CN107882995A - A kind of more lip labyrinth-type excluders - Google Patents
A kind of more lip labyrinth-type excluders Download PDFInfo
- Publication number
- CN107882995A CN107882995A CN201710956037.5A CN201710956037A CN107882995A CN 107882995 A CN107882995 A CN 107882995A CN 201710956037 A CN201710956037 A CN 201710956037A CN 107882995 A CN107882995 A CN 107882995A
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- Prior art keywords
- ring
- wing
- labyrinth
- sealing
- sealing ring
- 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.)
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Links
- 238000007789 sealing Methods 0.000 claims abstract description 108
- 210000001364 upper extremity Anatomy 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims abstract description 4
- 239000004033 plastic Substances 0.000 claims abstract description 4
- 229920003023 plastic Polymers 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 3
- 239000010687 lubricating oil Substances 0.000 description 10
- 239000003921 oil Substances 0.000 description 5
- 239000000498 cooling water Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005461 lubrication Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
-
- 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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/44—Free-space packings
- F16J15/447—Labyrinth packings
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
- Sealing Devices (AREA)
Abstract
The invention belongs to rod-rolling mill accessory technical field, in particular relates to a kind of more lip labyrinth-type excluders.Its structure of the technical scheme of the component is formed to be formed by the sealing mechanism that elastic seal ring and steel-made support circle are formed made of the rubber-plastics material with bi-wing configuration in eccentric disc and the upper and lower sealing ring for being enclosed on the sealing mechanism both sides can be enclosed on；The upper limb or upper and lower wing top shoulder for forming the sealing ring bi-wing configuration are provided with wing ring；The medial surface of the upper sealing ring is provided with bulge loop corresponding with the wing ring, and the bulge loop and corresponding wing interannular are non-contact structure so that both form labyrinth structure.More lip labyrinth-type excluders not only have it is simple in construction, change that speed is fast, and sealing effectiveness is excellent.
Description
Technical field
The invention belongs to rod-rolling mill accessory technical field, more particularly to more lip fans that a kind of high speed wire rod finishing block uses
Palace formula sealing device.
Background technology
Sealing device is the accessory being used on five generations or six substituting metal wire finishing mills, and its structure is by eccentric disc and is enclosed on
The sealing mechanism and be enclosed on this that the steel-made support circle of sealing ring and side disposed within the eccentric disc with bi-wing configuration is formed
The upper-lower seal ring of sealing mechanism top and bottom is formed.Eccentric disc and rotating shaft are nested and are fixed on the frame of wire finishing mill during use
On.Because sealing ring is consumable accessory, must constantly change in use；It is first to tear eccentric disc open that it, which changes process,
Under, steel-made support circle and sealing ring are taken away after, then new steel-made support circle and sealing ring installed, then again fill eccentric disc
In frame.Therefore there is the slow-footed defect of the disassembling, assembling and replacing of double-lip seal mechanism, production efficiency has been had a strong impact on.For
This, China Patent No. is that 201320141183.X utility model patent discloses a kind of finishing mill double-lip seal device.Form
The structure of the sealing device by eccentric disc, be enclosed in the eccentric disc with bi-wing configuration sealing ring and steel-made support circle form；
One sidepiece of the wherein inner ring surface of eccentric disc is provided with platform ring, is provided with the middle part of sealing ring bi-wing configuration and is structure as a whole therewith
Ring body, the ring body is stuck on described platform ring.The sealing device of the structure has simple in construction, the fireballing spy of replacing
Point, but in use, often there are the water outside its equipment and other impurities and pass through the upper and lower sealing that is enclosed on sealing mechanism
Ring infiltrates into device interior, i.e., there is the defects of sealing effectiveness difference.
To solve the above problems, China Patent No. is 201610172342.0, application publication number is CN105570467A's
Application for a patent for invention discloses a kind of high speed wire rod finishing block sealing device；Form the sealing device structure include eccentric disc,
The sealer that elastic seal ring made of rubber-plastics material with bi-wing configuration and steel-made support circle are formed is enclosed in the eccentric disc
Structure and the upper and lower sealing ring composition for being enclosed on the sealing mechanism both sides；At least one wing is provided with sealing ring bi-wing configuration
Ring, the medial surface of upper and lower sealing ring, which is provided with, corresponding with above-mentioned wing ring forms bulge loop in sealing contact.The sealing dress of the structure
Although the characteristics of putting and good sealing effect fast with simple in construction, replacing speed, in use due to upper-lower seal
Ring rotates at a high speed with roll mandrel, and the medial surface of the wing ring and upper and lower sealing ring of the sealing ring is in sealing contact, can cause seriously to grind
Damage, reduce the service life of the upper and lower sealing ring and corresponding sealing ring that form the sealing device；It is close frequently to change this
Seal apparatus can cause to have a strong impact on to production.
