CN112207760B - Vertical low-pressure turbine unit assembling device and assembling method thereof - Google Patents
Vertical low-pressure turbine unit assembling device and assembling method thereof Download PDFInfo
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- CN112207760B CN112207760B CN201910613809.4A CN201910613809A CN112207760B CN 112207760 B CN112207760 B CN 112207760B CN 201910613809 A CN201910613809 A CN 201910613809A CN 112207760 B CN112207760 B CN 112207760B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
- B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
Abstract
The invention provides a vertical low-pressure turbine unit body assembling device and an assembling method thereof, wherein the assembling device comprises: the assembly platform comprises an upper frame and a lower frame which are fixedly connected up and down to form a hollow frame structure; the limiting plate is arranged above the upper frame, and the tightening wrench is arranged on the lower end surface of the limiting plate; the pressing measuring device is arranged on the inner bottom surface of the lower frame and is positioned right below the upper frame, one end of the scale is arranged on the upper frame, and the other end of the scale extends downwards; the low-pressure turbine shaft is fixed up and down through the compression measuring device and the tightening wrench, the stator of the low-pressure turbine shaft is fixed on the upper frame, and the upper end of the scale is fixed on the upper frame and vertically extends downwards. The invention adopts a vertical assembly method, has simple principle, is easy to center, and meets the requirement of assembling the low-pressure turbine unit body according to the drawing; the assembling operation process is simple and stable, the repeatability is good, and the assembling quality of the low-pressure turbine is stable.
Description
Technical Field
The invention relates to the field of assembly of aero-engines, in particular to a vertical low-pressure turbine unit body assembly device and an assembly method thereof.
Background
Fig. 1 is a schematic structural diagram of a low-pressure turbine in the prior art. FIG. 2 is a first vertical assembly diagram of a low-pressure turbine in the prior art. Fig. 3 is a schematic diagram of vertical assembly of a low-pressure turbine in the prior art. Fig. 4 is a schematic diagram of H2 size measurement in the prior art.
As shown in fig. 1 to 4, the model low-pressure turbine unit body is composed of three subunits, namely a low-pressure turbine shaft 10, a rotor stator 20 and a turbine rear casing 30. An inner cylindrical surface A and a front end surface B of a first-stage turbine disk center in the rotor and stator 20 are assembly references of the whole unit body, and the low-pressure turbine shaft 10 is connected with a support conical wall in the rotor and stator 20 through short fastening-port bolts. In order to ensure reliable connection of the rotor and stator 20 to the low-pressure turbine shaft 10, a torque is applied during tightening of the fixing nut of the short bolt. The rotor and stator 20 unit body is composed of a rotor (multistage vane) and a stator (multistage stationary vane), and in order to avoid direct collision between the rotor and the stator in the installation process, the axial gap and the radial gap of the rotor and the stator 20 need to be controlled.
The five-fulcrum bearing inner ring of the engine is arranged at the tail end of the supporting conical wall, the bearing inner ring is pressed against the supporting conical wall by virtue of a compression nut, and the bearing inner ring is screwed up in a force-limiting manner according to specified torque in the compression process. The five-fulcrum bearing outer ring of the engine is arranged on the turbine rear casing 30, the radial clearance between the inner ring and the outer ring of the five-fulcrum bearing is small, the relative position of the inner ring and the outer ring of the bearing cannot be seen in the installation process of the turbine rear casing 30, and the risk that the inner ring and the outer ring of the bearing collide with each other is large.
In order to ensure that the axial clearance of the low-pressure turbine runner and the stator meets the requirement in the complete machine state of the engine, the H1 value needs to be measured under the condition that the H2 size shown in figure 1 is ensured in the assembling process, and then the front adjusting pad of the low-pressure turbine runner and the stator is selected to control the axial clearance of the low-pressure turbine runner and the stator according to the H1 value.
In addition, because the rotor and the stator of the low-pressure turbine are delivered as a unit body, and only one hole detector hole is formed in each stage of stator of the low-pressure turbine, the flow channel of each stage of rotor and stator needs to be completely inspected before the low-pressure turbine is assembled, foreign bodies are prevented from being in the flow channel, and a rotor needs to be capable of rotating in the inspection process.
For the assembly of the low-pressure turbine unit bodies with the models, how to control the axial clearance between the rotors and the stators, ensure the concentricity of the rotors and the stators and ensure the reliable connection between the sub-assembly unit bodies is the key and difficult point of the assembly.
In view of the above, those skilled in the art have developed an assembling apparatus for a vertical low pressure turbine unit and an assembling method thereof, in order to overcome the above-mentioned technical problems.
