CN110667127A - Process method for butt welding of plastic pipe with functional layer - Google Patents
Process method for butt welding of plastic pipe with functional layer Download PDFInfo
- Publication number
- CN110667127A CN110667127A CN201911005896.1A CN201911005896A CN110667127A CN 110667127 A CN110667127 A CN 110667127A CN 201911005896 A CN201911005896 A CN 201911005896A CN 110667127 A CN110667127 A CN 110667127A
- Authority
- CN
- China
- Prior art keywords
- plastic
- wall layer
- wall
- plastic pipe
- annular groove
- 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.)
- Pending
Links
Images
Classifications
-
- 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
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/40—Applying molten plastics, e.g. hot melt
- B29C65/42—Applying molten plastics, e.g. hot melt between pre-assembled parts
-
- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
- B29C66/022—Mechanical pre-treatments, e.g. reshaping
-
- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/52—Joining tubular articles, bars or profiled elements
- B29C66/522—Joining tubular articles
- B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
The invention discloses a butt welding process method for a plastic pipe with a functional layer, which belongs to the technical field of composite pipe welding, wherein the plastic pipe is a composite pipe consisting of an inner wall layer and an outer wall layer, and the inner wall layer of the plastic pipe is a weldable functional material; the method comprises the following steps: and processing a V-shaped groove and an annular groove on the butt joint end face of the plastic pipes, aligning the butt joint of the end faces of the two plastic pipes, and welding the butt joint end faces. By processing the annular groove on the end face of the plastic pipe, when the butt joint end faces of the two plastic pipes are welded, the extruded outer wall layer material can enter the annular groove at the junction of the inner wall layer and the outer wall layer, so that the inner wall layer can be welded into a continuous whole. The invention solves the problem that the inner wall functional layer plastic has a discontinuous functional layer under the flowing extrusion of a thicker outer wall layer material because the inner wall layer material is turned over to the inner wall and the outer wall of the pipeline under the action of welding pressure after being heated, and ensures the service performance of the plastic pipe connection part.
Description
Technical Field
The invention belongs to the technical field of composite pipe welding, and particularly relates to a process method for butt welding of plastic pipes with functional layers.
Background
With the rapid development of infrastructure, pipes made of various plastics and metal or non-metal reinforcing materials are widely used. Along with the increase of the application of composite pipelines, functional pipes on the inner wall are more and more, but the functional materials on the inner wall generally cannot be continuous at the interface, so that the breakpoint of functional characteristics exists at the interface of the pipeline. As a tube butt joint technology of a continuous tube, a V-groove processing butt welding process is provided in patent 201510140808.4, which is a tube butt welding process method of a continuous tube, and is used for continuously welding a steel tube, but how to solve the characteristic continuity problem of an inner wall functional material is not specified.
Taking a wear-resistant pipe as an example, the market mainly takes flange connection, and the continuous importance of wear resistance is not considered at the pipe connection position. The butt joint of the pipes is made of non-wear-resistant materials, so that the pipe forms a weak point of a pipeline system, and is easy to damage at the joint when media such as mortar, ore pulp and the like are conveyed.
Disclosure of Invention
The invention aims to provide a butt welding process method for plastic pipes with functional layers, and aims to solve the technical problems that functional materials of inner walls of the functional pipes at pipeline joints cannot be continuous and functional characteristic breakpoints exist in the prior art.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a plastic pipe with a functional layer is butt-welded, wherein the plastic pipe is a multilayer composite pipe and comprises an inner wall layer and an outer wall layer, and the inner wall layer of the plastic pipe is made of a weldable functional material; the method comprises the following steps:
processing the butt joint end face of the plastic pipe: processing a V-shaped groove and an annular groove on the butt joint end face of the plastic pipe, processing an annular groove concentric with the plastic pipe on the end face of the plastic pipe, wherein the annular groove is arranged at the junction of the inner wall layer and the outer wall layer;
(II) butting and aligning the end faces of the two plastic pipes;
and (III) welding the butt joint end face.
Preferably, the plastic of the outer wall layer of the plastic pipe is high-density polyethylene.
Preferably, the functional material of inner wall layer is the material that has wear-resisting, heat-resisting or antistatic function.
Preferably, the annular groove is formed in the end face of the outer wall layer, the inner side inner wall of the annular groove is close to the outer circle of the inner wall layer, and the inner cavity of the annular groove is used for filling hot-melt outer-layer plastics during welding.
Preferably, when the annular groove is machined in the step (one), a plurality of inner supporting pieces are arranged in the inner hole at the end part of the plastic pipe.