The content of the invention
It is not only simple in structure it is an object of the invention to provide one kind, changes that speed is fast, good sealing effect, and uses the longevity
Order relatively long more lip labyrinth-type excluders.
To achieve the above object, the technical solution adopted by the present invention is：
A kind of more lip labyrinth-type excluders, its structure by
By that can be enclosed in eccentric disc made of the rubber-plastics material with bi-wing configuration, elastic seal ring and steel-made support circle are formed
Sealing mechanism and be enclosed on the sealing mechanism both sides upper and lower sealing ring form；
Form the upper limb of the sealing ring bi-wing configuration or
Upper and lower wing top shoulder is provided with wing ring；
The medial surface of the upper sealing ring is provided with bulge loop corresponding with the wing ring, and the bulge loop and corresponding wing interannular
For non-contact structure so that both form labyrinth structure.
Forming above-mentioned more lip labyrinth-type excluder additional technical features also includes：
--- the medial surface of the lower sealing ring is provided with bulge loop corresponding with the wing ring, and the bulge loop and the corresponding wing
Interannular is non-contact structure so that both form labyrinth structure；
--- the ring body being structure as a whole therewith is provided with the middle part of the sealing ring bi-wing configuration, the ring body can be stuck in
On the platform ring that one sidepiece of the eccentric disc inner ring surface is set；
--- the steel-made support circle is that loop configuration is fixed on the ring medial surface of sealing ring；
--- the steel-made support circle is that the circle composition for being integrally connected structure is provided with the outside of annulus, the steel-made support
Circle is embedded in the ring body；
--- if the lateral surface of the double-vane is provided with the secondary wing ring of dried layer；
--- if the lateral surface of the double-vane is provided with the secondary wing ring of dried layer, is provided with the upper and lower sealing ring medial surface
The secondary bulge loop of non-contact structure is correspondingly formed with this wing ring；
--- the end of the double-vane is hair brush structure, and the end hairbrush is formed with the upper-lower seal ring and is tightly connected.
A kind of more lip labyrinth-type excluders provided by the present invention compared with prior art, have advantages below：First,
Due to form sealing ring bi-wing configuration top shoulder be provided with wing ring, it is upper or and lower sealing ring medial surface be provided with
Corresponding to the wing ring and non-tight contact bulge loop so that sealing mechanism and it is upper or labyrinth structure is formd between lower sealing ring,
Abrasion will not be produced between the upper and lower sealing ring of rotation and the ring body being enclosed on eccentric disc at a high speed with roll mandrel, is greatly prolonged
Its service life；If second, the secondary wing ring due to being provided with dried layer in the lateral surface of double-vane, this wing ring and accompanying pair
The lateral surface of the wing forms ditch ring increase moisture storage capacity, can effectively prevent water from being permeated by both shoulders into lower seal, further carry
Its high sealing property；Third, due to being provided with the ring body being structure as a whole therewith, the ring in the middle part of sealing ring bi-wing configuration
On the platform ring that the sidepiece that circle body can be directly clamped among the inner ring surface for forming eccentric disc is set；Only need to be by structure when changing sealing ring
Ring body into sealing ring is pulled down, and without eccentric disc is removed, therefore, during use there is sealing ring to change fireballing
Feature, be advantageous to the raising of production efficiency.
Brief description of the drawings
Fig. 1：The cross-sectional view of more lip labyrinth-type excluders on roll mandrel；
Fig. 2：For the cross-sectional view of the first more lip labyrinth-type excluder；
Fig. 3：The cross-sectional view of the labyrinth-type excluder of lip more than second.
Embodiment
The structure and operation principle of more lip labyrinth-type excluders provided by the present invention are made into one below in conjunction with the accompanying drawings
The detailed description of step.
