CN104675894A - Engaged rubber joint and fabrication method thereof - Google Patents
Engaged rubber joint and fabrication method thereof Download PDFInfo
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- CN104675894A CN104675894A CN201510093322.XA CN201510093322A CN104675894A CN 104675894 A CN104675894 A CN 104675894A CN 201510093322 A CN201510093322 A CN 201510093322A CN 104675894 A CN104675894 A CN 104675894A
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- mandrel
- projection
- metal
- lower convexity
- coating
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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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F1/00—Springs
- F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
- F16F1/38—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers with a sleeve of elastic material between a rigid outer sleeve and a rigid inner sleeve or pin, i.e. bushing-type
- F16F1/3863—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers with a sleeve of elastic material between a rigid outer sleeve and a rigid inner sleeve or pin, i.e. bushing-type characterised by the rigid sleeves or pin, e.g. of non-circular cross-section
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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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2234/00—Shape
- F16F2234/02—Shape cylindrical
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Springs (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention relates to an engaged rubber joint, which comprises a mandrel, an elastic rubber body and a metal sleeve, and the mandrel, the elastic rubber body and the metal sleeve are integrally vulcanized together. The engaged rubber joint is characterized in that upper projections and lower projections which are distributed along the circumferential direction of the mandrel and have the same shape and size are arranged on the wall of the mandrel, the upper projections and the lower projections are symmetrically arranged relative to the central axis of the mandrel, both the upper projections and the lower projections are evenly and separately distributed along the axial direction of the mandrel, the width of the upper projection along the radial direction of the mandrel is less than or equal to the diameter of the middle part of the mandrel, and the inner wall of the metal sleeve is provided with inner upper projections engaged with the upper projections and inner lower projections engaged with the lower projections. The ratio of the radial stiffness and axial stiffness of the engaged rubber joint disclosed by the invention is less than 5:1, moreover, the radial stiffness and axial stiffness adjustment range is wide, the whole rubber joint has two different torsional stiffnesses, and therefore the service life is longer. The invention also provides a fabrication method of the engaged rubber joint.
Description
Technical field
The present invention relates to damping means technical field, particularly rubber arthrosis and preparation method thereof, be mainly used in various kinds of vehicles bogie of car rubber elastic element, be also applicable to engineering machinery vibration damping position simultaneously.
Background technique
Rubber arthrosis is a kind of conventional rubber-metal combined vibration-damping element also known as ball pivot rubber, can be widely used in various vibration damping position, especially applies very general in the bogie of rolling stock.Rubber arthrosis application structure the most general is the structure of research (metal-coating+rubber+mandrel), and the performance of this structure meets the use of various operating mode substantially, shortcoming is, when the radial/axial ratio of rigidity of rubber requires to be less than 5:1, this structure just can not meet and require that.In the last few years, along with technological progress, there is the flexuose combined rubber joint that the radial and axial ratio of rigidity that can realize being less than 5:1 requires.Such as Chinese Patent Application No. is 200710035527.8 and is called that a kind of flexuose is combined ball hinged and make assembling method, disclose that a kind of flexuose is combined ball hinged comprises metal-coating, mandrel and elastic rubbery body, metal spacer is had between metal-coating and elastic rubbery body, metal spacer is two valve structures, and metal spacer and mandrel engrail, both sawtooth mutually inlay, are engaged and sulfide.Spacer is designed to two valve structures, first mandrel, two lobe spacers and rubber elastomer curative is bonded together, then obtain finished product by interference fit press-in overcoat.Radial and axial ratio of rigidity can be realized and be less than 5:1, but also there is its narrow limitation, the metal spacer of two valve structures is placed in the complicated integral structure of the chien shih ball pivot of mandrel and overcoat, metal spacer and mandrel account for the most of space in tool metal-coating, make the elastic rubbery body Thickness Ratio that is placed between metal spacer and mandrel thinner, the space of elastic caoutchouc body thickness adjustment is little, cause the radial rigidity of ball pivot large and the compression displacement of elastic rubbery body is little, make the radial rigidity of ball pivot and axial rigidity adjustment range little, in use cannot meet the damping requirements at radial rigidity and the large vibration damping position of axial rigidity excursion, the sawtooth of whole circle is set in the circumference of metal spacer and the circumference of mandrel, make the overall deflection stiffness of ball pivot large, ball pivot aging rear easily cause elastic rubbery body to be connected with the sulfuration between metal spacer and mandrel to occur to loosen cause elastic rubbery body to bloat the even phenomenon such as metal core axle and the displacement of metal spacer shortening the working life of ball pivot.
