CN110260077A - A kind of butt welding eccentric reducing elbow and its production technology used in industrial pipeline turning - Google Patents
A kind of butt welding eccentric reducing elbow and its production technology used in industrial pipeline turning Download PDFInfo
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- CN110260077A CN110260077A CN201910518337.4A CN201910518337A CN110260077A CN 110260077 A CN110260077 A CN 110260077A CN 201910518337 A CN201910518337 A CN 201910518337A CN 110260077 A CN110260077 A CN 110260077A
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- Prior art keywords
- elbow
- eccentric
- eccentric reducing
- reducing elbow
- pipe
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- 238000003466 welding Methods 0.000 title claims abstract description 50
- 238000007514 turning Methods 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 238000005516 engineering process Methods 0.000 title claims description 9
- 238000000465 moulding Methods 0.000 claims description 47
- 238000000034 method Methods 0.000 claims description 14
- 238000000748 compression moulding Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000003638 chemical reducing agent Substances 0.000 claims description 5
- 238000005452 bending Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 238000003754 machining Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052738 indium Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
- F16L13/02—Welded joints
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L43/00—Bends; Siphons
- F16L43/001—Bends; Siphons made of metal
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L43/00—Bends; Siphons
- F16L43/02—Bends; Siphons adapted to make use of special securing means
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The invention discloses a kind of butt welding eccentric reducing elbows used in industrial pipeline turning, including first pipe (1), eccentric reducing elbow (2) and second pipe (3), wherein first pipe (1) is the straight tube of up and down direction, second pipe (3) is the straight tube of left and right directions, it is big opening end that eccentric reducing elbow (2), which is lower end, right end is 90 degree of bend pipes at osculum end, the big opening end of upper end connection eccentric reducing elbow (2) of first pipe (1), the left end of osculum end connection third pipeline (3) of eccentric reducing elbow (2).Two conduit components used using first curved conduit component of butt welding eccentric reducing instead of original, reduce a girth joint of pipeline, the working efficiency for improving construction site saves the X-ray detection expense an of girth joint, another effect for reducing weld seam is to improve the safety of pipeline.
Description
Technical field
The invention belongs to reducing elbow correlative technology fields, and in particular to it is a kind of used in industrial pipeline turning to being partially welded
Heart reducing elbow and its production technology.
Background technique
Original structure is illustrated before changing in conjunction with the butt welding eccentric reducing elbow for being used in industrial pipeline turning in attached drawing 6 and 7
Figure is as can be seen that when needing when eccentric and variable diameter requirement is realized at the turning of Industrial Metal pipeline, by butt welding eccentric reducing
Elbow is weldingly connected with pipe ends, realizes and eccentric and variable diameter design requirement can be completed using a kind of conduit component, when
It is required that first connecting elbow with pipeline butt welding when realizing eccentric and variable diameter requirement after pipeline turning, reuse eccentric different
Diameter pipe is connect with elbow butt welding, then again connect pipeline with eccentric reducer butt welding.
Existing butt welding eccentric reducing elbow and its process units technology used in industrial pipeline turning is asked there are following
Topic: it needs to design and purchases two conduit components, i.e. elbow and eccentric reducer, and its butt welding is connected, this makes pipeline more
One girth joint, needs to increase weld job workload and the X-ray detection to weld seam.
Summary of the invention
The purpose of the present invention is to provide a kind of used in the butt welding eccentric reducing elbow at industrial pipeline turning and its production
Technique, to solve the problems mentioned in the above background technology: needing to design and purchase two conduit components, is i.e. elbow and bias is different
Diameter pipe, and its butt welding is connected, this has made more than pipeline a girth joint, needs to increase weld job workload and to weld seam
X-ray detection.
To achieve the above object, the invention provides the following technical scheme:
A kind of butt welding eccentric reducing elbow used in industrial pipeline turning, including first pipe, eccentric reducing elbow and
Second pipe, wherein first pipe is the straight tube of up and down direction, and second pipe is the straight tube of left and right directions, and eccentric reducing elbow is
90 degree of bend pipes that lower end is big opening end, right end is osculum end, the big opening end of the upper end connection eccentric reducing elbow of first pipe,
It is pair that the left end of the osculum end connection third pipeline of eccentric reducing elbow, eccentric reducing elbow and first pipe, which are attached form,
The type of attachment of weldering mode, second pipe and eccentric reducing elbow is butt welding mode.
