EP3462118A1 - Système de porte destiné à l'ouverture et à la fermeture d'une ouverture du récipient d'un four - Google Patents

Système de porte destiné à l'ouverture et à la fermeture d'une ouverture du récipient d'un four Download PDF

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Publication number
EP3462118A1
EP3462118A1 EP17193655.2A EP17193655A EP3462118A1 EP 3462118 A1 EP3462118 A1 EP 3462118A1 EP 17193655 A EP17193655 A EP 17193655A EP 3462118 A1 EP3462118 A1 EP 3462118A1
Authority
EP
European Patent Office
Prior art keywords
door
container
joint
rotation axis
joints
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.)
Withdrawn
Application number
EP17193655.2A
Other languages
German (de)
English (en)
Inventor
Max Schmitt
Raphael ORLIK
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Strikowestofen GmbH
Original Assignee
Strikowestofen GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Strikowestofen GmbH filed Critical Strikowestofen GmbH
Priority to EP17193655.2A priority Critical patent/EP3462118A1/fr
Priority to PCT/EP2018/076179 priority patent/WO2019063643A1/fr
Priority to ES18772838T priority patent/ES2893158T3/es
Priority to EP18772838.1A priority patent/EP3688395B1/fr
Priority to CN201880063464.3A priority patent/CN111480047B/zh
Priority to PL18772838T priority patent/PL3688395T3/pl
Priority to MX2020004820A priority patent/MX2020004820A/es
Priority to DK18772838.1T priority patent/DK3688395T3/da
Publication of EP3462118A1 publication Critical patent/EP3462118A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/18—Door frames; Doors, lids, removable covers
    • F27D1/1858—Doors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/18—Door frames; Doors, lids, removable covers
    • F27D1/1808—Removable covers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/18—Door frames; Doors, lids, removable covers
    • F27D1/1808—Removable covers
    • F27D2001/1825—Means for moving the cover

