CN104467305A - 1000 MW electric generator stator transport interface part assembling method - Google Patents

Abstract

The invention aims at providing a 1000 MW electric generator stator transport interface part assembling method which is applied to preparation work before 1000 MW electric generator stator transport. By means of the method, the problems and potential unsafe hazards of an existing installation method are eliminated, the accuracy of the assembling relationship and assembling size is ensured, the relationship of an electric generator stator and a vehicle is correct, the structure combination deformation meets the expected requirements, the influences of abnormal gaps on stress distribution changes are eliminated, the correct assembling relationship between a connecting rod and a spherical washer set is ensured, the abnormal initial stress of root parts of ear plates is eliminated, and it is ensured that the correct initial stress of the connecting rod is obtained. Due to the application of a measurement bracket, the bending sink amount and changes of a machine base of the electric generator stator are accurately monitored, the real-time data for ensuring the transport safety are obtained, and guarantees are provided for subsequent correct vehicle combination, safe transport and transport monitoring.

Description

1000MW generator unit stator transport interface unit assembly method

Technical field: the present invention relates to a kind of 1000MW generator unit stator transport interface unit assembly method.

Background technology: 1000MW level ultra supercritical steam turbine generating set has that efficiency of fire coal is high, the advantage of clean environment firendly, meet the requirement of national energy development policies, generating set single-machine capacity increases and becomes development trend, generator designs problems faced is that the size of its stator and weight exceed transportation limitation, becomes bottlenecks problem in the transport in inland.

Solving heavy-duty generator stator transportation problem can adopt inside and outside support to design, in electricity generator stator stand is designed to, outer two parts, the work such as the plug-in mounting of inside and outside support are carried out in building site, the dimension and weight of internal stator is all little compared with the one-piece stator of same capacity, reduce transport difficulty, though internal stator has the advantage being convenient to transport compared with one-piece stator, but need special process equip and build interim factory building in subsequent field construction, assembly precision under simple and crude technological equipment condition controls, the protection of insulation system, tissue and the construction period of construction control, on-site construction time comparatively one-piece stator such as obviously to extend at the series of problems, manufactory and user must work hard to this and give way.

The comprehensive considerations such as collateral security generator performance and construction period, stator whole Transporting is adopted to be still optimal selection, insulation property are the key issues affecting generator reliability, in manufactory, complete the whole assembling process of stator can better ensure generator performance, also the protected working in transport and storage process is facilitated, product quality can be ensured to greatest extent and shorten the site operation cycle, fully meeting family interests demand, manufactory is also conducive to reducing production cost and cost of transportation; But whole Transporting is subject to the constrained of railroad bridge, vehicle bearing capacity and track clearance, must considers at the design initial stage and address these limitations factor.

At Railway Transport Industry, this kind of large cargo transport of large turbo-type generator stator belongs to large and lengthy cargo transport, haulage vehicle version has stronger specific aim, can suitable special vehicle transport the prerequisite implemented, and these vehicles also developed for demand, stator of steam turbine generator section is large, and self stiffness is high, is applicable to adopting schnabel car transport.

The overall railway transportation scheme of 1000MW generator unit stator adopts the transport interface unit of transport form of flanges, for transport flange exist otic placode Root Stress concentration problem and out frame significantly loss of weight cause stiffness to reduce problem, adopt carrying top blind flange and bottom prestressing force direct connection coupling bar structure, transport interface unit is the critical component of schnabel car transport 1000MW generator unit stator, be related to the integrality of vehicle, be responsible for the transmission of static(al) and transport shocks power, the huge concentrfated load applied by clamp beam pin-and-hole and compression leg will be delivered to the positions such as support crust by transport interface unit, transport flange and stator are connected to become entirety by connecting bolt, connecting bolt not only provides composition surface pressure at this, and bear pulling force, it is the connection medium of transport flange and stator, Transport Safety is counted for much, stressing conditions is special, gives tight power numerical value and is different from usual way, to provide enough, tight power self is had enough coefficient of safetys.