Summary of the invention
The present invention is directed to joint type rubber in prior art in use cannot meet the damping requirements at radial rigidity and the large vibration damping position of axial rigidity excursion and working life short technical problem, the engagement rubber arthrosis provided, its radial and axial ratio of rigidity is less than 5:1 and radial and axial stiffness equivalent scope is large, whole rubber arthrosis has two different deflection stiffness, longer service life.Present invention also offers the making method of engagement rubber arthrosis.
In order to achieve the above object, the technical solution used in the present invention is: engagement rubber arthrosis, comprise mandrel, elastic rubbery body and metal-coating, mandrel, elastic rubbery body and overcoat entirety sulfide, it is characterized in that described mandrel axial wall is provided with along the distribution of described mandrel circumference and all identical projection of shape size and lower convexity, described projection and lower convexity are symmetrical arranged up and down about the medial axis of described mandrel, described projection and lower convexity are all along the axial uniform intervals distribution of described mandrel, described projection is less than or equal to the diameter in the middle part of described mandrel along the width of described mandrel radial direction, the inwall of described metal-coating to have in engaging with described projection projection and lower convexity in engaging with described lower convexity.
Further, described projection is less than the minimum width along described metal-coating radial direction between described interior projection and interior lower convexity along described mandrel radial width.
Further, described projection is cone table shape from the shape of described mandrel axial wall upper process and lower convexity from the shape of described mandrel axial wall upper process.
Further, described interior projection is cone table shape from the shape of described metal-coating inwall upper process and interior lower convexity from the shape of described metal-coating inwall upper process.
Further, the elastic rubbery body between described projection and lower convexity has the through hole along described mandrel axis.
Further, the quantity of described through hole is two and two through holes are symmetrical set about the medial axis of described mandrel.
The making method of above-described engagement rubber arthrosis, step is poly-as follows:
One, mandrel is processed into the shape with projection and lower convexity, projection and lower convexity is made all to be less than the diameter in the middle part of mandrel along the width of mandrel radial direction, the inwall of metal-coating processes interior projection and interior lower convexity, when metal-coating is enclosed within outside mandrel, projection can engage with interior projection, and lower convexity can engage with interior lower convexity;
Two, be enclosed within outside mandrel by metal-coating, projection is engaged with interior projection, and lower convexity engages with interior lower convexity;
Three, the metal-coating packaged and mandrel are inserted in vulcanization die, elastic rubbery body is injected in the gap between metal-coating and mandrel, after high temperature, high pressure sulfuration, metal-coating, elastic rubbery body and mandrel entirety are sulfided and forms rubber-metal sulfuration body;
Four, metal sulfuration body good for vulcanization forming is taken out in vulcanization die, precompression and fine finishing are carried out to metal sulfuration body, form final engagement rubber arthrosis finished product.
Further, projection is less than the minimum width along described metal-coating radial direction between interior projection and interior lower convexity along mandrel radial width, described step poly-two is specially: the entrance first one end of mandrel being aimed at metal-coating one end, projection on mandrel and lower convexity are all aimed at the metal inner surface in metal-coating between projection and interior lower convexity, then mandrel is inserted in metal-coating, projection on mandrel is all placed in metal-coating, finally by mandrel half-twist, make projection and the engagement of interior projection, lower convexity and the engagement of interior lower convexity.
