CN103363879B - A kind of power pipe bus expands and shrinks monitoring device and method - Google Patents
A kind of power pipe bus expands and shrinks monitoring device and method Download PDFInfo
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- CN103363879B CN103363879B CN201310285483.XA CN201310285483A CN103363879B CN 103363879 B CN103363879 B CN 103363879B CN 201310285483 A CN201310285483 A CN 201310285483A CN 103363879 B CN103363879 B CN 103363879B
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- power pipe
- pipe bus
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- driving stem
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000007246 mechanism Effects 0.000 claims abstract description 30
- 238000006243 chemical reaction Methods 0.000 claims abstract description 29
- 238000006073 displacement reaction Methods 0.000 claims abstract description 20
- 230000001737 promoting effect Effects 0.000 claims abstract description 4
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 24
- 239000010931 gold Substances 0.000 claims description 24
- 229910052737 gold Inorganic materials 0.000 claims description 24
- 230000000694 effects Effects 0.000 claims description 20
- 238000005452 bending Methods 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 description 5
- 230000008602 contraction Effects 0.000 description 5
- 238000009413 insulation Methods 0.000 description 5
- 229910052573 porcelain Inorganic materials 0.000 description 5
- 230000029058 respiratory gaseous exchange Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 241000145637 Lepturus Species 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 241001494479 Pecora Species 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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- Installation Of Bus-Bars (AREA)
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Abstract
The present invention is applicable to power pipe bus technical field, it is provided that a kind of power pipe bus expands and shrinks monitoring device and method. The expansion of described power pipe bus is shunk monitoring device and is comprised movement conversion mechanism and the permanent seat for fixing whole device, described movement conversion mechanism comprises driving stem and rotation axis, described rotation axis one end is fixed with pointer after a dial plate, when promoting described driving stem displacement, described pointer rotates together with described rotation axis. The linear displacement of power pipe bus is amplified the angle displacement converting rotation axis to by the present invention by movement conversion mechanism, and described angle displacement is indicated on dial plate by pointer, facilitates managerial personnel intuitively accurately to observe like this.
Description
Technical field
The invention belongs to power pipe bus technical field, particularly relate to a kind of power pipe bus expansion and shrink monitoring device and method.
Background technology
Substation's high-voltage (220kV, 110kV) grade electric installation, is all connected by tubulose aluminium wire, and these wires are referred to as bus. The effect of bus collects, distributes and transmit electric energy. Bus is divided into hard bus and soft bus by structure, and hard bus is divided into again support type bus and suspension type bus. Support type bus, because of advantages such as its floor space are little, structure is simple, through-flow amount is big, is widely used in 220kV substation.
Support type tubulose bus is made up of bus support, insulation porcelain vase, bus bar cupport, bus bar fixing hardware and power pipe bus usually. described bus support is general apart from ground 3.5-4 rice, described insulation porcelain bottle height degree 1.2 meters, it is fixed on bus support, 220kV bus saves insulation porcelain vases with two, described bus bar cupport is fixed on insulation porcelain vase top, power pipe bus two ends are supported by described bus bar fixing hardware, described bus bar fixing hardware comprises activity formula gold utensil and fixed gold utensil, a fixed gold utensil is installed in power pipe bus one end, the other end installation activity formula gold utensil, when variation of ambient temperature causes power pipe bus to expand with heat and contract with cold, fixed gold utensil limits the breathing direction of power pipe bus, activity formula gold utensil can allow the free breathing of power pipe bus. if activity formula gold utensil occurs that jam faults cannot make power pipe bus freely stretch, there is the serious accidents such as insulation porcelain insulator breaking, bus collapse like this. therefore the breathing situation of power bus often must be monitored, if finding abnormal, take measures to fix a breakdown in time, ensureing power plant safety reliability service.
At present the method for observation power pipe bus expansion contraction situation is the standardized bar markings of power pipe bus in activity formula gold utensil side, and fixing one on the bracket of activity formula gold utensil has the scale of scale and extend to below the markings of tubulose bus. Power pipe bus expands when shrinking, and the scale scale of the markings of pipe bus below it produces to move. If envrionment temperature changes, and the markings of pipe bus are without mobile phenomenon, then explanation activity formula gold utensil has jam faults, it is necessary to take measures immediately to get rid of. But under practical situation, due to the limited length (general about 10 meters) of the power pipe bus of each unit, it is very little with the amplitude of variation of ambient temperature, generally, variation of ambient temperature 1 DEG C, its length variations is less than 0.5mm, and therefore directly observation and comparison is difficult.
