CN111376016B - Positioning and guiding tool for low-pressure turbine of engine - Google Patents
Positioning and guiding tool for low-pressure turbine of engine Download PDFInfo
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- CN111376016B CN111376016B CN202010245691.7A CN202010245691A CN111376016B CN 111376016 B CN111376016 B CN 111376016B CN 202010245691 A CN202010245691 A CN 202010245691A CN 111376016 B CN111376016 B CN 111376016B
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- pressure turbine
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
Abstract
The invention provides a positioning and guiding tool for a low-pressure turbine of an engine, which comprises a traction shaft and a positioning shaft, wherein the positioning shaft is arranged at the end part of the traction shaft and extends axially, and the positioning shaft is used for extending into an inner hole of a low-pressure turbine shaft so that the traction shaft and the low-pressure turbine shaft are coaxially arranged; the positioning shaft is provided with a locking structure, and when the positioning shaft extends into an inner hole of the low-pressure turbine shaft, the locking structure is used for axially positioning the traction shaft; when assembled, the trailing end of the trailing shaft passes through the core and fan rotor and is located outside of the fan rotor. The positioning and guiding tool is coaxially connected with the low-pressure turbine shaft, the length of the low-pressure turbine shaft is prolonged, the coaxial state of the low-pressure turbine shaft is adjusted through an external traction shaft, the coaxial state of the low-pressure turbine shaft is convenient to adjust, bearing balls are prevented from colliding with a bearing outer ring, meanwhile, the low-pressure turbine is driven to move through the traction shaft, the low-pressure turbine is dragged to move in the process of adjusting the coaxiality, the low-pressure turbine and the bearing outer ring are enabled to be synchronously carried out, operation is convenient.
Description
Technical Field
The invention relates to the technical field of engine assembly, in particular to a positioning and guiding tool for a low-pressure turbine of an engine.
Background
The low-pressure turbine of the engine is in a unit structure, and a bearing inner ring, a retainer and a bearing cylindrical roller of a four-fulcrum bearing of the engine are assembled on a low-pressure turbine shaft and belong to one part of a low-pressure turbine unit; the bearing outer ring is assembled on a rear shaft neck of the high-pressure turbine rotor and belongs to a part of a core machine unit body. During assembly, the low-pressure turbine and the core machine are horizontally assembled, the low-pressure turbine is horizontally assembled on the core machine unit body, the bearing cylindrical roller horizontally enters the bearing outer ring, the gap between the outer diameter of the bearing cylindrical roller and the bearing inner ring is only 0.07mm, in the assembly process, the low-pressure turbine is pushed to move towards one side of the core machine, the low-pressure turbine shaft firstly penetrates through the core machine to be meshed with the fan rotor, at the moment, the low-pressure turbine shaft completely enters the core machine and the fan rotor and is located in an inner space, the coaxial state of the low-pressure turbine shaft cannot be monitored and adjusted, if the concentricity of the low-pressure turbine shaft and the core machine is poor, the bearing cylindrical roller easily touches the bearing outer ring during assembly, the bearing outer ring is damaged, the roller is abraded, and even; after the 4-pivot bearing is damaged, the engine can be off the bench due to faults such as metal scrap alarming, low-pressure rotor rotation clamping stagnation and the like in the test run process.
Disclosure of Invention
Aiming at the problem that a bearing is easily damaged in the installation process of a low-pressure turbine and a core machine of the existing engine, the invention provides a positioning guide tool of the low-pressure turbine of the engine, which realizes the rapid assembly of the low-pressure turbine and the core machine and solves the problem of bearing loss in the assembly process.
The invention is realized by the following technical scheme:
a positioning and guiding tool for a low-pressure turbine of an engine comprises a traction shaft and a positioning shaft axially extending from the end of the traction shaft, wherein the positioning shaft is used for extending into an inner hole of a low-pressure turbine shaft so that the traction shaft and the low-pressure turbine shaft are coaxially arranged;
the positioning shaft is provided with a locking structure, and when the positioning shaft extends into an inner hole of the low-pressure turbine shaft, the locking structure is used for axially positioning the traction shaft;
when assembled, the trailing end of the trailing shaft passes through the core and fan rotor and is located outside of the fan rotor.
Preferably, the locking structure comprises an adjusting shaft and a plurality of adjusting keys;
a plurality of key grooves arranged along the axial direction are circumferentially arranged on the shaft wall of the positioning shaft at intervals, and the adjusting keys are rotationally arranged in the key grooves;
the adjusting shaft is arranged in a shaft hole of the positioning shaft and can move axially, an inward concave space is formed in the side wall of the adjusting shaft, the side wall, close to the shaft center, of the adjusting key extends into the inward concave space, the adjusting shaft moves axially, the end portion of the adjusting key is extruded, the stressed end of the adjusting key is rotated to the outside of the positioning shaft, and the adjusting key is abutted to the inner wall of the low-pressure turbine shaft.
Preferably, two ends of the concave space are provided with symmetrical guide surfaces, and the guide surfaces press the end part of the adjusting key to rotate.