Disclosure of Invention
The invention aims to overcome the defect that the axial clearance between rotors is difficult to control in the assembly of low-pressure turbine units in the prior art, and provides a vertical low-pressure turbine unit assembly device and an assembly method thereof.
The invention solves the technical problems through the following technical scheme:
the utility model provides a vertical type low pressure turbine unit body assembly quality which characterized in that, vertical type low pressure turbine unit body assembly quality includes: the assembly platform comprises an upper frame and a lower frame, and the upper frame and the lower frame are fixedly connected up and down to form a hollow frame structure;
the limiting plate is arranged above the upper frame, and the tightening wrench is arranged on the lower end surface of the limiting plate; the compression measuring device is arranged on the inner bottom surface of the lower frame and is positioned right below the upper frame, one end of the scale is arranged on the upper frame, and the other end of the scale extends downwards;
a low-pressure turbine shaft is vertically fixed through the compression measuring device and the tightening wrench, a low-pressure turbine rotor and a low-pressure turbine stator are fixed on the upper frame, and the upper end of the scale is fixed on the upper frame and vertically extends downwards.
According to one embodiment of the invention, the upper frame comprises a supporting frame, a centering ring, an upper clamping ring and a lower clamping ring, wherein the supporting frame is a hollow annular frame with an upper layer and a lower layer;
the center of the hollow annular frame extends downwards to form a hollow cylinder, and the upper clamping ring and the lower clamping ring are respectively installed at the upper end part and the lower end part of the hollow cylinder and used for clamping the low-pressure turbine shaft so that the low-pressure turbine shaft is positioned on the axis of the assembling platform;
the centering ring is fixed at the central position of the upper end face of the supporting frame and surrounds the upper end part of the hollow column body.
According to one embodiment of the invention, the upper frame further comprises a stator fixing ring, a bearing lower seat, a bearing rolling body and a bearing upper seat, wherein the stator fixing ring is fixed on the supporting frame and used for fixing a front mounting flange of the turbine casing;
the bearing upper seat and the bearing lower seat are vertically overlapped and fixed on the outer side part of the centering ring, and the bearing rolling body is arranged between the bearing upper seat and the bearing lower seat.
According to one embodiment of the invention, a fixing bracket is arranged on the upper end face of the bottom of the lower frame, and the fixing bracket is positioned right below the lower clamping ring;
the compression measuring device comprises a reverse-twisting sleeve, a measuring plate, a compression nut and a lifting screw rod, wherein the lifting screw rod is fixed at the central position of the fixing bracket, the compression nut is installed on the lifting screw rod, the measuring plate is installed on the compression nut, and the reverse-twisting sleeve is sleeved on the periphery of the measuring plate, the compression nut and the lifting screw rod and fixed on the fixing bracket.
According to one embodiment of the invention, the anti-torsion sleeve is of a fan-shaped cylinder structure and is fixed on the fixing bracket, and splines are arranged in the anti-torsion sleeve and are matched with the splines at the front end of the low-pressure turbine shaft.
According to one embodiment of the invention, the upper frame further comprises at least two fixing seats, the fixing seats are fixed on the outer side of the upper end face of the supporting frame, the fixing seats are arranged in a 180-degree symmetric manner in pairs, and the limiting plates are fixed between the two corresponding fixing seats.
According to one embodiment of the present invention, the tightening wrench includes a wrench head, a plurality of lifting rods mounted on the wrench head, and a torque multiplier mounted between the lifting rods.
According to one embodiment of the invention, the limit plate is provided with a stop, and the stop is mounted on the fixed wrench and used for limiting the handle of the torque amplifier.
According to one embodiment of the invention, the end of the scale is provided with a ball head.
The invention also discloses a vertical low-pressure turbine unit body assembling method which is characterized in that the assembling method adopts the vertical low-pressure turbine unit body assembling device, and the method comprises the following steps:
S1mounting the low-pressure turbine shaft on the assembly platform, and adjusting the low-pressure turbineThe position of the axle;
S2mounting the low-pressure turbine rotor stator on an assembly platform, and adjusting the positions of the low-pressure turbine shaft and the low-pressure turbine rotor stator so that the low-pressure turbine shaft and the low-pressure turbine rotor stator are in butt joint;
S3rotating the low-pressure turbine rotor, and detecting whether the runout value of the turbine disk center and the front fit cylindrical surface of the low-pressure turbine shaft conforms to a design value through a dial indicator; if not, separating the rotor and the stator of the low-pressure turbine from the low-pressure turbine shaft, adjusting and then butting again; installing the low-pressure turbine shaft and other connecting nuts of the low-pressure turbine rotor stator until the design value is met;
S4the low-pressure turbine shaft and the low-pressure turbine rotor and stator are fixedly installed;
S5mounting a turbine rear casing on a rear flange of the low-pressure turbine rotor and stator through a lifting appliance;
S6measuring the axial distance between the ball head part of the scale and the measuring plate through the standard measuring block, wherein the axial distance is H measurement;
S7and H2 is calculated as H axis- (H mark + H measurement), the value of the H axis can be measured through three coordinates, and the value of the H mark is the factory metering value of the assembly platform.
