Rotary driving mechanism for induction heating integral quenching of bearing ring

Abstract

The utility model discloses a rotary driving mechanism for induction heating integral quenching of a bearing ring, which is characterized in that a horizontal support frame is arranged on diagonal lines of four corners of a quenching tank in a cross manner, and a worm and gear transmission mechanism is arranged at the cross center position of the horizontal support frame; the worm and gear transmission mechanism inputs power by a torque motor through a worm gear speed reducer, a gear is arranged on a worm gear shaft, the gear is meshed with a rack, a rotary positioning roller is movably supported and positioned on the annular surface of a workpiece, and the workpiece can be driven to rotate when a driving supporting roller rotates; the structure is compact and reasonable in design, accurate and stable control over overall rotating operation of the induction quenching workpiece can be achieved, the rotating positioning rollers make contact with the annular face of the workpiece all the time in the heating and quenching process, the device adapts to workpiece size and stress changes caused by thermal expansion when the workpiece is heated and cold contraction when quenching cooling is conducted, swinging of the workpiece during high-speed rotating is avoided, and the workpiece quality is improved. Quenching heating and cooling are more uniform, and the product quality of induction heating whole quenching workpieces is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of bearing induction quenching heat treatment, and in particular relates to a rotary drive mechanism for induction heating and integral quenching of a bearing ring. Background Art

[0002] With the rapid development of the wind power industry, wind power generation has gradually shifted from onshore to offshore, with power increasing from 10 MW to 20 MW. Consequently, wind turbine main bearings are becoming larger and larger, facing harsher operating environments, higher maintenance costs, and stricter reliability requirements. Traditional carburized steel main bearings face increasing challenges in heat treatment, including increasing deformation control difficulties, long production cycles, high costs, and unreliable delivery schedules, hindering industry development. Consequently, soft-band-free induction hardening of main bearing rings is gaining acceptance as an alternative to traditional carburizing and quenching, and soft-band-free quenching of main bearings for large-megawatt wind turbines has become a new trend. However, traditional soft-band-free induction hardening involves scanning heating and quenching, which often makes it difficult to ensure uniformity in hardened layer depth and hardness, leading to high product rework rates and frequent cracking and scrapping. Consequently, a new type of rotary induction hardening equipment has been developed.

[0003] During the quenching heating process, the workpiece will experience thermal expansion. As the temperature continues to rise, the workpiece will continue to expand. During this process, the workpiece must maintain high-speed and stable rotation to meet the requirements of induction heating. During the quenching cooling process, the workpiece will shrink while continuing to rotate. During the heating and cooling process, how to ensure that the rotating support mechanism adapts to the dimensional changes of the workpiece while playing a supporting role is crucial. This is one of the important conditions to ensure uniform and stable heating of the workpiece, and it is also a key factor in avoiding deformation of the workpiece during the quenching cooling process. Summary of the Invention

[0004] In order to solve the above technical problems, the utility model provides a rotary drive mechanism for induction heating and integral quenching of bearing rings. The structure is compact and reasonable in design and easy to operate. It ensures that the workpiece rotates stably during the induction heating and quenching cooling process, ensures the uniformity of quenching heating and cooling, ensures the long-term and reliable operation of the quenching equipment, meets the process requirements of the quenching equipment, and improves the product quality of the induction heating integral quenching workpiece.

[0005] The technical solution adopted by the utility model is: a rotating drive mechanism for induction heating and overall quenching of a bearing ring, comprising a horizontal support frame of a box-type structure, the quenching tank of a square structure, the horizontal support frame being cross-arranged on the diagonals of the four corners of the quenching tank, a worm gear transmission mechanism being arranged at the cross-intersection center position of the horizontal support frame, the worm gear transmission mechanism being powered by a torque motor through a worm gear reducer, a gear being arranged on the worm shaft of the worm gear transmission mechanism, a driving positioning block being arranged near the end position at the four corners of the horizontal support frame, a rack being slidably arranged along the length direction of the horizontal support frame, the outer end portion of the rack being fixedly connected to the driving positioning block, the rack and the gear being meshed with each other, the rack driving the driving positioning block to move along the length direction of the horizontal support frame; a driving support roller and a rotating positioning roller being arranged on the driving positioning block, the workpiece being placed on the driving support roller, the rotating positioning roller being movably supported and positioned on the annular surface of the workpiece, and the workpiece being driven to rotate when the driving support roller rotates.

