CN114833730A - Sand blasting device and method for zirconium alloy pipe - Google Patents

Sand blasting device and method for zirconium alloy pipe Download PDF

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Publication number
CN114833730A
CN114833730A CN202210451357.6A CN202210451357A CN114833730A CN 114833730 A CN114833730 A CN 114833730A CN 202210451357 A CN202210451357 A CN 202210451357A CN 114833730 A CN114833730 A CN 114833730A
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CN
China
Prior art keywords
zirconium alloy
pipe
treated
alloy pipe
sand blasting
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Granted
Application number
CN202210451357.6A
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Chinese (zh)
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CN114833730B (en
Inventor
贺飞
薛艳丽
顾捷
徐以轩
张宗传
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State Nuclear Bao Ti Zirconium Industry Co
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State Nuclear Bao Ti Zirconium Industry Co
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Publication of CN114833730A publication Critical patent/CN114833730A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/32—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks
    • B24C3/325—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks for internal surfaces, e.g. of tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C5/00—Devices or accessories for generating abrasive blasts
    • B24C5/02—Blast guns, e.g. for generating high velocity abrasive fluid jets for cutting materials
    • B24C5/04—Nozzles therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Abstract

The invention relates to a sand blasting device and a method for zirconium alloy pipes, wherein the device comprises: a nozzle; the guide sleeve is fixedly arranged at the nozzle opening and is concentric with the nozzle opening; the connecting pipe is partially inserted into the guide sleeve and is detachably connected with the guide sleeve; the polyurethane sleeve is partially sleeved on the outer surface of the end part of the connecting pipe and is detachably connected with the connecting pipe; the zirconium alloy pipe to be treated is partially inserted into the polyurethane sleeve and is detachably connected with the polyurethane sleeve; the invention provides a sand blasting device and method for a zirconium alloy pipe. The invention has no blind area in the sand blasting process, can finish the sand blasting operation at one time, improves the operation efficiency, has consistent sand blasting degree on the inner surface of the zirconium alloy pipe to be treated and high sand blasting quality. The technical problems of low sand blasting quality and inconsistent sand blasting degree of the inner surface of the zirconium alloy pipe for the nuclear in the prior art are solved.