Preferably, in the step (III), a plastic welding machine matched with the plastic pipe is applied, and the inner wall layer is welded firstly and then the outer wall layer is welded; the strength of the welding seam meets the requirement of hydrostatic test.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: compared with the prior art, the annular groove is processed on the end surface of the plastic pipe, when the butt joint end surfaces of the two plastic pipes are welded, the extruded outer wall layer material enters the annular groove at the junction of the inner wall layer and the outer wall layer, and the inner wall layer can be ensured to be welded into a continuous whole. The invention solves the problem that the inner wall functional layer plastic has a discontinuous functional layer under the flowing extrusion of a thicker outer wall layer material because the inner wall layer material is turned over to the inner wall and the outer wall of the pipeline under the action of welding pressure after being heated, and ensures the service performance of the plastic pipe connection part.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic view of a prior art plastic pipe in layers;
FIG. 2 is a half-sectional view of a plastic tubing provided in accordance with an embodiment of the present invention;
in the figure: 1-inner wall layer, 2-outer wall layer and 3-annular groove.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A functional layer-containing plastic pipe butt welding process method is provided, wherein the plastic pipe is a multilayer composite pipe and comprises an inner wall layer 1 and an outer wall layer 2, and the process method is shown in figure 1; the inner wall layer 1 of the plastic pipe is made of a weldable functional material; the method comprises the following steps:
processing the butt joint end face of the plastic pipe: processing a V-shaped groove and an annular groove 3 on the butt joint end surface of the plastic pipe, and turning the annular groove 3 which is concentric with the plastic pipe on the end surface of the plastic pipe; the annular groove 3 is located at the junction of the outer wall layer 2 and the inner wall layer 1 of the plastic pipe, as shown in fig. 2. The annular groove 3 is arranged on the end face of the outer wall layer 2, the inner side inner wall of the annular groove 3 is close to the excircle of the inner wall layer 1, the inner cavity of the annular groove 3 is used for filling hot-melted outer plastic during welding, and the size of the annular groove is optimal when the cavity is filled with the outer high-density polyethylene plastic during welding.
(II) butting and aligning the end faces of the two plastic pipes;
and (III) welding the butt joint end face. And (3) welding the inner wall layer and then welding the outer wall layer by using a plastic welding machine matched with the plastic pipe. The plastic welding of the inner wall functional layer is preferably ensured to be a continuous whole, and the continuity of the inner wall functional layer of the plastic pipe is ensured.
Wherein, the parameters of the V-shaped groove processing, the pipe butt-joint assembly and the butt-joint welding process can refer to the data in the 'pipe butt-joint welding process method of the continuous pipe' (201510140808.4). The butt welding equipment adopts the existing butt welding machine for pure plastic pipes with corresponding specifications.
Aligning the plastic pipes in a butt welding machine, fixing and clamping, placing an end face lathe tool between the end faces of the two plastic pipes, applying certain pressure, and milling the end faces; the annular groove 3 on the end surface is processed before leaving the factory, and as shown in fig. 2, the position of the annular groove is a functional material tightly attached to the inner wall layer; the specific size can be determined according to the specification of the pipe and the welding process.
The welding process is characterized in that butt joint pressure is set according to the provisions in the standard, the butt joint welding pressure P2 is disclosed below, the strength of a welding seam meets the provisions of a hydrostatic test specified in GB/T13663.2, and the pressure on an engineering site meets the corresponding engineering specifications.
P2=π*P*e*（D-e）/S +P0
P: the force to be applied per unit butt joint area is 0.18 +/-0.02N/mm2
P0: system drag pressure
e: wall thickness
D: outer diameter
S: the total effective area of the piston of the execution cylinder of the hydraulic system of the welding machine tool.
Welding process parameters such as heat absorption time, flanging height and the like in the welding process refer to the welding process standard of the pure plastic pipe and are specified in the GB/T13663.2 standard, and the strength of the welding line meets the requirement of a hydrostatic test.
In one embodiment of the present invention, the plastic of the outer wall layer 2 of the plastic pipe is high density polyethylene. The functional material of the inner wall layer 1 is a material with wear-resisting, heat-resisting or antistatic functions, and adopts a wear-resisting material layer, a heat-resisting material layer, an antistatic material layer and the like.
Further optimizing the technical scheme, when the annular groove 3 is machined in the step (I), a plurality of inner supporting pieces are arranged in the inner hole at the end part of the plastic pipe. The roundness of the plastic pipe is ensured by the inner supporting piece.
