CN109854818B - A sealed pipeline elastic penetration vibration isolation device - Google Patents
A sealed pipeline elastic penetration vibration isolation device Download PDFInfo
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- CN109854818B CN109854818B CN201910041120.9A CN201910041120A CN109854818B CN 109854818 B CN109854818 B CN 109854818B CN 201910041120 A CN201910041120 A CN 201910041120A CN 109854818 B CN109854818 B CN 109854818B
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Abstract
本发明公开了一种密封式管路弹性穿舱隔振装置，包括支撑管体、设于支撑管体内部的隔振组件，以及分设于隔振组件两侧的挡环和环形密封板；所述支撑管体外套设有焊接管体，焊接管体的外壁与船舱的舱壁固定相连；所述隔振组件同轴套设于穿舱的管路上，隔振组件的外端与挡环的内侧面压紧，挡环与管路相连；挡环的外侧面设环形密封板，环形密封板的内周面与管路的外壁紧贴；所述环形密封板的内沿与挡环固定相连，环形密封板的外沿与支撑管体的端面连接。本发明的有益效果为：本发明能够实现隔舱密封保护，具有一定的自限位与位移补偿能力。
The invention discloses a sealed pipeline elastic penetration vibration isolation device, comprising a support pipe body, a vibration isolation assembly arranged inside the support pipe body, a retaining ring and an annular sealing plate respectively disposed on both sides of the vibration isolation assembly; The outer wall of the support pipe body is provided with a welded pipe body, and the outer wall of the welded pipe body is fixedly connected with the bulkhead of the cabin; the vibration isolation assembly is coaxially sleeved on the pipeline passing through the cabin, and the outer end of the vibration isolation assembly is connected to the baffle ring. The inner side is pressed tightly, and the baffle ring is connected with the pipeline; the outer side of the baffle ring is provided with an annular sealing plate, and the inner peripheral surface of the annular sealing plate is in close contact with the outer wall of the pipeline; the inner edge of the annular sealing plate is fixedly connected with the baffle ring , the outer edge of the annular sealing plate is connected with the end face of the supporting pipe body. The beneficial effects of the invention are as follows: the invention can realize the sealing protection of the compartment, and has certain self-limiting and displacement compensation capabilities.
Description
The technical field is as follows:
the invention belongs to the pipeline vibration noise control technology in the field of ship construction, and particularly relates to a sealed pipeline elastic cabin-penetrating vibration isolation device.
Background
The pipeline penetration piece is a connecting piece which is used for enabling pipelines to penetrate through a deck, a cabin cabinet, a bulkhead and the like of a ship body and enables the pipelines to keep respective sealing. In a pipeline system of a ship, pipes need to pass through a bulkhead, and in order to maintain the strength, the sealing performance and the maintainability of the pipes, cabin penetrating parts are usually welded on the bulkhead through holes so as to connect the pipes at two ends of the bulkhead.
The vibration noise transmitted by the system pipeline to the ship body through the cabin penetrating piece when the system pipeline penetrates through the cabin or the ship body is one of main vibration transmission channels of electromechanical equipment of the ship. The current ship pipeline penetration basically adopts a rigid connection mode, a mode that flexible connecting pipes are connected at two ends after the rigid connection mode, or an elastic element is filled between a sleeve penetrating through a bulkhead and a pipeline. The mode of rigid connection, the vibration of system pipeline and the vibration of intraductal fluid medium all can transmit to hull through crossing cabin spare. The mode that two ends of the pipeline are connected with flexible connecting pipes can isolate the structural vibration of the pipe wall, but cannot isolate the pulsation excitation of the pipe wall by the fluid medium, and then the vibration of the bulkhead is excited through the rigid connecting part; the mode of filling the vibration isolation elastic element between the sleeve penetrating through the bulkhead and the pipeline can isolate the structural vibration of the pipe wall and the excitation of fluid medium, but has the problems of sealing of an elastomer compartment, weak displacement compensation capability of the compartment penetrating element, no treatment measures when the axial deformation and the radial deformation of the elastomer are too large, low use reliability and the like.