[0006] The four corners of the horizontal support frame are fixedly installed with connecting columns, which are connected to the lifting device outside the quenching tank. The horizontal support frame can be lifted and moved in the quenching tank.

[0007] The drive support rollers are composed of an outer drum and a central rotating shaft. They utilize a spiral labyrinth seal structure and are driven by a hydraulic motor. They rotate the workpiece, ensuring stable rotation during induction heating and quenching cooling, ensuring quenching uniformity, and improving the quality of induction-heated, fully quenched workpieces.

[0008] A slide rail is fixedly provided on one side of the driving positioning block along the length direction of the horizontal support frame, a slider is slidably provided on the slide rail, the rotary positioning roller is installed on the slider, the axial direction of the rotary positioning roller is perpendicular to the length direction of the horizontal support frame, and one end of the slider is connected to the cylinder or hydraulic cylinder to realize the movement of the slider and the rotary positioning roller to meet the requirements of different support positions of the inner and outer rings of the bearing.

[0009] The torque motor and worm gear reducer are both installed on the top of the connecting column. The output end of the reducer worm gear shaft extends downward along the inside of the connecting column into the bottom transmission box. A worm gear is provided at the bottom of the reducer worm gear shaft. The worm power input end of the worm gear transmission mechanism extends along the horizontal support frame box toward the connecting column. The worm of the worm gear transmission mechanism is meshed with the worm gear on the reducer worm gear shaft in the transmission box.

[0010] The gears of the worm gear transmission mechanism are located on the inner sides of the two sets of racks, and the opposite sides of the two sets of racks are respectively engaged with the gears. Rack one and rack three are arranged in parallel and staggered on the same plane on the horizontal frame of the horizontal support frame, and rack two and rack four are arranged in parallel and staggered on the same plane on the vertical frame of the horizontal support frame. The four racks are engaged with the gears at the same time to form a well-shaped meshing structure.

[0011] The torque motor and worm gear reducer are both mounted on top of the connecting column. The output end of the reducer's worm gear shaft extends downward along the interior of the connecting column into the transmission housing at the bottom. A worm wheel is disposed at the bottom of the reducer's worm gear shaft. The worm power input end of the worm gear transmission mechanism extends from the horizontal support frame housing toward the connecting column. The worm of the worm gear transmission mechanism meshes with the worm wheel on the reducer's worm gear shaft within the transmission housing. This arrangement is intended to achieve a compact worm gear mechanism using a worm gear reducer and worm gear transmission mechanism. The worm gear transmission is equivalent to a helical transmission, employing a multi-tooth meshing transmission with line contact between the meshing tooth surfaces of the two wheels. The worm has a large axial load capacity, stable transmission, and low noise. This makes it suitable for applications where the present invention employs two staggered axes, a high transmission ratio, low transmission power, and intermittent operation. The output power of the torque motor is transmitted through the two 90° staggered axes of the worm gear reducer and worm gear transmission mechanism, driving the rack and pinion mechanism more smoothly and reliably.

[0012] The gear train is connected with the gear axle by the gear reducer, and the gear train is connected with the gear train by the gear reducer, and the gear train is connected with the gear axle by the gear reducer, and the gear train is connected with the gear train respectively.

[0013] The drive support rollers are composed of an outer drum and a central rotating shaft. They utilize a spiral labyrinth-type combined seal structure and are driven by a hydraulic motor. The worm of the worm gear mechanism is connected to the output shaft of the hydraulic motor via a coupling. This configuration ensures that the drive support rollers utilize a hydraulic motor as their power source. Considering their exposure to the quenching fluid, the fully enclosed hydraulic motor is suitable for the harsh operating environment within the quenching tank. Hydraulic motors convert the pressure energy of a liquid medium into rotational motion. Hydraulic systems offer high energy density, are relatively lightweight, require no specialized design, and are low-cost. The hydraulic motors are easily adjustable, with hydraulic valves providing stepless speed adjustment between 0 and maximum speed. The hydraulic system offers strong overload resistance, and thanks to the protection of a relief valve, it tolerates frequent and prolonged overloads. Overload recovery is easy, without damage to the equipment or the need for restart, ensuring reliable operation. This ensures long-term, reliable operation of the quenching equipment and meets the process requirements.

