CN207675395U - Plug-in type drainage tube air tight test device - Google Patents

Plug-in type drainage tube air tight test device Download PDF

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Publication number
CN207675395U
CN207675395U CN201721910882.0U CN201721910882U CN207675395U CN 207675395 U CN207675395 U CN 207675395U CN 201721910882 U CN201721910882 U CN 201721910882U CN 207675395 U CN207675395 U CN 207675395U
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CN
China
Prior art keywords
drainage tube
gas
verifying attachment
pedestal
gas nozzle
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CN201721910882.0U
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Chinese (zh)
Inventor
李金榜
毛艳青
孙亚辉
邢爱祖
郭腾达
刘建华
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Power Polytron Technologies Inc
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Power Polytron Technologies Inc
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Priority to CN201721910882.0U priority Critical patent/CN207675395U/en
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Abstract

The utility model is related to air tightness detection equipment technical fields, specifically provide a kind of plug-in type drainage tube air tight test device.Plug-in type drainage tube air tight test device includes pedestal and the connecting line for being connect with the gas nozzle on drainage tube, pedestal is equipped with the plugging device of the opening corresponding with corresponding gas nozzle on the gas distribution pipe for blocking drainage tube, connecting line has the gas source interface for connect with negative pressure source or pressure source and the pressure retaining valve for controlling connecting line break-make, in the side of the separate gas source interface of pressure retaining valve equipped with pressure test device on connecting line.Verifying attachment in the utility model can test to the air-tightness of drainage tube, efficient, highly reliable.

