WO2018223277A1 - 一种管道焊接坡口的保护装置 - Google Patents

一种管道焊接坡口的保护装置 Download PDF

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WO2018223277A1
WO2018223277A1 PCT/CN2017/087251 CN2017087251W WO2018223277A1 WO 2018223277 A1 WO2018223277 A1 WO 2018223277A1 CN 2017087251 W CN2017087251 W CN 2017087251W WO 2018223277 A1 WO2018223277 A1 WO 2018223277A1
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Prior art keywords
pipe
protection device
wall
connecting end
protective cover
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PCT/CN2017/087251
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English (en)
French (fr)
Inventor
丁佳
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乔治洛德方法研究和开发液化空气有限公司
丁佳
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Application filed by 乔治洛德方法研究和开发液化空气有限公司, 丁佳 filed Critical 乔治洛德方法研究和开发液化空气有限公司
Priority to PCT/CN2017/087251 priority Critical patent/WO2018223277A1/zh
Priority to CN201780091500.2A priority patent/CN110709334A/zh
Publication of WO2018223277A1 publication Critical patent/WO2018223277A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D59/00—Plugs, sleeves, caps, or like rigid or semi-rigid elements for protecting parts of articles or for bundling articles, e.g. protectors for screw-threads, end caps for tubes or for bundling rod-shaped articles
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G1/00—Scaffolds primarily resting on the ground
    • E04G1/28—Scaffolds primarily resting on the ground designed to provide support only at a low height
    • E04G1/30—Ladder scaffolds

Definitions

  • the invention relates to the technical field of steel pipe end welding groove and pipeline internal protection, so that the pipeline is not damaged or polluted during transportation, storage and loading and unloading.
  • each pipe is connected by welding.
  • the parts to be welded are processed into groove.
  • the steel pipe needs to be hoisted several times before it finally reaches the site welding.
  • the thickness of the slope at the end of the steel pipe is only 1.5mm, which is easily damaged by impact during transportation and lifting.
  • the pipes used in the air separation device and the hydrogen production device are not contaminated inside the pipe.
  • pipes exposed to air are prone to rust and rust, or fall into other impurities to contaminate the pipeline.
  • the existing protection measures are to directly weld the cover on the pipe groove, and then fill the inside of the pipe with nitrogen to ensure that the inside of the pipe is not polluted during transportation.
  • the cover of the pipe port is cut off from the pipe together with the groove, and the groove is re-grounded on site.
  • the solution is not only complicated, time consuming, and labor intensive, but pipes that connect other systems can cause metal chips to fall into the already cleaned system connected to the pipe during the cutting and re-grinding of the groove.
  • the Chinese utility model patent CN 200957932Y discloses a plastic steel pipe end retainer comprising a ring body formed by a cylindrical body and an outer flange of one end thereof, characterized in that the ring body is placed and placed by a plastic body as its body. Several of the bent steel sheets are composited.
  • the utility model patent can protect the pipe end groove well, but the pipe end retainer in the utility model is inserted into the pipe interior by the cylinder body, and the pipe interior is not dense. Sealed, the internal exposure to the external environment, easy to rust or other pollution, only applicable to the protection of the pipe groove that does not require the internal cleanliness of the pipeline.
  • Chinese invention patent application CN 101966889A discloses a light pipe protection cap, which can design a protective cap which closely matches the pipe according to the diameter, wall thickness and end surface slope of the protected pipe, and protects the pipe end groove and the pipe inner wall.
  • the invention is highly targeted, and the wall thickness of the pipe or the slope of the pipe end face needs to be redesigned.
  • the installation and disassembly are not convenient and fast, and there is no nitrogen protection pipe. It can be seen that there are still many improvements in the prior art.
  • the invention discloses a pipeline groove protection device, which is used for protecting the inner wall of the pipeline from being polluted during transportation, and protecting the groove from being collided during transportation.
  • a groove protection device installed on a pipeline comprising a protective cover and a quick opening connector, wherein the protective cover is sleeved around the end of the pipe and wraps the pipe port, and the protective cover is fixed to the outer wall of the pipe through the quick opening connector.
  • the protective cover includes a cover end and a connecting end on the protective cover;
  • the quick opening connecting member includes a connecting end fixed to the outer wall of the pipe, a gasket and a sealing member.
