CN102720901A - Electromagnetic induction welding steel-plastic composite pipe connection kit - Google Patents

Electromagnetic induction welding steel-plastic composite pipe connection kit Download PDF

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Publication number
CN102720901A
CN102720901A CN2012101194274A CN201210119427A CN102720901A CN 102720901 A CN102720901 A CN 102720901A CN 2012101194274 A CN2012101194274 A CN 2012101194274A CN 201210119427 A CN201210119427 A CN 201210119427A CN 102720901 A CN102720901 A CN 102720901A
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CN
China
Prior art keywords
composite pipe
conductive metal
steel
plastic
plastic composite
Prior art date
Application number
CN2012101194274A
Other languages
Chinese (zh)
Inventor
杨蒙
Original Assignee
杨蒙
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 杨蒙 filed Critical 杨蒙
Priority to CN2012101194274A priority Critical patent/CN102720901A/en
Publication of CN102720901A publication Critical patent/CN102720901A/en

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Abstract

The invention discloses an electromagnetic induction welding steel-plastic composite pipe connection kit, comprising a composite pipe, a tubular connector and a steel-plastic composite pipe sleeve. The composite pipe comprises a non-magnetic or weakly magnetic metal layer and a plastic layer. An annular birdsmouth is provided in at least one end of the tubular connector. When the composite pipe is inserted into the annular birdsmouth, the steel-plastic composite pipe sleeve is arranged between the composite pipe and the side wall of the annular birdsmouth. High magnetic metal rings are arranged and embedded in the side wall of the steel-plastic composite pipe sleeve. As a result of adopting the non-magnetic or weakly magnetic metal layer, the composite pipe shows no response or low response to intermediate and high frequency electromagnetic induction. The steel-plastic composite pipe sleeve is provided and embedded in the connector, and the magnetic metal material within the steel-plastic composite pipe set undergoes the intermediate and high frequency electromagnetic induction, the metal material heats and melts the plastics to make the material and the pipe closely integrated as one. The above scheme of the invention provides the electromagnetic induction welding connection possibility of the composite pipe which uses the non-magnetic or weakly magnetic metal as an enhancement layer.

Description

The electromagnetic inductive welding steel-plastic composite pipe connects external member

Technical field

The present invention relates to the composite steel-plastic pipe fitting field, particularly a kind of electromagnetic inductive welding steel-plastic composite pipe connects external member.

Background technique

In the existing technology; For the plastic-metal composite pipe that adopts the thermoplastic extrusion moulding; Installing of pipe fitting, generally adopt mechanical connection and hot melt Placement, it is to adopt electromagnetic inductive welding that a kind of mode is effectively reliably arranged in the hot melt Placement; The composite pipe that promptly will contain band magnetic metal layer earlier inserts the socket end of thermoplastic link; And making the socket end of the controlled heating melting of band magnetic metal layer thermoplastic link of composite pipe through the electromagnetic induction generating means, the indirect heating plastics make it fusion and fuse into one like this, reach the purpose that hot melt connects composite pipe and link.

But see; The metal material that present composite pipe mainly adopts comprises: steel (iron), aluminium, aluminum alloy, stainless steel; Except that steel (iron) has good magnetic conduction ability, aluminium, aluminum alloy, 304 stainless steels of the purposes that is usually used in feeding water all belong to low permeability magnetic material; Electromagnetic induction is not responded or weak response, and the possibility of the metal of magnetic conduction or weak permeability is not little so adopt the heating of medium-high frequency induction heating technique aluminium, aluminum alloy and 304 stainless steels etc.

Summary of the invention

The present invention is in order to overcome defective in the above-mentioned existing technology, provides a kind of efficient, reliable, is connected firmly, and anti-stress is strong, good airproof performance, and installation efficiency is high, and the electromagnetic inductive welding steel-plastic composite pipe that Applicable scope is extensive connects external member.

For achieving the above object, connect external member according to the invention provides a kind of electromagnetic inductive welding steel-plastic composite pipe, comprising: composite pipe, tubular connection and steel-plastic composite pipe cover, composite pipe comprises: not magnetic conduction or weak magnetic conductive metal layer and plastic layer; The two ends of tubular connection offer the ring-type birdsmouth respectively; When composite pipe was pegged graft into the ring-type birdsmouth, steel-plastic composite pipe was set between the sidewall of said composite pipe and ring-type birdsmouth; The sidewall of steel-plastic composite pipe cover is pre-buried to be provided with high magnetic conductive metal ring.

