A large size gear heat treatment apparatus

Abstract

This invention relates to the field of heat treatment technology and discloses a large-size gear heat treatment equipment, including a base with a support at the end of the base. The support has a quenching liquid tank for holding coolant, and the equipment also includes a lifting and adjusting mechanism and a heat treatment mechanism. The heat treatment mechanism includes cooling nozzles located on both sides of the bottom of the quenching liquid tank, which spray coolant onto the gear surface. The lifting and adjusting mechanism includes a height-adjustable fixing plate above the quenching liquid tank, with a clamping assembly for holding the gear and a rotation drive assembly for driving the gear to rotate on the side of the fixing plate. This invention utilizes the gear's own lifting motion to achieve seamless switching between immersion cooling and spray cooling. Immersion first uniformly cools the entire gear teeth, reducing thermal stress, and then spraying forcibly breaks the vapor film at the tooth root, ensuring that the cooling rate at the tooth root meets the martensitic transformation requirements and completely solving the problem of insufficient tooth root hardening.

Description

Technical Field

[0001] This invention relates to the field of heat treatment technology, specifically to a heat treatment device for large-size gears. Background Technology

[0002] As a core component of mechanical transmission systems, gears directly determine the overall reliability and service life of the equipment. During meshing transmission, gear tooth surfaces endure repeated compressive stress and relative sliding friction, operating under harsh conditions. To meet the requirements of high tooth surface hardness to ensure wear resistance, while ensuring the core maintains strong and tough characteristics to resist impact loads, heat treatment has become an indispensable key process in gear manufacturing. Appropriate heat treatment can not only optimize the microstructure of the gear surface, achieving surface hardening and strengthening, but also effectively eliminate residual internal stresses from machining, stabilize component geometry and precision, thereby significantly improving the gear's ultimate load-bearing capacity and service life. Therefore, the level of heat treatment equipment and process control for gears has always been a key focus of technological research in the gear manufacturing industry.

[0003] In existing technologies, heat treatment equipment for large gears commonly employs induction heating to sequentially heat individual teeth or parts of the tooth surface to achieve rapid austenitization of the tooth profile. However, in the subsequent cooling and quenching stage, such equipment still primarily uses the traditional spray quenching method, which involves spraying cooling medium onto the heated tooth surface through a nozzle in a single direction to complete the cooling phase transformation. Due to the complex variable curvature geometry of gear tooth profiles, during spray cooling, the cooling medium jet impacts the protruding tooth tip area intensely and rapidly, resulting in extremely fast cooling at that location. Conversely, the tooth root area, being located in the recessed area shielded by adjacent teeth, experiences obstructed medium flow and low displacement efficiency, leading to a significantly slower cooling rate. This significant cooling rate gradient between the tooth tip and root caused by the single spray method easily induces high thermal and structural stresses within the hardened layer, resulting in quality defects such as tooth surface cracking, quenching distortion, and even discontinuity in the hardened layer at the tooth root. The aforementioned problems have become key bottlenecks restricting the application effect and quality stability of single-tooth induction hardening technology in the field of large-size gears, and there is an urgent need to improve the cooling structure of existing equipment. Summary of the Invention

[0004] This invention provides a heat treatment device for large-size gears, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A large-size gear heat treatment equipment includes a base, a support at the end of the base, a quenching liquid tank for containing coolant on the support, and a lifting adjustment mechanism and a heat treatment mechanism. The heat treatment mechanism includes cooling nozzles disposed on both sides of the bottom of the quenching liquid tank, the cooling nozzles being used to spray coolant onto the gear surface; The lifting and adjusting mechanism includes a fixed plate that is height-adjustably disposed above the quenching liquid tank, and a clamping assembly for clamping the gear and a rotary drive assembly for driving the gear to rotate are provided on the side of the fixed plate. When the gear descends to the lower limit with the fixed plate, one side of the gear is immersed in the coolant in the quenching liquid tank, and at this time the coolant level is higher than the nozzle height of the cooling nozzle. When the gear rises with the fixed plate and leaves the coolant, the coolant level is lower than the nozzle height of the cooling nozzle.