According to an embodiment of the invention, said step S1Further comprising the steps of:
S11fixing the measuring plate on the mounting surface of the adjusting pad of the low-pressure turbine shaft through a compression nut, and checking whether the measuring plate is attached to the mounting surface of the adjusting pad of the low-pressure turbine shaft through a feeler gauge;
S12mounting the low-pressure turbine shaft on an assembly platform and clamping the low-pressure turbine shaft through an upper clamping ring and a lower clamping ring;
S13lowering the low-pressure turbine shaft to the lowest position by adjusting the lifting screw rod;
S14and heating the rear connecting flange of the low-pressure turbine shaft to 150 ℃ by a heating gun.
According to an embodiment of the invention, said step S2Further comprising the steps of:
S21placing the low-pressure turbine rotor stator on an assembly platform;
S22lifting the low-pressure turbine shaft by adjusting the lifting screw rod, so that a rear connecting flange of the low-pressure turbine shaft is attached to a connecting flange of a support conical wall of a low-pressure turbine shaft rotor;
S23tightening connecting nuts of the low-pressure turbine shaft and the low-pressure turbine rotor and stator in a circumferentially uniform distribution manner;
S24loosening the upper clamping ring and the lower clamping ring;
S25placing dial indicators at the last-stage disk center of the low-pressure turbine rotor stator and the front matching cylindrical surface of the low-pressure turbine shaft;
according to an embodiment of the invention, said step S4Further comprising the steps of:
S41installing five-fulcrum bearing and other parts of the axle center;
S42installing the internal and external compression nuts of the five-fulcrum bearing;
S43installing a back-twist sleeve to limit the rotation of the low-pressure turbine rotor;
S44mounting the limiting plate on the assembling platform;
S45installing a tightening wrench, and limiting the force of the internal and external compression nuts of the five-fulcrum bearing by tightening the wrench to make the internal and external compression nuts meet the design value;
S46after the force limit is qualified, the spanner is screwed down;
S47separating out the limiting plate;
S48and screwing the guide shaft into the threaded hole at the rear end of the rotor-stator support conical wall.
The positive progress effects of the invention are as follows:
the vertical low-pressure turbine unit body assembling method and the assembling device thereof have the following advantages that:
the method adopts a vertical assembly method, has simple principle, is easy to center, and meets the requirement of assembling the low-pressure turbine unit body according to the drawing;
secondly, the assembling operation process is simple and stable, the repeatability is good, and the assembling quality of the low-pressure turbine is stable;
thirdly, the assembly efficiency is high, and the assembly cost is low;
and fourthly, the expansibility of the platform is strong, and the assembly of low-pressure turbine unit bodies of different models and different sizes can be met by replacing functional parts.
Drawings
The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings in which like reference numerals denote like features throughout the several views, wherein:
fig. 1 is a schematic structural diagram of a low-pressure turbine in the prior art.
FIG. 2 is a first vertical assembly diagram of a low-pressure turbine in the prior art.
Fig. 3 is a schematic diagram of vertical assembly of a low-pressure turbine in the prior art.
Fig. 4 is a schematic diagram of H2 size measurement in the prior art.
Fig. 5 is a schematic structural diagram of the vertical low pressure turbine unit assembly apparatus of the present invention.
Fig. 6 is a schematic structural diagram of an assembling platform in the vertical low pressure turbine unit assembling apparatus according to the present invention.
Fig. 7 is a schematic structural view of an upper frame in the vertical low-pressure turbine unit assembling apparatus according to the present invention.
Fig. 8 is a longitudinal sectional view of an upper frame in the vertical low pressure turbine unit body assembling apparatus according to the present invention.
Fig. 9 is a schematic structural view of a lower frame of the vertical low pressure turbine unit assembly apparatus of the present invention.
Fig. 10 is a schematic structural view of a tightening wrench in the vertical low pressure turbine unit assembling apparatus according to the present invention.
Fig. 11 is a schematic structural diagram of a position-limiting plate in the vertical low-pressure turbine unit assembly device according to the present invention.
