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WO2009030085A1 - Dispositif de protection de filetages sur des extrémité de tube - Google Patents

Dispositif de protection de filetages sur des extrémité de tube Download PDF

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Publication number
WO2009030085A1
WO2009030085A1 PCT/CN2007/070624 CN2007070624W WO2009030085A1 WO 2009030085 A1 WO2009030085 A1 WO 2009030085A1 CN 2007070624 W CN2007070624 W CN 2007070624W WO 2009030085 A1 WO2009030085 A1 WO 2009030085A1
Authority
WO
WIPO (PCT)
Prior art keywords
injection molding
skeleton
steel pipe
thread
cylindrical rigid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2007/070624
Other languages
English (en)
Chinese (zh)
Inventor
Lianji Sun
Zhenxiang Jia
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to PCT/CN2007/070624 priority Critical patent/WO2009030085A1/fr
Publication of WO2009030085A1 publication Critical patent/WO2009030085A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • B65D59/02—Plugs
    • 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
    • B65D59/06—Caps
    • 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
    • F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
    • F16L57/005—Protection of pipes or objects of similar shape against external or internal damage or wear specially adapted for the ends of pipes

Definitions

  • the invention relates to a pipeline protection device and a preparation method thereof, in particular to a protection device for internal and external threads of an end portion of a steel pipe and a preparation method thereof.
  • the pipe is made up of a section of pipe, according to the needs of the project, such as oil pipelines, etc., because both ends of the pipe are provided with internal and external threads for interconnection, generally in transportation
  • the threads of the tube head are protected during the process.
  • the thread protectors used in the prior art for various pipe ends are mainly composed of all steel or full plastic or steel-plastic composite structures.
  • All-steel thread protector because its threaded parts are not treated with flexibility, it is easy to damage the thread at the end of the pipe when transporting or disassembling, in case of excessive external impact force; Due to the poor strength, in the case of excessive external impact force or temperature change during transportation or disassembly, it is easy to cause its own deformation, which may cause it to be removed or weakened due to its deformation. .
  • the relevant personnel developed a steel-plastic combined thread protector, which is mainly composed of a steel ring layer and a plastic layer, and is formed by a single injection molding plastic layer on the surface or inner layer of the steel ring layer.
  • the purpose of the present invention is to overcome the deficiencies in the prior art mentioned above, and to provide a steel pipe with reasonable structure, low shrinkage deformation, high and low temperature resistance, high dimensional accuracy, improved impact resistance, avoidance of falling off, and energy conservation. End thread protection.
  • a protective device for the end thread of a steel pipe comprising a cylindrical rigid skeleton provided with a flange at one end, and being fitted with the rigid skeleton and having a recessed back cover a casing, the side periphery of the casing is provided with a thread for matching the thread provided at the end of the steel pipe, characterized in that the side periphery of the cylindrical rigid frame is provided with a rib;
  • the housing is packaged using a staged injection molding process and a cylindrical rigid frame.
  • the side periphery of the rigid skeleton is an inner periphery
  • the inner side of the rigid skeleton is equidistantly provided with at least four ribs;
  • the side periphery of the rigid skeleton is an outer periphery;
  • the outer periphery of the rigid skeleton is equidistantly provided with at least four ribs;
  • the graded injection molding is at least two injection moldings.
  • the invention also provides a preparation method of the protection device for the end thread of the steel pipe, comprising the following steps:
  • the external thread protection device of the invention is prepared.
  • Another step of the preparation method of the present invention is:
  • a cylindrical rigid skeleton with one injection molding is placed twice in the mold of the injection molding machine, and the injection molding with the outer rib shell is performed to cool and discharge the mold.
  • the internal thread protection device of the invention is prepared.
  • the protection device of the invention firstly performs the first injection molding on the outer surface or the inner surface of the cylindrical rigid skeleton, and then performs the secondary molding.
  • the outer or inner injection molding shell once plays a good impact resistance. It is molded twice and the size is accurate.
  • the product is not cracked at a low temperature of 46 degrees and has a high temperature of 66 degrees. It solves the problems of shrinkage deformation, high and low temperature resistance and insufficient dimensional accuracy in the prior art.
  • the manufacturing process of the thread of the plastic outer layer of the existing petroleum steel pipe thread protector is that after the plastic outer layer is injection molded, the thread is machined on the surface of the lathe, and the process is cumbersome.
  • the invention is an injection mold equipped with a plastic outer layer with a thread. When the plastic outer layer is injection molded, the thread is injection molded, the repeatability is good, the thread size precision is high, the process is simple, and the surface smoothness of the product is good, no lathe processing The gap solves the problem of oil absorption.
  • the invention can be made into a corresponding size model.
