CN102494326B - Method for overhauling observation hole of steam generator and tool used - Google Patents
Method for overhauling observation hole of steam generator and tool used Download PDFInfo
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- CN102494326B CN102494326B CN201110383347.5A CN201110383347A CN102494326B CN 102494326 B CN102494326 B CN 102494326B CN 201110383347 A CN201110383347 A CN 201110383347A CN 102494326 B CN102494326 B CN 102494326B
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Abstract
The invention relates to overhauling of a steam generator in a nuclear power plant. Aiming at the problems of long overhauling time, low overhauling efficiency and damage to the body of overhauling personnel existing in the prior art, the invention provides a method for overhauling an observation hole of a steam generator. The method comprises the following steps of: detaching an observation hole outer cover, and removing a used diaphragm pad; grinding the sealing surface of the observation hole by using a grinding tool together with abrasive paper, clamping a new diaphragm pad by using a clamping tool, and inspecting the flatness of the sealing surface of the observation hole; after grinding is qualified, positioning the new diaphragm pad on the observation hole by using a positioning tool, and fixing by welding; and detecting a welding line between the new diaphragm pad and the steam generator by using a liquid permeation detection method, and arranging the observation hole outer cover after welding is qualified. In the method, the sealing surface is ground by using the grinding tool, the flatness of the sealing surface is inspected by clamping the new diaphragm pad with the clamping tool, and the new diaphragm pad is positioned by using the positioning tool, so that working efficiency is increased, working time is shortened, and damage of radiation to the body of working personnel is reduced.
Description
Technical field
The present invention relates to the maintenance of the steam generator in nuclear power station, relate in particular to instrument used in the repair method of peep hole of steam generator and maintenance process.
Background technology
As shown in Figure 1, those skilled in the art adopts barrier film pad 01 to seal the peep hole 02 of steam generator conventionally, be fixed on the opening part of peep hole 02 on the sidewall 03 of steam generator by barrier film pad 01 by the mode of welding, and this opening part is near the outside of steam generator, and above barrier film pad 01, install blank flange 04 additional again and improve sealing, and blank flange 04 is arranged on the sidewall 03 of steam generator by bolt 05.
In the time that the peep hole of this employing barrier film pad sealing is overhauled, opening after peep hole while recovering sealing, must first the welding position of peep hole opening part be ground smoothly, barrier film pad surface is fitted tightly with peep hole opening part, otherwise the sealing effectiveness of peep hole is not up to standard.In addition, also need to reinstall new barrier film pad.This repair method, has not only extended the repair time, also wastes material.Conventionally in the time that the peep hole of steam generator is overhauled, first with electric angle grinder, the weld seam between barrier film pad and peep hole is excised, coordinate sand paper to polish to the weldering meat of peep hole opening part with electric angle grinder again, after polishing flat, install and weld new barrier film pad.There is following problem in such repair method:
The first, in the time that peep hole is overhauled, to utilize and manually the sealing surface of peep hole is ground and new barrier film pad is positioned, grinding efficiency is low, and the position success rate of new barrier film pad is low, has greatly extended the repair time;
The second, because steam generator itself is positioned near nuclear reactor, in radiation high dose area, overhaul efficiency is low, causes the suffered dose of radiation of staff many, and staff's health is caused to too much infringement;
Three, in the time that steam generator is overhauled, unit is in low water level state, now main system is in open state, in the time occurring that abnormal conditions cause unit water level to go up, all openings in shutoff main system immediately, and then cause the radioactive water of being with in steam generator to overflow steam generator, cause nuclear pollution.