Definitions

  • the invention relates to an oven, in particular a melting and / or holding furnace for melting and / or keeping warm metal, with a door system for opening and closing a container opening.
  • Industrial furnaces for example melting furnaces
  • containers with container openings in order to ensure access to the interior of the oven, for example for cleaning a melting chamber.
  • Door systems are known from the prior art, with which industrial furnaces are provided to open and close these container openings. It is necessary that the door systems achieve a good sealing effect and the container opening can be closed as gap-free, for example, to ensure an efficiency of the furnace, a melt quality and to prevent heat escaping through the container opening from the oven.
  • Such furnace door systems are often exposed to high heat exposure during operation of the furnace.
  • the hot melt inside the furnace may cause furnace door deformation and / or deformation on a door abutment surface surrounding the container opening.
  • solidifying melt, for example liquid metal, or particles in the region of the container opening can lead to soiling and unevenness in the sealing area between the oven door and the oven.
  • These deformations and soiling can result in a sealing surface of the oven door no longer sealing against a door contact surface and causing gaps between the oven and the closed door.
  • the width of the resulting column can be several centimeters and the gaps can, depending on a prevailing pressure in the furnace, allow an undesired suction of ambient air or an undesirable ejection of the furnace atmosphere. This can reduce the efficiency of the process taking place in the furnace, for example a melting process, since it may be necessary to operate an increased energy expenditure for heating the furnace interior.
  • the furnace according to the invention in particular a melting and / or holding furnace for melting and / or keeping metal warm, comprises a container having an opening, for example for receiving a melt and at least one door for closing and opening the opening.
  • the furnace comprises a melting chamber in which metal can be melted and / or a holding chamber, in which the melt can be heated to a procedurally necessary temperature and / or maintained at this temperature.
  • the oven includes at least one door having at least two first door-side hinges fixedly disposed relative to the door and defining, for example, a first door-side rotation axis.
  • the furnace has at least one, preferably exactly one, second door-side joint, which is fixed relative to the door.
  • the at least one second door-side joint or the exactly one second door-side joint can be arranged at a distance from a straight line defined by the first door-side joints on the door.
  • the oven further comprises a first coupling device movably connecting the door to the container via the first door-side hinges, and a second coupling device movably connecting the door to the container via the at least one, preferably via the exact second, door-side hinge.
  • Such a three-point bearing can have the advantage that the storage of the door is statically determined in a closed position.
  • the furnace may further comprise at least a first container-side hinge fixedly disposed relative to the container and at least one second container-side hinge fixedly disposed relative to the container.
  • the first coupling device has at least one first coupling arm, each rigidly connecting at least one of the first door-side hinges to at least one of the at least one first container-side hinge.
  • the second coupling device may have at least one second coupling arm which rigidly connects the at least one, preferably the exactly one second, door-side joint to the at least one second container-side joint.
  • the at least one second door-side joint preferably the exactly one second door-side joint, can define a second door-side rotation axis or a pivot point.
  • the at least one first container-side joint can define a first container-side axis of rotation.
  • the at least one second container-side joint usually defines a second container-side axis of rotation.
  • the first door-side joints, the at least one second door-side joint-preferably the second door-side joint-the at least one first container-side joint and the at least one second container-side joint can be arranged and configured such that the first door-side axis of rotation, the first container-side Rotary axis, and the second container-side axis of rotation are aligned substantially in pairs parallel to each other, for. B.
  • the second door-side rotation axis is aligned parallel to the said axes of rotation.
  • a deviation from the parallelism can be at most 10 °, preferably at most 8 °, particularly preferably at most 5 °.
  • the coupling arms can be designed with rigid lengths and swing on the container.
  • the coupling arms may further be hinged to the door, so that the door can be pivoted by a swinging motion. In this way, the door can close or open the container opening.
  • the at least one second door-side joint - preferably the exactly one second door-side joint - may be formed as a ball joint.
  • This can be advantageous, since the door can be stored statically indefinitely in an open state and is determined statically only by a concern to the container in the closed state. Thus, the door can tumble in an open state by at least one indefinite degree of freedom and the position of the door can adapt to container-side deformations. Thus, the door in the closed state can lie substantially sealingly against the container.
  • the coupling arms can be levers or beams or also have a different shape. Regardless of the form, the coupling arms should have one establish rigid connection between the respective container side and door side joints.
  • the first coupling device and the second coupling device may be configured such that a first distance between the first door-side rotation axis and the first container-side rotation axis defined by the first coupling device is different from a second distance between the second door-side rotation axis and the second defined by the second coupling device container-side axis of rotation.
  • the second door-side hinge only exactly one joint, e.g. a ball joint, and thus defines the aforementioned pivot point
  • the second distance can also be defined as the distance between the second container-side axis of rotation and the door-side pivot point defined by the exactly one second door-side joint.
  • the first distance may be the smallest distance between the first door-side joints and the first tank-side rotation axis.
  • the first distance may e.g. at least 1.1 times, at least 1.2 times or at least 1.5 times the second distance.