  • the matching protector can be screwed into the end of the pipe through the thread of the plastic outer layer of the protector. It is tightly coupled to the internal threads of the pipe to ensure that the pipe threads are not damaged.
  • the invention has wide application range and is applicable to petroleum steel pipes or other pipes of various diameters. Generally, the diameter range can be set from 23 ⁇ 4 inch to 20 inches. 5.
  • the thread protection device of the invention can resist the strong impact force of different angles under special circumstances, realizes the rigidity and softness, and can closely match the external thread of the pipe wall of the pipe to be protected, so as to ensure that the pipe thread is not damaged.
  • the structure is reasonable, the manufacturing process is simple, the cost is low, the use is convenient, the impact resistance is good, and the utility model can be repeatedly used for a long time.
  • FIG. 1 is a half cross-sectional structural view of a steel pipe rib protection device of the present invention
  • FIG. 2 is a half cross-sectional structural view showing another embodiment of the steel pipe rib protection device of the present invention; wherein the 1-cylindrical rigid skeleton 2-second molding layer 3-sub-molded casing 4-thread 5-rib
  • the protection device for the end thread of the steel pipe of the present invention comprises a cylindrical rigid frame 1 provided with a flange at one end, and the rigid frame 1 can be made of metal material or engineering plastic under the condition that the rigidity is satisfied.
  • the rigid frame 1 can be made of metal material or engineering plastic under the condition that the rigidity is satisfied.
  • stainless steel, nylon, aluminum profiles, etc. this embodiment is preferably made of a stainless steel material.
  • the skeleton 1 and the casing 3 with a recessed back cover are put together, and the casing 3 can be any single type or a mixture of several types, such as polyethylene, polypropylene, polyvinyl chloride.
  • the blend of polyethylene polypropylene, etc. is preferably prepared from a polyethylene material; the side periphery of the skeleton 1 is provided with a thread 4 for matching the end thread of the steel pipe.
  • the side periphery of the skeleton 1 of the present invention refers to the inner side periphery or the outer side periphery.
  • the casing 3 is disposed outside the cylindrical rigid frame 1 (as shown in Fig. 2).
  • the casing 3 is disposed on the inner side of the cylindrical rigid frame 1 (as shown in FIG. 1), thus facilitating the end portion of the steel pipe.
  • the internal thread or the external thread is screwed to protect the end of the steel pipe; in order to make the rigid frame 1 and the casing 2 with the recessed back cover in close contact with each other to avoid deformation, the present invention overcomes the existing One injection molding shell in technology
  • the technical defect of 3 is a step of forming the shell 3 once by forming the layer 2, and ribs 5 are provided on the side periphery of the rigid frame 1, and the ribs 5 may be on the inner side or the outer side of the frame 1. At least four strips are disposed at equal distances in the periphery, and the present embodiment is provided as ten strips.
  • the first forming layer 2 can firmly bond the overmolded casing 3 and the rigid frame 1 together in a large area, and at the same time,
  • the secondary forming layer 2 can also be filled into the ribs 5, and the ribs 5 serve as a left, right, upper and lower reinforcement, positioning function, thereby effectively preventing the shell and the skeleton from falling off each other;
  • Secondary molding Layer 2 is a modified material, which can be made of any recycled plastic, which can greatly save energy, reduce cost and extend the service life of the protection device.
  • the preparation method of the invention comprises the protection device for preparing the external thread of the end portion of the steel pipe and the protection device for the internal thread of the end portion of the steel pipe.
  • the method for preparing the outer thread of the steel pipe is: firstly, the cylindrical rigid skeleton 1 is prepared; then the rib 5 is rolled around the periphery of the skeleton 1; and the cylindrical rigid skeleton 1 is placed in the mold of the injection molding machine. Injecting the first molding layer 2 into the inner side of the rigid frame 1 for cooling; and then placing the cylindrical rigid skeleton 1 with the first molding 2 into the mold of the injection molding machine, and injecting the secondary rib with the inner rib
  • the casing 3 is molded and cooled. That is, the outer rib protection device of the invention is prepared, as shown in FIG.
  • the preparation method of the internal thread protection device of the steel pipe end is: firstly, the cylindrical rigid skeleton 1 is prepared; the cylindrical rigid skeleton 1 is placed in the mold of the injection molding machine, and the first molding layer 2 is directly injected into the outer side of the rigid skeleton. Cooling; then placing the cylindrical rigid skeleton 1 with the first molding layer 2 into the mold of the injection molding machine, and injecting the overmolded housing 3 with the outer ribs for cooling; Internal rib protection, see Figure 2.
  • the rigid frame of the internal thread protection device is disposed on the inner side of the housing, so that the ribs may or may not be rolled.
  • the rigid skeleton 1 of the present invention is made of a stainless steel material
  • the rigid skeleton 1 can be prepared in two ways.
  • the first type is made by cutting, rolling, welding, stretching, and derusting the steel sheet when the material is a steel sheet.
  • the steel pipe is cut, stretched, and rusted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

