CN109262126A - Cooling water anti-drop device - Google Patents
Cooling water anti-drop device Download PDFInfo
- Publication number
- CN109262126A CN109262126A CN201811300702.6A CN201811300702A CN109262126A CN 109262126 A CN109262126 A CN 109262126A CN 201811300702 A CN201811300702 A CN 201811300702A CN 109262126 A CN109262126 A CN 109262126A
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- China
- Prior art keywords
- cylinder
- cooling water
- guide rod
- drop device
- electrode
- 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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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/36—Auxiliary equipment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/10—Spot welding; Stitch welding
- B23K11/11—Spot welding
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Resistance Welding (AREA)
Abstract
The present invention provides a kind of cooling water anti-drop device for mash welder that failure will not be generated the replacement operation of electrode is repeated.The cooling water anti-drop device (1) being connected on mash welder (10) includes that part open at one end is connect with cooling water path (41), and other end center has the cylinder (5) of guide hole (5b).On the direction orthogonal with cylinder center line (C1) of cylinder (5) and it is equipped with piston rod (6a) cylinder (6) flexible along cylinder center line (C1).Partition (5d) and guide rod (5c) are equipped in the inside of cylinder (5), partition (5d) by the inside of cylinder (5) be separated into cooling water path (41) side space (S1) and the side guide hole (5b) space (S2) and will be sealed between the inner peripheral surface of cylinder (5), guide rod (5c) extends on cylinder center line (C1), and slidably contiguously in guide hole (5b), one end is connect with partition (5d) for intercalation.The another side of guide rod (5c) is provided with the bracket (9) for the connection for connecting the other end of guide rod (5c) with the front end of piston rod (6a).
Description
Technical field
The present invention relates to a kind of cooling water anti-drop device, which connect with mash welder, electrode more
It changes in operation when removing electrode from the front end of welding gun, not allowing and be dripped for cooling down the cooling water of electrode from the front end of welding gun.
Background technique
In the past, such as in patent document 1 (JPA2014-14843) front end (shank) of the welding gun in mash welder is disclosed
It is releasably equipped with and contacts the electrode for being pressurizeed and being powered with welding object in welding, if the electrode reaches a high temperature and becomes
Shape then will affect the quality of weld part, therefore usually have by recycling cooling water in electrode interior via welding gun, even if instead
The structure of extreme high heat will not be reached by being subjected to electrode again.
However, above-mentioned electrode its front end face if welding operation is repeated can adhere to oxide film thereon, therefore in order to make to weld
The quality of socket part is stablized, and periodically carries out cutting electrode front end face to remove the operation of oxide film thereon.So, electrode is total
Length can be gradually shortened, it is therefore desirable to the replacement operation of electrode is carried out in the stipulated time.The replacement operation of the electrode passes through will be cold
But the shut-off valve being arranged in water passage is closed after the circulation to stop cooling water, and the electrode of welding gun front end being finished will be mounted on
It removes and new electrode is mounted on welding gun front end and is completed, but in the presence of when removing the electrode being finished from welding gun front end, accumulate
Cooling water in the cooling water path of part from the opening portion of welding gun front end drip and drench operator body or other set
The standby problem waited.
In order to solve this problem, such as known Fig. 5 and shown in fig. 6 cooling water anti-drop device 1A is mounted on mash welder
Scheme on 10A.Above-mentioned cooling water anti-drop device 1A includes cylinder 5A, and the open at one end of cylinder 5A is connected to cooling water path
41A, and other end opening portion is connected to cylinder 6A and is covered by cylinder 6A.The piston rod 6B of cylinder 6A is along cylinder 5A's
Cylinder center line c1 is flexible towards the inside of cylinder 5A.Partition 5B is installed in the front end of piston rod 6B, partition 5B is by cylinder 5A
Inside be separated into the side cooling water path 41A space s1 and the side cylinder 6A space s2 along cylinder center line c1, partition 5B's
Outer peripheral portion is provided with the annular seal body 5C that will be sealed between partition 5B and the inner peripheral surface of cylinder 5A.Moreover, by electrode 3A
When removing from the front end of welding gun 2A, stop the cooling water of cooling unit 4A by the shut-off valve 11A being arranged in cooling water path 41A
Only recycle, and shrink the piston rod 6B in cylinder 6A, thus make the side cooling water path 41A space s1 inside cylinder 5A at
For negative pressure, thus it will not allow cooling water from weldering in the cooling water sucking side the cooling water path 41A space s1 of cooling water path 41A
The opening portion of the front end rifle 2A is dripped.