  • the connecting end on the protective cover comprises an upper chuck
  • the connecting end fixed on the outer wall of the pipe comprises a lower chuck
  • the sealing component comprises a clamp
  • the protective cover is formed by welding the upper chuck and the cover plate, and the lower chuck is welded to the outer wall of the pipe.
  • the welding method can be fillet welding, inserting the gasket between the upper chuck and the lower chuck, the upper chuck and the lower card The disc is sealed by a clamp.
  • the connecting end of the protective cover can also adopt an upper flange.
  • the connecting end of the outer wall of the pipe adopts a lower flange, and the sealing member is made of a bolt and a nut.
  • the internal sealing degree of the pipeline only needs to ensure that the internal surface pressure of the pipeline reaches 0.02Mpa-0.03Mpa after being filled with nitrogen.
  • the connecting end fixed to the outer wall of the pipe is welded to the outer wall of the pipe near the pipe port.
  • the distance between the adjacent two welds cannot be too close, that is, the upper surface of the connecting end of the outer wall of the pipe and the outer wall of the pipe.
  • the weld is welded to the end of the pipe and the weld to be welded. Therefore, the connection end fixed to the outer wall of the pipe is welded to the upper surface of the outer wall of the pipe at a distance from the end of the pipe. 50mm or more.
  • the groove refers to a groove in which the pipe to be welded is processed and assembled into a certain geometric shape, and the groove is located at the end of the pipe.
  • the invention is applicable to pipes with a nominal diameter between DN15 and DN500, and a corresponding size protection device can be designed according to the pipe size.
  • the pipelines of carbon steel, aluminum and the like which are used for the hydrogen production device and the air separation device are prevented from being rusted or otherwise contaminated.
  • the specific operation is as follows: seal the groove protection device at one end of the fixed pipe, open the other end groove protection device, fill the pipe with nitrogen from the valve on the pressure gauge at one end of the seal, and keep the pressure gauge on the pressure gauge. The reading is 0.02MPa-0.03MPa. After the air inside the pipeline is emptied, the other end groove protection device is sealed and fixed to ensure the internal surface pressure of the pipeline is 0.02MPa-0.03Mpa.
  • a joint is welded on the protective cover of the groove protection device, and the pressure gauge is connected to the inside of the pipe through the joint through the pressure pipe.
  • the invention surrounds the pipe groove, avoids the groove being exposed in the external environment, making it difficult to rust or other pollution, and also avoiding the damage of the groove caused by the collision during transportation.
  • the invention seals the pipeline port to avoid entry of external impurities, and is filled with nitrogen inside, removes air, keeps dry, and prevents rust or other pollution inside the metal pipe suitable for equipment such as air separation device and hydrogen production device.
  • the method for protecting the slope of the pipe to be welded in the traditional air separation system is to weld the cover plate on the groove of the pipe, and the inside of the pipe is filled with nitrogen to protect the inside of the pipe from pollution.
  • the protective cover is sealed and fixed at the pipe port by using a quick-opening connecting member, and the connecting member can be opened at the site, and the protective cover can be removed to perform welding. Since the original groove is not used in the invention, and the groove is protected from being damaged during transportation, it is not necessary to re-process the groove and directly weld on the original groove.
  • the traditional groove protection method requires cutting the pipe on site and re-processing the groove. During the process of cutting and polishing the groove, the metal chips may fall to the inner wall of the pipe, if the pipe and other Device connections, such as pressure devices, may also fall into the device, causing contamination and increasing the cost of re-cleaning.
  • the groove protection device disclosed by the invention adopts a quick opening connection member, and the installation and disassembly are convenient and quick. After the pipeline to be welded is transported to the site, the protection device can be directly removed after the protection device is quickly removed, thereby saving a lot of work.
  • the groove protection device of the present invention can be repeatedly disassembled, and the pipe to be welded of the same outer diameter can be repeatedly used.
  • Figure 1 is a schematic cross-sectional view of the present invention
  • Figure 2 is a plan view of the present invention
  • Figure 3 is a schematic view of the installation position of the pressure gauge.
  • the invention is mainly applied to the protection of the end of the pipe during transportation, especially for the inner wall of the pipe, such as the air separation device and the pipe in the hydrogen production device.
  • This type of device has high requirements on pipes, and the inside of the pipes cannot be rusted or otherwise contaminated.
  • the pipes for transporting gas and liquid need to be connected to each other or to the corresponding equipment, and are generally connected by welding.
