connected to the inner side of the first U-shaped seat 42. A roller 44 is fixedly connected to the connecting shaft 43. The roller 44 is in rolling connection with the inclined side of the triangular plate 31.

[0027] Specifically, the two hypotenuses of the triangular plate 31 roll into contact with the rollers 44 at the opposite ends of the two primary push-pull rods 41. As the position of the triangular plate 31 changes, its hypotenuses generate a lateral thrust on the rollers 44. Since the rollers 44 are rotatably connected to the inside of the first U-shaped seat 42 via the connecting shaft 43, and the first U-shaped seat 42 is fixedly connected to the primary push-pull rods 41, the rollers 44, when subjected to force, will drive the first U-shaped seat 42 to move horizontally, thereby pushing the primary push-pull rods 41 to slide synchronously. Because the first-stage push-pull rod 41 abuts against the storage box 22, and the storage box 22 is slidably connected to the vertical cylinder 21, the horizontal movement of the first-stage push-pull rod 41 will eventually be converted into the radial movement of the storage box 22. When the triangular plate 31 moves upward, the roller 44 rolls outward along the hypotenuse, pushing the storage box 22 closer to the vertical cylinder 21; when the triangular plate 31 moves downward, the roller 44 rolls inward, pulling the storage box 22 away from the vertical cylinder 21, thus achieving precise and controllable adjustment of the position of the storage box 22.

[0028] Reference Figure 6The secondary push-pull assembly 5 includes a secondary push-pull rod 51 slidably connected within the primary push-pull rod 41. A secondary push-pull spring 52 is fixedly connected between the secondary push-pull rod 51 and the primary push-pull rod 41. The secondary push-pull spring 52 is sleeved on the secondary push-pull rod 51. A steel wire rope 53 is also fixedly connected to the secondary push-pull rod 51. The end of the steel wire rope 53 away from the secondary push-pull rod 51 passes through the first U-shaped seat 42 and is wound around the connecting shaft 43. The secondary push-pull rod 51 is fixedly connected to the corresponding storage box 22.

[0029] Specifically, when the triangular plate 31 moves, the roller 44 rolls on the hypotenuse of the triangular plate 31, driving the connecting shaft 43 to rotate, thereby winding or unwinding the wire rope 53. When the wire rope 53 is wound up, it pulls the secondary push-pull rod 51, causing the secondary push-pull spring 52 to be compressed, which moves the storage box 22 toward the vertical cylinder 21. When the wire rope 53 is unwinding, it relaxes the secondary push-pull rod 51, the secondary push-pull spring 52 returns to its original position, and drives the secondary push-pull rod 51 away from the vertical cylinder 21, causing the storage box 22 to move away from the vertical cylinder 21.

[0030] Example 2, refer to Figures 7-10 This is the second embodiment of the present invention, which differs from the first embodiment in that: the rotating component includes a rotating assembly 6 mounted on the storage box 22, and a transmission assembly 7 and a pushing assembly 8 are mounted on the rotating assembly 6; the rotating assembly 6 includes a second U-shaped seat 61 fixedly connected to the storage box 22, and the nozzle 23 is rotatably connected to the inner side of the corresponding second U-shaped seat 61 via a rotating shaft, a drive wheel 62 is fixedly connected to the rotating shaft, a belt 63 is sleeved on the drive wheel 62, a first insert rod 64 is fixedly connected to one end of the belt 63, and a second insert rod 65 is fixedly connected to the other end of the belt 63, and both the first insert rod 64 and the second insert rod 65 are slidably connected to the storage box 22.

[0031] Specifically, when the first insert rod 64 slides, it pulls one end of the belt 63, causing the belt 63 to move. As the belt 63 moves, it drives the drive wheel 62 to rotate, which in turn drives the nozzle 23 to rotate via the rotating shaft, causing the nozzle 23 to swing up and down. When the belt 63 is pulled, it causes the second insert rod 65 to slide, and the second insert rod 65 guides the belt 63.