According to the existing plastic pipe butt welding technology, when the plastic pipe with the functional layer is in butt welding connection, the heated end plastic can generate flanging to the inner wall and the outer wall of the pipeline under the action of welding pressure, and the functional layer discontinuity can occur to the inner wall functional layer plastic under the flowing extrusion of the thicker outer layer high-density polyethylene plastic, so that the use performance of the pipe connection part is influenced. The outer wall layer of the plastic pipe is made of high-density polyethylene, and the inner wall layer is a functional layer, such as a wear-resistant material layer, a heat-resistant material layer, an antistatic material layer and the like. In order to ensure the continuity of the plastic of the inner wall functional layer during the welding of the plastic pipe, the annular groove is turned on the end surface of the pipe close to the functional layer, so that a circumferential cavity is formed between the polyethylene of the outer wall layer and the functional layer of the inner wall layer, the extruded outer layer polyethylene can enter the cavity of the annular groove during the welding of the pipe, the functional material of the inner wall layer can be welded into a continuous whole, and the size of the turned circumferential annular groove cavity is optimal to fill the polyethylene during the welding, so that a space is provided for the flowing of the outer layer polyethylene during the welding, and the continuity of the inner wall functional layer is also ensured.
In the description above, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and thus the present invention is not limited to the specific embodiments disclosed above.
Claims (6)
1. A plastic pipe with a functional layer is a multilayer composite pipe and comprises an inner wall layer and an outer wall layer, and the plastic pipe is characterized in that the inner wall layer is made of a weldable functional material; the method comprises the following steps:
processing the butt joint end face of the plastic pipe: processing a V-shaped groove and an annular groove on the butt joint end face of the plastic pipe, processing an annular groove concentric with the plastic pipe on the end face of the plastic pipe, wherein the annular groove is arranged at the junction of the inner wall layer and the outer wall layer;
the end faces of the two plastic pipes are butted and aligned;
and welding the butt end faces.
2. The process of butt welding functional plastic pipe as claimed in claim 1, wherein the plastic in the outer wall layer is high density polyethylene.
3. The butt welding process method for plastic pipes with functional layers according to claim 1, wherein the functional material of the inner wall layer is a material with wear-resistant, heat-resistant or antistatic functions.
4. The butt welding process method for plastic pipes with functional layers according to claim 1, wherein the annular groove is formed in the end face of the outer wall layer, the inner side inner wall of the annular groove is close to the outer circle of the inner wall layer, and the inner cavity of the annular groove is used for filling outer plastic which is hot melted during welding.
5. The butt welding process for plastic pipes with functional layers according to claim 1, wherein a plurality of inner supporting members are provided in the inner holes of the end portions of the plastic pipes when the annular grooves are machined in the step (one).
6. The butt welding process method for plastic pipes with functional layers according to claim 1, wherein in the third step, a plastic welding machine matched with the plastic pipes is used to weld the inner wall layer and then weld the outer wall layer; the strength of the welding seam meets the requirement of hydrostatic test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911005896.1A CN110667127A (en) | 2019-10-22 | 2019-10-22 | Process method for butt welding of plastic pipe with functional layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911005896.1A CN110667127A (en) | 2019-10-22 | 2019-10-22 | Process method for butt welding of plastic pipe with functional layer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110667127A true CN110667127A (en) | 2020-01-10 |
Family
ID=69083937
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911005896.1A Pending CN110667127A (en) | 2019-10-22 | 2019-10-22 | Process method for butt welding of plastic pipe with functional layer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110667127A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113442445A (en) * | 2021-05-17 | 2021-09-28 | 浙江英普智能制造有限公司 | Automatic welding machine for ultrafiltration membrane column and end cover |
| CN113457450A (en) * | 2021-05-17 | 2021-10-01 | 浙江英普智能制造有限公司 | Automatic welding machine for ultrafiltration membrane component |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58219018A (en) * | 1982-06-14 | 1983-12-20 | Shinko Kosen Kogyo Kk | Jointing method of synthetic resin tube |
| CN87104983A (en) * | 1986-07-22 | 1988-02-03 | 保罗·邦纳赞莱 | Polyethylene tubing with integral heating resistors connected by electric welding |
