CN111673677A - Device and method for disassembling tight bushing of hydroelectric generating set - Google Patents
Device and method for disassembling tight bushing of hydroelectric generating set Download PDFInfo
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- CN111673677A CN111673677A CN202010647007.8A CN202010647007A CN111673677A CN 111673677 A CN111673677 A CN 111673677A CN 202010647007 A CN202010647007 A CN 202010647007A CN 111673677 A CN111673677 A CN 111673677A
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- generating set
- bushing
- hydroelectric generating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
- B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
- B25B27/026—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same fluid driven
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Abstract
The invention provides a device and a method for disassembling a tight bush of a hydroelectric generating set, wherein a top sleeve comprises two semicircular sleeve plates, the lower parts of the two semicircular sleeve plates are sleeved at the end part of the bush, the outer circumference of the upper end of each sleeve plate is provided with a convex disc body, the lower part of the top sleeve is provided with a bottom plate, the bottom plate is arranged on a boss of a main shaft of an aeration valve, at least two hydraulic cylinders are arranged between the bottom plate and the top sleeve, the piston ends of the hydraulic cylinders are abutted against the disc body at the upper end of the top sleeve, the sleeve plates comprise a first sleeve plate and a second sleeve plate, the first sleeve plate and the second sleeve plate are rotationally symmetrical along the axis, the first sleeve plate is provided with a plurality of lug plates, the two sleeve plates penetrate through the lug plates through double-head nuts to form the top sleeve, the lug plates are provided with positioning structures, the sleeve of the aeration valve of the hydroelectric generating, the sealing effect of the gulp valve is enhanced, the working efficiency is improved, the structure is simple, the use is convenient, and the gulp valve is suitable for popularization and use.
Description
Technical Field
The invention relates to the field of disassembly of a tight bushing of a hydroelectric generating set, in particular to a device and a method for disassembling the tight bushing of the hydroelectric generating set.
Background
The sealing ring of the air compensating valve of the water turbine generator set needs to be replaced regularly, and a main shaft bushing of the air compensating valve needs to be detached when the sealing is replaced. The sleeve and the main shaft are clamped after the machine set runs for a long time, tools such as pipe tongs and a hand hammer are usually used under the condition that no special tool is provided, the disassembly is difficult or impossible, and the sleeve is damaged and deformed in the disassembly process to influence the sealing effect.
Chinese patent CN 205950640U "an oil pump bush dismounting device" discloses an oil pump bush dismounting device, including anchor clamps, the first lantern ring and the second lantern ring, anchor clamps are including drawing the claw, drawing seat and screw rod, draw the claw to install draw on the seat, the screw rod is worn to locate draw the central point of seat to put, the first lantern ring be equipped with draw claw assorted recess, the first lantern ring comprises two semi-rings, the second lantern ring cup joints on the first lantern ring. The structure needs manual rotation to take off the bush, and if the condition of deviating from the axle center occurs, the whole bush can be damaged.
Disclosure of Invention
The invention mainly aims to provide a device and a method for disassembling a tight bush of a hydroelectric generating set, which solve the problems that a sleeve and a main shaft are blocked after the hydroelectric generating set runs for a long time, the disassembly is difficult or impossible by using tools such as pipe tongs and a hand hammer under the condition that special tools are not available, and the sealing effect is influenced by damage and deformation of the sleeve in the disassembly process.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the utility model provides a hydroelectric set inseparable bush dismounting device, includes the top cover, and the top cover includes two semicircular lagging, and two semicircular lagging below covers establishes at the bush tip, and the excircle border of lagging upper end is equipped with convex disk body, and the top cover below is equipped with the bottom plate, and the bottom plate is established on aeration valve main shaft boss, is equipped with two at least pneumatic cylinders between bottom plate and the top cover, and the pneumatic cylinder piston end supports and leans on the disk body of top cover upper end.
In a preferred scheme, the sleeve plate comprises a first sleeve plate and a second sleeve plate, and the first sleeve plate and the second sleeve plate are rotationally symmetrical along the axis.