However, carrying out the replacement behaviour of electrode 3A every time in the case where Fig. 5 and cooling water anti-drop device 1A shown in fig. 6
Device works repeatedly when making, then is mounted on the seal 5C on the partition 5B inside cylinder 5A due to the cunning with cylinder 5A inner peripheral surface
It moves contact action and wears, gradually degrade, therefore air-tightness disappears between partition 5B and cylinder 5A inner peripheral surface, cooling water immerses cylinder
In the side cylinder 6A space s2 inside body 5A, and then it is likely due to immerse cold in the side the cylinder 6A space s2 inside cylinder 5A
But water and so that cylinder 6A is broken down.
Summary of the invention
The present invention is completed in view of the premises, and its purpose is to provide one kind can be in the replacement operation of electrode
Cooling water is reliably prevented to drip from welding gun front end, and will not break down the replacement operation of electrode is repeated
Cooling water anti-drop device for mash welder.
To achieve the goals above, it is a feature of the present invention that make from cooling water path will cooling water sucking inside
Cylinder is separated with fluid air cylinder (fluid pressure cylinder).
Specifically, cooling water anti-drop device is connected on mash welder, which there is front end to be releasably equipped with
The welding gun of electrode makes cooling water via the cooling water path for extending on the welding gun the above-mentioned electrode being arranged and in above-mentioned electrode
Portion's circulation, above-mentioned cooling water anti-drop device are configured to, and when the above-mentioned electrode that the front end of above-mentioned welding gun is installed is removed, set utilizing
In the state that the shut-off valve being placed in above-mentioned cooling water path stops the circulation of the cooling water of above-mentioned electrode interior, it will lodge in
To prevent cooling water from dripping from the front end of above-mentioned welding gun, this is cold for part or all of cooling water sucking in above-mentioned cooling water path
But water anti-drop device uses following solution.
That is, in the invention of first aspect, which is characterized in that cooling water anti-drop device include: it is open at one end with it is above-mentioned cold
But water passage connection and other end center have guide hole cylinder and on the direction orthogonal with the cylinder center line of the cylinder simultaneously
It is located at the more than one fluid air cylinder that on above-mentioned cylinder and piston rod stretches along above-mentioned cylinder center line, in above-mentioned cylinder
Inside is equipped with partition and guide rod, which is separated into cooling water path side space and guide hole side space for the inside of the cylinder,
And it will be sealed between the inner peripheral surface of above-mentioned cylinder, which extends on above-mentioned cylinder center line, and slidably contiguously embedding
It is inserted in above-mentioned guide hole, one end of above-mentioned guide rod is connect with aforementioned barriers, is provided in the another side of the guide rod by the guide rod
The connection bracket that is connect with the front end of above-mentioned piston rod of the other end.
The invention of second aspect is in the invention of first aspect, which is characterized in that above-mentioned cylinder with cylinder center line just
On the direction of friendship and be provided close to the position of above-mentioned cylinder, and be configured to above-mentioned piston rod towards and above-mentioned cooling water path phase
Anti- side is flexible.
The invention of the third aspect is in the invention of second aspect, which is characterized in that above-mentioned cylinder, which is matched, is set as identical type
A pair of of cylinder, a pair of above-mentioned cylinder clipped above-mentioned cylinder and is symmetrical arranged centered on the cylinder, above-mentioned connection bracket be in
The plate that the orthogonal side of above-mentioned cylinder center line upwardly extends, the other end of above-mentioned guide rod are fixed on the length of above-mentioned connection bracket
Direction center portion, the piston rod front end of a pair of above-mentioned cylinder are separately fixed at length direction one end of above-mentioned connection bracket and another
One end.