Description

Plug-in type drainage tube air tight test device
Technical field
The utility model is related to air tightness detection equipment technical fields, and in particular to a kind of plug-in type drainage tube air-tightness inspection Experiment device.
Background technology
In the fields such as coal mining mine, in order to ensure the personal safety of operating personnel, generally require to the gas of underground into Row extraction and by Pipeline transport to setting destination, needed during gas drainage under suction through corresponding measuring instrument to pipe Gas in road is detected, however due to the limitation of ambient enviroment, often directly measuring instrument can not be connected with corresponding pipeline It connects, just needs to use drainage device in such cases.
Authorization Notice No. is CN202710580U, and authorized announcement date is that the Chinese patent of 2013.01.30 discloses a kind of insert Enter formula and take gas drain age-tube device, which includes taking tracheae, takes and is arranged with reducing sleeve at the inserted terminal of tracheae, and the other end fixes dress With the gas nozzle seat for being useful for connecting with corresponding tester, there are four gas nozzles for fixing assembling on gas nozzle seat, have specifically included three The gas nozzle that bore is φ 6 and a bore is φ 8 connects, the air inlet of each gas nozzle for gas connector corresponding on measuring instrument End is connected separately with conduit, and conduit, which is located at, to be taken in tracheae, and the front end of tracheae is taken to be additionally provided with gas distribution pipe, and gas distribution pipe includes four and gas Connection is connected with the gas distribution pipe in the corresponding opening of mouth, the one end of each conduit far from corresponding gas nozzle.
Plug-in type drainage tube is mounted in coal mine gas extraction pipeline, for acquiring pipeline Neva this gas pressure The information such as power, temperature, flow, concentration, and it is conducted into a kind of drainage device of corresponding instrument, to realize to gas drainage pipe The real-time monitoring in road.For can in real time, accurately acquire the various monitoring informations in gas tube, and ensure in gatherer process The risk of no methane gas leakage, the sealing performance of drainage tube play crucial effect, so ensureing that the drainage tube of manufacture is complete Portion reaches tightness and requires to seem particularly significant.
Utility model content
The purpose of this utility model is to provide a kind of plug-in type drainage tube air tight test devices, can be to drainage tube Air-tightness is tested, efficient, highly reliable.
To achieve the above object, plug-in type drainage tube air tight test device uses following technical side in the utility model Case:
1, plug-in type drainage tube air tight test device, the verifying attachment include pedestal and for the gas on drainage tube The connecting line of mouth connection, pedestal are equipped with the envelope of the opening corresponding with corresponding gas nozzle on the gas distribution pipe for blocking drainage tube Block apparatus, connecting line have gas source interface for being connect with negative pressure source or pressure source and for controlling connecting line break-make Pressure retaining valve is equipped with pressure test device on connecting line in the side of the separate gas source interface of pressure retaining valve.
Advantage is:Be provided with pedestal in a device, improve integrated level, make each component can integrated installation exist On pedestal, it is provided with the plugging device to gas distribution pipe on pedestal, can ensure the leakproofness of drainage tube one end, connecting line energy Tracheae pump gas or vacuum state into drainage tube are enough connected, one can be formed inside drainage tube surely with pressure retaining valve cooperation Fixed pressure environment, if leaking, pressure test device then can prompt technical staff's drainage tube by intuitively reading Air-tightness do not reach requirement, the step of detection process is operated, is few, efficient, and by be arranged plugging device and Pressure test device improves the reliability of inspection.
2, on the basis of 1, the verifying attachment further includes the clamping part that drainage tube is clamped, the clamping part packet It includes the first clamping part being supported to the gas distribution pipe of drainage tube and inserted terminal one end far from drainage tube is used for drainage tube The second clamping part for being supported of peripheral surface.
Advantage is:It is provided with the clamping part that drainage tube is clamped in a device, ensure that and detecting Because vibrating to influence the stability of drainage tube for air source generation, ensure that the accuracy of detection, and draining respectively in journey The side of the gas distribution pipe of pipe and separate gas distribution pipe is supported, and two supporting points can ensure the support effect to drainage tube.
3, on the basis of 2, the pedestal, which is equipped with, is used to support the supporting table of gas distribution pipe, the supporting table be equipped with The mounting groove that the inserted terminal periphery facial contour of drainage tube coincide for accommodating the inserted terminal, the first clamping part is by the mounting groove It is formed.
