CN111300735A - Integrated sealing preparation method for steel skeleton polyethylene plastic composite pipe fitting - Google Patents
Integrated sealing preparation method for steel skeleton polyethylene plastic composite pipe fitting Download PDFInfo
- Publication number
- CN111300735A CN111300735A CN201911256477.5A CN201911256477A CN111300735A CN 111300735 A CN111300735 A CN 111300735A CN 201911256477 A CN201911256477 A CN 201911256477A CN 111300735 A CN111300735 A CN 111300735A
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- CN
- China
- Prior art keywords
- pipe fitting
- composite pipe
- steel skeleton
- polyethylene plastic
- forming module
- 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.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14065—Positioning or centering articles in the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/2602—Mould construction elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14065—Positioning or centering articles in the mould
- B29C2045/14122—Positioning or centering articles in the mould using fixed mould wall projections for centering the insert
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
- B29L2023/22—Tubes or pipes, i.e. rigid
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention relates to a method for preparing an integrated seal of a steel skeleton polyethylene plastic composite pipe fitting. The method mainly solves the problems of multiple production procedures and low working efficiency of the pipe fitting produced by the existing method. The method is characterized in that: the method comprises the following steps: 1) the end opening of the module monomer inner cavity of the composite pipe fitting forming module forms a cone-shaped sealing mould inner cavity; the inner cavity of the conical sealing mould is provided with a trapezoidal positioning boss arranged along the circumference; 2) the pipe fitting steel skeleton is circumferentially provided with a plurality of punched holes; 3) the pipe fitting steel skeleton is arranged in the composite pipe fitting forming module and is positioned through the plastic positioning nail and the trapezoidal positioning boss; 4) and carrying out injection molding after the die is closed. The integrated sealing preparation method of the steel skeleton polyethylene plastic composite pipe fitting can reduce the production process of the composite pipe fitting, reduce abrasion and improve the production efficiency.
Description
Technical Field
The invention relates to the technical field of pipeline transportation, in particular to a method for preparing an integrated seal of a steel skeleton polyethylene plastic composite pipe fitting.
Background
The steel skeleton plastic composite pipe product is formed by using a high-quality thin steel plate, punching uniformly, welding a winding drum as a reinforcing skeleton and performing injection molding. When the pipe fitting is produced, the reinforced framework (the elbow, the tee joint and the like) is preheated in an oven, then the reinforced framework is placed in a mold cavity, the shape given by the mold cavity is obtained after injection, pressure maintaining, cooling and solidification, and then the mold is opened to obtain a molded product.
The pipe fitting product is positioned in the cavity through the steel positioning nail on the reinforcing framework in the injection molding process, so that the framework is prevented from deviating and is subjected to injection molding. The existing product mainly has the following problems:
firstly, the die cavity is severely worn. In the production process, the inner cavity of the pipe fitting mold is directly contacted with the reinforced framework steel nail, and in the framework placing and injection pressure maintaining processes, the framework steel nail and the cavity are subjected to friction and extrusion, so that the inner surface of the cavity is scratched and dented to a certain degree; due to the abrasion of the cavity, the cavity needs to be repaired regularly, the size of the reinforced framework steel nail is changed along with the abrasion of the cavity, and unstable factors are brought to quality control.
Secondly, the pipe fitting product has poor appearance, and the steel nails on the outer surface are exposed. The pipe fitting product has poor appearance wrinkles due to the damage of the inner surface of the cavity; the reinforcing framework adopts metal steel nails for positioning, the steel nails are in contact with the cavity, the steel nails are distributed on the outer surface of the product after molding, the steel nails are used for a long time or overhead in a coastal region under a damp alkali environment, and the steel nails positioned on the outer surface can be corroded to further influence the use stability of the product.
And thirdly, carrying out an end taper sealing procedure after the pipe fitting product is formed. The pipe fitting product adopts electric smelting sleeve hot melt to connect when connecting or being connected with compound pipe, and the compound pipe product tip of pipe industry company all adopts the toper to seal, and in order to connect the cooperation needs, the pipe fitting product need be moulded plastics at the tip after the shaping and seals the process.
Disclosure of Invention
The invention provides a method for preparing an integrated seal of a steel skeleton polyethylene plastic composite pipe, aiming at overcoming the problems in the background art. The integrated sealing preparation method of the steel skeleton polyethylene plastic composite pipe fitting can reduce the production process of the composite pipe fitting, reduce abrasion and improve the production efficiency.
