CN208513996U - The camshaft hole of pressurized-water reactor nuclear power plant Emergency diesel body repairs structure - Google Patents
The camshaft hole of pressurized-water reactor nuclear power plant Emergency diesel body repairs structure Download PDFInfo
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- CN208513996U CN208513996U CN201820837231.1U CN201820837231U CN208513996U CN 208513996 U CN208513996 U CN 208513996U CN 201820837231 U CN201820837231 U CN 201820837231U CN 208513996 U CN208513996 U CN 208513996U
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Abstract
The utility model belongs to internal combustion engine recovery technique field, the camshaft hole for being intended to provide a kind of pressurized-water reactor nuclear power plant Emergency diesel body repairs structure, the reparation structure to by the original camshaft hole of nuclear power Emergency diesel body be deformed and/or crackle after the first camshaft hole reparation for being formed at the second camshaft hole, in the utility model, by forming first shaft hole to the first camshaft hole reaming, metallic sheath tight fit is plugged in first shaft hole, and in the two sides of metallic sheath, installation connecting element is on the junction of metallic sheath and body to prevent metallic sheath from rotationally and axially moving, finally, reaming is carried out to be formed and comparable second camshaft hole of original camshaft hole to the sets of holes of metallic sheath, compared to existing renovation technique, the reparation structure can realize the online reparation of camshaft hole after failure, it repairs short time limit and success rate is high, it repairs Size, required precision, the intensity requirement of camshaft hole etc. after multiple easily reach design requirement.
Description
Technical field
The utility model belongs to internal combustion engine recovery technique field, is to be related to a kind of pressurized-water reactor nuclear power plant to answer more specifically
The camshaft hole of anxious diesel-engine body repairs structure.
Background technique
Body is the Key basic parts of diesel engine, and it typically is casting.Camshaft hole is important on diesel-engine body again
One of hole system is typically located at the left and right sides of body, to supporting cam wheel axis.It is well known that the structure of diesel-engine body compared with
Complexity, camshaft work inclement condition, in practical applications, camshaft bush damage the case where happen occasionally, the damage of bearing shell
It is bad that camshaft hole is be easy to cause to deform or crack.For the normal work for guaranteeing body, camshaft hole dimensional accuracy one
As require high, but the solderability of cast iron materials is poor, thus, with the method for traditional repair welding and secondary operation to camshaft hole into
The success rate that row is repaired is lower, it is easy to entire body be caused directly to scrap.
Utility model content
The purpose of this utility model is to provide a kind of camshaft hole reparations of pressurized-water reactor nuclear power plant Emergency diesel body
Structure, traditional restorative procedure reparation of the camshaft hole to solve nuclear power Emergency diesel body existing in the prior art
The lower technical problem of success rate.
In order to solve the above technical problems, the technical solution adopted in the utility model is: providing a kind of pressurized-water reactor nuclear power plant and answer
The camshaft hole of anxious diesel-engine body repairs structure, the camshaft hole reparation knot of the pressurized-water reactor nuclear power plant Emergency diesel body
Structure, to by the original camshaft hole of nuclear power Emergency diesel body be deformed and/or crackle after the first camshaft for being formed
It repairs into the second camshaft hole in hole, wherein the camshaft hole of the pressurized-water reactor nuclear power plant Emergency diesel body repairs structure packet
It includes
First shaft hole is formed by the first camshaft hole reaming；
Metallic sheath, tight fit are plugged in the first shaft hole and have sets of holes；
Connector is installed on the junction of the metallic sheath and the body, to limit the metallic sheath rotation and axis
To movement；The two sides of the metallic sheath are respectively arranged at least one described connector；
Second axis hole is second camshaft hole, is formed by the sets of holes reaming of the metallic sheath, and described second
Center line, size and the required precision of camshaft hole center line, size and the required precision with the original camshaft hole respectively
Correspondence is identical.
Preferably, the connector is junction of the edges of two sheets of paper screw.
Further, the two sides of the metallic sheath are respectively arranged 1 junction of the edges of two sheets of paper screw, and two junction of the edges of two sheets of paper screws are opposite
In the design centre of the original camshaft hole, symmetrical and intersection is tiltedly to setting.