In the invention of first aspect, even if because working repeatedly for device causes the hermetic unit of the partition of inner barrel bad
Change and the air-tightness between partition and internal circumference surface in barrel is made to disappear, and then leads to the guide hole side space of cooling water immersion inner barrel
It is interior, since fluid air cylinder is separated with cylinder, so cooling water will not immerse cylinder interior.Therefore, can reliably prevent
Only cooling water is dripped from the front end of welding gun in the replacement operation of electrode, and is prevented due to working repeatedly as caused by fluid air cylinder
Plant failure.
In the invention of second aspect, since the positional relationship of cylinder and fluid air cylinder is orthogonal with cylinder center line
Direction on state arrangement close to each other, therefore the compact shape of device can be made.
In the invention of the third aspect, since device is the symmetrical structure centered on guide rod, if two fluid pressures
Cylinder operation then slides guide rod as the crow flies on the cylinder center line of cylinder by linking bracket.It therefore, can steadily will be cold
But water sucks inner barrel, and can reduce the load of the moving part of device, the failure of anti-locking apparatus.
Detailed description of the invention
Fig. 1 is the structural representation for being connected with the mash welder of cooling water anti-drop device involved in embodiments of the present invention
Figure.
Fig. 2 is the perspective view of cooling water anti-drop device involved in embodiments of the present invention.
Fig. 3 is the cross-sectional view of III-III line in Fig. 2.
Fig. 4 corresponds to Fig. 3, shows the state of cooling water sucking inner barrel.
Fig. 5 is the schematic diagram for being connected with the mash welder of existing cooling water anti-drop device.
Fig. 6 is the cross-sectional view of line VI -- VI in Fig. 5.
In figure, 1, cooling water anti-drop device；2, welding gun；3, electrode；5, cylinder, 5b, guide hole；5c, guide rod；5d, partition；6,
Cylinder (fluid air cylinder)；6a, piston rod；9, link bracket；10, mash welder；11, shut-off valve；41, cooling water path；C1, cylinder
Center line；S1, cooling water path side space；S2, guide hole side space.
Specific embodiment
Hereinafter, detailed description of embodiments of the present invention with reference to the accompanying drawings.It should be noted that following preferred embodiment
Explanation it is substantially merely illustrative.
Fig. 1 shows the mash welder 10 for being connected with cooling water anti-drop device 1 involved in embodiments of the present invention.The spot welding
Machine 10 is in approximate for assembling multiple pressed parts (not shown) by spot welding in such as auto production line, including in terms of front
The welding gun 2 of C font.
A pair relative to each other is provided in thin rodlike handle 2a in the front end of the welding gun 2, side handle 2a on welding gun 2
It part can close, separate another handle 2a.
It is releasably equipped in the front end of each handle 2a and is seen from front and hang the electrode 3 of mitriform in approximation, by welding object
In the state that configuration (not shown) is between two electrodes 3, make the part of a side handle 2a on welding gun 2 close to another handle 2a,
It is clipped after welding object pressurizeed, is made current flow through between two electrodes 3, to be carried out to welding object by two electrodes 3
Spot welding.
The cooling unit 4 of cooling above-mentioned two electrode 3 is connected on welding gun 2.
The cooling unit 4 include cell body 40 and cooling water path 41, cell body 40 have make cooling water recycle
It pumps 40a and stores basin (tank) 40b of cooling water, cooling water path 41, which has from the cell body 40, extends to each electrode 3
First pipe 41a and the second pipe 41b of cell body 40 is extended to from each electrode 3, the work that cooling unit 4 passes through pump 40a
Make, keeps the cooling water in basin 40b each to this in the inside of each electrode 3 circulation via first pipe 41a and second pipe 41b
Electrode 3 is cooled down.