Traffic program adopts direct connection coupling bar to connect vapour and encourages two ends transport flange, Shi Hanzhang before entrucking, directly contact with extended structure bottom otic placode by beating hair style concave spherical surface connection pole socket, form the hinged force transferring structure of mother metal, avoid Welding Structure to bear heavily stressed, concave spherical surface connects pole socket and convex spherical packing ring forms Self-aligning structure, makes direct connection coupling bar stress can be reduced to two power bars, avoid bearing moment of flexure additional stress, improve working strength.Above-mentioned way effectively can reduce the heavily stressed and connecting bolt stress of transport flange and support dangerous position, be conducive to ensureing transportation safety, part pulling force is directly transmitted by direct connection coupling bar, reduces stator and transports the stressed of flange bolt, ensureing Bonding pressure and globality.The elongation eleasticity factor of direct connection coupling bar is far below integrally-built elongation eleasticity factor, dynamic and static load can be made to be born respectively by different structure, direct connection coupling bar affects little by dynamic loading, higher pulling force can be applied, the static(al) that transport flange bolt is born reduces, dynamic loading ability to take the burden improves, very favourable to guarantee transportation safety.

Adopt direct connection coupling bar not only can reduce transport flange, the stress of support and connecting bolt stress, ensure transportation safety, but also the moment of flexure that support produces by the clamping force of schnabel car can be reduced, reduce flexural deformation degree, avoid producing hazard factor to generator stator core suspended structure etc., the prestressing force of conservative control direct connection coupling bar can make deflection deformation extent control within the scope of acceptable.

Because the overall railway transportation scenario-frame of 1000MW generator unit stator is complicated, relate to the structures such as transport flange, connecting bolt, direct connection coupling bar, above-mentioned parts and generator unit stator become vehicle rail structure after conjunction car, are related to Exploration on Train Operation Safety; After entrucking, textural association distortion causes stress distribution situation of change complicated, as load step and the unreasonable part-structure local stress that very easily causes of prestressing force parameter exceed permissible value, harm transportation safety even causes serious driving accident, so the preparation before entrucking, comprise the connecting installation step and must strictly control of transport interface unit and generator unit stator of transport flange, connecting bolt, direct connection coupling bar, otherwise stator cannot be reached connect parameter and correct construction pre-stress parameter with the correct of vehicle; And due to the restriction of structure, size, weight, assembly relation, 1000MW generator unit stator transport interface unit installation step and method have strict requirement.

The real-time monitoring project that generator unit stator transport interface unit installation step before in the past transporting entrucking and method are formulated according to structural design and transport monitoring unit is formulated, there occurs some problems, as paper " before the railway transportation of 1000MW stator of steam turbine generator preparation " (article numbering 1005-006X (2013) 04-0057-02), " DQ in practice ₄₅type clamp type lorry end cap mode transports the experimental study of 1000MW generator unit stator " (article numbering 1001-4632 (2011) 04-0109-08) describe these problems, the subject matter existed is that key position stress monitoring primary stress measured deviation is too high, structure stress distribution departs from desired value, the change of out frame bending subsidence amount is difficult to the problems such as monitoring, load step is caused repeatedly to carry out, labor intensive material resources, affect or delay the arrangement of transport project, and leave over transportation safety hidden danger.

For transporting Problems existing in the past, subsequent transportation has carried out substantial change to the generator unit stator transport interface unit assembly method before transport, propose partial alteration's structure, and change according to partial alteration's structure or newly increased installation step requirement, define the installation step of complete specification, eliminate deficiency and the problem hidden danger of previous methods, form the present invention, ensure the security implementation of 1000MW generator unit stator transport.

Summary of the invention: the object of this invention is to provide a kind of 1000MW generator unit stator transport interface unit assembly method, eliminate weak point and the hidden danger of previous methods existence, make postorder close car step correctly to carry out, reach stator and connect parameter and correct construction pre-stress parameter with the correct of vehicle, ensure the safety of generator unit stator transport.