Advantage is:First clamping part is set as supporting table, drainage tube can be raised and increase technical staff's Mounting groove is set as coincideing with the periphery facial contour of inserted terminal by operating space, and mounting groove is provided in supporting table Shape, higher with the compactness of inserted terminal, bearing area is larger to carry out good support to inserted terminal.
4, on the basis of 3, the supporting table is equipped with the clamp blocked to the gas distribution pipe of drainage tube, the clamp Top splenium be arranged in the top of the mounting groove.
Advantage is:The clamp being sealed to gas distribution pipe is provided in supporting table, the top splenium of clamp is set It sets in the top of mounting groove, can top pressure sealing be carried out to gas distribution pipe in the vertical direction, arrangement is reasonable, not will produce dry It relates to, and clamp belongs to quick-speed jigs, technology maturation is realized convenient for technical staff in this programme, and the chucking power of clamp is larger It is preferable to the sealing effect of gas distribution pipe.
5, on the basis of any one of 2-4, second clamping part is the fixed plate arranged vertically, is opened in fixed plate Equipped with the centre bore worn for drainage tube, the hole wall of the centre bore forms the supporting surface being supported to drainage tube.
Advantage is:Second clamping part is the fixed plate equipped with centre bore, can raise and wait for supporting table cooperation The drainage tube of survey, improves the operating space of technical staff, and centre bore pair can carry out block with the peripheral surface of drainage tube The fixation to drainage tube is realized in cooperation.
6, on the basis of 5, side of the fixed plate far from the first clamping part is equipped with and the coaxial cloth of the centre bore The reentrant cylindrical cavity of the gas nozzle seat for supporting drainage pipe is set, the radial dimension of the reentrant cylindrical cavity is more than the gas of drainage tube The radial dimension of mouth seat.
Advantage is:It is provided with reentrant cylindrical cavity in fixed plate, the gas nozzle seat of drainage tube can be matched Close, gas nozzle seat is supported, bearing area is increased, ensure that installation strength of the drainage tube on the first and second clamping part and Rigidity.
7, on the basis of 6, the centre bore of the fixed plate is coaxially disposed with the mounting groove.
Advantage is:The centre bore of fixed plate and mounting groove are coaxially disposed, enable drainage tube along level side It to being placed on the tablet of pedestal, is detected convenient for technical staff, and reduces the inspection generated by placement form and miss Difference.
8, on the basis of 1, the connecting line is equipped with and is connected to air source for switching the gas nozzle of 8 bore of φ 6 or φ Switching valve and the adapter being arranged between gas nozzle and switching valve.
Advantage is:Be provided with switching valve, switching valve can realize the break-make of different pipelines, on drainage tube not Gas nozzle with bore coordinates, and carrys out change detection pipeline convenient for technical staff, efficiency is higher, and in switching valve and drainage tube gas nozzle Between be provided with adapter, can ensure leakproofness, reduce because device itself leakage caused by examine error.
9, on the basis of 8, the pressure test device is pressure gauge.
Advantage is:Pressure gauge reading is intuitive, is observed convenient for technical staff.
10, on the basis of 1, the pedestal is equipped with the vacuum pump as negative pressure source.
Advantage is:Air source is set as vacuum pump, vacuum pump can be evacuated into drainage tube, make shape in drainage tube At a vacuum environment, at this time energetically pressure can outside pushing tow plugging device, leakproofness is ensure that, if avoiding into drainage tube Pump gas, drainage tube interior gas pushing tow plugging device cause poorly sealed problem, improve the accuracy of inspection.
11, on the basis of 7, the pedestal is equipped with the tablet on the top surface of pedestal, the supporting table and fixation Plate is arranged on the top surface of tablet.
Advantage is:It is provided with the plane installed for clamping part on device, tests behaviour for technical staff A platform space is provided, the practicability of device is increased.
12, on the basis of 1, the side of the pedestal is equipped with handle.
Advantage is:On pedestal be equipped with handle, convenient for technical staff by device be moved to suitable position into Performing check works
13, on the basis of 1 or 12, the bottom surface of the pedestal is equipped with stabilizer blade, and the stabilizer blade is made of rubber material.
Advantage is:On the bottom surface of pedestal be equipped with stabilizer blade, can in checkout procedure other component generate Vibration absorbed, avoid because vibration and the problem of influence leakproofness, improve the precision of detection.
Description of the drawings
Fig. 1 is the assembling schematic diagram of plug-in type drainage tube air tight test device and drainage tube in the utility model;
Fig. 2 is the schematic diagram of plug-in type drainage tube air tight test device and drainage tube cooperation in the utility model.
In figure:1. drainage tube;2. fixed plate;3. supporting table;4. gas nozzle;5. switching valve;6. clamp;7. silicone tube;8. pressure Power table;9. pressure retaining valve;10. pedestal;11. vacuum pump;12. three-way pipe;13.PU is managed;14. adapter;15. Switching Power Supply;16. pressure Power table adapter;17. hexagon thin nut;18. screw assembly;19. bolt;20. handle;21. waterproof connector;22. power cord; 23. stabilizer blade;24. fixing screws;25. hex nut;26. gas nozzle seat;27. muffler.
