CN113997577A - Electric fusion welding machine and use method thereof - Google Patents

Electric fusion welding machine and use method thereof Download PDF

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Publication number
CN113997577A
CN113997577A CN202111247717.2A CN202111247717A CN113997577A CN 113997577 A CN113997577 A CN 113997577A CN 202111247717 A CN202111247717 A CN 202111247717A CN 113997577 A CN113997577 A CN 113997577A
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China
Prior art keywords
pipe
welding
wall
connecting pipe
electric
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CN202111247717.2A
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Chinese (zh)
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CN113997577B (en
Inventor
印军华
王遇春
邱天侠
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Shanghai Hydrau Mechanical & Electronic Engineering Co ltd
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Shanghai Hydrau Mechanical & Electronic Engineering Co ltd
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Publication of CN113997577A publication Critical patent/CN113997577A/en
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Publication of CN113997577B publication Critical patent/CN113997577B/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/20Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror"
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/02Preparation of the material, in the area to be joined, prior to joining or welding
    • B29C66/022Mechanical pre-treatments, e.g. reshaping
    • B29C66/0224Mechanical pre-treatments, e.g. reshaping with removal of material
    • B29C66/02241Cutting, e.g. by using waterjets, or sawing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/50General 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
    • B29C66/51Joining 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
    • B29C66/52Joining tubular articles, bars or profiled elements
    • B29C66/522Joining tubular articles
    • B29C66/5221Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

The utility model relates to a pipeline welding technical field discloses an electric fusion welding machine, which comprises a bod, be provided with output cable on the organism, the one end that the organism was kept away from to output cable is provided with the electric plug, the outside of organism is provided with the connecting pipe, all inlay on the both ends inner wall of connecting pipe and be equipped with a plurality of resistance wire, the outside of connecting pipe is provided with the interface that is used for pegging graft electric plug, the resistance wire is connected with the electric plug electricity, and whole process has convenient connection, the efficient effect of maintenance.

