A controlled atmosphere heat treatment device for planetary pin shaft heating in a wind turbine gearbox

Abstract

This invention discloses a well-type controlled atmosphere heat treatment device for planetary pin shafts in wind turbine gearboxes, including a base frame. A heating furnace body is fixedly mounted on the top of the base frame via a fixing block. This invention relates to the field of heat treatment technology. This well-type controlled atmosphere heat treatment device for planetary pin shafts in wind turbine gearboxes utilizes an integrated atmosphere control structure with annular distributed air intake, coordinated air distribution via vertical air pipes and a cylindrical cylinder, and automatic switching between high and low pressure modes. This achieves uniform diffusion of nitrogen from top to bottom and from inside to outside throughout the furnace chamber, completely eliminating dead zones in gas flow. It can quickly expel air and water vapor from the top exhaust port, effectively preventing oxidation, decarburization, and surface color differences in the planetary pin shafts during heating, significantly improving the surface quality and microstructure uniformity after heat treatment. Simultaneously, relying on the automatic switching logic of high-pressure rapid oxygen removal and low-pressure uniform protection, nitrogen consumption is reduced while ensuring protection effectiveness.

Description

Technical Field

[0001] This invention relates to the field of heat treatment technology, specifically to a well-type controlled atmosphere heat treatment device for planetary pin shafts of wind turbine gearboxes. Background Technology

[0002] As the core transmission component of wind turbine generators, the operational reliability of the gearbox directly determines the service life of the entire unit. Planetary pins, as key load-bearing components in planetary transmission systems, endure alternating and impact loads over long periods, placing extremely high demands on the uniformity of microstructure, surface quality, and deformation control after heat treatment. Pit-type heating furnaces, due to their suitability for vertical loading of shaft parts and minimal heating deformation, have become the mainstream equipment for planetary pin heat treatment. However, traditional equipment has significant shortcomings in atmosphere control, gas distribution, oxygen content monitoring, and exhaust logic, such as: 1. Traditional pit furnaces mostly use single-point top or bottom air intake, and the protective gases such as nitrogen are unevenly distributed in the furnace chamber, which easily leads to local gas dead zones, resulting in oxidation, decarburization and color difference on the surface of planetary pins, which cannot meet the requirements of oxidation-free heat treatment for wind power parts. 2. There is no segmented switching mechanism for air intake flow and pressure. Heating and impurity removal and heat preservation protection share the same gas supply mode, which not only wastes protective gas, but also makes it difficult to quickly vent the air and water vapor in the furnace, prolonging the process cycle and making the protection effect unstable. 3. The exhaust port is not set up properly. Most of them are normally open straight exhaust, which cannot be matched with the intake rhythm to form a stable micro positive pressure. External air is easy to backflow. At the same time, the exhaust gas carries high temperature waste heat that is not properly utilized, which poses safety hazards and energy loss. 4. The lack of real-time oxygen content monitoring linked to the air intake logic makes it impossible to accurately determine the air venting point in the furnace. It relies on manual experience for control, resulting in poor consistency of heat treatment quality and difficulty in meeting the needs of mass production and high stability of wind power planetary pin shafts.

[0003] Therefore, a wind turbine gearbox planetary pin shaft well-type controlled atmosphere heat treatment device is designed to meet the comprehensive requirements of uniform gas coverage, rapid venting, stable micro-positive pressure, and accurate atmosphere monitoring, in order to solve these defects. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a well-type controlled atmosphere heat treatment device for planetary pin shafts in wind turbine gearboxes, which solves the problem of uneven distribution of protective gas in existing heating furnaces, which easily leads to a decline in component quality.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a controllable atmosphere heat treatment device for planetary pin shaft heating in a wind turbine gearbox, comprising a base frame, a heating furnace body fixedly mounted on the top of the base frame via a fixing block, a polygonal inner frame fixedly mounted on the bottom of the inner cavity of the heating furnace body, a circular guide ring groove opened on the top of the polygonal inner frame, a cylindrical cylinder slidably mounted on the inner side of the circular guide ring groove, a rectangular nozzle opened on the surface of the cylindrical cylinder, and a plurality of rectangular nozzles are provided, a sloping expansion frame fixedly mounted on the bottom of the cylindrical cylinder, and a gas guide vertical pipe fixedly mounted on the edge side of the top of the polygonal inner frame through an opening, the bottom end of the gas guide vertical pipe having a bent pipe portion for use in conjunction with the sloping expansion frame.

