CN206356605U - Use cylinder cylinder boring machine in steam turbine reformation scene - Google Patents

Abstract

Cylinder cylinder boring machine is used the utility model discloses a kind of steam turbine reformation scene, including boring bar, the knife rest of radial direction is disposed with the boring bar, adjust mechanism for axial adjusting of the knife rest along boring bar axial displacement, and driving boring bar rotates in a circumferential direction the actuating unit of action, before the knife rest, also corresponded on the boring bar at rear and be disposed with structure identical front support bearing and rear support bearing, before the front support bearing and rear support bearing and cylinder, the bearing housing of rear is corresponding, the front support bearing and rear support bearing are fixed on the bearing guard of correspondence bearing housing by arc pressuring plate and lock-screw respectively；The front support bearing is mainly made up of the tightening tapered sleeve, inner ring, self-aligning bearing, outer ring and the bearing block that are sequentially arranged from inside to outside together.The utility model effectively improve boring bar with machining accuracy of the movable knife rack to cylinder, it is economical, reliable, practical.

Description

Use cylinder cylinder boring machine in steam turbine reformation scene

Technical field

The utility model is related to cylinder boring machine, specifically a kind of cylinder cylinder boring machine at steam turbine reformation scene.

Background technology

The cylinder of Steam Turbine is to be applied to the scene of being on active service（Such as power plant）Important work device, it is in order to realizing It is stable, safe efficient, economically run, to the accuracy of manufacture require it is high.However, during the military service of Steam Turbine, with The change of various extraneous factors（Including Tong Liao area etc.）And the material internal that is induced of these extraneous factors and design structure Etc. the change of factor, there is certain deformation and damage in its cylinder, and this is accomplished by carrying out secondary operation to cylinder, so that cylinder is extensive The high accuracy of multiple design requirement.But, the cylinder of Steam Turbine belongs to large parts, its first assembling in Steam Turbine When, just it is welding as one structure with the associated components such as live pedestal, pipeline of being on active service, it is impossible to which its is light, easily disassembled laggard Hang Fan factories reprocess, and this is accomplished by carrying out secondary operation at steam turbine reformation scene to the cylinder of military service, so that cylinder recovers to set Count desired high accuracy.

At present, steam turbine reformation scene cylinder process equipment is predominantly portable, the cylinder boring machine of moveable boring machine-i.e., Its concrete structure is referring to " steam turbine scene cylinder boring machine bed " disclosed in Chinese patent literature（Publication number：CN 2710807, it is open Day：On July 20th, 2005）, the technology it is main by boring bar, the knife rest being arranged radially on boring bar, be arranged in boring bar in front of knife rest On preceding bearing shell, the rear bearing shell being arranged on the boring bar of knife rest rear, axial feed machine of the adjustment knife rest along boring bar axial displacement Structure and driving boring bar rotate in a circumferential direction action actuating unit composition.Although foregoing cylinder boring machine can be used in steam turbine reformation scene Cylinder carry out secondary operation, still, the structures shape of the cylinder boring machine its when carrying out cylinder processing, boring bar must be with knife rest The preceding bearing shell in front and the rear bearing shell at knife rest rear are supported on the cylinder of steam turbine, and this dependence bearing shell carries out circumferential rotation The supporting construction turned not only easily makes bearing bush abrasion, and the support accuracy of the boring bar to rotating in a circumferential direction is low, and this will necessarily be direct Influence the machining accuracy of cylinder so that the transformation difficulty of processing of cylinder is big, low precision, efficiency are low, not economical enough, reliable.

The content of the invention

Technical purpose of the present utility model is：The spy of cylinder transformation, reprocessing for above-mentioned steam turbine reformation scene There is provided one kind operation is easy, difficulty of processing is small, machining accuracy is high, economic height for different property and the deficiency of existing cylinder boring cylinder technology Cylinder cylinder boring machine is used at effect, reliable and practical steam turbine reformation scene.