Technical scheme of the present invention is: assembling process follows these steps to carry out:

Assembling process follows these steps to carry out:

Step one: assembling cover plate (1) step: cover plate (1) is tentatively in place, make cover forward end (2) evenly outstanding end face of machine base (3) 0.3mm-0.5mm, with bolt (4), cover plate is fixed on out frame conjunction, 4, interval screw a tight bolt (4), bolt (4) tight moment between 400N.m-500N.m, welding block (5), after weld seam cool to room temperature, check the gap (33) between block and cover plate, if gap (33) are greater than 0.01mm, join pad (6), unscrew bolt (4), jacking force is applied in cover forward end (2), and inspection cover front edge of board (2), require that the numerical value of outstanding end face of machine base (3) is at 0.1mm-0.5mm, and two side errors are less than 0.1mm, if exceed above-mentioned scope, then revised by adjustment pad (6), until meet the demands, by 500N.m tight moment tight all bolts (4), finally press between 2000N.m-2500N.m tight moment tight all bolts (4),

Step 2: assembling transport flange (7) step: adjustment transport flange (7), make the vertical center line (8) of transport flange (7) and end face of machine base (3) and cross central line (9) close to overlapping, deviation is less than 1mm each other, measure the seam gap (10) on vertical stiffeners (34) top, join pad (11), with the masterpiece of often upwards 600kN for transporting the connection pole socket bottom surface (12) of flange, pad is made to be clamped (11), again check transport flange (7) and the vertical center line (8) of end face of machine base (3) and the departure of cross central line (9), otherwise adjustment pad (11) thickness and quantity, until meet deviation to be each other less than 1mm,

Step 3: transport flange bolt (13) pretension step: first with between 600N.m-800N.m, tight moment pretension all being transported flange bolt (13), be finally 3300N.m-3500N.m tight moment, tight order be: the transport flange bolt (13) being first transport flange bottom (14), tight to both sides handle successively from middle part, then be the transport flange bolt (13) of transport flange top (15), tight to both sides handle successively from middle part, it is finally the transport flange bolt (13) of the left and right sides (35), answer the left and right sides corresponding to tight,

Step 4: assembling coupling bar (16) step: the screw thread of coupling bar (16) and long joining section (17) must be cleaned out and be coated with lubricating oil, every two coupling bars (16) are combined into a coupling bar group (18) with a long joining section (17), hold up with three typed moving lifting platforms (28), insert the coupling bar bore (19) of transport flange (7); Adjustment lateral attitude and height, the axle center of coupling bar group (18) is overlapped with the axle center of the coupling bar bore of transport flange is close, adjustment lengthwise position, the connection pole socket end face (20) making coupling bar group (18) vapour end termination (19) stretch steam output end transport flange is 530mm, and coupling bar group (18) is encouraged and hold termination (21) to stretch out to be encouraged the connection pole socket end face (22) holding transport flange is 480mm; Directing pin (23) is installed, relies on location and the support assemblies concave spherical surface seat (24) of directing pin (23); Clean out the cooperation sphere of concave spherical surface seat (24) and convex spherical seat (25), and be coated with lubricating oil, assembling convex spherical seat (25); Clean out the thread surface of end nut (26) and coupling bar (16), and be coated with lubricating oil, screw end nut (26) with spanner;

Step 5: the preliminary pretension step of coupling bar group (18): use hydraulic elongator (27) to follow these steps to carry out pretension, first with pulling force stretching coupling bar group (18) of 20t and locking end head nut (26), reduce the height of typed moving lifting platform (28), coupling bar group (18) is separated with typed moving lifting platform (28); Coupling bar group (18) is progressively strained and locking end head nut (26) with the increment increasing 20t pulling force at every turn, the pulling force of final locking end head nut (26) is 260t, cinching process then should make the alternately tension of two groups of coupling bar groups (18) as used a set of hydraulic elongator (27), as used two cover hydraulic elongators (27) that two groups of coupling bar groups (18) then should be made to strain simultaneously, and keep the pulling force of two groups of coupling bar groups (18) substantially identical;

Step 6: coupling bar group (18) normotopia step: use hydraulic elongator (27) to follow these steps to carry out, the height of lifting mobile self-powered platform (28), makes coupling bar group (18) and typed moving lifting platform (28) reliable contacts; Coupling bar group (18) is progressively loosened with the pulling force decrement reducing 20t at every turn, finally loosen end nut (26) completely, this process is loosened as used a set of hydraulic elongator (27) that two groups of coupling bar groups (18) then should be made to hocket, as used two cover hydraulic elongators (27) that two groups of coupling bar groups (18) then should be made to loosen simultaneously, and keep the pulling force of two groups of coupling bar groups (18) substantially identical;