  • This may be particularly advantageous in order to facilitate a cleaning of the door in the open position, in particular on a door inner side facing the container.
  • the plane spanned by the container-side axes of rotation extends parallel to a vertical.
  • the opening angle is typically at least 20 °, preferably at least 30 °, more preferably at least 40 °.
  • the opening angle is usually at most 80 °, preferably at most 70 °, particularly preferably at most 60 °.
  • the opening angle can be defined on the door side by a straight line perpendicular to the first door-side axis of rotation and passes through said door-side pivot point, which is determined by the exact second door-side hinge.
  • the first distance to the second distance has a spacing ratio of less than 1.
  • said opening angle may decrease upon movement of the door from a closed position to an open position.
  • the container opening is usually in a plane which is spanned by an edge of the container bounding the container opening. For example, in a closed position, the door is then vertically aligned.
  • the container opening may also lie in a plane which includes a non-zero angle with a vertical plane. Such an inclination angle of a container opening plane can be, for example, at least 10 °.
  • a sealing surface of the door, which surrounds the container opening in a closed position, abuts against a door abutment surface of the container and preferably seals the container opening, is typically oriented substantially parallel to the container opening plane in the closed position.
  • the door in the closed position typically also has that angle of inclination to the vertical plane.
  • the gravitational force acting on the door which acts in the center of gravity of the door and points vertically downwards, can thus be used to achieve a closing and sealing effect.
  • the door can seal the container opening in a closed state.
  • the container-side and the door-side joints are arranged and configured such that a first plane, which is spanned by the first door-side rotation axis and by the first container-side rotation axis, in the closed position in which the door closes the container opening , Is aligned parallel to a second plane, which is spanned by the second door-side axis of rotation and the second container-side axis of rotation.
  • the second door-side joint comprises only one joint, z. B.
  • said second plane can be spanned by this door-side pivot point and the second container-side axis of rotation instead of the second door-side axis of rotation and the second container-side axis of rotation.
  • a sealing force by which the sealing surface of the door is pressed in the closed position to the door contact surface of the container can thus be distributed substantially uniformly over the sealing surface of the door.
  • a movement force acting on the door is applied by the gravitational force acting on the door, for example by the above-described inclined arrangement of the container opening plane or by a guided movement direction which contains a vertical component.
  • the first coupling device may comprise a first adjusting device for changing the first distance.
  • the second coupling device may comprise a second adjusting device for changing the second distance.
  • the first and / or the second distance can be changed such that an orientation of the door relative to the container opening can be readjusted.
  • the first and / or the second distance may be adjustable such that the first and the second distance after adjustment have different lengths.
  • first and / or the second distance may be adjustable such that the first and / or the second door-side rotation axis from a position parallel to the first and / or second container-side axis of rotation in a position inclined relative to the first and / or second container-side axis of rotation is adjustable.
  • the guide construction which is realized by the first and the second coupling device, be adapted and sealing despite contamination or deformations of the door or container-side sealing surfaces can be realized. In the event of the statically clear leadership situation of the door on the three-point bearing described above is such an adjustment z. B.
  • the adjusting device can be realized comparatively easily, for example, according to a turnbuckle principle.
  • a right-handed and a left-handed thread are combined in such a way that, for example, the first and / or the second distance can be changed by turning an internal thread receiving the left- and right-handed threads.
  • the threads can be arranged for example on the coupling arms.
  • the first coupling device and / or the second coupling device may comprise one, preferably one, spring device.
  • the spring device can give the door an extra degree of freedom that can contribute to the self-sealing of the door. This can reduce the need for adjustment by an adjusting device, since the door can take over the effect of length adjustment within the structurally possible spring travel.
  • the door is typically a substantially rigid component, which may be exposed to strong influences of heat or temperature differences.
  • a container interior is usually much warmer than an external oven environment.
  • a container interior is heated to more than 800 ° C, while in the outer oven environment, temperatures of about 50 ° normally prevail. This can, for example, lead to deformations or, as a result of material changes in the refractory materials, cause changes in shape.
  • the at least one second container-side joint may also comprise at least two joints.
  • weight forces of the door can be distributed to different container-side joints.
  • the second door-side joint comprises only one joint
  • at least two second container-side joints can be arranged such that a position of a perpendicular projection of the exactly one second door-side joint is arranged on the second container-side pivot axis defined second container side axis of rotation along the second container side axis of rotation between two of the at least two second container side joints, preferably centrally.
  • at least two of the at least two first door-side joints in this case can each have an identical distance from the exactly one second door-side joint.
  • At least one of the at least one first container-side joint may comprise a ball joint. It is also possible for a plurality of the at least one first container-side joint to comprise a ball joint.
  • the oven door can receive further degrees of freedom, which can allow automatic door alignment by tumbling. Act no driving forces on the door, the door can self-align until it remains in a rest position. In the rest position, a balance of power has typically set and the door is located with its sealing surface on the door bearing surface.