Preferably, both ends of the adjusting key are inclined planes matched with the guide surfaces.
Preferably, the concave space is an annular groove axially arranged on the adjusting shaft.
Preferably, the end part of the adjusting shaft is connected with one end of the adjusting rod through threads, the other end of the adjusting rod extends out of the traction shaft, the adjusting rod is connected with the traction shaft through an axial limiting mechanism, and the adjusting rod rotates to enable the adjusting shaft to move axially through the threads.
Preferably, the axial limiting mechanism is a positioning ring arranged at the end part of the adjusting rod and a shaft cover fixedly connected to the end part of the traction shaft, the positioning ring abuts against the inner wall of the shaft cover, and the end part of the adjusting rod extends out of the shaft cover and is fixedly connected with the handle.
Preferably, the outer wall of the traction shaft is provided with a plurality of positioning blocks used for being matched with positioning grooves at the end part of the low-pressure turbine shaft, so that the circumferential positioning of the traction shaft and the low-pressure turbine shaft is realized.
Preferably, a plurality of clamping grooves are formed in the circumferential direction of the end portion of the outer wall of the traction shaft, one end of the positioning block is assembled in the clamping grooves, and the other end of the positioning block extends towards one end far away from the center of the shaft along the radial center line of the traction shaft.
Preferably, one end of the traction shaft, which is positioned outside the fan rotor, is connected with a torque multiplier for applying torque to the traction shaft so as to enable the traction shaft and the low-pressure turbine to rotate synchronously.
Compared with the prior art, the invention has the following beneficial technical effects:
the positioning and guiding tool of the low-pressure turbine of the engine is coaxially connected with the low-pressure turbine shaft, the length of the low-pressure turbine shaft is prolonged, in the assembling process, the traction shaft sequentially penetrates through the core machine, the traction shaft sleeve and the connecting shaft sleeve and extends to the outside of the fan rotor, in the assembling process of the low-pressure turbine, the coaxial state of the low-pressure turbine shaft is adjusted through the external traction shaft, the coaxial state of the low-pressure turbine shaft is convenient to adjust, bearing balls are prevented from colliding with the outer ring of a bearing, meanwhile, the low-pressure turbine is driven to move through the traction shaft, and in the process of adjusting the coaxiality, the low-pressure turbine is pulled to move, so that the low-pressure turbine and the low-pressure.
Furthermore, the traction shaft is connected with the low-pressure turbine shaft through the positioning shaft and the positioning block, and the traction shaft and the low-pressure turbine shaft are coaxially positioned and axially positioned, so that the positioning accuracy of the traction shaft and the low-pressure turbine shaft is improved.
Furthermore, the adjusting shaft is adopted to control the rotation of the adjusting key, the end part of the adjusting key is abutted against the inner wall of the low-pressure turbine shaft, the plurality of adjusting keys form an annular supporting force, the adjusting shaft is connected with the low-pressure turbine shaft, the expansion mechanism can be connected mutually under the structure without changing the low-pressure turbine shaft, the installation and the disassembly are very convenient, and the installation efficiency is greatly improved.
Furthermore, the regulating shaft passes through threaded connection with the regulation pole, under the state of adjusting pole axial positioning, rotate the rotation that the regulation pole can realize the regulating shaft through the screw thread, simple structure and solute make, the rotatory axial displacement volume that produces of screw thread is less simultaneously, and then can the multiaxis displacement volume carry out accurate control, and then control the holding power of adjusting key to the low pressure turbine shaft, avoid the holding power too big to cause the damage to the inner wall of low pressure turbine shaft, simultaneously at the in-process of dismantling, only need cancel the holding power of adjusting key and low pressure turbine shaft, can realize separation between them.
Furthermore, the concave space of the adjusting shaft is an annular groove, all adjusting keys can be controlled simultaneously, and the processing is convenient.
Furthermore, torsion is applied to the traction shaft externally, the traction shaft and the low-pressure turbine rotate synchronously, and then the low-pressure turbine shaft has dual acting force of rotation and axial movement, bearing cylindrical rollers on the low-pressure turbine shaft are gradually assembled into a bearing outer ring in the rotation process, the bearing cylindrical rollers rotate synchronously along with the low-pressure turbine shaft, the cylindrical rollers rotate along with the low-pressure turbine shaft in the slow screwing-in process of the low-pressure turbine, when the cylindrical rollers contact the bearing outer ring, the rollers are sequentially lifted in a spiral shape by the outer ring under a contact surface along with the rotation of the cylindrical rollers, the bearing cylindrical rollers are tightened inwards in the radial direction, the problem that circumferential gaps generated by the gravity of the rollers are uneven is eliminated, the rollers can be ensured to smoothly enter the bearing outer ring, and the problem that the cylindrical rollers and the bearing outer ring are.