[0032] Reference Figures 7-9 The transmission assembly 7 includes a transmission cylinder 71 rotatably connected between the first insert rod 64 and the second insert rod 65. Both ends of the transmission cylinder 71 are slidably connected to inner rods 72. The two inner rods 72 are rotatably connected to the first insert rod 64 and the second insert rod 65 respectively. A side plate 73 is also fixedly connected to the storage box 22. The transmission cylinder 71 is rotatably connected to the side plate 73.

[0033] Specifically, when the first insert rod 64 slides, it drives the inner rod 72 to move, causing the inner rod 72 to slide inside the transmission cylinder 71, which in turn drives the inner rod 72 to rotate, causing the transmission cylinder 71 to rotate on the side plate 73, which in turn drives the other inner rod 72 to rotate, causing the second insert rod 65 to slide, so that the first insert rod 64 and the second insert rod 65 slide up and down, so that the belt 63 is driven at a constant speed.

[0034] Reference Figures 7-9 The pushing assembly 8 includes a fixed shaft 81 rotatably connected to the inside of the sleeve 25, a fan blade 82 fixedly connected to the fixed shaft 81, a cam 83 fixedly connected to the fixed shaft 81, a pushing spring 84 fixedly connected between the first insert rod 64 and the storage box 22, the pushing spring 84 being sleeved on the first insert rod 64, and the cam 83 abutting against the first insert rod 64.

[0035] Specifically, when the gas in the storage box 22 enters the sleeve 25, the gas causes the fan blade 82 to rotate, which in turn drives the fixed shaft 81 to rotate. This causes the cam 83 to rotate as well, compressing the first insert rod 64 and causing it to slide, thus compressing the push spring 84. As the cam 83 continues to rotate, the first insert rod 64 slides back and forth under the action of the push spring 84. The remaining structure is the same as in Embodiment 1.

[0036] Example 3, referring to Figure 11 This is the third embodiment of the present invention. The difference between this embodiment and the second embodiment is that it also includes a connecting component 9. The connecting component 9 includes a connecting plate 91 rotatably connected to the furnace platform 1, a vertical cylinder 21 fixedly connected to the connecting plate 91, a vertical rod 92 fixedly connected to the storage box 22, the vertical rod 92 slidably connected to the connecting plate 91, and an L-shaped tube 93 fixedly connected between the storage box 22 and the connecting plate 91.

[0037] Specifically, the connecting plate 91 rotates, causing the vertical cylinder 21 to rotate, and the vertical rod 92 slides on the connecting plate 91, causing the storage box 22 to slide closer to or further away from the vertical cylinder 21. Gas enters the storage box 22 through the L-shaped tube 93.

[0038] Reference Figure 12 It also includes an air supply assembly 10, which includes a movable cavity set on the furnace platform 1. A drive motor 101 is set inside the movable cavity. A fan 102 is set on the output shaft of the drive motor 101. The fan 102 is fixedly connected to the connecting plate 91 through a mounting shaft. An L-shaped tube 93 communicates with the inside of the movable cavity. An L-shaped hole 103 is also set on the furnace platform 1, which communicates with the inside of the movable cavity.

[0039] Specifically, the drive motor 101 is started, which drives the fan 102 to rotate. Through the mounting shaft, the connecting plate 91 rotates, sending the gas in the movable chamber into the L-shaped tube 93 and into the storage box 22. The gas in the inner cover 11 enters the movable chamber through the L-shaped hole 103, so that the gas in the inner cover 11 circulates and heats the workpiece. The rest of the structure is the same as that in Embodiment 2.

