CN105651472A - Device integrating fuel gas plugging and vertical pipe pressure testing and plugging pressure testing method - Google Patents
Device integrating fuel gas plugging and vertical pipe pressure testing and plugging pressure testing method Download PDFInfo
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- CN105651472A CN105651472A CN201610220793.7A CN201610220793A CN105651472A CN 105651472 A CN105651472 A CN 105651472A CN 201610220793 A CN201610220793 A CN 201610220793A CN 105651472 A CN105651472 A CN 105651472A
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- standpipe
- pressure testing
- adjusting lever
- support set
- combustion gas
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
- G01M3/2815—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes using pressure measurements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/10—Means for stopping flow from or in pipes or hoses
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Mechanical Engineering (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention discloses a device integrating fuel gas plugging and vertical pipe pressure testing and a plugging pressure testing method. The device comprises a supporting sleeve and an adjusting rod, wherein the adjusting rod comprises a prolonging section, a connecting section and a swelling section, of which the outer diameters are gradually reduced; the supporting sleeve comprises a prolonging part and a connecting part; a locking thread is arranged at a joint of the prolonging part and the connecting part; a through hole is formed at the lower end of the locking thread on the supporting sleeve; a rear sleeve is in threaded connection with the top end of the supporting sleeve; a hollow joint is arranged on the rear sleeve; and an air hole which is communicated with the hollow joint is formed in the rear sleeve. According to the scheme, the plugging and the pressure testing are integrated, so that the scope of gas supply stopping is reduced, the risk in rescuing maintenance operation is reduced and the device and method are brand-new device and method for ensuring the quick and accurate rescuing operation.
Description
Technical field
The present invention relates to a kind of combustion gas to speedily carry out rescue work maintenance unit, be specifically related to a kind of combustion gas closure and the device of standpipe pressure testing one; It is directed to combustion gas speedily carry out rescue work maintenance technique field, is specifically related to combustion gas closure pressure-measuring method.
Background technology
Combustion gas be mainly composed of methane, many as a kind of raw materials of industry or clean energy resource, for national product with live. As it is shown in figure 1, in building house 1, every floor all can be provided with arm before user's gas table, and before user's gas table, arm pipeline is connected to standpipe 2, standpipe 2 introduces pipe 3 by user and is positioned at underground combustion gas distribution arm 4 and is connected. User introduces the structure of pipe 3, including the purging stake 31 connected with combustion gas distribution arm 4, purges the stake 31 curved standpipe 2 leading to logical building by tee T 32, the straight pipe at the top of tee T 32 is provided with pipe plug 33. Each residential quarter can be supplied by general gas company by combustion gas distribution arm 4, combustion gas passes sequentially through purging stake 31, tee T 32, standpipe 2 hence in arm before the user's gas table of each floor by combustion gas distribution arm 4, in order to the user of each layer is easy to use.
But, above-mentioned pipeline, as the pipeline of transporting combustible gases, is generally steel pipe, easily there is the situation of leakage in steel pipe, main cause is as follows: 1, due to the life-time service of steel pipe, meeting natural rust, and the leakage phenomenon that slight crack and corrosion cause easily occurs in steel pipe; 2, due to the artificial fault reason such as probing, well-digging, piling, will also result in above-mentioned pipeline damage and leakage phenomenon; 3, due to the such as natural disaster such as thunderbolt, also pipeline can be damaged. The maintenance activity accordingly, it would be desirable to carry out speedily carrying out rescue work.
Daily at pipeline is speedily carried out rescue work in maintenance work, when being replaced for standpipe, it is necessary to articulation place that user introduces tee T and standpipe that pipe place purges stake separates, and adopts pipe plug to be blocked at the top of tee T, namely allows user introduce pipe and standpipe isolation. User introduce the purging stake of pipe and tee T because of service life long, mopping causes the gap between tee T and standpipe to be painted to fill up repeatedly, cause articulation place to loosen, or force to cause other wire connection positions leak when dismantling, so cause closure speed slowly, the problem of weak effect.For this, generally all can adopt plugging device replace pipe plug, user is introduced pipe and standpipe keep apart, dismantle without to its loose joint place.
In order to ensure the safety of fuel gas transmission, after Pipe installing completes or after maintenance activity of speedily carrying out rescue work completes, standpipe is carried out pressure testing detection, it is ensured that its No leakage and with the safety of gas. Typically now suppressed by installation pressue device, voltage stabilizing a period of time, adopt the Pressure gauge reaching specification required precision to carry out pressure measurement, observe whether Pressure gauge blood pressure lowering phenomenon occurs, so that it is determined that whether standpipe is qualified.