Description

Electric fusion welding machine and use method thereof
Technical Field
The application relates to the technical field of pipeline welding, in particular to an electric fusion welding machine and a using method thereof.
Background
The gas transmission pipeline is a gas pipeline used in daily life of people, is usually made of weldable PE (polyethylene), is buried underground for a long time, and needs unscheduled maintenance and inspection by workers.
Generally, some pipeline parts need to be repaired by maintenance personnel due to external environmental factors, such as artificial construction damage, geological movement damage, chemical corrosion damage and the like. In a conventional repair method, a portion with air leakage is cut off, and a new section of pipeline is welded to the cut portion, thereby achieving repair.
The existing fusion process generally uses a pipeline hot melting device to fuse one end of the pipeline, and simultaneously fuses one end of a newly connected pipeline, and the hot melting device is taken off after the hot melting device is heated to a certain temperature, so that the hot melting end of the newly connected pipeline is fused with the hot melting end of an old pipeline. After the above operation is completed, the hot welding of the old pipe at the other end of the cut portion is started. And finally, finishing the whole repairing process.
In view of the above-mentioned related art, the inventors consider that the fusion bonding is performed using the above-mentioned thermal fusion device, and the fusion bonding efficiency is low.
Disclosure of Invention
In order to improve the welding efficiency and the welding quality of pipelines, the application provides an electric fusion welding machine and a using method thereof.
In a first aspect, the application provides an electric fusion welding machine, adopts following technical scheme:
the utility model provides an electric fusion welding machine, includes the organism, be provided with output cable on the organism, the one end that the organism was kept away from to output cable is provided with the electric plug, the outside of organism is provided with the connecting pipe, all inlay on the both ends inner wall of connecting pipe and be equipped with a plurality of resistance wire, the outside of connecting pipe is provided with the interface that is used for pegging graft electric plug, the resistance wire is connected with the electric plug electricity.
Through adopting above-mentioned technical scheme, select suitable connecting pipe according to the diameter of maintenance pipeline, insert one section with gas pipeline cutting position and establish the inner chamber at the connecting pipe, the other end is inserted and is established in the other end inner chamber of connecting pipe, then insert the electric plug of organism and establish in the interface, make the welding machine organism circular telegram, the resistance wire generates heat, thereby the inner wall melting with the connecting pipe, simultaneously with the tip outer wall melting of gas pipeline, wait to cool off the back, the connecting pipe just fixed connection is in gas pipeline's cutting position department, whole process need not part the hot melt with two sections and connects, convenient connection, high maintenance efficiency.
Optionally, the connecting pipe includes a mounting pipe and welded pipes integrally formed at two ends of the mounting pipe, the thickness of the mounting pipe is greater than that of the welded pipes, the resistance wire is arranged on the inner wall of the welded pipes, and the insertion ports are arranged on the outer side walls of the welded pipes.
By adopting the technical scheme, the step is formed at the contact part of the welding pipe and the mounting pipe, and when the end part of the gas pipeline is inserted into the inner cavity of the mounting pipe, the welding pipe can be heated and welded until the end part of the gas pipeline is abutted against the end part of the mounting pipe.
Optionally, an annular groove is formed in the inner wall of one end, far away from the installation pipe, of the welding pipe, and a hot-melt adhesive tape is embedded in the annular groove.
Through adopting above-mentioned technical scheme, the welded tube is heated the back, and the hot melt adhesive tape is heated and melts to make the welded tube by the hot melt adhesive shutoff with the gap of old pipeline contact, the hot melt adhesive has increased the steadiness of being connected between welded tube and the old pipeline simultaneously.
Optionally, a heat-shrinkable tube is coaxially fixed on the outer wall of one end of the welding pipe, which is far away from the installation pipe.
By adopting the technical scheme, after the welding pipe is heated, heat is transferred to the position of the heat shrinkable tube, and the heat shrinkable tube is preheated and locked, so that the welding pipe and the gas pipeline are closed more tightly.
Optionally, a plurality of grooves are formed in the inner wall of the welded pipe, a plurality of expansion protrusions are fixed between adjacent grooves, spikes are integrally fixed to the tops of the expansion protrusions, and edges on two sides of the spikes are in a sawtooth shape.
Through adopting above-mentioned technical scheme, the bellied material of inflation is the expansion rubber material of preheating expansion, carries out the in-process that heats to the welded tube position, and the outer wall of old pipeline is also melted, and the glue solution after melting flows to the inner chamber of recess in, meets the protruding inflation of thermal expansion's inflation simultaneously for in the outer wall of old pipeline is inserted to the point thorn, and after the cooling, old pipeline and new pipeline are bonded each other, have further promoted pipe connection's stability.
Optionally, the body is provided with a fingerprint module, and the body is further provided with a control module for receiving a fingerprint module signal and driving the body to operate in an electric loop.
Through adopting above-mentioned technical scheme, can carry out the fingerprint to the staff in the company in advance and type, only the staff who types the fingerprint can have the authority and use the welding machine, and control module is used for comparing fingerprint information and control welding machine electric circuit and switches on.
Optionally, the body is further provided with a wireless module, the wireless module is used for receiving the fingerprint module signal, sending the fingerprint information to the information query platform for comparison, and feeding back a comparison result to the control module.
