CN206253857U - A kind of prosthetic device of conduit - Google Patents
A kind of prosthetic device of conduit Download PDFInfo
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- CN206253857U CN206253857U CN201621314835.5U CN201621314835U CN206253857U CN 206253857 U CN206253857 U CN 206253857U CN 201621314835 U CN201621314835 U CN 201621314835U CN 206253857 U CN206253857 U CN 206253857U
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Abstract
This application discloses a kind of prosthetic device of conduit, for being repaired to tube head damaged in indirect air cooling system, including：The damaged portion of tube head empties mechanism in removal tube sheet through hole；The tube expanding mechanism of tube expansion operation is carried out to repairing tubule；The fixed length cutting mechanism that the part of the tube sheet through hole is blocked is stretched out to repairing extra heavy pipe and the repairing tubule.The prosthetic device that the utility model is provided, by using emptying mechanism, tube expanding mechanism and fixed length cutting mechanism, reparation extra heavy pipe can be made to replace the damaged portion of tube head, and using repairing the remaining tube head of tubule connection and repairing extra heavy pipe, to form new tube head, both avoided the integral replacing of heat-exchanging tube bundle, turn avoid depot repair, drain on manpower and material resources is reduced, maintenance cost is reduced so that indirect air cooling system can simply, efficiently be realized repairing.
Description
Technical field
The utility model is related to generating equipment technical field, more particularly to a kind of prosthetic device of conduit.
Background technology
Indirect air cooling system is to ensure thermal power plant normally one of key equipment of operation, so to indirect air cooling system
Maintenance and Repair also as thermal power plant the most important thing.
The main working parts of indirect air cooling system are heat-exchanging tube bundle, and the cooling water of high temperature can be with its internal flow
Air is exchanged heat and is realized the reduction of cooling water temperature.Heat-exchanging tube bundle is typically realized support and is constrained, tube sheet by tube sheet 01
Multiple through holes 02 are offered on 01, as shown in figure 1, being worn by one section of conduit (being subsequently referred to as tube head 03) in each through hole 02
Cross, and the outer wall of tube head 03 is brought into close contact and achieves a fixed connection with the inwall of through hole 02, and positioned at the both sides of tube sheet 01, composition is changed
Multiple heat exchanger tubes of heat pipe bundle are man-to-man to realize connection by different tube heads 03.
Due to containing more fine sand in cooling water, so after heat-exchanging tube bundle work a period of time, heat-exchanging tube bundle is mixed
Conjunction can cause a certain degree of abrasion under having the impact of the cooling water of fine sand, and because the current by tube head are more concentrated, institute
It is subject to the degree of impact wear maximum with tube head, often occurs damaged and trigger leakage crisis so as to make at tube head, it is serious to threaten
The safe operation of unit.
And in the prior art, the common practice repaired to pipeline is directly to change whole heat-exchanging tube bundle or return factory
Maintenance.If directly changing whole heat-exchanging tube bundle, not only cost is huge but also procedure complexity, and maintenance efficiency is extremely low；If
Returning factory then can not only consume substantial amounts of human and material resources, and (about 3 months) can influence the normal of thermal power plant for a long time
Operation.
Therefore, how simply, efficiently exchange heat pipe bundle is realized repairing, and has become current those skilled in the art urgently
The problem of solution.
Utility model content
In view of this, the utility model provides a kind of prosthetic device of conduit, and it can simply, efficiently realize exchange
The reparation of heat pipe bundle, without integral replacing heat-exchanging tube bundle or depot repair.
In order to achieve the above object, the utility model provides following technical scheme：
A kind of prosthetic device of conduit, for being repaired to tube head damaged in indirect air cooling system, including：
The damaged portion of tube head empties mechanism in removal tube sheet through hole；
The tube expanding mechanism of tube expansion operation is carried out to repairing tubule；
The fixed length cutting mechanism that the part of the tube sheet through hole is blocked is stretched out to repairing extra heavy pipe and the repairing tubule.