In the preferred scheme, be equipped with a plurality of otic placodes on the first lagging, two lagging pass the otic placode through double-end nut and form the top cover, be equipped with location structure on the otic placode.
In a preferred scheme, the lug plate comprises a positioning concave lug plate and a positioning convex lug plate, a boss of the positioning convex lug plate is matched with a groove of the positioning concave lug plate, and the lug plate above the top sleeve is transversely arranged;
so that the first strap and the second strap are oriented in an up-and-down direction.
In the preferred scheme, the lower end of the top sleeve penetrates through ear plates and ear plates through double-headed nuts to be connected, and the ear plates are vertically arranged;
so that the first and second socket plates are positioned in the right and left direction.
In a preferred scheme, a lantern ring is arranged between the first sleeve plate and the second sleeve plate and sleeved at the end part of the bushing.
In the preferred scheme, the top cover top is equipped with protective case, and protective case includes that two piece at least circular arc section of jurisdiction concatenations form, protective case tip is established inside the lantern ring and is leaned on the boss inside the lantern ring.
In the preferred scheme, the bottom plate comprises a first semi-circular plate and a second semi-circular plate, the first circular plate and the second circular plate are rotationally symmetrical along the axis, the first circular plate and the second circular plate are connected through ear plates, protruding positioning blocks are arranged on two sides of the ear plate at one end of the first circular plate, and a positioning table matched with the positioning blocks is arranged at the other end of the first circular plate.
In the preferred scheme, the hydraulic cylinder body is arranged on the placing groove of the bottom plate, and the piston end of the hydraulic cylinder is arranged in the top plate groove of the top sleeve.
The method comprises the following steps:
s1, sleeving the first circular plate and the second circular plate on the boss of the air compensating valve main shaft to splice an annular bottom plate, and adjusting the balance of the bottom plate by using a level gauge;
s2, placing the hydraulic cylinder in a placing groove of the bottom plate, and communicating the hydraulic cylinder with an electromagnetic directional valve through a hydraulic pipeline, wherein the electromagnetic directional valve is communicated with a hydraulic pump;
s3, adjusting the electromagnetic directional valve and the hydraulic pump to enable the two hydraulic cylinders to retract to the bottommost part, and enabling the end parts of the piston ends of the two hydraulic cylinders to be kept on the same plane;
s4, sleeving the first sleeve plate and the second sleeve plate at the end part of the bushing, enabling bosses at the bottoms of the first sleeve plate and the second sleeve plate to abut against the end part of the bushing, and rotating the first sleeve plate and the second sleeve plate into a top sleeve through nuts;
s5, adjusting the hydraulic cylinder to enable the end part of the hydraulic cylinder to abut against the inner part of the top plate groove;
s6, installing a protective sleeve, wherein the protective sleeve is sleeved outside the bushing, and the end part of the protective sleeve is inserted into the lantern ring above the top sleeve;
and S7, pushing by a hydraulic cylinder for 5-7 seconds, stopping for 8-10 seconds, pushing again for 5-7 seconds, repeatedly and intermittently pushing to directly eject the bushing, wherein the pushing method prevents the end of the bushing from ejecting and bulging or generating cracks due to over-tightening of the bushing.