Drawings
FIG. 1 is a schematic view of the low pressure turbine, core and fan rotor assembly of the present invention;
FIG. 2 is a schematic view of the installation of the low pressure turbine and the positioning and guiding tool of the present invention;
FIG. 3 is a schematic view of the installation of the traction tool and the fan rotor of the present invention;
FIG. 4 is an enlarged view of a portion of FIG. 3;
FIG. 5 is a schematic structural view of a positioning and guiding tool according to the present invention;
FIG. 6 is a cross-sectional view of the positioning and guiding tool of the present invention;
FIG. 7 is an enlarged view of a portion of FIG. 5;
FIG. 8 is a schematic view of the structure of the adjusting lever of the present invention;
FIG. 9 is a schematic structural view of a low-pressure turbine shaft positioning tool of the present invention;
FIG. 10 is a schematic drawing assembly of the low pressure turbine and core of the present invention;
fig. 11 is a schematic structural view of the locking mechanism of the present invention.
In the figure: 1. a low pressure turbine; 2. a horizontal spreader with adjustable center of gravity; 3. a core machine; 4. a fan rotor; 5. positioning and guiding a tool; 6. drawing a tool; 7. a guide device; 8. a low-pressure turbine shaft positioning tool; 9. a torque multiplier; 41. a fan tray; 42. a fan shaft; 51. positioning the shaft; 52. a traction shaft; 53. a handle; 54. positioning blocks; 55. an adjustment key; 56. a pin shaft; 57. an adjustment shaft; 58. adjusting a rod; 59. a threaded rod; 571. a threaded hole; 572. a conical surface; 61. a guide shaft sleeve; 62. a torque transmission bushing; 63. a traction assembly; 631. connecting the shaft sleeve; 632. a traction shaft sleeve; 64. a pin; 65. a spline; 66. a screw; 67. a threaded segment; 68. a connecting rod; 69. positioning pins; 70. a locking mechanism; 81. a stator positioning plate; 82. a locking shaft; 83. a rotor connecting shaft; 84. a connecting tile; 91. a switching shaft sleeve; 92. a transfer pin; 701. a locking block; 702. a screw; 703. locking the nut; 704. positioning a rod; 841. fastening the lug bosses; 842. and (5) locking the boss.
Detailed Description
The present invention will now be described in further detail with reference to the attached drawings, which are illustrative, but not limiting, of the present invention.
Referring to fig. 1-11, an assembly tool for a low-pressure turbine of an engine comprises a positioning guide tool 5, a traction tool 6 and a torque multiplier 9.
The positioning and guiding tool 5 is coaxially connected with a low-pressure turbine shaft of the low-pressure turbine 1, the traction tool 6 is installed on the fan rotor 4, and the positioning and guiding tool 5 penetrates through the core machine 3 and the axis of the fan rotor 4 to be connected with the torque multiplier 9.
The positioning and guiding tool 5 comprises a positioning shaft 51, a traction shaft 52, an adjusting shaft 57 and an adjusting rod 58.
The traction shaft 52 and the positioning shaft 51 are hollow shafts, one end of the positioning shaft 51 is embedded in one end of the traction shaft 52 and coaxially arranged, the adjusting shaft 57 is arranged in the positioning shaft and can move along the axial direction of the positioning shaft, one end of the adjusting shaft 57 is provided with a threaded hole 571, the adjusting rod 58 is coaxially arranged in the traction shaft 52, one end of the adjusting shaft is provided with a threaded rod 59, the threaded rod 59 is connected with the threaded hole 571, the other end of the adjusting shaft extends out of the traction shaft 52, a shaft cover is sleeved at the position, extending out of the traction shaft, of the adjusting rod 58 and abutted against a shaft shoulder of the adjusting rod and fixed at the end of the traction shaft, the end of the adjusting rod extends out of the shaft cover and is fixedly connected with the handle 53, the adjusting rod is adjusted to rotate by rotating the handle, and the shaft shoulder and the handle 53 axially limit the adjusting rod 58.
The positioning shaft 51 is circumferentially and uniformly distributed with a plurality of key grooves arranged along the axial direction, each key groove is internally provided with an adjusting key 55, the middle part of each adjusting key is rotatably connected with the positioning shaft 51 through a pin shaft 56, and each adjusting key can rotate at a certain angle along the pin shaft 56, so that the two ends of each positioning key can alternatively rotate to the outside of the positioning shaft.
The adjusting shaft is of a dumbbell-shaped structure and comprises a connecting rod and cylindrical guide blocks symmetrically fixedly connected to two ends of the connecting rod, two opposite end faces of the two guide blocks are conical surfaces 572, the adjusting key is positioned between the two guide blocks, two ends of the adjusting key 55 are both inclined surfaces, the angles of the inclined surfaces of the adjusting key 55 and the inclined surfaces of the guide blocks are the same, and the positioning block is assembled in a shaft hole of the positioning shaft; the adjusting shaft 57 moves toward the handle side, the tapered surface near one end of the positioning shaft presses the inclined surface at the end of the adjusting key, so that the adjusting key rotates along the pin shaft 56, and the end part extends out of the positioning shaft, when the end part of the adjusting key needs to be rotated into the positioning shaft, the handle is rotated reversely to enable the adjusting shaft to move axially reversely, namely, the positioning shaft 51 is moved to one side, so that the conical surface of the other positioning block of the adjusting shaft extrudes the inclined surface of the other end of the adjusting key 55, the other end of the adjusting key is gradually rotated to the inside of the positioning shaft, the positioning shaft conveniently extends into the shaft hole of the low-pressure turbine shaft, one end of the adjusting key is rotated to the outer side of the positioning shaft, and the end parts of the plurality of adjusting keys apply thrust to the inner wall of the low-pressure turbine shaft to form annular tension, so that the positioning shaft 51 is coaxially and fixedly connected with the low-pressure turbine shaft.