Step 7: the formal pretension step of coupling bar group (18): keep coupling bar group (18) and typed moving lifting platform (28) reliable contacts; Hydraulic elongator (27) is used to follow these steps to carry out pretension, coupling bar group (18) is progressively strained and locking end head nut (26) with the increment increasing 20t pulling force at every turn, the pulling force of final locking end head nut (26) is 260t, cinching process then should make two groups of coupling bar groups (18) hocket as used a set of hydraulic elongator (27), two groups of coupling bar groups (18) then should be made simultaneously to carry out as used two cover hydraulic elongators (27) and keep the pulling force of two groups of coupling bar groups (18) substantially identical;

Step 8: support (29) bending subsidence quantitative determination preparation process: remove typed moving lifting platform (28), lifting supporting plate (30) is installed, amesdial (31) is arranged in lifting supporting plate (30), amesdial contact (32) is made to contact the lower surface of long joining section (17), by amesdial (31) reading playback zeroing.

Technique effect: innovative point of the present invention is to eliminate previous methods Problems existing and hidden danger, solve following key issue: be first ensure that assembly relation and fitted position accurate, make generator unit stator and vehicle relativeness correct, textural association is out of shape and reaches expection requirement, eliminate the impact of the stress distribution change that the slippage changing of the relative positions that fit-up gap causes brings; Coupling bar installation step ensure that the correct assembly relation of coupling bar and spheric washer group, eliminates the acquisition of the abnormal primary stress of otic placode root and the correct primary stress of coupling bar; The utilization accurate measurements measuring bracket is to the support bending subsidence amount of generator unit stator and change and obtain the real time data of guarantee transportation safety;

Due to the enforcement of step one, cover plate is correctly assembled with generator unit stator, eliminate fit-up gap, form continuous print upper pressure bang path, the compression leg top power after closing car is avoided to cause the slippage changing of the relative positions, guarantee Stability Analysis of Structures is constant, and the compression leg top power up to upper kiloton is transmitted by cover plate, avoid support bore heavily stressed, ensure stand structure safety and transportation safety;

The enforcement of step 2 ensure that the correct assembling of transport flange, is first that transport flange is overlapped with the center line of stator, and this is the guarantee that the conjunction car of postorder correctly carries out, and the center line of stator is overlapped with the center line of vehicle, avoids entire vehicle centre-of gravity shift, this step also ensure that the relative position between transport flange and generator unit stator is accurately constant, adjustment pad eliminates the gap between transport flange and generator unit stator between seam, eliminate the hidden danger of transport flange and the generator unit stator relative position slippage changing of the relative positions, transportation impulsive force is avoided to cause bearing structure structural relation and distribution of force change, ensure that the accurate of assembly relation and fitted position, make generator unit stator and vehicle relativeness correct, textural association is out of shape and reaches expection requirement, eliminate the impact of the stress distribution change that the slippage changing of the relative positions that fit-up gap causes brings, ensure traffic safety,

The enforcement of step 3 ensure that by the tight bolt strained equilibrium of whole transport flanges, avoids because transport flange too much changes the stressed generation of tight bolt and causes tight power is not enough or the too high dangerous hidden danger caused the distortion in conjunction process is caused;

The enforcement of step 4 ensures that the operation of disassembling coupling bar after transport terminates is easy, avoids screw thread to grind wound and causes dismounting difficulty, propose feasible operation scheme and requirement, and be that subsequent operation is ready;

The cooperation of step 5, step 6, step 7 makes coupling bar group correctly strain, ensure that the correct assembly relation of coupling bar group and spheric washer group, clamping stagnation is avoided to cause transport flange local stress abnormal, eliminate the abnormal primary stress of otic placode root, ensure that the acquisition of the correct primary stress of coupling bar;