As shown in Fig. 2, the middle section of first pipe 41a is arranged in cooling water anti-drop device 1, including cylinder center line C1 exists
Upper and lower upwardly extend in the cylinder 5 of approximate cylinder shape and on the direction orthogonal with the cylinder center line C1 of the cylinder 5 simultaneously
A pair of of the cylinder 6 (fluid air cylinder) being located on cylinder 5.
As shown in figure 3, being formed with the connecting hole 5a being connected to the inside of the cylinder 5, the connection in one end center of cylinder 5
Hole 5a is connect with the T font pipeline 42 of a part for constituting first pipe 41a.
That is, the part open at one end of cylinder 5 is connect with cooling water path 41.
As depicted in figs. 1 and 2, cooling water in cooling water path 41 can be made by being connected in the upstream side of T font pipeline 42
Recycle the shut-off valve 11 stopped.
On the other hand, as shown in figure 3, the other end center in cylinder 5 is formed with the guide hole being connected to the inside of the cylinder 5
5b, slidably contiguously intercalation has the guide rod 5c extended on cylinder center line C1 in guide hole 5b.
It is equipped in the inside of cylinder 5 and the inside of the cylinder 5 is separated into 41 side space S 1 of cooling water path and guide hole 5b
Side space S 2 is in disk-shaped partition 5d, and the central axis of partition 5d is consistent with cylinder center line C1, partition 5d it is central with lead
One end of bar 5c connects.
Rubber system seal 5e, seal 5e annular in shape are installed by partition 5d and cylinder in the outer peripheral portion of partition 5d
It is sealed between the inner peripheral surface of body 5.
Moreover, partition 5d keeps the inner peripheral surface of seal 5e and cylinder 5 sliding if guide rod 5c is slided on cylinder center line C1
Dynamic contact is simultaneously slided along cylinder center line C1, and the spaced-apart locations of the inside of cylinder 5 are changed.
Two cylinders 6 have ability of the same race, are arranged to clip the cylinder 5 on the position close to cylinder 5 respectively and with cylinder
It is symmetrical arranged centered on body 5.
In addition, each cylinder 6 is configured to piston rod 6a towards the side opposite with cooling water path 41 along cylinder center line C1
It is flexible.
As shown in Fig. 2, being respectively arranged with the first supply and discharge portion 6b and second in the length direction two sides of each 6 body part of cylinder
Supply and discharge portion 6c, first supply and discharge portion 6b and the second supply and discharge portion 6c, which become, to be supplied compressed air into each cylinder 6 and will compress empty
Gas is from the part that each cylinder 6 is discharged.
If via the first air pipeline 7a being connect with each first supply and discharge portion 6b to supplying compressed air inside cylinder 6,
And air is discharged inside cylinder 6 via the second air pipeline 7b connecting with each second supply and discharge portion 6c, then piston rod 6a stretches
It is long.On the other hand, if it is empty to supply compression inside cylinder 6 via the second air pipeline 7b being connect with each second supply and discharge portion 6c
Gas, and air is discharged inside cylinder 6 via the first air pipeline 7a connecting with each first supply and discharge portion 6b, then piston rod 6a
It shrinks.
As shown in figure 3, be equipped in cylinder 5 in the side opposite with cooling water path 41 of cylinder 5 and two cylinders 6 and
The fixed plate 8 for the plate that two cylinders 6 and the side set upwardly extend.
Cylinder 5 is fixed on the length direction central portion point of the fixed plate 8, and each cylinder 6 is separately fixed at the length of fixed plate 8
Direction both sides are spent, are thus integrally formed cylinder 5 and two cylinders 6.
The first embedded hole 8a is formed in the length direction middle thereof of fixed plate 8.It is fitted into first embedded hole 8a
Have the first guide sleeve (guide bush) 8b, guide rod 5c slideably intercalation in first guide sleeve 8b.
