CN110504141A - The production method of EV fuse - Google Patents
The production method of EV fuse Download PDFInfo
- Publication number
- CN110504141A CN110504141A CN201910778525.0A CN201910778525A CN110504141A CN 110504141 A CN110504141 A CN 110504141A CN 201910778525 A CN201910778525 A CN 201910778525A CN 110504141 A CN110504141 A CN 110504141A
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- Prior art keywords
- parts
- sand
- quartz sand
- solidification
- fuse
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- 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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H69/00—Apparatus or processes for the manufacture of emergency protective devices
- H01H69/02—Manufacture of fuses
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
- H01H85/05—Component parts thereof
- H01H85/18—Casing fillings, e.g. powder
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
- H01H85/05—Component parts thereof
- H01H85/18—Casing fillings, e.g. powder
- H01H85/185—Insulating members for supporting fusible elements inside a casing, e.g. for helically wound fusible elements
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The present invention relates to a kind of production methods of EV fuse, the production method of the EV fuse is the following steps are included: raw material is mixed evenly to obtain solidification sand, it is described to solidify each component that sand includes following mass parts: 95 parts to 99 parts of quartz sand of mixing, 0.5 to 1 part of curing agent and 0.5 part to 2 parts of water, wherein, the mixing quartz sand includes each component of following mass parts: 70 35 parts to 45 parts of mesh quartz sands, 20 parts to 30 parts of 60 mesh quartz sand, 20 parts to 30 parts of 50 mesh quartz sand, 5 parts to 15 parts of 40 mesh quartz sand；Curing process is carried out to the solidification sand, the solidification sand is placed in fuse shell, the fuse shell is placed into curing apparatus, high-temperature vapor is added into the fuse shell under the pressure of 0.05bar to 0.15bar in the curing apparatus.
Description
Technical field
The present invention relates to EV fuse manufacturing fields, more particularly to a kind of production method of EV fuse.
Background technique
Fuse is widely used in low-voltage distribution system and control system and electrical equipment, as short circuit and over current protection
Shield is using one of most common protection device.Fuse mainly by two parts of melt and fusion tube and it is outer it is filled etc. form,
Fuse is connected in protected circuit during the work time.When being more than one section of specified value by the electric current of protection circuit
Between after, by melt itself generate heat fuse melt, disconnect circuit, thus play the role of protect circuit.When overload electricity
Hour is flowed, fusing time is long, and when overload current is big, fusing time is short.It is normal to current reverts within the scope of overload current, it melts
Disconnected device will not fuse, and can continue to use.Melt is the key element for controlling operating chacteristics.
However, fuse protects the stability of circuit to be continuously improved, and fuse is applied as fuse constantly develops
In various environment and occasion.But often shock resistance is poor for traditional fuse, in the environment of vibration
Working performance is low, is not able to satisfy the high performance requirements under particular surroundings to fuse.
Summary of the invention
Based on this, it is necessary to for the technical problem that traditional fuse shock resistance is poor, provide a kind of EV fusing
The production method of device.
A kind of production method of EV fuse, the production method of the EV fuse the following steps are included:
Raw material is mixed evenly to obtain solidification sand, it is described to solidify each component that sand includes following mass parts: mixing quartz sand
95 parts to 99 parts, 0.5 to 1 part of curing agent and 0.5 part to 2 parts of water, wherein the mixing quartz sand includes following mass parts
Each component: 70 35 parts to 45 parts of mesh quartz sands, 20 parts to 30 parts of 60 mesh quartz sand, 20 parts to 30 parts of 50 mesh quartz sand, 40 mesh stones
5 parts to 15 parts of sand；
Curing process is carried out to the solidification sand, the solidification sand is placed in fuse shell, by the fuse shell
It is placed into curing apparatus, the curing apparatus is added under the pressure of 0.05bar to 0.15bar into the fuse shell
High-temperature vapor.
In one of the embodiments, in the step of carrying out curing process to the solidification sand, the curing apparatus exists
High-temperature vapor is added into the fuse shell under the pressure of 0.08bar to 0.12bar.
In one of the embodiments, in the step of carrying out curing process to the solidification sand, the curing apparatus exists
High-temperature vapor is added into the fuse shell under the pressure of 0.1bar.
The curing agent includes sodium metasilicate and potassium silicate in one of the embodiments,.
The mixing quartz sand includes each component of following mass parts: 70 mesh quartz sands 37 in one of the embodiments,
Part to 42 parts, 22 parts to 28 parts of 60 mesh quartz sand, 22 parts to 28 parts of 50 mesh quartz sand, 8 parts to 12 parts of 40 mesh quartz sand.
