High-precision hot mounting equipment for an aero-engine rotor

Abstract

The application belongs to the field of rotor assembly, and particularly relates to an aero-engine rotor high-precision hot mounting device, which comprises a base, a heating assembly arranged on one side of the base and comprising a high-frequency induction heater and a first power source for driving the high-frequency induction heater to move vertically, and a coil fixed to an output end of the high-frequency induction heater; a pressing assembly arranged on the base and comprising a pressing head and a second power source for driving the pressing head to move vertically; and an indexing assembly arranged on the base and comprising a turntable arranged on the base, a plurality of support seats arranged on the top of the turntable and a centering mechanism, wherein the outer wall of the support seat is uniformly and circumferentially provided with a plurality of ear plates; and the centering mechanism comprises a first positioning plate detachably arranged above the ear plates. Through the arrangement of the centering mechanism, the rotation shaft can be limited by the first positioning plate before being pressed into the rotor, so that the concentricity between the rotation shaft and the rotor is improved, and high-precision pressing of the rotor by the device is realized.

Description

Technical Field

[0001] This invention relates to the field of rotor assembly, specifically a high-precision thermal assembly device for aero-engine rotors. Background Technology

[0002] As a precision thermodynamic machine, the core rotor assembly of an aero engine is usually formed into a rigid whole by multiple disks, shafts and other parts through interference fit. Among them, pressing the shaft into the inner hole of the rotor is a key assembly link that determines the overall dynamic balance and reliability.

[0003] In existing hot fitting processes, high-frequency induction heating devices are commonly used to rapidly and uniformly heat the inner hole of the rotor to make it expand. Then, a stable and controllable pressing force is provided by hydraulic equipment to accurately press the shaft, which is at room temperature or has been cooled, into the inner hole of the rotor. After cooling, interference fit is used to achieve a firm connection.

[0004] The aforementioned existing technology has the following defects: the initial alignment of the shaft and the rotor usually relies on manual visual inspection to place the shaft to the end of the rotor. This method lacks reliable mechanical limit and automatic alignment compensation, which can easily lead to initial skew of the shaft hole centerline, resulting in additional friction and deformation during the press-fitting process, ultimately causing the assembly concentricity to exceed the tolerance, which directly affects the assembly accuracy and subsequent service life of the rotor assembly.

[0005] Therefore, a high-precision thermal mounting device for aero-engine rotors is proposed to address the above problems. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: A high-precision thermal mounting device for aero-engine rotors, comprising: a base; a heating assembly disposed on one side of the base, including a high-frequency induction heater and a first power source for driving the high-frequency induction heater to move vertically, wherein a coil is fixedly provided at the output end of the high-frequency induction heater; a pressing assembly disposed on the base, including a pressing head and a second power source for driving the pressing head to move vertically; an indexing assembly disposed on the base, including a turntable disposed on the base and a plurality of support seats disposed on the top of the turntable and an alignment mechanism, wherein a plurality of ear plates are uniformly fixedly disposed on the outer wall of the support seats along the circumferential direction; and the alignment mechanism including a first positioning plate detachably disposed above the ear plates.

[0008] Preferably, the centering mechanism further includes a second positioning plate located above the first positioning plate; the second positioning plate and the first positioning plate are connected by bolts.

[0009] Preferably, the centering mechanism further includes a bushing coaxially fixed between the first positioning plate and the second positioning plate; the bushing is made of a wear-resistant material.

[0010] Preferably, a vertical rod is detachably provided inside the ear plate; a top plate and a connecting mechanism are fixedly provided on the top of the vertical rod, wherein the connecting mechanism is used to rigidly connect the top plate and the first positioning plate.

[0011] Preferably, the connecting mechanism includes a column fixedly installed on the top of the top plate; a plurality of connecting rods located directly above the top plate are fixedly provided on the bottom of the first positioning plate; and the bottom of the connecting rods is provided with a groove that is interference-fitted with the column.

[0012] Preferably, it also includes a positioning component, which is disposed on the turntable and includes notches evenly arranged along the circumferential direction on the outer wall of the turntable; a locator with its end facing the notch is fixedly disposed on the base.