In the technique scheme, an end of steel-plastic composite pipe cover offers the ring-type welding mouth with the adaptive grafting of composite pipe.

In the technique scheme, being arranged as of the not magnetic conduction of composite pipe or weak magnetic conductive metal layer and plastic layer: magnetic conduction or weak magnetic conductive metal layer are for outer, and plastic layer is an internal layer; Perhaps magnetic conduction or weak magnetic conductive metal layer are not internal layer, and plastic layer is outer; Perhaps not magnetic conduction or weak magnetic conductive metal layer between the two layers of plastic layer.

In the technique scheme, also be not provided with bonding PUR between magnetic conduction or weak magnetic conductive metal layer and the plastic layer.

In the technique scheme, magnetic conduction or weak magnetic conductive metal layer are not 304 stainless steels, aluminum or aluminum alloy.

In the technique scheme, high magnetic conductive metal ring comprises: big high magnetic conductive metal ring and little high magnetic conductive metal ring, the pre-buried outer wall inboard that is arranged on ring-type welding mouth of big high magnetic conductive metal ring, the pre-buried inner wall that is arranged on ring-type welding mouth of little high magnetic conductive metal ring.

In the technique scheme, the material of high magnetic conductive metal ring is a ferrous material.

In the technique scheme, ferrous material is iron hoop, helical iron wire or the steel wire welded mesh with holes of punching.

In the technique scheme, the plastic materials of steel-plastic composite pipe cover is for being fit to said composite pipe and the adaptive PUR of tubular connection.

Compared with prior art; The present invention has following beneficial effect: electromagnetic inductive welding steel-plastic composite pipe of the present invention connects the composite pipe of external member owing to adopt not magnetic conduction or weak magnetic conductive metal layer; Do not respond or weak response for the medium-high frequency electromagnetic induction; Can't adopt medium-high frequency electromagnetic induction heating mode to carry out hot melt and connect,, realize the employing electromagnetic welding through the high magnetic conductive metal ring of pre-buried segment in pipe box; Simultaneously, in the tube wall of composite pipe the outside simultaneously with the ring-type welding mouth welding of pipe box, improved the soundness and the sealing that connect greatly; In addition, the anti-stress of this composite pipe fitting is strong, and good airproof performance is easy to use, and is applied widely, and is special in the less composite pipe of internal diameter, and it is fastening especially firmly, sealing is especially good, anti-stress is especially strong.

Description of drawings

Fig. 1 is the three-dimensional decomposition texture schematic representation that electromagnetic inductive welding steel-plastic composite pipe of the present invention connects external member;

Fig. 2 is the sectional structure schematic representation that electromagnetic inductive welding steel-plastic composite pipe of the present invention connects the link of external member;

Fig. 3 is the sectional structure schematic representation that electromagnetic inductive welding steel-plastic composite pipe of the present invention connects pipe box first embodiment of external member;

Fig. 4 is the sectional structure schematic representation that electromagnetic inductive welding steel-plastic composite pipe of the present invention connects pipe box second embodiment of external member;

Fig. 5, Fig. 6 and Fig. 7 are the cross-sectional schematic of three kinds of structures of the electromagnetic inductive welding steel-plastic composite pipe of the present invention composite pipe that is connected external member;

Fig. 8 is the assembly structure schematic representation that electromagnetic inductive welding steel-plastic composite pipe of the present invention connects external member;

Fig. 9 is the A portion structure for amplifying schematic representation of Fig. 8;

Figure 10 is the sectional structure schematic representation that electromagnetic inductive welding steel-plastic composite pipe of the present invention connects the enlarging processing composite pipe of external member;

In conjunction with the accompanying drawing following reference character of mark above that:

1-composite pipe, 11-be magnetic conduction or weak magnetic conductive metal layer not, 12-plastic layer, 13-flared tube, 2-link, 24-ring-type birdsmouth, 31-thermoplastic body, the big high magnetic conductive metal ring of 32-, the little high magnetic conductive metal ring of 33-, 34-ring-type welding mouth.