The mixing quartz sand includes each component of following mass parts: 70 mesh quartz sands 40 in one of the embodiments,
Part, 25 parts of 60 mesh quartz sand, 25 parts of 50 mesh quartz sand, 10 parts of 40 mesh quartz sand.
In one of the embodiments, in raw material to be mixed evenly to the step of obtaining solidification sand, by mass parts
Each component: 95 parts to 99 parts of quartz sand of mixing, 0.5 part to 1 part of curing agent and 0.5 part to 2 parts of water are 60 degrees Celsius in temperature
It is mixed under to 70 degrees Celsius and obtains within 1.5 hours to 3 hours solidification sand.
In one of the embodiments, in raw material to be mixed evenly to the step of obtaining solidification sand, by mass parts
Each component: 95 parts to 99 parts of quartz sand of mixing, 0.5 part to 1 part of curing agent and 0.5 part to 2 parts of water are 62 degrees Celsius in temperature
It is mixed under to 68 degrees Celsius and obtains within 1.5 hours to 3 hours solidification sand.
In one of the embodiments, in raw material to be mixed evenly to the step of obtaining solidification sand, by mass parts
Each component: 95 parts to 99 parts of quartz sand of mixing, 0.5 part to 1 part of curing agent and 0.5 part to 2 parts of water are 65 degrees Celsius in temperature
Lower be mixed obtains solidification sand for 2 hours.
In one of the embodiments, in the step of carrying out curing process to the solidification sand, the solidification sand is existed
It is reacted 4 hours to 5 hours in the curing apparatus.
In the production method of above-mentioned EV fuse, the biggish quartz sand accounting of particle is greater than in the various quartz sands that use
The accounting of the biggish quartz sand of particle in conventional method reduces the tiny quartz sand accounting of particle.The biggish quartz sand of particle
Between gap it is larger, increase the contact area of quartz sand and vapor and curing agent, be conducive to quartz sand and vapor
And the abundant reaction of curing agent.The solidification effect for solidifying sand is significantly improved, so that the anti-shake performance of EV fuse mentions
It is high.It avoids the tiny quartz sand of particle and is detached from melt during vibration to causing to wear inside EV fuse, to improve
The service life of EV fuse.In addition, the EV fuse that the production method of above-mentioned EV fuse obtains is better than arc extinguishing effect
EV fuse greatly improves the breaking capacity of EV fuse.
Detailed description of the invention
Fig. 1 is the flow diagram of the production method of EV fuse in one embodiment.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the present invention, not
For limiting the present invention.
Referring to Fig. 1, the present invention provides a kind of production method of EV fuse, wrapped in the production method of the EV fuse
Include following steps:
Step 101: raw material being mixed evenly to obtain solidification sand.
Specifically, solidifying each component that sand includes following mass parts: 95 parts of quartz sand of mixing to 99 parts, curing agent 0.5 to 1
Part and 0.5 part to 2 parts of water.Wherein, mixing quartz sand includes each component of following mass parts: 70 35 parts to 45 of mesh quartz sands
Part, 20 parts to 30 parts of 60 mesh quartz sand, 20 parts to 30 parts of 50 mesh quartz sand, 5 parts to 15 parts of 40 mesh quartz sand.
Wherein, quartz sand is quartz through the broken quartz particles being process, and is a kind of hard, wear-resisting, chemical property
Stable silicate mineral, the main mineral constituent of quartz sand are SiO2.In the present embodiment, the curing agent includes sodium metasilicate
And potassium silicate.Further, the main component of the curing agent is sodium metasilicate.Sodium metasilicate is also known as sodium silicate, is a kind of water solubility
Silicate.Sodium metasilicate reacts the aqueous solution to be formed with water waterglass, is a kind of mine binder.It is when potassium silicate stable state
Bright matter viscous liquid.Solidifying the water for including in sand is pure water.
The water and curing agent solidified in sand reacts to form adhesive, and the quartz sand of variable grain size is bonded in by adhesive
It is formed together block-like solidification sand.It should be noted that traditional solidifies the lesser stone of particle in the mixing quartz sand that sand includes
Sand accounting is larger, and mixes in quartz sand comprising the smaller quartz sand of particle.However, between the lesser quartz sand of particle
Gap is smaller, causes the contact area of quartz sand and vapor and curing agent small, is unfavorable for quartz sand and vapor and consolidates
The abundant reaction of agent, to influence to solidify the solidification effect of sand.The biggish stone of particle in the solidification sand obtained by step 101
Sand accounting is greater than the accounting of the biggish quartz sand of particle in conventional method, and the gap between the biggish quartz sand of particle is larger,
The contact area of quartz sand and vapor and curing agent is increased, the abundant of quartz sand and vapor and curing agent is conducive to
Reaction.The solidification effect for solidifying sand is significantly improved, so that the anti-shake performance of EV fuse improves.