Preferably, in the prosthetic device of above-mentioned conduit, the mechanism that empties includes：
Rig；
It is connected with the drill bit of the rig and serrate grinding pipe is set on end face, the grinding pipe can be by described
Sawtooth is ground to the tube head in the tube sheet through hole；
It is fixedly connected with the rig, and is set in the positioning pipe on the outside of the drill bit and the grinding pipe；
It is set on the positioning pipe, can be slided on the positioning pipe and fixed positioning disk.
Preferably, in the prosthetic device of above-mentioned conduit, the positioning disk and the positioning pipe are realized admittedly by adjusting screw
Fixed connection.
Preferably, in the prosthetic device of above-mentioned conduit, the tube expanding mechanism includes：
With diameter greater than the swollen head of the repairing tubule；
It is connected with the swollen head, and the steel wire rope of the repairing tubule inner chamber can be passed through；
It is arranged on support, the reel for winding the steel wire rope.
Preferably, in the prosthetic device of above-mentioned conduit, the swollen head and the steel wire rope are to be detachably connected.
Preferably, in the prosthetic device of above-mentioned conduit, also swing handle and drive including being arranged on the reel.
Preferably, in the prosthetic device of above-mentioned conduit, the fixed length cutting mechanism includes：
The cutting sleeve on the repairing extra heavy pipe outside can be set in；
One end of the cutting sleeve is arranged on, the repairing extra heavy pipe and described in the cutting sleeve can be pointed to
The cutting tool that repairing tubule is cut.
The prosthetic device of the conduit that the utility model is provided, specific operation process is：Order is arranged on the pipe in tube sheet through hole
Head is separated with heat-exchanging tube bundle, and the damaged portion of tube head then is removed out into tube sheet through hole using emptying mechanism；Choose thick, thin afterwards
Two kinds of pipeline sections of model (repair extra heavy pipe and repairing tubule, and repair the diameter of extra heavy pipe and lead to close to tube sheet as patching material
The internal diameter in hole), repairing tubule includes linkage section and suit section, and repairing extra heavy pipe fixation is set on the outer wall of suit section,
It is relatively fixed both；Then the repairing extra heavy pipe of suit and repairing tubule are inserted into tube sheet through hole, and tubule will be repaired
Linkage section is extend into remaining tube head；Tube expansion operation is carried out to repairing extra heavy pipe and repairing tubule using tube expanding mechanism afterwards so that
The diameter of repairing extra heavy pipe and repairing tubule increases, and then realizes that the outer wall of linkage section and the inwall of remaining tube head mutually extrude patch
The outer wall and tube sheet through hole that conjunction, the outer wall of suit section mutually extrude extra heavy pipe of fitting, repair with the inwall of repairing extra heavy pipe are mutually extruded
Laminating, and then realize remaining tube head, repair tubule and repair tight connection of the extra heavy pipe in tube sheet through hole, so that repairing extra heavy pipe generation
For the damaged portion of tube head, and repair tubule and then connect remaining tube head and repairing extra heavy pipe, and the circulation duct as cooling water；Most
Break-in operation is carried out to the part that repairing extra heavy pipe and repairing tubule stretch out tube sheet through hole using fixed length cutting mechanism afterwards, to have obtained
Whole new tube head, makes tube head be repaired.The prosthetic device that the utility model is provided, by using emptying mechanism, electric tube expander
Structure and fixed length cutting mechanism, can make reparation extra heavy pipe replace the damaged portion of tube head, and connect remaining tube head using tubule is repaired
With reparation extra heavy pipe, to form new tube head, the integral replacing of heat-exchanging tube bundle was both avoided, turn avoid depot repair, reduced
Drain on manpower and material resources, reduces maintenance cost so that indirect air cooling system can simply, efficiently be realized repairing.
Brief description of the drawings
In order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art, below will be to embodiment
Or the accompanying drawing to be used needed for description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is embodiment of the present utility model, for those of ordinary skill in the art, on the premise of not paying creative work, also
Other accompanying drawings can be obtained according to the accompanying drawing for providing.
Fig. 1 is the structural representation of tube sheet and tube head；
Fig. 2 is inserted into schematic diagram during tube sheet through hole for repairing extra heavy pipe in mending course and repairing tubule；
The structural representation for emptying mechanism of the prosthetic device of the guide rail that Fig. 3 is provided for the utility model；
Fig. 4 is the operating diagram of tube expanding mechanism；
Fig. 5 is the structural representation of fixed length cutting mechanism；
Fig. 6 is the right view of Fig. 5.