[0013] Preferably, the positioning component further includes a guide post and a third power source for driving the guide post to move vertically, wherein the guide post is used to mechanically position the turntable under the driving action of the third power source.

[0014] Preferably, both the notch and the outer wall of the guide post have an arc-shaped transition to reduce the resistance generated when they come into contact.

[0015] The advantages of this invention are: 1. The high-precision hot fitting equipment for aero-engine rotors of the present invention, by setting a centering mechanism, allows the shaft to be limited by a first positioning plate before being pressed into the rotor, thereby improving the concentricity between the shaft and the rotor, and thus achieving high-precision pressing of the rotor by the device.

[0016] 2. The high-precision hot mounting equipment for aero-engine rotors described in this invention can guide and limit the shaft before it is installed into the rotor shaft, thereby further improving the verticality and concentricity of the shaft with the rotor before press-fitting. In addition, the bolt connection between the first and second positioning plates can also adjust the gap between the second and first positioning plates to accommodate the installation of shafts of different lengths. Attached Figure Description

[0017] 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.

[0018] Figure 1 This is a schematic diagram of the main body of the present invention; Figure 2 This is a schematic diagram of the structure of the high-frequency induction heater in this invention; Figure 3 This is a schematic diagram of the base structure in this invention; Figure 4 This is a schematic diagram of the turntable structure in this invention; Figure 5 This is a schematic diagram of the support base in this invention; Figure 6 This is a schematic diagram of the ear plate in this invention.

[0019] In the diagram: 1. Base; 12. Press head; 13. High-frequency induction heater; 14. Coil; 15. Turntable; 16. Support base; 17. Ear plate; 18. First positioning plate; 2. Second positioning plate; 3. Bushing; 4. Upright; 42. Top plate; 5. Column; 52. Connecting rod; 6. Notch; 62. Positioner; 7. Guide column. Detailed Implementation

[0020] 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.

[0021] Specific implementation examples are given below.

[0022] Please see Figures 1 to 6 As shown in the embodiment of the present invention, a high-precision thermal mounting device for an aero-engine rotor includes: a base 1; a heating assembly disposed on one side of the base 1, including a high-frequency induction heater 13 and a first power source for driving the high-frequency induction heater 13 to move vertically, wherein a coil 14 is fixedly provided at the output end of the high-frequency induction heater 13; a pressing assembly disposed on the base 1, including a pressing head 12 and a second power source for driving the pressing head 12 to move vertically; and an indexing assembly disposed on the base 1, including a turntable 15 disposed on the base 1 and a plurality of support seats 16 disposed on the top of the turntable 15 and an alignment mechanism, wherein a plurality of ear plates 17 are uniformly fixedly disposed on the outer wall of the support seat 16 along the circumferential direction; and the alignment mechanism includes a first positioning plate 18 detachably disposed above the ear plates 17. During operation, the rotor to be heated can be manually placed on the multiple support seats 16 on the surface of the turntable 15. Taking this application as an example, the surface of the turntable 15 can specifically have four support seats 16. The turntable 15 can complete a 90° indexing rotation under the action of a servo motor or other indexing mechanism (such as a worm gear). One of the support seats 16 corresponds to the heating position, that is, it is located directly below the coil 14. The high-frequency induction heater 13 can be driven by the first power source (such as a hydraulic cylinder) to move the coil 14 downward to heat the rotor in the heating position. After heating for a specified time, the rotor can reach the specified temperature. Then, the first power source drives the high-frequency induction heater 13 and the coil 14 upward, and the turntable 15 rotates 90° to move the rotor originally in the heating position to the pressing position, that is, directly below the pressing head 12. After the movement is completed, the centering mechanism can be manually installed on the pressing head 12. Specifically, on the support base 16 of the combined work station, the bottom end of the first positioning plate 18 should have a safety gap with the rotor. The first positioning plate 18 and the support base 16 are coaxially provided with round holes, so that the rotating shaft can be inserted into the rotor shaft cavity through the round holes on the first positioning plate 18. After the pre-assembly is completed, the second power source (such as a hydraulic cylinder) can be manually started to drive the pressing head 12 to move down and press the rotating shaft into the rotor. After the pressing is completed, the second power source is reset, and the pressed rotor is then manually removed and a new rotor is placed. Finally, after the rotor of the heating station is heated and the high-frequency induction heater 13 is retracted, the turntable 15 can continue to rotate 90° and repeat the above pressing operation. By setting the centering mechanism, the rotating shaft can be limited by the first positioning plate 18 before being pressed into the rotor, so as to improve the concentricity between the rotating shaft and the rotor, thereby realizing the high-precision pressing of the rotor by the device.