Step 102: curing process is carried out to the solidification sand.
Specifically, solidification sand is placed in fuse shell, fuse shell is placed into curing apparatus, solidification is set
It is standby that high-temperature vapor is added into fuse shell under the pressure of 0.05bar to 0.15bar, EV is obtained in fuse shell
Fuse.
Wherein, fuse shell refers to the shell for the EV fuse for being contained with melt, it can be understood as, fuse shell
It is the absence of the EV fuse for solidifying sand.Solidification sand is placed in fuse shell, so that the solidification sand solidification that reaction obtains
It takes shape in fuse shell, so that the shape size demand for solidifying sand and being adapted to EV fuse that reaction obtains.Gu
Changing equipment is a container, and fuse shell is placed in curing apparatus.Curing apparatus completes solidification for solidification sand and provides place.
High-temperature vapor, high-temperature water is added in curing apparatus under the pressure of 0.05bar to 0.15bar into fuse shell
Steam is passed through in fuse shell.On the one hand the temperature in curing apparatus is improved, for the curing reaction for solidifying sand and vapor
Create temperature condition.On the other hand, high-temperature vapor is convenient for reacting generation solid state with the sand that solidifies in fuse shell
EV fuse solidification sand.The sand that solidifies in fuse shell condenses integrally under the action of the vapor of high temperature and pressure, complete
At being formed by curing the EV fuse of solid state with solidification sand and be joined together to form EV fuse with fuse shell.It needs
Illustrate, the minimum temperature of vapor is 100 degrees Celsius, that is to say, that the temperature in curing apparatus is Celsius not less than 100
Degree.
In the production method of above-mentioned EV fuse, the biggish quartz sand accounting of particle is greater than in the various quartz sands that use
The accounting of the biggish quartz sand of particle in conventional method reduces the tiny quartz sand accounting of particle.The biggish quartz sand of particle
Between gap it is larger, increase the contact area of quartz sand and vapor and curing agent, be conducive to quartz sand and vapor
And the abundant reaction of curing agent.The solidification effect for solidifying sand is significantly improved, so that the anti-shake performance of EV fuse mentions
It is high.It avoids the tiny quartz sand of particle and is detached from melt during vibration to causing to wear inside EV fuse, to improve
The service life of EV fuse.In addition, the EV fuse that the production method of above-mentioned EV fuse obtains is better than arc extinguishing effect
Conventional melt greatly improves the breaking capacity of EV fuse.
Solidify solidification effect of the sand in curing apparatus in fuse shell to just improve, wherein one embodiment
In, to it is described solidify sand carry out curing process step 101 in, curing apparatus under the pressure of 0.08bar to 0.12bar to
High-temperature vapor is added in fuse shell.In another embodiment, to the step for solidifying sand and carrying out curing process
In rapid 101, high-temperature vapor is added into fuse shell under the pressure of 0.1bar in curing apparatus.It should be noted that In
High-temperature vapor is added under the pressure of 0.1bar into fuse shell, on the one hand can guarantee vapor can as much as possible into
Enter into fuse shell with solidification sand contact, specifically, it is ensured that vapor can as much as possible with solidify the stone in sand
Sand contact.Improve the solidification effect for solidifying sand in fuse shell.On the other hand, the vapor of moderate pressure will not will melt
Solidification sand in disconnected device shell is squeezed and deformed, to avoid the structural stability for influencing EV fuse.Further, to described solid
Change sand to carry out in the step 101 of curing process, solidification sand is reacted 4 hours to 5 hours in curing apparatus.Particularly, will consolidate
Change sand to react in curing apparatus 40 minutes 4 hours.Solidification sand is reacted 4 hours to 5 hours in curing apparatus and can be made
Solidification sand in fuse shell comes into full contact with high-temperature high-pressure steam, ensure that solidification sand in fuse shell have compared with
Good solidification effect.In this way, curing apparatus can preferably to solidify sand completion solidification in fuse shell, to improve fusing
The solidification effect for solidifying sand in device shell.