Further, the first shaft hole is formed by first camshaft hole through the first boring cutter bore hole, and described first
The center line of axis hole and the design centre line of the original camshaft hole are located along the same line.
Further, second axis hole is formed by the sets of holes of the metallic sheath through the second boring cutter, and described second
The center line of axis hole and the design centre line of the original camshaft hole are located along the same line.
Further, first boring cutter and second boring cutter are the dedicated boring cutter of Self-aligning camshaft.
Further, the internal diameter that the internal diameter of the metallic sheath is equal to the original camshaft hole subtracts in the first shaft hole
Reserved machining allowance size, the aperture that the outer diameter of the metallic sheath is equal to the first shaft hole are matched plus interference between the two
Resultant size.
Specifically, the machining allowance is 1mm~2mm.
Further, the metallic sheath borrows thermal expansion and contraction principle and is plugged in the first shaft hole.
Further, the metallic sheath after liquid nitrogen is cooling and size is shunk is plugged in the first shaft hole.
Further, there is multiple first camshaft holes, adjacent 3 the second camshafts after reparation on the body
The concentricity in hole is less than or equal to φ 0.03mm.
Further, first camshaft hole is greater than 3, and all second camshaft holes after reparation is coaxial
Degree is less than or equal to φ 0.12mm.
Compared with prior art, the camshaft hole of pressurized-water reactor nuclear power plant Emergency diesel body provided by the utility model is repaired
The beneficial effect of complex structure is:
It includes first shaft hole, metallic sheath, company that the camshaft hole of the pressurized-water reactor nuclear power plant Emergency diesel body, which repairs structure,
Fitting and the second axis hole, wherein first shaft hole by original camshaft hole be deformed and/or crackle after the first camshaft for being formed
Hole reaming forms, by the way that metallic sheath tight fit is plugged in first shaft hole, and in the two sides of metallic sheath, in metallic sheath and body
At least one connector is installed to prevent metallic sheath from rotationally and axially moving on junction, finally, the sets of holes to metallic sheath carry out
Reaming is to form the second axis hole, because the center line of the second axis hole, size and required precision etc. are corresponding with original camshaft hole
It is identical, and intensity needed for body after the synchronous guarantee failure of metallic sheath, therefore, the second axis hole for repairing formation can quite original cam
Axis hole, it is clear that the online reparation of the camshaft hole after failure may be implemented in the reparation structure, it is high to repair success rate, and after reparation
Size, required precision, the intensity requirement of camshaft hole etc. easily reach design requirement, can ensure that the camshaft hole after repairing just
Often work operation.
Detailed description of the invention
It, below will be to embodiment or the prior art in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing needed in description is briefly described, it should be apparent that, the accompanying drawings in the following description is only that this is practical new
Some embodiments of type for those of ordinary skill in the art without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is that the camshaft hole of pressurized-water reactor nuclear power plant Emergency diesel body in the utility model embodiment repairs structure
Schematic diagram of internal structure；
Fig. 2 is the partial enlarged view in Fig. 1 at A.
Wherein, the label in attached drawing is as follows:
10- body, 20- center line；
100- first shaft hole, the second axis hole of 200-/the second camshaft hole, 300- metallic sheath, 400- connector/junction of the edges of two sheets of paper spiral shell
Nail.
Specific embodiment
For technical problem to be solved in the utility model, technical solution and beneficial effect is more clearly understood, below
In conjunction with specific drawings and the specific embodiments, further elaborate to the utility model.Wherein, the utility model is embodied
The same or similar label indicates the same or similar element or element with the same or similar functions in the attached drawing of example.
It should be understood that ground, specific embodiment disclosed below are intended for explaining the utility model, it is not used to limit originally practical new
Type.
It should be noted that when element is referred to as " being fixed on " or " being installed on " or " being set to " or " being connected to " another element
On, it, which can be, is directly or indirectly located on another element.For example, when an element referred to as " is connected to " another yuan
On part, it, which can be, is directly or indirectly connected on another element.Term " length ", " width ", "upper", "lower", " left side ",
The orientation or position of the instructions such as " right side ", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outside" are based on attached drawing
Shown in orientation or position, be only easy for describing, should not be understood as the limitation to the technical program.
