CN110242824A - A kind of carbon fiber pipe - Google Patents
A kind of carbon fiber pipe Download PDFInfo
- Publication number
- CN110242824A CN110242824A CN201910453540.8A CN201910453540A CN110242824A CN 110242824 A CN110242824 A CN 110242824A CN 201910453540 A CN201910453540 A CN 201910453540A CN 110242824 A CN110242824 A CN 110242824A
- Authority
- CN
- China
- Prior art keywords
- carbon fiber
- fiber pipe
- pipe ontology
- ontology
- heterotypic spring
- 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
-
- 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
- F16L57/02—Protection of pipes or objects of similar shape against external or internal damage or wear against cracking or buckling
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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
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/06—Protection of pipes or objects of similar shape against external or internal damage or wear against wear
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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
- F16L9/00—Rigid pipes
- F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Inorganic Fibers (AREA)
Abstract
The invention belongs to carbon fibre material technical field, specifically a kind of carbon fiber pipe；Including carbon fiber pipe ontology；One layer of anti-electric layer is coated on the outside of the carbon fiber pipe ontology；The inside of the carbon fiber pipe ontology is embedded with one group of heterotypic spring, heterotypic spring is placed on the inside of carbon fiber pipe ontology vertically, heterotypic spring is greater than its internal diameter far from carbon fiber pipe ontology one end close to the internal diameter of carbon fiber pipe body end, and carbon fiber pipe ontology is generated opposition by heterotypic spring compression when vertical force；The present invention is by being embedded in one group of heterotypic spring in carbon fiber pipe ontology, when encountering vertical force to the extruding of carbon fiber pipe ontology, heterotypic spring compression can generate the vertical extruding force that corresponding counterforce counteraction part carbon fiber pipe ontology is subject to, so as to slow down the speed of carbon fiber pipe ontology breakage, if the vertical extruding force that carbon fiber pipe ontology is subject to is too small, heterotypic spring then can all offset it, to improve the service life of carbon fiber pipe ontology.
Description
Technical field
The invention belongs to carbon fibre material technical field, specifically a kind of carbon fiber pipe.
Background technique
Carbon fiber pipe is also known as carbon fibre pipe, also referred to as carbon pipe, carbon fibre tube, is using carbon fibre composite pre-immersion benzene second
Dilute heated solidification pultrusion (twine and scratch) of base alkyd resin forms.During processed, it can be produced by different molds various
Profile, such as: the carbon fiber round tube of different size, the square tube of different size, the sheet material of different size and other profiles: making
Also it can wrap 3K during making and carry out surfactant package beautification etc.；Carbon fiber pipe has intensity height, service life length, corrosion-resistant, quality
Gently, the advantages that low-density, it is widely used in kite, aerial model airplane, lamp bracket, PC equipment rotating shaft, etching machine, Medical treatment device
The mechanical equipments such as tool, sports equipment；One system such as dimensionally stable, conduction, thermally conductive, thermal expansion coefficient is small, self-lubricating and energy-absorbing antidetonation
Column excellent properties.And there is Gao Bimo, endurance, creep resistant, high temperature resistant, corrosion-resistant, wear-resistant etc..
Although carbon fiber pipe have the characteristics that it is many excellent, such as when excessive by transverse pressure, still resilient,
But if the vertical pressure that is subject to of carbon fiber pipe is excessive, it is damaged to directly result in carbon fiber pipe deformation, influences carbon fiber pipe
Normal use, it is therefore desirable to solve this technical problem and asked come breakage easily-deformable when slowing down carbon fiber pipe by vertical pressure
Topic.
Summary of the invention
In order to make up for the deficiencies of the prior art, excessive easily-deformable by vertical pressure to solve carbon fiber pipe in the prior art
Damaged problem, the invention proposes a kind of carbon fiber pipes.
The technical solution adopted by the present invention to solve the technical problems is: a kind of carbon fiber pipe of the present invention, including
Carbon fiber pipe ontology；One layer of anti-electric layer is coated on the outside of the carbon fiber pipe ontology；The inside of the carbon fiber pipe ontology is embedding
There is one group of heterotypic spring, heterotypic spring is placed on the inside of carbon fiber pipe ontology vertically, and heterotypic spring is close to carbon fiber pipe ontology
The internal diameter of end is greater than its internal diameter far from carbon fiber pipe ontology one end, and carbon fiber pipe ontology is compressed by heterotypic spring when vertical force
Generate opposition；The carbon fiber pipe when in use, because it is internal embedded with one group of heterotypic spring, is encountering vertical force to carbon
When fiber tube body squeezes, it is perpendicular to generate that corresponding counterforce counteraction part carbon fiber pipe ontology is subject to for heterotypic spring compression
To extruding force, so as to slow down the speed of carbon fiber pipe ontology breakage, if the vertical extruding force mistake that carbon fiber pipe ontology is subject to
Small, heterotypic spring then can all offset it, to improve the service life of carbon fiber pipe ontology.