Step 5 is the preliminary pretension step of coupling bar group, this step makes coupling bar group reach tensioned state, this state is basic close to final rigging position state, but there is coupling bar group malposition, natural torsion deflection due to during this step initial pullup, coupling bar primary stress can be caused to reform error, spheric washer group also can produce frictional resistance in slipping of reforming, and causes stress distribution anomaly, so adopt following steps to eliminate above-mentioned impact;

Step 6 utilizes typed moving lifting platform to hold up coupling bar group, the coupling bar group after release pulling force is made still to keep final rigging position state, now coupling bar group and transport flange are all in close to final rigging position state and there are not other additional stresses, the initial calibration that now can carry out the transport monitoring element of coupling bar group and transport flange is answered, for follow-up monitoring provides correct primary data;

Step 7 step 6 provide close to final rigging position state under just straining coupling bar group, because in cinching process, the bending subsidence amount of coupling bar group does not change substantially, spheric washer group does not exist in sliding friction drag of reforming yet, disturbing factor is controlled in acceptable degree, ensure that the correctness of assembly structure;

In step 5, step 6, step 7 operating process, the regulation restriction of hydraulic elongator operation be ensure that influencing each other of two groups of coupling bar groups is minimum, make the distortion of overall structure under coupling bar group pulled out condition symmetrical, avoid structure stress distribution abnormal;

Step 8 is support bending subsidence quantitative determination preparation process, remove typed moving lifting platform, install and measure supporting plate, amesdial is arranged on lifting supporting plate, make the lower surface of amesdial contact long joining section, by amesdial reading playback zeroing, now be supported on lower margin position because generator unit stator supports square chest by 4, generator unit stator is not now subject to the moment of flexure because the clamping force of schnabel car causes, namely the support bending subsidence amount of generator unit stator is zero, and amesdial reading is also adjusted to zero;

Follow-up work beyond step of the present invention, namely close and accurately will to measure the moment of flexure that clamping force that generator unit stator is subject to schnabel car causes and the support bending subsidence amount produced after car, previous methods does not solve this measurement problem, or measure error is excessive, as adopt other object of reference measurement of comparison the measure error brought be difficult to meet testing requirement, and in transport traveling process, also cannot monitor the change of this support bending subsidence amount, the problems referred to above cause and cannot accurately monitor the stressed of stator and deformation state, bring hidden danger to transport;

Owing to present invention employs, amesdial is arranged on measurement supporting plate, and measure supporting plate and be arranged on generator unit stator centre, this position is generator unit stator bending subsidence and is out of shape maximum position, bending subsidence distortion is produced under the Moment that generator unit stator causes in the clamping force of schnabel car, downward deformation displacement can be produced relative to two ends in the middle part of generator unit stator, coupling bar group two ends are fixed on the connection pole socket of transport flange, due to the effect of pretightning force, coupling bar group is in tensioned state always, the distortion although generator unit stator bends, but the tensioned state of coupling bar group does not change, the upright position of coupling bar group is consistent with the upright position at generator unit stator two ends, the upright position of transport flange-namely all the time, and the bending subsidence distortion that generator unit stator followed by the amesdial be arranged on measurement supporting plate moves down, so the reading of amesdial is generator unit stator close the bending subsidence deflection after car, if substitute amesdial with position measurement sensor in transportation, then can monitor the situation of change of electricity generator stator stand bending subsidence amount in real time, provide key message to transportation safety condition monitoring,

The utilization of coupling bar installation step measurement bracket makes the conjunction car support bending subsidence amount of accurate measurements generator unit stator and transportation monitor the change of electricity generator stator stand bending subsidence amount in real time and provides possibility, to ensureing that transportation safety provides great help.

Accompanying drawing illustrates:

Fig. 1 is that the present invention assembles cover plate step schematic diagram.

Fig. 2 is that the present invention assembles transport flange step schematic diagram.

Fig. 3 is step 3 schematic diagram.

Fig. 4 is coupling bar connection diagram.

Fig. 5 is coupling bar group schematic diagram in place.

Fig. 6 is nut assembling schematic diagram.