Summary of the invention
When steam generator peep hole maintenance for solving prior art, repair time is long, and overhaul efficiency is low, even maintainer's health is caused the problem of too much infringement, the present invention proposes a kind of repair method of peep hole of steam generator, and this repair method comprises the following steps:
First step, removes peep hole enclosing cover, excises old barrier film pad;
Second step, first coordinates sand paper that the sealing surface of peep hole is ground with milling tool smooth, more whether qualified, if qualified, carry out next step if clamping the sealing surface in new barrier film pad survey hole with clamping device, if defective, repeat to grind and checked operation; Described milling tool comprises localization part, means of abrasion and stretches into part, and described localization part is column structure, and is provided with and screws handle in the upper end of this column structure; Described means of abrasion is column structure, and the external diameter of this column structure is greater than the aperture of described peep hole, and the upper end of described means of abrasion and the lower end of described localization part are connected; The described external diameter that stretches into part is less than the aperture of described peep hole, described in stretch into part upper end be connected with the lower end of described means of abrasion, and described in being greater than on the bottom surface of described means of abrasion, to stretch into planar annular be partly abradant surface; Described clamping device comprises clamp structure and at least two positioning linkage rods, and described clamp structure is circulus or the polygonized structure being connected to form by jig arm; Described positioning linkage rod one end is connected with described jig arm, and the other end is interconnecting or is all being connected in a hand held structures away from described clamp structure place, and base angle between described positioning linkage rod and described clamp structure is acute angle;
Third step, described new barrier film pad is positioned with orientation tool, described orientation tool comprises disc structure and fixed claw, middle part at described disc structure is provided with locating slot, described fixed claw is evenly distributed on the periphery of described disc structure, and is provided with positioning through hole at described fixed claw away from one end of described disc structure; The column on described new barrier film pad top is contained in described locating slot, and described orientation tool is fixed on the body of steam generator through described positioning through hole by bolt or screw rod, described new barrier film pad is pressed on described steam generator body, then by welding, described new barrier film pad is arranged on peep hole;
The 4th step, carries out liquid penetrant inspection to the weld seam between described new barrier film pad and steam generator, if the infiltration of the various piece of weld seam evenly, confirm that welding is qualified, if the infiltration of the various piece of weld seam is inhomogeneous, confirm that welding is defective, again welding, until weld qualified;
The 5th step, returns dress peep hole enclosing cover.
Like this, adopt milling tool to grind the sealing surface of peep hole, adopting barrier film pad clamping device to clamp new barrier film pad tests to the sealing surface of peep hole and adopts orientation tool to position new barrier film pad, can increase work efficiency, shorten working hours, and then reduce the infringement that radiation causes staff's health.
Preferably, in the second step of this repair method, described sand paper is fixedly assemblied on described abradant surface, described in inciting somebody to action, stretching into part is insinuated in described peep hole, make the sealing surface laminating of described abradant surface and described peep hole periphery, rotate described milling tool, and the above stretches into part and is provided with ring-type feeder with the junction of described means of abrasion at described milling tool, grinds to collect the metal fragment that comes off.Like this, not only improved grinding efficiency, can also collect and grind the metal fragment coming off, to avoid metal fragment to be clipped between sand paper and sealing surface, the sealing surface of damage peep hole reclaims metal fragment simultaneously, can also avoid environmental pollution.
Further, in the second step of this repair method, on the sealing surface of peep hole, smear red lead powder, rotation clamping device, makes described new barrier film pad rotation, until the photocopy of red lead powder on the sealing surface of described peep hole is loop-like; In rotary course, the top of described new barrier film pad is against on the baffle plate being located on described clamp structure, and described baffle plate is positioned at the side near described hand held structures.Like this, can avoid barrier film pad to slide in clamp structure, improve checkability, shorten Check-Out Time.
Preferably, in the first step of this repair method, removing before peep hole enclosing cover, first to the standing screw of described peep hole enclosing cover being installed and the position at nut or bolt place is numbered, and the mark that mark mates mutually with described numbering on described standing screw and nut or bolt.Like this, can improve location efficiency and return the efficiency of dress peep hole enclosing cover.
Preferably, in maintenance process, in the time occurring that abnormal conditions cause the water level rise in steam generator, adopt emergent shutoff blind plate to seal described peep hole, and be provided with pad between described emergent shutoff blind plate and described peep hole; Described emergent shutoff blind plate comprises disc structure, and on this disc structure, the place of keeping to the side is provided with fixed via equally distributed and that mate with the screwed hole of described peep hole periphery, and is provided with mounting knob on this disc structure.Like this, in the time there are abnormal conditions, can avoid the radioactive water of being with of steam generator inside to overflow, cause nuclear pollution.
The present invention also proposes a kind of milling tool for the peep hole of steam generator is overhauled, and this milling tool comprises localization part, means of abrasion and stretches into part; Described localization part is column structure, is provided with and screws handle in the upper end of this column structure; Described means of abrasion is column structure, and the external diameter of this column structure is greater than the aperture of described peep hole, and the upper end of this column structure and the lower end of described localization part are connected; The described external diameter that stretches into part is less than the aperture of described peep hole, and described in stretch into part upper end be connected with the lower end of described means of abrasion, and described in being greater than on the bottom surface of described means of abrasion, to stretch into planar annular be partly abradant surface.Adopt such milling tool to grind the sealing surface of peep hole, can improve grinding efficiency and grinding effect, shorten milling time, reduce the infringement of the health of nuclear radiation to staff.