Specific implementation mode
As shown in Figure 1 to Figure 2, it is the specific embodiment of plug-in type drainage tube air tight test device in the utility model: Plug-in type drainage tube air tight test device includes a box pedestal 10, is provided with to drainage tube on the tablet of pedestal 10 1 connecting line for being sealed the clamping part of clamping and connecting drainage tube 1 with air source further includes the gas distribution pipe to drainage tube 1 The plugging device blocked can ensure the leakproofness inside drainage tube 1, just in the case where drainage tube 1 is fixed Stress reduction is generated in drainage tube 1 in technical staff, and is let out by observing the variation of air pressure to judge that drainage tube whether there is Leakage, to test to the air-tightness of drainage tube 1.
Wherein, clamping part includes that second be arranged in first clamping part on 10 right side of pedestal and separate first clamping part is arranged Clamping part, the first clamping part are the supporting table 3 that top is provided with mounting groove, the outer profile of mounting groove and the inserted terminal of drainage tube 1 It coincide, the inserted terminal of drainage tube 1 can be supported.Rectilinear clamp 6 is equipped with by screw assembly 18 close to mounting groove, Rubber stopper in clamp 6 is arranged in a vertical direction, can be perpendicular to the inserted terminal peripheral surface of drainage tube 1, and to being distributed on grafting The gas distribution pipe of end peripheral surface is blocked, and the sealing to gas distribution pipe is realized, in addition, supporting table 3 passes through the planar base from pedestal The bolt 19 worn is fixed on the tablet of pedestal 10.
Second clamping part is the fixed plate 2 being screwed onto on tablet, and fixed plate 2 is arranged perpendicular to tablet, and in fixed plate 2 Center at be provided with the centre bore worn for drainage tube 1, offer radial ruler in the side of the gas nozzle seat 26 close to drainage tube 1 The very little reentrant cylindrical cavity slightly larger than gas nozzle seat 26, reentrant cylindrical cavity is coaxially arranged with centre bore, and gas nozzle seat 26 can be made in cylinder Rotation in shape cavity.The axis of mounting groove overlaps setting with the axis of 2 centre bore of fixed plate in supporting table 3, makes the first clamping part It can be horizontally-supported by drainage tube 1 with the second clamping part.
The downside of tablet is provided with the connecting line of connection drainage tube and extraneous air source, including is arranged above and below tablet The adapter 14 of pressure retaining valve 9, switching valve 5 on two sides and the two different caliber sizes connected from switching valve 5.Pressure retaining valve 9, switching valve 5 and from switching valve 5 connect two different caliber sizes adapter 14 by PU pipes 13 connection, be all disposed within flat The lower section of plate, adapter 14 are arranged by hex nut 25 in the top of tablet.It is fixedly installed in the internal backplane of pedestal 10 The Switching Power Supply 15 for having the vacuum pump 11 as extraneous air source and being connect with vacuum pump, vacuum pump 11 are connected with muffler 27, The side for being provided with Switching Power Supply 15 is provided with the power cord 22 being connect with Switching Power Supply 15, and power cord 22 passes through waterproof connector 21 It is inserted on the side of pedestal 10.
It in connecting line, is connected using PU pipes 13 between vacuum pump 11 and the air inlet of pressure retaining valve 9, pressure retaining valve 9 goes out There are one three-way pipe 12, other two interface of three-way pipe 12 is connected separately with switching valve 5 and pressure gauge 8, pressure for gas port connection Table 8 is plugged in by pressure gauge adapter 16 and hexagon thin nut 17 on the upper side of tablet.Gas circuit along arrangement is advanced, gas Road enters from the air inlet of switching valve 5, and there are two gas outlets for switching valve 5, and it is turning for φ 8 and φ 6 to be connected separately with caliber size The outlet of the adapter of connector 14, φ 8 and φ 6 is respectively arranged with the silicone tube 7 of φ 8 and φ 6, with the φ 8 and φ on drainage tube 1 6 gas nozzle 4 corresponds to.
In the bottom surface of pedestal 10, there are four the stabilizer blade 23 for being located at corner, stabilizer blade 23 is pyramidal structure wide at the top and narrow at the bottom for setting, Good support can be carried out to pedestal 10, and stabilizer blade 23 is rubber parts, is lifted on by bolt on the bottom surface of pedestal 10.Separately Outside, it is equipped with by fixing screws 24 on two sides of pedestal 10 and moves the handle of the device for holding to hold for technical staff 20。
Drainage tube is carried out using the plug-in type drainage tube air tight test device in the utility model in technical staff When air tight test, the present apparatus is first placed into place easy to operation, then observes gas nozzle and gas distribution pipe in drainage tube 1 again Correspondence enables four gas nozzles 4 of drainage tube 1 and four gas distribution pipes being arranged on the peripheral surface of inserted terminal to pass through in pipe Four gas circuits be respectively turned on, during being detected to its air-tightness ensure gas nozzle and gas distribution pipe one-to-one correspondence.
