CN112622287B - Electric smelting bypass saddle-shaped pipe fitting welding thermal deformation regulation and control method - Google Patents
Electric smelting bypass saddle-shaped pipe fitting welding thermal deformation regulation and control method Download PDFInfo
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- CN112622287B CN112622287B CN202011389657.3A CN202011389657A CN112622287B CN 112622287 B CN112622287 B CN 112622287B CN 202011389657 A CN202011389657 A CN 202011389657A CN 112622287 B CN112622287 B CN 112622287B
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- bypass
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- main body
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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
- 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
- B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
- B29C65/24—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
- B29C65/30—Electrical means
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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
- 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
- B29C66/5224—Joining tubular articles for forming fork-shaped connections, e.g. for making Y-shaped pieces
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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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
- B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
- B29C66/91411—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the parts to be joined, e.g. the joining process taking the temperature of the parts to be joined into account
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/10—Nuclear fusion reactors
Abstract
The invention provides a method for regulating and controlling welding thermal deformation of an electric smelting bypass saddle-shaped pipe fitting, which comprises the following steps of: (1) The bypass main body is injection-molded by adopting a plastic injection molding process, and the temperature-control shape memory alloy is embedded in the bypass main body in the injection molding process of the bypass main body; (2) Extruding and embedding the electric heating wire on a saddle-shaped arc welding surface of the pipeline connecting part; (3) The bypass main body is bound on the main gas pipeline, the electric heating wire is electrified, the electric heating wire heats to melt the material at the saddle-shaped arc welding surface, and the bypass main body and the main gas pipeline are welded together. The invention can reduce the uneven distortion of temperature by the elliptical spiral wire distribution, and can control the residual distortion by the temperature control shape memory alloy.
Description
Technical Field
The invention belongs to the technical field of welding thermal deformation regulation and control, and particularly relates to a self-adaptive control method for welding thermal deformation of an electric smelting bypass saddle-shaped pipe fitting.
Background
Natural gas is one of clean and efficient energy sources in cities, and the most convenient conveying mode is pipeline conveying. Compared with metal gas transmission and distribution pipelines, the Polyethylene (PE) gas pipeline has the comprehensive advantages of stable mechanical property, chemical corrosion resistance, weldability, environmental protection, long service life, light weight, easy processing and forming, low transportation and installation cost and the like, has the popularization rate of over 90 percent in the countries such as British, denmark, france and the like, and is also popularized and applied in large quantities in newly built medium-pressure and low-pressure gas transmission and distribution pipelines in China. However, one of the important problems in the practical use of the pipeline made of the material is the technical problem of connecting the operated pipeline with the newly-built branch pipeline. According to the requirements of CJJ63-2018 polyethylene gas pipeline engineering technical standards, PE gas pipeline connection adopts electric melting connection (electric melting bearing connection and electric melting saddle connection) or hot melting connection, and threaded connection and bonding are not adopted. The electric smelting bypass saddle-shaped connection is a common mode in the gas pipeline pressure-bearing non-stop connection.
The structural parts of the conventional PE electric melting bypass saddle-shaped pipe fitting (saddle pipe for short) comprise an electric melting cover cap, a sealing ring, a bypass main body, a drilling tool, a tool support body and electric heating wires, wherein the wires of the electric heating wires on the saddle pipe are circular wires on a spatial cylindrical surface, and the wire distances of the electric heating wires in all directions are the same. The method for connecting the main gas pipeline with pressure without stopping gas comprises the following working principles: firstly, the saddle pipe is bound on a main gas pipeline, at the moment, the electric heating wire is electrified, the electric heating wire heats and melts PE materials to enable the saddle pipe and the main gas pipeline to be welded together in a melting mode, holes are formed in the main gas pipeline under pressure without stopping gas after welding is completed, at the moment, a drilling tool descends through thread fit rotation and drills holes in the main gas pipeline, sealing rings are guaranteed to seal all leakage channels between the tool and a tool support body, between the tool support body and a bypass main body, after holes are drilled, the tool is screwed up, an electric melting cover cap is covered, and therefore the holes are formed in the main gas pipeline under pressure without stopping gas.
PE electric smelting bypass saddle pipe fitting among the prior art has following problem: the welding quality of the saddle pipe and the main pipeline is poor due to the uneven deformation caused by uneven temperature distribution in the fusion welding process, and the defects of cracks and the like can occur at the welding seam, so that the gas leakage is caused.