[0006] Preferably, the surface of the air guide vertical pipe and the upper part of the polygonal inner frame are provided with a circular spray hole, and a plurality of circular spray holes are provided. The top end of the air guide vertical pipe is fixedly connected to a connected polygonal outer pipe.

[0007] Preferably, a gas-blocking sleeve is slidably installed on the surface of the gas guide vertical pipe. The surface of the gas-blocking sleeve is provided with a gas-leaking square opening that cooperates with the circular spray hole, and the number of gas-leaking square openings is the same as that of the circular spray hole. A supporting base frame that cooperates with the cylindrical tube is fixedly connected between the bottom ends of several gas-blocking sleeves through a bracket. A container rack is fixedly installed between the two sides of the inner cavity of the heating furnace body.

[0008] Preferably, both sides of the rear of the base plate frame are provided with guide grooves extending to the front. A U-shaped skateboard frame is slidably installed on the inner side of the guide groove. A first cylinder is fixedly installed at the bottom of the base plate frame by a bracket, and the front end of the first cylinder is fixedly connected to the U-shaped skateboard frame by a fixing block. A circular groove is provided at the top of the U-shaped skateboard frame and on the outside of the base plate frame.

[0009] Preferably, a circular rotating shaft seat is rotatably installed on the inner side of the circular rotating groove, a cylindrical vertical frame is fixedly connected to the top of the circular rotating shaft seat, a second cylinder is fixedly connected to the inner side of the cylindrical vertical frame, an upper pressure frame is fixedly connected to the top of the second cylinder, and a sealing cover that cooperates with the heating furnace body is fixedly connected to the bottom of the upper pressure frame through a fixing block.

[0010] Preferably, the bottom of the sealing cap is provided with an exhaust port, the top of the sealing cap is fixedly installed with a duct that communicates with the exhaust port through an opening, the top of the duct is fixedly installed with an exhaust pipe through an opening, and an oxygen monitor is fixedly installed on one side of the duct through an opening.

[0011] Preferably, an annular air frame is fixedly installed on the top of the sealing cap and on the outer periphery of the air guide tube by a bracket. A round tube is fixedly connected to the bottom of the annular air frame by opening, and several round tubes are arranged in a ring. An air supply pipe is fixedly installed on the rear side of the top of the annular air frame by opening.

[0012] Preferably, the bottom end of the round tube passes through the sealing cap and extends to the bottom of the sealing cap, and the end of the round tube extending to the bottom of the sealing cap is fixedly connected to a polygonal inner tube that cooperates with the polygonal outer tube.

[0013] This invention provides a well-type controlled atmosphere heat treatment device for planetary pin shafts in wind turbine gearboxes. Compared with existing technologies, it has the following advantages: (1) The well-type controlled atmosphere heat treatment device for planetary pin shafts of wind turbine gearboxes has an integrated atmosphere control structure with annular distributed air intake, gas distribution through the linkage of gas guide vertical pipe and cylindrical cylinder, and automatic switching between high and low pressure modes. This enables nitrogen to diffuse evenly from top to bottom and from inside to outside in the furnace, completely eliminating dead zones in gas flow. It can quickly squeeze out air and water vapor in the furnace from the top exhaust port, effectively avoiding oxidation, decarburization and surface color difference defects of planetary pin shafts during heating. This significantly improves the surface quality and uniformity of the structure after heat treatment. At the same time, relying on the automatic switching logic of high pressure rapid oxygen removal and low pressure uniform protection, it reduces nitrogen consumption and optimizes gas utilization efficiency while ensuring protection effect, thus meeting the high-precision and low-cost heat treatment requirements of wind turbine planetary pin shafts.