  • the portion to be welded needs to be processed into a groove, as shown by 7 in FIG.
  • the top of the groove is thin. If it is not protected, it is easily damaged during transportation and affects the quality of welding.
  • the invention provides a groove protection device installed on a pipeline, comprising a protective cover and a quick opening connector, wherein the protective cover is sleeved around the end of the pipe end and wraps the pipe port, and the protective cover is fixed by the quick opening connector On the outer wall of the pipe.
  • the protective cover includes a cover plate 1 and a connecting end on the protective cover;
  • the quick opening connecting member includes a connecting end fixed to the outer wall of the pipe, the gasket 4 and a sealing member.
  • the connecting end on the protective cover comprises an upper chuck 2
  • the connecting end fixed to the outer wall of the pipe comprises a lower chuck 5
  • the sealing member comprises a clamp 3.
  • the protective cover is welded by the cover plate 1 and the upper chuck 2, and the lower chuck 5 is welded to the outer wall of the pipe 6, and the welding method can be sealed fillet welding, and the upper chuck 2 and the lower chuck 5 are inserted.
  • Gasket 4 The upper chuck 2 and the lower chuck 5 are sealedly connected by a clamp 3.
  • the connecting end on the protective cover can also adopt an upper flange.
  • the connecting end fixed to the outer wall of the pipe adopts a lower flange, and the sealing member adopts a bolt and a nut.
  • Embodiment 2 is a plan view of Embodiment 1, in which the cover plate 1, the clip 3, the clamp bolt 31, and the clamp nut 32 are visible.
  • the lower chuck 5 is welded to the upper surface of the outer wall of the duct 6 at a distance of 50 mm or more from the groove 7.
  • the distance between two adjacent welds should not be too short, that is, the weld between the upper surface of the outer wall of the pipe and the outer wall of the pipe.
  • the distance between the end of the pipe and the weld to be welded to the part to be welded must not be too short. If the spacing of the welds is too small, the strength of the previous welds will be affected during welding.
  • the nominal diameter of the protected pipe 6 ranges approximately from DN 15 to DN 500, and a correspondingly sized protective device can be designed according to the size of the required protective pipe.
  • an appropriate amount of nitrogen gas may be charged inside the pipe.
  • the specific operation is as follows: seal the groove protection device at one end of the fixed pipe, open the other end groove protection device, fill the inside of the pipe with nitrogen from the valve on the pressure gauge at one end of the seal, and keep the reading on the pressure gauge as 0.02MPa-0.03MPa. After the air inside the pipeline is emptied, the other end groove protection device is sealed and fixed to ensure that the internal surface pressure of the pipeline is 0.02 MPa-0.03 MPa.
  • a joint is provided on the protective cover of the groove protection device, and the pressure gauge 8 passes through the joint through the pressure guiding tube 9. Internal connection of the pipe.
  • the quick-opening connector in the present invention refers to a connector that can be quickly installed and disassembled, such as a chuck, a clamp and a gasket, a flange, a bolt and a nut, and the quick-opening connector is not only easy to disassemble and install, but also Can be reused.
  • the invention is applicable not only to the case where the pipe groove needs to be protected, but also to the case where the inside of the pipe is required to be sealed and not contaminated by impurities.
  • the invention is also not limited to the protection of the groove and the inner wall of the pipeline during transportation, and is also applicable when placed for a long time.
  • the quick-opening connector is not limited to the chuck and the clamp mentioned in the present invention, and the flange structure belongs to the present invention.