Further, the poly-accurately machined operation described in four of step is included in the through hole elastic rubbery body between projection and lower convexity offered along described mandrel axis, and the quantity of through hole is two and two through holes are symmetrical set about the medial axis of described mandrel.
The invention has the beneficial effects as follows: engagement rubber arthrosis of the present invention is by metal-coating, mandrel and elastic rubbery body sulfuration are connected to form, decrease the metal spacer of two valve structures compared to existing technology, the structure of rubber arthrosis is more simplified, mandrel arranges laterally zygomorphic projection and lower convexity, for vacant space is not protruding between lower convexity and projection, the inwall of metal-coating arranges in engaging with projection projection and lower convexity in engaging with lower convexity, metal-coating and mandrel are set with, after injecting elastic rubbery body between metal-coating and mandrel, vacant space between projection and lower convexity is all filled elastic rubbery body, the thickness of elastic rubbery body between projection and lower convexity is much larger than the thickness of elastic rubbery body between flexuose mandrel and metal spacer in prior art, reduce the radial rigidity of rubber arthrosis, increase elastic caoutchouc body thickness adjustment space and compression displacement amount, make the adjustment range of the radial rigidity of rubber arthrosis and axial rigidity larger, the damping requirements at radial rigidity and the large vibration damping position of axial rigidity excursion can be met, elastic rubbery body is divided into the elastic rubbery body of the above and below elastic rubbery body at engagement position of mandrel axial wall and the vacant space between projection and lower convexity in the inside of metal-coating, the elastic rubbery body of vacant space is larger than the elastic rubbery body pre compressed magnitude at engagement position, rubber free surface is wider, therefore engage rubber arthrosis and there are two different deflection stiffness, and the deflection stiffness of the elastic rubbery body of vacant space is less than the deflection stiffness of mate elastic rubbery body, the deflection stiffness that rubber arthrosis entirety is born is less, elastic rubbery body is connected with the sulfuration between metal-coating and axle core and is not easy to occur to loosen, the longer service life of rubber arthrosis.The making method of engagement rubber arthrosis of the present invention, by regulating projection and lower convexity to regulate the radial direction of rubber arthrosis and axial ratio of rigidity along the quantity of mandrel axial distribution and projection along the width of mandrel radial direction, make the rubber arthrosis produced can meet radial direction and axial rigidity than being less than 5 and the damping requirements of radial rigidity and the large damping means of axial rigidity excursion.
Accompanying drawing explanation
Fig. 1 is the three-dimensional cutaway view of the engagement rubber arthrosis in embodiment.
Fig. 2 is the perspective view of mandrel.
Fig. 3 is the plane structure schematic diagram of mandrel.
Fig. 4 is the A direction view of Fig. 3.
Fig. 5 is the structural representation of metal-coating.
Fig. 6 is the A direction view of Fig. 5.
Fig. 7 is the side view engaging rubber arthrosis in embodiment.
Fig. 8 is the working process schematic diagram of step 2 and step 3 in the making method of engagement rubber arthrosis in example.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated.
As shown in Figures 1 to 7, engagement rubber arthrosis, comprise mandrel 1, elastic rubbery body 2 and metal-coating 3, mandrel 1, elastic rubbery body 2 and overcoat 3 entirety sulfide, described mandrel 1 axial wall is provided with along the distribution of described mandrel 1 circumference and all identical projection 11 of shape size and lower convexity 12, described projection 11 and lower convexity 12 are symmetrical arranged up and down about the medial axis of described mandrel 1, described projection 11 and lower convexity 12 are all along the axial uniform intervals distribution of described mandrel 1, described projection 11 is less than or equal to the diameter in the middle part of described mandrel 1 along the width of described mandrel 1 radial direction, the inwall of described metal-coating 3 to have in engaging with described projection 11 projection 31 and lower convexity 32 in engaging with described lower convexity 12.Described projection 11 along described mandrel 1 radial width L be less than described between projection 31 and interior lower convexity 32 along the minimum width H of described metal-coating 3 radial direction, can easily mandrel 1 be inserted in metal-coating 3 when the projection 11 of mandrel 1 and lower convexity to be aimed at respectively in metal-coating 3 between projection 31 and interior lower convexity 31.Described projection 11 is cone table shape from the shape of described mandrel 1 axial wall upper process and lower convexity 12 from the shape of described mandrel 1 axial wall upper process.Described interior projection 31 is cone table shape from the shape of described metal-coating 3 inwall upper process and interior lower convexity 32 from the shape of described metal-coating 3 inwall upper process.Elastic rubbery body 2 between described projection 13 and lower convexity 12 has the through hole 21 along described mandrel 1 axis.The quantity of described through hole 21 is two and two through holes 21 are symmetrical set about the medial axis of described mandrel 1.Through hole 21 makes elastic rubbery body 2 be had larger compression volume when compressing, and increases the free surface of rubber, makes the elastic rubbery body 2 between projection 11 and lower convexity 12 be not easy to be bloated when compressing.