Fig. 7 is the preliminary pretension schematic diagram of coupling bar group

Fig. 8 is support bending subsidence quantitative determination preparation process schematic diagram

Embodiment: a kind of 1000MW generator unit stator transport interface unit assembly method, assembling process follows these steps to carry out:

Step one: as shown in Figure 1, assembling cover plate 1 step, cover plate 1 is tentatively in place, make cover forward end 2 evenly outstanding end face of machine base 3 numerical value 0.3-0.5mm, with bolt 4, cover plate is fixed on out frame conjunction, 4, interval screw a bolt 4, bolt 4 tight moment between 400N.m-500N.m; Welding block 5, after weld seam cool to room temperature, check gap 33 between block and cover plate, if gap 33 is greater than 0.01mm, join pad 6, unscrew bolt 4, jacking force is applied in cover forward end 2, and inspection cover front edge of board 2, require that the numerical value of outstanding end face of machine base 3 is at 0.1-0.5mm, and two side errors are less than 0.1mm, if exceed above-mentioned scope, then revised, until meet the demands by adjustment pad 6, by 500N.m tight moment tight all bolts 4, finally press between 2000N.m-2500N.m tight moment tight whole bolt 4;

Step 2: assembling transport flange 7 step, as shown in Figure 2, adjustment transport flange, make the vertical center line 8 of transport flange 7 and end face of machine base 3 and cross central line 9 close to overlapping, deviation is less than 1mm each other, measure the seam gap 10 on vertical stiffeners 34 top, join pad 11, with the masterpiece of often upwards 600kN for transporting the connection pole socket bottom surface 12 of flange, pad is made to be clamped 11, again check transport flange 7 and the vertical center line 8 of end face of machine base 3 and the departure of cross central line 9, otherwise adjustment pad 11 thickness and quantity, until meet deviation to be each other less than 1mm.

Step 3: transport flange bolt 13 pretension step, as shown in Figure 3, first with between 600N.m-800N.m, tight moment pretension all being transported flange bolt 13, be finally 3300N.m-3500N.m tight moment, tight order be: the transport flange bolt 13 being first transport flange bottom 14, tight to both sides handle successively from middle part, then be the transport flange bolt 13 on transport flange top 15, tight to both sides handle successively from middle part, be finally the transport flange bolt 13 of the left and right sides 35, answer the left and right sides corresponding to tight;

Step 4: assembling coupling bar 16 step, as shown in Figure 4, the screw thread of coupling bar 16 and long joining section 17 must be cleaned out and be coated with lubricating oil, every two coupling bars 16 long joining section 17 is combined into a coupling bar group 18, as shown in Figure 5, hold up with three typed moving lifting platforms 28, insert the coupling bar bore 19 of transport flange 7; Adjustment lateral attitude and height, the axle center of coupling bar group 18 is overlapped with the axle center of the coupling bar bore of transport flange is close, adjustment lengthwise position, make coupling bar group 18 vapour end termination 19 stretch the connection pole socket end face 20 about 530mm of steam output end transport flange, coupling bar group 18 is encouraged end termination 21 and is stretched out the connection pole socket end face 22 about 480mm encouraging end transport flange; As shown in Figure 6, directing pin 23 is installed, relies on location and the support assemblies concave spherical surface seat 24 of directing pin 23; Clean out the cooperation sphere of concave spherical surface seat 24 and convex spherical seat 25, and be coated with lubricating oil, assembling convex spherical seat 25; Clean out the thread surface of end nut 26 and coupling bar 16, and be coated with lubricating oil, screw end nut 26 with spanner;

Step 5: as shown in Figure 7, the preliminary pretension step of coupling bar group 18, hydraulic elongator 27 is used to follow these steps to carry out pretension, first with the pulling force stretching coupling bar group 18 of 20t also locking end head nut 26, reduce the height of typed moving lifting platform 28, coupling bar group 18 is separated with typed moving lifting platform 28; Coupling bar group 18 is progressively strained and locking end head nut 26 with the increment increasing 20t pulling force at every turn, the pulling force of final locking end head nut 26 is 260t, cinching process should make the alternately tension of two groups of coupling bar groups 18 as used a set of hydraulic elongator 27, as used two cover hydraulic elongator 27 that two groups of coupling bar groups 18 should be made to strain simultaneously, and keep the pulling force of two groups of coupling bar groups 18 substantially identical;