Disclosure of Invention
The invention aims to provide a sealed pipeline elastic cabin-penetrating vibration isolation device aiming at the defects of the prior art, which makes full use of the axial size of a pipeline system and solves the problems of insufficient sealing and poor displacement compensation capability in the prior art.
The technical scheme adopted by the invention is as follows: an elastic cabin-crossing vibration isolation device for a sealed pipeline comprises a supporting pipe body, a vibration isolation assembly arranged in the supporting pipe body, and baffle rings and annular sealing plates which are respectively arranged on two sides of the vibration isolation assembly; the outer wall of the welding pipe body is fixedly connected with the cabin wall of the cabin; the vibration isolation assembly is coaxially sleeved on a cabin-penetrating pipeline, the outer end of the vibration isolation assembly is tightly pressed against the inner side surface of the baffle ring, and the baffle ring is connected with the pipeline; the outer side surface of the baffle ring is provided with an annular sealing plate, and the inner circumferential surface of the annular sealing plate is tightly attached to the outer wall of the pipeline; the inner edge of the annular sealing plate is fixedly connected with the retaining ring, and the outer edge of the annular sealing plate is connected with the end face of the supporting pipe body.
According to the scheme, the annular sealing plate is of a sawtooth structure or a corrugated structure integrally.
According to the scheme, the annular sealing plate is made of rubber materials.
According to the scheme, the vibration isolation assembly comprises a primary vibration isolation group and a plurality of secondary vibration isolation groups which are symmetrically distributed on two sides of the primary vibration isolation group by taking the primary vibration isolation group as a center.
According to the scheme, the primary vibration isolation group comprises a primary elastic vibration isolation piece; the secondary vibration isolation set comprises a stepped sleeve and a plurality of secondary elastic vibration isolation parts, the end parts of the two stepped sleeves respectively arranged at two sides of the primary vibration isolation part are spliced, the middle parts of the two stepped sleeves form an annular groove, the primary elastic vibration isolation part is arranged in the annular groove, and the peripheral surface of the primary elastic vibration isolation part is tightly pressed with the annular groove; the second-stage elastic vibration isolation piece is arranged on the stepped sleeve, and the peripheral surface of the second-stage elastic vibration isolation piece is tightly attached to the inner wall surface of the supporting pipe body.
According to the scheme, the primary elastic vibration isolation piece and the secondary elastic vibration isolation piece are both of elastic annular structures and are made of nitrile rubber materials.
According to the scheme, the first-stage elastic vibration isolation piece and the second-stage elastic vibration isolation piece are respectively provided with crossed blind holes uniformly and axially.
According to the scheme, a flange A is processed on the outer surface of the welding pipe body, and a circle of threaded holes are processed on the flange A; the outer surface of the supporting pipe body is provided with a flange B corresponding to the flange A in position, a circle of unthreaded holes are formed in the flange B, and the flange A is connected with the flange B through a threaded connecting piece.
According to the scheme, the pipeline on the outer side of the annular sealing plate is provided with the threaded flange.
The invention has the beneficial effects that:
1. the elastic cabin-penetrating vibration isolation device for the pipeline can realize sealing protection of a compartment: when water enters the cabin at one side, the annular sealing plate is pressed and then tightly attached to the baffle ring, and the annular sealing plate and the baffle ring are tightly attached when the pressure is higher, so that water flow can be effectively prevented from entering the equipment; compared with the traditional cabin penetrating piece, the safety and the reliability of the pipeline system are improved;