[ reference numerals ]
Low-pressure turbine shaft 10
Rotor and stator 20
Turbine aft case 30
Tightening wrench 200
Limiting plate 300
Supporting frame 111
Centering ring 112
Lower retaining ring 114
Bearing lower seat 117
Bearing rolling element 118
Bearing upper seat 119
Fixing bracket 121
Measuring plate 510
Lifting screw 530
Fixing seat 600
Lifting rod 220
Stop 310
Handle 231
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.
Further, although the terms used in the present invention are selected from publicly known and used terms, some of the terms mentioned in the description of the present invention may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein.
Furthermore, it is required that the present invention is understood, not simply by the actual terms used but by the meaning of each term lying within.
Fig. 5 is a schematic structural diagram of the vertical low pressure turbine unit assembly apparatus of the present invention. Fig. 6 is a schematic structural diagram of an assembling platform in the vertical low pressure turbine unit assembling apparatus according to the present invention. Fig. 7 is a schematic structural view of an upper frame in the vertical low-pressure turbine unit assembling apparatus according to the present invention. Fig. 8 is a longitudinal sectional view of an upper frame in the vertical low pressure turbine unit body assembling apparatus according to the present invention. Fig. 9 is a schematic structural view of a lower frame of the vertical low pressure turbine unit assembly apparatus of the present invention. Fig. 10 is a schematic structural view of a tightening wrench in the vertical low pressure turbine unit assembling apparatus according to the present invention. Fig. 11 is a schematic structural diagram of a position-limiting plate in the vertical low-pressure turbine unit assembly device according to the present invention.
As shown in fig. 5 to 11, the present invention discloses a vertical low pressure turbine unit body assembling apparatus, which includes: the assembly platform 100, the tightening wrench 200, the limiting plate 300, the compression measuring device and the scale 400. The assembly platform 100 includes an upper frame 110 and a lower frame 120, and the upper frame 110 and the lower frame 120 are fixedly connected to each other to form a hollow frame structure. The stopper plate 300 is installed above the upper frame 110, and the tightening wrench 200 is installed at a lower end surface of the stopper plate 300. The pressing measuring device is installed on the inner bottom surface of the lower frame 120 and is located right below the upper frame 110, and one end of the scale 400 is installed on the upper frame 110 and the other end extends downward. The low-pressure turbine shaft 10 is fixed up and down by the pressing measuring device and the tightening wrench 200, the low-pressure turbine rotor and stator 20 is fixed on the upper frame 110, and the upper end of the scale 400 is fixed on the upper frame 110 and extends vertically downward.
Here, the end of the scale 400 is provided with a ball head for convenient measurement. The scale 400 is used for fixing the height, and the upper end thereof is fixed to the upper frame 110 by a screw.
Preferably, the upper frame 110 includes a support frame 111, a centering ring 112, an upper clamp ring 113, and a lower clamp ring 114, and the support frame 111 is a hollow ring frame having upper and lower double layers. The center of the hollow annular frame extends downwards to form a hollow cylinder 115, and the upper clamping ring 113 and the lower clamping ring 114 are respectively installed at the upper end and the lower end of the hollow cylinder 115 (for example, fixed by bolts) and are used for clamping the low-pressure turbine shaft 10, so that the low-pressure turbine shaft 10 is located on the axis of the assembly platform 100. The centering ring 112 is fixed to the center of the upper end surface of the support frame 111, surrounding the upper end of the hollow cylinder 115. The centering ring 112 may radially constrain the turbine rotor, ensuring that the rotor is on the axis of the mounting platform 100.
Further, the upper frame 110 further includes a stator fixing ring 116, a bearing lower seat 117, a bearing rolling body 118, and a bearing upper seat 119, and the stator fixing ring 116 is fixed to the support frame 111 (e.g., by bolts) for fixing a front mounting flange of the turbine casing. The upper bearing seat 119 and the lower bearing seat 117 are fixed to the outer side of the centering ring 112 in an up-down overlapping manner, and the bearing rolling elements 118 are installed between the upper bearing seat 119 and the lower bearing seat 117. The turbine rotor is fixed to the upper bearing mount 119 for circumferential rotation about the platform axis.
Preferably, the bottom upper end surface of the lower frame 120 is mounted with a fixing bracket 121, and the fixing bracket 121 is located right below the lower clip ring 114. The lower frame 120 is mainly used for supporting the upper frame 110 and the fixing bracket 121, and is mainly a welded body of a plate 122 and a hollow steel pipe 123, and is provided with a lifting point 124 of the platform for lifting and rotating the whole platform.