Embodiment

Below in conjunction with accompanying drawing, an embodiment of the present invention is described in detail, but is to be understood that protection scope of the present invention does not receive the restriction of embodiment.

As shown in Figure 1, electromagnetic inductive welding steel-plastic composite pipe of the present invention connects external member and comprises: composite pipe 1, link 2 and pipe box 3.Composite pipe 1 comprises: not magnetic conduction or weak magnetic conductive metal layer 11 and plastic layer 12, magnetic conduction or weak magnetic conductive metal layer 11 are not 304 stainless steels, aluminum or aluminum alloy.Wherein, magnetic conduction or weak magnetic conductive metal layer 11 are not outer, and plastic layer 12 is internal layer (as shown in Figure 5); Perhaps magnetic conduction or weak magnetic conductive metal layer 11 are not internal layer, and plastic layer 12 is outer (as shown in Figure 6); Also not magnetic conduction or weak magnetic conductive metal layer 11 (as shown in Figure 7) between two layers of plastic layer 12.The relative position flexible arrangement of magnetic conduction or weak magnetic conductive metal layer 11 and plastic layer 12 not is not limited to not magnetic conduction or weak magnetic conductive metal layer 11 and is positioned at skin.

As shown in Figure 2, link 2 is a tubulose, and right ends offers axially extended ring-type birdsmouth 24 respectively.

As shown in Figure 3, pipe box 3 is a tubulose, and concrete structure comprises: with the thermoplastic body 31 of ring-type birdsmouth 24 adaptive grafting, big high magnetic conductive metal ring 32 and little high magnetic conductive metal ring 33.Wherein, the left end of thermoplastic body 31 offers axially extended ring-type welding mouth 34, composite pipe 1 and these ring-type welding mouth 34 adaptive grafting.The material of big high magnetic conductive metal ring 32 and little high magnetic conductive metal ring 33 is band magnetic metal, the big high magnetic conductive metal ring 32 pre-buried outer wall inboards that are arranged on this ring-type welding mouth 34, the little high magnetic conductive metal ring 33 pre-buried inner wall that are arranged on this ring-type welding mouth 34.

As shown in Figure 4, pipe box 3 is a tubulose, and concrete structure can also comprise: thermoplastic body 35 and the pre-buried high magnetic conductive metal ring 36 that is arranged in the thermoplastic body 35; During assembling, pipe box 3 uses one, is arranged between ring-type birdsmouth 24 inwalls of composite pipe 1 inwall and link 2 or between ring-type birdsmouth 24 outer walls of composite pipe 1 outer wall and link 2; Pipe box 3 also can use two simultaneously, lays respectively between ring-type birdsmouth 24 inwalls of composite pipe 1 inwall and link 2 or between ring-type birdsmouth 24 outer walls of composite pipe 1 outer wall and link 2.

As shown in Figure 8; The electromagnetic inductive welding steel-plastic composite pipe of present embodiment connects external member in use; At first an end of composite pipe 1 is inserted in the ring-type welding mouth 34 of pipe box 3, make the tube wall of composite pipe 1 between big high magnetic conductive metal ring 32 and little high magnetic conductive metal ring 33.Then; With the pipe box that the is plugged with composite pipe 13 whole ring-type birdsmouths 24 that insert link 2; Again with the electromagnetic induction generating means be arranged on connecting end ring-type birdsmouth 24 near, during electromagnetic induction generating means energising work, the medium-high frequency electromagnetic oscillations wave energy that welding machine produces enough makes the big high magnetic conductive metal ring 32 of pipe box 3 and the tube wall of little high magnetic conductive metal ring 33 controlled heat fused pipe boxes 3; Composite pipe 1 is fixed on the link 2 through pipe box 3 firmly, is sealedly connected.As shown in Figure 9, owing to ring-type welding mouth 34 weldings of outside while in the tube wall of composite pipe 1, improved the soundness and the sealing that connect greatly with pipe box 3.

When adopting two composite pipes to connect; The composite pipe 1 of an other end also is connected with link 2 through pipe box 3 according to step recited above; Equally the electromagnetic induction generating means is arranged on the annex of the ring-type birdsmouth 24 of another connecting end; The high-frequency electromagnetic oscillating wave that produces through the electromagnetic induction generating means makes it pass through pipe box 3 and link 2 mutual weldings, like this, through link 2 two composite pipes is communicated with.