The diameter of first pipe is 400mm, and the diameter of second pipe is 220mm, two open ends of eccentric reducing elbow
Linear distance be 707mm, the distance between two endpoints of outer convex surface of eccentric reducing elbow are 928mm, and eccentric reducing is curved
The distance between two endpoints in inside concave surface of head are 490mm, the big opening end central point of eccentric reducing elbow to osculum end section
Linear distance be 500mm, the linear distance of the osculum end central point of eccentric reducing elbow to big opening end section is 500mm.
A kind of process units of the butt welding eccentric reducing elbow used in industrial pipeline turning, process units include the first one-tenth
Type device and the second molding machine；First molding machine includes the first hydraulic press, and arrangement up and down is provided on the first hydraulic press
The first upper mold and the first lower die, wherein the first lower die be plane mould, the first upper mold be inclined-plane mould, the left end height of inclined-plane mould
Greater than right end height, vertical positioning plate is provided between left section and left section of the first lower die of the first upper mold；Second molding dress
It sets including the second hydraulic press, the second upper mold and the second lower die arranged up and down is provided on the second hydraulic press, wherein under second
Mould is cavity plate, and the shape on the convex surface of the shape and eccentric reducing elbow of cavity plate is mutually coincide, and the second upper mold is punch-pin, the shape of punch-pin
The shape of the concave surface of shape and eccentric reducing elbow is mutually coincide, and second molding machine further includes having a core model, the core
The shape of mould and the hollow internal structure of eccentric reducing elbow are mutually coincide.
A kind of butt welding eccentric reducing elbow production technology used in industrial pipeline turning:
Step 1: processing eccentric reducing elbow；
It is eccentric different that processing is carried out using a kind of process units of butt welding eccentric reducing elbow used in industrial pipeline turning
Diameter elbow, process units include the first molding machine and the second molding machine；
Using secondary forming method, butt-welding elbow is first processed into eccentric elbow first, is then processed into eccentric elbow
Eccentric reducing elbow；
1.1, the butt-welding elbow for not carrying out end retaining wall on slope after a forming is placed in heating furnace after heating and is taken out, it is first
First butt-welding elbow is laid flat to press on the first molding machine and flattens its right end, making it is in the eccentric elbow of eccentric shape,
The open height of the height of eccentric elbow left end is constant, and the open height of right end is slightly less than the osculum end of final eccentric reducing elbow
Height, in order to finally shape compacting, the specific steps are as follows:
Butt-welding elbow is put into the first molding machine first and is pressed and molded, wherein the first molding machine includes first
Hydraulic press is provided with the first upper mold and the first lower die arranged up and down on the first hydraulic press, wherein the first lower die is plane mould,
First upper mold is inclined-plane mould, and the left end height of inclined-plane mould is greater than right end height, left section of left section of the first upper mold and the first lower die
Between be provided with vertical positioning plate, the stub end of eccentric reducer when positioning plate is molded for the first molding machine
Positioning, butt-welding elbow become eccentric elbow by the compression molding of the first molding machine；
1.2, molding eccentric elbow is put into the second molding machine and is pressed and molded again, is pressed and molded to be wanted
Seek the eccentric reducing elbow of size, the specific steps are as follows:
Eccentric elbow is put into the second molding machine and is pressed and molded, wherein the second molding machine includes second hydraulic
Machine is provided with the second upper mold and the second lower die arranged up and down on the second hydraulic press, wherein the second lower die is cavity plate, cavity plate
The shape on the convex surface of shape and eccentric reducing elbow is mutually coincide, and the second upper mold is punch-pin, and the shape and eccentric reducing of punch-pin are curved
The shape of the concave surface of head is mutually coincide, and second molding machine further includes having a core model, the shape and bias of the core model
The hollow internal structure of reducing elbow is mutually coincide；
First by 90 degree of eccentric rotating elbow, it is then packed into core model inside it, then allows eccentric elbow into second
In lower die, starting the second molding machine, the second upper mold pushes, and required diameter is made in the reducing side pressure deformed, thus
So that eccentric elbow compression molding is eccentric reducing elbow, the eccentric reducing elbow after the completion of final compacting reaches the bending of requirement
Radius and outer diameter must be heat-treated after the forming of eccentric reducing elbow, and its both ends carried out with the machining of welding groove, complete main
Manufacturing process；
Step 2: the stub end in eccentric reducing elbow welds first pipe；
Step 3: the stub end in eccentric reducing elbow welds second pipe；
Above-mentioned step two and step 3 sequence can exchange.