The invention provides a device and a method for disassembling a tight bush of a hydroelectric generating set, which improve the original simpler disassembling method, fix a special tool for disassembling the bush at the lower end part of a sleeve, and push out the sleeve by matching a hydraulic cylinder.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a front view structural diagram of the present invention;
FIG. 2 is a front cross-sectional block diagram of the present invention;
FIG. 3 is a hydraulic circuit configuration of the present invention;
FIG. 4 is a side view block diagram of the present invention;
FIG. 5 is a bushing installation structure of the present invention;
FIG. 6 is a view showing the construction of the detaching device of the present invention;
fig. 7 is a view showing the construction of the installation of the protective sleeve of the present invention;
FIG. 8 is a top view of the top cover of the present invention;
FIG. 9 is a left side view of the top cover of the present invention;
FIG. 10 is a side view structural view of the top cover of the present invention;
FIG. 11 is a disassembled view of the top cover of the present invention;
FIG. 12 is a disassembled view of the top cover, bottom plate and hydraulic cylinder of the present invention;
FIG. 13 is a disassembled view of the base plate of the present invention;
FIG. 14 is a top view block diagram of the base plate of the present invention;
in the figure: a main shaft 1 of the gulp valve; a bushing 2; a top sleeve 3; a first deck 301; a second strap 302; positioning lug plate 303; positioning the lug plate 304; a collar 305; a ceiling slot 308; a hydraulic cylinder 4; a bottom plate 5; a first circular plate 501; a second circular plate 502; a placement groove 503; a positioning block 504; a positioning table 505; a protective sleeve 6; an electromagnetic directional valve 7; a pressure reducing valve 8; a hydraulic pump 9; a filter 10.
Detailed Description
Example 1
As shown in fig. 1-14, a hydroelectric set inseparable bush dismounting device, including top cover 3, top cover 3 includes two semicircular lagging, and two semicircular lagging below covers and establishes at 2 tip of bush, and the excircle periphery in lagging upper end is equipped with convex disk body, and top cover 3 below is equipped with bottom plate 5, and bottom plate 5 establishes on 1 boss of aeration valve main shaft, is equipped with two at least pneumatic cylinders 4 between bottom plate 5 and top cover 3, and the piston end of pneumatic cylinder 4 supports and leans on the disk body of top cover 3 upper end. From this structure, utilize 4 top pushes away of pneumatic cylinder to push up cover 3, push up cover 3 and drive the bush and rise, reach and dismantle the purpose, and push up 3 lower parts of cover and wrapping up 2 tip of bush and be used for protecting 2 tip of bush not to bear the pressure top bad, it is comparatively convenient to dismantle, has improved work efficiency, simple structure, and convenient to use is fit for using widely.
In a preferred embodiment, the strap comprises a first strap 301 and a second strap 302, and the first strap 301 and the second strap 302 are rotationally symmetrical around the axis. With this structure, the first sleeve plate 301 and the second sleeve plate 302 are assembled into the top sleeve 3, and the first sleeve plate 301 and the second sleeve plate 302 have the same structure, thereby realizing rotational symmetry along the axis.
In the preferred scheme, be equipped with a plurality of otic placodes on the first lagging 301, two lagging pass the otic placode through double-end nut and form top cover 3, be equipped with location structure on the otic placode. With this structure, the ear plate positioning structure positions the first deck 301 and the second deck 302.
In the preferred scheme, the otic placode includes location concave ear board 304 and location convex ear board 303, and location convex ear board 303 boss cooperates with the recess of location concave ear board 304, the otic placode of top cover 3 top transversely sets up to make first otic placode 301 and second otic placode 302 orientation from top to bottom. With the structure, the first sleeve plate 301 and the second sleeve plate 302 are limited in the vertical direction, and as shown in fig. 9, the first sleeve plate 301 and the second sleeve plate 302 can be aligned and positioned in a plane through the boss.
In the preferred scheme, 3 lower extremes on the top cover pass the otic placode through double-end nut and connect, the vertical setting of otic placode to make first otic placode 301 and second otic placode 302 left and right directions location. With this structure, as shown in fig. 8, the first strap 301 and the second strap 302 can be positioned in the left-right direction by the bosses.
Preferably, a collar 305 is arranged between the first sleeve plate 301 and the second sleeve plate 302, and the collar 305 is sleeved on the end of the bushing 2. With this structure, the collar 305 serves to protect the end of the liner 2 from deformation.
In the preferred scheme, top cover 3 top is equipped with protective sleeve 6, and protective sleeve 6 includes that at least two circular arc section of jurisdiction splice form, protective sleeve 6 tip is established inside the lantern ring 305 and is leaned on the boss inside the lantern ring 305. With this structure, the protection sleeve 6 protects the middle of the liner 2 from being bulged or broken by the top.