[0006] As a preferred embodiment of the present invention, the side wall of the quenching liquid tank is provided with an induction heater for heating a local tooth profile of the gear, and the side of the support is provided with a liquid level regulating component for adjusting the volume of the coolant in the quenching liquid tank. When the gear moves toward the support, the liquid level regulating component increases the volume of the coolant in the quenching liquid tank, and when the gear moves away from the support, the liquid level regulating component decreases the volume of the coolant in the quenching liquid tank.

[0007] As a preferred embodiment of the present invention, the liquid level regulating component includes a liquid storage cavity fixed to the side of the support, the liquid storage cavity being connected to the bottom of the quenching liquid tank through a connecting pipe, a piston being slidably and sealed inside the liquid storage cavity, a return spring being provided between the piston and the liquid storage cavity to force it to reset away from the connecting pipe, and a push rod being provided at the end of the piston away from the connecting pipe to engage with the gear.

[0008] As a preferred embodiment of the present invention, the fixing plate is vertically arranged, and a lifting drive assembly for driving the fixing plate to rise and fall is provided on the side opposite to the gear.

[0009] As a preferred embodiment of the present invention, the lifting drive assembly includes a lifting screw rotatably connected to the base, a fixing frame threaded onto the lifting screw and fixedly connected to the fixing plate, guide columns fixedly connected to the base on both sides of the fixing frame, and a drive device for driving the lifting screw to rotate on the base.

[0010] As a preferred embodiment of the present invention, the rotary drive assembly includes a drive shaft rotatably connected to the side of the fixed plate, a drive tooth for meshing with the gear is provided on the side of the drive shaft adjacent to the gear, and a drive motor for driving the drive shaft to rotate is provided on the fixed plate.

[0011] As a preferred embodiment of the present invention, the clamping assembly includes grooves formed on both sides of the fixed plate, a slider slidably connected in the groove, and a support roller for supporting the gear rotatably disposed on the side of the slider adjacent to the gear.

[0012] As a preferred embodiment of the present invention, the two slides are inclined toward the center of the fixed plate on the side near the base. A bearing seat is provided on the side of the fixed plate facing away from the gear. A clamping screw is rotatably connected in the bearing seat. A push block is threaded onto the clamping screw. One end of the push block is hinged to one end of the support plate. The other end of the support plate is hinged to the side of the slider through a rotating seat. A clamping motor for driving the clamping screw to rotate is provided on the fixed plate.

[0013] The present invention has the following advantages: 1. Automatic switching of cooling modes for excellent cooling effect: Seamless switching between immersion cooling and spray cooling is achieved by utilizing the lifting motion of the gears themselves. Immersion cooling first cools the entire gear teeth evenly, reducing thermal stress; then spray cooling forcibly breaks the vapor film at the tooth root, ensuring that the cooling rate at the tooth root meets the martensitic transformation requirements, completely solving the industry problem of insufficient tooth root hardening in traditional equipment.

[0014] 2. Simple structure and extremely high reliability: It eliminates the complex, easily damaged components such as the liftable sealing immersion tank and contour sealing strip found in traditional dip-spray composite devices. With no moving seals, there is no risk of quenching fluid leakage. Equipment maintenance costs are reduced, and the failure rate is significantly lowered.

[0015] 3. Automatic liquid level adjustment without additional power: The liquid level adjustment component automatically adjusts the liquid level in the quenching tank via gear movement, eliminating the need for an additional pump and valve system. The mechanical linkage between the return spring and piston provides rapid response, low energy consumption, and avoids electrical control delays.

[0016] 4. Stable clamping and good deformation control: The inclined sliding groove clamping assembly provides multi-point support for the gear through support rollers, resulting in uniform clamping force. The support rollers generate radial and axial forces simultaneously during clamping, which effectively prevents elliptical deformation of large gears due to their own weight during heat treatment, making it especially suitable for thin-walled gear rings.

[0017] 5. High production efficiency and wide applicability: Short single-tooth quenching cycle time and high indexing accuracy. By changing the drive gear, it can adapt to gears of different modules and diameters, and the lifting stroke is adjustable, making it suitable for the heat treatment needs of large-size gears and large gear rings.