The invention can solve the problems by the following technical scheme: a method for preparing an integrated seal of a steel skeleton polyethylene plastic composite pipe fitting comprises the following steps:
1) the end opening of the module monomer inner cavity of the composite pipe fitting forming module forms a cone-shaped sealing mould inner cavity; the inner cavity of the conical sealing mould is provided with a trapezoidal positioning boss arranged along the circumference;
2) the pipe fitting steel skeleton is circumferentially provided with a plurality of punched holes;
3) the pipe fitting steel skeleton is arranged in the composite pipe fitting forming module and is positioned through the plastic positioning nail and the trapezoidal positioning boss;
4) performing injection molding after the die is closed; after the final composite pipe fitting product is subjected to injection molding, the outer diameter of the port part is increased compared with other parts, a structure of an end part taper joint can be formed, the end part taper joint can be directly connected with an electric melting pipe fitting, and a sealing process is not needed.
The forming modules of the composite pipe fitting in the step 1 are V-shaped, tee-joint-shaped, reducing tee-joint-shaped and reducing straight-through; the V-shaped composite pipe fitting forming module (1) comprises a 45-degree elbow, a 90-degree elbow and a 22.5-degree elbow.
Step 3, the plastic positioning nail is T-shaped, the small end part of the plastic positioning nail can be inserted into the punch hole, and the large end of the plastic positioning nail is contacted with the inner wall of the die cavity; meanwhile, the trapezoidal positioning boss is abutted against the outer body of the pipe fitting steel skeleton.
And 3, the distance from the plastic positioning nail to the outer end of the pipe fitting steel skeleton is equal to the distance from the trapezoidal positioning boss to the outer end of the pipe fitting steel skeleton.
The invention relates to a preparation method of an integrated seal of a steel skeleton polyethylene plastic composite pipe, which improves the original positioning principle and mode, wherein a positioning steel nail on a reinforcing skeleton is changed into a mould positioning module with a trapezoidal positioning boss structure, and a certain number of positioning modules are arranged at two ends of a mould, so that the reinforcing skeleton does not shift axially or radially in the injection molding pressure maintaining process after being placed in a mould cavity, and the positioning effect is realized; the size and the injection molding quantity of the mold cavity are adjusted, so that after the pipe fitting product is subjected to one-time injection molding, the end part is provided with a taper-mouth type seal, and the secondary taper-mouth type seal injection molding is not needed; the steel positioning nail welded on the outer surface of the steel skeleton is eliminated, the punching hole with a specific size is added, and the plastic positioning nail is arranged to further position the composite pipe fitting forming module.
Compared with the background technology, the invention has the following beneficial effects: the integrated sealing preparation method of the steel skeleton polyethylene plastic composite pipe fitting reduces the production process of the composite pipe fitting, ensures that the end part of the pipe fitting directly has the taper-mouth type sealing after injection molding, cancels the injection molding process of secondary taper-mouth sealing, improves the production efficiency, reduces the rejection rate in the process of product sequence-transferring production, solves the problem that steel nails on the outer surface of the pipe fitting product are exposed, improves the product stability, and enlarges the application field of the product.
Description of the drawings:
FIG. 1 is a schematic view of a mold forming module for a composite pipe of the present invention;
FIG. 2 is a schematic view of the steel skeleton mounting structure of the pipe fitting of the present invention;
FIG. 3 is a schematic view of a steel skeleton composite pipe of the present invention;
FIG. 4 is a schematic view of the plastic locating pin of the present invention;
FIG. 5 is a schematic drawing of a steel plate punching hole of the steel skeleton of the pipe fitting of the present invention.
In the figure: 1. the composite pipe fitting forming method comprises the following steps of (1) forming a composite pipe fitting module, 2) punching, 3) positioning a trapezoidal boss, 4) positioning a plastic nail, 5) sealing an inner cavity of a die in a taper-mouth shape, 6) connecting a taper-mouth at the end part, 7) forming a pipe fitting steel skeleton, and 8 forming the composite pipe fitting.