  • the technical solutions under the idea belong to the protection scope of the present invention. It should be noted that for this technology It will be apparent to those skilled in the art that ⁇ RTIgt; ⁇ / RTI> ⁇ RTIgt; ⁇ / RTI> ⁇ RTIgt; ⁇ / RTI> ⁇ RTIgt;

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Abstract

一种对在管道运输、储存及装卸过程中的管道坡口进行保护的保护装置，包括保护罩和快开连接件，所述保护罩将所需保护管道的端部坡口包围，且通过快开连接件与管道密封连接。所述保护罩包括盖板（1）和保护罩上的连接端，所述快开连接件包括固定在管道外壁的连接端、垫片（4）和密封部件。保护罩上的连接端包括上卡盘（2），固定在管道外壁的连接端包括下卡盘（5），密封部件包括卡箍（3）。将管道充入氮气可保持内部干燥，并通过连接管道内部的压力表调节充氮压力。该装置保护待焊管道的坡口在运输、储存及装卸过程中不受碰撞和磨损，也避免了杂质进入管道内部污染管道；方便拆卸，减少了安装工作量；可重复拆卸，针对同一管径的管道可以反复利用，节省材料。

Description

一种管道焊接坡口的保护装置 技术领域
本发明涉及钢管端面焊接坡口和管道内部保护的技术领域，使得管道在运输、存储及装卸过程中不受破损和污染。
背景技术
在气体、液体的管道运输工程中，各根管道是通过焊接连接的，为保证焊接件之间形成全部焊透的焊缝，待焊部位都要加工成坡口。钢管在最终达到工地焊接前，需要经过多次起吊运转。钢管端部坡口的坡顶厚度只有1.5mm，很容易在运输，起吊的过程中，受撞击而缺损。另外，应用于空分装置和制氢装置的管道，管道内部还不能受到污染。但是，在长途运输过程中，暴露于空气的管道很容易受潮生锈，或者落入其他杂质污染管道。为了防止在运输途中管道内部受到污染，防止坡口缺损，在钢管被加工出来后，就要在管道端口装上保护装置。
现有的保护措施为直接在管道坡口上焊接盖板，再将管道内部充入氮气，从而保证管道内部在运输过程中不受污染。当管道运输到焊接目的地时，再将管道端口的盖板连同坡口一起从管道上切割下来，重新在现场打磨坡口。该方案操作起来不仅复杂、耗时、费力，而且，连接其他系统的管道在切割和重新打磨坡口的过程中，可能导致金属屑掉入与管道连接的已经清洗干净的系统。
在现有技术中，有很多涉及对坡口保护的装置，但是多为圈体结构，即仅针对坡口进行保护，没有覆盖管道端面，无法保护管道内壁。中国实用新型专利CN 200957932Y公开了一种塑钢结构管端护圈，包括一个由筒体和其一端的外翻边所构成的圈体，其特征在于圈体由作为其本体的塑料体与置于其中的若干块折弯钢片复合而成。该实用新型专利可以良好的保护管端坡口，但是，该实用新型中的管端护圈由筒体插入管道内部，管道内部没有密 封，内部暴露于外界环境中，容易生锈或受到其他污染，只适用于对管道内部洁净程度没有要求的管道坡口进行保护。
中国发明专利申请CN 101966889A公开了一种光管保护帽，该发明可根据所保护管道的直径，壁厚和端面坡度设计与管道紧密配合的保护帽，起到对管端坡口和管内壁保护的作用。但是，该发明的针对性强，管道壁厚或管道端面坡度的改变就需要重新设计保护帽，另外，安装和拆卸不够方便快捷，没有氮气保护管路。可见，现有技术还有很多可改进之处。
发明的公开
本发明公开了一种管道坡口保护装置，用于保护管道内壁在运输途中不受污染，保护坡口在运输途中不被碰撞。
本发明解决上述技术问题所采用的技术方案为：
一种安装于管道上的坡口保护装置，包括保护罩和快开连接件，其中保护罩套在管道端部外围，并将管道端口包裹住，保护罩通过快开连接件固定于管道外壁。
本发明中，保护罩包括盖板和保护罩上的连接端；快开连接件包括固定在管道外壁的连接端、垫片和密封部件。
优选的，保护罩上的连接端包括上卡盘，固定在管道外壁的连接端包括下卡盘，密封部件包括卡箍。