2. the elastic cabin-crossing vibration isolation device for the pipeline has certain self-limiting and displacement compensation capabilities: under the working condition, the pipeline is allowed to have certain axial and radial displacement, and the requirement of installation and adjustment can be met; when the axial displacement of the pipeline is overlarge, the elastic vibration isolation element is compressed, and the stepped sleeve is contacted with the baffle ring to play a role in mechanical limit; the end face of the baffle ring is tightly attached to the secondary elastic vibration isolation element, so that the elastic vibration isolation element can be always in a working position relative to the pipeline, and the axial movement of the elastic vibration isolation element is prevented; meanwhile, the annular sealing plate is provided with folds (namely, the annular sealing plate is designed to be of a sawtooth-shaped or corrugated structure), so that certain displacement compensation can be provided, and the annular sealing plate is prevented from being excessively deformed and torn or plastically deformed when the pipeline is displaced;
3. the elastic cabin-penetrating vibration isolation device for the pipeline changes rigid connection between a pipeline system and a cabin wall into elastic connection: the elastic elements are connected in series in a multistage manner, the elastic elements with the cavity structures can effectively reduce the dynamic-static ratio of the rubber vibration isolation system, can realize nonlinear change of rigidity when being extruded to deform, have vibration isolation performance superior to that of a traditional pipeline system cabin penetrating piece, can effectively isolate transmission of pipeline vibration and noise to a hull structure, and improve vibration isolation and noise reduction performance of a ship;
4. the elastic cabin-crossing vibration isolation device for the pipeline adopts a multistage series vibration isolation mode, can fully utilize the existing axial design space, is arranged in multistage in the axial direction, flexibly designs the series stages, and reduces the size of a cabin wall opening; the single-stage elastic element can be further subjected to topological optimization of the overall dimension and the through holes and the blind holes, so that a better vibration isolation effect is obtained;
5. the elastic cabin-crossing vibration isolation device for the pipeline is convenient to weld and simple to disassemble and assemble: the welded pipe body is welded with the bulkhead before installation, other components except the welded pipe body are assembled before the upper ship and are assembled as a whole, and the welded pipe body is connected with the flange on the welded pipe body through the supporting pipe body. This kind of design is convenient for the dismouting to can effectively avoid welded heat transfer to the body inside and then influence elastic element's performance.
Drawings
FIG. 1 is an overall assembled cross-sectional view of one embodiment of the present invention.
Wherein: 1-a threaded flange; 2-pipeline; 3-pressing a ring; 4-a threaded connection; 5-an annular sealing plate; 6-baffle ring; 7-a bulkhead; 8-a primary elastic vibration isolation element; 9-stepped sleeve; 10-a secondary elastic vibration isolation element; 11-welding the pipe body; 12-a sealing gasket; 13-supporting the tubular body.
Detailed Description
For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
The sealed pipeline elastic cabin-crossing vibration isolation device shown in fig. 1 comprises a supporting pipe body 13, a vibration isolation assembly arranged inside the supporting pipe body 13, and a baffle ring 6 and an annular sealing plate 5 which are respectively arranged at two sides of the vibration isolation assembly; the support pipe body 13 is sleeved with a welding pipe body 11, and the outer wall of the welding pipe body 11 is fixedly connected (can be welded) with the cabin wall 7 of the cabin; the vibration isolation assembly is coaxially sleeved on the cabin-penetrating pipeline 2, the outer end of the vibration isolation assembly is tightly pressed with the inner side surface of the baffle ring 6, and the baffle ring 6 is connected with the pipeline 2 (can be in threaded fit); an annular sealing plate 5 is arranged on the outer side surface of the baffle ring 6, and the inner circumferential surface of the annular sealing plate 5 is tightly attached to the outer wall of the pipeline 2; the inner edge of the annular sealing plate 5 is fixedly connected with the baffle ring 6 through the threaded connecting piece 4, and the outer edge of the annular sealing plate 5 is connected with the end face of the supporting pipe body 13 through the threaded connecting piece 4.
Preferably, the annular sealing plate 5 has a zigzag or corrugated structure as a whole, and in particular, the radial section of the annular sealing plate 5 has a zigzag or corrugated shape.
Preferably, the annular sealing plate 5 is made of rubber material; the baffle ring 6 is a metal piece.