The circumference equipartition has a plurality of draw-in grooves on the outer wall of the link of traction shaft 52 and location axle, has all inlayed locating piece 54 in every draw-in groove to through the screw fixation, the top surface of locating piece 54 radially extends, and is higher than the outer wall of traction shaft, and the height of locating piece and the outer wall height of traction shaft are less than the wall thickness of low pressure turbine shaft tip, the quantity of locating piece and the quantity phase-match of low pressure turbine shaft tip constant head tank, locating piece 54 can join in marriage the dress in the constant head tank.
The following describes the installation process of the positioning and guiding tool in detail.
The low-pressure turbine shaft is a rotor shaft of the low-pressure turbine, the structure of the low-pressure turbine shaft is a hollow structure, a plurality of positioning grooves are uniformly distributed on the circumference of the end surface of the connecting end of the low-pressure turbine shaft and the core machine, the positioning grooves radially penetrate through the shaft wall and axially extend, and the low-pressure turbine 1 is horizontally arranged on the horizontal lifting appliance 2 with the adjustable gravity center before the positioning guiding tool is installed.
When the positioning device is installed, the handle 53 is driven, the adjusting shaft 57 is controlled to move towards one side of the positioning shaft 51 through the adjusting rod, and the conical surface of the adjusting shaft close to one side of the handle gradually presses the inclined surface of the end part of the adjusting key 55, so that the adjusting key rotates to the inside of the positioning shaft.
Then, the positioning shaft 51 extends into the shaft hole of the low-pressure turbine shaft until the positioning block 54 is clamped into the positioning groove at the end part of the low-pressure turbine shaft, the outer diameter of the positioning shaft 51 is matched with the inner diameter of the shaft hole of the low-pressure turbine shaft, and the positioning guide tool 5 and the low-pressure turbine shaft are positioned coaxially and radially through the positioning shaft and the positioning block.
Finally, the handle 53 is driven reversely, the adjusting shaft moves towards one side of the handle through threads, the conical surface of the adjusting shaft close to one side of the positioning shaft 51 gradually extrudes the inclined surface of the end part of the adjusting key 55, the end part of the adjusting key rotates to the outside of the positioning shaft, namely, the end part of the adjusting key extends out of the outer wall of the positioning shaft and abuts against the inner wall of the low-pressure turbine shaft, the adjusting keys apply tension force to the inner wall of the low-pressure turbine shaft, the positioning shaft is connected with the low-pressure turbine shaft, and then the connection of the positioning guide tool 5 is completed.
Because the low-pressure turbine shaft on the low-pressure turbine is long, the front end of the low-pressure turbine is not provided with a centering device, the axial centering is poor, the low-pressure turbine shaft cannot be in a horizontal state, namely cannot be coaxial with a core machine, and because the clearance between a cylindrical roller and an outer ring of the bearing is small, when the low-pressure turbine unit body is pushed into the core machine, the bearing roller interferes with the outer ring, so that the roller and the outer ring are rubbed and abraded during assembly; at the moment, the compression nut is screwed, the low-pressure turbine is directly pulled to move forwards in a mechanical mode, and the roller and the outer ring are further damaged, so that in order to avoid assembly errors caused by inclination of the low-pressure turbine shaft and non-coaxial movement of the core machine, the low-pressure turbine shaft positioning tool 8 is installed at the rear end of the low-pressure turbine, the low-pressure turbine shaft is in a horizontal state, loss of a bearing in the assembly process is reduced, and the low-pressure turbine shaft positioning tool 8 is structurally as follows:
the low-pressure turbine shaft positioning tool 8 comprises a stator positioning disc 81, a locking shaft 82, a rotor connecting shaft 83 and a connecting tile 84.
The connecting tile 84 is used for being clamped in an inwards concave clamping groove of an inner hole of the low-pressure turbine shaft and is of an arc tile structure, a radially extending fastening boss 841 is arranged at the end part of an outer arc surface of the connecting tile and used for being fastened in the clamping groove of the low-pressure turbine shaft, the other end of the connecting tile extends to the outside of the low-pressure turbine shaft, a radially extending locking boss 842 is arranged on the outer wall of the end part and used for being connected with the rotor connecting shaft 83.
A plurality of connecting tiles are buckled in an inwards concave clamping groove of the low-pressure turbine shaft at intervals in the circumferential direction, the outer wall of each connecting tile 84 is tightly attached to the inner wall of the low-pressure turbine shaft, a containing space of the rotor connecting shaft 83 is formed between the inner walls of the connecting tiles, one end of the rotor connecting shaft 83 extends into the containing space, the connecting tiles are supported in an inner hole of the low-pressure turbine shaft, a convex ring is arranged in the middle of the outer wall of the rotor connecting shaft 83, a locking boss 842 of each connecting tile is connected with the convex ring through a bolt, and coaxial connection of the rotor connecting shaft 83 and the low-pressure.