Disclosure of Invention
The invention aims to solve the technical problems and provides a self-adaptive control method for welding thermal deformation of an electric smelting bypass saddle-shaped pipe fitting.
In order to achieve the purpose, the invention adopts the following technical scheme:
a welding thermal deformation regulation and control method for an electric smelting bypass saddle-shaped pipe fitting comprises the following steps:
(1) The bypass main body is injection-molded by adopting a plastic injection molding process, and the temperature-control shape memory alloy is embedded inside the bypass main body in the injection molding process of the bypass main body:
the bypass main body comprises a drilling pipeline and a bypass branch pipe communicated with the drilling pipeline, a saddle-shaped pipeline connecting part is arranged at one end of the drilling pipeline, the temperature control shape memory alloy is embedded in the pipeline connecting part, the thermal deformation direction of the temperature control shape memory alloy is opposite to the thermal stress deformation direction of the pipeline connecting part, the pipeline connecting part is provided with a saddle-shaped arc welding surface, and a pipe hole is formed in the saddle-shaped arc welding surface of the drilling pipeline;
(2) The electric heating wire is extruded and embedded on the saddle-shaped arc welding surface of the pipeline connecting part:
the heating wires are arranged in an elliptical spiral line form, and the long axis of the elliptical spiral line is parallel to the axial direction of a main gas pipeline welded with the pipeline connecting part;
(3) The bypass main body is bound on the main gas pipeline, the electric heating wire is electrified, the electric heating wire heats to melt the material at the saddle-shaped arc welding surface, and the bypass main body and the main gas pipeline are welded together.
Preferably, the wire distance of the electric heating wire along the circumferential direction of the main gas pipeline is x, the wire distance of the electric heating wire along the axial direction of the main gas pipeline is y, x is more than or equal to 0.5mm and less than or equal to 3.5mm, and x is more than or equal to 0.8 and less than 1.0.
Preferably, the number of winding turns of the electric heating wire is n, and n is more than or equal to 15 turns and less than or equal to 40 turns.
Preferably, the temperature-controlled shape memory alloys are provided in plural numbers, the temperature-controlled shape memory alloys are embedded around the pipe hole, and the plural temperature-controlled shape memory alloys are symmetrically arranged with respect to the pipe hole.
After the technical scheme is adopted, the invention has the following advantages:
according to the electric melting bypass saddle-shaped pipe fitting welding thermal deformation regulation and control method, the heating wires are arranged in the form of the elliptical spiral line, and the elliptical wire arrangement can homogenize the temperature field distribution, because the wire pitch of the heating wires arranged in the form of the elliptical spiral line is changed, the temperature is reduced when the wire pitch is increased, and the temperature is increased when the wire pitch is reduced, so that the temperature homogenization can be realized through the wire pitch change control arranged in the form of the elliptical spiral line. This improves the quality of the weld and also reduces uneven thermal stress deformation. In addition, the prior advanced intelligent material temperature control shape memory alloy is arranged near the saddle-shaped arc welding surface of the electric smelting bypass saddle-shaped pipe fitting, the temperature rises during welding, the temperature control shape memory alloy generates deformation stress along with the temperature according to the pre-designed direction, the deformation stress of the memory alloy can counteract the thermal stress during welding, the temperature returns to normal temperature after welding is completed, and the deformation stress of the memory alloy disappears, so that the shape is controlled. Therefore, the invention can reduce the distortion deformation of uneven temperature by the elliptical spiral wire arrangement and can control the residual distortion deformation by the temperature control shape memory alloy.
Drawings
FIG. 1 is a schematic structural diagram of an electric melting bypass saddle pipe fitting capable of adaptively controlling welding thermal deformation;
fig. 2 is an exploded view of an electrofusion bypass saddle pipe fitting with adaptive control of welding thermal deformation;
FIG. 3 is a cross-sectional view of an electrofusion bypass saddle pipe fitting with adaptive control of welding thermal deformation;
FIG. 4 is a schematic view of the saddle-shaped arc welding surface;
FIG. 5 is a schematic view of a temperature controlled shape memory alloy and wire layout;
in the figure:
1-a main gas pipeline; 2-a bypass body; 21-drilling a pipeline; 211-a pipe connection; 2111-saddle arc welding surface; 212-pore of pipe; 213-tool holder support groove; 22-a bypass branch; 3-drilling a cutter; 4-a tool holder; 41-a circular cylinder I; 42-a circular cylinder II; 43-circular cylinder three; 44-cylindrical grooves; 5-a bypass cap; 7-a first sealing ring; 8-a second sealing ring; 9-a third sealing ring; 10-a fourth seal ring; 11-a fifth sealing ring; 15-electric heating wire; 16-temperature controlled shape memory alloy; 17-welding wire.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples.