In addition, term " first ", " second " only for ease of description, be not understood to indicate or imply relative importance or
Person implicitly indicates the quantity of technical characteristic.The meaning of " plurality " is two or more, unless otherwise specifically defined.
In short, for the ordinary skill in the art, can understand the concrete meaning of above-mentioned term as the case may be.
Below in conjunction with attached drawing 1 and Fig. 2 to a kind of pressurized-water reactor nuclear power plant Emergency diesel body provided by the utility model
The realization that camshaft hole repairs structure is described in detail.
It should be noted that the camshaft hole of the pressurized-water reactor nuclear power plant Emergency diesel body repairs structure, mainly to incite somebody to action
First camshaft hole (not shown) reparation of nuclear power Emergency diesel body 10 is at the second camshaft hole 200.It is to be appreciated that the
One camshaft hole be original camshaft hole (not shown) be deformed and/or crackle after the camshaft hole that is formed, the second cam
Axis hole 200 is the camshaft hole after repairing successfully, that is, the second camshaft hole 200 is equivalent to original camshaft hole.Certainly,
In fact, the reparation structure is not limited only to repair the camshaft hole of nuclear power Emergency diesel body 10, it may also be used for repair nuclear power
The other suitable components of oil-burning machine body 10 or position etc..
As shown in Figure 1, the camshaft hole of the pressurized-water reactor nuclear power plant Emergency diesel body repairs structure, including first shaft hole
100, metallic sheath 300, connector 400 and the second axis hole 200.Wherein, first shaft hole 100 is formed by the first camshaft hole reaming.
It is to be appreciated that the aperture of first shaft hole 100 is greater than the aperture of original camshaft hole.Machine can be greatly reduced in view of reaming is too deep
The intensity of 10 base material of body, reaming shallowly not can guarantee the reinforcement strength of metallic sheath 300 then excessively, and can not thoroughly eliminate deformation and/or
Crackle, thus, specific reaming scheme, such as the depth and length of reaming should be according to (i.e. the first cams of camshaft hole after failure
Axis hole) surplus size, metallic sheath size and determine situations such as crack depth.
As shown in Figure 1, metallic sheath 300 has sets of holes (not shown) and tight fit is plugged in first shaft hole 100, in this way,
Metallic sheath 300 can be fixed on body 10.In addition, rotationally and axially moving for limitation metallic sheath 300, guarantee to repair structure
Stability, connector 400 is installed on the junction of metallic sheath 300 and body 10, and is respectively arranged in the two sides of metallic sheath 300
There is at least one connector 400.
In addition, the second axis hole 200 is formed by the sets of holes (not shown) reaming of metallic sheath 300, it is possible to understand that ground is finally expanded
Second axis hole 200 made of hole is the second camshaft hole.Specifically, center line 20, size and the essence of the second camshaft hole 200
Degree requires corresponding identical as the center line 20 of original camshaft hole, size and required precision respectively.In other words, the second axis hole
200 aperture, concentricity etc. are able to satisfy the design requirement of original camshaft hole, the second axis hole 200 (namely second camshaft hole)
Original camshaft hole can be substituted completely to work on.
Generally, the camshaft hole of the pressurized-water reactor nuclear power plant Emergency diesel body repairs structure, using " reaming+grafting
The recovery scenario of metallic sheath " repairs the camshaft hole for having deformation and/or crackle, compared to traditional repair welding, is not necessarily to
By the solderability of body casting, but directly reaming processing and metal reinforcement twice technique are combined together, repair the duration
Shorter and reparation success rate is higher, and dimensional tolerance, geometric tolerance of the camshaft hole after reparation etc. are all satisfied design requirement, and repair
The intensity of camshaft hole after multiple is also able to satisfy normal operation and requires.
Further, the camshaft hole reparation as pressurized-water reactor nuclear power plant Emergency diesel body provided by the utility model
A kind of specific embodiment of structure, to ensure to repair the stability of structure, reduction metallic sheath 300 rotationally and axially moves several
Rate, connector 400 are preferably junction of the edges of two sheets of paper screw.It should be noted that as depicted in figs. 1 and 2, compared to common screw, when installation, ride
It stitches contact line of the center line of screw 400 just between body 10 and metallic sheath 300 to be located along the same line, preferably with this
Ensure that the connection between body 10 and metallic sheath 300 is stronger.