Preferably, the heterotypic spring is greater than heterotypic spring far from carbon fiber close to the stiffness factor of carbon fiber pipe body end
Tie up the stiffness factor of tube body end；Because heterotypic spring is greater than heterotypic spring close to the stiffness factor of carbon fiber pipe body end
Stiffness factor far from carbon fiber pipe body end, in this way when carbon fiber pipe ontology is by vertical extruding force, what end generated
Opposition is maximum, can offset a part of vertical extruding force in advance, can be to carbon fiber pipe ontology to just have from end
It is protected.
Preferably, the heterotypic spring is hollow structure；One group of cavity is offered inside the anti-electric layer along the vertical direction,
I-shaped pushing block is equipped in cavity, I-shaped pushing block and cavity form closed space；Pass through between the heterotypic spring and cavity
Tracheae connection, I-shaped pushing block is pushed out when heterotypic spring compresses；In heterotypic spring compression, inside be squeezed the gas of discharge
Body is entered in cavity by tracheae, can be released I-shaped pushing block after gas is entered in cavity, the I-shaped pushing block of release can be right
Carbon fiber pipe ontology generates certain cross force, thus slow down the carbon fiber pipe ontology speed even damaged by vertical force deformation,
Improve the service life of carbon fiber pipe ontology.
Preferably, the side of the anti-electric layer and carbon fiber pipe body contacts is equipped with extruded layer, and extruded layer is reticular structure,
And extruded layer is manufactured using elastic material, the extruded layer of reticular structure is for protecting carbon fiber pipe ontology；In I-shaped pushing block quilt
It when release, is contacted first with extruded layer, because extruded layer is elastic material manufacture, I-shaped pushing block release makes extruded layer to carbon fiber
It ties up tube body and carries out tight, to further slow down the carbon fiber pipe ontology speed even damaged by vertical force deformation, mention
The high service life of carbon fiber pipe ontology.
Preferably, the carbon fiber pipe ontology offers one group of pre-manufactured hole close to the side of extruded layer, and pre-manufactured hole is for subtracting
The stress of few carbon fiber pipe body interior；Pre-manufactured hole can discharge the stress of a part of carbon fiber pipe body interior, therefore work as carbon
When fiber tube body is by vertical extruding force, because of the presence of pre-manufactured hole, carbon fiber pipe ontology can be slowed down and deformed by vertical force
Even damaged speed.
Preferably, the pre-manufactured hole and cavity are located at same level, and one group of barb is connected in pre-manufactured hole, barb and
Extruded layer cooperates the lateral pretightning force being subject to for locking carbon fiber pipe ontology；It is contacted when I-shaped pushing block is pushed out with extruded layer
Afterwards, extruded layer can be pushed into pre-manufactured hole, because being equipped with barb in pre-manufactured hole, extruded layer is reticular structure, and extruded layer enters
It after pre-manufactured hole, is fixed by barb, i.e., I-shaped pushing block is released to the cross force pretightning force generated and is lockked, carbon fiber pipe ontology is slowed down
By the speed that vertical force deformation is even damaged.
Beneficial effects of the present invention are as follows:
1. a kind of carbon fiber pipe of the present invention is being met by being embedded in one group of heterotypic spring in carbon fiber pipe ontology
When squeezing to vertical force carbon fiber pipe ontology, heterotypic spring compression can generate corresponding counterforce counteraction part carbon fiber pipe
The vertical extruding force that ontology is subject to, so as to slow down the speed of carbon fiber pipe ontology breakage, if what carbon fiber pipe ontology was subject to
Vertical extruding force is too small, and heterotypic spring then can all offset it, to improve the service life of carbon fiber pipe ontology.
2. a kind of carbon fiber pipe of the present invention, work is coherent, and the kinetic energy generated when being compressed using heterotypic spring is pushed
I-shaped pushing block is mobile, and then I-shaped pushing block cooperation extruded layer and barb work, generate for carbon fiber pipe ontology and laterally pre-tighten
Power further slows down the carbon fiber pipe ontology speed even damaged by vertical force deformation, improves the use of carbon fiber pipe ontology
Service life.