Preferably, be provided with ring-type feeder in the described part that stretches into the junction of described means of abrasion.Adopt such milling tool to grind the sealing surface of peep hole, can in grind, collect and grind the metal fragment coming off, to avoid metal fragment to be clipped between sand paper and sealing surface, the sealing surface of damage peep hole, reclaim resource simultaneously, avoid environmental pollution.
The present invention also proposes a kind of clamping device for the peep hole of steam generator is overhauled, this clamping device comprises clamp structure and at least two positioning linkage rods, described clamp structure is circular ring structure or the polygonized structure being connected to form by jig arm, and the side near described positioning linkage rod is provided with baffle plate on this circular ring structure or polygonized structure; Described positioning linkage rod one end is connected with described jig arm, and the other end is interconnecting or is all being connected in a hand held structures away from described clamp structure place, and base angle between described positioning linkage rod and described clamp structure is acute angle.Adopt the grinding effect of the sealing surface of such clamping device clamping barrier film pad to peep hole to test, can improve checkability.
The present invention also proposes a kind of orientation tool for the peep hole of steam generator is overhauled, and this orientation tool comprises disc structure and fixed claw, is provided with the locating slot coordinating with the column on barrier film pad top at the middle part of described disc structure; Described fixed claw is evenly distributed on the periphery of described disc structure, and is provided with at described fixed claw the positioning through hole mating with the screwed hole of peep hole periphery away from one end of described disc structure.Adopt such orientation tool to position barrier film pad, can improve the location efficiency of barrier film pad and effect is installed.
The present invention also proposes a kind of emergent shutoff blind plate for the peep hole of steam generator is overhauled, this emergent shutoff blind plate comprises disc structure, on this disc structure, the place of keeping to the side is evenly distributed with the fixed via mating with the screwed hole of described peep hole periphery, and is provided with mounting knob on this disc structure.Adopt so emergent shutoff blind plate to the peep hole of the opening shutoff of meeting an urgent need, can avoid in the time there are abnormal conditions, in steam generator, with the overflow of radiation, cause nuclear pollution.
Accompanying drawing explanation
Fig. 1 is the cross-sectional schematic of peep hole opening part while adopting barrier film pad to carry out shutoff to the peep hole of steam generator;
Fig. 2 is that the master of the emergent shutoff blind plate of service kit of the peep hole of steam generator of the present invention looks schematic diagram;
Fig. 3 is that the A-A of the emergent shutoff blind plate shown in Fig. 2 is to cross-sectional schematic;
Fig. 4 is the perspective view of the service kit milling tool of the peep hole of steam generator of the present invention;
Fig. 5 is that the service kit milling tool of the peep hole of steam generator of the present invention is not installed the cross-sectional schematic while screwing handle;
Fig. 6 is the perspective view of the clamping device of the service kit barrier film pad of the peep hole of steam generator of the present invention;
Fig. 7 is the perspective view of the orientation tool of the service kit barrier film pad of the peep hole of steam generator of the present invention.
The specific embodiment
In the time of the peep hole of maintenance steam generator, the switch of the opening to peep hole can be divided into following five steps to carry out: first step, and remove blank flange or the similar structures of peep hole outside, and excise old barrier film pad; Second step, the sealing surface of grinding peep hole; Third step, installs new barrier film pad; The 4th step, detects the weld seam between new barrier film pad and peep hole; The 5th step, the blank flange or the similar structures that go back to dress peep hole outside.
Before dismounting blank flange, first the blank flange of peep hole outside and steam generator body are carried out to the mutual mark mating, again the fixing standing screw of blank flange and the position at nut or bolt place are numbered, and the mark that mark mates mutually with the numbering of its position on standing screw and nut or bolt.Then remove standing screw or the bolt of blank flange, pull down blank flange, and protect screwed hole with sealant tape.Like this, can improve back the blank flange of dress peep hole outside or the efficiency of similar structures.Polish off with electric angle grinder the weldering meat being connected between peep hole barrier film pad and steam generator body again, and peep hole barrier film pad is shifted out in peep hole, will excise with regard to barrier film pad.Certainly, also can adopt other instruments to cut the weld seam between barrier film pad and steam generator body.