On the other hand, it is formed through the second embedded hole 8c respectively in the length direction two sides of fixed plate 8.It is second embedding at this
Close hole 8c in respectively be fitted into have the second guide sleeve 8d, the piston rod 6a of each cylinder 6 slideably intercalation in each second guide sleeve 8d.
The side opposite with cylinder 5 and each cylinder 6 of fixed plate 8 is provided with the connection bracket of a plate
(connection bracket) 9, the connection bracket 9 is parallel relative to fixed plate 8 on the orthogonal direction cylinder center line C1
Extend, separates specified interval setting from fixed plate 8.
The length direction central portion that the other end of guide rod 5c is fixed on connection bracket 9 is divided, and the piston rod 6a of each cylinder 6
Front end is separately fixed at length direction one end and the other end of connection bracket 9.
That is, connection bracket 9 is connected with the front end of the other end of guide rod 5c and each piston rod 6a.
Moreover, in each electrode 3 for the front end (each handle 2a) that replacement is installed on welding gun 2 by each electrode 3 before welding gun 2
When end removes, if stopping circulation of the cooling water in each electrode 3 using shut-off valve 11, and via the first air pipeline
7a is to supply compressed air inside each cylinder 6 and air is discharged inside cylinder 6 via the second air pipeline 7b and makes each piston
Bar 6a elongation, then as shown in figure 4, guide rod 5c and partition 5d slide off cooling water path 41.Cooling water path is accumulated in as a result,
Part or all of cooling water in 41 is inhaled into the inside of cylinder 5, therefore even if removing from the front end of welding gun 2 by each electrode 3,
Also it can prevent cooling water from dripping from the front end of welding gun 2.
On the other hand, after new electrode 3 being installed in the front end of welding gun 2, if via the second air pipeline 7b to each gas
Compressed air is supplied inside cylinder 6 and air is discharged inside cylinder 6 via the first air pipeline 7a and shrinks each piston rod 6a,
Then as shown in figure 3, guide rod 5c and partition 5d, which is slided, returns to original position close to cooling water path 41, then, if releasing shut-off valve
The stopping of 11 pairs of cooling waters circulation then becomes the state that spot welding can be carried out by mash welder 10.
In conclusion embodiment according to the present invention, even if because working repeatedly for cooling water anti-drop device 1 leads to cylinder
The seal 5e of partition 5d inside 5 is deteriorated and the air-tightness between partition 5d and the inner peripheral surface of cylinder 5 is made to disappear, and then is caused
Cooling water immerses in the side the guide hole 5b space S 2 inside cylinder 5, since cylinder 6 and cylinder 5 separate, so cooling water will not
It immerses inside cylinder 6.Therefore, cooling water in the replacement operation of electrode 3 is reliably prevented to drip from the front end of welding gun 2, and
It prevents because working repeatedly due to the failure of the cooling water anti-drop device 1 as caused by cylinder 6.
In addition, since the positional relationship of cylinder 5 and cylinder 6 is with close to each other on the direction orthogonal with cylinder center line C1
State arrangement, therefore the compact shape of cooling water anti-drop device 1 can be made.
In turn, due to the symmetrical structure that cooling water anti-drop device 1 is centered on guide rod 5c, if two 6 works of cylinder
Make, then slides guide rod 5c as the crow flies on the cylinder center line C1 of cylinder 5 by linking bracket 9.It therefore, can steadily will be cold
But the inside of water sucking cylinder 5, and the load of the moving part of cooling water anti-drop device 1 can be reduced, prevent cooling water anti-fall
The failure of device 1.
It should be noted that in embodiments of the present invention, the two sides of cylinder 5 be provided with a pair of of cylinder 6 but it is also possible to be
The structure of one cylinder 6 is only set in the side of cylinder 5, can also be and three knots with upper cylinder 6 are set in the side of cylinder 5
Structure.
In addition, in embodiments of the present invention, each cylinder 6 is simultaneously provided close to the position of cylinder 5 but it is also possible to be will be each
Cylinder 6 is located off the structure of the position of cylinder 5.