Detailed description of the invention
The present invention will be further explained below with reference to the attached drawings.
Fig. 1 is schematic perspective view of the invention；
Fig. 2 is main view of the invention；
Fig. 3 is the partial enlarged view in Fig. 2 at A；
Fig. 4 is the partial enlarged view in Fig. 3 at B；
In figure: carbon fiber pipe ontology 1, anti-electric layer 2, heterotypic spring 3, cavity 4, I-shaped pushing block 5, tracheae 6, extruded layer 7,
Pre-manufactured hole 8, barb 9.
Specific embodiment
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, tie below
Specific embodiment is closed, the present invention is further explained.
As shown in Figures 1 to 4, a kind of carbon fiber pipe of the present invention, including carbon fiber pipe ontology 1；The carbon fiber
The outside of tube body 1 is coated with one layer of anti-electric layer 2；The inside of the carbon fiber pipe ontology 1 is embedded with one group of heterotypic spring 3, special-shaped
Spring 3 is placed on the inside of carbon fiber pipe ontology 1 vertically, and internal diameter of the heterotypic spring 3 close to 1 end of carbon fiber pipe ontology is greater than it
Internal diameter far from 1 one end of carbon fiber pipe ontology, carbon fiber pipe ontology 1 are generated acting in opposition by the compression of heterotypic spring 3 when vertical force
Power；The carbon fiber pipe when in use, because it is internal embedded with one group of heterotypic spring 3, is encountering vertical force to carbon fiber pipe ontology 1
When extruding, the compression of heterotypic spring 3 can generate the vertical extruding that corresponding counterforce counteraction part carbon fiber pipe ontology 1 is subject to
Power, it is different if the vertical extruding force that carbon fiber pipe ontology 1 is subject to is too small so as to slow down the damaged speed of carbon fiber pipe ontology 1
Type spring 3 then can all offset it, to improve the service life of carbon fiber pipe ontology 1.
As a kind of specific embodiment of the invention, stiffness of the heterotypic spring 3 close to 1 end of carbon fiber pipe ontology
Coefficient is greater than stiffness factor of the heterotypic spring 3 far from 1 end of carbon fiber pipe ontology；Because heterotypic spring 3 is close to carbon fiber pipe sheet
The stiffness factor of 1 end of body is greater than stiffness factor of the heterotypic spring 3 far from 1 end of carbon fiber pipe ontology, works as carbon fiber pipe in this way
When ontology 1 is by vertical extruding force, the opposition that end generates is maximum, can offset a part of vertical extruding force in advance,
To just have from end and can be protected to carbon fiber pipe ontology 1.
As a kind of specific embodiment of the invention, the heterotypic spring 3 is hollow structure；Inside the anti-electric layer 2
One group of cavity 4 is offered along the vertical direction, I-shaped pushing block 5 is equipped in cavity 4, and I-shaped pushing block 5 and the formation closure of cavity 4 are empty
Between；Be connected between the heterotypic spring 3 and cavity 4 by tracheae 6, heterotypic spring 3 when compressing I-shaped pushing block 5 be pushed out；?
When heterotypic spring 3 compresses, inside the be squeezed gas of discharge entered in cavity 4 by tracheae 6, after entering gas in cavity 4
I-shaped pushing block 5 can be released, the I-shaped pushing block 5 of release can generate certain cross force to carbon fiber pipe ontology 1, to subtract
Slow carbon fiber pipe ontology 1 speed even damaged by vertical force deformation, improves the service life of carbon fiber pipe ontology 1.
As a kind of specific embodiment of the invention, the side that the anti-electric layer 2 is contacted with carbon fiber pipe ontology 1 is equipped with
Extruded layer 7, extruded layer 7 is reticular structure, and extruded layer 7 is manufactured using elastic material, and the extruded layer 7 of reticular structure is for protecting
Carbon fiber pipe ontology 1；It when I-shaped pushing block 5 is pushed out, is contacted first with extruded layer 7, because extruded layer 7 is elastic material system
It makes, the I-shaped release of pushing block 5 makes extruded layer 7 carry out tight to carbon fiber pipe ontology 1, to further slow down carbon fiber pipe
The speed even damaged by vertical force deformation of ontology 1, improves the service life of carbon fiber pipe ontology 1.