Setting is there are four gas nozzle 4 corresponding with gas circuit in pipe on the gas nozzle seat 26 of drainage tube 1, wherein three gas nozzles 4 Bore is φ 6, and the bore of a gas nozzle 4 is φ 8, thus in a device setting there are two the adapter 14 of different caliber sizes with The gas nozzle 4 of φ 6 or φ 8 is respectively connected with.
In clamping drainage tube 1, first the inserted terminal of drainage tube 1 is passed through the centre bore of fixed plate 2, mobile drainage tube 1 make Its inserted terminal is resisted against in the mounting groove in supporting table 3, and drainage tube 1 is rotated between centre bore and supporting table 3, makes drainage For the gas distribution pipe of the peripheral surface of the inserted terminal of pipe 1 close to the rubber stopper of clamp 6, adjusting inserted terminal makes rubber stopper be in gas distribution pipe It is when straight line, drainage tube 1 is whole to close to the movement of the side of clamp 6, so that inserted terminal is completely fixed in the installation of supporting table 3 In slot, the gas nozzle seat 26 of drainage tube 1 is then enable to be fully sunk in the reentrant cylindrical cavity in fixed plate 2, accordingly, clamp 6 rubber stopper is located at the surface of gas distribution pipe, center hole wall in fixed plate 2, in the cavity wall and supporting table 3 of reentrant cylindrical cavity Mounting groove forms the support construction to drainage tube 1.
After the completion of 1 clamping of drainage tube, the gas distribution pipe of 1 inserted terminal of drainage tube is compressed using clamp 6, realization pair The closure of gas distribution pipe seals, and the adapter 14 that bore is φ 8 is then passed through 8 bores of φ on silicone tube 7 and gas nozzle seat 26 Gas nozzle 4 connects, then the gas nozzle 4 that the adapter 14 that bore is φ 6 is φ 6 with any one bore on gas nozzle seat 26 is attached.
First the gas nozzle 4 to φ 8 on gas nozzle seat 26 and its corresponding gas circuit carry out hermetic seal inspection, gas distribution corresponding with φ 8 Pipe ensures sealing, controls switching valve 5, so that it is connected to the realization of the gas nozzle 4 of φ 8, then opens pressure retaining valve 9 again, and connect switch Power supply 15 opens the switch of vacuum pump 11, vacuum pump 11 is made to start to cause vacuum environment into drainage tube 1.
As shown in Fig. 2, the pressure gauge 8 in the present apparatus can read the air pressure in drainage tube 1, when the reading of pressure gauge 8 reaches To measurement requirement when, first close vacuum pump 11 switch, make vacuum pump 11 stop pumping, then turn off pressure retaining valve 9, make to draw Flow tube 1 is in the state of a sealing, and pressure gauge 8 is connected to drainage tube 1, still is able to read the barometer reading in drainage tube 1, etc. After the stable reading of pressure gauge 8, judge that drainage tube 1 whether there is leakage phenomenon by the variation of reading, if there is leakage, then It is gone to judge whether leakage rate satisfies the criteria according to reading.
When φ 84 corresponding gas circuit of gas nozzle complete examine after, need to be left three φ 64 corresponding gas circuit of gas nozzle into Performing check first opens clamp 6, the 4 corresponding gas circuit of gas nozzle of φ 8 is made to deflate, then that drainage tube 1 is whole to far from clamp 6 side movement, then rotates drainage tube 1 in centre bore and mounting groove, enable gas distribution pipe in gas circuit to be detected with The rubber stopper seal of clamp 6 coordinates, and then drainage tube 1 is completely fixed in supporting table 3 and fixed plate 2 again.
First rotate switching valve 5, make switching valve 5 be connected to φ 64 corresponding gas circuit of gas nozzle, then repeat above-mentioned pump gas and Observation of steps judge the gas circuit with the presence or absence of leakage.
When the detection for the 4 corresponding gas circuit of gas nozzle for completing a φ 6, technical staff can directly pull up and be connected to gas nozzle On silicone tube 7, the gas circuit then replaced on another gas nozzle 4 to be measured, and be connected to according to gas nozzle 4 to be measured changes folder The gas distribution pipe that pincers 6 are sealed.Above-mentioned checking procedure is repeated until four gas nozzles 4 are all completed to examine.
In other embodiments, it can also be not provided with switching valve, but technical staff is relied on to adjust φ 8 and φ 6 manually The gas nozzle of bore connects corresponding pipeline.
In other embodiments, pressure gauge may be replaced by other forms, such as pressure gauge is replaced with digital display type pressure Power meter.
In other embodiments, it can also be not provided with vacuum pump in verifying attachment, and be equipped with the connector being connect with vacuum pump, Using other external gas generating units gas is provided for detection work.
In other embodiments, vacuum pump may be replaced by other forms, such as vacuum pump is substituted for as pressure The inflator pump of source pump gas into drainage tube.
In other embodiments, mounting groove can also be not provided in supporting table.
In other embodiments, it can also come to block the gas distribution pipe of drainage tube inserted terminal into shape without using clamp and seal, But gas distribution pipe is blocked using rubber stopper by technical staff.
In other embodiments, reentrant cylindrical cavity can also be not provided in fixed plate.
In other embodiments, the mounting groove on the centre bore and supporting table of fixed plate can also be staggeredly arranged.
In other implementation roads, it can also be not provided with tablet in pedestal, clamping part and connecting line are arranged in pedestal Portion.

