CN107489832A - A kind of tensile force type pipe joint and connection method and purposes - Google Patents
A kind of tensile force type pipe joint and connection method and purposes Download PDFInfo
- Publication number
- CN107489832A CN107489832A CN201710708293.2A CN201710708293A CN107489832A CN 107489832 A CN107489832 A CN 107489832A CN 201710708293 A CN201710708293 A CN 201710708293A CN 107489832 A CN107489832 A CN 107489832A
- Authority
- CN
- China
- Prior art keywords
- nut
- hole
- connecting leg
- pipe joint
- fittings body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- 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
- F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
- F16L19/06—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts in which radial clamping is obtained by wedging action on non-deformed pipe ends
- F16L19/065—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts in which radial clamping is obtained by wedging action on non-deformed pipe ends the wedging action being effected by means of a ring
-
- 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
- F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
- F16L19/06—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts in which radial clamping is obtained by wedging action on non-deformed pipe ends
- F16L19/07—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts in which radial clamping is obtained by wedging action on non-deformed pipe ends adapted for use in socket or sleeve connections
Abstract
The present invention provides a kind of tensile force type pipe joint and connection method and purposes, and the tensile force type pipe joint includes fittings body, nut, sealing ring and pulling sleeve, and its simple in construction, good airproof performance, anti-pull-out force are high.Suitable for the Large Diameter Pipeline sheet-metal duct that outer tube diameter is 145 225mm, wall thickness is 1.5 2.5mm, welding, without flange；Employ pulling sleeve, the front end of pulling sleeve is with a circle seam, pulling sleeve is being connected the incision of outer diameter tube by the displacement of taper lock tieholen under the conditions of the inner cone of nut to complete pulling force loop port, to prevent the pull-off by connecting leg road of pipe joint, forms the sealing pipeline of medium conveying.
Description
Technical field
The present invention relates to a kind of pipe joint and connection method and purposes, and in particular to a kind of tensile force type pipe joint and connection side
Method and purposes, it is mainly arranged in the pipeline of conveying air, as the pipeline can connect with air compressor.
Background technology
Pipe joint is the fastening means between pipeline and pipeline, is the tie point that can be dismounted between element and pipeline.
Indispensable key player is act as in pipe fitting, it is one of two main composition parts of hydraulic pipeline.Pipe joint has
Various species, conventional pipe joint can be generally divided into two kinds of hard pipe joint and hose coupling.If according to pipe joint and pipe
The connected mode in road is divided, and hard pipe joint has three kinds of flared type, bite type and welded type, and hose coupling is mainly then attaching type glue
Pipe joint.
Publication date is on December 8th, 2015, Publication No. CN204879137U Chinese patent, discloses a kind of antiseep
Anticorrosive bimetallic transition pipe joint, belong to pipeline welding interconnection technique field.A kind of anticorrosive bimetallic transition conduit of antiseep
Joint, it is tubular structure, it is characterised in that in aluminium, aluminium alloy, titanium or titanium alloy including internal transition zone and outer wrap
Any noncorroding metal layer (40), axis direction of the transition zone along pipe be followed successively by aluminium-titanium-steel, aluminium alloy-titanium-steel,
Titanium-titanium-steel or the cyclic structure superimposion of titanium alloy-titanium-steel material form.The utility model is multiple using explosive welding processing
The technology of condensation material, make it have airtightness features, and be processed as meeting by different monometallic flat board metallurgical welds together
The transitional connection pipe joint design of requirement of engineering.The utility model effectively prevents weld interface ripple whirlpool cavity seepage to ask
Topic, improve the reliability of transition pipe joint high sealing characteristic；The germinating of face crack is effectively prevented, improves fatigability
Energy and low-temperature impact resistance；Improve the durability of transit joint；The counterbore of monometallic pipe insertion welding is devised in structure,
Have the function that fixed pipe fitting position, be easy to welding procedure.After transit joint welded and installed, it is not necessary to regular maintenance.The pipe connects
Head firmly installs, but installs complexity and can not realize dismounting.
It is existing that external diameter can only be accomplished using incision sealing and the caliber of the pipeline of pulling force sealing structure, current maximum
50mm, more than 50mm, the connection of generally use flange or welding, complicated, installation is complicated, operation inconvenience, using inadequate
Flexibly.In the case where wall is thin, if caliber is big, in incision sealing and pulling force sealing, when being also not cut into outer wall, tube wall is just
It has been deformed that, sealing effectiveness can not be realized.