As a kind of specific embodiment of the invention, the carbon fiber pipe ontology 1 is offered close to the side of extruded layer 7
One group of pre-manufactured hole 8, pre-manufactured hole 8 are used to reduce the stress inside carbon fiber pipe ontology 1；Pre-manufactured hole 8 can discharge a part of carbon fiber
The stress inside tube body 1 is tieed up, therefore when carbon fiber pipe ontology 1 is by vertical extruding force, it, can because of the presence of pre-manufactured hole 8
To slow down the speed even damaged by vertical force deformation of carbon fiber pipe ontology 1.
As a kind of specific embodiment of the invention, the pre-manufactured hole 8 is located at same level with cavity 4, and prefabricated
One group of barb 9 is connected in hole 8, barb 9 and extruded layer 7 cooperate the lateral pretightning force being subject to for locking carbon fiber pipe ontology 1；
After I-shaped pushing block 5, which is pushed out, to be contacted with extruded layer 7, extruded layer 7 can be pushed into pre-manufactured hole 8, because being set in pre-manufactured hole 8
There is barb 9, extruded layer 7 is that reticular structure is fixed by barb 9 after extruded layer 7 enters pre-manufactured hole 8, i.e., pushed away I-shaped pushing block 5
The cross force pretightning force generated out is lockked, and the speed even damaged by vertical force deformation of carbon fiber pipe ontology 1 is slowed down.
This carbon fiber pipe is first placed the discharge sequence that heterotypic spring 3 is recorded according to this specification, then root in production
Carbon fiber prepreg and the suitable Internal core mould of selection have been cut according to the specification of carbon fiber pipe, heterotypic spring 3 is placed on mould
In tool, then by mold wiped clean, one layer of release agent is coated on surface, carbon fiber prepreg is then pasted the two of mold
End is softened using the hot pressing principle prepreg of rolling machine, to uniformly roll on mold, is finished when all prepregs roll
Afterwards, one layer of OPP is wrapped on surface, is finally sent into oven, hot setting molding.
The carbon fiber pipe when in use, because it is internal embedded with one group of heterotypic spring 3, is encountering vertical force to carbon fiber pipe
Ontology 1 squeeze when, heterotypic spring 3 compression can generate corresponding counterforce counteraction part carbon fiber pipe ontology 1 be subject to it is vertical
Extruding force, so as to slow down the damaged speed of carbon fiber pipe ontology 1, if the vertical extruding force mistake that carbon fiber pipe ontology 1 is subject to
Small, heterotypic spring 3 then can all offset it, to improve the service life of carbon fiber pipe ontology 1；It is pressed in heterotypic spring 3
When contracting, inside the be squeezed gas of discharge entered in cavity 4 by tracheae 6, can be pushed away I-shaped after gas is entered in cavity 4
Block 5 is released, and the I-shaped pushing block 5 of release can generate certain cross force to carbon fiber pipe ontology 1, to slow down carbon fiber pipe sheet
The speed even damaged by vertical force deformation of body 1, improves the service life of carbon fiber pipe ontology 1；It is pushed away in I-shaped pushing block 5
It when out, is contacted first with extruded layer 7, because extruded layer 7 is elastic material manufacture, the I-shaped release of pushing block 5 makes extruded layer 7 to carbon
Fiber tube body 1 carries out tight, to further slow down the speed even damaged by vertical force deformation of carbon fiber pipe ontology 1
Degree, improves the service life of carbon fiber pipe ontology 1；After I-shaped pushing block 5, which is pushed out, to be contacted with extruded layer 7, it can will squeeze
Pressurized layer 7 is pushed into pre-manufactured hole 8, because being equipped with barb 9 in pre-manufactured hole 8, extruded layer 7 is reticular structure, and extruded layer 7 enters pre-manufactured hole
After 8, fixed by barb 9, i.e., by I-shaped pushing block 5 release generate cross force pretightning force lock, slow down carbon fiber pipe ontology 1 by
The even damaged speed of vertical force deformation.
The basic principles, main features and advantages of the invention have been shown and described above.The technical staff of the industry should
Understand, the present invention is not limited to the above embodiments, and the above embodiments and description only describe originals of the invention
Reason, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes and improvements
It all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by appended claims and its equivalent circle
It is fixed.