Compared with prior art, the present invention provides a kind of butt welding eccentric reducing elbow used in industrial pipeline turning and
Its process units is had following the utility model has the advantages that two used using first curved conduit component of butt welding eccentric reducing instead of original
A conduit component reduces a girth joint of pipeline, improves the working efficiency of construction site, saves a girth joint
X-ray detection expense, another effect for reducing weld seam are to improve the safety of pipeline.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example to be used to explain the present invention together, not be construed as limiting the invention, in the accompanying drawings:
Fig. 1 is a kind of butt welding eccentric reducing elbow structure schematic diagram used in industrial pipeline turning proposed by the present invention；
Fig. 2 is the side view of Fig. 1.
Fig. 3 the first forming device structure schematic diagram；
Fig. 4 the second forming device structure schematic diagram；
The second molding machine of Fig. 5 product is pressed and molded after schematic diagram；
Fig. 6 is traditional eccentric reducing elbow structure schematic diagram；
Fig. 7 is the side view of Fig. 6.
In figure:
First pipe 1, eccentric reducing elbow 2, second pipe 3；
First hydraulic press 101, the first upper mold 102, the first lower die 103, positioning plate 104；
Second hydraulic press 201, the second upper mold 202, the second lower die 203, core model 204.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 3-5 is please referred to, the present invention provides a kind of technical solution:
A kind of butt welding eccentric reducing elbow used in industrial pipeline turning, including first pipe 1, eccentric reducing elbow 2
With second pipe 3, wherein first pipe 1 is the straight tube of up and down direction, and second pipe 3 is the straight tube of left and right directions, eccentric reducing
Elbow 2 is 90 degree of bend pipes that lower end is big opening end, right end is osculum end, and the upper end of first pipe 1 connects eccentric reducing elbow 2
Big opening end, the left end of the osculum end connection third pipeline 3 of eccentric reducing elbow 2, eccentric reducing elbow 2 and first pipe 1 into
Row type of attachment is butt welding mode, and the type of attachment of second pipe 3 and eccentric reducing elbow 2 is butt welding mode.
Wherein: the diameter of first pipe 1 is 400mm, and the diameter of second pipe 3 is 220mm, the two of eccentric reducing elbow 2
The linear distance of a open end is 707mm, and the distance between two endpoints of outer convex surface of eccentric reducing elbow 2 are 928mm, partially
The distance between two endpoints in inside concave surface of heart reducing elbow 2 are 490mm, and the big opening end central point of eccentric reducing elbow 2 is extremely
The linear distance of osculum end section is 500mm, the linear distance of the osculum end central point of eccentric reducing elbow 2 to big opening end section
For 500mm.
A kind of butt welding eccentric reducing elbow production technology used in industrial pipeline turning:
Step 1: processing eccentric reducing elbow 2；
It is eccentric different that processing is carried out using a kind of process units of butt welding eccentric reducing elbow used in industrial pipeline turning
Diameter elbow, process units include the first molding machine and the second molding machine；
Using secondary forming method, butt-welding elbow is first processed into eccentric elbow first, is then processed into eccentric elbow
Eccentric reducing elbow；
1.1, the butt-welding elbow (concentric iso-diameter elbow) for not carrying out end retaining wall on slope after a forming is placed in heating furnace
In, be heated to be suitable for the metal material deformation temperature after take out, first on the first molding machine by butt-welding elbow lay flat into
Row pressure flattens its right end, and making it is in the eccentric elbow of eccentric shape, and the open height of the height of eccentric elbow left end is constant, right
The open height at end is slightly less than the height at the osculum end of final eccentric reducing elbow, in order to finally shape compacting, specific steps
It is as follows:
Butt-welding elbow is put into the first molding machine first and is pressed and molded, wherein the first molding machine includes first
Hydraulic press 101 is provided with the first upper mold 102 arranged up and down and the first lower die 103 on first hydraulic press 101, wherein first
Lower die 103 is plane mould, and the first upper mold 102 is inclined-plane mould, and the left end height of inclined-plane mould is greater than right end height, the first upper mold 102
Left section and left section of the first lower die 103 between be provided with vertical positioning plate 104, positioning plate 104 is used for the first molding machine
The positioning of the stub end of eccentric reducer when being molded, butt-welding elbow become inclined by the compression molding of the first molding machine
Heart elbow；
1.2, molding eccentric elbow is put into the second molding machine and is pressed and molded again, is pressed and molded to be wanted
Seek the eccentric reducing elbow of size, the specific steps are as follows:
Eccentric elbow is put into the second molding machine and is pressed and molded, wherein the second molding machine includes second hydraulic
Machine 201 is provided with the second upper mold 202 arranged up and down and the second lower die 203 on second hydraulic press, wherein the second lower die 203
For cavity plate, the shape on the convex surface of the shape and eccentric reducing elbow of cavity plate is mutually coincide, and the second upper mold 202 is punch-pin, punch-pin
The shape of the concave surface of shape and eccentric reducing elbow is mutually coincide, and second molding machine further includes having a core model 204, institute
The hollow internal structure of the shape and eccentric reducing elbow of stating core model 204 is mutually coincide.