The specific implementation mode is as follows:
the invention will be further described with reference to the following drawings and specific embodiments:
example 1
A method for preparing an integrated seal of a steel skeleton polyethylene plastic composite pipe fitting is shown in figures 1, 2, 3 and 5 and comprises the following steps:
1) the port of the inner cavity of the module monomer of the composite pipe fitting forming module 1 with the V-shaped 45-degree elbow forms an inner cavity 5 of a cone-shaped sealing die; the inner cavity 5 of the conical sealing mould is provided with a trapezoidal positioning boss 3 which is arranged along the circumference;
2) the pipe fitting steel skeleton 7 is provided with a plurality of punched holes 2 along the circumference;
3) the pipe fitting steel skeleton 7 is arranged in the composite pipe fitting forming module 1, and the pipe fitting steel skeleton 7 is positioned through the plastic positioning nail 4 and the trapezoidal positioning boss 3; as shown in fig. 4, the plastic positioning nail 4 is T-shaped, the small end of the plastic positioning nail can be inserted into the punched hole 2 of the pipe fitting steel skeleton 7, and the large end of the plastic positioning nail is contacted with the inner wall of the composite pipe fitting forming module; meanwhile, the trapezoidal positioning boss 3 is abutted against the outer body of the pipe steel framework 7; the distance between the plastic positioning nail 4 and the outer end of the pipe steel framework 7 is equal to the distance between the trapezoidal positioning boss 3 and the outer end of the pipe steel framework 7, so that the pipe steel framework can be positioned more stably;
4) performing injection molding after the die is closed; after the final composite pipe fitting 8 product is subjected to injection molding, the outer diameter of the port part is increased compared with other parts, a structure of the end part taper joint 6 can be formed, the end part taper joint can be directly connected with an electric melting pipe fitting, and the sealing process is not needed.
The invention relates to a preparation method of an integrated seal of a steel skeleton polyethylene plastic composite pipe, which improves the original positioning principle and mode, wherein a positioning steel nail on a reinforcing skeleton is changed into a mould positioning module with a trapezoidal positioning boss structure, and a certain number of positioning modules are arranged at two ends of a mould, so that the reinforcing skeleton does not shift axially or radially in the injection molding pressure maintaining process after being placed in a mould cavity, and the positioning effect is realized; the size and the injection molding quantity of the mold cavity are adjusted, so that after the pipe fitting product is subjected to one-time injection molding, the end part has a tapered opening type sealing shape, and secondary tapered sealing injection molding is not needed; and further positioning the composite pipe fitting forming module by installing the plastic positioning nail.
Claims (5)
1. A method for preparing an integrated seal of a steel skeleton polyethylene plastic composite pipe fitting is characterized by comprising the following steps: the method comprises the following steps:
1) the end opening of the module monomer inner cavity of the composite pipe fitting forming module (1) forms a cone-shaped sealing mould inner cavity (5); the inner cavity (5) of the conical sealing mould is provided with a trapezoidal positioning boss (3) which is arranged along the circumference;
2) the pipe fitting steel skeleton (7) is provided with a plurality of punched holes (2) along the circumference;
3) the pipe fitting steel skeleton (7) is arranged in the composite pipe fitting forming module (1), and the pipe fitting steel skeleton (7) is positioned through the plastic positioning nails (4) and the trapezoidal positioning bosses (3);
4) performing injection molding after the die is closed; after the final composite pipe fitting (8) product is subjected to injection molding, the outer diameter of the port part is increased compared with other parts, a structure of an end part taper joint (6) can be formed, the end part taper joint can be directly connected with an electric melting pipe fitting, and a sealing process is not needed.
2. The method for preparing the integrated seal of the steel skeleton polyethylene plastic composite pipe fitting according to claim 1, is characterized in that: the composite pipe fitting forming module (1) in the step 1 is a V-shaped, tee joint, reducing tee joint or reducing straight-through joint.
3. The method for preparing the integrated seal of the steel skeleton polyethylene plastic composite pipe fitting as claimed in claim 2, wherein the method comprises the following steps: the V-shaped composite pipe fitting forming module (1) comprises a 45-degree elbow, a 90-degree elbow and a 22.5-degree elbow.
4. The method for preparing the integrated seal of the steel skeleton polyethylene plastic composite pipe fitting according to claim 1, is characterized in that: step 3, the plastic positioning nail (4) is T-shaped, the small end part of the plastic positioning nail can be inserted into the punched hole (2), and the large end of the plastic positioning nail is contacted with the inner wall of the composite pipe fitting forming module; meanwhile, the trapezoidal positioning boss (3) is abutted against the outer body of the pipe fitting steel framework (7).