Further, the compression measuring device includes a torque-reversing sleeve 500, a measuring plate 510, a compression nut 520, and a lifting screw 530. The lifting screw 530 is fixed at the center of the fixing bracket 121, the compression nut 520 is installed on the lifting screw 530, the measuring plate 510 is installed on the compression nut 520, and the anti-twisting sleeve 500 is sleeved on the peripheries of the measuring plate 510, the compression nut 520 and the lifting screw 530 and fixed on the fixing bracket 121.
The fixing bracket 121 is fixed to the lower frame 120 by a screw, and a screw hole is formed in the fixing bracket 121 for mounting the anti-torsion sleeve 500. The compression nut 520 is used for compressing the measurement plate 510, so that the measurement end surface of the measurement plate 500 is attached to the adjustment pad mounting surface of the low-pressure turbine shaft 10. The measurement plate 510 is used to rotate out the adjustment pad mounting face of the low-pressure turbine shaft 10 so that the measurement is accessible.
The top of the lifting screw 530 is welded with 3 wrenching bars for rotating the screw rod, and the lifting of the screw rod can drive the lifting of the low-pressure turbine shaft.
The anti-twist sleeve 500 is preferably in a fan-shaped cylinder structure and is fixed on the fixing bracket 121, and splines are arranged in the anti-twist sleeve 500 and are matched with the splines at the front end of the low-pressure turbine shaft 10, so that the rotor is prevented from rotating in the force limiting process.
In addition, the upper frame 110 further includes at least two fixing seats 600, and the fixing seats 600 are fixed to an outer side portion of the upper end surface of the supporting frame 111, for example, by screws. The fixing seats 600 are preferably arranged in a 180-degree symmetrical manner, and the limiting plate 300 is fixed between the two corresponding fixing seats 600 and supported by the fixing seats 600.
Preferably, the tightening wrench 200 includes a wrench head 210, a plurality of lifting rods 220, and a torque multiplier 230 for limiting the force of a five-pivot internal and external compression nut. The lifting bar 220 is installed on the wrench head 210, and the torque amplifier 230 is installed between the lifting bars 220.
The stopper 310 is disposed on the stopper plate 300, and the stopper 310 is mounted on the fixed wrench for limiting the handle 231 of the torque amplifier 230. Bolts 320 are provided at both ends of the limiting plate 300 for connecting the limiting plate 300 and the holder 600.
As described above, the mounting platform 100 can hold and lift and lower the low-pressure turbine shaft 10, and support the rotor and the stator on the mounting platform axially by the height difference H2 shown in fig. 1. A bearing compression nut screwing wrench and a torque multiplier can be fixed on the assembly platform 100 to finish screwing and force limiting of a bearing inner ring compression nut, a reverse-torsion sleeve 500 can be installed at the front end of the assembly platform 100, the reverse-torsion sleeve 500 is provided in the force limiting process, and the scale 400 is fixed on the assembly platform. The upper frame 110 is used for supporting the rotor and the stator according to the height difference H2, so as to rotate the rotor and fix the scale 400.
In addition, the assembly platform 100 further adopts a lifting appliance 700, which is connected with the rear flange edge of the turbine rear casing through a flange, and the center of the lifting appliance 700 is provided with a guide hole, and the guide hole is in small clearance fit with the guide shaft 800. The guide shaft 800 has a cylindrical structure, and the front end thereof is screwed into a threaded hole formed in the rear end of the rotor-stator support cone wall.
The invention also discloses a vertical low-pressure turbine unit body assembling method, which adopts the vertical low-pressure turbine unit body assembling device and comprises the following steps:
step S1And mounting the low-pressure turbine shaft on the assembling platform, and adjusting the position of the low-pressure turbine shaft.
Wherein, the step S1Further comprising the steps of:
step S11Fixing the measuring plate on the mounting surface of the adjusting pad of the low-pressure turbine shaft through a compression nut, and checking the measuring plate and the adjusting pad of the low-pressure turbine shaft through a feeler gaugeWhether the mounting surface is attached or not;
step S12Mounting the low-pressure turbine shaft on an assembly platform and clamping the low-pressure turbine shaft through an upper clamping ring and a lower clamping ring;
step S13Lowering the low-pressure turbine shaft to the lowest position by adjusting the lifting screw rod;
step S14And heating the rear connecting flange of the low-pressure turbine shaft to 150 ℃ by a heating gun.
S2And mounting the low-pressure turbine rotor stator on an assembly platform, and adjusting the positions of the low-pressure turbine shaft and the low-pressure turbine rotor stator so that the low-pressure turbine shaft and the low-pressure turbine rotor stator are in butt joint.