Preferably, the vibration isolation assembly comprises a primary vibration isolation group and a plurality of secondary vibration isolation groups which are symmetrically distributed on two sides of the primary vibration isolation group by taking the primary vibration isolation group as a center. Preferably, said primary vibration-isolating group comprises primary elastic vibration-isolating members 8; the secondary vibration isolation set comprises a stepped sleeve 9 and a plurality of secondary elastic vibration isolation parts 10, the end parts of the two stepped sleeves 9 respectively arranged at the two sides of the primary vibration isolation part are spliced, an annular groove is formed in the middle of each stepped sleeve 9, the primary elastic vibration isolation part 8 is arranged in the annular groove, and the peripheral surface of the primary elastic vibration isolation part 8 is tightly pressed with the annular groove; the secondary elastic vibration isolating member 10 is provided on the stepped sleeve 9, and the outer peripheral surface of the secondary elastic vibration isolating member 10 is closely attached to the inner wall surface of the support pipe body 13. Preferably, the primary elastic vibration isolation member and the secondary elastic vibration isolation member 10 are both elastic ring structures and made of nitrile rubber materials; the first-stage elastic vibration isolation piece and the second-stage elastic vibration isolation piece 10 are respectively provided with blind holes which are uniformly distributed and crossed along the axial direction, and the nonlinear change of rigidity can be realized. In this embodiment, a gap is left between the stepped sleeve 9 and the pipeline 2.
Preferably, a flange A is processed on the outer surface of the welding pipe body 11, and a circle of threaded holes are processed on the flange A; a flange B corresponding to the flange A is processed on the outer surface of the supporting pipe body 13, a circle of unthreaded holes are processed on the flange B, and the flange A is connected with the flange B through a threaded connecting piece 4; and a circle of threaded holes are formed in the end faces of the two ends of the supporting pipe body 13 at intervals in the circumferential direction and used for connecting the annular sealing plate 5.
Preferably, the pipeline 2 outside the annular sealing plate 5 is provided with a threaded flange 1, and specifically, the two ends of the pipeline 2 are provided with external threads; the inner ring of the threaded flange 1 is correspondingly provided with internal threads.
In this embodiment, the inner surface of the baffle ring 6 is provided with an internal thread adapted to the outer wall of the pipeline 2, and the outer end face of the baffle ring 6 is provided with a threaded hole for connecting the annular sealing plate 5. The outer side surface of the annular sealing plate 5 is provided with a pressing ring 3, and the threaded connecting piece 4 sequentially penetrates through the pressing ring 3 and the annular sealing plate 5 and then is connected with the baffle ring 6 or the supporting pipe body 13. The threaded connection 4 may be a screw.
The overall connection relationship of the present embodiment is: the threaded flange 1 and the baffle ring 6 are respectively connected with the pipeline 2 through threads, and the threads are sealed by thread sealant. The pressing ring 3 fixes the annular sealing plate 5 on the baffle ring 6 and the supporting pipe body 13 through the threaded connection piece 4, and the annular sealing plate 5 prevents water flow from entering the vibration isolation part inside the equipment to play a role in compartment sealing. The inner surface of the primary elastic vibration isolation piece is connected with the outer wall of the pipeline 2, and the outer surface of the primary elastic vibration isolation piece is connected with the stepped sleeve 9; the inner surface of the secondary elastic vibration isolating member 10 is in close contact with the stepped sleeve 9, and the outer surface of the secondary elastic vibration isolating member 10 is in close contact with the inner peripheral surface of the support pipe body 13. One end of the baffle ring 6 is tightly attached to the outer end face of the secondary elastic vibration isolation part 10, so that the elastic element is prevented from axially moving. The support tube 13 and the welding tube 11 are provided with flange flanges, and are connected by a screw connector 4, and the two are sealed by a sealing gasket 12. The welded pipe body 11 is welded to the bulkhead 7.
The cabin-penetrating vibration isolation device for the pipeline 2 can realize sealing protection of a compartment, and is mainly realized by an annular sealing plate 5. The clamping ring 3 is fixed on the annular sealing plate 5 between the retaining ring 6 and the supporting pipe body 13 through the threaded connection piece 4, when the annular sealing plate 5 bears the bulkhead pressure, the annular sealing plate 5 is tightly attached to the retaining ring 6, the pressure is larger, the attachment is tighter, the water flow can be effectively blocked inside the equipment, and compared with the traditional cabin penetrating piece, the safety and the reliability of the pipeline system work are improved.