Description

Sand blasting device and method for zirconium alloy pipe
Technical Field
The invention relates to the technical field of sand blasting processes of zirconium alloy pipes, in particular to a sand blasting device and method for zirconium alloy pipes.
Background
The surface quality of the zirconium alloy pipe for the nuclear power plant is related to the operation safety of the nuclear power plant, and the defects of dirt, adhesion, microcrack and the like on the inner surface of the pipe are eliminated by adopting a mode of sand blasting at two ends in the conventional zirconium alloy pipe inner surface treatment process, wherein a non-fuel pipe is subjected to sand blasting after being cut into a certain size. Because nozzle sand outlet hole diameter is far less than the tubular product internal diameter, the grit must just begin to contact and rub the tubular product internal surface through certain distance scattering during the sandblast, and the grit begins to contact the distance of tubular product internal surface position to pipe end, is called sandblast "blind area", and length is about 5 mm. Therefore, at present, in order to eliminate the adverse effect of the blind area, the pipe is generally turned around for sand blasting, and the blind area can be subjected to grit friction when the pipe is turned around for sand blasting, but the method has the defects that the blind area is far away from the nozzle, the grit speed is reduced, the removal capacity of dirt, defects and the like is obviously reduced, the sand blasting effect is poor, and after the pipe is subjected to sand blasting twice, the two ends of the inner surface are both frosted by one section, the degree of sanding is weaker than that of the middle part of the pipe, the sand blasting on the inner surface of the pipe is inconsistent, and the operation safety of a nuclear power station can be influenced in the using process.
Therefore, how to improve the sand blasting quality of the inner surface of the zirconium alloy pipe for the nuclear, and remove the adverse effect of the blind zone, so that the sand blasting degree of the inner surface of the zirconium alloy pipe is consistent and the working efficiency is low.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a sand blasting device and method for a zirconium alloy pipe, which can improve the sand blasting quality of the inner surface of the zirconium alloy pipe for nuclear use, so that the sand blasting degree of the inner surface of the zirconium alloy pipe is consistent, and the operation efficiency is high.
According to a first aspect of the present invention, there is provided a blasting apparatus for a zirconium alloy pipe, comprising: a nozzle having a nozzle opening for ejecting high-speed gravel; the guide sleeve is fixedly arranged at the nozzle opening and is concentric with the nozzle opening; the connecting pipe is partially inserted into the guide sleeve and is detachably connected with the guide sleeve; the polyurethane sleeve is partially sleeved on the outer surface of the end part of the connecting pipe and is detachably connected with the connecting pipe; the zirconium alloy pipe to be treated is partially inserted into the polyurethane sleeve and is detachably connected with the polyurethane sleeve; wherein, the zirconium alloy pipe to be treated, which is partially inserted into the polyurethane sleeve, is tightly contacted with the end part of the connecting pipe; and the high-speed gravel sprayed out of the nozzle enters the zirconium alloy pipe to be treated through the connecting pipe, and the inner surface of the zirconium alloy pipe to be treated is subjected to sand blasting operation, wherein the connecting pipe and the zirconium alloy pipe to be treated have the same shape and size.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, still include: the gasket is provided with a through hole and is arranged in the guide sleeve, and the connecting pipe is tightly contacted with the gasket; the size of the through hole is not smaller than the size of the nozzle opening.
Further, the connecting pipe and the zirconium alloy pipe to be treated are inserted into the polyurethane sleeve in the same length.
Furthermore, the connecting pipe and the zirconium alloy pipe to be treated are tightly connected with the polyurethane sleeve, and have no relative displacement.
Further, the connecting pipe is tightly connected with the guide sleeve and does not have relative displacement.
Further, the length of the connecting pipe is 50-80 mm.
Furthermore, the inner surfaces of the guide sleeve and the polyurethane sleeve are cylindrical surfaces; the connecting pipe and the zirconium alloy pipe are both round pipes.
According to another aspect of the present invention, there is provided a method of blasting a zirconium alloy pipe, the method comprising: inserting two ends of the connecting pipe into the guide sleeve and the polyurethane sleeve respectively, wherein the polyurethane sleeve is partially sleeved on the outer surface of the connecting pipe; inserting a first end of a zirconium alloy pipe to be treated into the polyurethane sleeve, and tightly contacting the first end with the connecting pipe; and the gravel sprayed from the nozzle enters the zirconium alloy pipe to be treated through the connecting pipe, and the sand blasting operation is carried out on the inner surface of the zirconium alloy pipe to be treated.
Furthermore, after the gravel sprayed from the nozzle enters the zirconium alloy pipe to be treated through the connecting pipe, the method also comprises the following steps of: and inserting the second end of the zirconium alloy pipe to be treated into the polyurethane sleeve, and performing sand blasting operation on the inner surface of the zirconium alloy pipe to be treated.