But, present plugging device can only block, it is necessary to it is necessary to removed when carrying out pressure testing detection, there is certain safety work risk; Present pipeline is once there is leakage phenomenon, need to close combustion gas distribution arm, large area emptying, stop the supple of gas or steam for a long time, the scope of stopping the supple of gas or steam related to is wide, it is easy to national life and industry cause having a strong impact on, and it cannot be guaranteed that operation of quickly accurately speedily carrying out rescue work, when speedily carrying out rescue work operation, there is certain potential safety hazard.
Summary of the invention
The invention is intended to provide the device of a kind of combustion gas closure and standpipe pressure testing one and closure pressure-measuring method, reduce scope of stopping the supple of gas or steam, reduce maintenance activity risk of speedily carrying out rescue work the operation that ensures quickly accurately to speedily carry out rescue work.
The device of combustion gas closure in this programme and standpipe pressure testing one, base case is: include the support set of adjusting lever and hollow, and support set is enclosed within the outside of adjusting lever; Adjusting lever includes extension, linkage section and the swelling section that external diameter is sequentially reduced, and linkage section outer wall is provided with external screw thread, and the outer wall of swelling section is arranged with expansion sleeve, and the end of expansion arc is provided with anti-withdrawing nut; Support set includes extension and connecting portion, junction between extension and connecting portion is provided with locking screw, extension is sheathed on the extension of adjusting lever, and the free end of adjusting lever extension is positioned at outside extension, the connecting portion of support set is set on the linkage section of adjusting lever, and the connecting portion of support set is provided with the female thread that the linkage section with adjusting lever matches; Support set is provided with the through hole connected with standpipe, and the end thread of support set is connected to the rear enclosure of hollow structure, after be arranged with hollow joint.
Operation principle and beneficial effect: in this programme, 1, by extruding to expansion sleeve, make expansion sleeve and user introduce pipe place and purge the inwall interference fit of stake, combustion gas distribution arm and standpipe are separated, it is ensured that the closure to combustion gas distribution arm. 2, this programme offers through hole above support set, gas in standpipe is by the gap of support set with adjusting lever, standpipe, rear enclosure, hollow joint is made to be connected, while closure combustion gas distribution arm, standpipe is carried out independent pressure testing, without, before pressure testing, being disassembled by plugging device, decrease the risk of operation. 3, compared with prior art, directly single standpipe is carried out pressure testing, it is not necessary to closing combustion gas distribution arm, scope of stopping the supple of gas or steam is little, reduce combustion gas and speedily carry out rescue work maintenance activity to national life and industrial impact. 4, owing to being provided externally with locking screw at support set, when taking off pipe plug, support set is quickly rotated after the single tee T that support set front end can be inserted purging stake, the internal thread locking of the locking screw of support set and tee T top end, install quickly, easy to operate, it is ensured that operation of quickly accurately speedily carrying out rescue work. 5, this device is threadeded with tee T, in pressure testing process, enhances the performance bearing pressure, it is to avoid in pressure testing process, this device separates with tee T, thus enhancing the safety and stability of pressure testing.
Scheme 2, as the improvement to base case, adjusting lever is provided with pad between anti-back nut and expansion sleeve.So can strengthen contacting between anti-withdrawing nut and expansion sleeve, reduce gas leakage.
Scheme 3, as the improvement to base case, is provided with annular projection before locking screw, annular projection is provided with chamfering. After taking off pipe plug, it is necessary to quickly support set front end is inserted in tee T, annular projection arranges chamfering, it is possible to facilitate support set to insert, reduce gas leakage further.
Scheme 4, as the improvement to scheme 3, is provided with annular recess after support set upper annular projection, annular recess is arranged with O. In annular groove, sheathed O improves the sealing effectiveness that support set is threadeded with tee T, it is to avoid gas leakage.
Scheme 5, as the improvement to base case, the material of expansion sleeve is macromolecule new polyurethane. Macromolecule new polyurethane material has excellent temperature tolerance and wearability, and inexpensive being prone to is bought.