[0018] 6. Cleaning and cooling work together for good surface quality: Before immersion cooling, the cooling nozzle pre-sprays liquid to remove oil stains from the tooth surface; during the liquid spraying cooling stage, the high-speed jet can wash away oxide scale and residual impurities, reducing subsequent cleaning processes and improving the surface finish of the tooth. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a large-size gear heat treatment equipment.

[0021] Figure 2 This is a right view of a large-size gear heat treatment equipment.

[0022] Figure 3 This is a schematic diagram of the lifting drive assembly in a large-size gear heat treatment equipment.

[0023] Figure 4 This is a schematic diagram of the structure of the front side of the fixed plate in a large-size gear heat treatment equipment.

[0024] Figure 5 This is a schematic diagram of the structure of the rear side of the fixed plate in a large-size gear heat treatment equipment.

[0025] Figure 6 This is a schematic diagram of the heat treatment mechanism in a large-size gear heat treatment equipment.

[0026] Figure 7 This is a schematic diagram of the internal structure of the quenching liquid tank in a large-size gear heat treatment equipment.

[0027] Figure 8 This is a schematic diagram of the structure of a large-size gear heat treatment equipment after the gear extends into the quenching liquid tank.

[0028] Figure 9 for Figure 8 The front view.

[0029] In the diagram: 1. Base; 2. Support; 3. Quenching liquid tank; 4. Heat treatment mechanism; 5. Gear; 6. Lifting and adjusting mechanism; 7. Drive device; 8. Guide column; 9. Lifting screw; 10. Fixed frame; 11. Lifting drive assembly; 12. Fixed plate; 13. Rotation drive assembly; 14. Clamping assembly; 15. Slide groove; 16. Support roller; 17. Slider; 18. Clamping motor; 19. Bearing seat; 20. Clamping screw; 21. Push block; 22. Support plate; 23. Rotating seat; 24. Drive shaft; 25. Drive gear; 26. Drive motor; 27. Induction heater; 28. Cooling nozzle; 29. ​​Liquid level adjustment assembly; 30. Liquid storage chamber; 31. Return spring; 32. Connecting pipe; 33. Piston; 34. Push rod; 35. Gear. Detailed Implementation

[0030] 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.

[0031] In one embodiment, see Figure 1 , Figure 2 and Figure 6 A large-size gear heat treatment device includes a base 1, which is welded from channel steel and steel plate, and its surface is aged to provide sufficient rigidity and stability to withstand the weight of the large-size gear 5 and the vibration load during the heat treatment process. A support 2 is vertically welded to the front end of the upper surface of the base 1, and a quenching liquid tank 3 is fixedly installed on the upper part of the support 2. The quenching liquid tank 3 is welded from stainless steel, and its inner wall is treated with anti-corrosion to withstand the corrosion of the quenching liquid for a long time. The device also includes a lifting and adjusting mechanism 6 and a heat treatment mechanism 4.

[0032] The heat treatment mechanism 4 includes cooling nozzles 28 located on the left and right sides of the bottom of the quenching liquid tank 3. The cooling nozzles 28 have a U-shaped structure, with their upper ends inclined towards the center of the quenching liquid tank 3. Multiple nozzles are evenly distributed on the upper surface of the cooling nozzles 28 from front to back. An induction heater 27 is located above the rear wall of the quenching liquid tank 3. The induction heater 27 uses a dual-frequency composite induction heating head, and its heating surface is designed to conform to the tooth profile of the gear 5, enabling uniform heating of the tooth tip, tooth surface, and tooth root.

[0033] The lifting and adjusting mechanism 6 is used to drive the gear 5 to move up and down, thereby switching the cooling mode. The lifting and adjusting mechanism 6 includes a fixed plate 12 and a lifting drive assembly 11. The fixed plate 12 is a vertically arranged thick steel plate, and its side facing away from the gear 5 (rear side) is connected to the lifting drive assembly 11, thereby realizing the up and down movement of the fixed plate 12. The side of the fixed plate 12 facing the gear 5 (front side) is provided with a clamping assembly 14 and a rotation drive assembly 13. The clamping assembly 14 is used to clamp and fix the gear 5, and while fixing the gear 5, it can also allow the gear 5 to rotate freely under the action of the rotation drive assembly 13.