The content of the invention
It is an object of the invention to overcome above shortcomings in the prior art, and provide a kind of reasonable in design
Tensile force type pipe joint and connection method and purposes, its simple in construction, good airproof performance, anti-pull-out force are high.
Technical scheme is used by the present invention solves the above problems：A kind of tensile force type pipe joint, including fittings body, it is described
The both ends outer wall of fittings body is provided with external screw thread, and the fittings body is provided at both ends with fittings body through hole, it is characterised in that：Also include
Nut, sealing ring and pulling sleeve；The fittings body through hole is connected with No.1 cylindrical hole, and the aperture of the No.1 cylindrical hole is big
In fittings body through hole；A circle projection is formed on the middle hole wall of the fittings body through hole；The fittings body is provided with turret head；Institute
State nut and be provided with nut through hole, internal thread part that the nut through hole includes being sequentially connected, No. two cylindrical holes, cone lockings
Hole；The internal thread part of the nut is provided with internal thread；The aperture of No. two cylindrical holes is more than the aperture of internal thread part, institute
The maximum diameter of hole for stating taper lock tieholen is less than the aperture of No. two cylindrical holes, between the taper lock tieholen and No. two cylindrical holes
Form a circle boss；The aperture of the taper lock tieholen No. two cylindrical connection ends since with tapering into and by connecting leg
The aperture in road is equal；The nut is provided with turret head；The sealing ring and pulling sleeve be sequentially distributed in one end of fittings body and
Between nut, sealing ring is arranged in No.1 cylindrical hole；The front end of the pulling sleeve is provided with a circle seam, the pulling sleeve
Rear end set it is fluted, groove and the fittings body clamping by sealing ring fix No.1 cylindrical hole in；The fittings body and
Nut is connected through a screw thread, and the seam of the pulling sleeve is located at nut and by between the tube wall in connecting leg road, seam and cone locking
The hole wall contact in hole, and curve inwardly and compressed by connecting leg road so as to being carried out by connecting leg road under the hole wall effect of taper lock tieholen
It is fixed.
Preferably, nut of the present invention is locking nut.
Preferably, sealing ring of the present invention is single sealing ring or Double seal ring.
Preferably, the front end of the seam of the present invention is acute angle shape.
Preferably, between angular range is 10 ° -30 ° between two buses in cone locking hole axle section of the present invention.
Preferably, the pore diameter range of fittings body through hole of the present invention is 6-200mm.
Preferably, the aperture of fittings body through hole of the present invention and the minimum-value aperture of taper lock tieholen are equal.
Preferably, the external diameter of the present invention by connecting leg road is 145-225mm, wall thickness 1.5-2.5mm.
A kind of the characteristics of connection method of tensile force type pipe joint, is：Use described tensile force type pipe joint, the connection
The step of method, is as follows：It is 145-225mm, wall thickness 1.5-2.5mm by the external diameter in connecting leg road, by the external diameter and wall thickness in connecting leg road
The ratio between reach 100:1, nut through hole, pulling sleeve, sealing ring and fittings body are passed through by connecting leg road, both sides are first placed in by connecting leg road
At the both ends of connector, both without using welding, also connected without using flange, only by turn nut fix sealing ring and
Pulling sleeve；The displacement of the taper lock tieholen of nut, seam curve inwardly compression by connecting leg under the hole wall effect of taper lock tieholen
The outer wall in road, it is indeformable by the inwall in connecting leg road, so as to being fixed and being sealed by connecting leg road, prevent pulling out by connecting leg road
It is de-.
A kind of purposes of tensile force type pipe joint, its feature are：Using described tensile force type pipe joint, due to by connecting leg road
External diameter and the ratio between wall thickness reach 100:1, during to being fixed and being sealed by connecting leg road, by the wall in connecting leg road by
Easily it is deformed to pressure, the ingenious cooperation of the invention by nut and pulling sleeve, only by rotating nut, you can realize
To the function of being fixed and sealed by the outer wall in connecting leg road, can ensure that it is indeformable by the inwall in connecting leg road, without welding and
In the case of being connected without using flange, it is possible to realize being fixed and being sealed by connecting leg road to Large Diameter Pipeline and thin pipe wall
Effect, to those skilled in the art, reality pipeline connection on there is breakthrough meaning, be advantageous to Large Diameter Pipeline with
The pipeline connection of thin pipe wall is more convenient and flexible.