Wherein, the step S2Further comprising the steps of:
S21placing the low-pressure turbine rotor stator on an assembly platform;
S22lifting the low-pressure turbine shaft by adjusting the lifting screw rod, so that a rear connecting flange of the low-pressure turbine shaft is attached to a connecting flange of a support conical wall of a low-pressure turbine shaft rotor;
S23tightening connecting nuts of the low-pressure turbine shaft and the low-pressure turbine rotor and stator in a circumferentially uniform distribution manner;
S24loosening the upper clamping ring and the lower clamping ring;
S25placing dial indicators at the last-stage disk center of the low-pressure turbine rotor stator and the front matching cylindrical surface of the low-pressure turbine shaft;
S3rotating the low-pressure turbine rotor, and detecting whether the runout value of the turbine disk center and the front fit cylindrical surface of the low-pressure turbine shaft conforms to a design value through a dial indicator; if not, separating the rotor and the stator of the low-pressure turbine from the low-pressure turbine shaft, adjusting and then butting again; and installing the low-pressure turbine shaft and other connecting nuts of the low-pressure turbine rotor stator until the design value is met.
S4And mounting and fixing the low-pressure turbine shaft and the low-pressure turbine rotor and stator.
Wherein, the step S4Further comprising the steps of:
S41installing five-fulcrum bearing and other parts of the axle center;
S42installing the internal and external compression nuts of the five-fulcrum bearing;
S43installing a back-twist sleeve to limit the rotation of the low-pressure turbine rotor;
S44mounting the limiting plate on the assembling platform;
S45installing a tightening wrench, and limiting the force of the internal and external compression nuts of the five-fulcrum bearing by tightening the wrench to make the internal and external compression nuts meet the design value;
S46after the force limit is qualified, the spanner is screwed down;
S47separating out the limiting plate;
S48and screwing the guide shaft into the threaded hole at the rear end of the rotor-stator support conical wall.
S5And mounting the turbine rear casing on a rear flange of the low-pressure turbine rotor and stator through a lifting appliance.
S6And measuring the axial distance between the ball head part of the ruler and the measuring plate through the standard measuring block, wherein the axial distance is H.
S7And H2 is calculated as H axis- (H mark + H measurement), the value of the H axis can be measured through three coordinates, and the value of the H mark is the factory metering value of the assembly platform.
According to the description, the vertical low-pressure turbine unit body assembling device adopts the multifunctional low-pressure turbine assembling platform to realize the assembling of the low-pressure turbine unit body, the assembling platform can realize the clamping, lifting and descending of the low-pressure turbine shaft, the rotor and the stator can be simultaneously supported according to the height difference H2 shown in figure 1 and can axially rotate on the assembling platform, and the bearing compression nut screwing wrench and the torque multiplier can be fixed on the assembling platform, so that the screwing and force limiting of the bearing inner ring compression nut are completed.
The measurement of the axial dimension H1 of the low-pressure turbine stator is completed by combining the fixed scale with the standard gauge block. Accurate centering installation of the turbine rear casing under the blind installation condition is realized through the precise centering guide rod, and collision of the inner ring and the outer ring of the bearing is avoided.
In addition, support bosses are arranged at a plurality of positions on the low-pressure turbine assembly platform, a universal magnetic force gauge stand can be fixed to clamp a dial gauge to measure the jumping values of a plurality of annular elements on the low-pressure turbine shaft, the rotor, the stator and the turbine rear casing, and the assembly quality of the low-pressure turbine unit body is evaluated through the jumping values.
The bottom of the assembling platform is provided with a back-twisting sleeve which is matched with a front spline of the low-pressure turbine shaft and provides back-twisting for screwing the bearing gland nut, the support conical wall and the turbine shaft connecting nut.
In the assembling process, the low-pressure turbine shaft is pre-installed on the assembling platform, and the vertical lifting of the low-pressure turbine shaft is controlled through the lifting screw at the bottom of the platform, so that the butt joint of the turbine shaft and the rotor and the stator is realized. The middle part of the platform is provided with a double-section clamping snap ring for clamping the low-pressure turbine shaft and ensuring that the axis of the low-pressure turbine shaft is axially aligned with the platform.
In addition, considering the expansibility of the models, the assembly platform is structurally designed, all functional parts can be replaced, and the assembly of low-pressure turbine units of different models and sizes can be met.
The method for assembling the vertical low-pressure turbine unit body establishes the low-pressure turbine unit body assembly reference according to the inner cylindrical surface A and the front end surface B of the primary turbine disc, and controls the axial distance between the rotor and the stator according to the drawing requirements. And detecting the rotor disk center runout, the cylindrical surface runout of the bearing inner ring installation, the stator casing runout and the cylindrical surface runout of the turbine rear casing bearing outer ring installation according to the assembly standard. In the process of detecting the turbine runner through the hole detector, the rotor can rotate.