A method for regulating and controlling welding thermal deformation of an electric smelting bypass saddle-shaped pipe fitting comprises the following steps:
(1) The bypass main body is injection-molded by adopting a plastic injection molding process, and the temperature-control shape memory alloy is embedded inside the bypass main body in the injection molding process of the bypass main body:
the bypass main body comprises a drilling pipeline and a bypass branch pipe communicated with the drilling pipeline, a saddle-shaped pipeline connecting part is arranged at one end of the drilling pipeline, the temperature control shape memory alloy is embedded in the pipeline connecting part, the thermal deformation direction of the temperature control shape memory alloy is opposite to the thermal stress deformation direction of the pipeline connecting part, the pipeline connecting part is provided with a saddle-shaped arc welding surface, and a pipe hole is formed in the saddle-shaped arc welding surface of the drilling pipeline;
(2) The electric heating wire is extruded and embedded on the saddle-shaped arc welding surface of the pipeline connecting part:
the heating wires are arranged in an elliptical spiral line form, and the long axis of the elliptical spiral line is parallel to the axial direction of a main gas pipeline welded with the pipeline connecting part;
(3) The bypass main body is bound on the main gas pipeline, the electric heating wire is electrified, the electric heating wire heats to melt the material at the saddle-shaped arc welding surface, and the bypass main body and the main gas pipeline are welded together.
In the step (2), the wire distance of the electric heating wire along the circumferential direction of the main gas pipeline is x, x is more than or equal to 0.5mm and less than or equal to 3.5mm along the axial direction of the main gas pipeline, x is more than or equal to 0.8 and less than 1.0, and y is less than or equal to 1.0.
In the step (2), the number of winding turns of the electric heating wire is n, and n is not less than 15 turns and not more than 40 turns.
In the step (1), a plurality of temperature control shape memory alloys are arranged, the temperature control shape memory alloys are embedded around the pipe holes, and the plurality of temperature control shape memory alloys are symmetrically arranged around the pipe holes.
An electrofusion bypass saddle-shaped pipe fitting capable of adaptively controlling welding thermal deformation and welded with a main gas pipeline 1 according to the method comprises a bypass main body 2, a drilling tool 3, a tool bracket 4 and a bypass cap 5, as shown in figures 1-5.
The bypass body 2 includes a bore pipe 21 and a bypass branch pipe 22 communicating with the bore pipe 21. In this embodiment, the drill pipe 21 and the bypass branch 22 are integrally provided.
One end of the drilling pipeline 21 is provided with a saddle-shaped pipeline connecting part 211, the pipeline connecting part 211 is provided with a saddle-shaped arc welding surface 2111, and a pipe hole 212 is formed in the saddle-shaped arc welding surface 2111 of the drilling pipeline 21; the other end of the drilling pipe 21 is provided with the drilling tool 3, a tool carrier 4 and a bypass cap 5.
The drilling tool 3 is installed on the tool bracket 4, the tool bracket 4 is provided with a cylindrical groove 44 which is through from top to bottom, and the wall of the cylindrical groove 44 is provided with a thread for connecting the drilling tool 3.
The orifice of the drilling pipeline 21 is provided with a circle of tool bracket supporting grooves 213, and the tool bracket 4 comprises a first circular cylinder 41, a second circular cylinder 42 and a third circular cylinder 43 which are sequentially arranged from top to bottom. The diameter of the first annular cylinder 41 is matched with that of the cutter bracket supporting groove 213; the diameter of the second annular cylinder 42 is matched with the inner diameter of the drilling pipeline 21; the diameter of the circular ring cylinder three 43 is smaller than the inner diameter of the drill pipe 21. A circle of first sealing ring mounting groove is formed in the first annular cylinder 41, and a first sealing ring 7 is mounted in the first sealing ring mounting groove; and a circle of second sealing ring mounting groove is formed in the second circular cylinder 42, and a second sealing ring 8 is mounted in the second sealing ring mounting groove.