Due to by after old barrier film pad excision, not necessarily immediately the inside of steam generator is overhauled, therefore can first peep hole be sealed with emergent shutoff blind plate as shown in Figures 2 and 3.This emergent shutoff blind plate comprises disc structure 1, and the place of keeping to the side is provided with equally distributed fixed via 2 on this disc structure 1, like this, just can directly with the set bolt of peep hole enclosing cover, fixing emergent shutoff blind plate be installed.On the disc structure 1 of emergent shutoff blind plate, be provided with mounting knob 3, this mounting knob 3 is " U " type structure, and the openend of this " U " type structure is connected with disc structure 1.Like this, not only make emergent shutoff blind plate be easy to carry, and when mounted, can position it very easily.Preferably, the both sides in the center of circle that is distributed in disc structure 1 of two connecting portion symmetries of " U " type mounting knob 3 and disc structure 1.Certainly, mounting knob 3 can also be " L " type structure or T-shape structure.In order further to improve sealing effectiveness, in the time that emergent shutoff blind plate is installed, can between emergent shutoff blind plate and steam generator body, be provided with rubber sheet gasket.
Certainly, in maintenance process, as long as the abnormal conditions that appearance can cause water level in steam generator to go up, with regard to available emergent shutoff blind plate to the peep hole sealing of meeting an urgent need, to avoid the water with radiation in steam generator from peep hole spills into steam generator, and then avoid nuclear pollution.
For guaranteeing the flatness of sealing surface of peep hole, improve grinding efficiency simultaneously, adopt milling tool as shown in Figures 4 and 5 to grind sealing surface.This milling tool comprises localization part 4, means of abrasion 5 and stretches into part 7.Localization part 4 is column structure, and this column structure is being provided with installation screw near the position of end, upper end, fixedly to screw handle 6.Certainly, localization part 4 can be also to have certain thickness tubular structure.Connect described means of abrasion 5 is set in the lower end of this column structure, this means of abrasion 5 is also column structure, and external diameter is greater than the aperture of peep hole.Be connected with and stretch into part 7 in the bottom of described means of abrasion 5, this external diameter that stretches into part 7 is less than the aperture of peep hole.The bottom surface of this means of abrasion 5 is greater than that to stretch into the planar annular that part 7 forms be abradant surface 8.Preferably, be provided with annular ditch groove in means of abrasion 5 and the junction of stretching into part 7 and grind to collect as feeder 9 metal fillings coming off.Preferably, stretch into part 7 for tubular structure, to alleviate the weight of milling tool.Like this, not only light but also can save consumptive material.Screw handle 6 and can be rod-like structure or disk-like structure.
In the time grinding the sealing surface of peep hole, first sand paper is cut into the shape of the abradant surface 8 that is applicable to milling tool, and this sand paper is assemblied on abradant surface 8, with adhesive tape, this sand paper is fixed, to guarantee that relative sliding does not occur for sand paper and milling tool simultaneously.Then will stretch into part 7 and insert in peep hole, and regulate the position of stretching into part 7, making to stretch between the outer wall of part 7 and the inwall of peep hole has uniform gap.The handle 6 that screws dominated by hand, vertically presses to steam generator body by milling tool, and constantly rotates by a small margin milling tool again, until the sealing surface of peep hole is ground smooth.The flatness of the sealing surface then, then to peep hole is tested.On the sealing surface of peep hole, smear red lead powder, and the top of clamping barrier film pad with the clamping device of the barrier film pad shown in Fig. 6, the bottom of barrier film pad is placed in peep hole, and barrier film pad and sealing surface are evenly fitted, again barrier film pad is vertically pressed to steam generator, rotate barrier film pad, until the photocopy of red lead powder on sealing surface is loop-like simultaneously.Preferably, the width of this closed loop is greater than 4 millimeters.