First by 90 degree of eccentric rotating elbow, it is then packed into core model 204 inside it, then allows eccentric elbow into the
In two lower dies 203, start the second molding machine, the second upper mold 202 push, reducing side pressure deform be made required by it is straight
Diameter, so that eccentric elbow compression molding is eccentric reducing elbow, the eccentric reducing elbow after the completion of final compacting, which reaches, to be wanted
The bending radius and outer diameter asked must be heat-treated after the forming of eccentric reducing elbow, and its both ends carried out with the machining of welding groove,
Complete Chief manufacturing process.
Step 2: the stub end in eccentric reducing elbow 2 welds first pipe 1；
Step 3: the stub end in eccentric reducing elbow 2 welds second pipe 3.
Above-mentioned step two and step 3 sequence can exchange.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (4)
1. a kind of butt welding eccentric reducing elbow used in industrial pipeline turning, including first pipe (1), eccentric reducing elbow
(2) and second pipe (3), wherein first pipe (1) be up and down direction straight tube, second pipe (3) is the straight tube of left and right directions,
Eccentric reducing elbow (2) is 90 degree of bend pipes that lower end is big opening end, right end is osculum end, the upper end connection of first pipe (1)
The big opening end of eccentric reducing elbow (2), the left end of osculum end connection third pipeline (3) of eccentric reducing elbow (2), eccentric reducing
It is butt welding mode, the connection of second pipe (3) and eccentric reducing elbow (2) that elbow (2) and first pipe (1), which are attached form,
Form is butt welding mode；The diameter of first pipe is 400mm, and the diameter of second pipe is 220mm, two of eccentric reducing elbow
The linear distance of open end is 707mm, and the distance between two endpoints of outer convex surface of eccentric reducing elbow are 928mm, eccentric
The distance between two endpoints in inside concave surface of reducing elbow are 490mm, the big opening end central point of eccentric reducing elbow to osculum
The linear distance of end section is 500mm, and the linear distance in osculum end central point to the big opening end section of eccentric reducing elbow is
500mm。
2. a kind of butt welding eccentric reducing elbow used in industrial pipeline turning according to claim 1, it is characterised in that
Its process units includes the first molding machine and the second molding machine；First molding machine includes the first hydraulic press (101),
The first upper mold (102) arranged up and down and the first lower die (103) are provided on first hydraulic press (101), wherein the first lower die
It (103) is plane mould, the first upper mold (102) is inclined-plane mould, and the left end height of inclined-plane mould is greater than right end height, the first upper mold
(102) vertical positioning plate (104) are provided between left section and left section of the first lower die (103)；Second molding machine includes
Second hydraulic press (201) is provided with the second upper mold (202) arranged up and down and the second lower die (203) on the second hydraulic press,
In the second lower die (203) be cavity plate, the shape on the convex surface of the shape and eccentric reducing elbow of cavity plate is mutually identical, the second upper mold
It (202) is punch-pin, the shape of the concave surface of the shape and eccentric reducing elbow of punch-pin is mutually coincide, and second molding machine also wraps
A core model (204) is included, the shape of the core model (204) and the hollow internal structure of eccentric reducing elbow are mutually coincide.