In order to improve the reaction effect of mixing quartz sand and curing agent and water, stone is mixed in one of the embodiments,
Sand includes each component of following mass parts: 70 37 parts to 42 parts of mesh quartz sands, 22 parts to 28 parts of 60 mesh quartz sand, 50 mesh quartz
22 parts to 28 parts of sand, 8 parts to 12 parts of 40 mesh quartz sand.In another embodiment, mixing quartz sand includes following mass parts
Each component: 70 40 parts of mesh quartz sands, 25 parts of 60 mesh quartz sand, 25 parts of 50 mesh quartz sand, 10 parts of 40 mesh quartz sand.It needs to illustrate
It is to increase the biggish quartz sand accounting of particle in mixing quartz sand.However, gap between the biggish quartz sand of particle compared with
Greatly, the contact area of quartz sand and vapor and curing agent is increased, quartz sand and vapor and curing agent are conducive to
Sufficiently reaction.The solidification effect of quartz sand is significantly improved, so that the anti-shake performance of EV fuse improves.Avoid particle
Tiny quartz sand is detached from melt to causing to wear inside EV fuse, to improve making for EV fuse during vibration
Use the service life.In addition, the melt that the mixing quartz sand for increasing bulky grain quartz sand accounting reacts is better than passing to arc extinguishing effect
System melt, greatly improves the breaking capacity of EV fuse.In this way, increasing the mixing quartz sand of bulky grain quartz sand accounting
Improve the reaction effect of mixing quartz sand and curing agent and water.
In order to improve the effect of raw material mixing so as to improve the quality for solidifying sand, In in one of the embodiments,
Raw material is mixed evenly to obtain in the step 101 for solidifying sand, by each component of mass parts: mixing 95 parts to 99 of quartz sand
It is small that part, 0.5 part to 1 part of curing agent and 0.5 part to 2 parts of water are mixed 1.5 under being 60 degrees Celsius to 70 degrees Celsius in temperature
Solidification sand was obtained up to 3 hours.The step of obtaining solidification sand is being mixed evenly in raw material in one of the embodiments,
In 101, by each component of mass parts: mixing 95 parts to 99 parts of quartz sand, 0.5 part to 1 part and 0.5 part to 2 parts of water of curing agent
It is mixed under being 62 degrees Celsius to 68 degrees Celsius in temperature and obtains within 1.5 hours to 3 hours solidification sand.One embodiment wherein
In, raw material is being mixed evenly to obtain in the step 101 for solidifying sand, by each component of mass parts: mixing 95 parts of quartz sand
It is mixed 2 hours and is consolidated under being 65 degrees Celsius in temperature to 99 parts, 0.5 part to 1 part of curing agent and 0.5 part to 2 parts of water
Change sand.It should be noted that the effect that quartz sand will be mixed, curing agent and water are mixed under 60 degrees Celsius to 70 degrees Celsius
Fruit is good, on the one hand, is conducive to mixing quartz sand and comes into full contact with curing agent, water.On the other hand, it avoids curing agent and water is anti-
The adhesive that should be formed is excessively sticky under the lower environment of temperature, imitates to influence adhesive with the mixing for mixing quartz sand
Fruit.Further, raw material is being mixed evenly to obtain in the step 101 for solidifying sand, by each component of mass parts: mixing stone
97 parts to 99 parts of sand, 0.7 part to 0.9 part of curing agent and 0.8 part to 1.5 parts of water are mixed under being 65 degrees Celsius in temperature
Obtain within 2 hours solidification sand.Particularly, raw material is being mixed evenly to obtain in the step 101 for solidifying sand, by each of mass parts
Component: 98.2 parts of quartz sand of mixing, 08 part of curing agent and 1 part of water are mixed 2 hours under being 65 degrees Celsius in temperature and obtain
Solidify sand.The solidification sand hardness that mixing quartz sand, curing agent and water are obtained according to such ratio hybrid reaction is moderate, is convenient for
The solidifying and setting working process of cured later sand.
Each technical characteristic of above embodiments can be combined arbitrarily, for simplicity of description, not to above-described embodiment
In each technical characteristic it is all possible combination be all described, as long as however, the combination of these technical characteristics be not present lance
Shield all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of production method of EV fuse, which is characterized in that the described method comprises the following steps:
Raw material is mixed evenly to obtain solidification sand, it is described to solidify each component that sand includes following mass parts: mixing quartz sand
95 parts to 99 parts, 0.5 to 1 part of curing agent and 0.5 part to 2 parts of water, wherein the mixing quartz sand includes following mass parts
Each component: 70 35 parts to 45 parts of mesh quartz sands, 20 parts to 30 parts of 60 mesh quartz sand, 20 parts to 30 parts of 50 mesh quartz sand, 40 mesh stones
5 parts to 15 parts of sand；
Curing process is carried out to the solidification sand, the solidification sand is placed in fuse shell, by the fuse shell
It is placed into curing apparatus, the curing apparatus is added under the pressure of 0.05bar to 0.15bar into the fuse shell
High-temperature vapor.