[0034] When gear 5 descends to its lower limit with the fixing plate 12, the lower part of gear 5 is immersed in the coolant in the quenching liquid tank 3, and at this time the coolant level is higher than the nozzle height of the cooling nozzle 28. When gear 5 rises with the fixing plate 12 and leaves the coolant, the coolant level is lower than the nozzle height of the cooling nozzle 28. Specifically: when gear 5 descends into the quenching liquid tank 3, the coolant level rises due to the volume of coolant displaced by gear 5, providing pure immersion cooling for the lower part of gear 5; simultaneously, the cooling nozzle 28 at the bottom, being submerged in coolant, continuously sprays liquid, but is blocked by the liquid above, so the sprayed liquid mainly drives the flow of liquid inside the quenching liquid tank 3, thereby further improving the cooling effect. When gear 5 rises, the volume of coolant displaced by gear 5 decreases, the coolant level in the quenching liquid tank 3 drops, and the cooling nozzle 28 is exposed above the liquid surface. At this time, the water jet sprayed upwards from the cooling nozzle 28 directly sprays onto the surface of gear 5, achieving pure spray cooling.

[0035] In one instance of this embodiment, please refer to Figure 1 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 The support 2 has a level regulating component 29 on its side for adjusting the volume of coolant in the quenching liquid tank 3. The level regulating component 29 includes storage chambers 30 located on the left and right sides of the upper surface of the support 2. The bottom of the storage chambers 30 is connected to the bottom of the quenching liquid tank 3 via a connecting pipe 32, allowing coolant to flow between the storage chambers 30 and the quenching liquid tank 3. A piston 33 is slidably connected inside the storage chambers 30. A return spring 31 is located between the lower surface of the piston 33 and the bottom of the storage chamber 30, and the return spring 31 always pushes the piston 33 upwards. The lower end of a vertically arranged push rod 34 is fixedly connected to the middle of the upper surface of the piston 33, and the middle of the push rod 34 is slidably connected to the upper part of the storage chamber 30. When gear 5 disengages from push rod 34, piston 33 moves upward under the action of return spring 31, reducing the pressure below piston 33. This causes the liquid in quenching liquid tank 3 to be drawn into storage chamber 30 through connecting pipe 32, resulting in a rapid drop in the liquid level in quenching liquid tank 3. When gear 5 moves downward, it presses against push rod 34, pushing piston 33 downward, causing coolant in storage chamber 30 to flow back into quenching liquid tank 3 through connecting pipe 32, resulting in a rapid increase in the liquid level in quenching liquid tank 3. Therefore, when gear 5 descends, level adjustment component 29 can cause the liquid level in quenching liquid tank 3 to rise rapidly and with increased amplitude, allowing coolant to better submerge the lower part of gear 5; conversely, when gear 5 rises, the liquid level drops rapidly and with increased amplitude, causing cooling nozzle 28 to quickly emerge from the liquid surface, facilitating spray cooling of gear 5.

[0036] In one instance of this embodiment, please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 The lifting drive assembly 11 includes a lifting screw 9 vertically disposed in the middle of the rear side of the base 1. A fixed frame 10 is threadedly connected to the upper part of the lifting screw 9, and the front end of the fixed frame 10 is fixedly connected to the left and right ends of the rear side of the fixed plate 12. When the lifting screw 9 rotates, the fixed frame 10 drives the fixed plate 12 to move up and down. To improve the moving accuracy, a drive device 7 is disposed on the rear side of the upper surface of the base 1. The drive device 7 uses a servo motor and synchronous belt drive to drive the lifting screw 9 to rotate. Vertically disposed guide columns 8 are slidably connected to the left and right sides of the fixed frame 10. The lower end of the guide columns 8 is fixedly connected to the upper surface of the base 1. Through the guiding action of the guide columns 8, the up and down movement of the fixed frame 10 is made more stable.