For the closure pressure-measuring method of combustion gas closure and the device of standpipe pressure testing one, base case is: comprise the following steps:
1) pipe plug that first user introduces the tee T top that pipe place purges stake is taken off, and is inserted in tee T by combustion gas closure and standpipe pressure testing device;
2) device of rotatable gas closure and standpipe pressure testing one, makes the internal thread locking of the locking screw outside support set and tee T top;
3) utilizing spanner to rotate adjusting lever, make adjusting lever move up, expansion sleeve is compressed by the anti-withdrawing nut above adjusting lever, makes expansion sleeve sectional area become big, and tee T, beyond the horizontal level at standpipe place, is blocked by the front end of adjusting lever;
4) joint above rear enclosure is closed, joint Pressure gauge installed above in rear enclosure and thermometer, close valve before the table that user is indoor, then suppress at standpipe pressue device installed above, meanwhile, before pressure testing, Pressure gauge is carried out verification qualified;
5) startup pressue device send and is depressed into 0.1MPa, and make a strength test detection, voltage stabilizing 2 hours, and Pressure gauge shows without pressure drop, it is determined that standpipe is qualified, and otherwise standpipe is defective;
6) after strength test detection, opening when pressue device valve is deflated to 0.03MPa and close valve, after isoequilibrium, manometric registration carries out leak test after stablizing again, voltage stabling control is 24 hours, Pressure gauge shows without pressure drop, it is determined that standpipe is qualified, and otherwise standpipe is defective;
7) open pressue device valve and be deflated to normal pressure, combustion gas closure and standpipe pressure testing device are disassembled from rotating above tee T, pipe plug is arranged on the top of tee T.
Beneficial effect: this method is compared with prior art, 1, by utilizing standpipe pressure testing device, the front end of adjusting lever is exceeded user and introduces the horizontal level that the tee T place of water stake is blown at pipe place, by expansion sleeve extruding is realized the plugging action to combustion gas distribution arm, and by through hole, standpipe, rear enclosure, hollow joint are connected, while closure combustion gas distribution arm, standpipe is carried out independent pressure testing, without, before pressure testing, being disassembled by plugging device, decrease the risk of operation. 2, compared with prior art, directly single standpipe is carried out pressure testing, it is not necessary to closing combustion gas distribution arm, scope of stopping the supple of gas or steam is little, reduce combustion gas and speedily carry out rescue work maintenance activity to national life and industrial impact. 3, owing to being provided externally with locking screw at support set, when taking off pipe plug, after the single tee T that support set front end can be inserted purging stake, support set is quickly rotated, the internal thread locking of the locking screw of support set and tee T top end, install quickly, easy to operate, reduce operating risk.4, the detection of the pressure testing in the program includes verification, strength test and leak test before pressure testing, and standpipe carries out pressure testing detection, pressure testing detection is complete, it is to avoid the defect of the pressure except leaking. 5, pressure testing is mounted with thermometer, it is ensured that the correspondence of pressure registration and residing temperature, it is to avoid test position is different and the error that produces, and pressure testing test reading is accurate.
Accompanying drawing explanation
Fig. 1 is the structural representation of the gas pipeline distribution of prior art;
Fig. 2 is the structural representation of embodiments of the invention.
Detailed description of the invention
Below by detailed description of the invention, the present invention is further detailed explanation:
Accompanying drawing labelling in Figure of description includes: building house 1, standpipe 2, and user introduces pipe 3, purges stake 31, tee T 32, pipe plug 33, combustion gas distribution arm 4, adjusting lever 5, extension 51, linkage section 52, swelling section 53, anti-withdrawing nut 6, pad 7, expansion sleeve 8, support set 9, extension 91, connecting portion 92, locking screw 10, hollow joint 11, through hole 12, rear enclosure 13.
As in figure 2 it is shown, the device of combustion gas closure and standpipe pressure testing one, including adjusting lever 5, adjusting lever 5 is divided into extension 51, linkage section 52 and swelling section 53 by front end to rear end, and the external diameter of extension 51, linkage section 52 and swelling section 53 is sequentially reduced. Adjusting lever 5 is solid construction, is arranged with anti-withdrawing nut 6, pad 7 and expansion sleeve 8 outside the swelling section 53 of adjusting lever 5 successively, and the material of expansion sleeve 8 is macromolecule new polyurethane, and anti-withdrawing nut 6 is threaded connection with adjusting lever 5 or welds. Support set 9 includes extension 91 and connecting portion 92, junction between extension 91 and connecting portion 92 is provided with locking screw 10, extension 91 is sheathed on the extension 51 of adjusting lever 5, and the end of adjusting lever 5 extension 51 is positioned at outside extension 91, the connecting portion 92 of support set 9 is set on the linkage section 52 of adjusting lever 5, and the connecting portion 92 of support set 9 is provided with the female thread that the linkage section 52 with adjusting lever 5 matches. Being provided with annular protrusion before support set 9, annular protrusion place is provided with chamfering, is provided with annular recess after support set 9 upper annular projection, and annular recess is arranged with O, reduces gas leakage. The lower end being positioned at locking screw 10 above support set 9 offers through hole 12, the top of support set 9 is threaded rear enclosure 13, rear enclosure 13 is arranged above with hollow joint 11, being provided with the pore connected with hollow joint 11 in rear enclosure 13, hollow joint 11 is installed above a Pressure gauge and two Celsius thermometer of testing pressure.
