CN110645429A - Expansion loose joint - Google Patents

Expansion loose joint Download PDF

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Publication number
CN110645429A
CN110645429A CN201911033701.4A CN201911033701A CN110645429A CN 110645429 A CN110645429 A CN 110645429A CN 201911033701 A CN201911033701 A CN 201911033701A CN 110645429 A CN110645429 A CN 110645429A
Authority
CN
China
Prior art keywords
joint
pipe
expansion
pipeline
telescopic
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
Application number
CN201911033701.4A
Other languages
Chinese (zh)
Inventor
尹俊
李建勇
姚澜
朱怡宁
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanjing Shangwei Rail Technology Co Ltd
Anhui Xin Kagetaka Rail Vehicle Equipment Co Ltd
Original Assignee
Nanjing Shangwei Rail Technology Co Ltd
Anhui Xin Kagetaka Rail Vehicle Equipment Co Ltd
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 Nanjing Shangwei Rail Technology Co Ltd, Anhui Xin Kagetaka Rail Vehicle Equipment Co Ltd filed Critical Nanjing Shangwei Rail Technology Co Ltd
Priority to CN201911033701.4A priority Critical patent/CN110645429A/en
Publication of CN110645429A publication Critical patent/CN110645429A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • F16L27/00—Adjustable joints, Joints allowing movement
    • F16L27/12—Adjustable joints, Joints allowing movement allowing substantial longitudinal adjustment or movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61C—LOCOMOTIVES; MOTOR RAILCARS
    • B61C17/00—Arrangement or disposition of parts; Details or accessories not otherwise provided for; Use of control gear and control systems
    • 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
    • F16L19/02—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
    • F16L19/0212—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member using specially adapted sealing means
    • F16L19/0218—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member using specially adapted sealing means comprising only sealing rings
    • 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
    • F16L19/02—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
    • F16L19/025—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member the pipe ends having integral collars or flanges
    • 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
    • F16L51/00—Expansion-compensation arrangements for pipe-lines
    • F16L51/02—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube
    • F16L51/025—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube with several corrugations
    • 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
    • F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Transportation (AREA)
  • Joints Allowing Movement (AREA)

Abstract

An expansion loose joint is used for connecting pipelines in a train and absorbing the deformation of the pipelines caused by thermal expansion and cold contraction. The invention comprises inner toothed pipe joints for connecting pipelines and telescopic connecting pieces arranged between the inner toothed pipe joints. The telescopic connecting piece responds to the influence of thermal expansion and cold contraction of the pipeline on the pipeline structure, and the corresponding contraction is used for absorbing the expansion amount of the pipeline or corresponding stretching is used for ensuring the stability of pipeline connection. Therefore, the stress acting on the movable joint due to the deformation of the original pipeline can be absorbed, the pipeline and the movable joint are not influenced by the deformation and the expansion amount, the pipeline and the movable joint are not deformed or loosened in the train running process, and the medium in the train pipeline is not leaked to influence the train running.