Claims (13)

1. plug-in type drainage tube air tight test device, it is characterised in that:The verifying attachment includes pedestal and is used for and drainage The connecting line of gas nozzle connection on pipe, pedestal are equipped with corresponding with corresponding gas nozzle on the gas distribution pipe for blocking drainage tube The plugging device of opening, connecting line have gas source interface for being connect with negative pressure source or pressure source and for controlling connecting tube The pressure retaining valve of road break-make is equipped with pressure test device on connecting line in the side of the separate gas source interface of pressure retaining valve.
2. verifying attachment according to claim 1, it is characterised in that:The verifying attachment further includes being pressed from both sides to drainage tube The clamping part held, the clamping part include the first clamping part being supported to the gas distribution pipe of drainage tube and to far from drainage tube The second clamping part that inserted terminal one end is used to be supported the peripheral surface of drainage tube.
3. verifying attachment according to claim 2, it is characterised in that:The pedestal is equipped with the branch for being used to support gas distribution pipe Platform is supportted, the supporting table is equipped with the installation being coincide with the inserted terminal periphery facial contour of drainage tube for accommodating the inserted terminal Slot, the first clamping part are formed by the mounting groove.
4. verifying attachment according to claim 3, it is characterised in that:The supporting table is equipped with the gas distribution pipe to drainage tube The top splenium of the clamp blocked, the clamp is arranged in the top of the mounting groove.
5. according to the verifying attachment described in any one of claim 2-4, it is characterised in that:Second clamping part is vertical cloth The fixed plate set, offers the centre bore worn for drainage tube in fixed plate, and the hole wall of the centre bore is formd to drainage The supporting surface that pipe is supported.
6. verifying attachment according to claim 5, it is characterised in that:On side of the fixed plate far from the first clamping part Equipped with the reentrant cylindrical cavity with the coaxially arranged gas nozzle seat for supporting drainage pipe of the centre bore, the reentrant cylindrical cavity Radial dimension is more than the radial dimension of the gas nozzle seat of drainage tube.
7. verifying attachment according to claim 6, it is characterised in that:The centre bore of the fixed plate is coaxially set with mounting groove It sets.
8. verifying attachment according to claim 1, it is characterised in that:The connecting line be equipped with for switch φ 6 or The switching valve and the adapter being arranged between gas nozzle and switching valve that the gas nozzle of 8 bores of φ is connected to air source.
9. verifying attachment according to claim 8, it is characterised in that:The pressure test device is pressure gauge.
10. verifying attachment according to claim 1, it is characterised in that:The pedestal is equipped with the vacuum as negative pressure source Pump.
11. verifying attachment according to claim 7, it is characterised in that:The pedestal is equipped on the top surface of pedestal Tablet, the supporting table and fixed plate are arranged on the top surface of tablet.
12. verifying attachment according to claim 1, it is characterised in that:The side of the pedestal is equipped with handle.
13. the verifying attachment according to claim 1 or 12, it is characterised in that:The bottom surface of the pedestal is equipped with stabilizer blade, institute Stabilizer blade is stated to be made of rubber material.
CN201721910882.0U 2017-12-30 2017-12-30 Plug-in type drainage tube air tight test device Active CN207675395U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201721910882.0U CN207675395U (en) 2017-12-30 2017-12-30 Plug-in type drainage tube air tight test device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201721910882.0U CN207675395U (en) 2017-12-30 2017-12-30 Plug-in type drainage tube air tight test device

Publications (1)

Publication Number Publication Date
CN207675395U true CN207675395U (en) 2018-07-31

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201721910882.0U Active CN207675395U (en) 2017-12-30 2017-12-30 Plug-in type drainage tube air tight test device

Country Status (1)

Country Link
CN (1) CN207675395U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111829734A (en) * 2020-07-15 2020-10-27 广船国际有限公司 Collection defence area tuber pipe gas tightness verifying attachment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111829734A (en) * 2020-07-15 2020-10-27 广船国际有限公司 Collection defence area tuber pipe gas tightness verifying attachment

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