The present invention compared with prior art, has advantages below and effect：It is 145-225mm, wall thickness suitable for outer tube diameter
For 1.5-2.5mm Large Diameter Pipeline sheet-metal duct, welding, without flange；Pulling sleeve is employed, the front end of pulling sleeve is with a circle
Seam, pulling sleeve complete pulling force loop port outside by connecting leg road under the conditions of the inner cone of nut by the displacement of taper lock tieholen
The incision in footpath, to prevent the pull-off by connecting leg road of pipe joint, the sealing pipeline of medium conveying is formed, its simple in construction, sealing
Reliably, anti-pull-out force is high, widely applicable.O-ring seals are formula of filling a vacancy, and can play reliable sealing function, the tolerance of O-ring seals
The reliability of O-ring seals is not influenceed；Incision set is that resistance to plucking takes off part, prevents pipeline pull-off.And 45 degree of angles of the invention turn half tooth
Incision can be achieved.
Brief description of the drawings
Fig. 1 is the structural representation of the embodiment of the present invention.
Fig. 2 is the cross section structure diagram of fittings body of the embodiment of the present invention.
Fig. 3 is the side structure schematic view of fittings body of the embodiment of the present invention.
Fig. 4 is the cross section structure diagram of nut of the embodiment of the present invention.
Fig. 5 is the side structure schematic view of nut of the embodiment of the present invention.
Fig. 6 is the cross section structure diagram of pulling sleeve of the embodiment of the present invention.
Fig. 7 is the side structure schematic view of pulling sleeve of the embodiment of the present invention.
Fig. 8 is the cross section structure diagram of list sealing ring of the embodiment of the present invention.
Fig. 9 is the side structure schematic view of list sealing ring of the embodiment of the present invention.
Figure 10 is the cross section structure diagram of Double seal ring of the embodiment of the present invention.
Figure 11 is the side structure schematic view of Double seal ring of the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawings and the present invention is described in further detail by embodiment, and following examples are to this hair
Bright explanation and the invention is not limited in following examples.
Embodiment.
Referring to Fig. 1 to Figure 11, the tensile force type pipe joint in the present embodiment includes fittings body 1, nut 4, sealing ring 2 and pulling force
Set 3.
The both ends outer wall of the present embodiment center tap body 1 is provided with external screw thread 12, and the both ends of the fittings body 1 are additionally provided with and connect
Head body through hole 6.Fittings body through hole 6 is connected with No.1 cylindrical hole 7, and the aperture of the No.1 cylindrical hole 7 leads to more than fittings body
Hole 6.Turret head 9 is provided with fittings body 1 and nut 4, for spanner erection joint body 1, nut 4 and pipeline 5.Fittings body leads to
A circle projection 17 is formed on the middle hole wall in hole 6, projection 17 plays a part of targeted duct 5.
Nut 4 in the present embodiment is locking nut.Nut 4 is provided with nut through hole, and nut through hole includes being sequentially connected
Internal thread part 14, No. two cylindrical holes 15, taper lock tieholens 8.Internal thread 13 is provided with internal thread part 14.No. two cylinders
The aperture in hole 15 is more than the aperture of internal thread part 14, and the maximum diameter of hole of taper lock tieholen 8 is less than the aperture of No. two cylindrical holes 15,
A circle boss 16 is formed between taper lock tieholen 8 and No. two cylindrical holes 15.The aperture of taper lock tieholen 8 from No. two cylinders
The connection end in hole 15 starts to taper into equal with by the aperture in connecting leg road 5.It is 145-225mm by the external diameter in connecting leg road 5, wall
Thickness is 1.5-2.5mm, and wall thickness accepted value is 2mm.
Sealing ring 2 and pulling sleeve 3 in the present embodiment are sequentially distributed between one end of fittings body 1 and nut 4, sealing ring
2 can be that single sealing ring can also be Double seal ring.Sealing ring 2 is arranged in No.1 cylindrical hole 7.The front end of pulling sleeve 3 is set
A circle seam 10 is equipped with, the front end of seam 10 is acute angle shape.The rear end setting fluted 11 of pulling sleeve 3, groove 11 and fittings body 1
Clamping fixes sealing ring 2 in No.1 cylindrical hole 7.Fittings body 1 and nut 4 are connected through a screw thread, the seam of the pulling sleeve 3
10 in nut 4 and by between the tube wall in connecting leg road 5, and seam 10 contacts with the hole wall of taper lock tieholen 8, and in taper lock tieholen 8
Hole wall effect under curve inwardly.
Between angular range is 10 ° -30 ° between taper lock tieholen 8 shaft section, two buses in the present embodiment.Fittings body
The aperture of through hole 6 and the minimum-value aperture of taper lock tieholen 8 are equal.