Description

Expansion loose joint
Technical Field
The invention relates to the field of train parts, in particular to an expansion loose joint.
Background
The pipeline on the train expands when heated and contracts when cooled. Because the train has a large running distance span and the temperature difference of the running environment of the train is obvious in the running process, the deformation of the pipeline is large in the running process. For a stainless steel pipe with the length of 1m, the expansion and contraction amount of the stainless steel pipe is usually 0.35-0.38 mm in the running process of a train. Every steel pipe length sets up to 6m in the train, and the expend with heat and contract with cold flexible volume between the whole car steel pipe just can reach 5 ~ 8 millimeters.
Because the pipeline on the train does not have stress absorbing structure or can hold the space of deformation itself, the flexible volume of whole car 5 ~ 8 millimeters can only release on the loose joint that connects between the pipeline. The movable joint needs to bear the vibration of a train in the running process of the train and also needs to receive the stretching or the compression of the expansion with heat and the contraction with cold of a train pipeline, so that the movable joint is easy to deform or loosen, a medium in the pipeline is leaked, and the running of the train is influenced.
Therefore, a structure capable of absorbing the amount of deformation caused by thermal expansion and contraction of the train pipeline is needed.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the expansion loose joint, which realizes the relief of the deformation stress of the train pipeline through the telescopic connecting piece, protects the pipeline and the loose joint from the stress influence caused by the environment and protects the train pipeline. The invention specifically adopts the following technical scheme.
First, in order to achieve the above object, there is provided an expansion joint, comprising: the inner pipe joints are respectively arranged at the end parts of the two ends of the expansion loose joint; the telescopic connecting piece is arranged in the middle of the expansion loose joint and positioned between the inner pipe joints; one end of the telescopic connecting piece is connected to the inner tooth pipe joint, and the other end of the telescopic connecting piece is connected to the other inner tooth pipe joint.
Optionally, in the expansion loose joint, the telescopic connecting member is a metal corrugated pipe.
Optionally, in the expansion joint, a pipe wall of the metal corrugated pipe is a single layer or a double layer.
Optionally, in the expansion loose joint, an end of each of the inner adapters includes an inner adapter inner connection pipe, and the inner adapter inner connection pipe is connected to a pipe wall of the metal corrugated pipe in a sealing manner; the expansion loose joint is further connected with a connecting transition joint, the connecting transition joint is provided with an outer periphery and an inner periphery, and the inner periphery of the connecting transition joint is fixedly connected with the end part of the inner connecting pipe of the inner dental pipe connector.
Optionally, in the expansion loose joint, the inner pipe joint further includes an inner pipe joint external connector disposed outside an end of the expansion loose joint; the inner wall of the external connector of the inner thread pipe joint is provided with threads.
Optionally, the expansion joint further comprises a sheath, and ends of the sheath are fixedly connected to the outer periphery of each of the connection transition joints.
Optionally, in the expansion loose joint, the sheath is a metal braided sleeve, an end of the metal braided sleeve is welded to an outer periphery of the connection transition joint, and the outer peripheries of the metal braided sleeve and the connection transition joint surround the outside of the telescopic connector.
Optionally, in the above expansion loose joint, the metal knitted jacket and/or the telescopic connecting piece is made of a stainless steel material, and a surface of the metal knitted jacket has a pore.
Optionally, in the above expansion loose joint, the metal braided sleeve and the telescopic connecting piece are stretched or contracted synchronously to absorb the telescopic stress of the pipeline connected to the internal pipe joint.
Optionally, in the expansion loose joint, the outer side of the metal knitted jacket is further wrapped with a rubber protective sleeve.
Advantageous effects
The invention is connected between pipelines in a train and absorbs the deformation of the pipelines caused by thermal expansion and cold contraction. The invention comprises inner toothed pipe joints for connecting pipelines and telescopic connecting pieces arranged between the inner toothed pipe joints. The telescopic connecting piece responds to the influence of thermal expansion and cold contraction of the pipeline on the structural size of the pipeline, and the corresponding contraction is used for absorbing the expansion amount of the pipeline or corresponding stretching is used for ensuring the stable connection of the pipeline. Therefore, the stress acting on the movable joint due to the deformation of the original pipeline can be absorbed, the pipeline and the movable joint are not influenced by the deformation and the expansion amount, the pipeline and the movable joint are not deformed or loosened in the train running process, and the medium in the train pipeline is not leaked to influence the train running.