[0014] (2) The wind turbine gearbox planetary pin shaft well-type heating controllable atmosphere heat treatment device organically combines the three elements of integrating the exhaust port into the sealing cover, real-time detection with an oxygen monitor, and micro-positive pressure self-balancing exhaust. The exhaust position is highly matched with the nitrogen floating path, which can quickly remove the waste gas in the furnace, stably maintain the micro-positive pressure state in the furnace and prevent air backflow. The oxygen monitor can accurately identify the air venting node and realize automatic switching of the gas supply mode, get rid of the dependence on manual experience, and greatly improve the stability and controllability of the heat treatment process. At the same time, the high temperature waste gas is discharged in an orderly manner through the gas guide pipe, reducing the safety risk of direct emission. The overall structure is compact and has strong linkage, which is compatible with miniaturized well-type heating equipment and effectively improves the automation level and production reliability of wind turbine planetary pin shaft heat treatment. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a bottom view of the base plate frame, U-shaped slide frame, and first cylinder structure of the present invention; Figure 3 This is a cross-sectional view of the heating furnace body structure of the present invention; Figure 4This is a schematic diagram of the guide groove, U-shaped slide frame, and circular rotating groove structure of the present invention; Figure 5 This is a schematic diagram of the polygonal outer tube, air-blocking sleeve, and shelf structure of the present invention. Figure 6 For the present invention Figure 5 A magnified view of a section at point A in the middle; Figure 7 This is a schematic diagram of the air-blocking sleeve, the air-leaking square opening, and the supporting base structure of the present invention. Figure 8 This is a cross-sectional view of the polygonal inner frame structure of the present invention; Figure 9 This is a schematic diagram of the circular guide ring groove, cylindrical tube, rectangular nozzle, and inclined expansion frame structure of the present invention. Figure 10 This is a schematic diagram of the upper pressure frame, sealing cover, and exhaust port structure of the present invention; Figure 11 This is a cross-sectional view of the sealing cap, exhaust port, and air duct structure of the present invention.

[0016] In the diagram: 1. Base plate frame; 2. Heating furnace body; 3. Polygonal inner frame; 4. Circular guide ring groove; 5. Cylindrical tube; 6. Rectangular nozzle; 7. Sloping expansion frame; 8. Gas guide vertical pipe; 9. Bend section; 10. Circular nozzle; 11. Polygonal outer pipe; 12. Gas-blocking sleeve; 13. Leakage square port; 14. Supporting base frame; 15. Container rack; 16. Guide slide groove; 17. U-shaped sliding plate frame; 18. First cylinder; 19. Circular rotating groove; 20. Circular rotating shaft seat; 21. Cylindrical vertical frame; 22. Second cylinder; 23. Upper pressure frame; 24. Sealing cover; 25. Exhaust port; 26. Gas guide pipe; 27. Oxygen monitor; 28. Exhaust pipe; 29. ​​Annular gas frame; 30. Circular through pipe; 31. Polygonal inner pipe; 32. Gas transmission pipe. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figures 1-11This invention provides a technical solution: a well-type controlled atmosphere heat treatment device for planetary pin shafts of wind turbine gearboxes, comprising a base frame 1, a heating furnace body 2 fixedly mounted on the top of the base frame 1 by a fixing block, the heating furnace body 2 being a well-type vertical cylindrical structure, the furnace lining being constructed with high-temperature resistant insulation material, possessing good heat insulation and heat preservation performance, a polygonal inner frame 3 fixedly mounted on the bottom of the inner cavity of the heating furnace body 2, a circular guide ring groove 4 being opened on the top of the polygonal inner frame 3, and a cylindrical cylinder 5 slidably mounted on the inner side of the circular guide ring groove 4. The surface of the cylindrical tube 5 is provided with rectangular nozzles 6, and there are several rectangular nozzles 6. The bottom of the cylindrical tube 5 is fixedly installed with an inclined expansion frame 7. The inclined expansion frame 7 has an upwardly expanding conical structure, which is used to receive the airflow impact and drive the cylindrical tube 5 to float. The top edge of the polygonal inner frame 3 is fixedly installed with a gas guide vertical pipe 8 through an opening. The bottom end of the gas guide vertical pipe 8 is provided with a bent pipe section 9 that cooperates with the inclined expansion frame 7. The outlet of the bent pipe section 9 faces the inclined expansion frame 7, so that the high-pressure nitrogen can accurately impact the inclined surface to achieve linkage lifting.