La présente invention concerne un dispositif de protection des filetages sur l'extrémité de tube qui inclut un cadre rigide cylindrique (1) comportant une bride sur une extrémité ainsi qu'un boîtier assemblé sur le cadre rigide (1) et pourvu d'une couverture arrière en dent de scie ; des filetages (4) sont positionnés à la périphérique dudit boîtier, lesdits filetages (4) correspondant aux filetages de l'extrémité de tube ; des rainures (5) sont placées à la périphérie du cadre rigide cylindrique (1) ; et ledit boîtier est fixé au cadre rigide cylindrique (1) par un procédé de moulage par injection progressif. Il présente une structure rationnelle, ne peut pas facilement se contracter et se déformer, peut résister aux variations de hautes et basses températures, et possède une grande précision dimensionnelle. Il améliore les propriétés anti-impact, permet d'éviter un déchaussement, économise l'énergie et peut être intensivement prolongé et appliqué.
PCT/CN2007/070624 2007-09-05 2007-09-05 Dispositif de protection de filetages sur des extrémité de tube Ceased WO2009030085A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2007/070624 WO2009030085A1 (fr) 2007-09-05 2007-09-05 Dispositif de protection de filetages sur des extrémité de tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2007/070624 WO2009030085A1 (fr) 2007-09-05 2007-09-05 Dispositif de protection de filetages sur des extrémité de tube

Publications (1)

Publication Number Publication Date
WO2009030085A1 true WO2009030085A1 (fr) 2009-03-12

Family

ID=40428436

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2007/070624 Ceased WO2009030085A1 (fr) 2007-09-05 2007-09-05 Dispositif de protection de filetages sur des extrémité de tube

Country Status (1)

Country Link
WO (1) WO2009030085A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102633050A (zh) * 2012-04-25 2012-08-15 天津市津英达塑料制品有限责任公司 带有平顶封底的螺纹保护器
CN102642665A (zh) * 2012-04-27 2012-08-22 天津市津英达塑料制品有限责任公司 带有锥度的内螺纹保护器
CN102985746A (zh) * 2010-05-03 2013-03-20 钻科专利及科技公司 管道螺纹保护装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4157100A (en) * 1977-08-17 1979-06-05 John Turk Thread protector device
US4655256A (en) * 1985-01-14 1987-04-07 Ampco-Pittsburgh Corporation Threaded end protector and component
US4809752A (en) * 1986-05-02 1989-03-07 Wilhelm Strodter Maschinen- Und Apparatebau Thread protector for screw threads, made of a deformable material with a complementary thread
JP2000191023A (ja) * 1998-12-29 2000-07-11 Nippon Tubular Products Kk 管端部保護装置
CN2414279Y (zh) * 1999-04-23 2001-01-10 天津市津英达塑料制品有限责任公司 钢塑体螺纹保护环
CN1390694A (zh) * 2002-07-23 2003-01-15 蒯一希 带增强结构的电热熔管件的制造方法
CN101066717A (zh) * 2007-06-06 2007-11-07 杨泽景 石油钢管螺纹保护套及其制造方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4157100A (en) * 1977-08-17 1979-06-05 John Turk Thread protector device
US4655256A (en) * 1985-01-14 1987-04-07 Ampco-Pittsburgh Corporation Threaded end protector and component
US4809752A (en) * 1986-05-02 1989-03-07 Wilhelm Strodter Maschinen- Und Apparatebau Thread protector for screw threads, made of a deformable material with a complementary thread
JP2000191023A (ja) * 1998-12-29 2000-07-11 Nippon Tubular Products Kk 管端部保護装置
CN2414279Y (zh) * 1999-04-23 2001-01-10 天津市津英达塑料制品有限责任公司 钢塑体螺纹保护环
CN1390694A (zh) * 2002-07-23 2003-01-15 蒯一希 带增强结构的电热熔管件的制造方法
CN101066717A (zh) * 2007-06-06 2007-11-07 杨泽景 石油钢管螺纹保护套及其制造方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102985746A (zh) * 2010-05-03 2013-03-20 钻科专利及科技公司 管道螺纹保护装置
CN102633050A (zh) * 2012-04-25 2012-08-15 天津市津英达塑料制品有限责任公司 带有平顶封底的螺纹保护器
CN102642665A (zh) * 2012-04-27 2012-08-22 天津市津英达塑料制品有限责任公司 带有锥度的内螺纹保护器

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