优选的，保护罩由上卡盘与盖板焊接形成，下卡盘焊接于管道外壁，其焊接方式可为角焊，上卡盘与下卡盘之间插入垫片，上卡盘和下卡盘通过卡箍密封连接。
本发明中，保护罩的连接端还可以采用上法兰盘，相应的，管道外壁的连接端采用下法兰盘，密封部件采用螺栓和螺母。
本发明中所述管道内部密封程度只需保证充入氮气后使管道内部表面压力达到0.02Mpa-0.03Mpa即可。
本发明中，固定在管道外壁的连接端焊接于管道端口附近的管道外壁，为保证焊接质量，相邻两条焊缝之间的距离不能太近，即管道外壁的连接端上表面与管道外壁的焊缝与管道端部坡口与待焊部件焊接的焊缝，所以，固定在管道外壁的连接端焊接于管道外壁的上表面距离管道端部坡口的距离在 50mm以上。
本发明中，坡口是指管道待焊部位加工并装配成一定的几何形状的沟槽，坡口位于管道端部。
本发明适用于公称直径在DN15到DN500之间的管道，可根据管道尺寸设计相应尺寸的保护装置。
本发明中，为了保证管道在运输过程中和长期储存的过程中保持干燥，防止用于制氢装置和空分装置等设备的碳钢、铝等金属材质的管道生锈或受到其他污染，可在管道内部充入氮气，具体操作为：密封固定管道一端的坡口保护装置，打开另一端坡口保护装置，从密封一端的压力表上的阀门向管道内部充入氮气，保持压力表上的读数为0.02MPa-0.03MPa，待管道内部空气排空后，将另一端坡口保护装置密封固定，保证管道内部表面压力为0.02MPa-0.03Mpa。
本发明中，为了便于对管道内部充入氮气的压力控制，在坡口保护装置的保护罩上焊设有一个接头，压力表通过引压管穿过接头与管道内部连接。
本发明的技术方案产生的积极效果如下：
1)保护坡口不受损害。为了保证焊接质量，坡口在运输过程中必须保持完整，不受碰撞。本发明将管道坡口包围，避免了坡口裸露在外界环境中，使其不易生锈或受到其他污染，也避免了在运输途中因碰撞导致坡口的破损。
2)保护待焊管道的内部不受污染。本发明将管道端口密封包围，避免外界杂质进入，且内部充入氮气，排除空气，保持干燥，防止适用于空分装置和制氢装置等设备的金属管道内部生锈或受到其他污染。
3)避免现场切割和加工坡口。传统空分系统中的待焊管道坡口保护方法是在管道加工好的坡口上焊接盖板，管道内部充入氮气来保护管道内部不受污染。到现场需要把管道端部切割开来，将盖板和原来的坡口都切割下来，重新在现场打磨坡口。而本发明采用快开连接件将保护罩密封固定在管道端口，在现场只需打开连接件，将保护罩取下，即可进行焊接。因为本发明未使用原有坡口，而且还保护坡口在运输途中不受破损，所以无需再次加工坡口，直接在原有坡口上进行焊接即可。
4)避免二次污染。传统的坡口保护方法需要现场切割管道，再次加工坡口，在切割和打磨坡口的过程中金属屑可能掉落至管道内壁，若管道与其他 装置连接，如压力装置等，金属屑还有可能落入该装置内，造成污染，增加再次清洗的成本。
5)减少现场工作量。本发明公开的坡口保护装置，采用快开连接件，安装和拆卸都方便快捷，待焊管道运输到现场后，快速取下保护装置后可直接进行焊接，节约了大量的工作。
6)循环利用，节省材料。本发明中的坡口保护装置，可反复拆卸，针对同一外径的待焊管道可以重复使用。
附图的简要说明
图1是本发明的剖面结构示意图；
图2是本发明的俯视图；
图3是压力表的安装位置示意图。
实现本发明的最佳方式
下面结合附图对本发明的具体实施方式作进一步的说明。
本发明主要应用于在运输途中对管道端部坡口的保护，尤其针对管道内壁也需要保护的情形，如空分装置和制氢装置中的管道。该类装置对管道的要求较高，管道内部不能生锈或受到其他污染。运输气、液的管道需要彼此连接或者与相应设备连接，一般通过焊接方式连接，为了保证焊接质量，需要将待焊部位加工为坡口，如图1中7所示。坡口顶部较薄，若不加以保护，在运输途中容易受损，影响焊接质量。
本发明提供一种安装于管道上的坡口保护装置，包括保护罩和快开连接件，其中，保护罩套在管道端部外围，并将管道端口包裹住，保护罩通过快开连接件固定于管道外壁。
保护罩包括盖板1和保护罩上的连接端；快开连接件包括固定在管道外壁的连接端、垫片4和密封部件。
如图1所示，优选的，保护罩上的连接端包括上卡盘2，固定在管道外壁的连接端包括下卡盘5，密封部件包括卡箍3。