In order to ensure the requirement of pressure bearing in the pipeline, the invention can further set the telescopic connecting piece into a double-layer stainless steel corrugated pipe. The stainless steel corrugated pipe has thin pipe wall, so that the stainless steel corrugated pipe can be protected by the sheath formed by the metal braided sleeve. The metal weaving sleeve is provided with holes, and the metal wires between the holes can absorb the telescopic stress synchronously along with the stretching or compressing of the corrugated pipe, so that the corrugated pipe inside the metal weaving sleeve is effectively protected, and the collision or impact of external foreign matters is avoided.
The pores of the metal woven sleeve can be used for rainwater and various gases in the environment to pass through, so that the phenomenon that the rainwater and various gases are accumulated on the wall of the corrugated pipe to corrode the pipe body is avoided. In order to further provide a sealing effect on media in the expansion loose joint when the corrugated pipe is loosened and leaked temporarily, the rubber protective sleeve can be wrapped on the outer side of the metal braided sleeve, and the rubber protective sleeve serves as a pipeline for medium circulation temporarily, so that the forced stop of a train due to pipeline failure is avoided.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of the overall construction of the expansion joint of the present invention;
FIG. 2 is a schematic view of a portion of the expansion joint of FIG. 1 in connection with a pipeline of a train;
FIG. 3 is a perspective view of one implementation of the expansion joint of the present invention.
In the drawings, 1 denotes an external pipe joint; 11 denotes a pipe; 2 denotes an internal thread joint; 21 denotes an inner nipple; 22 denotes an internal nipple external connection head; 3 denotes a telescopic link; 4 denotes a connecting transition joint; 41 represents the inner perimeter of the connecting transition piece; 42 represents the outer perimeter of the connecting transition joint; 5 denotes a sheath; 6 denotes a bolt; 61 denotes a screw thread; and 62 denotes a gasket.
Detailed Description
In order to make the purpose and technical solution of the embodiments of the present invention clearer, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The meaning of "and/or" in the present invention means that the respective single or both of them exist individually or in combination.
The meaning of the 'inner and outer' in the invention means that relative to the expansion loose joint per se, the direction pointing to the inside of the telescopic connecting piece is inner, and the direction pointing to the outside of the sheath is outer; and not as a specific limitation on the mechanism of the device of the present invention.
The term "connected" as used herein may mean either a direct connection between the components or an indirect connection between the components via other components.
Fig. 1 shows an expansion loose joint according to the invention, which is arranged in a pipeline of a train, and an outer pipe joint 1 at the end of the pipeline of the train is connected by two inner pipe joints 2 and is communicated with a pipeline 11 of the train. It connects telescopic connection 3 between two interior screwed pipe joints 2, responds the influence of pipeline expend with heat and contract with cold to pipeline structure size by telescopic connection 3, corresponding promotion shrink when the pipeline is heated the expansion of telescopic connection 3 with the inflation volume of absorption pipeline, or pipeline meet corresponding tensile when cold shrink telescopic connection 3 and guarantee that the pipe connection is stable.
In a more specific implementation mode, the telescopic connecting piece is arranged in the middle of the expansion loose joint and is positioned between the internal tooth pipe joints; one end of the telescopic connecting piece is connected to the inner tooth pipe joint, and the other end of the telescopic connecting piece is connected to the other inner tooth pipe joint. The expansion joint may comprise the expansion joint shown in fig. 3:
an inner pipe joint 2 which is arranged at the end part of the expansion loose joint and is connected with an outer pipe joint 1 arranged at the end part of a train pipeline in a mode shown in figure 2, wherein the inner pipe joint can be provided with threads for connecting the pipeline, and the threads are arranged inside the inner pipe joint pipeline; the inner dental pipe joints are connected with each other:
a connection transition joint 4, which is connected with the inner dental pipe joint 2 in a sealing way and has an inner periphery and an outer periphery; in one implementation, referring to the partial cross-sectional view of the expanded loose joint end in fig. 1, the inner circumference of the connecting transition joint 4 is closer to the internal thread joint 2, the outer circumference of the connecting transition joint 4 is longer than the inner circumference, and the inner circumference and the outer circumference are welded as a whole with the internal thread joint 2 at a position close to the end of the internal thread joint internal connection pipe 21 of the internal thread joint 2 in fig. 2; the other end of the internal thread pipe joint is an external connector 22 of the internal thread pipe joint; a gap is reserved between the inner ring and the outer ring of the connecting transition joint 4, and the side wall of the telescopic connecting piece 3 can be accommodated;