The width of the connecting tile is smaller than the diameter of the inner hole of the low-pressure turbine shaft, so that each connecting tile can be inserted into the inner hole of the low-pressure turbine shaft.
The other end of the rotor connecting shaft 83 is of a closed structure, a shaft hole matched with the rotor connecting shaft 83 is formed in the shaft center of the locking shaft 82, the locking shaft 82 is sleeved at the end portion of the rotor connecting shaft 83 in a hollow mode, the shaft shoulder of the shaft hole abuts against the end portion of the rotor connecting shaft 83, the stator positioning disc 81 is sleeved on the connecting shaft 83 through threads, a flange plate is arranged at one end, close to the low-pressure turbine, of the stator positioning disc 81, the position of the stator positioning disc 81 is adjusted through threads, the flange plate abuts against the end face of the stator of the low-pressure turbine, and the flange plate is connected with the stator. The stator positioning disc 81 adopts threads to adjust the axial position, so that the low-pressure turbine shaft positioning tool 8 can be suitable for low-pressure turbines of different specifications.
The inner hole of the locking shaft 82 is provided with a bolt, the locking shaft 82 is fixedly connected with the rotor connecting shaft 83 through the bolt, certain axial tension is applied to the rotor connecting shaft 83, axial thrust is applied to the stator positioning disc 81, the rotor connecting shaft 83 and the stator positioning disc 81 are connected to form a whole, coaxial positioning is achieved, and the problem of collision caused by the coaxiality of a low-pressure turbine shaft during bearing installation is avoided.
The traction tool 6 is used for being connected with the fan rotor 4, and the fan rotor 4 comprises a fan disc 41 and a hollow fan shaft 42 coaxially connected with the fan disc 41.
The traction tool 6 comprises a guide shaft sleeve 61, a torque transmission bushing 62, a traction assembly 63 and a guide device 7.
The guiding shaft sleeve 61 comprises a shaft sleeve and a flange plate arranged at the end part of the guiding shaft sleeve, the shaft sleeve is used for being sleeved in inner holes of the fan disc 41 and the fan shaft 42, the shaft sleeve is meshed with splines in the middle of the fan shaft 42, the circumferential and coaxial positioning of a shaft sleeve fan rotor is achieved, and the flange plate is located on the end face of the fan disc 41 and is fixedly connected with the fan disc 41 through a plurality of locking mechanisms 70.
A guide sleeve is embedded at the other end of the guide shaft sleeve 61, and the inner hole of the guide sleeve has the same outer diameter as the traction shaft 52 and is used for coaxially positioning the traction shaft 52.
The locking mechanism 70 comprises a locking block 701, a screw 702 and a locking nut 703, the screw 702 is axially installed on the flange plate, the locking block 701 is fixedly connected to the end portion of the screw 702, the locking nut 703 is arranged on the screw 702 through threads and located on the outer side of the flange plate, the locking block is located in the fan, the end face of the locking block is used for being fastened to a seam allowance of the inner wall of the fan disc 41, the locking nut 703 is rotated to enable the screw to move towards one side of the fan disc, the locking nut 703 abuts against the end face of the fan disc, and the locking block 701 is fastened to the seam allowance, so that the guide shaft sleeve is fixedly connected with the fan disc.
Furthermore, in order to ensure the coaxial connection between the guide shaft sleeve 61 and the fan disc 41, an axial positioning rod 704 is arranged on the inner wall of the flange plate, a screw rod penetrates through the positioning rod 704 to be connected with the locking block, the diameter formed by the positioning rods is the same as the inner diameter of the fan disc, and the coaxial positioning between the guide shaft sleeve 61 and the fan disc is realized.
The outer wall of the positioning rod 704 is provided with a cambered surface matched with the inner wall of the fan disc, when the fan disc fixing device is installed, the screw rod rotates the locking block 701, the locking block 701 and the spigot contact end rotate to the center of the flange plate, then the positioning rod stretches into the fan disc along the inner wall of the fan disc until the end face of the flange plate abuts against the end face of the fan disc, the screw rod 702 is rotated again, the press-fitting face of the locking block 701 is opposite to the spigot, finally the locking nut 703 is rotated, the press-fitting face of the locking block 701 abuts against the spigot, and the fan disc is fixedly connected with the guide shaft sleeve.
The torque transmission bush 62 is coaxially sleeved in the shaft sleeve of the guide shaft sleeve 61, a positioning ring is arranged at the end part of the torque transmission bush 62, the positioning ring is connected with a flange of the torque transmission bush 62 through a bolt, and a threaded section 67 is arranged on the inner wall of the torque transmission bush 62.