The invention provides a sand blasting device and a method for a zirconium alloy pipe, wherein the device comprises: a nozzle having a nozzle opening for ejecting high-speed gravel; the guide sleeve is fixedly arranged at the nozzle opening and is concentric with the nozzle opening; the connecting pipe is partially inserted into the guide sleeve and is detachably connected with the guide sleeve; the polyurethane sleeve is partially sleeved on the outer surface of the end part of the connecting pipe and is detachably connected with the connecting pipe; the zirconium alloy pipe to be treated is partially inserted into the polyurethane sleeve and is detachably connected with the polyurethane sleeve; wherein, the zirconium alloy pipe to be treated, which is partially inserted into the polyurethane sleeve, is tightly contacted with the end part of the connecting pipe; and the high-speed gravel sprayed out of the nozzle enters the zirconium alloy pipe to be treated through the connecting pipe, and the sand blasting operation is carried out on the inner surface of the zirconium alloy pipe to be treated. The invention has no blind area in the sand blasting process, can complete the sand blasting operation at one time, improves the operation efficiency, and has consistent sand blasting degree of the inner surface of the zirconium alloy pipe to be treated and high sand blasting quality. The problem of among the prior art, to zirconium alloy intraductal surface sandblast have the blind area, the blind area position is far away from nozzle distance, the grit speed descends, obviously descends to the ability of getting rid of dirty, defect etc. and must turn round zirconium alloy pipe and carry out secondary sandblast, but tubular product is through twice sandblast back, and one section dull polish degree can all appear in the both ends of internal surface and is less than the region in tubular product middle part, causes the non-uniform and low technical problem of operating efficiency of tubular product internal surface sandblast.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic cross-sectional view of an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a blasting method according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a blasting method according to another embodiment of the invention.
In the drawings, the components represented by the respective reference numerals are listed below:
the device comprises a zirconium alloy pipe-1 to be treated, a guide sleeve-2, a gasket-3, a nozzle-4, gravel-5, a connecting pipe-6 and a polyurethane sleeve-7.
Detailed Description
In order to make the aforementioned and other features and advantages of the invention more apparent, the invention is further described below with reference to the accompanying drawings. It is understood that the specific embodiments described herein are for purposes of illustration only and are not intended to be limiting, as those of ordinary skill in the art will recognize.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that the specific details need not be employed to practice the present invention. In other instances, well-known steps or operations are not described in detail to avoid obscuring the invention.
In the prior art, the inner surface treatment process of the zirconium alloy pipe adopts a mode of sand blasting at two ends to eliminate the defects of dirt, adhesion, microcrack and the like on the inner surface of the pipe. Because of there is the blind area among the sandblast process, must turn round zirconium alloy pipe and carry out the secondary sandblast, but tubular product is through twice sandblast back, and one section dull polish degree can all appear at the both ends of internal surface and be less than the region in tubular product middle part, causes the interior surface sandblast inconsistent degree of tubular product. Therefore, the invention provides a sand blasting device and method for a zirconium alloy pipe, which are used for solving the technical problems of low sand blasting quality and inconsistent sand blasting degree of the inner surface of the zirconium alloy pipe for the nuclear at present.
Example one
The invention provides a sand blasting device for zirconium alloy pipes, as shown in figure 1, comprising: the device comprises a nozzle 4, a guide sleeve 2, a connecting pipe 6, a polyurethane sleeve 7 and a zirconium alloy pipe 1 to be treated. The nozzle 4 is provided with a nozzle 4 opening for ejecting high-speed gravel 5; the guide sleeve 2 is fixedly arranged at the opening of the nozzle 4 and is concentric with the opening of the nozzle 4; the connecting pipe 6 is partially inserted into the guide sleeve 2 and is detachably connected with the guide sleeve 2; the polyurethane sleeve 7 is partially sleeved on the outer surface of the end part of the connecting pipe 6 and is detachably connected with the connecting pipe 6; the zirconium alloy pipe 1 to be treated is partially inserted into the polyurethane sleeve 7 and is detachably connected with the polyurethane sleeve 7; preferably, the zirconium alloy pipe 1 to be treated partially inserted into the polyurethane cover 7 is in close contact with the end of the connection pipe 6 in order to cause the high-speed grits 5 to rub only in the connection pipe 6 and the zirconium alloy pipe with treatment, without impacting the inner wall of the polyurethane cover 7, causing damage to the polyurethane cover 7.