Summary of the invention
In view of the above problems, it is an object of the invention to provide a kind of power pipe bus expansion and shrink monitoring device and method, it is intended to solve owing to power pipe bus expansion shrinkage is usually less, the technical problem that direct sighting tube bus linear displacement is more difficult.
On the one hand, the expansion of described power pipe bus is shunk monitoring device and is comprised movement conversion mechanism and the permanent seat for fixing whole device, described movement conversion mechanism comprises driving stem and rotation axis, described rotation axis one end is fixed with pointer after a dial plate, when promoting described driving stem displacement, described pointer rotates together with described rotation axis.
Further, described movement conversion mechanism also comprises the rotary shaft rack being fixed on the described dial plate back side, and described rotation axis one end is through described dial plate, and the other end is through described rotary shaft rack.
Further, described rotary shaft rack and rotation axis junction, and described dial plate and rotation axis junction, be equipped with bearing.
Further, described dial plate is also fixed with the rear cover for the protection of described movement conversion mechanism.
Further, described driving stem is tooth bar, and described rotation axis is the tooth axle being meshed with described tooth bar, and described tooth axle is located on described rotary shaft rack.
Further, described movement conversion mechanism also comprises the stay cord being tightly wrapped on described rotation axis, and the two ends of described stay cord are separately fixed at the two ends of described driving stem.
Further, described driving stem two ends are equipped with pillar, and described pillar is provided with threaded hole, and described threaded hole is provided with the tension screw rod of coupling, the two ends of described stay cord respectively correspondence be fixed on these two tension screw rods.
On the other hand, described power pipe bus expansion contraction monitoring method comprises:
By permanent seat, the expansion of described power pipe bus being shunk monitoring device is fixed on the bus support of power pipe bus; The driving stem of movement conversion mechanism is fixed on the activity formula gold utensil of described power pipe bus; Power pipe bus is heated or meets cold rear generation linear displacement and drive described driving stem; Rotation axis described in described driving stem transmission rotates, and pointer turns over certain angle with described rotation axis and shows at dial plate.
Further, the bus support of described power pipe bus leads to two support bars, by described permanent seat, the expansion of described power pipe bus is shunk monitoring device and is fixed on described two support bars.
Further, the activity formula gold utensil of described power pipe bus leads to a fork-shaped connecting bending component, the two ends of described driving stem are fixed on described connecting bending component.
The invention has the beneficial effects as follows: the present invention by arranging a power pipe bus expansion contraction monitoring device on power pipe bus, the linear displacement of power pipe bus is amplified the angle displacement converting rotation axis to by described device by movement conversion mechanism, and described angle displacement is indicated on dial plate by pointer, managerial personnel are facilitated intuitively accurately to observe like this.
Accompanying drawing explanation
Fig. 1 is the side-view that monitoring device is shunk in the power pipe bus expansion that first embodiment of the invention provides;
Fig. 2 is the front view that monitoring device is shunk in the power pipe bus expansion that first embodiment of the invention provides;
Fig. 3 is the rear view that monitoring device is shunk in the power pipe bus expansion that first embodiment of the invention provides;
Fig. 4 is the side-view that monitoring device is shunk in the power pipe bus expansion that second embodiment of the invention provides;
Fig. 5 is the vertical view that monitoring device is shunk in the power pipe bus expansion that second embodiment of the invention provides;
Fig. 6 is the side-view that monitoring device is shunk in the power pipe bus expansion that third embodiment of the invention provides;
Fig. 7 is the vertical view that monitoring device is shunk in the power pipe bus expansion that third embodiment of the invention provides;
Fig. 8 is the rear view of the preferred structure of the movement conversion mechanism that third embodiment of the invention provides;
Fig. 9 is the vertical view of the preferred structure of the movement conversion mechanism that third embodiment of the invention provides.
Embodiment
In order to make the object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated. It is to be understood that specific embodiment described herein is only in order to explain the present invention, it is not intended to limit the present invention.
In order to technical solutions according to the invention are described, it is described below by specific embodiment.
Embodiment one:
Fig. 1-Fig. 3 is side-view, front view and the rear view that the power pipe bus that first embodiment of the invention provides expands and shrinks monitoring device respectively, illustrate only the part relevant to the embodiment of the present invention for convenience of explanation.
The power pipe bus expansion that the embodiment of the present invention provides is shunk monitoring device and is comprised manual converting mechanism 1 and the permanent seat 4 for fixing whole device, described movement conversion mechanism 1 comprises driving stem 11 and rotation axis 12, described rotation axis 12 one end is fixed with pointer 3 after a dial plate 2, when promoting described driving stem 11 displacement, described rotation axis 12 is together with described indicators turn.