The clamping device of barrier film pad comprises clamp structure 10, the circulus of this clamp structure 10 for being connected to form by two semicircular ring jig arm 11.Be provided with the through hole vertical with the radial direction of this semicircular ring 12 at the two ends of semicircular ring jig arm 11, two semicircular ring jig arm are connected to form to circulus by bolt or screw rod.Certainly, this clamp structure can be also circular ring structure or the polygonized structure being connected to form by multiple jig arm.Above clamp structure 10, be provided with the orthogonal annulus of this clamp structure 10 as hand held structures 13, so that clamp structure 10 is positioned.Between clamp structure 10 and hand held structures 13, be provided with positioning linkage rod 14, to connect clamp structure 10 and hand held structures 13, and angle between positioning linkage rod 14 and clamp structure 10 is acute angle.Preferably, the connecting portion of positioning linkage rod 14 and clamp structure 10 is positioned at the middle part of semicircular ring jig arm 11, and the bearing of trend of positioning linkage rod 14 is consistent with the radial direction of location annulus.Certainly, can also in jig arm 11 and near a side of hand held structures 13, be provided with baffle plate 15, to avoid barrier film pad to slide along the direction towards hand held structures 13 in clamp structure 10.Further, positioning linkage rod 14 directly can also be linked together away from one end of clamp structure 10, now, positioning linkage rod is hand held structures.
For the sealing surface that makes barrier film pad and peep hole can evenly be fitted, and improve location efficiency, adopt barrier film pad orientation tool as shown in Figure 7 to position new barrier film pad.This orientation tool comprises disc structure 16, and the middle part of this disc structure 16 is provided with locating slot 17, and this locating slot 17 is for coordinating the column structure on top of new barrier film pad.On the periphery of this disc structure 16, be evenly distributed with four fixed claws 18, be provided with positioning through hole 19 in one end away from disc structure 16 of fixed claw 18, orientation tool is installed on steam generator body by bolt or screw rod.
In the time that new barrier film pad is installed, first the bottom of barrier film pad is placed in peep hole, and blocks the column on the top of barrier film pad with the locating slot of orientation tool, the sealing surface of barrier film pad and peep hole is fitted tightly.Then the set bolt of the blank flange by peep hole outside is fixed on orientation tool on steam generator body, and then the top of new barrier film pad is pressed on the outer wall of steam generator body, and bolt is carried out to moment verification, even to guarantee the fastening force of set bolt, new barrier film pad is stressed evenly, and the sealing of the sealing surface of new barrier film pad and peep hole is intact.Check the laminating situation of the sealing surface of new barrier film pad and peep hole, if the two laminating is inhomogeneous, remove orientation tool, again new barrier film pad is positioned; If the two is evenly fitted, carry out spot welding in the edge on the top of new barrier film pad, and after completing, spot welding removes orientation tool, reexamine new barrier film be lined with without crooked with and with the laminating situation of the sealing surface of peep hole, if barrier film pad without crooked and the two laminating evenly, carry out seal welding, if barrier film pad is crooked and the two laminating is inhomogeneous, reorientate welding.
Welding complete and weld seam cooling after, butt welded seam detects.Be sprayed at face of weld by welding inspection liquid, if passed examination is confirmed in the not obviously difference of the infiltration situation of weld seam various piece, otherwise check defectively, need reinstall barrier film pad.After twenty four hours, carry out liquid penetrant inspection for the second time, qualified to confirm to weld.Then blank flange or similar structures and set bolt being cleaned up, return dress blank flange or similar structures, and set bolt is carried out to moment verification, is that the fastening force of set bolt is even.End-of-job.
Certainly, can also adopt additive method to detect the weld seam between peep hole and barrier film pad, as long as can confirm whether welding is qualified.