A kind of connection method of tensile force type pipe joint, step are as follows：By connecting leg road 5 through nut through hole, pulling sleeve 3, close
Seal 2, fittings body 1, both sides are first fixed on the both ends of connector 1 by connecting leg road 5, then turn nut 4, fix sealing ring 2
With pulling sleeve 3；With the displacement of the taper lock tieholen 8 of nut 4, seam 10 is inwardly curved under the hole wall effect of taper lock tieholen 8
Song is compressed by connecting leg road so as to being fixed and being sealed by connecting leg road, to prevent the pull-off by connecting leg road of pipe joint.This hair
Bright 45 degree of angles turn half tooth and incision can be achieved.
The purposes of tensile force type pipe joint of the present invention is：Using described tensile force type pipe joint, due to by the outer of connecting leg road
The ratio between footpath and wall thickness reach 100:1, during to being fixed and being sealed by connecting leg road, pressed by the wall in connecting leg road
Power is easily deformed, the ingenious cooperation of the invention by nut and pulling sleeve, only by rotating nut, you can is realized to quilt
The function that the outer wall in connecting leg road is fixed and sealed, can ensure that it is indeformable by the inwall in connecting leg road, without welding and need not
In the case of being connected using flange, it is possible to realize the effect for being fixed and being sealed by connecting leg road to Large Diameter Pipeline and thin pipe wall
Fruit, to those skilled in the art, there is breakthrough meaning in the pipeline connection of reality, be advantageous to Large Diameter Pipeline and thin
The pipeline connection of tube wall is more convenient and flexible.
Furthermore, it is necessary to illustrate, the specific embodiment described in this specification, the shape of its parts and components, it is named
Title etc. can be different, and the above content described in this specification is only to structure example explanation of the present invention.It is all according to
The equivalence changes or simple change done according to the construction described in inventional idea of the present invention, feature and principle, are included in this hair
In the protection domain of bright patent.Those skilled in the art can do various to described specific embodiment
The modification of various kinds or supplement are substituted using similar mode, without departing from structure of the invention or surmount present claims
Scope defined in book, protection scope of the present invention all should be belonged to.
Claims (9)
1. a kind of tensile force type pipe joint, including fittings body, the both ends outer wall of the fittings body is provided with external screw thread, the fittings body
It is provided at both ends with fittings body through hole, it is characterised in that：Also include nut, sealing ring and pulling sleeve；The fittings body through hole connection
There is No.1 cylindrical hole, the aperture of the No.1 cylindrical hole is more than fittings body through hole；The middle hole wall of the fittings body through hole
It is upper to form a circle projection；The fittings body is provided with turret head；The nut is provided with nut through hole, and the nut through hole includes
Internal thread part, No. two cylindrical holes, the taper lock tieholen being sequentially connected；The internal thread part of the nut is provided with internal thread；Institute
The aperture for stating No. two cylindrical holes is more than the aperture of internal thread part, and the maximum diameter of hole of the taper lock tieholen is less than No. two cylinders
The aperture in hole, a circle boss is formed between the taper lock tieholen and No. two cylindrical holes；The aperture of the taper lock tieholen from
Start to taper into No. two cylindrical connection ends and equal by the aperture in connecting leg road；The nut is provided with turret head；
The sealing ring and pulling sleeve are sequentially distributed between one end of fittings body and nut, and sealing ring is arranged on No.1 cylindrical hole
It is interior；The front end of the pulling sleeve is provided with a circle seam, and the rear end of the pulling sleeve sets fluted, the groove and fittings body
Clamping fixes sealing ring in No.1 cylindrical hole；The fittings body and nut are connected through a screw thread, the seam of the pulling sleeve
Positioned at nut and by between the tube wall in connecting leg road, seam contacts with the hole wall of taper lock tieholen, and in the hole wall of taper lock tieholen
The compression that curved inwardly under effect is by connecting leg road so as to being fixed by connecting leg road.
2. tensile force type pipe joint according to claim 1, it is characterised in that：The nut is locking nut.
3. tensile force type pipe joint according to claim 1, it is characterised in that：The sealing ring is single sealing ring or double density
Seal.
4. tensile force type pipe joint according to claim 1, it is characterised in that：The front end of the seam is acute angle shape.
5. tensile force type pipe joint according to claim 1, it is characterised in that：Described two buses in cone locking hole axle section
Between angular range be 10 ° -30 ° between.
6. tensile force type pipe joint according to claim 1, it is characterised in that：The pore diameter range of the fittings body through hole is 6-
200mm；And/or the aperture of the fittings body through hole and the minimum-value aperture of taper lock tieholen it is equal.