During use, through described permanent seat 4, whole device is fixed on the bus support of power pipe bus with bolt, and driving stem 11 is fixed on the activity formula gold utensil of power pipe bus, after power pipe bus expands with heat and contract with cold, its movable end produces linear displacement, driving described driving stem 11 to move, described driving stem 11 drives described rotation axis 12 and pointer 3 to rotate, and the angle that pointer turns over clearly can indicate on dial plate. Generally, owing to the unit length of pipe bus can not be too long, the aluminium alloy matter pipe bus of a such as root length 10 meters, as variation of ambient temperature �� T=10 DEG C, its breathing amount, the thermal linear expansion coefficient of alloy pipe type bus bar line, therefore �� L=23.91 �� 10-6��104(mm) �� 10 DEG C=2.391mm, so little displacement amount is difficult to observe on about 10 meters high pylons. Assuming that rotation axis 12 diameter is d, the diameter of dial plate 2 is D, then the linear breathing amount magnification K=D/d of the power pipe bus of the embodiment of the present invention, if d=5mm, D=400mm, it is seen that K=80. Therefore pointer is 80 times of actual linear displacement at the scale variable quantity indicated by dial plate, though power pipe bus length subtle change, it is also possible to indicate clearly on dial plate, facilitate managerial personnel intuitively accurately to observe.
Still for the pipe bus of 10 meters, as variation of ambient temperature �� T=10 DEG C, adopt the device of the present embodiment K=80, the variable quantity of 2.39mm just can be converted into the arc length variable quantity of 191.2mm, such variable quantity can very clearly be observed at scene, in this instance, the sensitivity of the present embodiment device is adopted to be 19mm/ DEG C.
Embodiment two:
Fig. 4, Fig. 5 are the side-view and vertical view that the power pipe bus that second embodiment of the invention provides expands and shrinks monitoring device respectively, illustrate only the part relevant to the embodiment of the present invention for convenience of explanation.
The power pipe bus expansion that the present embodiment provides is shunk monitoring device and is comprised the movement conversion mechanism 1 described in embodiment one, dial plate 2 and pointer 3, permanent seat 4, further, with reference to Fig. 4 and Fig. 5, firm in order to ensure rotation axis 12, described movement conversion mechanism 1 also comprises the rotary shaft rack 13 being fixed on described dial plate 2 back side, described rotation axis 12 one end is through described dial plate 2, and the other end is through described rotary shaft rack 13. It is further used as preferred embodiment, described rotary shaft rack 13 and rotation axis 12 junction, and described dial plate 2 and rotation axis 12 junction, it is equipped with bearing 14, it is convenient to rotation axis 12 flexible rotating like this. Preferably, state dial plate 2 and also it is fixed with the rear cover 5 for the protection of described movement conversion mechanism 1.
Mode is implemented as one, in embodiments of the present invention, described movement conversion mechanism is rack tooth axle formula transmission rig, concrete, described driving stem 11 is tooth bar, described rotation axis 12 is the tooth axle being meshed with described tooth bar, described tooth axle is located on described rotary shaft rack 13, power pipe bus expands with heat and contract with cold after driving described tooth bar to produce displacement, tooth axle described in described rack drives rotates, due to pointer length sufficiently long, even if tooth bar moves very small distance, on dial plate, scale variable quantity indicated by pointer is also bigger, concrete, what pointer indicated must spend K times that variable quantity is tooth bar linear displacement, managerial personnel intuitively can accurately observe the expansion contraction change amount of power pipe bus.
Embodiment three:
Fig. 6, Fig. 7 are the side-view and vertical view that the power pipe bus that third embodiment of the invention provides expands and shrinks monitoring device respectively, illustrate only the part relevant to the embodiment of the present invention for convenience of explanation.
The power pipe bus expansion that the present embodiment that this enforcement provides provides is shunk monitoring device and is comprised the movement conversion mechanism 1 described in embodiment one, dial plate 2, pointer 3, permanent seat 4, and described movement conversion mechanism 1 comprises driving stem 11, rotation axis 12, rotary shaft rack 13, bearing 14, covers 5 afterwards.