[0019] Furthermore, a circular nozzle 10 is provided on the surface of the air guide vertical pipe 8 and located at the upper part of the polygonal inner frame 3, and several circular nozzles 10 are provided. The top end of the air guide vertical pipe 8 is fixedly connected to a connected polygonal outer pipe 11. A gas blocking sleeve 12 is slidably installed on the surface of the air guide vertical pipe 8. A gas leakage square opening 13 is provided on the surface of the gas blocking sleeve 12 to cooperate with the circular nozzles 10, and the number of gas leakage square openings 13 is the same as that of the circular nozzles 10. The bottom ends of several gas blocking sleeves 12 are fixedly connected to a support base 14 to cooperate with the cylindrical tube 5 through a bracket. A holding rack 15 is fixedly installed between the two sides of the inner cavity of the heating furnace body 2. The holding rack 15 is a multi-layer or integral load-bearing structure, used to stably place the planetary pin shaft of the wind turbine gearbox, and ensure that the workpiece position is fixed and the heating is uniform during the heat treatment process.

[0020] The base plate frame 1 has guide grooves 16 extending to the front on both sides of the rear. A U-shaped skateboard frame 17 is slidably installed on the inner side of the guide grooves 16. A first cylinder 18 is fixedly installed at the bottom of the base plate frame 1 by a bracket. The front end of the first cylinder 18 is fixedly connected to the U-shaped skateboard frame 17 by a fixing block. A circular groove 19 is opened at the top of the U-shaped skateboard frame 17 and outside the base plate frame 1.

[0021] The inner side of the circular rotating groove 19 is rotatably mounted with a circular rotating shaft seat 20. The top of the circular rotating shaft seat 20 is fixedly connected to a cylindrical vertical frame 21. The inner side of the cylindrical vertical frame 21 is fixedly connected to a second cylinder 22. The top of the second cylinder 22 is fixedly connected to an upper pressure frame 23. The bottom of the upper pressure frame 23 is fixedly connected to a sealing cover 24 that works in conjunction with the heating furnace body 2 via a fixing block. The bottom of the sealing cover 24 is provided with a sealing ring groove and a high-temperature resistant sealing ring, which can fit tightly with the furnace opening to ensure the sealing effect inside the furnace.

[0022] The sealing cover 24 has an exhaust port 25 at its bottom. The top of the sealing cover 24 has an opening through which a gas guide pipe 26 connected to the exhaust port 25 is fixedly installed. The top of the gas guide pipe 26 has an opening through which an exhaust pipe 28 is fixedly installed. An oxygen monitor 27 is fixedly installed on one side of the gas guide pipe 26 through an opening. The oxygen monitor 27 is model TD100-SH-O2. The probe of the oxygen monitor 27 extends into the gas guide pipe 26 and can monitor the oxygen content of the exhaust gas in real time, accurately determining whether the air in the furnace has been emptied.

[0023] Among them, an annular air frame 29 is fixedly installed on the top of the sealing cap 24 and on the outer periphery of the air guide tube 26 by a bracket. A round tube 30 is fixedly connected to the bottom of the annular air frame 29 by opening. Several round tubes 30 are arranged in a ring. An air supply tube 32 is fixedly installed on the rear side of the top of the annular air frame 29 by opening.