The cross section of the bypass cover cap 5 is concave, and the bypass cover cap 5 is in gapless fit with the cutter bracket 4 and the drilling pipeline 21. And a circle of third sealing ring mounting groove is formed in the bottom surface inside the bypass cover cap 5, and a third sealing ring 9 is mounted in the third sealing ring mounting groove.
The drilling tool 3 is provided with a circle of fourth sealing ring mounting groove and a circle of fifth sealing ring mounting groove respectively on the upper part and the lower part of the cylindrical surface matched with the cylindrical groove 44, and a fourth sealing ring 10 and a fifth sealing ring 11 are respectively mounted in the fourth sealing ring mounting groove and the fifth sealing ring mounting groove.
The saddle-shaped arc welding surface 2111 is provided with an electric heating wire 15 arranged in the form of an elliptical spiral line, and the long axis of the elliptical spiral line is parallel to the axial direction of the main gas pipeline 1. The wire distance of the heating wire 15 along the circumferential direction of the main gas pipeline 1 is x, the wire distance of the heating wire 15 along the axial direction of the main gas pipeline 1 is y, x is more than or equal to 0.5mm and less than or equal to 3.5mm, x is more than or equal to 0.8 and less than or equal to 1.0. In this example, x =1.0mm, x y =0.8.
Furthermore, the number of winding turns of the electric heating wire 15 is n, and n is not less than 15 turns and not more than 40 turns. The diameter of the electric heating wire 15 is d, and d is more than or equal to 0.3mm and less than or equal to 1.0mm. In this embodiment, the number of turns n =20 of the heating wire 15, and the diameter d =0.8mm of the heating wire 15. The bypass main body 2 is a PE pipe, and the heating wire 15 is pressed and embedded into the saddle-shaped arc welding surface 2111 of the pipe connecting portion 211 by a machine tool.
The pipe connecting part 211 is embedded with a temperature-controlled shape memory alloy 16 around the pipe hole 212, and the thermal deformation direction of the temperature-controlled shape memory alloy 16 is opposite to the thermal stress deformation direction of the pipe connecting part 211. The temperature-controlled shape memory alloy 16 is embedded in the bypass main body 2 in the injection molding process of the bypass main body 2.
Preferably, there are a plurality of temperature controlled shape memory alloys 16, and a plurality of temperature controlled shape memory alloys 16 are symmetrically disposed about the orifice 212. In this embodiment, the bypass body 2 is embedded with the temperature-controlled shape-memory alloy 16 and the welding wire 17 around the pipe hole 212. The temperature control shape memory alloy 16 is strip-shaped, and the temperature control shape memory alloy 16 is parallel to the axial direction of the main gas pipeline 1. Two of the temperature controlled shape memory alloys 16 are provided and two of the temperature controlled shape memory alloys 16 are symmetrically disposed about the orifice 212. The welding wires 17 are perpendicular to the axial direction of the main gas pipeline 1, and two welding wires 17 are arranged on the welding wires 17 and are symmetrical relative to the pipe hole 212.
The method for connecting the electric smelting bypass saddle-shaped pipe fitting with the main gas pipeline 1 under pressure without stopping gas and the working principle are as follows: firstly bind electric smelting bypass saddle pipe fitting on main gas pipeline 1, at this moment through switching on for heating wire 15, heating wire 15 generates heat and melts the PE material and makes electric smelting bypass saddle pipe fitting and main gas pipeline 1 melt-weld together, need take the area to not stop the gas trompil after the welding is accomplished, drilling tool 3 descends and drills the entrance to a cave on main gas pipeline 1 through screw-thread fit rotation this moment, this process drilling tool 3 and cutter bracket 4, all leak passage between cutter bracket 4 and bypass main part 2 all guarantee that the sealing washer is sealed, drilling tool 3 goes on after the hole has been bored, the bypass block 5 of covering, thereby the area is pressed not to stop the gas trompil.
According to the invention, the electric heating wires are arranged in the form of the elliptical spiral line, and the elliptical wire arrangement can homogenize the temperature field distribution, because the wire distance of the electric heating wires arranged in the form of the elliptical spiral line is changed, the temperature can be reduced when the wire distance is increased, and the temperature can be increased when the wire distance is reduced, so that the temperature homogenization can be realized through the control of the change of the wire distance arranged in the form of the elliptical spiral line. This improves the quality of the weld and also reduces uneven thermal stress deformation. In addition, the current advanced intelligent material temperature control shape memory alloy is arranged in the vicinity of the saddle-shaped arc welding surface of the electric smelting bypass saddle-shaped pipe fitting, when the temperature rises during welding, the temperature control shape memory alloy can generate deformation stress along with the temperature according to the pre-designed direction, the deformation stress of the memory alloy can counteract the thermal stress during welding, the temperature of the welding completion returns to the normal temperature, and the deformation stress of the memory alloy disappears, so that the shape control is realized. Therefore, the invention can reduce the distortion of uneven temperature by the elliptical spiral wire arrangement and control the residual distortion by the temperature control shape memory alloy.