With embodiment two the difference is that, in embodiments of the present invention, described movement conversion mechanism is stay cord twisted axis formula transmission rig, concrete, described movement conversion mechanism 1 also comprises the stay cord 15 being tightly wrapped on described rotation axis 12, the two ends of described stay cord 15 are separately fixed at the two ends of described driving stem 11, when described driving stem 11 moves, stay cord 15 drives rotation axis 12 to rotate, and then pointer 3 rotates on dial plate 2, equally, even if thin tail sheep occurs driving stem 11, on dial plate, liquid can see that obvious pointer indicating graduation changes, and is convenient to managerial personnel's observation.
The present embodiment device is after long-time work, described stay cord 15 may become some and relax, stay cord 15 possibly cannot drive described rotation axis 12 to rotate, therefore, for the ease of adjusting the tension degree of stay cord, it is further used as preferred embodiment mode, a kind of preferred structure of movement conversion mechanism is shown with reference to Fig. 8 and Fig. 9, described driving stem 11 two ends are equipped with pillar 16, described pillar 16 is provided with threaded hole, described threaded hole is provided with the tension screw rod 17 of coupling, the two ends of described stay cord 15 respectively correspondence be fixed on these two tension screw rods 17 on, when finding that stay cord 15 becomes pine, stay cord 15 can be tightened by adjusting described tension screw rod 17, ensure that stay cord 15 can drive rotation axis 12 to rotate.
Embodiment four:
A kind of power pipe bus that the present embodiment provides expands and shrinks monitoring method, concrete, shrinks monitoring device by above-described embodiment with the power pipe bus expansion provided and realizes monitoring. Described method comprises the steps:
Step S1, by permanent seat by described power pipe bus expand shrink monitoring device be fixed on the bus support of power pipe bus.
Described permanent seat has through hole, by bolt through described through hole, is fixed on the bus support of power pipe bus by whole device. Preferably, the bus support of described power pipe bus leads to two support bars, is fixed on described two support bars by described permanent seat by described device, concrete, on described support bar, liquid has through hole, passes the through hole of described permanent seat and support bar with bolt and tightens.
Step S2, the driving stem of movement conversion mechanism is fixed on the activity formula gold utensil of described power pipe bus.
The two ends of each power pipe bus unit are fixed by activity formula gold utensil and fixed gold utensil respectively, one end that fixed gold utensil is fixed can not be moved, one end that activity formula gold utensil is fixed can be moved, and in this step, is fixed on by described driving stem on the activity formula gold utensil of described power pipe bus. Preferably, the activity formula gold utensil of described power pipe bus leading to a fork-shaped connecting bending component, the two ends of described driving stem are fixed on described connecting bending component, described driving stem and connecting bending component all have through hole, is bolted.
Step S3, power pipe bus are heated or meet cold rear generation linear displacement and drive described driving stem.
Power pipe bus be heated or meet cold after, one end fixing by activity formula gold utensil produces displacement, and activity formula gold utensil drives described driving stem.
Rotation axis described in step S4, described driving stem transmission rotates, and pointer turns over certain angle with described rotation axis and indicates at dial plate.
Driving stem drives rotation axis to rotate, and now pointer can turn over certain angle, and the scale variable quantity indicated by pointer is K times of power pipe bus expansion shrinkage, and managerial personnel intuitively can accurately observe the expansion contraction change amount of power pipe bus according to scale change.
To sum up, embodiments provide a kind of power pipe bus expansion and shrink monitoring device and method, the linear change amount amplification of power pipe bus is converted to angle variable quantity by described device, and indicate on dial plate, indicators turn is highly sensitive, even if variation of ambient temperature is less, the expansion shrinkage of power pipe bus can also be known and accurately shows, and is convenient to managerial personnel's observation.
The foregoing is only the better embodiment of the present invention, not in order to limit the present invention, all any amendment, equivalent replacement and improvement etc. done within the spirit and principles in the present invention, all should be included within protection scope of the present invention.
Claims (5)
1. a power pipe bus expands and shrinks monitoring device, it is characterized in that, described device comprises movement conversion mechanism (1) and the permanent seat (4) for fixing whole device, described movement conversion mechanism (1) comprises driving stem (11) and rotation axis (12), described rotation axis (12) one end is fixed with pointer (3) after a dial plate (2), when promoting described driving stem (11) displacement, described pointer (3) rotates together with described rotation axis (12); Described movement conversion mechanism (1) also comprises the rotary shaft rack (13) being fixed on described dial plate (2) back side, described rotation axis (12) one end is through described dial plate (2), and the other end is through described rotary shaft rack (13);
Described rotary shaft rack (13) and rotation axis (12) junction, and described dial plate (2) and rotation axis (12) junction, be equipped with bearing (14);
Described dial plate (2) is also fixed with the rear cover (5) for the protection of described movement conversion mechanism (1);
Described movement conversion mechanism (1) also comprises the stay cord (15) being tightly wrapped on described rotation axis (12), and the two ends of described stay cord (15) are separately fixed at the two ends of described driving stem (11);
Described driving stem (11) two ends are equipped with pillar (16), described pillar (16) is provided with threaded hole, described threaded hole is provided with the tension screw rod (17) of coupling, the two ends of described stay cord (15) respectively correspondence be fixed on these two tensions screw rod (17).