[0024] The bottom end of the round tube 30 passes through the sealing cap 24 and extends to the bottom of the sealing cap 24. The end of the round tube 30 extending to the bottom of the sealing cap 24 is fixedly connected to a polygonal inner tube 31 that works with the polygonal outer tube 11. The polygonal inner tube 31 and the polygonal outer tube 11 are a plug-in sealing docking structure. After the cap is closed, a closed gas path is automatically formed to ensure that there is no leakage during the nitrogen delivery process.

[0025] In use, the operator places the planetary pin on top of the rack 15 from the top of the heating furnace body 2. Then, using the action of the circular pivot seat 20, the operator manually rotates the cylindrical vertical frame 21, causing the sealing cap 24 to turn to the front. Next, the first cylinder 18 is activated to pull the U-shaped sliding plate frame 17 and the sealing cap 24 forward until the sealing cap 24 is completely above the heating furnace body 2. Then, the second cylinder 22 is activated, using the upper pressure frame 23 to pull the sealing cap 24 down to align with the heating furnace body 2, until the sealing cap 24 is completely sealed and aligned with the heating furnace body 2. Finally, the heating furnace body is started. Body 2 heats the planetary pin shaft. At this time, the air pump injects nitrogen into the inner side of the annular air frame 29 through the air supply pipe 32. The nitrogen injection is high-pressure and high-speed. After entering the interior of the annular air frame 29, the nitrogen is dispersed by several round pipes 30, and then enters the guide vertical pipe 8 through the docking of the polygonal inner pipe 31 and the polygonal outer pipe 11. At this time, due to the high pressure and high speed of the nitrogen, a large amount of nitrogen will not be ejected from the round nozzle 10, but will directly enter the inner side of the polygonal inner frame 3, and then be ejected from the inclined expansion frame 7 through the guide of the bend pipe 9. When the inclined expansion frame 7 is impacted, it will push upwards, causing the rectangular nozzle 6 to be located in the polygonal... The upper part of the inner frame 3, and the rising of the cylindrical tube 5, supports the base frame 14, thereby causing the gas-blocking sleeve 12 to rise simultaneously, causing the leakage square port 13 to be misaligned with the gas-blocking sleeve 12. This allows the gas-blocking sleeve 12 to seal the circular nozzle 10, preventing nitrogen leakage. Subsequently, a large amount of nitrogen is ejected from the rectangular nozzle 6, and then the large amount of nitrogen pushes the oxygen upward from the bottom. The oxygen is pushed into the inside of the gas guide pipe 26 from the exhaust port 25, and then discharged from the exhaust pipe 28. At the same time, the oxygen monitor 27 monitors the oxygen content flowing inside the gas guide pipe 26 until the oxygen monitor 27 can no longer detect oxygen. When the nitrogen content is low, it indicates that the oxygen inside the furnace body 2 has been squeezed out. At this time, the operator controls the air pump to reduce the injection volume and pressure. The nitrogen pressure decreases, and the nitrogen sprayed from the bend 9 is insufficient to push the cylindrical cylinder 5 to continue rising. At this time, the cylindrical cylinder 5 and the supporting base 14 descend by their own weight, and the gas blocking sleeve 12 also descends simultaneously, so that the leakage square port 13 reconnects with the round spray hole 10. At this time, the nitrogen slowly overflows from several round spray holes 10. By injecting nitrogen at multiple points, the nitrogen wraps around the surface of the planetary pin from top to bottom, forming a protective barrier for the planetary pin and improving its protective properties.

[0026] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

Claims

1. A well-type controlled atmosphere heat treatment device for planetary pin shaft heating of a wind turbine gearbox, comprising a base plate frame (1), characterized in that: The top of the base plate frame (1) is fixedly installed with a heating furnace body (2) by a fixing block. A polygonal inner frame (3) is fixedly installed at the bottom of the inner cavity of the heating furnace body (2). A circular guide ring groove (4) is opened at the top of the polygonal inner frame (3). A cylindrical cylinder (5) is slidably installed on the inner side of the circular guide ring groove (4). A rectangular nozzle (6) is opened on the surface of the cylindrical cylinder (5), and there are several rectangular nozzles (6). A sloping expansion frame (7) is fixedly installed at the bottom of the cylindrical cylinder (5). A gas guide vertical pipe (8) is fixedly installed on the edge side of the top of the polygonal inner frame (3) by opening. A bent pipe part (9) is provided at the bottom end of the gas guide vertical pipe (8) to cooperate with the sloping expansion frame (7).