  • the oven may further comprise a locking device for locking the door in an open state of the door and / or in a closed state of the door. This ensures that the door is securely anchored while a person cleans the door or while cleaning the oven interior.
  • the door can apply sufficient sealing force to the door abutment surface surrounding the container opening only by virtue of its weight force, so that the container opening is sufficiently sealed in the closed position of the door.
  • the oven may additionally or alternatively also include a drive for moving the door from the open state to the closed state and / or vice versa. By a driving force, the door can be moved.
  • the drive may apply a force in the direction of the door abutment surface, preferably perpendicular to the door abutment surface, on the door when the door is already in the closed position is, so that a sealing effect is increased.
  • the drive can support, for example, only one opening or closing movement.
  • the drive may comprise, for example, an electric motor and a cable winch connected thereto, wherein the door can be pulled up or down on the reel by winding or unwinding a chain or steel cable.
  • the drive can also be realized in the form of an actuator, which is integrated, for example, in the second coupling arm.
  • the Figures 1 and 2 each show a section of a furnace 1, for example for melting metal, in a perspective view.
  • the furnace has a container 2 for receiving a molten metal.
  • the container 2 has an opening 3.
  • the oven further comprises a door 4 adapted to open and close the opening 3.
  • the joints 5, 5 'are designed here as hinges and define a first door-side axis of rotation 5d.
  • Exactly a second door-side joint 6 is fixed relative to the door 4 and spaced from the axis of rotation 5d. That's exactly one second door-side joint 6 is formed, for example, as a ball joint and defines a pivot point 6d.
  • a first coupling device 7 connects the door 4 movably to the container 2 via the two first door-side joints 5 and 5 '.
  • a second coupling device 8 movably connects the container 2 via the exactly one door-side joint 6 to the door 4.
  • the second container-side joint 10 is spaced from the first container-side hinge 9. For example, the joint is disposed along the vertical above the hinge 9.
  • the first coupling device 7 has first coupling arms 7 'and 7 "The coupling arm 7' rigidly connects the first door-side hinge 5 'to the first container-side hinge 9'.”
  • the coupling arm 7 "rigidly connects the first door-side hinge 5 to the first container-side hinge 9.
  • the second coupling device 8 has a second coupling arm 8 'which connects the exactly one second door-side joint 6 rigidly with the container-side joints 10 and 10'.
  • the second coupling arm 8 ' is designed as a steel bracket.
  • the door-side rotation axis 5d and the container-side rotation axes 9d and 10d are aligned in pairs in parallel, e.g. at least in a construction situation.
  • a first distance a1 between the first container-side rotation axis 9d and the first door-side rotation axis 5d describes in each case a length of the first coupling arms 7 ", 7. 'The first distance a1 is, for example 45 cm.
  • a second distance a2 between the second container-side rotation axis 10d and the pivot point defined by the exactly one second door-side joint 6 is here, in contrast, z. B. only 30 cm.
  • the first distance a1 defined by the first coupling arms 7 'and 7 " is therefore greater than the second distance a2 in the exemplary embodiment shown here, with the result that an opening angle ⁇ between a container-side plane and the container-side rotation axes 9d and 10d is spanned, and a door-side plane, which is spanned by the first door-side pivot axis 5d and defined by the exactly one door-side hinge 6 door-side pivot point 6d increases when opening the door 4.
  • the angle ⁇ door side also be defined by a straight line that perpendicularly intersects the door-side rotation axis 5d and passes through the pivot point defined by the exactly one second door-side hinge 6.
  • the angle is ⁇ 1, for example, 20 °
  • the angle ⁇ 2 is for example 30 °, as in FIG. 5 is clearly visible.
  • the first coupling arms 7 'and 7 "are formed longer than the second distance a2, the door can thus be particularly well viewed and cleaned from one of the opening 3 side facing.
  • the first coupling device 7 and the second coupling device 8 each have, for example, an adjusting device.
  • a turnbuckle is integrated on the first coupling arms 7 ', 7 ", so that the first coupling arms 7' and 7" can each be adapted independently of one another in terms of their length.
  • a further adjusting device may be arranged such that the second distance a2 is adaptable by the further adjusting device.
  • the oven 1, in particular the first and / or the second coupling device 7, 8 comprise a spring device, which gives the door 4 an additional self-sealing degree of freedom. This can reduce the need for adjustment, since the door 4 can take over the effect of length adjustment within the structurally possible spring travel.
  • the second door-side joint 6 is arranged exactly in the vertical door center plane in the embodiment shown here.
  • On the door body attacks at least one chain, which can be rolled up and unrolled by means of a reel 11.
  • the reel 11 is driven by an electric motor 12.
  • By rolling up and unrolling the chain from the reel the door is either raised so that the door 4 releases the opening 3 or the door 4 is lowered so that the opening 3 is closed.
  • the door 4 can be locked in any position between an open and a closed position.
  • the door 4 can also be driven otherwise, for example via actuators, which form the second coupling arm 8 'or are encompassed by it.
  • FIG. 3 schematically shows a coupling gear.
  • the coupling mechanism shown essentially corresponds to the coupling mechanism for moving the door 4 of Figures 1 and 2 .
  • the door 4 is hingedly connected to the container 2 via the first door-side joint, via the first coupling device 7 and via the first container-side joint 9. Furthermore, the door 4 is connected to the container 2 via the second door-side joint 6, via the second coupling device 8 and via the second container-side joint 10.
  • the distances a1 and a2 are in FIG. 3 Simplified shown with identical length. The distances a1 and a2 of Figures 1 and 2 are different.
  • FIG. 4 shows a schematic view of a door system, the door system of Figures 1 and 2 equivalent.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
EP17193655.2A 2017-09-28 2017-09-28 Système de porte destiné à l'ouverture et à la fermeture d'une ouverture du récipient d'un four Withdrawn EP3462118A1 (fr)