[0040] Based on embodiments 1-3, the working principle of this invention is as follows: First, the workpieces to be annealed are neatly placed in layers on the placement ring plate 13 inside the inner cover 11 of the furnace platform 1. After the inner cover 11 and the outer cover 12 are covered, a vacuum is drawn to remove impurities, and then high-purity hydrogen is introduced to form a protective atmosphere. The vertical cylinder 21 rotates around the axis of the furnace platform 1 under the drive of the connecting plate 91, synchronously driving the storage box 22 to move in a circular motion. The electric push rod 32 of the pushing component 3 drives the triangular plate 31 to move up and down, and its inclined side pushes the roller 44 of the first-stage push-pull component 4 to roll, so that the first-stage push-pull rod 41 drives the storage box 22 to move radially; at the same time, the connecting shaft 43 rotates to wind and unwind the steel wire rope 53, which, together with the second-stage push-pull spring 52, drives the second-stage push-pull rod 51 to extend and retract, further precisely adjusting the position of the storage box 22 and avoiding airflow concentration. The airflow inside the sleeve 25 drives the fan blade 82 to rotate, causing the cam 83 to press the first insert rod 64. Under the action of the push spring 84, the first insert rod 64 slides back and forth, driving the drive wheel 62 to rotate via the belt 63, causing the nozzle 23 to swing up and down. The transmission cylinder 71 and inner rod 72 of the transmission assembly 7 ensure that the first insert rod 64 and the second insert rod 65 slide synchronously, maintaining the uniform speed transmission of the belt 63. The drive motor 101 is started to drive the fan 102 to rotate, sending the gas in the active chamber into the storage box 22 through the L-shaped tube 93, and then spraying it out through the nozzle 23. The gas in the inner cover 11 flows back to the active chamber from the L-shaped hole 103, forming a closed loop circulation, which allows the high-purity hydrogen to fully integrate with the heat, uniformly covering the workpiece, breaking the defects of the traditional flow field, realizing uniform annealing of the workpiece, and ensuring stable mechanical properties.

[0041] Example 4, refer to Figures 1-12 The fourth embodiment of the present invention provides a bell-type annealing process using a high-purity hydrogen protective atmosphere, comprising the following steps: S1: The workpieces to be annealed are neatly stacked in layers on multiple placement ring plates 13 inside the inner cover 11 at the top of the furnace platform 1 to ensure that the workpieces are evenly placed. Then, the inner cover 11 and the outer cover 12 are covered in sequence. The inner cover 11 is evacuated into a vacuum by a vacuum device to completely remove air, water vapor and other impurities, so as to create an oxidation-free basic environment for subsequent processes. S2: Open the solenoid butterfly valve to allow the nitrogen gas from the pressure reducing station to pass through the counterflow valve 1, filter, and flow meter 1 in sequence; at this time, the butterfly valve is closed, and the corresponding butterfly valve is opened by controlling the solenoid valve to purge the nitrogen gas into the furnace. After three times the furnace volume of nitrogen gas is introduced, the gas replacement in the furnace is completed. During this period, the hydrogen balloon valve remains closed. S3: Open the hydrogen balloon valve. High-purity hydrogen enters the hydrogen pipeline through the pressure reducing station, and then passes through the filter, flow meter 2, two-position three-way valve, and counterflow valve 2-way valve into the furnace until the set pressure is reached to form a protective atmosphere. Start the vertical cylinder 21 to drive the storage box 22 to rotate. In conjunction with the rotation and up-and-down swing of the nozzle 23, the hydrogen is evenly covered on the workpiece to achieve uniform annealing. S4: After the workpiece heat treatment is completed, it enters the cooling stage. The hydrogen gas path is completely closed and the nitrogen gas path valve is fully opened. Nitrogen gas is introduced again to purge the furnace to avoid residual hydrogen affecting the quality of the workpiece during the cooling process. At the same time, the furnace temperature is accelerated until it drops to a safe range, thus completing the entire annealing process.