Shown in figure 10; For the less composite pipe 1 of caliber, the flared tube 13 that goes out to be suitable for connecting after can adopting enlarging to handle is no matter the shape of composite pipe how; As long as the ring-type welding mouth 34 of opening part and pipe box 3 is suitable, just can adopt the application's link that it is communicated with.

Electromagnetic inductive welding steel-plastic composite pipe of the present invention connects the composite pipe of external member owing to adopt not magnetic conduction or weak magnetic conductive metal layer, and the high magnetic conductive metal ring of pre-buried segment in pipe box only, makes the electromagnetic inductive welding of composite pipe of this type become possibility; Simultaneously, in the tube wall of composite pipe the outside simultaneously with the ring-type welding mouth welding of pipe box, improved the soundness and the sealing that connect greatly; In addition, the anti-stress of this composite pipe fitting is strong, and good airproof performance is easy to use, and is applied widely, and is special in the less composite pipe of internal diameter, and it is fastening especially firmly, sealing is especially good, anti-stress is especially strong.

More than disclosedly be merely several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.

Claims (9)

1. an electromagnetic inductive welding steel-plastic composite pipe connects external member, it is characterized in that, comprising: composite pipe, tubular connection and steel-plastic composite pipe cover, and said composite pipe comprises: not magnetic conduction or weak magnetic conductive metal layer and plastic layer; At least one end of said tubular connection offers the ring-type birdsmouth; When said composite pipe was pegged graft into said ring-type birdsmouth, said steel-plastic composite pipe was set between the sidewall of said composite pipe and said ring-type birdsmouth; The sidewall of said steel-plastic composite pipe cover is pre-buried to be provided with high magnetic conductive metal ring.
2. electromagnetic inductive welding steel-plastic composite pipe according to claim 1 connects external member, it is characterized in that, an end of said steel-plastic composite pipe cover offers the ring-type welding mouth with the adaptive grafting of said composite pipe.
3. electromagnetic inductive welding steel-plastic composite pipe according to claim 1 connects external member, and it is characterized in that being arranged as of the not magnetic conduction of said composite pipe or weak magnetic conductive metal layer and plastic layer: magnetic conduction or weak magnetic conductive metal layer are skin, and plastic layer is an internal layer; Perhaps magnetic conduction or weak magnetic conductive metal layer are not internal layer, and plastic layer is outer; Perhaps not magnetic conduction or weak magnetic conductive metal layer between the two layers of plastic layer.
4. electromagnetic inductive welding steel-plastic composite pipe according to claim 1 connects external member, it is characterized in that, also is provided with bonding PUR between said not magnetic conduction or weak magnetic conductive metal layer and the plastic layer.
5. electromagnetic inductive welding steel-plastic composite pipe according to claim 1 connects external member, it is characterized in that said not magnetic conduction or weak magnetic conductive metal layer are 304 stainless steels, aluminum or aluminum alloy.
6. connect external member according to each described electromagnetic inductive welding steel-plastic composite pipe in the claim 1 to 5; It is characterized in that; Said high magnetic conductive metal ring comprises: big high magnetic conductive metal ring and little high magnetic conductive metal ring; The pre-buried outer wall inboard that is arranged on said ring-type welding mouth of said big high magnetic conductive metal ring, the pre-buried inner wall that is arranged on said ring-type welding mouth of said little high magnetic conductive metal ring.
7. electromagnetic inductive welding steel-plastic composite pipe according to claim 1 connects external member, it is characterized in that the material of said high magnetic conductive metal ring is a ferrous material.
8. electromagnetic inductive welding steel-plastic composite pipe according to claim 7 connects external member, it is characterized in that, said ferrous material is iron hoop, helical iron wire or the steel wire welded mesh with holes of punching.
9. electromagnetic inductive welding steel-plastic composite pipe according to claim 1 connects external member, it is characterized in that, the plastic materials of said steel-plastic composite pipe cover is for being fit to said composite pipe and the adaptive PUR of tubular connection.
CN2012101194274A 2012-04-20 2012-04-20 Electromagnetic induction welding steel-plastic composite pipe connection kit CN102720901A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2012101194274A CN102720901A (en) 2012-04-20 2012-04-20 Electromagnetic induction welding steel-plastic composite pipe connection kit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2012101194274A CN102720901A (en) 2012-04-20 2012-04-20 Electromagnetic induction welding steel-plastic composite pipe connection kit