In Fig. 1-Fig. 6：
01- tube sheets, 02- through holes, 03- tube heads；
1- empties mechanism, 2- tube expanding mechanisms, 3- fixed length cutting mechanisms, 4- tube sheets, 5- tube sheet through holes, 6- repairing extra heavy pipes, 7-
Repairing tubule, 8- residue tube heads；
11- rigs, 12- drill bits, 13- grinding pipes, 14- positioning pipes, 15- positioning disks, 16- adjusting screws, 17- end faces, 21-
Swollen head, 22- steel wire ropes, 23- reels, 24- swing handles, 25- supports, 31- cutting sleeves, 32- cutting tools.
Specific embodiment
The utility model provides a kind of prosthetic device of conduit, and it can simply, efficiently realize exchanging heat pipe bundle
Repair, without integral replacing heat-exchanging tube bundle or depot repair.
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment for being obtained, belongs to the scope of the utility model protection.
As shown in Fig. 2-Fig. 6, the utility model embodiment provide firstly a kind of restorative procedure of conduit, and it is right to be mainly used in
Damaged tube head is repaired in indirect air cooling system, and it is comprised the following steps：
S101, the tube head in tube sheet through hole 5 is made to be separated with heat-exchanging tube bundle, then using emptying mechanism 1 by the breakage of tube head
Part removes out tube sheet through hole 5.When separating, can only make to offer the heat-exchanging tube bundle of the side of tube sheet 4 of tube sheet through hole 5 and pipe
Tube head on plate 4 is separated, it is also possible to the heat-exchanging tube bundle of the both sides of tube sheet 4 is separated with tube sheet 4.
Extra heavy pipe therein section is referred to as repairing extra heavy pipe by S102, the pipeline section of thick, the thin two kinds of models of selection as patching material
6, tubule section is referred to as repairing tubule 7, this repairing tubule 7 specifically includes suit section and linkage section (suit section and linkage section again
Be structure as a whole), and its diameter be less than remaining tube head 8 (remaining tube head 8 refer to tube head broken segment be removed after residue
Part) internal diameter.The fixation of extra heavy pipe 6 will be repaired to be set on the outer wall of suit section, and keep repairing extra heavy pipe 6 with repairing tubule 7
Be relatively fixed, and the linkage section for repairing tubule 7 then stretch out repairing extra heavy pipe 6.Afterwards, the steel wire rope 22 of tube expanding mechanism 2 is made to pass through
Repairing tubule 7, steel wire rope 22 through end be connected with swollen first 21 again.
S103 then will repairing extra heavy pipe 6, repairing tubule 7 and swollen first 21 be inserted into tube sheet through hole 5, and make linkage section and
Swollen first 21 extend into remaining tube head 8；
S104, carry out tube expansion operation using the repairing tubules 7 of tube expanding mechanism 2 pairs and (swollen head is mainly pulled by steel wire rope 22
Moved in 21 repairing compensatory time dry 7, to support swollen repairing tubule 7, increase its diameter), make the outer wall of linkage section and remaining tube head 8
Inwall mutually extrudes laminating, realizes the tight connection of repairing tubule 7 and remaining tube head 8, is set with the outer wall and repairing extra heavy pipe 6 of section
Inwall mutually extrudes laminating, realizes repairing tubule 7 with the tight connection and residue tube head 8 and repairing extra heavy pipe 6 for repairing extra heavy pipe 6
Connection, and the outer wall of repairing extra heavy pipe 6 is fitted with the mutually extruding of tube sheet through hole 5, to realize repairing extra heavy pipe 6 with tube sheet through hole 5
Closely connection, so as to realize the tight connection of remaining tube head 8, repairing tubule 7, repairing extra heavy pipe 6 and tube sheet through hole 5.More managing
It is above-mentioned closely to be connected as being tightly connected in the case of thinking.