In a preferable scheme, the bottom plate 5 comprises a first half-shaped circular plate 501 and a second half-shaped circular plate 502, the first half-shaped circular plate 501 and the second half-shaped circular plate 502 are rotationally symmetrical along an axis, the first half-shaped circular plate 501 and the second half-shaped circular plate 502 are connected through ear plates, protruding positioning blocks 504 are arranged on two sides of the ear plate at one end of the first half-shaped circular plate 501, and a positioning table 505 matched with the positioning blocks 504 is arranged at the other end of the first half-shaped circular plate. With this structure, the first disk 501 and the second disk 502 constitute the base plate 5, and are positioned by the positioning block 504 and the positioning table 505.
Preferably, the cylinder 4 is disposed on the placing groove 503 of the bottom plate 5, and the piston end of the cylinder 4 is disposed inside the top plate groove 308 of the top cover 3. This structure is used for mounting the hydraulic cylinder 4.
Example 2
Further description is given in conjunction with example 1, as shown in FIGS. 1 to 14: the method comprises the following steps:
a first circular plate 501 and a second circular plate 502 are sleeved on the boss of the aeration valve main shaft 1 and are spliced into an annular bottom plate 5, and the balance of the bottom plate 5 is adjusted by using a level gauge.
The hydraulic cylinder 4 is placed in the placement groove 503 of the bottom plate 5 and communicated with the electromagnetic directional valve 7 by a hydraulic pipeline, and the electromagnetic directional valve 7 is communicated with the hydraulic pump 9.
The electromagnetic directional valve 7 and the hydraulic pump 9 are adjusted to enable the two hydraulic cylinders 4 to retract to the bottommost part, so that the piston end parts of the two hydraulic cylinders 4 are kept on the same plane.
The first sleeve plate 301 and the second sleeve plate 302 are sleeved at the end of the bushing 2, the bosses at the bottoms of the first sleeve plate 301 and the second sleeve plate 302 abut against the end of the bushing 2, and the first sleeve plate 301 and the second sleeve plate 302 are combined into the top sleeve 3 through nuts.
The hydraulic cylinder 4 is adjusted so that the end of the hydraulic cylinder 4 abuts against the inside of the ceiling groove 308.
A protective sleeve 6 is added, the protective sleeve 6 is sleeved outside the bushing 2, and the end part is inserted into the lantern ring 305 above the top sleeve 3.
And pushing by the hydraulic cylinder 4 for 5-7 seconds, stopping for 8-10 seconds, pushing for 5-7 seconds again, repeatedly and intermittently pushing to directly eject the bushing 2, and preventing the end of the bushing 2 from being ejected and bulged or generating cracks due to over-tightening of the bushing 2. When the jacking is proper, the jacking and pushing are carried out for 5-7 seconds, whether the lining 2 bulges or cracks occur or not is observed, the hydraulic cylinder 4 stops for 8-10 seconds, the stress in the lining 2 is cancelled, the lining 2 is prevented from deforming, and the lining 2 is protected from being damaged by jacking due to repeated intermittent jacking.
The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and the scope of the present invention is defined by the claims, and equivalents including technical features described in the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the invention.
Claims (10)
1. The utility model provides a tight bush dismounting device of hydroelectric set, characterized by: including top cover (3), top cover (3) include two semicircular lagging, and two semicircular lagging below covers establish at bush (2) tip, and the excircle periphery in lagging upper end is equipped with convex disk body, and top cover (3) below is equipped with bottom plate (5), and bottom plate (5) are established on gulp valve main shaft (1) boss, are equipped with two at least pneumatic cylinders (4) between bottom plate (5) and top cover (3), and pneumatic cylinder (4) piston end supports and leans on the disk body of top cover (3) upper end.
2. The tight bush dismounting device of hydroelectric generating set according to claim 1, characterized by: the sleeve plate comprises a first sleeve plate (301) and a second sleeve plate (302), and the first sleeve plate (301) and the second sleeve plate (302) are rotationally symmetrical along the axis.