7. tensile force type pipe joint according to claim 1, it is characterised in that：The external diameter by connecting leg road is 145-
225mm, wall thickness 1.5-2.5mm.
A kind of 8. connection method of tensile force type pipe joint, it is characterised in that：Use such as claim 1~8 any claim institute
The tensile force type pipe joint stated, it is as follows the step of the connection method：It is 145-225mm, wall thickness 1.5- by the external diameter in connecting leg road
2.5mm, nut through hole, pulling sleeve, sealing ring and fittings body are passed through by connecting leg road, both sides are first placed at connector by connecting leg road
Both ends, both without using welding, also connected without using flange, sealing ring and pulling sleeve fixed only by nut is turned；
The displacement of the taper lock tieholen of nut, seam curve inwardly under the hole wall effect of taper lock tieholen and compressed by the outer of connecting leg road
Wall, it is indeformable by the inwall in connecting leg road, so as to being fixed and being sealed by connecting leg road, prevent by the pull-off in connecting leg road.
A kind of 9. purposes of tensile force type pipe joint, it is characterised in that：Using as described in claim 1~8 any claim
Tensile force type pipe joint, due to reaching 100 by the ratio between the external diameter in connecting leg road and wall thickness:1, when to being fixed and being sealed by connecting leg road
During, it is under pressure by the wall in connecting leg road and is easily deformed, passes through the ingenious cooperation of nut and pulling sleeve, Jin Jintong
Cross rotating nut, you can realize the function to being fixed and being sealed by the outer wall in connecting leg road, can ensure that by the inwall in connecting leg road
It is indeformable, without welding with connect without using flange in the case of, it is possible to realization is connected to Large Diameter Pipeline and thin pipe wall
The effect that pipeline is fixed and sealed, be advantageous to Large Diameter Pipeline connected with the pipeline of thin pipe wall it is more convenient and flexible.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710708293.2A CN107489832A (en) | 2017-08-17 | 2017-08-17 | A kind of tensile force type pipe joint and connection method and purposes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710708293.2A CN107489832A (en) | 2017-08-17 | 2017-08-17 | A kind of tensile force type pipe joint and connection method and purposes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107489832A true CN107489832A (en) | 2017-12-19 |
Family
ID=60645382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710708293.2A Pending CN107489832A (en) | 2017-08-17 | 2017-08-17 | A kind of tensile force type pipe joint and connection method and purposes |
Country Status (1)
| Country | Link |
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| CN (1) | CN107489832A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108246982A (en) * | 2017-12-21 | 2018-07-06 | 安徽中电气有限公司 | A kind of preparation method of slim rich chromium cast iron pipe |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2320873Y (en) * | 1998-03-11 | 1999-05-26 | 江阴市三立特种钢制品有限公司 | Pipe joint |
| CN2660277Y (en) * | 2003-07-08 | 2004-12-01 | 周晓宇 | Pipe connection with axial sliding bush |
| CN203011654U (en) * | 2012-11-29 | 2013-06-19 | 重庆气体压缩机厂有限责任公司 | Clamp used for pressure test of heat exchange tube |
| CN205639937U (en) * | 2016-05-11 | 2016-10-12 | 嘉兴迈思特管件制造有限公司 | High leakproofness joint Assembly |
| CN106015778A (en) * | 2016-07-22 | 2016-10-12 | 陆子万 | Pipe clamping connection device |
| CN207246606U (en) * | 2017-08-17 | 2018-04-17 | 海盐管件制造有限公司 | Tensile force type pipe fitting |
-
2017
- 2017-08-17 CN CN201710708293.2A patent/CN107489832A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2320873Y (en) * | 1998-03-11 | 1999-05-26 | 江阴市三立特种钢制品有限公司 | Pipe joint |
| CN2660277Y (en) * | 2003-07-08 | 2004-12-01 | 周晓宇 | Pipe connection with axial sliding bush |
| CN203011654U (en) * | 2012-11-29 | 2013-06-19 | 重庆气体压缩机厂有限责任公司 | Clamp used for pressure test of heat exchange tube |
| CN205639937U (en) * | 2016-05-11 | 2016-10-12 | 嘉兴迈思特管件制造有限公司 | High leakproofness joint Assembly |
| CN106015778A (en) * | 2016-07-22 | 2016-10-12 | 陆子万 | Pipe clamping connection device |
| CN207246606U (en) * | 2017-08-17 | 2018-04-17 | 海盐管件制造有限公司 | Tensile force type pipe fitting |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108246982A (en) * | 2017-12-21 | 2018-07-06 | 安徽中电气有限公司 | A kind of preparation method of slim rich chromium cast iron pipe |
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