2. The wind turbine gearbox planetary pin shaft well-type controlled atmosphere heat treatment device according to claim 1, characterized in that: The surface of the air guide vertical pipe (8) and the upper part of the polygonal inner frame (3) are provided with a circular spray hole (10), and there are several circular spray holes (10). The top end of the air guide vertical pipe (8) is fixedly connected to a connected polygonal outer pipe (11).

3. The wind turbine gearbox planetary pin shaft well-type controlled atmosphere heat treatment device according to claim 2, characterized in that: A gas-blocking sleeve (12) is slidably installed on the surface of the gas guide vertical pipe (8). The surface of the gas-blocking sleeve (12) is provided with a gas-leaking square opening (13) that is used in conjunction with the circular spray hole (10). The number of gas-leaking square openings (13) is the same as the number of circular spray holes (10). A support base frame (14) that is used in conjunction with the cylindrical tube (5) is fixedly connected between the bottom ends of several gas-blocking sleeves (12) through a bracket. A container rack (15) is fixedly installed between the two sides of the inner cavity of the heating furnace body (2).

4. The wind turbine gearbox planetary pin shaft well-type controlled atmosphere heat treatment device according to claim 3, characterized in that: Both sides of the rear of the base plate frame (1) are provided with guide grooves (16) that extend to the front. A U-shaped slide frame (17) is slidably installed on the inner side of the guide groove (16). A first cylinder (18) is fixedly installed at the bottom of the base plate frame (1) by a bracket. The front end of the first cylinder (18) is fixedly connected to the U-shaped slide frame (17) by a fixing block. A circular groove (19) is provided on the top of the U-shaped slide frame (17) and outside the base plate frame (1).

5. The wind turbine gearbox planetary pin shaft well-type controlled atmosphere heat treatment device according to claim 4, characterized in that: A circular rotating shaft seat (20) is rotatably installed on the inner side of the circular rotating groove (19). A cylindrical vertical frame (21) is fixedly connected to the top of the circular rotating shaft seat (20). A second cylinder (22) is fixedly connected to the inner side of the cylindrical vertical frame (21). An upper pressure frame (23) is fixedly connected to the top of the second cylinder (22). A sealing cover (24) that cooperates with the heating furnace body (2) is fixedly connected to the bottom of the upper pressure frame (23) through a fixing block.

6. The wind turbine gearbox planetary pin shaft well-type controlled atmosphere heat treatment device according to claim 5, characterized in that: The bottom of the sealing cap (24) is provided with an exhaust port (25). The top of the sealing cap (24) is fixedly installed with a gas guide pipe (26) that is connected to the exhaust port (25) through an opening. The top of the gas guide pipe (26) is fixedly installed with an exhaust pipe (28) through an opening. An oxygen monitor (27) is fixedly installed on one side of the gas guide pipe (26) through an opening.

7. The wind turbine gearbox planetary pin shaft well-type controlled atmosphere heat treatment device according to claim 6, characterized in that: An annular air frame (29) is fixedly installed on the top of the sealing cap (24) and on the outer periphery of the air guide pipe (26) by a bracket. A round tube (30) is fixedly connected to the bottom of the annular air frame (29) by opening. Several round tubes (30) are arranged in a ring. An air supply pipe (32) is fixedly installed on the rear side of the top of the annular air frame (29) by opening.

8. The wind turbine gearbox planetary pin shaft well-type controlled atmosphere heat treatment device according to claim 7, characterized in that: The bottom end of the round tube (30) passes through the sealing cap (24) and extends to the bottom of the sealing cap (24). The end of the round tube (30) extending to the bottom of the sealing cap (24) is fixedly connected to a polygonal inner tube (31) that cooperates with the polygonal outer tube (11).

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