Step 6: coupling bar group 18 normotopia step, uses hydraulic elongator 27 to follow these steps to carry out, the height of lifting mobile self-powered platform 28, makes coupling bar group 18 and typed moving lifting platform 28 reliable contacts; Coupling bar group 18 is progressively loosened with the pulling force decrement reducing 20t at every turn, finally loosen end nut 26 completely, this process is loosened as used a set of hydraulic elongator 27 that two groups of coupling bar groups 18 should be made to hocket, as used two cover hydraulic elongator 27 that two groups of coupling bar groups 18 should be made to loosen simultaneously, and keep the pulling force of two groups of coupling bar groups 18 substantially identical;

Step 7: the formal pretension step of coupling bar group 18, the foil gauge reading initial calibration step monitored in real time for coupling bar group stress in transportation is carried out in this case, keeps coupling bar group 18 and typed moving lifting platform 28 reliable contacts; Hydraulic elongator 27 is used to follow these steps to carry out pretension, coupling bar group 18 is progressively strained and locking end head nut 26 with the increment increasing 20t pulling force at every turn, the pulling force of final locking end head nut 26 is 260t, cinching process should make two groups of coupling bar groups 18 hocket as used a set of hydraulic elongator 27, two groups of coupling bar groups 18 should be made simultaneously to carry out as used two cover hydraulic elongator 27 and keep the pulling force of two groups of coupling bar groups 18 substantially identical;

Step 8: support 29 bending subsidence quantitative determination preparation process, as shown in Figure 8, removes typed moving lifting platform 28, lifting supporting plate 30 is installed, amesdial 31 is arranged on lifting supporting plate 30, makes amesdial contact 32 contact the lower surface of long joining section 17, by amesdial 31 reading playback zeroing;

Innovative point of the present invention is to eliminate previous methods Problems existing and hidden danger, solve following key issue: be first ensure that assembly relation and fitted position accurate, make generator unit stator and vehicle relativeness correct, textural association is out of shape and reaches expection requirement, eliminate the impact of the stress distribution change that the slippage changing of the relative positions that fit-up gap causes brings; Coupling bar installation step ensure that the correct assembly relation of coupling bar and spheric washer group, eliminates the acquisition of the abnormal primary stress of otic placode root and the correct primary stress of coupling bar; The utilization accurate measurements measuring bracket is to the support bending subsidence amount of generator unit stator and change and obtain the real time data of guarantee transportation safety.

Claims (1)

1. a 1000MW generator unit stator transport interface unit assembly method, is characterized in that: assembling process follows these steps to carry out:

Step one: assembling cover plate (1) step: cover plate (1) is tentatively in place, make cover forward end (2) evenly outstanding end face of machine base (3) 0.3mm-0.5mm, with bolt (4), cover plate is fixed on out frame conjunction, 4, interval screw a tight bolt (4), bolt (4) tight moment between 400N.m-500N.m, welding block (5), after weld seam cool to room temperature, check the gap (33) between block and cover plate, if gap (33) are greater than 0.01mm, join pad (6), unscrew bolt (4), jacking force is applied in cover forward end (2), and inspection cover front edge of board (2), require that the numerical value of outstanding end face of machine base (3) is at 0.1mm-0.5mm, and two side errors are less than 0.1mm, if exceed above-mentioned scope, then revised by adjustment pad (6), until meet the demands, by 500N.m tight moment tight all bolts (4), finally press between 2000N.m-2500N.m tight moment tight all bolts (4),

Step 2: assembling transport flange (7) step: adjustment transport flange (7), make the vertical center line (8) of transport flange (7) and end face of machine base (3) and cross central line (9) close to overlapping, deviation is less than 1mm each other, measure the seam gap (10) on vertical stiffeners (34) top, join pad (11), with the masterpiece of often upwards 600kN for transporting the connection pole socket bottom surface (12) of flange, pad is made to be clamped (11), again check transport flange (7) and the vertical center line (8) of end face of machine base (3) and the departure of cross central line (9), otherwise adjustment pad (11) thickness and quantity, until meet deviation to be each other less than 1mm,