In a specific embodiment, the high-speed grits 5 sprayed from the nozzle 4 enter the zirconium alloy pipe 1 to be treated through the connecting pipe 6, and sand blasting operation is performed on the inner surface of the zirconium alloy pipe 1 to be treated, so that the defects of dirt, adhesion, microcracks and the like on the inner surface of the pipe are eliminated, wherein the connecting pipe 6 and the zirconium alloy pipe 1 to be treated can be identical in shape and size. It should be noted that the shape of the connecting pipe 6 and the zirconium alloy pipe 1 to be treated may be a circular pipe, a square pipe or other shape pipes, and it is only necessary that the structures in the connecting pipe 6, the zirconium alloy pipe 1 to be treated, the guide sleeve 2 and the polyurethane sleeve 7 are consistent. In another preferred embodiment, the external shape of the connecting pipe 6 and the zirconium alloy pipe 1 to be treated can be different, but the internal wall structure, shape and size of the connecting pipe 6 and the zirconium alloy pipe 1 to be treated are consistent, and obviously, the internal structure, shape and size of the guide sleeve 2 and the polyurethane sleeve 7 connected with the connecting pipe 6 and the zirconium alloy pipe 1 to be treated are consistent with the external surface structure, shape and size of the connecting pipe 6 and the zirconium alloy pipe 1 to be treated.
Compared with the prior art, the scheme has the advantages that the blind area does not exist in the sand blasting process, the sand blasting operation can be completed at one time, the operation efficiency is high, the sand blasting degree of the inner surface of the zirconium alloy pipe 1 to be treated is consistent, and the sand blasting quality is high.
Preferably, the sand blasting device for the zirconium alloy pipe further comprises: and a gasket 3 for sealing the nozzle 4 and the connection pipe 6. Specifically, the gasket 3 is provided with a through hole and is arranged in the guide sleeve 2, wherein the connecting pipe 6 is tightly contacted with the gasket 3; the size of the through hole is not smaller than the size of the nozzle 4 opening. Specifically, one end of the guide sleeve 2 can be provided with a check ring, the check ring is fixedly arranged on the inner wall of the guide sleeve 2 and is perpendicular to the central line of the guide sleeve 2, the gasket 3 is in contact connection with the check ring, the connecting pipe 6 is tightly pressed on the gasket 3, and the gasket 3 is in close contact with the check ring and used for sealing the nozzle 4.
Preferably, the connecting pipe 6 is the same length as the zirconium alloy pipe 1 to be treated inserted into the polyurethane sleeve 7. The connecting pipe 6 and the zirconium alloy pipe 1 to be treated are both tightly connected with the polyurethane sleeve 7 and have no relative displacement; the connecting pipe 6 is tightly connected with the guide sleeve 2 and has no relative displacement. Specifically, the connecting pipe 6 can be made of the zirconium alloy pipe 1 to be treated, and because the zirconium alloy pipe 1 to be treated needs to be cut into a certain size and then subjected to sand blasting, the connecting pipe 6 can be made of a stub bar formed by cutting the zirconium alloy pipe into sections, wherein the length of the connecting pipe 6 is preferably cut into 50-80 mm. In an alternative embodiment, the connecting tube 6 and the zirconium alloy tube are both round tubes; the inner surfaces of the guide sleeve 2 and the polyurethane sleeve 7 are cylindrical surfaces and correspond to the connecting pipe 6 and the zirconium alloy pipe.
Example two
The invention also provides a sand blasting method for the zirconium alloy pipe, as shown in figures 2-3, the method comprises the following steps:
and S101, respectively inserting two ends of the connecting pipe into the guide sleeve and the polyurethane sleeve, wherein the polyurethane sleeve is partially sleeved on the outer surface of the connecting pipe.
And S102, inserting the first end of the zirconium alloy pipe to be treated into the polyurethane sleeve, and tightly contacting the first end with the connecting pipe.
And step S103, enabling the gravel sprayed out of the nozzle to enter the zirconium alloy pipe to be treated through the connecting pipe, and performing sand blasting operation on the inner surface of the zirconium alloy pipe to be treated.
Because the grit that the nozzle spun gets into in the zirconium alloy pipe of treating through the connecting pipe, there is not the blind area between nozzle and the zirconium alloy pipe of treating, consequently, zirconium alloy pipe internal surface sandblast quality is high in the sandblast in-process to sandblast degree uniformity is good.
Preferably, in step S101, the two ends of the connection tube are respectively inserted into the guide sleeve and the polyurethane sleeve, wherein before the polyurethane sleeve is partially sleeved on the outer surface of the connection tube, the method may further include:
and S100, placing the gasket into the sleeve, and connecting the gasket with the guide sleeve in a contact manner.
Preferably, in step S103, the method further includes the step of injecting gravel into the zirconium alloy pipe to be treated through the connecting pipe, and after performing sand blasting operation on the inner surface of the zirconium alloy pipe to be treated:
and step S104, inserting the second end of the zirconium alloy pipe to be treated into the polyurethane sleeve, and performing sand blasting operation on the inner surface of the zirconium alloy pipe to be treated.
Specifically, two ends of the zirconium alloy pipe to be treated are exchanged, secondary sand blasting is carried out, and the sand blasting effect on the inner surface of the zirconium alloy pipe to be treated is improved.
The invention has no blind area in the sand blasting process, can finish the sand blasting operation at one time, improves the operation efficiency, has consistent sand blasting degree on the inner surface of the zirconium alloy pipe to be treated and high sand blasting quality.
The respective technical features described above may be arbitrarily combined. Although not all possible combinations of features are described, any combination of features should be considered to be covered by the present specification as long as there is no contradiction between such combinations.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.