[0042] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A bell-type annealing furnace system employing a high-purity hydrogen protective atmosphere, comprising a furnace platform (1), an inner cover (11) disposed on the top of the furnace platform (1), an outer cover (12) disposed on the top of the furnace platform (1) outside the inner cover (11), and a plurality of placement ring plates (13) uniformly stacked on the top of the furnace platform (1) inside the inner cover (11), characterized in that, It also includes a jetting unit installed on the furnace platform (1); The jet unit includes a push-pull component set on the furnace platform (1), a rotating component set on the push-pull component, and a jet assembly (2) set on the furnace platform (1). The jet assembly (2) is equipped with a push assembly (3), and the push assembly (3) is equipped with a first-level push-pull assembly (4) and a second-level push-pull assembly (5). The push-pull component causes the gas inside the inner cover (11) to flow and heat the workpiece evenly, while the rotating component causes the jet assembly (2) to swing back and forth to spray out gas. The jet assembly (2) includes a vertical cylinder (21) set on the top of the furnace platform (1). Two storage boxes (22) are symmetrically distributed on the vertical cylinder (21). Multiple nozzles (23) are evenly distributed on the storage boxes (22). A connecting hose (24) is provided at the air inlet of the nozzle (23). Multiple sleeves (25) are evenly distributed inside the storage box (22). The end of the connecting hose (24) away from the nozzle (23) extends to the inside of the storage box (22) and communicates with the inside of the corresponding sleeve (25).

2. The bell-type annealing furnace system using a high-purity hydrogen protective atmosphere as described in claim 1, characterized in that, The pushing component (3) includes a triangular plate (31) disposed inside the vertical tube (21), and an electric push rod (32) disposed on the top of the vertical tube (21). The output end of the electric push rod (32) is fixedly connected to the triangular plate (31).

3. The bell-type annealing furnace system using a high-purity hydrogen protective atmosphere according to claim 2, characterized in that, The first-stage push-pull assembly (4) includes two first-stage push-pull rods (41) symmetrically distributed on the vertical cylinder (21). The first-stage push-pull rods (41) abut against the corresponding storage box (22). The two first-stage push-pull rods (41) are provided with a first U-shaped seat (42) at their opposite ends. A connecting shaft (43) is provided on the inner side of the first U-shaped seat (42). A roller (44) is provided on the connecting shaft (43). The roller (44) is in rolling connection with the inclined side of the triangular plate (31).

4. The bell-type annealing furnace system using a high-purity hydrogen protective atmosphere according to claim 3, characterized in that, The secondary push-pull assembly (5) includes a secondary push-pull rod (51) disposed inside the primary push-pull rod (41). A secondary push-pull spring (52) is disposed between the secondary push-pull rod (51) and the primary push-pull rod (41). The secondary push-pull spring (52) is sleeved on the secondary push-pull rod (51). A steel wire rope (53) is also disposed on the secondary push-pull rod (51). The end of the steel wire rope (53) away from the secondary push-pull rod (51) passes through the first U-shaped seat (42) and is wound on the connecting shaft (43). The secondary push-pull rod (51) is fixedly connected to the corresponding storage box (22).

5. The bell-type annealing furnace system using a high-purity hydrogen protective atmosphere according to claim 1, characterized in that, The rotating component includes a rotating assembly (6) disposed on the storage box (22), and the rotating assembly (6) is provided with a transmission assembly (7) and a pushing assembly (8). The rotating assembly (6) includes a second U-shaped seat (61) disposed on the storage box (22). The nozzle (23) is rotatably connected to the inner side of the corresponding second U-shaped seat (61) via a rotating shaft. A drive wheel (62) is disposed on the rotating shaft. A belt (63) is disposed on the drive wheel (62). A first insert (64) is disposed at one end of the belt (63), and a second insert (65) is disposed at the other end of the belt (63). Both the first insert (64) and the second insert (65) are slidably connected to the storage box (22).