The utility model realizes that the technical scheme that its technical purpose is used is：Use cylinder boring in a kind of steam turbine reformation scene The axially adjustable machine of the knife rest, adjustment knife rest of radial direction along boring bar axial displacement is disposed with cylinder machine, including boring bar, the boring bar Structure and driving boring bar rotate in a circumferential direction the actuating unit of action, are also corresponded on the boring bar of the forward and backward side of knife rest and are disposed with structure Identical front support bearing and rear support bearing, the front support bearing and rear support bearing and the bearing at the forward and backward position of cylinder Case is corresponding, and the front support bearing and rear support bearing are fixed on correspondence bearing housing by arc pressuring plate and lock-screw respectively Bearing guard on；The front support bearing is main by being sequentially arranged tightening tapered sleeve, inner ring, aligning axle together from inside to outside Hold, outer ring and bearing block are constituted.

Preferably, the bearing block periphery of the front support bearing and/or rear support bearing is disposed with polylith difference The allumen tile fragment of radial protrusion, in cylinder over-assemble, the bearing block of the front support bearing and/or rear support bearing leads to Tile fragment is crossed to contact with corresponding arc pressuring plate and bearing guard.

Preferably, the tool holder body of the knife rest is mainly combined successively by multiple spelling units by fastening bolt Form, be adjustable in length spreading structure.

Preferably, the tool rest of the knife rest is slidably slidedly assemblied in knife by axial tool setting mechanism On the connecting seat of frame body tail end；The axial tool setting mechanism is main by being constituted to knife screw mandrel and feed screw nut, described to knife silk Bar is so that on the support base that rotation is assemblied on connecting seat circumferential rotatably, the screw thread job step to knife screw mandrel extends to knife At seat, to being connected with knife screw mandrel to knife handwheel, the feed screw nut is fixed on tool rest and to the screw thread job step of knife screw mandrel Screw thread coordinates.Further, the tool rest and connecting seat are with together with swallow-tailed sliding pair respective outer side edges.

Preferably, it is equipped with boring cutter on the cutter holder of the knife rest, the cutter holder is by radial feed mechanism with can The mode of slip is slidedly assemblied on tool rest；The radial feed mechanism is mainly made up of power transmission shaft and trapezoidal screw, described to pass Moving axis is assemblied on tool rest with circumferential rotatably rotation, and one end of power transmission shaft is by unilateral bearing with being arranged on tool rest Feed handle be connected, the other end is connected by gear train with the bottom of trapezoidal screw, the top of the trapezoidal screw with Cutter holder is connected.Further, the cutter holder and tool rest are with together with swallow-tailed sliding pair respective outer side edges.

Preferably, the actuating unit on the boring bar is fluid motor-driven mechanism；The fluid motor-driven Mechanism mainly be sequentially connected by hydraulic station, hydraulic pump and by circulating oil path overflow valve, high pressure filter, fuel-displaced pressure gauge, Hydraulic motor, return pressure table and oil heat exchanger composition, the hydraulic motor arrangement is on boring bar, and on the hydraulic motor Provided with drain line.

Preferably, the boring bar be provided with radial direction Auxiliary support, the Auxiliary support be in on boring bar In the parallel plane of knife rest.Further, the Auxiliary support is the spreading structure of adjustable in length.

Advantageous effects of the present utility model are：

1. the utility model is provided with corresponding front support bearing and rear support bearing on the boring bar of the forward and backward side of knife rest, In cylinder over-assemble, the bearing housing that front support bearing and rear support bearing can be respectively with the forward and backward positions of cylinder forms corresponding Coordinate, not only clamping operation is easy, and boring bar can by back and front supporting bearing on the front and rear portions bearing housing of cylinder shape Into precision, stably, reliably assemble so that assembly precision of the boring bar on cylinder is high, whole transformation, reprocessing behaviour to cylinder Make easily, difficulty is small, efficiency high, and then effectively improves boring bar institute with machining accuracy of the movable knife rack to cylinder, economy, can Lean on, it is practical；

2. the assembling structure of front support bearing of the present utility model and/or rear support bearing on cylinder bearing housing, can Effectively ensure that spring bearing corresponds to the precision on bearing housing in cylinder, stably, reliably assembled, can be effectively prevented to cylinder again The stone roller wound on the bearing guard surface of bearing housing, damage, reliability are high；