Above-mentioned engagement rubber arthrosis decreases the metal spacer of two valve structures compared to existing technology, the structure of rubber arthrosis is more simplified, mandrel 1 arranges symmetrical projection 11 and lower convexity 12, for vacant space is not protruding between lower convexity 11 and projection 12, the inwall of metal-coating arranges in engaging with projection 11 projection 31 and lower convexity 32 in engaging with lower convexity 12, metal-coating 3 and mandrel 1 are set with, after injecting elastic rubbery body 2 between metal-coating 3 and mandrel 1, vacant space between projection 11 and lower convexity 12 is all filled elastic rubbery body, the thickness of elastic rubbery body 2 between projection and lower convexity is much larger than the thickness of elastic rubbery body between flexuose mandrel and metal spacer in prior art, reduce the radial rigidity of rubber arthrosis, increase elastic rubbery body 2 thickness adjustment space and compression displacement amount, make the adjustment range of the radial rigidity of rubber arthrosis and axial rigidity larger, the damping requirements at radial rigidity and the large vibration damping position of axial rigidity excursion can be met, elastic rubbery body 2 is divided into the elastic rubbery body of the elastic rubbery body at the above and below engagement position of mandrel 1 axial wall and the vacant space between projection 11 and lower convexity 12 in the inside of metal-coating, the elastic rubbery body of vacant space is larger than the elastic rubbery body pre compressed magnitude at engagement position, rubber free surface is wider, therefore engage rubber arthrosis and there are two different deflection stiffness, and the deflection stiffness of the elastic rubbery body of vacant space is less than the deflection stiffness of mate elastic rubbery body, the deflection stiffness that rubber arthrosis entirety is born is less, elastic rubbery body is connected with the sulfuration between metal-coating and axle core and is not easy to occur to loosen, the longer service life of rubber arthrosis.
The making method of above-described engagement rubber arthrosis, step is poly-as follows:
One, mandrel 1 is processed into the shape with projection 11 and lower convexity 12, projection 11 and lower convexity 12 is made all to be less than the diameter in the middle part of mandrel 1 along the width of mandrel 1 radial direction, the inwall of metal-coating 3 processes interior projection 31 and interior lower convexity 32, when metal-coating 3 is enclosed within outside mandrel 1, projection 11 can engage with interior projection 31, and lower convexity 12 can engage with interior lower convexity 32;
Two, projection 11 is less than the minimum width H along described metal-coating 3 radial direction between interior projection 31 and interior lower convexity 32 along mandrel 1 radial width L, first one end of mandrel 1 is aimed at the entrance of metal-coating 3 one end, as shown in Figure 8, projection 11 on mandrel 1 and lower convexity 12 are all aimed at the metal inner surface in metal-coating 3 between projection 31 and interior lower convexity 32, then mandrel 1 is inserted in metal-coating 3, projection 11 on mandrel 1 is all placed in metal-coating, finally by mandrel 1 half-twist, projection 11 and interior projection 31 are engaged, lower convexity 12 and interior lower convexity 32 engage,
Three, the metal-coating 3 packaged and mandrel 1 are inserted in vulcanization die, elastic rubbery body 2 is injected in the gap between metal-coating 3 and mandrel 1, after high temperature, high pressure sulfuration, metal-coating 3, elastic rubbery body 2 and mandrel 1 entirety are sulfided and forms rubber-metal sulfuration body;
Four, metal sulfuration body good for vulcanization forming is taken out in vulcanization die, precompression and fine finishing are carried out to metal sulfuration body, form final engagement rubber arthrosis finished product.The elastic rubbery body 2 that wherein fine finishing is included between projection 13 and lower convexity 12 is offered the operation of the through hole 21 along described mandrel 1 axis, the quantity of through hole 21 is two and two through holes 21 are symmetrical set about the medial axis of described mandrel 1.