2. the method according to claim 1, wherein to the solidification sand carry out curing process the step of in,
High-temperature vapor is added into the fuse shell under the pressure of 0.08bar to 0.12bar in the curing apparatus.
3. the method according to claim 1, wherein to the solidification sand carry out curing process the step of in,
High-temperature vapor is added into the fuse shell under the pressure of 0.1bar in the curing apparatus.
4. the method according to claim 1, wherein the curing agent includes sodium metasilicate and potassium silicate.
5. the method according to claim 1, wherein the mixing quartz sand includes each group of following mass parts
Point: 70 37 parts to 42 parts of mesh quartz sands, 22 parts to 28 parts of 60 mesh quartz sand, 22 parts to 28 parts of 50 mesh quartz sand, 40 mesh quartz sands 8
Part is to 12 parts.
6. the method according to claim 1, wherein the mixing quartz sand includes each group of following mass parts
Point: 70 40 parts of mesh quartz sands, 25 parts of 60 mesh quartz sand, 25 parts of 50 mesh quartz sand, 10 parts of 40 mesh quartz sand.
7. the method according to claim 1, wherein the step of obtaining solidification sand is mixed evenly in raw material
In, by each component of mass parts: 95 parts to 99 parts of quartz sand of mixing, 0.5 part to 1 part of curing agent and 0.5 part to 2 parts of water are in temperature
Degree is to be mixed to obtain within 1.5 hours to 3 hours solidification sand under 60 degrees Celsius to 70 degrees Celsius.
8. the method according to claim 1, wherein the step of obtaining solidification sand is mixed evenly in raw material
In, by each component of mass parts: 95 parts to 99 parts of quartz sand of mixing, 0.5 part to 1 part of curing agent and 0.5 part to 2 parts of water are in temperature
Degree is to be mixed to obtain within 1.5 hours to 3 hours solidification sand under 62 degrees Celsius to 68 degrees Celsius.
9. the method according to claim 1, wherein the step of obtaining solidification sand is mixed evenly in raw material
In, by each component of mass parts: 95 parts to 99 parts of quartz sand of mixing, 0.5 part to 1 part of curing agent and 0.5 part to 2 parts of water are in temperature
Degree is to be mixed to obtain within 2 hours solidification sand under 65 degrees Celsius.
10. the method according to claim 1, wherein to the solidification sand carry out curing process the step of in,
The solidification sand is reacted 4 hours to 5 hours in the curing apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910778525.0A CN110504141B (en) | 2019-08-22 | 2019-08-22 | Manufacturing method of EV fuse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910778525.0A CN110504141B (en) | 2019-08-22 | 2019-08-22 | Manufacturing method of EV fuse |
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| CN110504141A true CN110504141A (en) | 2019-11-26 |
| CN110504141B CN110504141B (en) | 2021-06-18 |
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| CN201910778525.0A Active CN110504141B (en) | 2019-08-22 | 2019-08-22 | Manufacturing method of EV fuse |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013258013A (en) * | 2012-06-12 | 2013-12-26 | Murata Mfg Co Ltd | Fuse |
| CN104319193A (en) * | 2014-10-17 | 2015-01-28 | 东莞市博钺电子有限公司 | High-speed fuse production process |
| CN105679622A (en) * | 2016-02-26 | 2016-06-15 | 广东中贝能源科技有限公司 | Quartz sand fuse and fabrication method thereof |
| CN105884292A (en) * | 2015-01-06 | 2016-08-24 | 奥恒科技（西安）有限公司 | New method for curing fuse quartz sand |
| CN109734409A (en) * | 2019-03-08 | 2019-05-10 | 上海电器陶瓷厂有限公司 | The curing method of quartz sand in a kind of low-voltage fuse body |
-
2019
- 2019-08-22 CN CN201910778525.0A patent/CN110504141B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013258013A (en) * | 2012-06-12 | 2013-12-26 | Murata Mfg Co Ltd | Fuse |
| CN104319193A (en) * | 2014-10-17 | 2015-01-28 | 东莞市博钺电子有限公司 | High-speed fuse production process |
| CN105884292A (en) * | 2015-01-06 | 2016-08-24 | 奥恒科技（西安）有限公司 | New method for curing fuse quartz sand |
| CN105679622A (en) * | 2016-02-26 | 2016-06-15 | 广东中贝能源科技有限公司 | Quartz sand fuse and fabrication method thereof |
| CN109734409A (en) * | 2019-03-08 | 2019-05-10 | 上海电器陶瓷厂有限公司 | The curing method of quartz sand in a kind of low-voltage fuse body |
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| CN110504141B (en) | 2021-06-18 |
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