3. cutter frame structure of the present utility model so that the utility model can effectively adapt to the vapour of different dimensions Cylinder transformation, reprocessing, versatility and flexibility are good；It can be realized radially and/or axially in relatively narrow and small cylinder space again To knife function, the flexibility operated in cylinder internal and reliability are effectively improved from another aspect, and then be conducive into one Reduction difficulty of processing, raising processing efficiency and the crudy of step, it is practical；

4. actuating unit of the present utility model can effectively prevent the peace brought by the factor such as unexpected overload or shutdown Full hidden danger, with enough, abundant driving torque, is conducive to realizing reliably high accuracy processing under safer environment, Overall structure of the present utility model and volume compact can be made again, so as to be conducive to improving the utility model in cylinder internal more Ease of use and flexibility in narrow space, further enhancing its practicality；

5. Auxiliary support of the present utility model can effectively improve structural strength of the boring bar in operation process, reduce Flexural deformation and amount of deflection change of the boring bar produced by operation process, stability are good.

Brief description of the drawings

Fig. 1 is a kind of structural representation of the present utility model.

Fig. 2 is assembling structure schematic diagram of front support bearing shown in Fig. 1 on cylinder bearing housing.

Fig. 3 is the structural representation of front support bearing shown in Fig. 1 and Fig. 2.

Fig. 4 is the structural representation of the radial feed mechanism on knife rest shown in Fig. 1.

Fig. 5 is the structural representation of the axial tool setting mechanism on knife rest shown in Fig. 1.

Fig. 6 is the hydraulic principle schematic diagram of fluid motor-driven mechanism shown in Fig. 1.

Code name implication in figure：1-boring bar；2-front support bearing；21-bearing block；22-inner ring；23-self-aligning bearing； 24-outer ring；25-back-up ring；26-tightening tapered sleeve；27-tile fragment；3-rear support bearing；4-fluid motor-driven mechanism； 41-hydraulic station；42-motor；43-hydraulic pump；44-overflow valve；45-high pressure filter；46-fuel-displaced pressure gauge；47— Snap joint；48-hydraulic motor；49-return pressure table；410-oil heat exchanger；411-check valve；412-drain mast Road；413-circulation line；5-knife rest；51-tool holder body；52-connecting seat；53-tool rest；54-boring cutter；55-cutter holder； 56-radial feed mechanism；561-feed handle；562-unilateral bearing；563-power transmission shaft；564-gear train；565-ladder Shape screw mandrel；57-axial direction tool setting mechanism；571-to knife handwheel；572-to knife screw mandrel；573-feed screw nut；6-auxiliary branch Support；7-mechanism for axial adjusting；71-hand wheel component；72-screw component；73-positioning component；8-bearing housing；81-locking Screw；82-arc pressuring plate.

Embodiment

The utility model is steam turbine reformation scene（Mainly apply the enterprises of Steam Turbine, such as power plant） Technology contents of the present utility model are described in detail by cylinder cylinder boring machine with reference to multiple embodiments, wherein 1 pair of embodiment Illustrated according to accompanying drawing, other embodiments individually draw accompanying drawing but can referring generally to embodiment 1 accompanying drawing.

Embodiment 1

Referring to shown in Fig. 1 to Fig. 6, the utility model includes boring bar 1, front support bearing 2, Auxiliary support 6, knife rest 5, rear branch Support bearing 3, actuating unit and mechanism for axial adjusting 7.Front support bearing 2, Auxiliary support 6, knife rest 5, rear support bearing 3 and power Mechanism is by preceding being sequentially arranged on boring bar 1 then, and front support bearing 2 and rear support bearing 3 should be with the cylinders transformed The bearing housing at forward and backward position is corresponding；The main hand wheel component 71 and positioning by being arranged in the two ends of boring bar 1 of mechanism for axial adjusting 7 Component 73 and constituted along the axial arranged screw component 72 of boring bar 1, hand wheel component 71 is directly or indirectly threadably nibbled Plying bar assembly 72, drives knife rest 5 to produce displacement along the axial direction of boring bar 1, realizes knife rest 5 by the screw component 72 rotated in a circumferential direction The adjustment of diverse location on boring bar 1.