优选的，保护罩由盖板1和上卡盘2焊接而成，下卡盘5焊接在管道6的外壁，其焊接方式可为密封角焊，上卡盘2与下卡盘5之间插入垫片4， 上卡盘2和下卡盘5通过卡箍3密封连接。
本发明中，保护罩上的连接端还可以采用上法兰盘，相应的，固定在管道外壁的连接端采用下法兰盘，密封部件采用螺栓和螺母。
图2为实施例1的俯视图，图中可视盖板1、卡箍3、卡箍螺栓31和卡箍螺母32。
在实施例1中，下卡盘5焊接于管道6外壁的上表面距离坡口7的距离在50mm以上。为了保证焊接质量，远离焊缝的热影响区，且预留足够的焊接操作空间，相邻两条焊缝之间的距离不能太短，即管道外壁的连接端上表面与管道外壁的焊缝与管道端部坡口与待焊部件焊接的焊缝之间的距离不能太短。如果焊缝的间距过小，焊接时会影响以前焊缝的强度。
在实施例1中，所保护的管道6的公称直径范围大致在DN15到DN500之间，可根据所需保护管道的尺寸设计相应尺寸的保护装置。
在实施例1中，为了保证管道在运输过程中保持干燥，防止钢管生锈与其他污染，可在管道内部充入适量氮气。具体操作为：密封固定管道一端的坡口保护装置，打开另一端坡口保护装置，从密封一端的压力表上的阀门向管道内部充入氮气，保持压力表上的读数为0.02MPa-0.03MPa，待管道内部空气排空后，将另一端坡口保护装置密封固定，保证管道内部表面压力为0.02MPa-0.03Mpa。
如图3所示，在实施例1中，为了便于对管道内部充入氮气的压力控制，在坡口保护装置的保护罩上设有一个接头，压力表8通过引压管9穿过接头与管道内部连接。
本发明中的快开连接件是指可快速安装和拆卸的连接件，如卡盘、卡箍和垫片，法兰、螺栓和螺母等结构，这些快开连接件不仅拆卸和安装简捷，而且可以重复使用。
本发明不仅适用于对管道坡口需要保护的情形，也适用于对管道内部要求密封，不受杂质污染的情形。本发明也不局限于在运输途中对管道坡口及内壁的保护，长期放置的时候同样适用。
以上仅是本发明的优选实施方式，本发明的保护范围并不仅局限于实施例，例如快开连接件不限于本发明中所提到的卡盘和卡箍，法兰结构，凡属于本发明思路下的技术方案均属于本发明的保护范围。应当指出，对于本技 术领域的普通技术人员来说，在不脱离本实发明原理前提下的若干改进和变换，应视为本发明的保护范围。

Claims (10)

  1. 一种安装于管道端部的坡口保护装置，包括保护罩和快开连接件，其特征在于，所述保护罩套在管道端部外围，并将管道端口包裹住，保护罩通过快开连接件固定于管道外壁。
  2. 根据权利要求1所述的坡口保护装置，其特征在于，所述保护罩包括盖板(1)和保护罩上的连接端；所述快开连接件包括固定在管道外壁的连接端、垫片和密封部件。
  3. 根据权利要求2所述的坡口保护装置，其特征在于，所述保护罩上的连接端包括上卡盘(2)，所述固定在管道外壁的连接端包括下卡盘(5)，所述密封部件包括卡箍(3)。
  4. 根据权利要求2所述的坡口保护装置，其特征在于，所述保护罩上的连接端包括上法兰盘，所述管道外壁的连接端包括下法兰盘，所述密封部件包括螺栓和螺母。
  5. 根据权利要求3所述的坡口保护装置，其特征在于，保护罩由盖板(1)和上卡盘(2)焊接而成，下卡盘(5)密封角焊于管道(6)外壁，上卡盘(2)与下卡盘(5)之间插入垫片，上卡盘(2)和下卡盘(5)通过卡箍(3)密封连接。
  6. 根据权利要求2所述的坡口保护装置，其特征在于，固定在管道外壁的连接端焊接于管道外壁的上表面距离管道端部坡口(7)的距离在50mm以上。
  7. 根据权利要求1所述的坡口保护装置，其特征在于，所述坡口保护装置适用管道(6)的公称直径在DN15到DN500之间。
  8. 根据权利要求1所述的坡口保护装置，其特征在于，在保护罩上焊有一个接头，压力表(8)通过引压管(9)穿过所述接头与管道内部连接。
  9. 根据权利要求1所述的坡口保护装置，其特征在于，在管道运输过程中和管道长期放置的时候，在管道内部充入氮气。
  10. 根据权利要求9所述的坡口保护装置，其特征在于，充入氮气后保持管道内部的相对压力为0.02MPa到0.03MPa。
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