The making method of above-mentioned engagement rubber arthrosis, by regulating projection 11 and lower convexity 12 to regulate the radial direction of rubber arthrosis and axial ratio of rigidity along the quantity of mandrel axial distribution and projection 11 along the width of mandrel radial direction, make the rubber arthrosis produced can meet radial direction and axial rigidity than being less than 5 and the damping requirements of radial rigidity and the large damping means of axial rigidity excursion.
Below by reference to the accompanying drawings complete description is carried out to the technological scheme of embodiments of the invention, it should be noted that described embodiment is only a part of embodiment of the present invention.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite not making creative work, belongs to the scope of protection of the invention.
Claims (9)
1. engage rubber arthrosis, comprise mandrel (1), elastic rubbery body (2) and metal-coating (3), mandrel (1), elastic rubbery body (2) and overcoat (3) entirety sulfide, it is characterized in that described mandrel (1) axial wall is provided with along the distribution of described mandrel (1) circumference and all identical projection (11) of shape size and lower convexity (12), described projection (11) and lower convexity (12) are symmetrical arranged up and down about the medial axis of described mandrel (1), described projection (11) and lower convexity (12) are all along the axial uniform intervals distribution of described mandrel (1), described projection (11) is less than or equal to the diameter at described mandrel (1) middle part along the width that described mandrel (1) is radial, the interior lower convexity (32) inwall of described metal-coating (3) having the interior projection (31) engaged with described projection (11) and engage with described lower convexity (12).
2. engagement rubber arthrosis according to claim 1, is characterized in that described projection (11) is less than minimum width radial along described metal-coating (3) between described interior projection (31) and interior lower convexity (32) along described mandrel (1) radial width.
3. engagement rubber arthrosis according to claim 2, is characterized in that described projection (11) is cone table shape from the shape of described mandrel (1) axial wall upper process and lower convexity (12) from the shape of described mandrel (1) axial wall upper process.
4. engagement rubber arthrosis according to claim 3, is characterized in that described interior projection (31) is cone table shape from the shape of described metal-coating (3) inwall upper process and interior lower convexity (32) from the shape of described metal-coating (3) inwall upper process.
5. engagement rubber arthrosis according to claim 4, is characterized in that the elastic rubbery body (2) between described projection (13) and lower convexity (12) having along the axial through hole (21) of described mandrel (1).
6. engagement rubber arthrosis according to claim 5, is characterized in that the quantity of described through hole (21) is two and two through holes (21) are symmetrical set about the medial axis of described mandrel (1).
7. the making method of the engagement rubber arthrosis described in claim 1 to any one of claim 6, step is poly-as follows:
One, mandrel (1) is processed into the shape with projection (11) and lower convexity (12), projection (11) and lower convexity (12) is made all to be less than the diameter at mandrel (1) middle part along the width that mandrel (1) is radial, the inwall of metal-coating (3) processes interior projection (31) and interior lower convexity (32), when metal-coating (3) is enclosed within outside mandrel (1), projection (11) can engage with interior projection (31), and lower convexity (12) can engage with interior lower convexity (32);
Metal-coating (3) is enclosed within mandrel (1) outside, projection (11) is engaged with interior projection (31), and lower convexity (12) engages with interior lower convexity (32);
The metal-coating packaged (3) and mandrel (1) are inserted in vulcanization die, elastic rubbery body (2) is injected in the gap between metal-coating (3) and mandrel (1), after high temperature, high pressure sulfuration, metal-coating (3), elastic rubbery body (2) and mandrel (1) entirety are sulfided and forms rubber-metal sulfuration body;
Metal sulfuration body good for vulcanization forming is taken out in vulcanization die, precompression and fine finishing are carried out to metal sulfuration body, form final engagement rubber arthrosis finished product.