In order that repair process is more perfect, after the above step is finished, further preferably follow the steps below：
S105, the size according to technological requirement, use 3 pairs of repairing extra heavy pipes 6 of fixed length cutting mechanism and the repairing protruded tube of tubule 7
The part of plate through hole 5 is blocked, so that complete new tube head is formed, to be reconnected with heat-exchanging tube bundle；
S106, the opening in tube sheet through hole 5, pacify in the annulus between sealing repairing extra heavy pipe 6 and tube sheet through hole 5
Dress sealing ring, further to improve the sealing effectiveness between new tube head and tube sheet through hole 5.
During aforesaid operations, in order to improve connection, sealing effectiveness, the present embodiment is carrying out the operation of step S104
When, it is classified as twice being operated：First, a tube expansion operation is carried out to repairing tubule 7, that is, uses the first model
The swollen first swollen repairing tubule 7 of 21 support, so as to the outer wall of linkage section is mutually extruded with the inwall of remaining tube head 8 fit, outside suit section
Wall is mutually extruded with the inwall of repairing extra heavy pipe 6 and fitted；Then, secondary pipe-expanding operation is carried out to repairing tubule 7, i.e., it is big using diameter
Carry out that secondary support is swollen in swollen first 21 pairs of repairings tubule 7 of second model of the first model swollen first 21, increase repairing is thin again
The diameter of pipe 7 and repairing extra heavy pipe 6, so that the outer wall of repairing extra heavy pipe 6 is fitted with the mutually extruding of tube sheet through hole 5.
Preferably, in the operating process of step S103, the depth that preferably linkage section is extend into remaining tube head 8 is
390mm~410mm or 290mm~310mm.The selection of this depth bounds, is prevented from stress concentration in the same horizontal line, most
The remaining tube head 8 of raising and connection, the sealing effectiveness of repairing tubule 7 of big degree.Certainly, connection, sealing basic demand are being ensured
On the premise of, the depth that linkage section is extend into remaining tube head 8 can also be other spans, and the present embodiment does not do to this
Limit.
In the present embodiment, preferably repair extra heavy pipe 6 and repairing tubule 7 is aluminium-alloy pipe, and repair a diameter of of tubule 7
21mm~25mm, the diameter for repairing extra heavy pipe 6 is identical with the diameter of remaining tube head 8.Why extra heavy pipe 6 and repairing tubule are preferably repaired
7 are aluminium-alloy pipe, except being in order to be consistent with original tube head material, to improve repair efficiency, also as aluminium alloy
Material and other metal phase ratios, with good ductility, and quality is softer, is not only convenient for processing, it is also possible to after making tube expansion
Connection, sealing effectiveness can reach most preferably.
Based on the restorative procedure of above-mentioned conduit, the present embodiment additionally provides a kind of reparation dress suitable for the restorative procedure
Put, it includes：The damaged portion of tube head empties mechanism 1 in removal tube sheet through hole 5；Tube expansion operation is carried out to repairing tubule 7
Tube expanding mechanism 2；The fixed length cutting mechanism 3 that the part of tube sheet through hole 5 is blocked is stretched out to repairing extra heavy pipe 6 and repairing tubule 7.
In the present embodiment, preferably emptying mechanism 1 includes：Rig 11；It is connected with the drill bit 12 of rig 11 and is set on end face 17
Serrate grinding pipe 13 is put, the grinding pipe 13 can be ground by sawtooth to the tube head in tube sheet through hole 5；With rig 11
It is fixedly connected, and is set in the positioning pipe 14 in drill bit 12 and the outside of grinding pipe 13；It is set on positioning pipe 14, can be relative to fixed
The positioning disk 15 that position pipe 14 is slided and fixed, as shown in Figure 3.The Main Function of mechanism 1 is emptied, is by the damaged portion of original tube head
Divide and removed from tube sheet through hole 5, said mechanism makes positioning disk 15 be moved on positioning pipe 14, finds permission accurately when in use, first
The depth that grinding pipe 13 is entered into tube sheet through hole 5, i.e. positioning disk 15 are (fixed by the distance in the present embodiment with the distance of end face 17
It is the depth of secondary pipe-expanding section start), then positioning disk 15 is fixed on positioning pipe 14, grinding pipe 13 is had into serrate end
Face 17 and tube head part contact to be removed, open rig 11, make drill bit 12 drive grinding pipe 13 to rotate, and sawtooth is carried out to tube head
Grinding, with going deep into for grinding, when positioning disk 15 is contacted with tube sheet 4, that is, reaches the size requirement of removal, stops grinding behaviour
Make, and grinding pipe 13 is taken out from tube sheet through hole 5.In addition it is also possible to using existing suitable cutter, by manual operations
Mode, be removed operation.