Claims (6)
1. a kind of carbon fiber pipe, it is characterised in that: including carbon fiber pipe ontology (1)；It wraps in the outside of the carbon fiber pipe ontology (1)
It is covered with one layer of anti-electric layer (2)；The inside of the carbon fiber pipe ontology (1) is embedded with one group of heterotypic spring (3), and heterotypic spring (3) is perpendicular
It is directly placed on the inside of carbon fiber pipe ontology (1), internal diameter of the heterotypic spring (3) close to carbon fiber pipe ontology (1) end is greater than it
Internal diameter far from carbon fiber pipe ontology (1) one end, carbon fiber pipe ontology (1) are generated anti-by heterotypic spring when vertical force (3) compression
To active force.
2. a kind of carbon fiber pipe according to claim 1, it is characterised in that: the heterotypic spring (3) is close to carbon fiber pipe
The stiffness factor of ontology (1) end is greater than the stiffness factor of heterotypic spring (3) far from carbon fiber pipe ontology (1) end.
3. a kind of carbon fiber pipe according to claim 2, it is characterised in that: the heterotypic spring (3) is hollow structure；Institute
It states and offers one group of cavity (4) inside anti-electric layer (2) along the vertical direction, be equipped with I-shaped pushing block (5) in cavity (4), it is I-shaped
Pushing block (5) and cavity (4) form closed space；It is connected between the heterotypic spring (3) and cavity (4) by tracheae (6), it is special-shaped
I-shaped pushing block (5) is pushed out when spring (3) compression.
4. a kind of carbon fiber pipe according to claim 1, it is characterised in that: the anti-electric layer (2) and carbon fiber pipe ontology
(1) side contacted is equipped with extruded layer (7), and extruded layer (7) is reticular structure, and extruded layer (7) is manufactured using elastic material, net
The extruded layer (7) of shape structure is for protecting carbon fiber pipe ontology (1).
5. a kind of carbon fiber pipe according to claim 4, it is characterised in that: the carbon fiber pipe ontology (1) is close to extruding
The side of layer (7) offers one group of pre-manufactured hole (8), and pre-manufactured hole (8) is used to reduce the internal stress of carbon fiber pipe ontology (1).
6. a kind of carbon fiber pipe according to claim 5, it is characterised in that: the pre-manufactured hole (8) and cavity (4) are located at together
One horizontal plane, and one group of barb (9) is connected in pre-manufactured hole (8), barb (9) and extruded layer (7) cooperate for locking carbon fiber
The lateral pretightning force that tube body (1) is subject to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910453540.8A CN110242824A (en) | 2019-05-28 | 2019-05-28 | A kind of carbon fiber pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910453540.8A CN110242824A (en) | 2019-05-28 | 2019-05-28 | A kind of carbon fiber pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110242824A true CN110242824A (en) | 2019-09-17 |
Family
ID=67885240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910453540.8A Pending CN110242824A (en) | 2019-05-28 | 2019-05-28 | A kind of carbon fiber pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110242824A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103256436A (en) * | 2012-10-09 | 2013-08-21 | 成都市新筑路桥机械股份有限公司 | Carbon fiber delivery pipe for delivering concrete, and production method thereof |
| WO2014110544A1 (en) * | 2013-01-14 | 2014-07-17 | Fyfe Co. Llc | High strength liner and method of use |
| CN207298113U (en) * | 2017-10-30 | 2018-05-01 | 东莞市金旺纤维制品有限公司 | A kind of high-strength carbon fiber pipe |
| CN108908950A (en) * | 2018-07-23 | 2018-11-30 | 上海复合材料科技有限公司 | A kind of carbon fiber pipe battle array structure and preparation method thereof |
| CN109502426A (en) * | 2018-11-23 | 2019-03-22 | 江苏恒神股份有限公司 | A kind of high rigidity carbon fibre composite roller |
-
2019
- 2019-05-28 CN CN201910453540.8A patent/CN110242824A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103256436A (en) * | 2012-10-09 | 2013-08-21 | 成都市新筑路桥机械股份有限公司 | Carbon fiber delivery pipe for delivering concrete, and production method thereof |
| WO2014110544A1 (en) * | 2013-01-14 | 2014-07-17 | Fyfe Co. Llc | High strength liner and method of use |
| CN207298113U (en) * | 2017-10-30 | 2018-05-01 | 东莞市金旺纤维制品有限公司 | A kind of high-strength carbon fiber pipe |
| CN108908950A (en) * | 2018-07-23 | 2018-11-30 | 上海复合材料科技有限公司 | A kind of carbon fiber pipe battle array structure and preparation method thereof |
| CN109502426A (en) * | 2018-11-23 | 2019-03-22 | 江苏恒神股份有限公司 | A kind of high rigidity carbon fibre composite roller |
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Application publication date: 20190917 |
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