Specifically, boring bar 1 of the front support bearing 2 being arranged on the boring bar 1 in the front of knife rest 5 with being arranged in the rear of knife rest 5 On rear support bearing 3 structure it is identical, only position is different.Before front support bearing 2 and rear support bearing 3 and cylinder, The bearing housing of rear is corresponding, in cylinder over-assemble, and front support bearing 2 and rear support bearing 3 pass through arc pressuring plate respectively On the bearing guard that correspondence bearing housing is fixed on lock-screw.It is described in detail before now exemplified by spring bearing 2, rear support The detailed construction of bearing 3 is not being repeated.

Front support bearing 2 is main by being sequentially arranged tightening tapered sleeve 26, inner ring 22, self-aligning bearing together from inside to outside 23rd, outer ring 24 and bearing block 21 are constituted.Tightening tapered sleeve 26 is formed by the polylith arc plate spelling in ring week；The endoporus of tightening tapered sleeve 26 External diameter assigned in boring bar 1, tightening tapered sleeve 26 is sleeved on boring bar 1, and the periphery of tightening tapered sleeve 26 is the ramp structure of taper；It was both Inner ring 22 can be made closely to be fixed on boring bar 1, disassembling section of the inner ring 22 on boring bar 1 can be conducive to again.In order to ensure outer The stability that circle 24 is assembled on bearing block 21, back-up ring 25 is connected between bearing block 21 and outer ring 24 by trip bolt, End face of the back-up ring 25 with fixing structure in bearing block 21 and outer ring 24 carries out spacing assembling.Self-aligning bearing 23 can effectively disappear Except the angular deviation of the axial line caused by the downwarp of boring bar 1.The periphery of bearing block 21 is connected with henry chloranthus herb block by trip bolt 27, this henry chloranthus herb block 27 scatter on the periphery of bearing block 21 and from the outer surface radial protrusion of bearing block 21, every piece of tile fragment 27 using the shaping of allumen material, and in cylinder over-assemble, the bearing block 21 of front support bearing 2 passes through tile fragment 27 and arc pressure The bearing guard contact of plate 82 and correspondence bearing housing 8, what the arc pressuring plate 82 under the connection of lock-screw 81 consolidated front support bearing 2 On the bearing guard for being assemblied in bearing housing 8.

Similarly, in cylinder over-assemble, the bearing block of rear support bearing 3 passes through tile fragment and arc pressuring plate and corresponding bearing The bearing guard contact of case, bearing guard of the assembling that the arc pressuring plate under lock-screw connection consolidates front support bearing in bearing housing On.

Certainly, should be by boring in front support bearing 2 and rear support bearing 3 before fixed on the corresponding bearing housing of cylinder The center of bar 1 and the center of cylinder carry out centering.

Auxiliary support 6 is arranged radially on the boring bar 1 between front support bearing 2 and knife rest 5, and the Auxiliary support 6 should be located On the sagittal plane of the boring bar 1 parallel with knife rest 5, it is used for front support bearing 2 and rear support in the Boring Process of knife rest 5 Boring bar 1 between bearing 3 carries out rigidity enhancing, reduces boring bar bending and amount of deflection change.

Above-mentioned Auxiliary support 6 is mainly made up of bearing assembly, many pile foundation supports and many piece-root grafting long stents.Bearing assembly is filled Fit on boring bar 1.Each pile foundation support is fixed on the periphery of bearing assembly, in the raised radially outward of bearing assembly.Respectively connect Long stent is fastened on corresponding each base rack by many fastening bolts respectively, forms the spreading to base rack, Spreading length can by the regulation of the linking length between the operation to fastening bolt and base rack and spreading support reality Now adjust, i.e., Auxiliary support 6 is that length can realize the spreading structure of adjustment, so as to flexibly adapt to various different sizes The use requirement of the cylinder of specification.

Knife rest 5 is arranged radially on the boring bar 1 between Auxiliary support 6 and rear support bearing 3, the knife rest 5 should be in On the sagittal plane of the parallel boring bar 1 of Auxiliary support 6.Knife rest 5 is main by sleeve, tool holder body 51, tool rest 52 and cutter holder 55 Composition.