Specifically, positioning disk 15 and positioning pipe 14 are achieved a fixed connection by adjusting screw 16, as shown in Figure 3.By pine
The mode of tight screw, realizes the relative movement and fixation of positioning disk 15 and positioning pipe 14, can fast and easily realize regulation behaviour
Make, and adjustment structure is simple, is easy to processing, so as preferred scheme.In addition to aforesaid way, the present embodiment can also be adopted
Realized finding positioning accurately with such as structure such as latch, draw-in groove.
As shown in figure 4, tube expanding mechanism 2 includes：With diameter greater than swollen first the 21 of repairing tubule 7；It is connected with swollen first 21, and is used for
Through the steel wire rope 22 of repairing tubule 7 inner chamber；It is arranged on support 25, for the reel 23 of lay winding wire ropes 22.Swollen first 21 are
Front portion is connected in cylindrical part, steel wire rope 22 in cone, rear portion with the cone of front portion.When tube expansion operation is carried out, turn
Movable reel 23 makes swollen first 21 to enter into the inner chambers for repairing tubule 7 to pull steel wire rope 22 and connected swollen first 21, and
Moved in inner chamber, the tube wall of swollen first 21 pairs of repairings tubule 7 applies support expansive force (extruding force in other words) in moving process, so that repairing
The diameter of tubule 7 becomes big.
It is more preferred, make swollen first 21 and steel wire rope 22 to be detachably connected, steel wire rope 22 can thus connected not
With swollen first the 21 of diameter, to meet different job requirements, the versatility of tube expanding mechanism 2 is improve.
Further, in the prosthetic device of the conduit that the present embodiment is provided, the also turning handle including being arranged on reel 23
Hand 24 (as shown in Figure 4) and drive (not shown).In the present embodiment, swing handle 24 is set preferably on reel 23,
Pull swollen first 21 movement by way of artificial rotary motion handle 24, this kind of mode can be according to actual tube expansion situation, more
Plus flexibly, swollen first 21 translational speed is timely controlled, so as to preferably ensure expander tube quality.It is of course also possible to use driving
Device is connected with drive (drive can be gear, sprocket wheel or belt pulley etc.), realizes swollen first 21 automatic pulling.
As shown in Figure 5 and Figure 6, fixed length cutting mechanism 3 includes in the present embodiment：Can be set on the outside of repairing extra heavy pipe 6
Cutting sleeve 31；One end of cutting sleeve 31 is arranged on, the repairing extra heavy pipe 6 and repairing that can be pointed to cut in sleeve 31 are thin
The cutting tool 32 that pipe 7 is cut., it is necessary to the unnecessary repairing extra heavy pipe 6 for stretching out tube sheet 4 and repair after new tube head is molded
Tubule 7 is cut, to ensure the normal connection with heat-exchanging tube bundle.And in order to further improve simple operation and precision,
The present embodiment is preferably cut unnecessary repairing extra heavy pipe 6 and repairing tubule 7 using fixed length cutting mechanism 3, the fixed length cutter
Structure 3 has a cutting sleeve 31 for regular length (this length can choose the length of technological requirement), when being operated, will
Cutting sleeve 31 is set on repairing extra heavy pipe 6, and the one end for making cutting sleeve 31 be not provided with cutting tool 32 vertical with tube sheet 4 connects
Touch, then repair extra heavy pipe 6 with sleeve 31 is cut and be provided with the position that the other end of cutting tool 32 is flushed, as technological requirement is cut
Position is cut, is rotated and is cut sleeve 31, cut 32 pairs of repairing extra heavy pipes 6 of cutting tool and repairing tubule 7, until will repair thick
Pipe 6 and repairing tubule 7 are blocked.When this operation is carried out, it is also possible to use universal cutter, the present embodiment not to limit this.