As shown in Figure 1, specifically in the present embodiment, the two sides of metallic sheath 300 are respectively arranged 1 junction of the edges of two sheets of paper screw 400, and two
Junction of the edges of two sheets of paper screw 400 is symmetrical relative to the design centre of original camshaft hole and intersects tiltedly to setting.Specifically, it is shown with Fig. 1
Example, a junction of the edges of two sheets of paper screw 400 are located at the upside of center line 20 and by the left side (being equivalent in fourth quadrant), another junction of the edges of two sheets of paper screws
400 are located at the downside of center line 20 and lean on the right (being equivalent in the second quadrant).It should be noted that in general, each junction of the edges of two sheets of paper spiral shell
The size of nail 400 is determined by the thickness of metallic sheath 300.
Further, the camshaft hole reparation as pressurized-water reactor nuclear power plant Emergency diesel body provided by the utility model
A kind of specific embodiment of structure, first shaft hole 100 is by the first camshaft hole (not shown) through the first boring cutter (not shown) boring
Hole forms, and the center line 20 of first shaft hole 100 and the design centre line 20 of original camshaft hole are located along the same line.This
Sample can guarantee the concentricity of the first shaft hole 100 and original camshaft hole that expand when expanding the internal diameter of camshaft hole.By
Limited in the structural particularity of camshaft, and live processing space, specifically in the present embodiment, the first boring cutter is self-regulated cardiac prominence
The dedicated boring cutter of wheel shaft.
Further, the camshaft hole reparation as pressurized-water reactor nuclear power plant Emergency diesel body provided by the utility model
A kind of specific embodiment of structure, accordingly, the second axis hole 200 is by the sets of holes (not shown) of metallic sheath 300 through the second boring cutter
(not shown) forms, and the design centre line 20 of the center line 20 of the second axis hole 200 and original camshaft hole is located at same straight line
On.In this way, can guarantee the concentricity of the second axis hole 200 and original camshaft hole expanded, and this when expanding sets of holes aperture
The concentricity accumulated error that operation generates before the boring process at place can be eliminated and be compensated.Specifically in the present embodiment, second
Boring cutter is also the dedicated boring cutter of Self-aligning camshaft, and to simplify the production of cutter, in general, the second boring cutter and the first boring cutter can be
It is same boring cutter.
Further, the camshaft hole reparation as pressurized-water reactor nuclear power plant Emergency diesel body provided by the utility model
The outer diameter D of a kind of specific embodiment of structure, metallic sheath 300 is greater than or equal to (being actually slightly over) first shaft hole 100
Aperture, specifically, the aperture that the outer diameter D of metallic sheath 300 is equal to first shaft hole 100 are big plus value of interference fit between the two
It is small.Accordingly, the internal diameter d (i.e. the original apertures of sets of holes) of metallic sheath 300 is less than or equal to (practical is to be slightly less than) original cam
The design aperture of axis hole, specifically, the internal diameter that the internal diameter d of metallic sheath 300 is equal to original camshaft hole subtract in first shaft hole 100
Reserved machining allowance size.
It should be noted that machining allowance, metallic sheath that the aperture of specific first shaft hole 100,300 sets of holes of metallic sheath are reserved
300 thickness etc. should all be determined according to diesel engine model.Specifically in the present embodiment, axle sleeve rear axle is installed to eliminate or adjusting
Set deforms, to ensure the concentricity of sets of holes Yu original camshaft hole, it is preferable that the reserved processing of 300 sets of holes of metallic sheath
Surplus is 1mm~2mm.
Further, the camshaft hole reparation as pressurized-water reactor nuclear power plant Emergency diesel body provided by the utility model
A kind of specific embodiment of structure, to guarantee the reliability and success rate repaired, metallic sheath 300 borrows thermal expansion and contraction principle and inserts
It is connected in first shaft hole 100.Because the area in view of camshaft hole is big, cast iron deflection is small, it is preferable that and ruler cooling through liquid nitrogen
It is very little shunk after metallic sheath 300 be plugged in first shaft hole 100.That is, metallic sheath 300 is by way of the cold set of liquid nitrogen
It is plugged in first shaft hole 100.