Other embodiments of the present invention than the preferred embodiments described above will be apparent to those skilled in the art from the present invention, and various changes and modifications can be made therein without departing from the spirit of the present invention as defined in the appended claims.
Claims (3)
1. A method for regulating and controlling welding thermal deformation of an electric smelting bypass saddle-shaped pipe fitting is characterized by comprising the following steps:
(1) The bypass main body is injection-molded by adopting a plastic injection molding process, and the temperature-control shape memory alloy is embedded inside the bypass main body in the injection molding process of the bypass main body:
the bypass main body comprises a drilling pipeline and a bypass branch pipe communicated with the drilling pipeline, a saddle-shaped pipeline connecting part is arranged at one end of the drilling pipeline, the temperature control shape memory alloy is embedded in the pipeline connecting part, the thermal deformation direction of the temperature control shape memory alloy is opposite to the thermal stress deformation direction of the pipeline connecting part, the pipeline connecting part is provided with a saddle-shaped arc welding surface, and a pipe hole is formed in the saddle-shaped arc welding surface of the drilling pipeline;
(2) The electric heating wire is extruded and embedded on the saddle-shaped arc welding surface of the pipeline connecting part:
the heating wires are arranged in an elliptical spiral line form, and the long axis of the elliptical spiral line is parallel to the axial direction of a main gas pipeline welded with the pipeline connecting part;
(3) Binding the bypass main body on the main gas pipeline, electrifying the heating wire, heating the heating wire to melt the material at the saddle-shaped arc welding surface, and welding the bypass main body and the main gas pipeline together;
the wire distance of the heating wires along the circumferential direction of the main gas pipeline is x, the wire distance of the heating wires along the axial direction of the main gas pipeline is y, x is more than or equal to 0.5mm and less than or equal to 3.5mm, and x is more than or equal to 0.8 and less than 1.0.
2. The method for regulating and controlling the welding thermal deformation of the electric smelting bypass saddle-shaped pipe fitting according to claim 1, wherein the number of the winding turns of the electric heating wire is n, and n is more than or equal to 15 turns and less than or equal to 40 turns.
3. The method of claim 1, wherein the plurality of temperature-controlled shape memory alloys are embedded around the tubular hole, and the plurality of temperature-controlled shape memory alloys are symmetrically disposed about the tubular hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011389657.3A CN112622287B (en) | 2020-12-01 | 2020-12-01 | Electric smelting bypass saddle-shaped pipe fitting welding thermal deformation regulation and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011389657.3A CN112622287B (en) | 2020-12-01 | 2020-12-01 | Electric smelting bypass saddle-shaped pipe fitting welding thermal deformation regulation and control method |
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| Publication Number | Publication Date |
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| CN112622287A CN112622287A (en) | 2021-04-09 |
| CN112622287B true CN112622287B (en) | 2022-11-15 |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3595918B2 (en) * | 1996-09-18 | 2004-12-02 | 三菱樹脂株式会社 | Heating mat for forming electric fusion joints |
| JP5832248B2 (en) * | 2011-11-09 | 2015-12-16 | クボタシーアイ株式会社 | Fusion inner and branch saddle joint using the same |
| CN104061397B (en) * | 2014-05-08 | 2016-06-08 | 浙江庆发管业科技有限公司 | Cloth silk electric smelting saddle type bypass after one |
| CN204403652U (en) * | 2015-01-15 | 2015-06-17 | 浙江新杭宝管业有限公司 | A kind of naked wire formula electric melting pipe fittings |
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Address after: 315400 71 West Road, Hemudu Town, Yuyao City, Ningbo City, Zhejiang Province Applicant after: Ningbo Yuhua Industrial Co.,Ltd. Applicant after: China Jiliang University Address before: 315400 71 West Road, Hemudu Town, Yuyao City, Ningbo City, Zhejiang Province Applicant before: NINGBO YUHUA ELECTRIC APPLIANCE Co.,Ltd. Applicant before: China Jiliang University |
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