Each part is described by the way of progressive in this specification, what the structure of each part was stressed is
With the difference of existing structure, the entirety and part-structure of the prosthetic device of conduit can be by combining the knot of above-mentioned various pieces
Structure and obtain.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or new using this practicality
Type.Various modifications to these embodiments will be apparent for those skilled in the art, determine herein
The General Principle of justice can in other embodiments be realized in the case where spirit or scope of the present utility model are not departed from.Cause
This, the utility model is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The most wide scope consistent with features of novelty.
Claims (7)
1. a kind of prosthetic device of conduit, it is characterised in that for being repaired to tube head damaged in indirect air cooling system, wrap
Include：
The damaged portion of tube head empties mechanism in removal tube sheet through hole；
The tube expanding mechanism of tube expansion operation is carried out to repairing tubule；
The fixed length cutting mechanism that the part of the tube sheet through hole is blocked is stretched out to repairing extra heavy pipe and the repairing tubule.
2. the prosthetic device of conduit according to claim 1, it is characterised in that the mechanism that empties includes：
Rig；
It is connected with the drill bit of the rig and serrate grinding pipe is set on end face, the grinding pipe can be by the sawtooth
The tube head in the tube sheet through hole is ground；
It is fixedly connected with the rig, and is set in the positioning pipe on the outside of the drill bit and the grinding pipe；
It is set on the positioning pipe, can be slided on the positioning pipe and fixed positioning disk.
3. the prosthetic device of conduit according to claim 2, it is characterised in that the positioning disk and the positioning pipe pass through
Adjusting screw achieves a fixed connection.
4. the prosthetic device of conduit according to claim 1, it is characterised in that the tube expanding mechanism includes：
With diameter greater than the swollen head of the repairing tubule；
It is connected with the swollen head, and the steel wire rope of the repairing tubule inner chamber can be passed through；
It is arranged on support, the reel for winding the steel wire rope.
5. the prosthetic device of conduit according to claim 4, it is characterised in that the swollen head and the steel wire rope are removable
Unload connection.
6. the prosthetic device of conduit according to claim 4, it is characterised in that also including being arranged on turning on the reel
Dynamic handle and drive.
7. the prosthetic device of the conduit according to any one in claim 1-6, it is characterised in that the fixed length cutter
Structure includes：
The cutting sleeve on the repairing extra heavy pipe outside can be set in；
One end of the cutting sleeve is arranged on, the repairing extra heavy pipe cut in sleeve and the repairing can be pointed to
The cutting tool that tubule is cut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621314835.5U CN206253857U (en) | 2016-12-01 | 2016-12-01 | A kind of prosthetic device of conduit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621314835.5U CN206253857U (en) | 2016-12-01 | 2016-12-01 | A kind of prosthetic device of conduit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206253857U true CN206253857U (en) | 2017-06-16 |
Family
ID=59027880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621314835.5U Active CN206253857U (en) | 2016-12-01 | 2016-12-01 | A kind of prosthetic device of conduit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206253857U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106736229A (en) * | 2016-12-01 | 2017-05-31 | 华电重工股份有限公司 | The restorative procedure and prosthetic device of a kind of conduit |
| CN107053646A (en) * | 2017-07-06 | 2017-08-18 | 成都联创精密机械有限公司 | A kind of special tube expansion instrument |
| CN112570979A (en) * | 2020-12-28 | 2021-03-30 | 天脊煤化工集团股份有限公司 | Repairing method of fixed tube-plate heat exchanger |
-
2016
- 2016-12-01 CN CN201621314835.5U patent/CN206253857U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106736229A (en) * | 2016-12-01 | 2017-05-31 | 华电重工股份有限公司 | The restorative procedure and prosthetic device of a kind of conduit |
| CN106736229B (en) * | 2016-12-01 | 2019-03-15 | 华电重工股份有限公司 | A kind of restorative procedure and prosthetic device of conduit |
| CN107053646A (en) * | 2017-07-06 | 2017-08-18 | 成都联创精密机械有限公司 | A kind of special tube expansion instrument |
| CN112570979A (en) * | 2020-12-28 | 2021-03-30 | 天脊煤化工集团股份有限公司 | Repairing method of fixed tube-plate heat exchanger |
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