Embodiment, the closure pressure-measuring method of the device of combustion gas closure and standpipe pressure testing one, comprise the following steps,
1) pipe plug that first user introduces the tee T top that pipe place purges stake is taken off, and is inserted in tee T by described combustion gas closure and standpipe pressure testing device;
2) rotatable gas closure and standpipe pressure testing device, make the internal thread locking of the locking screw outside support set and tee T top;
3) utilizing spanner to rotate adjusting lever, make adjusting lever move up, expansion sleeve is compressed by the anti-withdrawing nut above adjusting lever, makes expansion sleeve sectional area become big, and tee T, beyond the horizontal level at standpipe place, is blocked by the front end of adjusting lever;
4) joint above rear enclosure is closed, joint Pressure gauge installed above in rear enclosure and thermometer, close valve before the table that user is indoor, then suppress at standpipe pressue device installed above, meanwhile, before pressure testing, Pressure gauge is carried out verification qualified;
5) startup pressue device send and is depressed into 0.1MPa, and make a strength test detection, voltage stabilizing 2 hours, and Pressure gauge shows without pressure drop, it is determined that standpipe is qualified, and otherwise standpipe is defective;
6) after strength test detection, opening when pressue device valve is deflated to 0.03MPa and close valve, after isoequilibrium, manometric registration carries out leak test after stablizing again, voltage stabling control is 24 hours, Pressure gauge shows without pressure drop, it is determined that standpipe is qualified, and otherwise standpipe is defective;
7) open pressue device valve and be deflated to normal pressure, combustion gas closure and standpipe pressure testing device are disassembled from rotating above tee T, pipe plug is arranged on the top of tee T.
Installation method: first the swelling section of adjusting lever stretched in support set, and stretch out the linkage section of support set, be inserted in expansion sleeve and pad in the periphery of swelling section successively, then connects anti-withdrawing nut in the end thread of swelling section; It follows that rear enclosure be connected with thread of supporting sleeves, hollow joint is directly installed on above rear enclosure.
Above-described is only embodiments of the invention, and in scheme, the general knowledge such as known concrete structure and/or characteristic does not do too much description at this. Should be understood that; for a person skilled in the art, under the premise without departing from present configuration, it is also possible to make some deformation and improvement; these also should be considered as protection scope of the present invention, and these are all without affecting effect of the invention process and practical applicability. The protection domain that this application claims should be as the criterion with the content of its claim, and the detailed description of the invention in description etc. records the content that may be used for explaining claim.
Claims (6)
1. the device of combustion gas closure and standpipe pressure testing one, including the support set of adjusting lever and hollow, described support set is enclosed within the outside of adjusting lever; Described adjusting lever includes extension, linkage section and the swelling section that external diameter is sequentially reduced, and described linkage section outer wall is provided with external screw thread, and the outer wall of described swelling section is arranged with expansion sleeve, and the end of expansion arc is provided with anti-withdrawing nut; Described support set includes extension and connecting portion, junction between described extension and connecting portion is provided with locking screw, extension is sheathed on the extension of adjusting lever, and the free end of adjusting lever extension is positioned at outside extension, the connecting portion of described support set is set on the linkage section of adjusting lever, and the connecting portion of support set is provided with the female thread that the linkage section with adjusting lever matches; It is characterized in that, described support set is provided with the through hole connected with standpipe, and the end thread of described support set is connected to the rear enclosure of hollow structure, is arranged with hollow joint after described.
2. the device of combustion gas closure according to claim 1 and standpipe pressure testing one, it is characterised in that: described adjusting lever is provided with pad between anti-back nut and expansion sleeve.