The traction assembly 63 comprises a traction shaft sleeve 632, the outer wall of the traction shaft sleeve 632 is provided with external threads matched with the thread sections of the torque transmission bushing 62, one end of the traction shaft sleeve 632 extends into the torque transmission bushing 62 and is connected through threads, the other end of the traction shaft sleeve 632 is positioned outside the torque transmission bushing 62, the end part of the traction shaft sleeve is empty and sleeved with a connection shaft sleeve 631, a bearing is arranged between the connection shaft sleeve 631 and the traction shaft sleeve 632, the connection shaft sleeve 631 is connected with the traction shaft sleeve 632 through the bearing, and a pin hole is formed in the connection shaft sleeve 631 and used for being connected with a traction.
Before the core machine and the low-pressure turbine are assembled, the traction sleeve 632 is screwed completely into the torque transmission bushing 62, so that it can be ensured that the low-pressure turbine has a sufficiently large axial travel distance during the assembly process, avoiding problems of insufficient travel distance, which leads to assembly failures.
The connecting shaft sleeve 632 is further provided with a guide device 7 below, the guide device 7 is supported on the ground, the guide device 7 is provided with a first guide arm and a second guide arm, the first guide arm can move up and down along the guide device, the first guide arm is of an L-shaped structure, the vertical end of the first guide arm is movably connected with the guide device 7 and used for adjusting the height of the first guide arm, the horizontal end of the first guide arm is connected with the traction shaft sleeve 632, the traction shaft sleeve 632 is provided with a connecting rod 68, the traction shaft sleeve 632 is connected with the first guide arm through the connecting rod 68 and can move axially along the horizontal end of the first guide arm, and meanwhile, the first guide arm circumferentially positions the traction shaft sleeve 632.
Further, an axial sliding groove is formed in the horizontal end of the first guide arm, the lower end of the connecting rod is assembled in the sliding groove, the traction shaft sleeve 632 is circumferentially positioned, and meanwhile the traction shaft sleeve 632 can circumferentially move along the sliding groove, so that the positioning guide tool 5 is driven to axially move.
The second guide arm horizontally extends to one side of the torque multiplier, a guide groove is formed in the second guide arm, a guide rod is arranged at the bottom of the shell of the torque multiplier, and the lower end of the guide rod is assembled in the guide groove, so that the circumferential positioning of the torque multiplier is realized, and the torque multiplier can axially move along the guide groove.
When the low-pressure turbine and the core machine are assembled, the traction shaft 52 of the positioning and guiding tool 5 sequentially penetrates through the core machine 3 and the connecting shaft sleeve 631, the end part of the traction shaft 52 extends out of the connecting shaft sleeve 631, the traction shaft 52 is connected with the connecting shaft sleeve 631 by a quick-release positioning pin to realize synchronous rotation, and the end part of the traction shaft 52 extending out of the connecting shaft sleeve 631 is connected with the torque multiplier 9 and used for applying a rotating force to the traction shaft to enable the traction shaft to rotate.
The output end of the torque multiplier 9 is provided with a switching shaft sleeve 91, the switching shaft sleeve 91 is sleeved on the traction shaft 52 and is connected by a switching pin 92, and meanwhile, in order to ensure that the adjusting rod 58 is loosened in the rotating process to cause the adjusting key to be separated from the low-pressure turbine shaft, the handle is connected with the switching shaft sleeve 91 by a quick-release pin.
The use method of the assembly tool for the low-pressure turbine of the engine provided by the invention is explained in detail below.
Referring to fig. 1, in step 1, a fan rotor 4, a core machine 3 and a low-pressure turbine 1 are sequentially arranged, the low-pressure turbine 1 is horizontally suspended on an adjustable gravity center horizontal lifting appliance 2, the core machine 3 and the low-pressure turbine 1 are arranged on the ground through a support frame, and the fan rotor 4, the core machine 3 and the low-pressure turbine 1 are coaxially arranged.
And 2, extending the positioning shaft 51 of the positioning guide tool 5 into the shaft hole of the low-pressure turbine shaft, and locking the positioning shaft through an adjusting key.
The installation process of the positioning and guiding tool 5 with the low-pressure turbine shaft has been described in detail above and will not be described in detail here.
A positioning guide tool 5 is arranged at the front end of the low-pressure turbine shaft, and the front end of the low-pressure turbine shaft can be connected with a traction tool 6 on a fan rotor 4 before the combination of the inner ring and the outer ring of the No. 4 bearing is ensured; a traction tool 6 is arranged at the front end of the fan rotor 4 to ensure that the low-pressure turbine generates forward traction force in the axial direction when in rotary butt joint, and a low-pressure turbine shaft positioning tool 8 is arranged at the rear end of the low-pressure turbine to realize the coaxial positioning of the low-pressure turbine shaft and the stator and ensure the synchronous butt joint of the low-pressure turbine rotor and the stator.
And 3, installing the traction tool 6 on the fan rotor, wherein the specific installation structure is described in detail above and is not described again.
It should be noted that, in this step, the depth of the traction sleeve 632 screwed into the torque transmission bushing 62 needs to be controlled to ensure the moving distance of the traction sleeve 632 to the side of the torque multiplier to realize the butt joint of the low-pressure turbine and the core engine in the process of assembling the bearing.