| ATA36787A (en) * | 1986-05-26 | 1989-11-15 | Bilas Andor Ing | CONNECTING RING OR SLEEVE FOR USE WITH A COMPONENT, IN PARTICULAR TUBE AND METHOD FOR CONNECTING A SLEEVE OR RING TO A COMPONENT |
| JP2002240153A (en) * | 2000-12-07 | 2002-08-28 | Sekisui Chem Co Ltd | Method for connecting composite pipes |
| US20030080552A1 (en) * | 2001-10-26 | 2003-05-01 | Massimo Genoni | Multilayer tube with butt weldable end and welding method for a multilayer tube |
| CN104816076A (en) * | 2015-03-27 | 2015-08-05 | 西安石油大学 | Tube-to-tube butt welding technological method of coiled tube |
| CN105402542A (en) * | 2015-12-18 | 2016-03-16 | 浙江伟星新型建材股份有限公司 | Connecting structure and connecting method for reinforced composite pipes |
| CN206738798U (en) * | 2017-06-01 | 2017-12-12 | 河北北塑管业有限公司 | A kind of HDPE tubing for being easy to sweat soldering |
-
2019
- 2019-10-22 CN CN201911005896.1A patent/CN110667127A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58219018A (en) * | 1982-06-14 | 1983-12-20 | Shinko Kosen Kogyo Kk | Jointing method of synthetic resin tube |
| ATA36787A (en) * | 1986-05-26 | 1989-11-15 | Bilas Andor Ing | CONNECTING RING OR SLEEVE FOR USE WITH A COMPONENT, IN PARTICULAR TUBE AND METHOD FOR CONNECTING A SLEEVE OR RING TO A COMPONENT |
| CN87104983A (en) * | 1986-07-22 | 1988-02-03 | 保罗·邦纳赞莱 | Polyethylene tubing with integral heating resistors connected by electric welding |
| JP2002240153A (en) * | 2000-12-07 | 2002-08-28 | Sekisui Chem Co Ltd | Method for connecting composite pipes |
| US20030080552A1 (en) * | 2001-10-26 | 2003-05-01 | Massimo Genoni | Multilayer tube with butt weldable end and welding method for a multilayer tube |
| CN104816076A (en) * | 2015-03-27 | 2015-08-05 | 西安石油大学 | Tube-to-tube butt welding technological method of coiled tube |
| CN105402542A (en) * | 2015-12-18 | 2016-03-16 | 浙江伟星新型建材股份有限公司 | Connecting structure and connecting method for reinforced composite pipes |
| CN206738798U (en) * | 2017-06-01 | 2017-12-12 | 河北北塑管业有限公司 | A kind of HDPE tubing for being easy to sweat soldering |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113442445A (en) * | 2021-05-17 | 2021-09-28 | 浙江英普智能制造有限公司 | Automatic welding machine for ultrafiltration membrane column and end cover |
| CN113457450A (en) * | 2021-05-17 | 2021-10-01 | 浙江英普智能制造有限公司 | Automatic welding machine for ultrafiltration membrane component |
| CN113457450B (en) * | 2021-05-17 | 2024-04-26 | 浙江英普智能制造有限公司 | Automatic welding machine for ultrafiltration membrane component |
| CN113442445B (en) * | 2021-05-17 | 2024-07-02 | 浙江英普智能制造有限公司 | Automatic welding machine for ultrafiltration membrane column and end cover |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108971710B (en) | Connecting and processing technology of tube and tube plate | |
| CN110131511B (en) | RTP pipe electric melting and hot melting unchanged-size connecting structure and connecting method thereof | |
| CN103008988A (en) | Method for welding anticorrosion steel pipeline with no internal repaired mouth | |
| CN100543349C (en) | Multiunit tube joint and processing method thereof | |
| CN112780875B (en) | B-type sleeve suitable for repairing large wall thickness difference butt-joint girth weld defects and machining method thereof | |
| CN110667127A (en) | Process method for butt welding of plastic pipe with functional layer | |
| WO1991017362A1 (en) | Joining of metallic pipe lined with thermoplastic polymer | |
| WO2009083937A2 (en) | Insulated pipelines and methods of construction and installation thereof | |
| CN110744181A (en) | Automatic welding process for large-diameter long-distance pipeline | |
| CN208058234U (en) | Heavy antisepsis combustion gas moulds crossover sub with steel | |
| CN111059394A (en) | Wear-resistant steel wire mesh pipe butt welding pipe fitting | |
| CN102052539B (en) | Pipeline electric fusing joint adopting tenon-and-mortise structure and electric fusing welding method | |
| CN107420666B (en) | A kind of connection method between steel pipeline inside lining anti-corrosive construction section | |
| CN113400696B (en) | Method for connecting large-caliber high-pressure fiber reinforced flexible composite pipe | |
| CN201787257U (en) | Electric melting and hot melting double-protection connecting structure of polyolefin plastic pipes | |
| CN201827578U (en) | Pipeline electric melting joint adopting mortise and tenon joint structure | |
| JPH0256990B2 (en) | ||
| CN211344268U (en) | Oil gas conveying pipe | |
| CN200993289Y (en) | Composite pipe joint | |
| CN102734574A (en) | Fitting assembly and safety lock line connection system including the assembly | |
| WO2017072886A1 (en) | Resin piping member, resin pipe joint, and piping production method | |
| RU2686129C1 (en) | Method for connection of metal pipes with inner plastic lining | |
| WO2017037541A1 (en) | Improvements relating to polymer lined pipes | |
| CN111251634A (en) | Pipe externally wound continuous fiber prepreg tape reinforced inclined joint elbow and manufacturing method thereof | |
| CN217056771U (en) | Glass fiber reinforced plastic type connecting structure of threaded steel pipe |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200110 |