[0037] In one instance of this embodiment, please refer to Figure 4 and Figure 5 The rotary drive assembly 13 includes a drive shaft 24 rotatably connected to the middle of the upper end of the fixed plate 12, with the drive shaft 24 oriented front-to-back. Due to the high rotational precision required for the drive shaft 24, a drive motor 26 is installed at the rear of the fixed plate 12. The drive motor 26 is also a servo motor, and its output shaft is directly and fixedly connected to the rear end of the drive shaft 24. A drive gear 25 is fixedly connected to the front end of the drive shaft 24. The drive gear 25 meshes with the gear 5 to be processed, enabling the drive gear 25 to drive the gear 5 to rotate precisely, thereby achieving precise heat treatment of each tooth of the gear 5.

[0038] In one instance of this embodiment, please refer to Figure 4 and Figure 5 The clamping assembly 14 includes sliding grooves 15 disposed on the left and right sides of the fixed plate 12. A slider 17 is slidably connected to the middle of the sliding groove 15, and a support roller 16 is rotatably connected to the front side of the slider 17. The support roller 16 extends into the interior of the gear 5, and the gear 5 is supported by the support rollers 16 on both sides (in the attached figure, for ease of showing the cooperation between the support roller 16 and the gear, the gear 5 is similar to a ring gear, but in actual use, as long as the gear 5 has mounting holes inside, it can be fixed by the support roller 16). When the sliding grooves 15 on both sides separate, the distance between the two support rollers 16 increases, thereby causing the gear 5 to move upward. After the upper part of the gear 5 abuts against the drive tooth 25, the gear 5 is fixed. This structure can achieve rapid positioning and clamping of the gear 5 by only the relative movement of the two support rollers 16. To make the gear 5 move faster, the sliding grooves 15 are designed to be inclined, that is, the upper sides of the two sliding grooves 15 extend outward. When the two sliders 17 separate from each other along the slide groove 15, the sliders 17 themselves also move upward adaptively, thereby making the gear 5 rise faster and improving the clamping efficiency.

[0039] A bearing seat 19 is provided on the rear side of the fixed plate 12, and a vertically arranged clamping screw 20 is rotatably connected to the bearing seat 19. A push block 21 oriented left and right is threadedly connected to the middle of the clamping screw 20. The lower ends of a support plate 22 are rotatably connected to the left and right ends of the push block 21, and a rotating seat 23 is rotatably connected to the upper end of the support plate 22. The rotating seat 23 is located at the rear end of the slider 17. Therefore, when the clamping screw 20 rotates, the push block 21 moves up and down, and the push block 21 drives the slider 17 to move along the slide groove 15 via the support plate 22. Since the movement accuracy requirement of the gear 5 is not high, a clamping motor 18 is provided on the lower part of the rear side of the fixed plate 12. The clamping motor 18 can be a common AC motor or a stepper motor. By controlling the output power, when the support roller 16 drives the gear 5 to move upward and the upper part of the gear 5 abuts against the lower part of the drive tooth 25, the output shaft power of the clamping motor 18 reaches its maximum value, indicating that the gear 5 has been fixed, and the clamping motor 18 can be stopped. A locking device can also be installed on the output shaft to prevent the gear 5 from falling off when the clamping motor 18 is powered off or stops working.

[0040] This embodiment includes the following steps during implementation: 1. Clamping preparation stage Start the lifting screw 9 to move the fixed plate 12 to the high position. Start the clamping motor 18, and through the cooperation of the clamping screw 20 and the push block 21, move the slider 17 downward, causing the two support rollers 16 to move closer together and downward. Use the hoisting equipment to vertically hoist the gear 5 to be processed to the front of the fixed plate 12, so that the center hole of the gear 5 fits outside the two support rollers 16, and the inner wall of the gear 5 rests on the support rollers 16. After the gear 5 is disengaged from the hoisting equipment, start the clamping motor 18 in reverse, and the two support rollers 16 move away from each other and upward until the upper part of the gear 5 abuts against the drive tooth 25. At this time, the teeth of the gear 5 are engaged with the drive tooth 25 (in actual use, the corresponding drive tooth 25 can be replaced according to the different number of teeth and module of the gear 5). Start the drive motor 26 to drive the gear 5 to rotate, rotate the first tooth to be quenched to the bottom, stop the rotation and lock it.