[0023] Please see Figure 5 As shown, the centering mechanism also includes a second positioning plate 2 located above the first positioning plate 18; the second positioning plate 2 and the first positioning plate 18 are connected by bolts; The second positioning plate 2 can be integrated and installed on the first positioning plate 18 by bolts. The second positioning plate 2 and the first positioning plate 18 are identical in appearance. Both can guide and limit the shaft before it is installed into the rotor shaft, thereby further improving the verticality and concentricity of the shaft with the rotor before press-fitting. In addition, the bolt connection between the first positioning plate 18 and the second positioning plate 2 can also adjust the gap between the second positioning plate 2 and the first positioning plate 18 to accommodate the installation of shafts of different lengths.

[0024] Please see Figure 5 As shown, the centering mechanism also includes a bushing 3 coaxially fixed between the first positioning plate 18 and the second positioning plate 2; the bushing 3 is made of wear-resistant material. The bushing 3 is installed at the axis of the first positioning plate 18 and the second positioning plate 2. That is, when the rotating shaft passes through the axis of the first positioning plate 18 and the second positioning plate 2 and is installed into the rotor, the rotating shaft can directly contact the bushing 3 instead of contacting the first positioning plate 18 and the second positioning plate 2. Specifically, the bushing 3 can be made of stainless steel and covered with a ceramic coating, which can reduce the friction between the rotating shaft and the first positioning plate 18 and the second positioning plate 2 during manual installation and subsequent pressing, and reduce the wear on the outer wall of the rotating shaft.

[0025] Please see Figure 5 and Figure 6 As shown, a vertical rod 4 is detachably provided inside the ear plate 17; a top plate 42 and a connecting mechanism are fixedly provided on the top of the vertical rod 4, wherein the connecting mechanism is used to rigidly connect the top plate 42 and the first positioning plate 18. The upright 4 and the ear plate 17 are detachably connected, which allows for adjustment of the height of the upright 4 and the top plate 42. Specifically, the outer wall of the upright 4 can be provided with multiple round holes, and the ear plate 17 can be provided with round holes. The height of the upright 4 and the ear plate 17 can be adjusted by a pin, thereby adjusting the installation height of the first positioning plate 18 for different heights, i.e., different models of rotors, and thus adjusting the gap between the bottom of the first positioning plate 18 and the top of the rotor.

[0026] Please see Figure 6 As shown, the connecting mechanism includes a column 5 fixedly installed on the top of the top plate 42; a plurality of connecting rods 52 located directly above the top plate 42 are fixedly installed at the bottom of the first positioning plate 18; the bottom of the connecting rod 52 is provided with a groove that is interference fit with the column 5. The top plate 42 is provided with a column 5, and the bottom of the connecting rod 52 of the first positioning plate 18 is provided with a groove that is interference fit with the column 5. After the first positioning plate 18 is pressed onto the top of the top plate 42 through the connecting rod 52, the column 5 and the connecting rod 52 can be rigidly connected by a pin to improve the stability of the first positioning plate 18 and the second positioning plate 2 during installation and reduce the shaking that occurs when limiting the rotating shaft.

[0027] Please see Figure 3 and Figure 4 As shown, it also includes a positioning component, which is set on the turntable 15, including notches 6 evenly arranged along the circumferential direction on the outer wall of the turntable 15; a locator 62 with its end facing the notch 6 is fixed on the base 1. The positioner 62 can be a photoelectric sensor, specifically a reflector-type photoelectric sensor, which integrates a transmitter and a receiver. The inner wall of the notch 6 can be equipped with a reflector for the positioner 62. When the turntable 15 is rotated in increments, if the notch 6 is in the correct position, the rays emitted by the positioner 62 can be reflected back through the reflector inside the notch 6, so as to realize the device's assessment of the position accuracy after the turntable 15 is rotated.