As shown in 1,2 figures, for the section of more lip labyrinth-type excluders provided by the present invention on roll mandrel
Structural representation, that is, the sealing device that is sleeved on eccentric disc 1 is radially fixed in steel rolling at a high speed on the roll mandrel 20 of rotation, should
Sealing device is used for the hermetic separation of the cooling water and lubricating oil in roller case 22 of steel rolling collars 21.Wherein form above-mentioned sealing device
Structure by sealing mechanism and be enclosed on the upper and lower sealing ring 10,11 of its both sides and form；Above-mentioned sealing mechanism is by that can be enclosed on bias
The steel-made support circle 3 with upper and lower double-vane 4, the sealing ring 2 of 5 structures and side disposed within is formed in disk 1；In above-mentioned eccentric disc
A sidepiece of inner ring surface be provided with platform ring 6, and be provided with the middle part of the upper and lower double-vane 4 of sealing ring, 5 structures and be integrated knot therewith
The ring body 7 of structure, the ring body are stuck on this ring；Simultaneously the wing is provided with the top shoulder of above-mentioned sealing ring bi-wing configuration
Ring 12, it is provided with and above-mentioned 12 corresponding bulge loop of wing ring in the medial surface for the upper sealing ring 10 to cooling water isolating seal
13, and be the non-contact structure with spacing 15 between the bulge loop 13 and corresponding wing ring 12 so that both form labyrinth knot
Structure.
Its operation principle is：During rolling concrete steel bar 23, upper and lower sealing ring rotates at a high speed with the roll mandrel 20 of rotation, containing big
While measuring the 17 impinging cooling collars of cooling water of impurity, it can be entered by the upper sealing ring 101 of the upper sealing device 24 of roll mandrel
Enter in formed labyrinth 102, but due to the stop of upper limb ring 121, its shipwreck leaked into by by ring body 7 and it is upper,
The passage 123 that the apical ring 122 of lower sealing ring is formed enters at oil-tightening lower double-vane 5；When upper-lower seal ring is with the roll of rotation
When axle 20 is rotated at a high speed to its lower axle position（I.e. roll mandrel bottom sealing device 25 when）, the leak in labyrinth can be by under this
The inwall of the upper sealing ring 102 of position sealing device 25 is thrown away.So as to realize sealing of the upper sealing ring of sealing device to cooling water,
Prevent it from entering the lubrication oiling roller case 22 of respective side.Be with above-mentioned corresponding oil seal principle, due to the middle gear of roller case 22,
The lubricating oil 18 of bearing cooling lubrication, when the oil-tightening lower sealing ring 11 that is used for for forming sealing device forms the upper sealing ring of axle
When 111, lubricating oil can be flowed into annular seal space 113 by lower double-vane 5, but stop due to bottom wing ring 124 and Seal Oil is viscous
Spend it is high, then when it instills axle bottom lower sealing ring 112 by bottom wing ring 124, then the lower sealing ring 112 that can be rotated at a high speed
Throw away into roller case 22, the excessive of lubricating oil can be prevented, effectively realize the sealing of lubricating oil.
The sealing device of the structure, only need to be by sealing ring 2 and disposed within due to when changing the sealing ring of sealing mechanism
The steel-made support circle 3 of side removes and installs, without eccentric disc 1 is unloaded.
It is the structural representation of the labyrinth-type excluder of lip more than second provided by the present invention as shown in 3 figures.Its structure
It is that steel-made support circle is to be provided with to be integrally connected the circle 9 of structure and form on the outside of annulus, and the steel-made support circle is embedding
Enter in above-mentioned ring body, be integrally formed structure.The sealing mechanism of the structure, sealing ring need to only be removed and installed, more
Add conveniently.
In the above-mentioned such as structure of Fig. 1,2 and Fig. 3 more lip labyrinth-type excluders,
--- in order to further improve the sealing effectiveness of lubricating oil, it is right with above-mentioned wing ring 12 to be provided with the medial surface of lower sealing ring
The bulge loop 131 answered, and be non-contact structure between the bulge loop 131 and corresponding wing ring 12, both form labyrinth structure ---
Form the bulge loop 131 of the labyrinth structure（Bulge loop 131 on i.e. upper sealing ring 111）It can realize to entering lubrication therein
The stop of oil, and when turning to lower axle position position, lubricating oil can throw away labyrinth by the lower sealing ring 112 of high speed rotation（I.e.