the end parts of the telescopic connecting pieces 3 are respectively connected with the inner peripheries of the connecting transition joints 4 in a sealing way, and pipelines for medium circulation are formed by the communication among the telescopic connecting pieces 3, the inner peripheries of the connecting transition joints 4, the inner dental tube joint inner connecting tubes 21 and the pipelines 11; the telescopic connecting piece 3 can be correspondingly contracted to absorb the expansion amount of the pipeline or correspondingly stretched to ensure the stable connection of the pipeline in the process that the pipeline 11 is heated to expand or is cooled to contract;
and the end part of the sheath 5 is fixedly connected with the periphery of each connecting transition joint 4 respectively and surrounds the telescopic connecting piece 3, so that the telescopic connecting piece 3 is protected from collision or impact of external foreign matters.
In some implementations, in the above expansion joint, the telescopic connection member 3 may be a corrugated pipe made of stainless steel or other metal materials. The pipeline pressure-bearing device can be arranged into a single layer or double layers or even multiple layers according to the pipeline pressure-bearing requirement so as to bear the pressure of 40kpa in the pipeline or correspond to the pipe pressure of at least 60 kilograms. The end part of the pipe wall of the stainless steel corrugated pipe can be welded on the inner periphery of the connecting transition joint 4 in a high-frequency oscillation welding mode and is communicated with the inner wall of the inner screwed pipe connector 2, so that the outer screwed pipe connector 1 connected with the inner screwed pipe connector is communicated to a pipeline 11 of a train.
Referring to fig. 2, a gasket 62 may further abut between the inner pipe joint and the outer pipe joint to seal a connection port of the inner pipe joint and the outer pipe joint, and the periphery of the gasket may be screwed and fixed by a thread 61 inside the bolt 6 and communicated to a pipeline.
In a more preferred implementation manner, in the expansion joint, the sheath 5 may be a metal braided sheath made of 304 stainless steel or the like, and an end of the metal braided sheath is welded to an outer periphery of the connecting transition joint 4. Specifically, the outer wall of the end of the metal braided sleeve is welded to the inner wall of the periphery of the connecting transition joint 4, and the connecting transition joint 4 integrally seals the ports of the sheath 5 and the telescopic connector 3, so that the ports are protected from being peeled off or disconnected by external force. Therefore, the metal braided sleeve and the periphery of the connecting transition joint 4 surround the outer side of the telescopic connecting piece 3, so that the telescopic connecting pieces 3 such as the corrugated pipe and the like are protected, the direct contact with external corrosive gas or liquid is avoided, and the influence of the perforation of the pipe wall on the sealing of the medium in the pipeline is avoided.
For guaranteeing the protection effect to pipeline and bellows structure, the metal is woven the cover and is woven by stainless steel's wire and form, and the mode of weaving makes the surface of metal is woven the cover has the hole, and the wire near the hole can relative movement, provides certain flexible deformation volume. Therefore, in the running process of the train, the metal woven sleeve can be synchronously stretched or contracted by the pipeline or the pipe joint along with the telescopic connecting piece 3, the telescopic stress of the pipeline connected with the inner screwed pipe joint 2 is absorbed, the stress is prevented from directly acting on the pipe joints such as the inner screwed pipe joint or the outer screwed pipe joint, and the gasket and the thread structure in the pipe joints are pulled or compressed, so that the pipe joints are deformed and loosened.
Under other implementation modes, for further temporarily providing a sealing effect on a medium in the pipe when the corrugated pipe in the expansion loose joint is loosened and leaked, the rubber protective sleeve can be wrapped on the outer side of the metal braided sleeve, and the rubber protective sleeve is temporarily used as a pipeline for medium circulation, so that the forced stop of the train due to the failure of the pipeline is avoided. The rubber protective sleeve can further prevent external hard objects from striking the expansion loose joint structure, buffer frequent vibration in vehicle operation and eliminate fatigue of internal mechanical structures.
Therefore, the invention can provide the deformation amount for the expansion of the pipeline through the expansion connecting piece formed by the corrugated pipe, and solves the problem that the expansion size of the pipe joint in the pipeline is small and the pipe joint is easy to be pulled, deformed and loosened by the expansion of the pipeline. According to the expansion loose joint, the length of the corrugated pipe is set to be 15-20 cm correspondingly according to the deformation amount required by the length of the pipeline, so that sufficient expansion and contraction allowance is provided, the pipeline and the loose joint in the pipeline cannot stretch and deform, and the condition that the operation of a train is influenced by the leakage of a pipeline medium is effectively avoided.
The above are merely embodiments of the present invention, which are described in detail and with particularity, and therefore should not be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the spirit of the present invention, and these changes and modifications are within the scope of the present invention.