The sleeve set of knife rest 5 is on boring bar 1, provided with the screw component with mechanism for axial adjusting 7 on the inwall of sleeve 72 screw threads being meshed, in the presence of mechanism for axial adjusting 7, sleeve realizes axial displacement on boring bar 1.Tool holder body 51 is led To be combined, by the increases of these spelling units or deleted, Neng Goushi successively by fastening bolt by multiple spelling units Now the length of tool holder body 51 is adjustable, i.e., tool holder body 51 is the spreading structure of adjustable in length；In tool holder body 51 Tail end is provided with the connecting seat 52 of connection tool rest 53.

Tool rest 53 passes through axial tool setting mechanism 57 slidably slidable fit（It is consistent with the axial direction of boring bar 1） On the connecting seat 52 of the tail end of tool holder body 51, the bottom surface of tool rest 53 is provided with the dovetail chute of indent, the top surface of connecting seat 52 Dovetail slide rail provided with evagination, tool rest 53 and connecting seat 52 are with together with swallow-tailed sliding pair respective outer side edges（Certainly, they Dovetail shaped slides auxiliary structure and can exchanged, i.e., the bottom surface of tool rest sets dovetail slide rail, and the top surface of connecting seat sets dovetail to slide Groove）.Axial tool setting mechanism 57 is main by being constituted to knife screw mandrel 572 and feed screw nut 573；To knife screw mandrel 572 with the cunning of tool rest 53 Dynamic direction passes through bearing（It can also save, but the less effective that rotates in a circumferential direction）On the support base for being arranged in connecting seat 52, to knife silk The screw thread job step of bar 572 is extended at the outer surface of tool rest 53, being connected with to the end of knife screw mandrel 572 on the outside of support base To knife handwheel 571, by the way that to the rotation process to knife handwheel 571, the circumferential rotation on support base to knife screw mandrel 572 can be realized Turn, i.e., to knife screw mandrel 572 with the support base that rotation is assemblied on connecting seat 52 circumferential rotatably；Feed screw nut 573 On the outer surface that tool rest 53 is fixed on by trip bolt, screw axis and the axis to knife screw mandrel 572 of feed screw nut 573 Basically identical, feed screw nut 573 is threadably combined together with the screw thread job step to knife screw mandrel 572, so that, pass through week To the adjustment of displacement realized to knife screw mandrel 572 to tool rest 53 on connecting seat 52 of rotation.

Boring cutter 54 is equipped with cutter holder 55.Cutter holder 55 passes through the slidably slidable fit of radial feed mechanism 56 （It is consistent with the radial direction of boring bar 1）On tool rest 53, vertical, indent dovetail is provided with the boring cutter clamping face of tool rest 53 Chute, dovetail slide rail of the clamping face provided with vertical, evagination of cutter holder 55, tool rest 53 is with cutter holder 55 with swallow-tailed sliding pair Respective outer side edges are together（Certainly, their dovetail shaped slides auxiliary structure and can exchanged, i.e., set on the boring cutter clamping face of tool rest Put and dovetail chute is set on dovetail slide rail, the clamping face of cutter holder）.Radial feed mechanism 56 is main by power transmission shaft 563 and trapezoidal silk Bar 565 is constituted；Power transmission shaft 563 is with the glide direction of tool rest 53（That is the axial direction of boring bar 1）Base 53 is arranged in by bearing Bottom, one end end correspondence of power transmission shaft 563 extends the end face of tool rest 53, cutter holder 55 in the lower section of cutter holder 55, the other end The power transmission shaft 563 of lower section is provided with gear train 564, and the power transmission shaft 563 for extending the end face of tool rest 53 is provided with unilateral bearing 562, The end of tool rest 53 corresponding to the unilateral bearing 562 is provided with support frame, is provided with what is be connected with unilateral bearing 562 on support frame Feed handle 561, by the rotation process to feed handle 561, can realize power transmission shaft 563 on support frame and tool rest 53 Rotate in a circumferential direction, i.e., power transmission shaft 563 is assemblied on tool rest 53 with circumferential rotatably rotation；The top of trapezoidal screw 565 with The bottom of cutter holder 55 links together, and bottom and the gear train 564 of trapezoidal screw 565 link together；Gear train 564 is generally adopted Be 45 ° of bevel gear set with helical angle, with its by rotation from the revolving force of horizontal power transmission shaft 563 to vertical trapezoidal screw 565 Turn the transmission of power, so that, realize that the driving to trapezoidal screw 565 rotates by the power transmission shaft 563 rotated in a circumferential direction, and then with moving knife 55 adjustment of displacement on tool rest 53 is pressed from both sides, the radial feed of boring cutter 54 is realized.