3. a kind of butt welding eccentric reducing elbow used in industrial pipeline turning according to claim 1, it is characterised in that
Production technology is as follows:
Step 1: processing eccentric reducing elbow (2)；
Using secondary forming method, butt-welding elbow is first processed into eccentric elbow first, eccentric elbow is then processed into bias
Reducing elbow；
1.1, the butt-welding elbow for not carrying out end retaining wall on slope after a forming is placed in heating furnace after heating and is taken out, existed first
Butt-welding elbow is laid flat to press on first molding machine and flattens its right end, making it is in the eccentric elbow of eccentric shape, eccentric
The open height of the height of elbow left end is constant, and the open height of right end is slightly less than the height at the osculum end of final eccentric reducing elbow
Degree, in order to finally shape compacting, the specific steps are as follows:
Butt-welding elbow is put into the first molding machine first and is pressed and molded, wherein the first molding machine includes first hydraulic
Machine (101) is provided with the first upper mold (102) arranged up and down and the first lower die (103) on the first hydraulic press (101), wherein
First lower die (103) is plane mould, and the first upper mold (102) is inclined-plane mould, and the left end height of inclined-plane mould is greater than right end height, first
It is provided with vertical positioning plate (104) between left section and left section of the first lower die (103) of upper mold (102), positioning plate (104) is used
The positioning of the stub end of eccentric reducer when the first molding machine is molded, butt-welding elbow is by the first molding machine
Compression molding becomes eccentric elbow；
1.2, molding eccentric elbow is put into the second molding machine and is pressed and molded again, is pressed and molded as required ruler
Very little eccentric reducing elbow, the specific steps are as follows:
Eccentric elbow is put into the second molding machine and is pressed and molded, wherein the second molding machine includes the second hydraulic press
(201), the second upper mold (202) arranged up and down and the second lower die (203) are provided on the second hydraulic press, wherein the second lower die
It (203) is cavity plate, the shape on the convex surface of the shape and eccentric reducing elbow of cavity plate is mutually coincide, and the second upper mold (202) is punch-pin,
The shape of the concave surface of the shape and eccentric reducing elbow of punch-pin is mutually coincide, and second molding machine further includes having a core model
(204), the shape of the core model (204) and the hollow internal structure of eccentric reducing elbow are mutually coincide；
First by 90 degree of eccentric rotating elbow, core model (204) then are packed into inside it, then allow eccentric elbow into second
In lower die (203), start the second molding machine, the second upper mold (202) pushes, and the reducing side pressure deformed is made required
Diameter, so that eccentric elbow compression molding is eccentric reducing elbow, the eccentric reducing elbow after the completion of final compacting reaches
It is required that bending radius and outer diameter, eccentric reducing elbow forming after must heat treatment, and to its both ends carry out welding groove machine add
Work completes Chief manufacturing process；
Step 2: the stub end in eccentric reducing elbow (2) welds first pipe (1)；
Step 3: the stub end in eccentric reducing elbow (2) welds second pipe (3).
4. a kind of butt welding eccentric reducing elbow used in industrial pipeline turning according to claim 3, it is characterised in that
Above-mentioned step two and step 3 sequence are exchanged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910518337.4A CN110260077B (en) | 2019-06-15 | 2019-06-15 | Butt welding eccentric reducing elbow for industrial pipeline turning part and production process thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910518337.4A CN110260077B (en) | 2019-06-15 | 2019-06-15 | Butt welding eccentric reducing elbow for industrial pipeline turning part and production process thereof |
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| CN110260077B CN110260077B (en) | 2024-06-21 |
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| CN103286252A (en) * | 2012-02-27 | 2013-09-11 | 辽阳石化机械设计制造有限公司 | Compacting die for reducing elbow and forming method of reducing elbow |
| KR20140045038A (en) * | 2012-10-08 | 2014-04-16 | (주)유창산공 | Elbow manufacture device |
| CN103604014A (en) * | 2013-11-14 | 2014-02-26 | 上海沈达空调配件厂（普通合伙） | Reducing pipe fitting and manufacturing method thereof |
| CN206159718U (en) * | 2016-10-26 | 2017-05-10 | 扬州赛尔达尼龙制造有限公司 | Eccentric elbow |
| CN210566912U (en) * | 2019-06-15 | 2020-05-19 | 江阴市南方管件制造有限公司 | Butt welding eccentric reducing elbow used at industrial pipeline turning position and production device thereof |
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| CN110260077B (en) | 2024-06-21 |
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