Through adopting above-mentioned technical scheme, wireless module is wireless network card, fingerprint module is the electric capacity fingerprint module, before the staff welds, input staff's fingerprint information through fingerprint module, control module is microprocessor, control module launches fingerprint information to special type operation information inquiry platform through wireless network card, compare whether fingerprint personnel have the employee's card, feed back to microprocessor after inquiring relevant information, microprocessor switches on the electric circuit of welding machine, thereby the staff alright carry out normal welding operation.
In a second aspect, the application provides a use method of an electric fusion welding machine, which adopts the following technical scheme:
optionally, a method for using the electric fusion welding machine comprises the following steps,
step 1, measuring and scribing;
step 2, removing oxide skin;
step 3, sleeving a connecting pipe;
step 4, connecting the electric fusion welding machine and starting up for authentication;
and 5, inputting welding parameters and welding.
Through adopting above-mentioned technical scheme, according to the length of hot melt pipe in advance, rule at the outer wall of gas pipeline, thereby confirm the gas pipeline and treat the degree of depth that the link stretched into the hot melt pipe intracavity, then strike off the cinder to stretching into end practical scraper of gas pipeline, then with the coaxial setting of connecting pipe between two sections free ends of gas pipeline, peg graft output cable's electric plug on the interface, the butt welder carries out the welding machine authentication, and input relevant welding parameter, thereby heat the resistance wire, make the both ends of connecting pipe and the mutual butt fusion of gas pipeline.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the whole process does not need to separately connect the two sections in a hot melting way, and has convenient connection and high maintenance efficiency.
The welded pipe is heated the back, and the hot melt adhesive tape is heated and melts to make the welded pipe by the hot melt adhesive shutoff with the gap of old pipeline contact, the hot melt adhesive has increased the steadiness of being connected between welded pipe and the old pipeline simultaneously.
Through setting up fingerprint module, wireless module and control module, prevent that no certificate personnel from using the welding machine.
Drawings
Fig. 1 is a schematic view of the overall structure of the present embodiment.
Fig. 2 is a sectional view of the connection pipe in the present embodiment.
Reference numerals: 1. a body; 2. an output cable; 3. an electric plug; 4. a connecting pipe; 5. a resistance wire; 6. an interface; 7. installing a pipe; 8. welding the pipe; 9. an annular groove; 10. hot melting adhesive tapes; 11. heat shrink tubing; 12. a groove; 13. an expansion lobe; 14. and (6) pricking.
Detailed Description
The present application is described in further detail below with reference to figures 1-2.
In a first aspect, an electric fusion welding machine is disclosed in an embodiment of the present application.
Referring to fig. 1, an electric fusion welding machine, including organism 1, organism 1 is three electric fusion welding machines, and the outer wall of organism 1 is provided with display screen and control knob, can observe the welding parameter information of welding machine and set up the interface through the display screen, and the outer wall of organism 1 still is connected with two output cable 2, and output cable 2 is used for exporting welding current.
Referring to fig. 1, be provided with fingerprint module on the organism 1 of welding machine, fingerprint module is the fingerprint identification module, installs on the casing of organism 1, and fingerprint module mainly used types user's fingerprint information, still is provided with control module in the casing of organism 1, and control module is the singlechip, also is microprocessor promptly, and mainly used handles fingerprint information to whether the control carries out the start operation to organism 1.
Referring to fig. 1, still be provided with wireless module on the organism 1, wireless module is wireless network card module, wireless module is used for networking whole organism 1 and external world each other, after the user types fingerprint information, control module looks for in sending fingerprint information to the information system of information inquiry platform and compares, personnel's identity when detecting fingerprint information has the electronic operation certificate, wireless module feeds back feedback information to control module department this moment, thereby control module control welding machine's electric circuit switches on, can realize normal operation, otherwise do not start.
Referring to fig. 1 and 2, an electrical plug 3 is fixed to one end of the output cable 2, which is far away from the machine body 1, a connecting pipe 4 is arranged on the outer side of the machine body 1, the connecting pipe 4 comprises an installation pipe 7 and fusion welding pipes 8 arranged at two ends of the installation pipe 7, the installation pipe 7 is made of ABS material, and the fusion welding pipes 8 are made of PE material. The inner wall integrated into one piece of fusion pipe 8 has resistance wire 5, be provided with interface 6 on the outer wall of fusion pipe 8, connect old gas pipeline's in-process, insert the tip of old gas pipeline in establishing the inner chamber of fusion pipe 8, make electric plug 3 peg graft in interface 6, thereby to resistance wire 5 ohmic heating, resistance wire 5 is with the inner wall melting of fusion pipe 8, make the outer wall of old gas pipeline also melting simultaneously, final cooling back alright make two sections pipeline butt fusion each other.
Referring to fig. 2, the thickness of the installation pipe 7 is twice the thickness of the welded pipe 8, so that the connection part of the welded pipe 8 and the installation pipe 7 is step-shaped, the step-shaped arrangement limits the depth of the gas pipeline extending into the welded pipe 8, at this time, the outer side of the gas pipeline can be scribed, and the outer wall between the scribing line and the end part of the gas pipeline can be subjected to scale scraping operation.
Referring to fig. 2, the inner wall of one end of the welding pipe 8 far away from the installation pipe 7 is milled with an annular groove 9, a solid-state hot-melt adhesive strip 10 is embedded in an inner cavity of the annular groove 9, but the welding pipe 8 is heated, so that the hot-melt adhesive strip 10 is heated and melted, a gap between the welding pipe 8 and the outer wall of the gas pipe is further blocked by hot melt adhesive, and meanwhile, the connection strength between the welding pipe 8 and the gas pipe is further enhanced.