Step 3: transport flange bolt (13) pretension step: first with between 600N.m-800N.m, tight moment pretension all being transported flange bolt (13), be finally 3300N.m-3500N.m tight moment, tight order be: the transport flange bolt (13) being first transport flange bottom (14), tight to both sides handle successively from middle part, then be the transport flange bolt (13) of transport flange top (15), tight to both sides handle successively from middle part, it is finally the transport flange bolt (13) of the left and right sides (35), answer the left and right sides corresponding to tight,

Step 4: assembling coupling bar (16) step: the screw thread of coupling bar (16) and long joining section (17) must be cleaned out and be coated with lubricating oil, every two coupling bars (16) are combined into a coupling bar group (18) with a long joining section (17), hold up with three typed moving lifting platforms (28), insert the coupling bar bore (19) of transport flange (7); Adjustment lateral attitude and height, the axle center of coupling bar group (18) is overlapped with the axle center of the coupling bar bore of transport flange is close, adjustment lengthwise position, the connection pole socket end face (20) making coupling bar group (18) vapour end termination (19) stretch steam output end transport flange is 530mm, and coupling bar group (18) is encouraged and hold termination (21) to stretch out to be encouraged the connection pole socket end face (22) holding transport flange is 480mm; Directing pin (23) is installed, relies on location and the support assemblies concave spherical surface seat (24) of directing pin (23); Clean out the cooperation sphere of concave spherical surface seat (24) and convex spherical seat (25), and be coated with lubricating oil, assembling convex spherical seat (25); Clean out the thread surface of end nut (26) and coupling bar (16), and be coated with lubricating oil, screw end nut (26) with spanner;

Step 5: the preliminary pretension step of coupling bar group (18): use hydraulic elongator (27) to follow these steps to carry out pretension, first with pulling force stretching coupling bar group (18) of 20t and locking end head nut (26), reduce the height of typed moving lifting platform (28), coupling bar group (18) is separated with typed moving lifting platform (28); Coupling bar group (18) is progressively strained and locking end head nut (26) with the increment increasing 20t pulling force at every turn, the pulling force of final locking end head nut (26) is 260t, cinching process then should make the alternately tension of two groups of coupling bar groups (18) as used a set of hydraulic elongator (27), as used two cover hydraulic elongators (27) that two groups of coupling bar groups (18) then should be made to strain simultaneously, and keep the pulling force of two groups of coupling bar groups (18) substantially identical;

Step 6: coupling bar group (18) normotopia step: use hydraulic elongator (27) to follow these steps to carry out, the height of lifting mobile self-powered platform (28), makes coupling bar group (18) and typed moving lifting platform (28) reliable contacts; Coupling bar group (18) is progressively loosened with the pulling force decrement reducing 20t at every turn, finally loosen end nut (26) completely, this process is loosened as used a set of hydraulic elongator (27) that two groups of coupling bar groups (18) then should be made to hocket, as used two cover hydraulic elongators (27) that two groups of coupling bar groups (18) then should be made to loosen simultaneously, and keep the pulling force of two groups of coupling bar groups (18) substantially identical;

Step 7: the formal pretension step of coupling bar group (18): keep coupling bar group (18) and typed moving lifting platform (28) reliable contacts; Hydraulic elongator (27) is used to follow these steps to carry out pretension, coupling bar group (18) is progressively strained and locking end head nut (26) with the increment increasing 20t pulling force at every turn, the pulling force of final locking end head nut (26) is 260t, cinching process then should make two groups of coupling bar groups (18) hocket as used a set of hydraulic elongator (27), two groups of coupling bar groups (18) then should be made simultaneously to carry out as used two cover hydraulic elongators (27) and keep the pulling force of two groups of coupling bar groups (18) substantially identical;

Step 8: support (29) bending subsidence quantitative determination preparation process: remove typed moving lifting platform (28), lifting supporting plate (30) is installed, amesdial (31) is arranged in lifting supporting plate (30), amesdial contact (32) is made to contact the lower surface of long joining section (17), by amesdial (31) reading playback zeroing.