The elastic cabin-crossing vibration isolation device for the pipeline has certain self-limiting and displacement compensation capabilities. Under the working condition, the pipeline 2 is allowed to have certain axial and radial displacement, and the requirement of installation and adjustment can be met. The stepped sleeve 9 plays a limiting role: when the radial displacement of the pipeline 2 is too large, the stepped sleeve 9 is contacted with the pipeline 2; when the axial displacement of the pipeline 2 is overlarge, the elastic vibration isolation element is compressed, and the stepped sleeve 9 is in contact with the baffle ring 6 to play a role in mechanical limit. The end surface of the baffle ring 6 is tightly attached to the secondary elastic vibration isolation part 10, so that the elastic vibration isolation part can be always in a working position relative to the pipeline 2, and the axial movement of the elastic vibration isolation part is prevented; meanwhile, the annular sealing plate 5 is provided with folds (namely, the folds are designed into a sawtooth rotation or corrugated structure), so that certain displacement compensation can be provided, and the annular sealing plate 5 is prevented from being excessively deformed and torn or plastically deformed when the pipeline 2 is displaced.
The pipeline elastic cabin vibration isolation device is convenient to weld and simple to disassemble and assemble. Before installation, the welding pipe body 11 is welded with the bulkhead 7, and other components except the welding pipe body 11 are assembled before the upper ship and are assembled as a whole; the support pipe body 13 is connected to the welding pipe body 11 by a flange. During disassembly, the threaded connector 4 connecting the welding pipe body 11 and the support pipe body 13 is only required to be loosened, and the welding pipe body is reinstalled after the components are replaced. The design is convenient for welding construction and disassembly and assembly, and can effectively avoid the welding heat from being transferred to the inside of the pipe body to further influence the performance of the elastic element.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the embodiments, it will be apparent to those skilled in the art that modifications can be made to the technical solutions described in the above-mentioned embodiments, or equivalent substitutions of some technical features, but any modifications, equivalents, improvements and the like within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims (7)
1. The sealed pipeline elastic cabin-crossing vibration isolation device is characterized by comprising a supporting pipe body, a vibration isolation assembly arranged in the supporting pipe body, and baffle rings and annular sealing plates which are respectively arranged on two sides of the vibration isolation assembly; the outer wall of the welding pipe body is fixedly connected with the cabin wall of the cabin; the vibration isolation assembly is coaxially sleeved on a cabin-penetrating pipeline, the outer end of the vibration isolation assembly is tightly pressed against the inner side surface of the baffle ring, and the baffle ring is connected with the pipeline; the outer side surface of the baffle ring is provided with an annular sealing plate, and the inner circumferential surface of the annular sealing plate is tightly attached to the outer wall of the pipeline; the inner edge of the annular sealing plate is fixedly connected with the retaining ring, and the outer edge of the annular sealing plate is connected with the end face of the supporting pipe body; the vibration isolation assembly comprises a primary vibration isolation group and a plurality of secondary vibration isolation groups which are symmetrically distributed on two sides of the primary vibration isolation group by taking the primary vibration isolation group as a center; the primary vibration isolation group comprises a primary elastic vibration isolation piece; the secondary vibration isolation set comprises a stepped sleeve and a plurality of secondary elastic vibration isolation parts, the end parts of the two stepped sleeves respectively arranged at two sides of the primary vibration isolation part are spliced, the middle parts of the two stepped sleeves form an annular groove, the primary elastic vibration isolation part is arranged in the annular groove, and the peripheral surface of the primary elastic vibration isolation part is tightly pressed with the annular groove; the second-stage elastic vibration isolation piece is arranged on the stepped sleeve, and the peripheral surface of the second-stage elastic vibration isolation piece is tightly attached to the inner wall surface of the supporting pipe body.
2. The sealed conduit elastic through-the-cabin vibration isolator of claim 1, wherein said annular sealing plate is of a saw-toothed or corrugated configuration as a whole.
3. The sealed conduit elastic cross-hatch vibration isolation mounting of claim 1 wherein said annular seal plate is formed of a rubber material.
4. The sealed pipeline elastic cabin-crossing vibration isolator according to claim 1, wherein the primary elastic vibration isolator and the secondary elastic vibration isolator are both elastic ring structures and are made of nitrile rubber materials.
5. The sealed pipeline elastic cabin-penetrating vibration isolation device according to claim 4, wherein the primary elastic vibration isolation member and the secondary elastic vibration isolation member are respectively provided with crossed blind holes uniformly and axially.