[0028] Please see Figure 3 and Figure 4 As shown, the positioning assembly also includes a guide post 7 and a third power source for driving the guide post 7 to move vertically, wherein the guide post 7 is used to mechanically position the turntable 15 under the driving action of the third power source. When the turntable 15 rotates, if the ray emitted from the notch 6 is not received after being reflected by the positioner 62, it can be determined that the position of the turntable 15 has deviated after rotation. Then, a signal can be sent to the control module to drive the third power source (such as a hydraulic cylinder) to drive the guide column 7 to rise. When the guide column 7 rises, it can apply a lateral force to the notch 6, so that the notch 6 is in the correct position, thereby realizing the device's correction of the position of the turntable 15.

[0029] Please see Figure 4 As shown, both the notch 6 and the outer wall of the guide post 7 have an arc-shaped transition, which is used to reduce the resistance generated when the two come into contact.

[0030] Working principle: Multiple support seats 16 on the surface of the turntable 15 allow for manual placement of the rotor to be heated. Taking this application as an example, the surface of the turntable 15 can specifically have four support seats 16. The turntable 15 can complete a 90° indexing rotation under the action of a servo motor or other indexing mechanism (such as a worm gear). One of the support seats 16 corresponds to the heating position, located directly below the coil 14. A first power source (such as a hydraulic cylinder) can drive the high-frequency induction heater 13 to move the coil 14 downwards, heating the rotor at the heating position. After a specified heating time, the rotor reaches the specified temperature. Subsequently, the first power source drives the high-frequency induction heater 13 and the coil 14 upwards, and the turntable 15 rotates 90°, moving the rotor from the heating position to the pressing position. Located directly below the pressing head 12, after the movement is completed, the centering mechanism can be manually installed onto the support seat 16 of the pressing station. Specifically, a safety gap should be left between the bottom of the first positioning plate 18 and the rotor. The first positioning plate 18 and the support seat 16 are coaxially provided with round holes, through which the rotating shaft can be inserted into the rotor shaft cavity. After the pre-installation is completed, the second power source (such as a hydraulic cylinder) can be manually activated to drive the pressing head 12 to move down and press the rotating shaft into the rotor. After the pressing is completed, the second power source is reset, and the pressed rotor is then manually removed and a new rotor is placed. Finally, after the rotor in the heating station is heated and the high-frequency induction heater 13 is retracted, the turntable 15 can continue to rotate 90° and repeat the above pressing operation. The second positioning plate 2 can be integrated and installed on the first positioning plate 18 by bolts. The second positioning plate 2 and the first positioning plate 18 are identical in appearance. Both can guide and limit the shaft before it is installed into the rotor shaft, so as to further improve the verticality and concentricity of the shaft with the rotor before pressing. In addition, the bolt connection between the first positioning plate 18 and the second positioning plate 2 can also adjust the gap between the second positioning plate 2 and the first positioning plate 18 to accommodate the installation of shafts of different lengths. The bushing 3 is installed at the axis of the first positioning plate 18 and the second positioning plate 2. That is, when the rotating shaft passes through the axis of the first positioning plate 18 and the second positioning plate 2 and is installed into the rotor, the rotating shaft can directly contact the bushing 3 instead of contacting the first positioning plate 18 and the second positioning plate 2. Specifically, the bushing 3 can be made of stainless steel and covered with a ceramic coating, which can reduce the friction between the rotating shaft and the first positioning plate 18 and the second positioning plate 2 during manual installation and subsequent press-fitting, and reduce the wear on the outer wall of the rotating shaft. The upright 4 and the ear plate 17 are detachably connected, which allows for the adjustment of the height of the upright 4 and the top plate 42. Specifically, the outer wall of the upright 4 can be provided with multiple round holes, and the ear plate 17 can be provided with round holes. The height of the upright 4 and the ear plate 17 can be adjusted by a pin, so that the installation height of the first positioning plate 18 can be adjusted for different heights, i.e. different models of rotors, and the gap between the bottom of the first positioning plate 18 and the top of the rotor can be adjusted. The top plate 42 is provided with a column 5, and the bottom of the connecting rod 52 of the first positioning plate 18 is provided with a groove that is interference fit with the column 5. After the first positioning plate 18 is pressed onto the top of the top plate 42 through the connecting rod 52, the column 5 and the connecting rod 52 can be rigidly connected by a pin to improve the stability of the first positioning plate 18 and the second positioning plate 2 during installation and reduce the shaking that occurs when limiting the rotating shaft. The positioner 62 can be a photoelectric sensor, specifically a reflector-type photoelectric sensor, which integrates a transmitter and a receiver. The inner wall of the notch 6 can be equipped with a reflector of the positioner 62. When the turntable 15 is rotated in increments, if the notch 6 is in the correct position, the rays emitted by the positioner 62 can be reflected back through the reflector inside the notch 6, so as to realize the device's assessment of the position accuracy after the turntable 15 is rotated. When the turntable 15 rotates, if the ray emitted from the notch 6 is not received after being reflected by the positioner 62, it can be determined that the position of the turntable 15 has deviated after rotation. Then, a signal can be sent to the control module to drive the third power source (such as a hydraulic cylinder) to drive the guide column 7 to rise. When the guide column 7 rises, it can apply a lateral force to the notch 6, so that the notch 6 is in the correct position, thereby realizing the device's correction of the position of the turntable 15.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A high-precision thermal mounting device for an aero-engine rotor, characterized in that: include: Base (1), The heating assembly is located on one side of the base (1) and includes a high-frequency induction heater (13) and a first power source that drives the high-frequency induction heater (13) to move vertically. The output end of the high-frequency induction heater (13) is fixedly provided with a coil (14). The pressing assembly is mounted on the base (1) and includes a pressing head (12) and a second power source that drives the pressing head (12) to move vertically. The indexing assembly is set on the base (1) and includes a turntable (15) set on the base (1) and several support seats (16) set on the top of the turntable (15) and a centering mechanism. The outer wall of the support seat (16) is uniformly fixed with multiple ear plates (17) along the circumferential direction. The centering mechanism includes a first positioning plate (18) that is detachably disposed above the ear plate (17).