[0014] The beneficial effects of the utility model are as follows: the rotary drive mechanism has a compact and reasonable structural design, is easy to operate, and has precise positioning and smooth operation. It can realize precise and stable control of the overall rotation of the induction quenching workpiece. During the heating and quenching process, the rotary positioning roller is always in contact with the annular surface of the workpiece, avoiding changes in the workpiece size and force caused by thermal expansion when the workpiece is heated and contraction when quenching and cooling, which cause swings during high-speed rotation; ensuring the stability of the workpiece rotation, making the quenching process more stable and uniform, ensuring long-term and reliable operation of the quenching equipment, meeting the process requirements of the quenching equipment, improving the product quality of the induction heated overall quenching workpiece, and improving the utilization rate and production efficiency of the induction heated overall quenching equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall top view of the quenching rotary drive mechanism of the utility model;

[0016] Figure 2 This is a schematic side view of the overall structure of the quenching rotary drive mechanism of the utility model;

[0017] Figure 3 This is a structural diagram of the worm gear transmission mechanism of the utility model;

[0018] Figure 4 This is a schematic diagram of the structure of the rack and pinion tic-tac-toe drive system of the present invention.

[0019] Markings in the figure: 1. Quenching tank; 2. Horizontal support frame; 3. Induction heater; 4. Drive positioning block; 5. Worm gear transmission mechanism; 6. Gear; 7. Rack 1; 8. Rack 2; 9. Rack 3; 10. Rack 4; 11. Drive support roller; 12. Hydraulic motor; 13 Rotary positioning roller; 14. Slider; 15. Slide rail; 16. Hydraulic cylinder; 17. Connecting column; 18. Lifting device; 19. Worm; 20. Workpiece; 21. Torque motor; 22. Worm gear reducer; 23. Reducer worm shaft. DETAILED DESCRIPTION

[0020] The specific implementation of the present invention is further described in detail below with reference to the accompanying drawings.

[0021] like Figure 1-4As shown, a rotary drive mechanism for induction heating and integral quenching of a bearing ring comprises a horizontal support frame 2 of a box-type structure, a quenching tank 1 of a square structure, the horizontal support frame 2 being cross-shaped and arranged on the diagonal lines of the four corners of the quenching tank 1, a worm gear transmission mechanism 5 being arranged at the center position of the cross intersection of the horizontal support frame 2, the worm gear transmission mechanism 5 being driven by a torque motor 21 through a worm gear reducer 22, a gear 6 being arranged on the worm shaft of the worm gear transmission mechanism 5, and the four corners of the horizontal support frame 2 being near the end positions. A driving positioning block 4 is provided, and a rack is slidably provided along the length direction of the horizontal support frame 2. The outer end of the rack is fixedly connected to the driving positioning block 4, and the rack and the gear 6 are engaged with each other. The rack drives the driving positioning block 4 to move along the length direction of the horizontal support frame 2; a driving support roller 11 and a rotating positioning roller 13 are provided on the driving positioning block 4, and the workpiece 20 is placed on the driving support roller 11. The rotating positioning roller 13 is movably supported and positioned on the annular surface of the workpiece 20. When the driving support roller 11 rotates, the workpiece 20 can be driven to rotate.

[0022] Connecting columns 17 are fixedly installed at the four corners of the horizontal support frame 2 . The connecting columns 17 are connected to a lifting device 18 outside the quenching tank 1 , so that the horizontal support frame 2 can be lifted and moved in the quenching tank 1 .