The assembling method overcomes the interference fit between the low-pressure turbine shaft and the supporting conical wall in the rotor and the stator, and quickly realizes the butt joint and the tightening of the low-pressure turbine shaft and the supporting conical wall. Whether the low-pressure turbine shaft is installed in a centering mode is detected, and tightening and force limiting of the bearing inner ring compression nut can be achieved. Accurate centering installation of the turbine rear casing is achieved under the blind installation condition, and mutual collision of the inner ring and the outer ring of the bearing is avoided under the invisible state. After the low pressure turbine unit body is assembled, the measurement of the rotor and stator axial distance H1 is measured.
In summary, the assembling method and the assembling apparatus of the vertical low pressure turbine unit of the present invention have the following advantages:
the method adopts a vertical assembly method, has simple principle, is easy to center, and meets the requirement of assembling the low-pressure turbine unit body according to the drawing;
secondly, the assembling operation process is simple and stable, the repeatability is good, and the assembling quality of the low-pressure turbine is stable;
thirdly, the assembly efficiency is high, and the assembly cost is low;
and fourthly, the expansibility of the platform is strong, and the assembly of low-pressure turbine unit bodies of different models and different sizes can be met by replacing functional parts.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (12)
1. The utility model provides a vertical type low pressure turbine unit body assembly quality, its characterized in that, vertical type low pressure turbine unit body assembly quality includes: the assembly platform comprises an upper frame and a lower frame, and the upper frame and the lower frame are fixedly connected up and down to form a hollow frame structure;
the limiting plate is arranged above the upper frame, and the tightening wrench is arranged on the lower end surface of the limiting plate; the compression measuring device is arranged on the inner bottom surface of the lower frame and is positioned right below the upper frame, one end of the scale is arranged on the upper frame, and the other end of the scale extends downwards;
a low-pressure turbine shaft is vertically fixed through the compression measuring device and the tightening wrench, a low-pressure turbine rotor and a low-pressure turbine stator are fixed on the upper frame, and the upper end of the scale is fixed on the upper frame and vertically extends downwards;
the upper frame comprises a supporting frame, a centering ring, an upper clamping ring and a lower clamping ring, and the supporting frame is a hollow annular frame with an upper layer and a lower layer;
the center of the hollow annular frame extends downwards to form a hollow cylinder, and the upper clamping ring and the lower clamping ring are respectively installed at the upper end part and the lower end part of the hollow cylinder and used for clamping the low-pressure turbine shaft so that the low-pressure turbine shaft is positioned on the axis of the assembling platform;
the centering ring is fixed at the central position of the upper end face of the supporting frame and surrounds the upper end part of the hollow column body.
2. The vertical low pressure turbine unit block assembly device of claim 1, wherein the upper frame further comprises a stator retainer ring, a lower bearing seat, rolling bearing elements, and an upper bearing seat, the stator retainer ring being secured to the support frame for securing a front mounting flange of a turbine case;
the bearing upper seat and the bearing lower seat are vertically overlapped and fixed on the outer side part of the centering ring, and the bearing rolling body is arranged between the bearing upper seat and the bearing lower seat.
3. The vertical low pressure turbine unit assembly device of claim 1, wherein the lower frame has a fixing bracket mounted on the upper end surface of the bottom thereof, the fixing bracket being located directly below the lower clamping ring;
the compression measuring device comprises a reverse-twisting sleeve, a measuring plate, a compression nut and a lifting screw rod, wherein the lifting screw rod is fixed at the central position of the fixing bracket, the compression nut is installed on the lifting screw rod, the measuring plate is installed on the compression nut, and the reverse-twisting sleeve is sleeved on the periphery of the measuring plate, the compression nut and the lifting screw rod and fixed on the fixing bracket.
4. The vertical low pressure turbine unit assembly of claim 3 wherein the anti-torque sleeve is a fan-shaped barrel structure secured to the mounting bracket, and wherein splines are provided in the anti-torque sleeve for mating with splines on the forward end of the low pressure turbine shaft.
5. The vertical low pressure turbine unit body assembly device of claim 1, wherein the upper frame further comprises at least two fixing seats, the fixing seats are fixed on the outer side of the upper end surface of the supporting frame, the fixing seats are arranged 180 ° symmetrically in pairs, and the limiting plates are fixed between the two corresponding fixing seats.
6. The vertical low pressure turbine unit body assembly device of claim 1, wherein the tightening wrench comprises a wrench head, a plurality of lifters mounted on the wrench head, and a torque multiplier mounted between the lifters.