Claims (10)

1. An expansion joint, comprising:
the inner pipe joints (2) are respectively arranged at the end parts of the two ends of the expansion loose joint; the telescopic connecting piece (3) is arranged in the middle of the expansion loose joint and is positioned between the inner pipe joints (2);
one end of the telescopic connecting piece (3) is connected to the inner pipe connector (2), and the other end of the telescopic connecting piece is connected to the other inner pipe connector (2).
2. Expansion joint according to claim 1, characterized in that the telescopic connection (3) is a metal bellows.
3. The expansion joint according to claim 2, wherein the wall of the metal bellows is single-layered or double-layered.
4. Expansion joint according to claims 1-3, characterized in that the end of each of said female adapters (2) comprises a female adapter internal connection pipe (21), said female adapter internal connection pipe (21) being sealingly connected to the wall of said metal bellows;
the expansion loose joint is further connected with a connecting transition joint (4), the connecting transition joint (4) is provided with an outer periphery and an inner periphery, and the inner periphery of the connecting transition joint (4) is fixedly connected with the end part of the inner tooth pipe connector inner connecting pipe (21).
5. Expansion joint according to claims 1-4, characterized in that the inner pipe joint (2) further comprises an inner pipe joint external connection (22) arranged outside the end of the expansion joint; the inner wall of the external connector (22) of the inner thread pipe joint is provided with threads.
6. Expansion joint according to claims 1-4, further comprising a sheath (5) having its ends fixedly connected to the outer circumference of each of said connection transition joints (4), respectively.
7. Expansion joint according to claim 6, characterized in that the sheath (5) is a metal woven sleeve, the ends of which are welded to the outer circumference of the connection transition piece (4), the metal woven sleeve and the outer circumference of the connection transition piece (4) enclosing the outside of the telescopic connection (3).
8. Expansion joint according to claim 7, characterized in that the metal braid and/or the telescopic connector (3) is of stainless steel material, the surface of the metal braid being provided with pores.
9. Expansion joint according to claim 7, characterized in that said metal knitted jacket and said telescopic connector (3) are stretched or contracted simultaneously, absorbing the telescopic stress of the pipe to which the female pipe joint (2) is connected.
10. The expansion joint as claimed in claim 9, wherein the metal braided sleeve is further covered with a rubber protective sleeve.
CN201911033701.4A 2019-10-28 2019-10-28 Expansion loose joint Pending CN110645429A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911033701.4A CN110645429A (en) 2019-10-28 2019-10-28 Expansion loose joint

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911033701.4A CN110645429A (en) 2019-10-28 2019-10-28 Expansion loose joint

Publications (1)

Publication Number Publication Date
CN110645429A true CN110645429A (en) 2020-01-03

Family

ID=69013667

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911033701.4A Pending CN110645429A (en) 2019-10-28 2019-10-28 Expansion loose joint

Country Status (1)

Country Link
CN (1) CN110645429A (en)

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