Further, the camshaft hole reparation as pressurized-water reactor nuclear power plant Emergency diesel body provided by the utility model
A kind of specific embodiment of structure has multiple first camshaft hole (not shown) on body 10, it is possible to understand that ground, body 10
It is upper that there are multiple original camshaft holes, when have it is multiple break down especially more than 3 camshaft holes when, in repair process,
It is necessary to ensure that the concentricity of adjacent 3 the second camshaft holes 200 after repairing is less than or equal to φ 0.03mm.
In addition to this, the first camshaft hole is greater than 3, that is, when more than 3 camshaft holes break down, repair process
In, for the normal operation for ensuring camshaft hole, also need the concentricity of all second camshaft holes 200 after guaranteeing to repair be less than or
Equal to φ 0.12mm.
From the foregoing, it will be observed that generally, the camshaft hole of the pressurized-water reactor nuclear power plant Emergency diesel body repairs the reparation of structure
Principle are as follows: first to the camshaft hole reaming of failure, then metallic sheath 300 is socketed in the first shaft hole 100 expanded, on the one hand
Reinforce the intensity of body 10, on the other hand borrows the sets of holes of metallic sheath 300 to substitute the camshaft hole of failure, finally, to metal
The sets of holes reaming of set 300 can be equal to original camshaft hole with the second axis hole 200 for ensuring to expand, and then substitute original camshaft
Hole, it is ensured that the normal operation of camshaft hole achievees the effect that reparation.
Accordingly, for being repaired to UD45V12S6 diesel engine, wherein 10 a total of 7 originals of body to be repaired
Beginning camshaft hole, the aperture of original camshaft hole are 110mm H7.Using the convex of the pressurized-water reactor nuclear power plant Emergency diesel body
It is as follows that axle hole repairs the key step that structure is repaired:
(1) using the first boring cutter to deforming and/or having the camshaft hole of crackle to carry out bore hole, specifically, boring depth is
5mm, bore hole to 120mm；
(2) selecting internal diameter is 107mm, and outer diameter is the metallic sheath 300 of 120.06mm~120.08mm；
(3) metallic sheath 300 is placed in liquid nitrogen plan, makes its rapid cooling, be in and shrink in the outer diameter of metallic sheath 300
When state, in the camshaft hole (namely first shaft hole 100) after metallic sheath 300 to be mounted on to rapidly bore hole, to ensure metallic sheath
300 tight fits are plugged in first shaft hole 100；
(4) in the two sides of metallic sheath 300, and 1 connecting hole is opened up respectively in the junction of metallic sheath 300 and body 10,
M6 junction of the edges of two sheets of paper screw 400 is installed in corresponding connecting hole, to reinforce the connection of metallic sheath 300 and body 10, prevents metallic sheath
300 rotationally and axially move；
(5) sets of holes (i.e. the second axis using the second boring cutter by the sets of holes bore hole of metallic sheath 300 to 110mm H7, after bore hole
Hole 200) design requirement that meets original camshaft hole, such as aperture (110mm H7), concentricity (adjacent 3 holes concentricity≤φ
0.03mm), 7 hole concentricity≤φ 0.12mm of overall length etc..
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model.For this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model
Within, any modification, equivalent replacement, improvement and so on should be included within the scope of the claims of the utility model.
Claims (12)
1. the camshaft hole of pressurized-water reactor nuclear power plant Emergency diesel body repairs structure, to by nuclear power Emergency diesel body
Original camshaft hole be deformed and/or crackle after the first camshaft hole reparation for being formed at the second camshaft hole, feature exists
In the camshaft hole of the pressurized-water reactor nuclear power plant Emergency diesel body repairs structure and includes
First shaft hole is formed by the first camshaft hole reaming；
Metallic sheath, tight fit are plugged in the first shaft hole and have sets of holes；
Connector is installed on the junction of the metallic sheath and the body, rotationally and axially moves to limit the metallic sheath
It is dynamic；The two sides of the metallic sheath are respectively arranged at least one described connector；
Second axis hole is second camshaft hole, is formed by the sets of holes reaming of the metallic sheath, and second cam
Center line, size and the required precision of axis hole are corresponding with the center line of the original camshaft hole, size and required precision respectively
It is identical.