7. The vertical low pressure turbine unit body assembly device of claim 6, wherein the position limiting plate is provided with a stopper, and the stopper is mounted on a fixed wrench for limiting a handle of the torque amplifier.
8. The vertical low pressure turbine unit assembly of claim 1, wherein the scale is provided with a ball at its end.
9. A vertical low pressure turbine unit assembling method, wherein the assembling method uses the vertical low pressure turbine unit assembling apparatus of claim 3 or 4, comprising the steps of:
S1mounting the low-pressure turbine shaft on the assembly platform, and adjusting the position of the low-pressure turbine shaft;
S2mounting the low-pressure turbine rotor stator on an assembly platform, and adjusting the positions of the low-pressure turbine shaft and the low-pressure turbine rotor stator so that the low-pressure turbine shaft and the low-pressure turbine rotor stator are in butt joint;
S3rotating the low-pressure turbine rotor, and detecting whether the runout value of the turbine disk center and the front fit cylindrical surface of the low-pressure turbine shaft conforms to a design value through a dial indicator; if not, separating the rotor and the stator of the low-pressure turbine from the low-pressure turbine shaft, adjusting and then butting again; installing the low-pressure turbine shaft and other connecting nuts of the low-pressure turbine rotor stator until the design value is met;
S4the low-pressure turbine shaft and the low-pressure turbine rotor and stator are fixedly installed;
S5mounting a turbine rear casing on a rear flange of the low-pressure turbine rotor and stator through a lifting appliance;
S6measuring the axial distance between the ball head part of the scale and the measuring plate through the standard measuring block, wherein the axial distance is H measurement; the ball head part is arranged at the tail end of the scale;
S7and H2 is calculated as H axis- (H mark + H measurement), the value of the H axis can be measured through three coordinates, and the value of the H mark is the factory metering value of the assembly platform.
10. The vertical low pressure turbine unit assembly method of claim 9, wherein the step S1Further comprising the steps of:
S11fixing the measuring plate on the mounting surface of the adjusting pad of the low-pressure turbine shaft through a compression nut, and checking whether the measuring plate is attached to the mounting surface of the adjusting pad of the low-pressure turbine shaft through a feeler gauge;
S12mounting the low-pressure turbine shaft on an assembly platform and clamping the low-pressure turbine shaft through an upper clamping ring and a lower clamping ring;
S13lowering the low-pressure turbine shaft to the lowest position by adjusting the lifting screw rod;
S14and heating the rear connecting flange of the low-pressure turbine shaft to 150 ℃ by a heating gun.
11. The vertical low pressure turbine unit assembly method of claim 10, wherein the step S2Bag for returningThe method comprises the following steps:
S21placing the low-pressure turbine rotor stator on an assembly platform;
S22lifting the low-pressure turbine shaft by adjusting the lifting screw rod, so that a rear connecting flange of the low-pressure turbine shaft is attached to a connecting flange of a support conical wall of a low-pressure turbine shaft rotor;
S23tightening connecting nuts of the low-pressure turbine shaft and the low-pressure turbine rotor and stator in a circumferentially uniform distribution manner;
S24loosening the upper clamping ring and the lower clamping ring;
S25and dial indicators are arranged on the disk center of the last stage of the low-pressure turbine rotor stator and the front matching cylindrical surface of the low-pressure turbine shaft.
12. The vertical low pressure turbine unit assembly method of claim 10, wherein the step S4Further comprising the steps of:
S41installing five-fulcrum bearing and other parts of the axle center;
S42installing the internal and external compression nuts of the five-fulcrum bearing;
S43installing a back-twist sleeve to limit the rotation of the low-pressure turbine rotor;
S44mounting the limiting plate on the assembling platform;
S45installing a tightening wrench, and limiting the force of the internal and external compression nuts of the five-fulcrum bearing by tightening the wrench to make the internal and external compression nuts meet the design value;
S46after the force limit is qualified, removing the tightening wrench;
S47removing the limiting plate;
S48and screwing the guide shaft into the threaded hole at the rear end of the rotor-stator support conical wall.
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| CN201910613809.4A CN112207760B (en) | 2019-07-09 | 2019-07-09 | Vertical low-pressure turbine unit assembling device and assembling method thereof |
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| CN201910613809.4A CN112207760B (en) | 2019-07-09 | 2019-07-09 | Vertical low-pressure turbine unit assembling device and assembling method thereof |
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| 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 |
| CN115229460B (en) * | 2022-06-20 | 2023-10-10 | 满洲里达赉湖热电有限公司 | Vertical assembly quality of water pump |
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| US7765658B2 (en) * | 2005-10-17 | 2010-08-03 | Pratt & Whitney Canada Corp. | Blade tip grinding tooling |
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