Above-mentioned annular seal space 113）114；Simultaneously because the upper and lower sealing ring 10,11 of rotation and wing ring are non-contact labyrinth structure at a high speed, no
Abrasion can be produced and greatly prolong its service life, improve production efficiency；
If --- when being provided with the secondary wing ring 16 of dried layer in the lateral surface of above-mentioned upper and lower double-vane 4,5, it can not only improve labyrinth
In leak into the storage volumes of water or lubricating oil（The surface of each wing ring and double-vane forms the volume 161 of a triangle）,
And the position of leak or oil leak in the labyrinth 102 or annular seal space 113 is also improved when it turns to axle bottom so that high
The upper and lower sealing ring 10,11 of speed rotation is easier to be thrown away；
--- certainly, if the lateral surface of above-mentioned double-vane 4,5 is provided with secondary wing ring 16 of dried layer, can also state it is upper and lower
Sealing ring medial surface is provided with the secondary bulge loop 105 and 115 that non-contact structure is correspondingly formed with this wing ring, it is easier to realizes labyrinth
102 or annular seal space 113 in leak or oil leak throw away；
--- when the end 14 of above-mentioned double-vane is hair brush structure, the end hairbrush forms soft seal with above-mentioned upper-lower seal ring and connected
Connect, not only contribute to sealing property, the end that can also effectively reduce double-vane and the upper and lower sealing ring 10,11 of rotation at a high speed
Abrasion, is advantageous to the extension of its service life.
In addition, in a kind of above-mentioned structure of more lip labyrinth-type excluders is formed, due to forming the sealing ring 2 of the device
Bi-wing configuration in bottom wing 5 to push up the purpose of wing ring 124 set on shoulder be to be formed with bulge loop 131 due to preventing lubricating oil from oozing
The labyrinth mechanism of leakage, but due to the sticky characteristic of lubricating oil, therefore the wing ring 124 on bottom wing 5 can be deleted in a device, i.e.,
It can equally reach good sealing effect, the relatively long purpose of service life of the present invention in the wing ring only on upper limb.
Claims (8)
1. a kind of more lip labyrinth-type excluders, its structure by
By that can be enclosed in eccentric disc made of the rubber-plastics material with bi-wing configuration, elastic seal ring and steel-made support circle are formed
Sealing mechanism and be enclosed on the sealing mechanism both sides upper and lower sealing ring form；
It is characterized in that：
Form the upper limb of the sealing ring bi-wing configuration or
Upper and lower wing top shoulder is provided with wing ring；
The medial surface of the upper sealing ring is provided with bulge loop corresponding with the wing ring, and the bulge loop and corresponding wing interannular
For non-contact structure so that both form labyrinth structure.
A kind of 2. more lip labyrinth-type excluders as claimed in claim 1, it is characterised in that：The medial surface of the lower sealing ring
Bulge loop corresponding with the wing ring is provided with, and the bulge loop and corresponding wing interannular are non-contact structure so that both shapes
Into labyrinth structure.
A kind of 3. more lip labyrinth-type excluders as claimed in claim 1, it is characterised in that：The sealing ring bi-wing configuration
Middle part is provided with the ring body being structure as a whole therewith, and the sidepiece that the ring body can be stuck in the eccentric disc inner ring surface is set
Platform ring on.
A kind of 4. more lip labyrinth-type excluders as claimed in claim 1, it is characterised in that：The steel-made support circle is annular
Structure is fixed on the ring medial surface of sealing ring.
A kind of 5. more lip labyrinth-type excluders as claimed in claim 1, it is characterised in that：The steel-made support circle is in circle
The circle composition for being integrally connected structure is provided with the outside of ring, the steel-made support circle is embedded in the ring body.
A kind of 6. more lip labyrinth-type excluders as claimed in claim 1, it is characterised in that：Set in the lateral surface of the double-vane
If it is equipped with the secondary wing ring of dried layer.
A kind of 7. more lip labyrinth-type excluders as claimed in claim 1, it is characterised in that：Set in the lateral surface of the double-vane
If being equipped with the secondary wing ring of dried layer, it is provided with the upper and lower sealing ring medial surface and is correspondingly formed non-contact structure with this wing ring
Secondary bulge loop.