2. The high-precision thermal mounting equipment for aero-engine rotors according to claim 1, characterized in that: The centering mechanism also includes a second positioning plate (2) located above the first positioning plate (18); the second positioning plate (2) and the first positioning plate (18) are connected by bolts.

3. The high-precision thermal mounting equipment for aero-engine rotors according to claim 2, characterized in that: The centering mechanism also includes a bushing (3) coaxially fixed between the first positioning plate (18) and the second positioning plate (2); the bushing (3) is made of wear-resistant material.

4. The high-precision thermal mounting equipment for aero-engine rotors according to claim 1, characterized in that: The ear plate (17) is detachably provided with a vertical rod (4); the top of the vertical rod (4) is fixedly provided with a top plate (42) and a connecting mechanism, wherein the connecting mechanism is used to rigidly connect the top plate (42) and the first positioning plate (18).

5. The high-precision thermal mounting equipment for aero-engine rotors according to claim 4, characterized in that: The connecting mechanism includes a column (5) fixedly installed on the top of the top plate (42); a plurality of connecting rods (52) located directly above the top plate (42) are fixedly provided on the bottom of the first positioning plate (18); the bottom of the connecting rod (52) is provided with a groove that is interference fit with the column (5).

6. The high-precision thermal mounting equipment for aero-engine rotors according to claim 1, characterized in that: It also includes a positioning component, which is set on the turntable (15), including notches (6) evenly arranged along the circumferential direction on the outer wall of the turntable (15); a locator (62) with its end facing the notch (6) is fixed on the base (1).

7. The high-precision thermal mounting equipment for aero-engine rotors according to claim 6, characterized in that: The positioning assembly also includes a guide post (7) and a third power source that drives the guide post (7) to move vertically, wherein the guide post (7) is used to mechanically position the turntable (15) under the driving action of the third power source.

8. The high-precision thermal mounting equipment for aero-engine rotors according to claim 7, characterized in that: The outer walls of the notch (6) and the guide post (7) are both arc-shaped transitions to reduce the resistance generated when they come into contact.

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