[0041] 2. Heating preparation stage The induction heater 27 is activated, employing a dual-frequency composite heating method: a 20kW mains frequency power heats the tooth root, while a 60kW intermediate frequency power heats the tooth surface and tooth tip. The heating temperature is controlled between 830 and 850℃ to ensure complete austenitization of the tooth surface. The cooling nozzle 28 is then opened. At this point, the gear 5 has not yet descended, and the cooling nozzle 28 is above the coolant level in the quenching liquid tank 3. The cooling nozzle 28 continuously sprays the coolant from the quenching liquid tank 3 upwards, and the sprayed coolant eventually falls back into the quenching liquid tank 3.

[0042] 3. Immersion and Cooling Stage The drive unit 7 is activated, driving the lifting screw 9 to rotate, which in turn lowers the fixed plate 12 and gear 5. When gear 5 descends close to the quenching liquid tank 3, the coolant sprayed from the cooling nozzle 28 impacts the lower part of gear 5, pre-cleaning the surface and removing oil stains. As gear 5 continues to descend, the tooth tip passes through the induction heater 27 (which has a U-shaped structure) from top to bottom, heating the tooth tip, tooth surface, and tooth root in sequence. After gear 5 continues to descend and is submerged in the coolant of the quenching liquid tank 3, the coolant level rises, successively submerging the tooth tip, tooth surface, and tooth root, completing the immersion cooling. At this time, the cooling nozzle 28 is completely submerged in the coolant, and the water flow from the nozzle 28 accelerates the internal flow rate of the coolant, quickly carrying away the air bubbles generated by the induction heater 27, thus improving the immersion cooling effect. The induction heater 27 stops heating after holding the temperature for 12 seconds, and gear 5 fully enters the immersion cooling stage.

[0043] 4. Spray cooling stage After gear 5 completes its immersion cooling, the lifting screw 9 moves gear 5 upwards. As gear 5 rises, the liquid level in the quenching tank 3 drops rapidly. When the cooling nozzle 28 emerges above the liquid surface, the water jet from the nozzle 28 directly impacts the root of gear 5. As gear 5 continues to rise, the cooling nozzle 28 sequentially sprays cooling treatment onto the root, surface, and tip of the gear. During the spraying process, the water jet also washes away surface impurities generated during heat treatment, achieving a secondary cleaning effect.

[0044] 5. Second heat treatment stage After gear 5 rises to its highest position, the rotary drive assembly 13 drives gear 5 to rotate again, moving the next tooth requiring heat treatment directly below. A gap of several teeth should be maintained between two consecutive teeth undergoing heat treatment to avoid deformation caused by repeated localized heat treatments. Gear 5 then descends again, repeating the heating, immersion cooling, and spray cooling processes until all teeth are quenched.

[0045] 6. Post-processing stage After all teeth have been quenched, the clamping assembly 14 is released, and the gear 5 is hoisted into the tempering furnace for low-temperature tempering treatment at 180–200℃ for 6 hours to eliminate quenching stress and stabilize dimensions.

[0046] This invention provides a large-size gear heat treatment device. Utilizing the lifting and lowering motion of the gear 5 itself, it achieves seamless switching between immersion cooling and spray cooling. Immersion first ensures uniform cooling of the entire gear teeth, reducing thermal stress. Then, spraying forcibly breaks the vapor film at the tooth root, ensuring the root cooling rate meets the martensitic transformation requirements and completely solving the problem of insufficient root hardening. This structure eliminates the complex lifting and lowering sealing groove and contoured sealing strip found in traditional devices, eliminating moving seals, preventing quenching liquid leakage, and reducing maintenance costs. The liquid level adjustment component 29 automatically changes the quenching liquid level in the quenching liquid tank 3 via the movement of the gear 5, requiring no additional pumps or valves, resulting in rapid response and low energy consumption. The inclined slide 15 type clamping component 14 provides multi-point uniform support for the gear 5, effectively preventing elliptical deformation of the large gear 5 and thin-walled gear ring due to their own weight. The dual-frequency composite induction heater 27 features a contoured design, with the heating layer evenly distributed along the tooth profile. The overall structure is compact and highly reliable, suitable for heat treatment of large-size gears 5 with different diameters and modules.