Referring to fig. 2, the outer wall of the end, far away from the mounting pipe 7, of the welding pipe 8 is further coaxially provided with a heat shrink pipe 11, the heat shrink pipe 11 is fixedly connected with the welding pipe 8, at the moment, the gas pipeline is coaxially located in an inner cavity of the heat shrink pipe 11, and in the process of heating the welding pipe 8, the heat shrink pipe 11 is heated to shrink, so that a gap between the gas pipeline and the hot melting pipe is further blocked.
Referring to fig. 2, a plurality of recess 12 has been seted up to welded pipe 8's inner wall shanghai, the inner wall of recess 12 is circular-arcly, be fixed with expansion protrusion 13 between the adjacent recess 12, expansion protrusion 13's material is expansion rubber, can expand after the heat is met and swell, expansion protrusion 13 is fixed with spine 14 towards an organic whole on the one end lateral wall of gas pipeline, spine 14's both sides are the cockscomb structure, expansion protrusion 13 is after the thermal expansion, make spine 14 peg graft on the gas pipeline outer wall after the hot melt, the glue solution of gas pipeline outer wall hot melt form flows to the inner chamber of recess 12 simultaneously, when waiting for the hot melt to solidify, the outer wall of gas pipeline fuses together with welded pipe 8's inner wall, dismantle power down plug 3 this moment, just realize repairing maintenance to the gas pipeline.
In a second aspect, the present application discloses a method for using an electric fusion welding machine.
Referring to fig. 1 and 2, a method for using an electrofusion welder includes the steps of,
step 1, measuring and marking, namely inserting one end of a pipe 8 to be welded into the inner cavity of the welded pipe 8 until the end part of the gas pipeline abuts against the end face of the mounting pipe 7, and scratching scale marks on the outer wall of the gas pipeline.
And (3) after the scribing is finished, carrying out step 2, removing oxide skin, and scraping the outer wall of the gas pipeline between the scribing part and the end part of the gas pipeline by a scraper.
And then, step 3, sleeving a connecting pipe 4, sleeving the connecting pipe 4 between two free ends of the gas pipeline, and enabling two ends of the gas pipeline to be respectively inserted into the corresponding welded pipes 8.
And 4, connecting the electric fusion welding machine and performing start-up authentication, inserting the electric plug 3 on the output cable into the socket 6, so that personnel holding the employee card performs fingerprint identification start-up, and starting the electric fusion welding machine and keeping the electric fusion welding machine in a start-up state after the authentication is successful.
And finally, step 5, inputting welding parameters, inputting welder information in advance, pressing a determining button to return to a parameter mode page after completion of filling, setting welding voltage, welding time, cooling time, environment temperature and compensation temperature according to the parameter mode page, and selecting corresponding pipe diameters, materials and resistance values of pipe fittings. After the input of the corresponding parameters is finished, the welding machine enters a welding state and heats the resistance wire 5.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. An electric fusion welding machine, includes organism (1), its characterized in that: the improved engine body is characterized in that an output cable (2) is arranged on the engine body (1), an electric plug (3) is arranged at one end, away from the engine body (1), of the output cable (2), a connecting pipe (4) is arranged on the outer side of the engine body (1), a plurality of resistance wires (5) are embedded on the inner walls of the two ends of the connecting pipe (4), a plug-in port (6) for plugging the electric plug (3) is arranged on the outer side of the connecting pipe (4), and the resistance wires (5) are electrically connected with the electric plug (3).
2. An electrofusion welder according to claim 1, characterised in that: the connecting pipe (4) comprises a mounting pipe (7) and welding pipes (8) which are integrally formed at two ends of the mounting pipe (7), the thickness of the mounting pipe (7) is larger than that of the welding pipes (8), the resistance wire (5) is arranged on the inner wall of the welding pipes (8), and the insertion port (6) is arranged on the outer side wall of the welding pipes (8).
3. An electrofusion welder according to claim 2, characterised in that: an annular groove (9) is formed in the inner wall of one end, far away from the installation pipe (7), of the welding pipe (8), and a hot-melt adhesive tape (10) is embedded in the annular groove (9).
4. An electrofusion welder according to claim 2, characterised in that: and a heat-shrinkable tube (11) is coaxially fixed on the outer wall of one end of the welding pipe (8) far away from the installation pipe (7).
5. An electrofusion welder according to claim 2, characterised in that: a plurality of grooves (12) are formed in the inner wall of the welded pipe (8), a plurality of expansion protrusions (13) are fixed between every two adjacent grooves (12), spikes (14) are integrally fixed to the tops of the expansion protrusions (13), and edges of two sides of each spike (14) are in a sawtooth shape.
6. An electrofusion welder according to claim 1, characterised in that: the fingerprint machine is characterized in that a fingerprint module is arranged on the machine body (1), and a control module used for receiving a fingerprint module signal and driving an electric circuit of the machine body (1) to operate is further arranged on the machine body (1).
7. An electrofusion welder according to claim 6, characterised in that: the fingerprint identification device is characterized in that the machine body (1) is also provided with a wireless module, the wireless module is used for receiving fingerprint module signals, sending fingerprint information to the information inquiry platform for comparison, and feeding back a comparison result to the control module.
8. The use method of an electric fusion welding machine according to claim 1, characterized in that: comprises the following steps of (a) carrying out,
step 1, measuring and scribing;
step 2, removing oxide skin;
step 3, sleeving a connecting pipe (4);
step 4, connecting the electric fusion welding machine and starting up for authentication;
and 5, inputting welding parameters and welding.
CN202111247717.2A 2021-10-26 2021-10-26 Electric fusion welding machine and use method thereof Active CN113997577B (en)