2. power pipe bus expands and shrinks monitoring device as claimed in claim 1, it is characterized in that, described driving stem (11) is tooth bar, and described rotation axis (12) is the tooth axle being meshed with described tooth bar, and described tooth axle is located on described rotary shaft rack (13).
3. a power pipe bus expands and shrinks monitoring method, it is characterised in that, described method comprises:
By permanent seat, the power pipe bus expansion as described in item as arbitrary in claim 1-2 being shunk monitoring device is fixed on the bus support of power pipe bus;
The driving stem of movement conversion mechanism is fixed on the activity formula gold utensil of described power pipe bus;
Power pipe bus is heated or meets cold rear generation linear displacement and drive described driving stem;
Rotation axis described in described driving stem transmission rotates, and pointer turns over certain angle with described rotation axis and indicates at dial plate.
4. method as claimed in claim 3, it is characterised in that, the bus support of described power pipe bus leads to two support bars, is expanded by described power pipe bus by described permanent seat and shrinks monitoring device and be fixed on described two support bars.
5. method as described in claim 3 or 4, it is characterised in that, the activity formula gold utensil of described power pipe bus leads to a fork-shaped connecting bending component, the two ends of described driving stem are fixed on described connecting bending component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310285483.XA CN103363879B (en) | 2013-07-09 | 2013-07-09 | A kind of power pipe bus expands and shrinks monitoring device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310285483.XA CN103363879B (en) | 2013-07-09 | 2013-07-09 | A kind of power pipe bus expands and shrinks monitoring device and method |
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| Publication Number | Publication Date |
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| CN103363879A CN103363879A (en) | 2013-10-23 |
| CN103363879B true CN103363879B (en) | 2016-06-01 |
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| CN201310285483.XA Expired - Fee Related CN103363879B (en) | 2013-07-09 | 2013-07-09 | A kind of power pipe bus expands and shrinks monitoring device and method |
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| CN (1) | CN103363879B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110763174B (en) * | 2017-12-27 | 2021-05-04 | 蔡仁杰 | Bus stretching amount detection system in high-voltage distribution system |
| CN112042704A (en) * | 2020-09-02 | 2020-12-08 | 德清县海杰包装有限公司 | Food fermentation case with fermentation volume monitoring function |
| CN114935114A (en) * | 2022-06-17 | 2022-08-23 | 华能南京燃机发电有限公司 | Long-distance industrial steam pipeline rotary compensator compensation amount indicating device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2127169Y (en) * | 1992-07-04 | 1993-02-17 | 王宪桥 | Contraction measuring instrument |
| CN201402144Y (en) * | 2008-12-02 | 2010-02-10 | 林昶 | Instrument displacement conversion amplifier |
| CN202676123U (en) * | 2012-05-14 | 2013-01-16 | 平高集团有限公司 | Bus corrugated pipe and telescopic length measuring device thereof |
| CN202770357U (en) * | 2012-09-14 | 2013-03-06 | 中煤科工集团重庆研究院 | Surrounding rock mobile sensor |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6035009B2 (en) * | 1979-03-28 | 1985-08-12 | 石川島播磨重工業株式会社 | Sample deformation measuring device |
| JP2002243403A (en) * | 2001-02-09 | 2002-08-28 | Shinei Denshi Keisokki Kk | Method and device for display of crack amount of tunnel inner wall, etc. |
-
2013
- 2013-07-09 CN CN201310285483.XA patent/CN103363879B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2127169Y (en) * | 1992-07-04 | 1993-02-17 | 王宪桥 | Contraction measuring instrument |
| CN201402144Y (en) * | 2008-12-02 | 2010-02-10 | 林昶 | Instrument displacement conversion amplifier |
| CN202676123U (en) * | 2012-05-14 | 2013-01-16 | 平高集团有限公司 | Bus corrugated pipe and telescopic length measuring device thereof |
| CN202770357U (en) * | 2012-09-14 | 2013-03-06 | 中煤科工集团重庆研究院 | Surrounding rock mobile sensor |
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