3. the device of combustion gas closure according to claim 1 and standpipe pressure testing one, it is characterised in that: being provided with annular projection before described locking screw, described annular projection is provided with chamfering.
4. the device of combustion gas closure according to claim 3 and standpipe pressure testing one, it is characterised in that: it is provided with annular recess after described support set upper annular projection, described annular recess is arranged with O.
5. the device of combustion gas closure according to claim 1 and standpipe pressure testing one, it is characterised in that: the material of described expansion sleeve is macromolecule new polyurethane.
6. for the closure pressure-measuring method of the combustion gas closure as described in any one of Claims 1 to 5 and standpipe pressure testing device, it is characterised in that comprise the following steps,
1) pipe plug that first user introduces the tee T top that pipe place purges stake is taken off, and is inserted in tee T by described combustion gas closure and standpipe pressure testing device;
2) device of rotatable gas closure and standpipe pressure testing one, makes the internal thread locking of the locking screw outside support set and tee T top;
3) utilizing spanner to rotate adjusting lever, make adjusting lever move up, expansion sleeve is compressed by the anti-withdrawing nut above adjusting lever, makes expansion sleeve sectional area become big, and tee T, beyond the horizontal level at standpipe place, is blocked by the front end of adjusting lever;
4) joint above rear enclosure is closed, joint Pressure gauge installed above in rear enclosure and thermometer, close valve before the table that user is indoor, then suppress at standpipe pressue device installed above, meanwhile, before pressure testing, Pressure gauge is carried out verification qualified;
5) startup pressue device send and is depressed into 0.1MPa, and make a strength test detection, voltage stabilizing 2 hours, and Pressure gauge shows without pressure drop, it is determined that standpipe is qualified, and otherwise standpipe is defective;
6) after strength test detection, opening when pressue device valve is deflated to 0.03MPa and close valve, after isoequilibrium, manometric registration carries out leak test after stablizing again, voltage stabling control is 24 hours, Pressure gauge shows without pressure drop, it is determined that standpipe is qualified, and otherwise standpipe is defective;
7) open pressue device valve and be deflated to normal pressure, combustion gas closure and standpipe pressure testing device are disassembled from rotating above tee T, pipe plug is arranged on the top of tee T.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610220793.7A CN105651472B (en) | 2016-04-11 | 2016-04-11 | The device and closure pressure-measuring method of combustion gas closure and standpipe pressure testing one |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610220793.7A CN105651472B (en) | 2016-04-11 | 2016-04-11 | The device and closure pressure-measuring method of combustion gas closure and standpipe pressure testing one |
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| Publication Number | Publication Date |
|---|---|
| CN105651472A true CN105651472A (en) | 2016-06-08 |
| CN105651472B CN105651472B (en) | 2018-08-03 |
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| CN201610220793.7A Active CN105651472B (en) | 2016-04-11 | 2016-04-11 | The device and closure pressure-measuring method of combustion gas closure and standpipe pressure testing one |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106768722A (en) * | 2017-01-06 | 2017-05-31 | 重庆燃气集团股份有限公司 | A kind of closure pressure testing device and closure pressure-measuring method suitable for mesohigh Gas Pipe |
| CN109780362A (en) * | 2017-11-11 | 2019-05-21 | 杨宏伟 | Pressure pipeline ball valve on-line production replaces tool |
| CN111350890A (en) * | 2018-12-20 | 2020-06-30 | 中核北方核燃料元件有限公司 | Device and method for hydraulic blasting detection of annular fuel assembly guide pipe |
| CN113720552A (en) * | 2021-08-13 | 2021-11-30 | 中山港华燃气有限公司 | Method for detecting leakage of commercial complex gas matching pipeline |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106768722A (en) * | 2017-01-06 | 2017-05-31 | 重庆燃气集团股份有限公司 | A kind of closure pressure testing device and closure pressure-measuring method suitable for mesohigh Gas Pipe |
| CN109780362A (en) * | 2017-11-11 | 2019-05-21 | 杨宏伟 | Pressure pipeline ball valve on-line production replaces tool |
| CN111350890A (en) * | 2018-12-20 | 2020-06-30 | 中核北方核燃料元件有限公司 | Device and method for hydraulic blasting detection of annular fuel assembly guide pipe |
| CN113720552A (en) * | 2021-08-13 | 2021-11-30 | 中山港华燃气有限公司 | Method for detecting leakage of commercial complex gas matching pipeline |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105651472B (en) | 2018-08-03 |
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