A kind of 8. more lip labyrinth-type excluders as claimed in claim 1, it is characterised in that：The end of the double-vane is hairbrush
Structure, the end hairbrush are formed with the upper-lower seal ring and are tightly connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710956037.5A CN107882995A (en) | 2017-10-15 | 2017-10-15 | A kind of more lip labyrinth-type excluders |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710956037.5A CN107882995A (en) | 2017-10-15 | 2017-10-15 | A kind of more lip labyrinth-type excluders |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107882995A true CN107882995A (en) | 2018-04-06 |
Family
ID=61781404
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710956037.5A Withdrawn CN107882995A (en) | 2017-10-15 | 2017-10-15 | A kind of more lip labyrinth-type excluders |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107882995A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110388466A (en) * | 2019-08-27 | 2019-10-29 | 衡水哈西特液压机械有限公司 | A kind of high-speed rod-rolling mill quick-changing type sealing hydrocarbons system |
| CN111750111A (en) * | 2020-08-08 | 2020-10-09 | 宋阳 | Quick-change type oil-gas sealing system |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001042672A1 (en) * | 1999-12-10 | 2001-06-14 | Sundwig Gmbh | Antifriction bearing for a shaft or roller and method for lubricating such an antifriction bearing |
| CN201306449Y (en) * | 2008-11-28 | 2009-09-09 | 广州机械科学研究院 | Double-lip seal structure used for oil film bearing of high-speed wire rolling mill |
| CN101910692A (en) * | 2007-11-20 | 2010-12-08 | 费德罗-莫格尔公司 | Non-contact labyrinth seal assembly and construction method thereof |
| CN201836392U (en) * | 2010-10-26 | 2011-05-18 | 浙江五洲新春集团有限公司 | Labyrinth sealing ring and bearing sealing structure |
| CN102259115A (en) * | 2011-04-22 | 2011-11-30 | 汉威(广州)机械设备有限公司 | Waterproof compressed air sweeping system with double-lip seal for high-speed wire rolling mill |
| CN102575774A (en) * | 2009-10-22 | 2012-07-11 | 谢夫勒科技股份两合公司 | Non-contact sealing ring and sealing arrangement |
| CN105570467A (en) * | 2016-03-24 | 2016-05-11 | 衡水哈西特液压机械有限公司 | Sealing member of high-speed wire rolling mill |
| CN207316073U (en) * | 2017-10-15 | 2018-05-04 | 衡水哈西特液压机械有限公司 | A kind of more lip labyrinth-type excluders |
-
2017
- 2017-10-15 CN CN201710956037.5A patent/CN107882995A/en not_active Withdrawn
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001042672A1 (en) * | 1999-12-10 | 2001-06-14 | Sundwig Gmbh | Antifriction bearing for a shaft or roller and method for lubricating such an antifriction bearing |
| CN101910692A (en) * | 2007-11-20 | 2010-12-08 | 费德罗-莫格尔公司 | Non-contact labyrinth seal assembly and construction method thereof |
| CN201306449Y (en) * | 2008-11-28 | 2009-09-09 | 广州机械科学研究院 | Double-lip seal structure used for oil film bearing of high-speed wire rolling mill |
| CN102575774A (en) * | 2009-10-22 | 2012-07-11 | 谢夫勒科技股份两合公司 | Non-contact sealing ring and sealing arrangement |
| CN201836392U (en) * | 2010-10-26 | 2011-05-18 | 浙江五洲新春集团有限公司 | Labyrinth sealing ring and bearing sealing structure |
| CN102259115A (en) * | 2011-04-22 | 2011-11-30 | 汉威(广州)机械设备有限公司 | Waterproof compressed air sweeping system with double-lip seal for high-speed wire rolling mill |
| CN105570467A (en) * | 2016-03-24 | 2016-05-11 | 衡水哈西特液压机械有限公司 | Sealing member of high-speed wire rolling mill |
| CN207316073U (en) * | 2017-10-15 | 2018-05-04 | 衡水哈西特液压机械有限公司 | A kind of more lip labyrinth-type excluders |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110388466A (en) * | 2019-08-27 | 2019-10-29 | 衡水哈西特液压机械有限公司 | A kind of high-speed rod-rolling mill quick-changing type sealing hydrocarbons system |
| CN111750111A (en) * | 2020-08-08 | 2020-10-09 | 宋阳 | Quick-change type oil-gas sealing system |
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|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20180406 |
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| WW01 | Invention patent application withdrawn after publication |