[0023] The drive support roller 11 is composed of an outer roller and a central rotating shaft. It utilizes a spiral labyrinth-type combined seal structure. The shaft is threadedly connected to the end cap, which features concave and convex grooves that, together with the spiral structure on the roller, form a spiral labyrinth-type combined seal. The spiral labyrinth-type combined seal formed by the end cap and roller effectively prevents the intrusion of dust, impurities, and wastewater into the drive support roller 11 under harsh operating conditions, meeting sealing requirements. Driven by a hydraulic motor 12, the drive support roller 11 rotates the workpiece 20, ensuring stable rotation during induction heating and quenching cooling, ensuring quenching uniformity, and improving the product quality of the induction-heated, fully quenched workpiece.

[0024] A slide rail 15 is fixedly provided on one side of the driving positioning block 4 along the length direction of the horizontal support frame 2, and a slider 14 is slidably provided on the slide rail 15. The rotary positioning roller 13 is installed on the slider 14. The axial direction of the rotary positioning roller 13 is perpendicular to the length direction of the horizontal support frame 2. One end of the slider 14 is connected to the cylinder or hydraulic cylinder 16, which can realize the movement of the slider 14 and the rotary positioning roller 13 to meet the requirements of different support positions of the inner and outer rings of the workpiece 20.

[0025] The torque motor 21 and the worm gear reducer 22 are both installed on the top of the connecting column 17. The output end of the reducer worm gear shaft 23 extends downward along the inside of the connecting column 17 into the bottom transmission box. A worm gear is provided at the bottom of the reducer worm gear shaft 23. The power input end of the worm 19 of the worm gear transmission mechanism 5 extends along the box of the horizontal support frame 2 toward the connecting column 17. The worm 19 of the worm gear transmission mechanism 5 is meshed with the worm gear on the reducer worm gear shaft 23 in the transmission box.

[0026] The gear 6 of the worm gear transmission mechanism 5 is located on the inner side of the two sets of racks, and the opposite sides of the two sets of racks are respectively engaged with the gear 6. Rack 1 7 and rack 3 9 are arranged in parallel and staggered on the same plane on the horizontal frame of the horizontal support frame 2. Rack 2 8 and rack 4 10 are arranged in parallel and staggered on the same plane on the vertical frame of the horizontal support frame 2. The four racks are engaged with the gear 6 at the same time to form a well-shaped meshing structure.

[0027] During operation, according to the diameter of the workpiece 20, the torque motor 21 is started, and the reducer worm gear shaft 23 located inside the connecting column of the lifting mechanism rotates. The worm gear on the reducer worm gear shaft 23 engages with the worm 19 of the worm gear transmission mechanism 5 to output power, driving the gear 6 of the worm gear transmission mechanism 5 to rotate. The gear 6 drives two sets of racks in a criss-cross meshing structure. The rack drives the driving positioning block 4 to move along the length direction of the horizontal support frame 2, adjust the position of the driving positioning block 4 near the end at the four corners of the horizontal support frame 2, and place the slewing support workpiece 20 on the driving support roller 11 of the driving positioning block 4. Then start the cylinder or hydraulic cylinder 16 to adjust the position of the slider 14 on the driving positioning block 4. The slider 14 drives the rotating positioning roller 13 to move to the annular position of the workpiece 20. The four rotating positioning rollers 13 tension the workpiece 20 to prevent the workpiece 20 from swinging during rotation.

[0028] Under the automatic control of the program, the robotic arm drives the multi-head induction heater 3 to move to the predetermined position, confirms the start of the program, the hydraulic system is started, the hydraulic motor 12 drives the driving support roller 11 to rotate, and drives the workpiece 20 on the supporting roller 11 to rotate rapidly and start induction heating. Under the action of centripetal force, the workpiece 20 will automatically align; during the heating process, as the workpiece 20 expands with the heat, the rotating positioning roller 13 is always kept in contact with the annular surface of the workpiece 20 to ensure the stability of the rotation center of the workpiece 20. After heating to the set temperature required by the process, the induction heater 3 quickly withdraws from the safe distance, and the operating lifting device 18 is quickly lowered. The lifting device 18 drives the horizontal support frame 2 and the workpiece 20 into the quenching tank 1 through the connecting column 17. The workpiece 20 enters the quenching medium for rotational quenching. After the quenching time reaches the time set by the process, the quenching cooling is completed, the operating lifting device 18 rises, the workpiece 20 stops rotating, and unloading can be carried out at this time. The precise and stable control of the rotation of the induction heated integral quenching workpiece 20 can be achieved. The rotating positioning roller 13 is always in contact with the annular surface of the workpiece during the heating and quenching process, avoiding the changes in the workpiece size and force caused by the thermal expansion of the workpiece 20 when heated and the contraction during quenching and cooling, which cause swinging during high-speed rotation; ensuring the stability of the rotation of the workpiece 20, more uniform quenching, ensuring the long-term and reliable operation of the quenching equipment, meeting the process requirements of the quenching equipment, improving the product quality of the induction heated integral quenching workpiece 20, and improving the utilization rate and production efficiency of the induction heated integral quenching equipment.