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CN113997577B CN113997577B (en) 2023-09-26

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Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4331637A1 (en) * 1993-09-17 1995-03-23 Manibs Spezialarmaturen Process and apparatus for connecting pipe ends by means of a weldable socket
JPH09144977A (en) * 1995-11-27 1997-06-03 Tokyo Gas Co Ltd Electric fusion connector
CN104111124A (en) * 2014-08-06 2014-10-22 大唐双鸭山热电有限公司 Anti-corrosion device of temperature element of high-pressure cylinder of steam turbine
CN204042211U (en) * 2014-07-21 2014-12-24 江苏微特利电机制造有限公司 The cable pipe of explosion-proof electric apparatus casing
DE102013018434A1 (en) * 2013-11-04 2015-05-07 Markus Guldner Method for welding plastic pipes
CN109237185A (en) * 2018-10-30 2019-01-18 中国冶集团有限公司 A kind of connector anti-seepage method of HDPE plastic drainpipe
CN208474757U (en) * 2018-07-19 2019-02-05 福建祥云科创新型管业科技有限公司 A kind of tubing Double seal ring electric melting connection device
CN208764540U (en) * 2018-08-27 2019-04-19 宁波五力电热科技有限公司 A kind of water valve connector of air conditioner heat radiator
KR20200049077A (en) * 2018-10-31 2020-05-08 신영석 Electric Fusion Welding Pipe of Pipe
CN111347682A (en) * 2020-03-18 2020-06-30 高友华 Electric fusion welding method for PE pipe
CN112976592A (en) * 2021-02-24 2021-06-18 四川亚大塑料制品有限公司 Electric hot melting pipe fitting device with water pipeline and electric hot melting welding method with water pipeline
CN213512606U (en) * 2020-11-13 2021-06-22 承德盛金维保温材料有限公司 Double-deck hot melt interface insulation construction
CN213871593U (en) * 2020-10-06 2021-08-03 东莞市超杰硅橡胶制品有限公司 Rubber hose with quick joint
CN113513648A (en) * 2021-07-01 2021-10-19 山东东宏管业股份有限公司 Large-caliber steel wire mesh framework plastic composite pipe connecting structure and implementation method thereof

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4331637A1 (en) * 1993-09-17 1995-03-23 Manibs Spezialarmaturen Process and apparatus for connecting pipe ends by means of a weldable socket
JPH09144977A (en) * 1995-11-27 1997-06-03 Tokyo Gas Co Ltd Electric fusion connector
DE102013018434A1 (en) * 2013-11-04 2015-05-07 Markus Guldner Method for welding plastic pipes
CN204042211U (en) * 2014-07-21 2014-12-24 江苏微特利电机制造有限公司 The cable pipe of explosion-proof electric apparatus casing
CN104111124A (en) * 2014-08-06 2014-10-22 大唐双鸭山热电有限公司 Anti-corrosion device of temperature element of high-pressure cylinder of steam turbine
CN208474757U (en) * 2018-07-19 2019-02-05 福建祥云科创新型管业科技有限公司 A kind of tubing Double seal ring electric melting connection device
CN208764540U (en) * 2018-08-27 2019-04-19 宁波五力电热科技有限公司 A kind of water valve connector of air conditioner heat radiator
CN109237185A (en) * 2018-10-30 2019-01-18 中国冶集团有限公司 A kind of connector anti-seepage method of HDPE plastic drainpipe
KR20200049077A (en) * 2018-10-31 2020-05-08 신영석 Electric Fusion Welding Pipe of Pipe
CN111347682A (en) * 2020-03-18 2020-06-30 高友华 Electric fusion welding method for PE pipe
CN213871593U (en) * 2020-10-06 2021-08-03 东莞市超杰硅橡胶制品有限公司 Rubber hose with quick joint
CN213512606U (en) * 2020-11-13 2021-06-22 承德盛金维保温材料有限公司 Double-deck hot melt interface insulation construction
CN112976592A (en) * 2021-02-24 2021-06-18 四川亚大塑料制品有限公司 Electric hot melting pipe fitting device with water pipeline and electric hot melting welding method with water pipeline
CN113513648A (en) * 2021-07-01 2021-10-19 山东东宏管业股份有限公司 Large-caliber steel wire mesh framework plastic composite pipe connecting structure and implementation method thereof

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