[0047] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A large size gear heat treatment apparatus comprising a base, the end of which is provided with a support, characterized in that, The support is provided with a quenching liquid tank for containing coolant, and also includes a lifting and adjusting mechanism and a heat treatment mechanism. The heat treatment mechanism includes cooling nozzles disposed on both sides of the bottom of the quenching liquid tank, the cooling nozzles being used to spray coolant onto the gear surface; The lifting and adjusting mechanism includes a fixed plate that is height-adjustably disposed above the quenching liquid tank, and a clamping assembly for clamping the gear and a rotary drive assembly for driving the gear to rotate are provided on the side of the fixed plate. When the gear descends to the lower limit with the fixed plate, one side of the gear is immersed in the coolant in the quenching liquid tank, and at this time the coolant level is higher than the nozzle height of the cooling nozzle. When the gear rises with the fixed plate and leaves the coolant, the coolant level is lower than the nozzle height of the cooling nozzle.

2. The large-size gear heat treatment equipment according to claim 1, characterized in that, The side wall of the quenching liquid tank is provided with an induction heater for heating a local tooth profile of the gear. The side of the support is provided with a liquid level regulating component for adjusting the volume of the coolant in the quenching liquid tank. When the gear moves toward the support, the liquid level regulating component increases the volume of the coolant in the quenching liquid tank. When the gear moves away from the support, the liquid level regulating component decreases the volume of the coolant in the quenching liquid tank.

3. The large-size gear heat treatment equipment according to claim 2, characterized in that, The liquid level regulating component includes a liquid storage chamber fixed to the side of the support. The liquid storage chamber is connected to the bottom of the quenching liquid tank through a connecting pipe. A piston is slidably and sealed inside the liquid storage chamber. A return spring is provided between the piston and the liquid storage chamber to force it to return to its original position away from the connecting pipe. A push rod is provided at the end of the piston away from the connecting pipe to engage with the gear.

4. The large-size gear heat treatment equipment according to claim 1, characterized in that, The fixed plate is vertically arranged, and a lifting drive assembly for driving the fixed plate to rise and fall is provided on the side facing away from the gear.

5. The large-size gear heat treatment equipment according to claim 4, characterized in that, The lifting drive assembly includes a lifting screw rotatably connected to the base, a fixing frame threaded onto the lifting screw and fixedly connected to the fixing plate, guide columns fixedly connected to the base on both sides of the fixing frame, and a drive device for driving the lifting screw to rotate on the base.

6. The large-size gear heat treatment equipment according to claim 1, characterized in that, The rotary drive assembly includes a drive shaft rotatably connected to the side of the fixed plate, and a drive tooth for meshing with the gear is provided on the side of the drive shaft adjacent to the gear. A drive motor for driving the drive shaft to rotate is provided on the fixed plate.

7. The large-size gear heat treatment equipment according to claim 1, characterized in that, The clamping assembly includes grooves on both sides of the fixed plate, with a slider slidably connected in the grooves, and a support roller for supporting the gear is rotatably provided on the side of the slider adjacent to the gear.

8. The large-size gear heat treatment equipment according to claim 1, characterized in that, The two slides are inclined towards the center of the fixed plate on the side near the base. A bearing seat is provided on the side of the fixed plate facing away from the gear. A clamping screw is rotatably connected in the bearing seat. A push block is threaded on the clamping screw. One end of the push block is hinged to one end of the support plate. The other end of the support plate is hinged to the side of the slider through a rotating seat. A clamping motor that drives the clamping screw to rotate is provided on the fixed plate.

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