8. the making method of engagement rubber arthrosis according to claim 7, it is characterized in that projection (11) is less than minimum width radial along described metal-coating (3) between interior projection (31) and interior lower convexity (32) along mandrel (1) radial width, described step poly-two is specially: the entrance first one end of mandrel (1) being aimed at metal-coating (3) one end, projection (11) on mandrel (1) and lower convexity (12) are all aimed at the metal inner surface between metal-coating (3) interior projection (31) and interior lower convexity (32), then mandrel (1) is inserted in metal-coating (3), projection (11) on mandrel (1) is all placed in metal-coating, finally by mandrel (1) half-twist, make projection (11) and interior projection (31) engagement, lower convexity (12) and interior lower convexity (32) engagement.
9. the making method of engagement rubber arthrosis according to claim 8, it is characterized in that walking the through hole (21) elastic rubbery body (2) that poly-accurately machined operation described in four is included between projection (13) and lower convexity (12) offered along described mandrel (1) axis, the quantity of through hole (21) is two and two through holes (21) are symmetrical set about the medial axis of described mandrel (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510093322.XA CN104675894B (en) | 2015-03-03 | 2015-03-03 | Engagement rubber arthrosis itself and manufacture method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510093322.XA CN104675894B (en) | 2015-03-03 | 2015-03-03 | Engagement rubber arthrosis itself and manufacture method |
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| CN104675894B CN104675894B (en) | 2016-11-16 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110360256A (en) * | 2019-08-27 | 2019-10-22 | 株洲时代新材料科技股份有限公司 | A kind of package assembly and assemble method of axlebox rod flexural pivot |
| CN110435700A (en) * | 2019-08-27 | 2019-11-12 | 株洲时代新材料科技股份有限公司 | A kind of the stiffness tuning structure and stiffness tuning method of axlebox rod flexural pivot |
| CN110435699A (en) * | 2019-08-27 | 2019-11-12 | 株洲时代新材料科技股份有限公司 | The longitudinal rigidity adjustment structure and longitudinal rigidity adjusting method of axlebox rod flexural pivot |
| CN110466556A (en) * | 2019-08-27 | 2019-11-19 | 株洲时代新材料科技股份有限公司 | A kind of the stiffness tuning structure and method of the rubber bodies of axlebox rod flexural pivot |
| CN113821916A (en) * | 2021-08-31 | 2021-12-21 | 株洲时代新材料科技股份有限公司 | Method for reducing deflection rigidity of rubber joint under radial preload |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110435699A (en) * | 2019-08-27 | 2019-11-12 | 株洲时代新材料科技股份有限公司 | The longitudinal rigidity adjustment structure and longitudinal rigidity adjusting method of axlebox rod flexural pivot |
| CN110466556A (en) * | 2019-08-27 | 2019-11-19 | 株洲时代新材料科技股份有限公司 | A kind of the stiffness tuning structure and method of the rubber bodies of axlebox rod flexural pivot |
| CN113821916A (en) * | 2021-08-31 | 2021-12-21 | 株洲时代新材料科技股份有限公司 | Method for reducing deflection rigidity of rubber joint under radial preload |
| CN113821916B (en) * | 2021-08-31 | 2024-09-03 | 株洲时代新材料科技股份有限公司 | Method for reducing deflection stiffness of rubber joint under bearing radial preload |
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|---|---|
| CN104675894B (en) | 2016-11-16 |
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