2. the camshaft hole of pressurized-water reactor nuclear power plant Emergency diesel body according to claim 1 repairs structure, feature
It is, the connector is junction of the edges of two sheets of paper screw.
3. the camshaft hole of pressurized-water reactor nuclear power plant Emergency diesel body according to claim 2 repairs structure, feature
It is, the two sides of the metallic sheath are respectively arranged 1 junction of the edges of two sheets of paper screw, and two junction of the edges of two sheets of paper screws are relative to described original convex
The design centre of axle hole is symmetrical and intersects tiltedly to setting.
4. the camshaft hole of pressurized-water reactor nuclear power plant Emergency diesel body according to claim 1 repairs structure, feature
It is, the first shaft hole is formed by first camshaft hole through the first boring cutter bore hole, and the center line of the first shaft hole
It is located along the same line with the design centre line of the original camshaft hole.
5. the camshaft hole of pressurized-water reactor nuclear power plant Emergency diesel body according to claim 4 repairs structure, feature
It is, second axis hole is formed by the sets of holes of the metallic sheath through the second boring cutter, and the center line of second axis hole
It is located along the same line with the design centre line of the original camshaft hole.
6. the camshaft hole of pressurized-water reactor nuclear power plant Emergency diesel body according to claim 5 repairs structure, feature
It is, first boring cutter and second boring cutter are the dedicated boring cutter of Self-aligning camshaft.
7. the camshaft hole of pressurized-water reactor nuclear power plant Emergency diesel body according to claim 1 repairs structure, feature
It is, the internal diameter that the internal diameter of the metallic sheath is equal to the original camshaft hole subtracts more than the processing reserved in the first shaft hole
Size is measured, the outer diameter of the metallic sheath is equal to the aperture of the first shaft hole plus value of interference fit size between the two.
8. the camshaft hole of pressurized-water reactor nuclear power plant Emergency diesel body according to claim 7 repairs structure, feature
It is, the machining allowance is 1mm~2mm.
9. the camshaft hole of pressurized-water reactor nuclear power plant Emergency diesel body according to claim 1 repairs structure, feature
It is, the metallic sheath borrows thermal expansion and contraction principle and is plugged in the first shaft hole.
10. the camshaft hole of pressurized-water reactor nuclear power plant Emergency diesel body according to claim 9 repairs structure, feature
It is, the metallic sheath after liquid nitrogen is cooling and size is shunk is plugged in the first shaft hole.
11. the camshaft hole reparation of the pressurized-water reactor nuclear power plant Emergency diesel body according to any of claims 1 to 10
Structure, which is characterized in that there is multiple first camshaft holes, adjacent 3 the second camshafts after reparation on the body
The concentricity in hole is less than or equal to φ 0.03mm.
12. the camshaft hole of pressurized-water reactor nuclear power plant Emergency diesel body according to claim 11 repairs structure, special
Sign is that first camshaft hole is greater than 3, and the concentricity of all second camshaft holes after reparation is less than or waits
In φ 0.12mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820837231.1U CN208513996U (en) | 2018-05-31 | 2018-05-31 | The camshaft hole of pressurized-water reactor nuclear power plant Emergency diesel body repairs structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820837231.1U CN208513996U (en) | 2018-05-31 | 2018-05-31 | The camshaft hole of pressurized-water reactor nuclear power plant Emergency diesel body repairs structure |
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| CN208513996U true CN208513996U (en) | 2019-02-19 |
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ID=65340625
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114643453A (en) * | 2020-12-17 | 2022-06-21 | 国家电投集团黄河上游水电开发有限责任公司 | Repairing method suitable for deformation of anode guide rod lifting hole |
-
2018
- 2018-05-31 CN CN201820837231.1U patent/CN208513996U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114643453A (en) * | 2020-12-17 | 2022-06-21 | 国家电投集团黄河上游水电开发有限责任公司 | Repairing method suitable for deformation of anode guide rod lifting hole |
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