And 4, horizontally moving the low-pressure turbine by using a lifting appliance, enabling a traction shaft 52 of the positioning and guiding tool to sequentially pass through the core machine 3, the fan shaft 42 and the fan disc 41, enabling the end part of the traction shaft 52 to extend out of the fan disc, enabling a low-pressure turbine shaft to pass through the core machine and extend into the fan shaft 42 and be connected through a spline, and then connecting the traction shaft 52 with a connecting shaft sleeve 631 through a positioning pin.
And 4, mounting the torque multiplier 9 at the end part of the traction shaft 52, sleeving the adapter shaft sleeve 91 on the traction shaft, and connecting the adapter shaft sleeve 91 with the adjusting rod 58 and the traction shaft through the adapter pin respectively to realize synchronous rotation.
And 5, installing a guide device 7 at the lower part of the traction shaft sleeve 632, adjusting the first guide arm to be connected with the connecting rod 68 on the traction shaft sleeve 632, and simultaneously connecting the guide rod of the torque multiplier with the second guide arm.
Through the process, the preparation work of the positioning and guiding tool 5, the traction tool 6, the low-pressure turbine 1, the core machine 3 and the fan rotor 4 before the bearing assembly is completed.
And 6, starting the torque multiplier 7, and connecting the torque multiplier 7 with the traction shaft 52 through the adapter sleeve 91, so that the traction shaft synchronously rotates.
Then, the traction shaft is connected with the low-pressure turbine shaft through the positioning shaft 51, so that the low-pressure turbine shaft is driven to rotate, meanwhile, the low-pressure turbine shaft is connected with the fan shaft through a spline, the fan shaft is fixedly connected with the fan disc, and then the low-pressure turbine shaft drives the fan shaft 42 and the fan disc 41 to synchronously rotate, namely, the fan rotor rotates.
Then, since the torque transmission bush 62 is fixed to the guide sleeve 61 and the guide sleeve 61 is fixed to the fan rotor 4 by the locking mechanism 70 and the spline, the fan rotor 4 drives the guide sleeve 61 and the torque transmission bush 62 to rotate synchronously.
Finally, since the torque transmission bushing 62 is connected to the traction sleeve 632 through the threaded section 67, and the traction sleeve 632 is connected to the guide device through the connecting rod 68 to circumferentially position the traction sleeve 632 only in the axial direction, the torque transmission bushing 62 axially moves the traction sleeve 632 through the threads during rotation, the traction sleeve 632 is connected to the traction shaft 52 through the coupling sleeve 631, and the low pressure turbine 1 is moved toward the core machine 3 through the traction shaft 52 and the positioning shaft 51.
The bearing inner ring, the retainer and the bearing cylindrical roller are arranged on the low-pressure turbine shaft, so that the bearing inner ring, the retainer and the bearing cylindrical roller are horizontally arranged in the bearing outer ring of the core machine in a rotating and axial moving state to complete the installation of the bearing, and the core machine is kept still in the installation process.
And 7, removing the torque multiplier 9 and the guide device 7, rotating the adjusting rod 58 to enable the adjusting key to be retracted into the positioning shaft 51, drawing out the positioning guide tool 5 from the end part of the fan rotor, rotating the locking nut 703 of the locking mechanism 70 to enable the locking block 701 to be separated from the spigot of the fan disc, then rotating the screw rod to enable the press-fitting part of the locking block 701 to face the center of the flange plate, and drawing out the traction tool 6 from the end part of the fan rotor 4.
The assembly method of the invention changes the prior direct traction butt joint assembly mode and adopts a rotary butt joint mode. Before the bearing contacts the bearing outer ring, the front end of the low-pressure turbine shaft is centered with the front end of the fan casing, so that the concentricity of all assembling parts in the butt joint process is ensured; and during the rotation assembly, the bearing cylindrical rollers rotate along with the low-pressure turbine shaft, and in the process of slowly screwing in the low-pressure turbine, the cylindrical rollers rotate along with the low-pressure turbine shaft, and when the cylindrical rollers contact the outer ring of the bearing, the cylindrical rollers are sequentially lifted in a spiral line shape by the outer ring under the contact surface, and the cylindrical rollers of the bearing are radially inwardly tightened, so that the phenomenon that circumferential gaps generated by the gravity of the rollers are uneven is eliminated, and the rollers can smoothly enter the outer ring of the bearing.