Actuating unit is arranged in the rear end end of rear support bearing 3 and boring bar 1（That is positioning component 73）Between, actuating unit Rotated in a circumferential direction for driving boring bar 1 to realize, the boring bar 1 rotated in a circumferential direction can realize that boring is done work with movable knife rack 5.Previous power machine Structure is fluid motor-driven mechanism 4, and the fluid motor-driven mechanism 4 is main by hydraulic station 41, hydraulic pump 43, circulation line 413 Constituted with drain line 412；Hydraulic station 41 is used to store, concentrate hydraulic oil（Including newly increase, recycle oil etc.）；Hydraulic pump 43 For closed type hydraulic pump, hydraulic pump 43 is used under the driving of motor 42, realizes the hydraulic oil in hydraulic station 41 in circulation line Pumping in 413；On circulation line 413 overflow valve 44, high pressure filter 45, fuel-displaced pressure gauge are connected with turn by circulating oil path 46th, the primary clustering such as snap joint 47, hydraulic motor 48, snap joint, return pressure table 49 and oil heat exchanger 410, in oil Circulation line 413 at heat exchanger 410 is provided with check valve 411 in parallel, and hydraulic motor 48 is arranged on boring bar 1, is used for Boring bar 1 is driven to rotate in a circumferential direction in the presence of hydraulic oil.Drain line 412 is connected on hydraulic motor 48, in drain line 412 The primary clusterings such as snap joint, check valve, oil catcher are connected with turn by oil circuit flow.

The hand wheel component 71 and positioning component 73 of mechanism for axial adjusting 7 are split in the two ends end of boring bar 1.Positioning component 73 For carrying out axially position, and then the play of the boring bar 1 when preventing from processing outside the bearing housing of cylinder.Hand wheel component 71 is used for Rotating in a circumferential direction for drive screw component 72, i.e., under the rotating in a circumferential direction of hand wheel component 71, realize the screw component engaged to screw thread 72 driving rotated in a circumferential direction, the screw component 72 rotated in a circumferential direction realizes the driving of the knife rest 5 to being assembled on boring bar 1, and then Knife rest 5 is set to realize axial displacement on boring bar 1.

Embodiment 2

Other contents of the present embodiment are same as Example 1, and difference is：Auxiliary support structure is eliminated, i.e., originally Utility model is mainly made up of boring bar, front support bearing, knife rest, rear support bearing, actuating unit and mechanism for axial adjusting, preceding branch Support bearing, knife rest, rear support bearing and actuating unit are by preceding being sequentially arranged on boring bar then.

Embodiment 3

Other contents of the present embodiment are same as Example 1, and difference is：Actuating unit is motor+decelerator group Structure is closed, this actuating unit is arranged in the end of boring bar.

Embodiment 4

Other contents of the present embodiment are same as Example 1, and difference is：Knife rest is can not adjusting for length fixation Structure.

Embodiment 5

Other contents of the present embodiment are same as Example 1, and difference is：Auxiliary support can not for length fixation Adjust structure.

Various embodiments above is only to illustrate the utility model, rather than its limitations；Although with reference to the various embodiments described above pair The utility model is described in detail, it will be understood by those within the art that：The utility model still can be right Concrete technical scheme in the various embodiments described above is modified, or to which part technical characteristic progress equivalent substitution, and this A little modifications are replaced, and the essence of appropriate technical solution is departed from spirit and scope of the present utility model.

Claims (10)

1. cylinder cylinder boring machine, including boring bar are used in a kind of steam turbine reformation scene（1）, the boring bar（1）On be disposed with the knife of radial direction Frame（5）, adjustment knife rest（5）Along boring bar（1）The mechanism for axial adjusting of axial displacement（7）And driving boring bar（1）Rotate in a circumferential direction The actuating unit of action, it is characterised in that：The knife rest（5）The boring bar of forward and backward side（1）On also correspond to be disposed with structure identical Front support bearing（2）With rear support bearing（3）, the front support bearing（2）With rear support bearing（3）With the forward and backward position of cylinder Bearing housing it is corresponding, the front support bearing（2）With rear support bearing（3）Fixed respectively by arc pressuring plate and lock-screw On the bearing guard of correspondence bearing housing；The front support bearing（2）The main tightening by being sequentially arranged from inside to outside together is bored Set（26）, inner ring（22）, self-aligning bearing（23）, outer ring（24）And bearing block（21）Composition.