6. The elastic through-the-cabin vibration isolation device for the sealed pipeline as claimed in claim 1, wherein a flange A is formed on the outer surface of the welded pipeline, and a circle of threaded holes are formed in the flange A; the outer surface of the supporting pipe body is provided with a flange B corresponding to the flange A in position, a circle of unthreaded holes are formed in the flange B, and the flange A is connected with the flange B through a threaded connecting piece.
7. The sealed conduit elastic through-the-cabin vibration isolator of claim 1, wherein a threaded flange is provided on the conduit outside the annular seal plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910041120.9A CN109854818B (en) | 2019-01-16 | 2019-01-16 | A sealed pipeline elastic penetration vibration isolation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910041120.9A CN109854818B (en) | 2019-01-16 | 2019-01-16 | A sealed pipeline elastic penetration vibration isolation device |
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| Publication Number | Publication Date |
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| CN109854818A CN109854818A (en) | 2019-06-07 |
| CN109854818B true CN109854818B (en) | 2020-04-21 |
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| CN201910041120.9A Expired - Fee Related CN109854818B (en) | 2019-01-16 | 2019-01-16 | A sealed pipeline elastic penetration vibration isolation device |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111140697B (en) * | 2020-01-14 | 2020-11-06 | 武汉线谱减振科技有限责任公司 | Symmetrical double-arc elastic cabin penetrating piece and manufacturing method |
| CN111578000B (en) * | 2020-06-12 | 2024-07-26 | 武汉麦康德设备有限公司 | Marine floating raft type vibration isolation cabin connecting pipe |
| CN111577999B (en) * | 2020-06-12 | 2024-07-26 | 武汉麦康德设备有限公司 | Marine external pressure secondary vibration isolation cabin connecting pipe |
| CN114484129B (en) * | 2021-12-31 | 2022-10-21 | 江苏晨光波纹管有限公司 | Multidirectional shock attenuation compensator with floating drive ring |
| CN114636022B (en) * | 2022-05-07 | 2022-08-16 | 山西省安装集团股份有限公司 | Water supply and drainage pipeline structure for building construction |
| CN115076467A (en) * | 2022-06-01 | 2022-09-20 | 中国船舶重工集团公司第七一九研究所 | Cabin penetrating device and ship |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10350385A1 (en) * | 2003-10-28 | 2005-06-02 | Martin Reuter | Fireproof bulkhead for mounting in wall/ceiling opening, has clamping units positioned on one side of opening and tightly connected with support clamps, where clamping units tightly encompass tubes |
| CN201250957Y (en) * | 2008-09-01 | 2009-06-03 | 牟义慧 | Seal elastic compensation-type pipe wall bushing |
| DE102013014511A1 (en) * | 2013-08-22 | 2015-02-26 | Aik Flammadur Brandschutz Gmbh | Fire protection device for securing a ceiling or wall opening performing a supply line in case of fire |
| CN205101687U (en) * | 2015-09-30 | 2016-03-23 | 武汉武船机电设备有限责任公司 | Cabin pipe fitting is led to to elasticity for hydraulic pressure |
| GB201601820D0 (en) * | 2016-02-02 | 2016-03-16 | Rolls Royce Power Eng | An arrangement for adjoining a support structure to a pipe |
| US10557573B2 (en) * | 2016-11-04 | 2020-02-11 | United Technologies Corporation | Feed through seals and fittings |
| CN106439239A (en) * | 2016-12-12 | 2017-02-22 | 中国船舶重工集团公司第七〇九研究所 | Pipeline penetration structure |
| CN207261833U (en) * | 2017-09-29 | 2018-04-20 | 无锡市华东减震器有限公司 | A kind of crossing cabin pipeline structure |
| CN207935555U (en) * | 2017-11-13 | 2018-10-02 | 中国船舶重工集团公司第七一九研究所 | A kind of multichannel vibration isolation type pipe penetration piece |
| CN207848620U (en) * | 2018-01-19 | 2018-09-11 | 靖江市海鸿塑胶科技有限公司 | A kind of micropore isolated form elasticity pipe penetration piece |
| CN108709017A (en) * | 2018-06-28 | 2018-10-26 | 江苏科技大学 | A kind of pipeline crossing cabin isolation mounting |
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2019
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