Claims (6)
1. a repair method for the peep hole of steam generator, is characterized in that, this repair method comprises the following steps:
First step, removes peep hole enclosing cover, excises old barrier film pad;
Second step, first coordinates sand paper that the sealing surface of peep hole is ground with milling tool smooth, more whether qualified, if qualified, carry out next step if clamping the sealing surface in new barrier film pad survey hole with clamping device, if defective, repeat to grind and checked operation; Described milling tool comprises localization part, means of abrasion and stretches into part, and described localization part is column structure, and is provided with and screws handle in the upper end of this column structure; Described means of abrasion is column structure, and the external diameter of this column structure is greater than the aperture of described peep hole, and the upper end of described means of abrasion and the lower end of described localization part are connected; The described external diameter that stretches into part is less than the aperture of described peep hole, described in stretch into part upper end be connected with the lower end of described means of abrasion, and described in being greater than on the bottom surface of described means of abrasion, to stretch into planar annular be partly abradant surface; Described clamping device comprises clamp structure and at least two positioning linkage rods, and described clamp structure is circulus or the polygonized structure being connected to form by jig arm; Described positioning linkage rod one end is connected with described jig arm, and the other end is interconnecting or is all being connected in a hand held structures away from described clamp structure place, and base angle between described positioning linkage rod and described clamp structure is acute angle;
Third step, described new barrier film pad is positioned with orientation tool, described orientation tool comprises disc structure and fixed claw, middle part at described disc structure is provided with locating slot, described fixed claw is evenly distributed on the periphery of described disc structure, and is provided with positioning through hole at described fixed claw away from one end of described disc structure; The column on described new barrier film pad top is contained in described locating slot, and described orientation tool is fixed on the body of steam generator through described positioning through hole by bolt or screw rod, described new barrier film pad is pressed on described steam generator body, then by welding, described new barrier film pad is arranged on peep hole;
The 4th step, carries out liquid penetrant inspection to the weld seam between described new barrier film pad and steam generator, if the infiltration of the various piece of weld seam evenly, confirm that welding is qualified, if the infiltration of the various piece of weld seam is inhomogeneous, confirm that welding is defective, again welding, until weld qualified;
The 5th step, returns dress peep hole enclosing cover.
2. the repair method of the peep hole of steam generator according to claim 1, it is characterized in that, in the second step of this repair method, described sand paper is fixedly assemblied on described abradant surface, described in inciting somebody to action, stretching into part is insinuated in described peep hole, make the sealing surface laminating of described abradant surface and described peep hole periphery, rotate described milling tool, and the above stretches into part and is provided with ring-type feeder with the junction of described means of abrasion at described milling tool, grind to collect the metal fragment coming off.
3. the repair method of the peep hole of steam generator according to claim 1 and 2, it is characterized in that, in the second step of this repair method, on the sealing surface of peep hole, smear red lead powder, rotation clamping device, make described new barrier film pad rotation, until the photocopy of red lead powder on the sealing surface of described peep hole is loop-like; In rotary course, the top of described new barrier film pad is against on the baffle plate being located on described clamp structure, and described baffle plate is positioned at the side near described hand held structures.
4. the repair method of the peep hole of steam generator according to claim 1 and 2, it is characterized in that, in the first step of this repair method, before dismounting peep hole enclosing cover, first to the standing screw of described peep hole enclosing cover being installed and the position at nut or bolt place is numbered, and the mark that mark mates mutually with described numbering on described standing screw and nut or bolt.
5. the repair method of the peep hole of steam generator according to claim 1, it is characterized in that, in maintenance process, in the time occurring that abnormal conditions cause the water level rise in steam generator, adopt emergent shutoff blind plate to seal described peep hole, and be provided with pad between described emergent shutoff blind plate and described peep hole; Described emergent shutoff blind plate comprises disc structure, and on this disc structure, the place of keeping to the side is provided with fixed via equally distributed and that mate with the screwed hole of described peep hole periphery, and is provided with mounting knob on this disc structure.
6. the clamping device for the peep hole of steam generator is overhauled, it is characterized in that, described clamping device comprises clamp structure and at least two positioning linkage rods, described clamp structure is circular ring structure or the polygonized structure being connected to form by jig arm, and the side near described positioning linkage rod is provided with baffle plate on this circular ring structure or polygonized structure; Described positioning linkage rod one end is connected with described jig arm, and the other end is interconnecting or is all being connected in a hand held structures away from described clamp structure place, and base angle between described positioning linkage rod and described clamp structure is acute angle.
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| CN201110383347.5A CN102494326B (en) | 2011-11-28 | 2011-11-28 | Method for overhauling observation hole of steam generator and tool used |
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| CN103144025B (en) * | 2013-02-20 | 2017-09-05 | 马斯特模具（昆山）有限公司 | Glue mouthful size detection and jig for grinding |
| CN104384949A (en) * | 2014-09-16 | 2015-03-04 | 芜湖市华益阀门制造有限公司 | Pressure assisting device of inner hole positioning fixture |
| CN105223205A (en) * | 2015-09-16 | 2016-01-06 | 中广核检测技术有限公司 | Nuclear power station steam generator demarcation strip long-distance video checks and measuring system |
| CN111376170A (en) * | 2019-11-19 | 2020-07-07 | 中国航发贵州黎阳航空动力有限公司 | Machining device for deep hole high-precision sealing surface |
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