3. The tight bush dismounting device of hydroelectric generating set according to claim 2, characterized by: be equipped with a plurality of otic placodes on first lagging (301), two lagging pass the otic placode through double-end nut and form top cover (3), be equipped with location structure on the otic placode.
4. The tight bush dismounting device of hydroelectric generating set according to claim 3, characterized in that: the ear plate comprises a positioning concave ear plate (304) and a positioning convex ear plate (303), a boss of the positioning convex ear plate (303) is matched with a groove of the positioning concave ear plate (304), and the ear plate above the top sleeve (3) is transversely arranged;
so that the first nest plate (301) and the second nest plate (302) are positioned in the up-down direction.
5. The tight bush dismounting device of hydroelectric generating set according to claim 4, characterized in that: the lower end of the top sleeve (3) penetrates through the ear plate through a double-headed nut to be connected, and the ear plate is vertically arranged;
so that the first strap (301) and the second strap (302) are positioned in the left-right direction.
6. The tight bush dismounting device of hydroelectric generating set according to claim 2, characterized by: a sleeve ring (305) is arranged between the first sleeve plate (301) and the second sleeve plate (302), and the sleeve ring (305) is sleeved at the end part of the bushing (2).
7. The tight bush dismounting device of the hydroelectric generating set according to claim 2, characterized in that; top cover (3) top is equipped with protective case (6), and protective case (6) include that two piece at least circular arc section of jurisdiction splice form, protective case (6) tip is established inside the lantern ring (305) and is leaned on the boss of lantern ring (305) inside.
8. The tight bush dismounting device of hydroelectric generating set according to claim 1, characterized by: bottom plate (5) include first plectane (501) and second plectane (502) of two half shapes, first plectane (501) and second plectane (502) are along axle center rotational symmetry, and first plectane (501) and second plectane (502) are connected through the otic placode, first plectane (501) one end otic placode both sides are equipped with convex locating piece (504), and the other end is equipped with location platform (505) that matches with locating piece (504).
9. The tight bush dismounting device of hydroelectric generating set according to claim 1, characterized by: the cylinder body of the hydraulic cylinder (4) is arranged on the placing groove (503) of the bottom plate (5), and the piston end of the hydraulic cylinder (4) is arranged in the top plate groove (308) of the top sleeve (3).
10. The method for dismounting the tight bush dismounting device of the hydroelectric generating set according to any one of claims 1 to 9, which is characterized in that:
the method comprises the following steps:
s1, sleeving a first circular plate (501) and a second circular plate (502) on a boss of a main shaft (1) of the gulp valve to splice an annular bottom plate (5), and adjusting the balance of the bottom plate (5) by using a level gauge;
s2, placing the hydraulic cylinder (4) in a placing groove (503) of a bottom plate (5), communicating with an electromagnetic directional valve (7) through a hydraulic pipeline, and communicating the electromagnetic directional valve (7) with a hydraulic pump (9);
s3, adjusting the electromagnetic directional valve (7) and the hydraulic pump (9) to enable the two hydraulic cylinders (4) to retract to the bottommost part, and enabling the end parts of the piston ends of the two hydraulic cylinders (4) to be kept on the same plane;
s4, sleeving a first sleeve plate (301) and a second sleeve plate (302) at the end of the bushing (2), abutting bosses at the bottoms of the first sleeve plate (301) and the second sleeve plate (302) against the end of the bushing (2), and rotating the first sleeve plate (301) and the second sleeve plate (302) into a top sleeve (3) through nuts;
s5, adjusting the hydraulic cylinder (4) to enable the end part of the hydraulic cylinder (4) to abut against the inside of the top plate groove (308);