5. The method for preparing the integrated seal of the steel skeleton polyethylene plastic composite pipe fitting according to claim 1, is characterized in that: and 3, the distance from the plastic positioning nail (4) to the outer end of the pipe fitting steel skeleton (7) is equal to the distance from the trapezoidal positioning boss (3) to the outer end of the pipe fitting steel skeleton (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911256477.5A CN111300735A (en) | 2019-12-10 | 2019-12-10 | Integrated sealing preparation method for steel skeleton polyethylene plastic composite pipe fitting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911256477.5A CN111300735A (en) | 2019-12-10 | 2019-12-10 | Integrated sealing preparation method for steel skeleton polyethylene plastic composite pipe fitting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111300735A true CN111300735A (en) | 2020-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911256477.5A Pending CN111300735A (en) | 2019-12-10 | 2019-12-10 | Integrated sealing preparation method for steel skeleton polyethylene plastic composite pipe fitting |
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| Country | Link |
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| CN (1) | CN111300735A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112238567A (en) * | 2020-09-27 | 2021-01-19 | 安源管道实业股份有限公司 | Steel-plastic composite pipe framework positioning device and method without secondary processing |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001277305A (en) * | 2000-03-31 | 2001-10-09 | Piolax Inc | Producing method for resin hose fitted with connector |
| CN2672410Y (en) * | 2004-01-18 | 2005-01-19 | 大庆油田长垣管业有限公司 | Steel skeleton reinforced plastic composite pipe of plastic positioning nail |
| CN201325135Y (en) * | 2009-04-22 | 2009-10-14 | 华创天元实业发展有限责任公司 | Framework positioning device with framework plastic composite pipe part |
| CN204164569U (en) * | 2014-10-25 | 2015-02-18 | 安源管道实业有限公司 | A kind of composite steel-plastic pipe fitting not needing secondary sealing |
| CN204164568U (en) * | 2014-10-25 | 2015-02-18 | 安源管道实业有限公司 | A kind of composite steel-plastic pipe fitting realizing self-fluxing nature sealing |
| CN204471732U (en) * | 2015-01-18 | 2015-07-15 | 福建省海耀工程管道制造有限责任公司 | A kind of mould of steel skeleton plastic clad pipe part |
| CN208730177U (en) * | 2018-08-06 | 2019-04-12 | 中国石油天然气集团有限公司 | A kind of steel frame polyethylene compound pipe electric melting sleeve framework positioning device |
-
2019
- 2019-12-10 CN CN201911256477.5A patent/CN111300735A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001277305A (en) * | 2000-03-31 | 2001-10-09 | Piolax Inc | Producing method for resin hose fitted with connector |
| CN2672410Y (en) * | 2004-01-18 | 2005-01-19 | 大庆油田长垣管业有限公司 | Steel skeleton reinforced plastic composite pipe of plastic positioning nail |
| CN201325135Y (en) * | 2009-04-22 | 2009-10-14 | 华创天元实业发展有限责任公司 | Framework positioning device with framework plastic composite pipe part |
| CN204164569U (en) * | 2014-10-25 | 2015-02-18 | 安源管道实业有限公司 | A kind of composite steel-plastic pipe fitting not needing secondary sealing |
| CN204164568U (en) * | 2014-10-25 | 2015-02-18 | 安源管道实业有限公司 | A kind of composite steel-plastic pipe fitting realizing self-fluxing nature sealing |
| CN204471732U (en) * | 2015-01-18 | 2015-07-15 | 福建省海耀工程管道制造有限责任公司 | A kind of mould of steel skeleton plastic clad pipe part |
| CN208730177U (en) * | 2018-08-06 | 2019-04-12 | 中国石油天然气集团有限公司 | A kind of steel frame polyethylene compound pipe electric melting sleeve framework positioning device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112238567A (en) * | 2020-09-27 | 2021-01-19 | 安源管道实业股份有限公司 | Steel-plastic composite pipe framework positioning device and method without secondary processing |
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| PB01 | Publication | ||
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| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20211230 Address after: 163453 Heilongjiang Province, Daqing City Ranghulu District No. 263 South Central Avenue Applicant after: DAQING PETROLEUM ADMINISTRATION Co.,Ltd. Applicant after: CHINA NATIONAL PETROLEUM Corp. Applicant after: Daqing Oilfield Kunlun Group Co.,Ltd. Address before: 163453 Heilongjiang Province, Daqing City Ranghulu District No. 263 South Central Avenue Applicant before: DAQING PETROLEUM ADMINISTRATION Co.,Ltd. Applicant before: Daqing Oilfield Kunlun Group Co.,Ltd. |
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| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20200619 |