In addition, in embodiments of the present invention, each cylinder 6 is symmetrical arranged centered on the guide rod 5c of cylinder 5, but each gas
The position of cylinder 6 can also be asymmetricly arranged centered on the guide rod 5c of cylinder 5.
In addition, in embodiments of the present invention, using cylinder 6 as fluid air cylinder, but oil pressure gas also can be used
Cylinder is as fluid air cylinder.
Industrial availability-
The present invention is suitable for cooling water anti-drop device, which is connected on mash welder, electrode more
It changes in operation when removing electrode from the front end of welding gun, not allowing and be dripped for cooling down the cooling water of electrode from the front end of welding gun.
Claims (3)
1. a kind of cooling water anti-drop device, is connected on mash welder, there is the mash welder front end to be releasably equipped with electricity
The welding gun of pole makes cooling water via the cooling water path for extending on the welding gun electrode being arranged and in the electrode interior
Circulation, the cooling water anti-drop device are configured to, and when the electrode that the front end of the welding gun is installed is removed, are utilizing setting
In the state that shut-off valve in the cooling water path stops the circulation of the cooling water of the electrode interior, by lodging in
Part or all of cooling water sucking in cooling water path is stated to prevent cooling water from the front end of welding gun drippage, feature
It is,
The cooling water anti-drop device includes: open at one end connect with the cooling water path and other end center has guide hole
It cylinder and on the direction orthogonal with the cylinder center line of the cylinder and is located on the cylinder and piston rod is along in the cylinder
The flexible more than one fluid air cylinder of heart line,
It is equipped with partition and guide rod in the inside of the cylinder, the inside of the cylinder is separated into cooling water path side by the partition
Space and guide hole side space, and will be sealed between the inner peripheral surface of the cylinder, the guide rod extends on the cylinder center line,
And slidably contiguously in the guide hole, one end of the guide rod is connect with the partition for intercalation,
The connection branch for connecting the other end of the guide rod with the front end of the piston rod is provided in the another side of the guide rod
Frame.
2. cooling water anti-drop device according to claim 1, which is characterized in that
The cylinder is on the direction orthogonal with the cylinder center line and is provided close to the position of the cylinder, and is configured to institute
It is flexible towards the side opposite with the cooling water path to state piston rod.
3. cooling water anti-drop device according to claim 2, which is characterized in that
The cylinder matches a pair of of the cylinder for being set as identical type, and it is right centered on the cylinder that a pair of cylinder clips the cylinder
Claim setting,
The connection bracket is in the plate upwardly extended in the side orthogonal with the cylinder center line, and the other end of the guide rod is solid
It is scheduled on the length direction central portion point of the connection bracket, the piston rod front end of a pair of cylinder is separately fixed at the connection
Length direction one end of bracket and the other end.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811300702.6A CN109262126B (en) | 2018-11-02 | 2018-11-02 | Cooling water anti-falling device |
| PCT/CN2019/093457 WO2020087959A1 (en) | 2018-11-02 | 2019-06-28 | Device for preventing cooling water from dripping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811300702.6A CN109262126B (en) | 2018-11-02 | 2018-11-02 | Cooling water anti-falling device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109262126A true CN109262126A (en) | 2019-01-25 |
| CN109262126B CN109262126B (en) | 2022-08-02 |
Family
ID=65192029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811300702.6A Active CN109262126B (en) | 2018-11-02 | 2018-11-02 | Cooling water anti-falling device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109262126B (en) |
| WO (1) | WO2020087959A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020087959A1 (en) * | 2018-11-02 | 2020-05-07 | 广州市极动焊接机械有限公司 | Device for preventing cooling water from dripping |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2022111624A (en) | 2021-01-20 | 2022-08-01 | 株式会社キョクトー | Cooling water dropping prevention system |
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2019
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109262126B (en) | 2022-08-02 |
| WO2020087959A1 (en) | 2020-05-07 |
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