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CN102720901A true CN102720901A (en) 2012-10-10

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Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104776332A (en) * 2014-09-28 2015-07-15 嘉兴山蒲照明电器有限公司 LED (Light-Emitting Diode) fluorescent lamp
US9587817B2 (en) 2014-09-28 2017-03-07 Jiaxing Super Lighting Electric Appliance Co., Ltd LED tube lamp
US9609711B2 (en) 2014-09-28 2017-03-28 Jiaxing Super Lighting Electric Appliance Co., Ltd. LED tube lamp
US9611984B2 (en) 2015-04-02 2017-04-04 Jiaxing Super Lighting Electric Appliance Co., Ltd. LED tube lamp
US9618168B1 (en) 2014-09-28 2017-04-11 Jiaxing Super Lighting Electric Appliance Co., Ltd LED tube lamp
US9618166B2 (en) 2014-09-28 2017-04-11 Jiaxing Super Lighting Electric Applianc Co., Ltd. LED tube lamp
US9629211B2 (en) 2014-09-28 2017-04-18 Jiaxing Super Lighting Electric Appliance Co., Ltd. LED tube lamp with improved compatibility with an electrical ballast
US9625137B2 (en) 2014-09-28 2017-04-18 Jiaxing Super Lighting Electric Appliance Co., Ltd LED tube light with bendable circuit board
CN106764208A (en) * 2017-03-13 2017-05-31 武汉金牛经济发展有限公司 The connection method of the double hot melt pipe fittings of electromagnetism and steel-plastics composite pipe
CN107131376A (en) * 2017-06-06 2017-09-05 武汉金牛经济发展有限公司 The connection method of the double hot melt assembling pipe fittings of electromagnetism and steel-plastics composite pipe
US9794990B2 (en) 2014-09-28 2017-10-17 Jiaxing Super Lighting Electric Appliance Co., Ltd. LED tube lamp with improved compatibility with an electrical ballast
US9851073B2 (en) 2015-04-02 2017-12-26 Jiaxing Super Lighting Electric Appliance Co., Ltd. LED tube light with diffusion layer
US9879852B2 (en) 2014-09-28 2018-01-30 Jiaxing Super Lighting Electric Appliance Co., Ltd LED tube lamp
US9885449B2 (en) 2014-09-28 2018-02-06 Jiaxing Super Lighting Electric Appliance Co., Ltd LED tube lamp
US9890909B2 (en) 2014-09-28 2018-02-13 Jiaxing Super Lighting Electric Appliance Co., Ltd. LED tube lamp
US9897265B2 (en) 2015-03-10 2018-02-20 Jiaxing Super Lighting Electric Appliance Co., Ltd. LED tube lamp having LED light strip
US9903537B2 (en) 2014-12-05 2018-02-27 Jiaxing Super Lighting Electric Appliance Co., Ltd LED tube lamp
US9945520B2 (en) 2014-09-28 2018-04-17 Jiaxing Super Lighting Electric Appliance Co., Ltd LED tube lamp
US9955587B2 (en) 2015-04-02 2018-04-24 Jiaxing Super Lighting Electric Appliance Co., Ltd. LED tube lamp
CN108119709A (en) * 2016-11-30 2018-06-05 罗贤想 A kind of steel plastic compount pipe connections
US10021742B2 (en) 2014-09-28 2018-07-10 Jiaxing Super Lighting Electric Appliance Co., Ltd LED tube lamp
US10190749B2 (en) 2015-04-02 2019-01-29 Jiaxing Super Lighting Electric Appliance Co., Ltd. LED tube lamp
US10288272B2 (en) 2016-03-17 2019-05-14 Zhejiang Super Lighting Electric Appliance Co., Ltd Curved LED tubular lamp
US10299333B2 (en) 2014-09-28 2019-05-21 Jiaxing Super Lighting Electric Appliance Co., Ltd. LED tube lamp
US10514134B2 (en) 2014-12-05 2019-12-24 Jiaxing Super Lighting Electric Appliance Co., Ltd LED tube lamp
US10560989B2 (en) 2014-09-28 2020-02-11 Jiaxing Super Lighting Electric Appliance Co., Ltd LED tube lamp
US10634337B2 (en) 2014-12-05 2020-04-28 Jiaxing Super Lighting Electric Appliance Co., Ltd LED tube lamp with heat dissipation of power supply in end cap
US10641435B2 (en) 2015-09-02 2020-05-05 Jiaxing Super Lighting Electric Appliance Co., Ltd LED tube lamp