Claims (9)

1. A sand blasting unit for zirconium alloy tubular product, characterized by comprising:
a nozzle having a nozzle opening for ejecting high-speed gravel;
the guide sleeve is fixedly arranged at the nozzle opening and is concentric with the nozzle opening;
the connecting pipe is partially inserted into the guide sleeve and is detachably connected with the guide sleeve;
the polyurethane sleeve is partially sleeved on the outer surface of the end part of the connecting pipe and is detachably connected with the connecting pipe;
the zirconium alloy pipe to be treated is partially inserted into the polyurethane sleeve and is detachably connected with the polyurethane sleeve; wherein the zirconium alloy pipe to be treated partially inserted into the polyurethane sleeve is in close contact with the end of the connecting pipe;
and the high-speed gravel sprayed out of the nozzle enters the zirconium alloy pipe to be treated through the connecting pipe, and the inner surface of the zirconium alloy pipe to be treated is subjected to sand blasting operation, wherein the connecting pipe and the zirconium alloy pipe to be treated have the same shape and size.
2. The apparatus of claim 1, further comprising:
a gasket having a through hole and disposed in the guide sleeve, wherein the connection pipe is in close contact with the gasket; the size of the through hole is not smaller than that of the nozzle opening.
3. The apparatus according to claim 1, wherein the connecting tube is the same length as the zirconium alloy tube to be treated inserted into the polyurethane sleeve.
4. The apparatus according to claim 1, wherein the connecting tube and the zirconium alloy tube to be treated are both tightly connected with the polyurethane sleeve without relative displacement.
5. The device as claimed in claim 1, wherein the connecting tube is tightly connected with the guide sleeve without relative displacement.
6. The device of claim 1, wherein the length of the connecting tube is 50-80 mm.
7. The device of claim 1, wherein the inner surfaces of the guide sleeve and the polyurethane sleeve are both cylindrical surfaces; the connecting pipe and the zirconium alloy pipe are both round pipes.
8. A method of grit blasting a zirconium alloy pipe, the method comprising:
inserting two ends of a connecting pipe into the guide sleeve and the polyurethane sleeve respectively, wherein the polyurethane sleeve is partially sleeved on the outer surface of the connecting pipe;
inserting a first end of a zirconium alloy pipe to be treated into the polyurethane sleeve, and tightly contacting the first end of the zirconium alloy pipe with the connecting pipe;
and gravel sprayed out of the nozzle enters the zirconium alloy pipe to be treated through the connecting pipe, and the inner surface of the zirconium alloy pipe to be treated is subjected to sand blasting operation.
9. The method according to claim 8, wherein after the grit sprayed from the nozzle passes through the connecting pipe and enters the zirconium alloy pipe to be treated, the inner surface of the zirconium alloy pipe to be treated is subjected to a sand blasting operation, the method further comprises:
and inserting the second end of the zirconium alloy pipe to be treated into the polyurethane sleeve, and performing sand blasting operation on the inner surface of the zirconium alloy pipe to be treated.
CN202210451357.6A 2022-04-24 2022-04-24 Sand blasting device and method for zirconium alloy pipe Active CN114833730B (en)

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CN202210451357.6A CN114833730B (en) 2022-04-24 2022-04-24 Sand blasting device and method for zirconium alloy pipe

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CN114833730B CN114833730B (en) 2023-10-10

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020182438A1 (en) * 2001-05-28 2002-12-05 Kazuya Wakita Power transmission shaft
US20120064806A1 (en) * 2010-09-09 2012-03-15 Cooper Randall J System for dispensing abrasives into a gas stream for cleaning pipe interiors
CN211136813U (en) * 2019-09-29 2020-07-31 上海图博可特石油管道涂层有限公司 Flexible sand blasting pipe nozzle
CN112718735A (en) * 2020-12-14 2021-04-30 西部新锆核材料科技有限公司 Method for cleaning inner surface of zirconium alloy pipe
CN113400200A (en) * 2021-07-01 2021-09-17 大连船用柴油机有限公司 Rust removal coating process in triangular box of low-speed marine diesel engine frame

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020182438A1 (en) * 2001-05-28 2002-12-05 Kazuya Wakita Power transmission shaft
US20120064806A1 (en) * 2010-09-09 2012-03-15 Cooper Randall J System for dispensing abrasives into a gas stream for cleaning pipe interiors
CN211136813U (en) * 2019-09-29 2020-07-31 上海图博可特石油管道涂层有限公司 Flexible sand blasting pipe nozzle
CN112718735A (en) * 2020-12-14 2021-04-30 西部新锆核材料科技有限公司 Method for cleaning inner surface of zirconium alloy pipe
CN113400200A (en) * 2021-07-01 2021-09-17 大连船用柴油机有限公司 Rust removal coating process in triangular box of low-speed marine diesel engine frame

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