[0029] In addition to the above embodiments, the present invention may also have other implementation methods. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A rotary drive mechanism for induction heating and overall quenching of bearing rings, characterized by: The horizontal support frame includes a box-type structure, the quenching tank is a cubic structure, the horizontal support frame is cross-shaped and arranged on the diagonals of the four corners of the quenching tank, a worm gear transmission mechanism is arranged at the cross center position of the horizontal support frame, the worm gear transmission mechanism is powered by a torque motor through a worm gear reducer, a gear is arranged on the worm shaft of the worm gear transmission mechanism, a driving positioning block is arranged near the end position at the four corners of the horizontal support frame, a rack is slidably arranged along the length direction of the horizontal support frame, the outer end of the rack is fixedly connected to the driving positioning block, the rack and the gear are meshed with each other, and the rack drives the driving positioning block to move along the length direction of the horizontal support frame; a driving support roller and a rotating positioning roller are provided on the driving positioning block, the workpiece is placed on the driving support roller, the rotating positioning roller is movably supported and positioned on the annular surface of the workpiece, and the workpiece is driven to rotate when the driving support roller rotates.

2. The rotary drive mechanism for induction heating and integral quenching of bearing rings according to claim 1, characterized in that: Connecting columns are fixedly installed at the four corners of the horizontal support frame, and the connecting columns are connected to the lifting device outside the quenching tank. The horizontal support frame can be lifted and moved in the quenching tank.

3. The rotary drive mechanism for induction heating and overall quenching of bearing rings according to claim 1, characterized in that: The driving support roller is composed of an outer roller and a central rotating shaft. The driving support roller adopts a spiral labyrinth combined sealing structure and is driven by a hydraulic motor.

4. The rotary drive mechanism for induction heating and overall quenching of bearing rings according to claim 1, characterized in that: A slide rail is fixedly provided on one side of the driving positioning block along the length direction of the horizontal support frame, a slider is slidably provided on the slide rail, the rotary positioning roller is installed on the slider, the axial direction of the rotary positioning roller is perpendicular to the length direction of the horizontal support frame, and one end of the slider is connected to the cylinder or hydraulic cylinder to realize the movement of the slider and the rotary positioning roller.

5. The rotary drive mechanism for induction heating and overall quenching of bearing rings according to claim 1, characterized in that: The torque motor and the worm gear reducer are both installed on the top of the connecting column. The output end of the reducer worm gear shaft extends downward along the inside of the connecting column to the bottom transmission box. A worm gear is provided at the bottom of the reducer worm gear shaft. The worm power input end of the worm gear transmission mechanism extends along the horizontal support frame box toward the connecting column. The worm of the worm gear transmission mechanism is meshed with the worm gear on the reducer worm gear shaft in the transmission box.

6. The rotary drive mechanism for induction heating and overall quenching of bearing rings according to claim 1, characterized in that: The gears of the worm gear transmission mechanism are located on the inner sides of the two sets of racks, and the opposite sides of the two sets of racks are respectively engaged with the gears. Rack one and rack three are arranged in parallel and staggered on the same plane on the horizontal frame of the horizontal support frame, and rack two and rack four are arranged in parallel and staggered on the same plane on the vertical frame of the horizontal support frame. The four racks are engaged with the gears at the same time to form a well-shaped meshing structure.

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