The assembly method can solve the problems of engine metal scrap alarm, low-pressure rotor rotation clamping stagnation and the like caused by the 4-fulcrum bearing of 50 percent of engines, and effectively avoids the engine faults caused by the damage of the 4-fulcrum bearing after the assembly method is adopted. The metal scrap alarm of each engine and the running clamping of the low-pressure rotor cause unqualified test run, and the cost for troubleshooting is about 100 ten thousand yuan; the assembly method of the invention not only saves a great deal of troubleshooting cost, but also saves time, effectively improves the production efficiency and enables the engine to be delivered in time.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (9)
1. The positioning and guiding tool for the low-pressure turbine of the engine is characterized by comprising a traction shaft (52) and a positioning shaft (51) which is arranged at the end part of the traction shaft and axially extends, wherein the positioning shaft (51) is used for extending into an inner hole of a low-pressure turbine shaft, so that the traction shaft (52) and the low-pressure turbine shaft are coaxially arranged;
the positioning shaft (51) is provided with a locking structure, and when the positioning shaft (51) extends into an inner hole of the low-pressure turbine shaft, the locking structure is used for axially positioning the traction shaft (52);
the locking structure comprises an adjusting shaft (57) and a plurality of adjusting keys (55);
a plurality of key grooves arranged along the axial direction are circumferentially arranged on the shaft wall of the positioning shaft (51) at intervals, and the adjusting keys (55) are rotationally arranged in the key grooves;
the adjusting shaft (57) is arranged in a shaft hole of the positioning shaft and can axially move, an inward concave space is formed in the side wall of the adjusting shaft (57), the side wall, close to the shaft center, of the adjusting key extends into the inward concave space, the adjusting shaft (57) axially moves to extrude the end part of the adjusting key, so that the stressed end of the adjusting key rotates to the outside of the positioning shaft and is abutted against the inner wall of the low-pressure turbine shaft;
when assembled, the trailing end of the trailing shaft (52) passes through the core and fan rotor and is located outside the fan rotor.
2. The positioning and guiding tool for the low-pressure turbine of the engine as claimed in claim 1, wherein symmetrical guide surfaces are arranged at two ends of the concave space, and the guide surfaces press the end of the adjusting key to enable the adjusting key to rotate.
3. The positioning and guiding tool for the low-pressure turbine of the engine as claimed in claim 2, wherein the two ends of the adjusting key are inclined surfaces matched with the guide surfaces.
4. The positioning and guiding tool for the low-pressure turbine of the engine as claimed in claim 1, wherein the recessed space is an annular groove axially formed in the adjusting shaft (57).
5. The positioning and guiding tool for the low-pressure turbine of the engine as claimed in claim 1, wherein the end of the adjusting shaft (57) is connected with one end of the adjusting rod (58) through a thread, the other end of the adjusting rod (58) extends out of the traction shaft, the adjusting rod (58) is connected with the traction shaft (52) through an axial limiting mechanism, and the adjusting rod can rotate to enable the adjusting shaft (57) to move axially through the thread.
6. The positioning and guiding tool for the low-pressure turbine of the engine as claimed in claim 5, wherein the axial limiting mechanism is a positioning ring disposed at an end of the adjusting rod and a shaft cover fixedly connected to an end of the traction shaft, the positioning ring abuts against an inner wall of the shaft cover, and an end of the adjusting rod extends out of the shaft cover and is fixedly connected to the handle.
7. The positioning and guiding tool for the low-pressure turbine of the engine as claimed in claim 1, wherein a plurality of positioning blocks for matching with positioning grooves at the end of the low-pressure turbine shaft are arranged on the outer wall of the traction shaft (52) to realize circumferential positioning of the traction shaft and the low-pressure turbine shaft.
8. The positioning and guiding tool for the low-pressure turbine of the engine as claimed in claim 7, wherein a plurality of slots are circumferentially formed at an end of the outer wall of the traction shaft, one end of the positioning block is fitted in the slot, and the other end of the positioning block extends along a radial center line of the traction shaft to an end far away from a center of the shaft.
9. The positioning and guiding tool for the low-pressure turbine of the engine as claimed in claim 1, wherein one end of the traction shaft, which is located outside the fan rotor, is connected with a torque multiplier for applying torque to the traction shaft so that the traction shaft and the low-pressure turbine rotate synchronously.
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| CN202010245691.7A CN111376016B (en) | 2020-03-31 | 2020-03-31 | Positioning and guiding tool for low-pressure turbine of engine |
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| CN202010245691.7A CN111376016B (en) | 2020-03-31 | 2020-03-31 | Positioning and guiding tool for low-pressure turbine of engine |
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| CN111376016B true CN111376016B (en) | 2021-03-02 |
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| EP4191030A1 (en) * | 2021-12-01 | 2023-06-07 | Pratt & Whitney Canada Corp. | Aircraft engine repair tool and method for removal and installation of a mid turbine frame |
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| CN112510929B (en) * | 2020-11-25 | 2023-07-07 | 中国航发沈阳黎明航空发动机有限责任公司 | Blind cavity structure interference fit rotor cold-assembling elastic guide device for assembly |
| CN115041934B (en) * | 2021-03-09 | 2023-09-26 | 中国航发商用航空发动机有限责任公司 | Horizontal assembling method and assembling system for main unit body of low-pressure turbine of aero-engine |
| CN113580053B (en) * | 2021-08-19 | 2022-11-29 | 中国航发沈阳黎明航空发动机有限责任公司 | Engine turbine assembly horizontal assembling device and using method thereof |
| CN114136266B (en) * | 2021-10-20 | 2023-06-30 | 中国航发四川燃气涡轮研究院 | Coaxiality detection method for double-rotor aeroengine |
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