2. cylinder cylinder boring machine is used at steam turbine reformation scene according to claim 1, it is characterised in that：The front support bearing （2）And/or rear support bearing（3）Bearing block periphery be disposed with polylith distinguish radial protrusion allumen tile fragment（27）, During cylinder over-assemble, the front support bearing（2）And/or rear support bearing（3）Bearing block pass through tile fragment（27）With it is corresponding Arc pressuring plate and bearing guard contact.

3. cylinder cylinder boring machine is used at steam turbine reformation scene according to claim 1, it is characterised in that：The knife rest（5）Knife Frame body（51）Mainly combined successively by fastening bolt by multiple spelling units, be adjustable in length spreading structure.

4. cylinder cylinder boring machine is used at steam turbine reformation scene according to claim 1 or 3, it is characterised in that：The knife rest（5）'s Tool rest（53）Pass through axial tool setting mechanism（57）Slidably it is slidedly assemblied in tool holder body（51）The connecting seat of tail end （52）On；The axial tool setting mechanism（57）Mainly by knife screw mandrel（572）And feed screw nut（573）Composition, it is described to knife silk Bar（572）Connecting seat is assemblied in circumferential rotatably rotation（52）On support base on, to knife screw mandrel（572）Screw thread Job step extends to tool rest（53）Place, to knife screw mandrel（572）On be connected with to knife handwheel（571）, the feed screw nut（573）Gu It is scheduled on tool rest（53）Above and to knife screw mandrel（572）Screw thread job step screw thread coordinate.

5. cylinder cylinder boring machine is used at steam turbine reformation scene according to claim 4, it is characterised in that：The tool rest（53）With connecting Joint chair（52）With swallow-tailed sliding pair respective outer side edges together.

6. cylinder cylinder boring machine is used at steam turbine reformation scene according to claim 1 or 3, it is characterised in that：The knife rest（5）'s Cutter holder（55）On be equipped with boring cutter（54）, the cutter holder（55）Pass through radial feed mechanism（56）Slidably slide dress Fit over tool rest（53）On；The radial feed mechanism（56）Mainly by power transmission shaft（563）And trapezoidal screw（565）Composition, it is described Power transmission shaft（563）Tool rest is assemblied in circumferential rotatably rotation（53）On, power transmission shaft（563）One end pass through one-way shaft Hold（562）With tool rest（53）On the feed handle arranged（561）It is connected, the other end passes through gear train（564）With trapezoidal silk Bar（565）Bottom be connected, the trapezoidal screw（565）Top and cutter holder（55）It is connected.

7. cylinder cylinder boring machine is used at steam turbine reformation scene according to claim 6, it is characterised in that：The cutter holder（55）With knife Seat（53）With swallow-tailed sliding pair respective outer side edges together.

8. cylinder cylinder boring machine is used at steam turbine reformation scene according to claim 1, it is characterised in that：The boring bar（1）On Actuating unit is fluid motor-driven mechanism（4）；The fluid motor-driven mechanism（4）Mainly by hydraulic station（41）, hydraulic pump （43）And the overflow valve being sequentially connected by circulating oil path（44）, high pressure filter（45）, fuel-displaced pressure gauge（46）, hydraulic motor （48）, return pressure table（49）And oil heat exchanger（410）Composition, the hydraulic motor（48）It is arranged in boring bar（1）On, and institute State hydraulic motor（48）It is provided with drain line（412）.

9. cylinder cylinder boring machine is used at steam turbine reformation scene according to claim 1, it is characterised in that：The boring bar（1）On set There is the Auxiliary support of radial direction（6）, the Auxiliary support（6）It is in and boring bar（1）On knife rest（5）In parallel plane.

10. cylinder cylinder boring machine is used at steam turbine reformation scene according to claim 9, it is characterised in that：The Auxiliary support（6） For the spreading structure of adjustable in length.