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CN202056455U (en) * 2011-01-31 2011-11-30 徐焕松 Aluminum-plastic composite pipe electromagnetic melting connection structure
CN102338254A (en) * 2011-05-04 2012-02-01 杨蒙 Pre-socket induction heating butt fusion plastic pipe fitting

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Publication number Priority date Publication date Assignee Title
DE2628318A1 (en) * 1976-06-24 1977-12-29 Karl Heinz Vahlbrauk Sleeve-like resilient plastic seal with heating elements - for spigot and socket joint for plastic-coated pipes
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CN202056455U (en) * 2011-01-31 2011-11-30 徐焕松 Aluminum-plastic composite pipe electromagnetic melting connection structure
CN102338254A (en) * 2011-05-04 2012-02-01 杨蒙 Pre-socket induction heating butt fusion plastic pipe fitting

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US10021742B2 (en) 2014-09-28 2018-07-10 Jiaxing Super Lighting Electric Appliance Co., Ltd LED tube lamp
CN106369368A (en) * 2014-09-28 2017-02-01 浙江山蒲照明电器有限公司 LED fluorescent lamp
CN104776332B (en) * 2014-09-28 2017-02-01 嘉兴山蒲照明电器有限公司 LED (Light-Emitting Diode) fluorescent lamp
US9587817B2 (en) 2014-09-28 2017-03-07 Jiaxing Super Lighting Electric Appliance Co., Ltd LED tube lamp
US9609711B2 (en) 2014-09-28 2017-03-28 Jiaxing Super Lighting Electric Appliance Co., Ltd. LED tube lamp
CN104776332A (en) * 2014-09-28 2015-07-15 嘉兴山蒲照明电器有限公司 LED (Light-Emitting Diode) fluorescent lamp
US9618168B1 (en) 2014-09-28 2017-04-11 Jiaxing Super Lighting Electric Appliance Co., Ltd LED tube lamp
US9618166B2 (en) 2014-09-28 2017-04-11 Jiaxing Super Lighting Electric Applianc Co., Ltd. LED tube lamp
US9629211B2 (en) 2014-09-28 2017-04-18 Jiaxing Super Lighting Electric Appliance Co., Ltd. LED tube lamp with improved compatibility with an electrical ballast
US9625137B2 (en) 2014-09-28 2017-04-18 Jiaxing Super Lighting Electric Appliance Co., Ltd LED tube light with bendable circuit board
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US10560989B2 (en) 2014-09-28 2020-02-11 Jiaxing Super Lighting Electric Appliance Co., Ltd LED tube lamp
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US9851073B2 (en) 2015-04-02 2017-12-26 Jiaxing Super Lighting Electric Appliance Co., Ltd. LED tube light with diffusion layer
US10047932B2 (en) 2015-04-02 2018-08-14 Jiaxing Super Lighting Electric Appliance Co., Ltd. LED tube light with LED leadframes
US9955587B2 (en) 2015-04-02 2018-04-24 Jiaxing Super Lighting Electric Appliance Co., Ltd. LED tube lamp
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US10641435B2 (en) 2015-09-02 2020-05-05 Jiaxing Super Lighting Electric Appliance Co., Ltd LED tube lamp
US10288272B2 (en) 2016-03-17 2019-05-14 Zhejiang Super Lighting Electric Appliance Co., Ltd Curved LED tubular lamp
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CN108119709A (en) * 2016-11-30 2018-06-05 罗贤想 A kind of steel plastic compount pipe connections
CN106764208A (en) * 2017-03-13 2017-05-31 武汉金牛经济发展有限公司 The connection method of the double hot melt pipe fittings of electromagnetism and steel-plastics composite pipe
CN107131376A (en) * 2017-06-06 2017-09-05 武汉金牛经济发展有限公司 The connection method of the double hot melt assembling pipe fittings of electromagnetism and steel-plastics composite pipe

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