s6, installing a protective sleeve (6), wherein the protective sleeve (6) is sleeved outside the bushing (2), and the end part of the protective sleeve is inserted into the lantern ring (305) above the top sleeve (3);
s7, pushing by a hydraulic cylinder (4) for 5-7 seconds, stopping for 8-10 seconds, pushing again for 5-7 seconds, repeatedly and intermittently pushing to directly eject the bushing (2), and the pushing method prevents the end of the bushing (2) from ejecting and bulging or generating cracks due to over-tightening of the bushing (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010647007.8A CN111673677A (en) | 2020-07-07 | 2020-07-07 | Device and method for disassembling tight bushing of hydroelectric generating set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010647007.8A CN111673677A (en) | 2020-07-07 | 2020-07-07 | Device and method for disassembling tight bushing of hydroelectric generating set |
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| Publication Number | Publication Date |
|---|---|
| CN111673677A true CN111673677A (en) | 2020-09-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010647007.8A Pending CN111673677A (en) | 2020-07-07 | 2020-07-07 | Device and method for disassembling tight bushing of hydroelectric generating set |
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| CN (1) | CN111673677A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112621649A (en) * | 2020-12-15 | 2021-04-09 | 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) | Disassembling tool for shaft sealing device and using method thereof |
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|---|---|---|---|---|
| EP0100792A2 (en) * | 1982-08-10 | 1984-02-22 | CARAVEL S.A.S. di Maniaci Maria Rita & C. | Hydraulic device for removing and inserting marine bushings |
| US5317793A (en) * | 1991-03-29 | 1994-06-07 | The Boeing Company | Apparatus for installing bushings concentrically in a bore |
| EP2033741A2 (en) * | 2007-08-10 | 2009-03-11 | Asturiojana de Proyectos S.L. | Tool for removing and assembling |
| CN204565585U (en) * | 2015-04-23 | 2015-08-19 | 上海建卫金属制品有限公司 | Pedal support broached bushing press-loading apparatus |
| CN205950640U (en) * | 2016-08-17 | 2017-02-15 | 海南金海浆纸业有限公司 | Oil pump bush dismounting device |
| CN109262238A (en) * | 2018-10-19 | 2019-01-25 | 中车长春轨道客车股份有限公司 | Rail vehicle wears away bushing dismounting device and method for dismounting |
| CN212399437U (en) * | 2020-07-07 | 2021-01-26 | 湖北清江水电开发有限责任公司 | Tight bush dismounting device of hydroelectric set |
| CN113510657A (en) * | 2021-06-30 | 2021-10-19 | 国营四达机械制造公司 | Bushing assembling tool and assembling method thereof |
-
2020
- 2020-07-07 CN CN202010647007.8A patent/CN111673677A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0100792A2 (en) * | 1982-08-10 | 1984-02-22 | CARAVEL S.A.S. di Maniaci Maria Rita & C. | Hydraulic device for removing and inserting marine bushings |
| US5317793A (en) * | 1991-03-29 | 1994-06-07 | The Boeing Company | Apparatus for installing bushings concentrically in a bore |
| EP2033741A2 (en) * | 2007-08-10 | 2009-03-11 | Asturiojana de Proyectos S.L. | Tool for removing and assembling |
| CN204565585U (en) * | 2015-04-23 | 2015-08-19 | 上海建卫金属制品有限公司 | Pedal support broached bushing press-loading apparatus |
| CN205950640U (en) * | 2016-08-17 | 2017-02-15 | 海南金海浆纸业有限公司 | Oil pump bush dismounting device |
| CN109262238A (en) * | 2018-10-19 | 2019-01-25 | 中车长春轨道客车股份有限公司 | Rail vehicle wears away bushing dismounting device and method for dismounting |
| CN212399437U (en) * | 2020-07-07 | 2021-01-26 | 湖北清江水电开发有限责任公司 | Tight bush dismounting device of hydroelectric set |
| CN113510657A (en) * | 2021-06-30 | 2021-10-19 | 国营四达机械制造公司 | Bushing assembling tool and assembling method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112621649A (en) * | 2020-12-15 | 2021-04-09 | 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) | Disassembling tool for shaft sealing device and using method thereof |
| CN112621649B (en) * | 2020-12-15 | 2022-07-08 | 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) | Disassembling tool for shaft sealing device and using method thereof |
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