6. The bell-type annealing furnace system employing a high-purity hydrogen protective atmosphere according to claim 5, characterized in that, The transmission assembly (7) includes a transmission cylinder (71) disposed between the first insert (64) and the second insert (65). Both ends of the transmission cylinder (71) are provided with inner rods (72). The two inner rods (72) are rotatably connected to the first insert (64) and the second insert (65) respectively. The storage box (22) is also provided with a side plate (73). The transmission cylinder (71) is rotatably connected to the side plate (73).

7. The bell-type annealing furnace system using a high-purity hydrogen protective atmosphere according to claim 5, characterized in that, The pushing assembly (8) includes a fixed shaft (81) disposed inside the sleeve (25), a fan blade (82) disposed on the fixed shaft (81), a cam (83) disposed on the fixed shaft (81), a pushing spring (84) disposed between the first insert (64) and the storage box (22), the pushing spring (84) being sleeved on the first insert (64), and the cam (83) abutting against the first insert (64).

8. The bell-type annealing furnace system using a high-purity hydrogen protective atmosphere according to claim 1, characterized in that, It also includes a connecting component (9), which includes a connecting plate (91) set on the furnace platform (1), a vertical cylinder (21) fixedly connected to the connecting plate (91), a vertical rod (92) set on the storage box (22), the vertical rod (92) slidably connected to the connecting plate (91), and an L-shaped tube (93) set between the storage box (22) and the connecting plate (91).

9. The bell-type annealing furnace system using a high-purity hydrogen protective atmosphere according to claim 8, characterized in that, It also includes an air supply assembly (10), which includes an active cavity set on the furnace platform (1), a drive motor (101) is provided inside the active cavity, a fan (102) is provided on the output shaft of the drive motor (101), the fan (102) is fixedly connected to the connecting plate (91) by a mounting shaft, an L-shaped tube (93) is connected to the inside of the active cavity, and an L-shaped hole (103) is also provided on the furnace platform (1), which is connected to the inside of the active cavity.

10. A bell-type annealing process using a high-purity hydrogen protective atmosphere, applied to the bell-type annealing furnace system using a high-purity hydrogen protective atmosphere as described in any one of claims 1-8, characterized in that, Includes the following steps: S1: The workpieces to be annealed are neatly stacked in layers on multiple placement ring plates (13) on the inner side of the inner cover (11) at the top of the furnace platform (1) to ensure that the workpieces are evenly placed. Then, the inner cover (11) and the outer cover (12) are covered in sequence. The inner cover (11) is evacuated into a vacuum by a vacuum device to completely remove air, water vapor and other impurities, so as to create an oxidation-free basic environment for subsequent processes. S2: Open the solenoid butterfly valve to allow the nitrogen gas from the pressure reducing station to pass through the counterflow valve 1, filter, and flow meter 1 in sequence; at this time, the butterfly valve is closed, and the corresponding butterfly valve is opened by controlling the solenoid valve to purge the nitrogen gas into the furnace. After three times the furnace volume of nitrogen gas is introduced, the gas replacement in the furnace is completed. During this period, the hydrogen balloon valve remains closed. S3: Open the hydrogen balloon valve. High-purity hydrogen enters the hydrogen pipeline through the pressure reducing station. It passes through the filter, flow meter 2, two-position three-way valve, and counterflow valve 2-way valve in sequence into the furnace until the set pressure is reached to form a protective atmosphere. Start the vertical cylinder (21) to drive the storage box (22) to rotate. In conjunction with the rotation and up-and-down swing of the nozzle (23), the hydrogen is evenly covered on the workpiece to achieve uniform annealing. S4: After the workpiece heat treatment is completed, it enters the cooling stage. The hydrogen gas path is completely closed and the nitrogen gas path valve is fully opened. Nitrogen gas is introduced again to purge the furnace to avoid residual hydrogen affecting the quality of the workpiece during the cooling process. At the same time, the furnace temperature is accelerated until it drops to a safe range, thus completing the entire annealing process.

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