Priority Applications (8)

Application Number Priority Date Filing Date Title
EP17193655.2A EP3462118A1 (fr) 2017-09-28 2017-09-28 Système de porte destiné à l'ouverture et à la fermeture d'une ouverture du récipient d'un four
PCT/EP2018/076179 WO2019063643A1 (fr) 2017-09-28 2018-09-26 Système de porte pour ouvrir et fermer une ouverture de récipient d'un four
ES18772838T ES2893158T3 (es) 2017-09-28 2018-09-26 Sistema de puerta para abrir y cerrar una abertura de recipiente de un horno
EP18772838.1A EP3688395B1 (fr) 2017-09-28 2018-09-26 Système de porte destiné à l'ouverture et à la fermeture d'une ouverture du récipient d'un four
CN201880063464.3A CN111480047B (zh) 2017-09-28 2018-09-26 用于打开和关闭炉子的容器开口的门系统
PL18772838T PL3688395T3 (pl) 2017-09-28 2018-09-26 Układ drzwiowy do otwierania i zamykania otworu zasobnika pieca
MX2020004820A MX2020004820A (es) 2017-09-28 2018-09-26 Sistema de puerta para abrir y cerrar una abertura de recipiente de un horno.
DK18772838.1T DK3688395T3 (da) 2017-09-28 2018-09-26 Dørsystem til at åbne og lukke en beholderåbning af en ovn

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17193655.2A EP3462118A1 (fr) 2017-09-28 2017-09-28 Système de porte destiné à l'ouverture et à la fermeture d'une ouverture du récipient d'un four

Publications (1)

Publication Number Publication Date
EP3462118A1 true EP3462118A1 (fr) 2019-04-03

Family

ID=60019692

Family Applications (2)

Application Number Title Priority Date Filing Date
EP17193655.2A Withdrawn EP3462118A1 (fr) 2017-09-28 2017-09-28 Système de porte destiné à l'ouverture et à la fermeture d'une ouverture du récipient d'un four
EP18772838.1A Active EP3688395B1 (fr) 2017-09-28 2018-09-26 Système de porte destiné à l'ouverture et à la fermeture d'une ouverture du récipient d'un four

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP18772838.1A Active EP3688395B1 (fr) 2017-09-28 2018-09-26 Système de porte destiné à l'ouverture et à la fermeture d'une ouverture du récipient d'un four

Country Status (7)

Country Link
EP (2) EP3462118A1 (fr)
CN (1) CN111480047B (fr)
DK (1) DK3688395T3 (fr)
ES (1) ES2893158T3 (fr)
MX (1) MX2020004820A (fr)
PL (1) PL3688395T3 (fr)
WO (1) WO2019063643A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110601438A (zh) * 2019-09-05 2019-12-20 神华福能发电有限责任公司 一种密封装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT380566B (de) * 1984-06-08 1986-06-10 Herbert Hofmann Ing He Ofen fuer die waermebehandlung von werkstuecken und werkstoffen
US20060024633A1 (en) * 2004-07-30 2006-02-02 Eduard Levin Kiln lip position control assembly
EP2044377A1 (fr) * 2006-06-20 2009-04-08 Empco (Canada) Ltd. Dispositif d'étanchéité pour porte de décrassage de four métallurgique
US20110168707A1 (en) * 2010-01-13 2011-07-14 Reeves Eric W Molten metal containment structure having movable cover

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007057410B3 (de) * 2007-11-27 2009-07-30 Uhde Gmbh Mechanismus und Verfahren zur automatisierbaren Verriegelung von Türen, Türkörpern oder Türrahmen horizontaler Koksofenkammern
JP6263407B2 (ja) * 2014-02-10 2018-01-17 光洋サーモシステム株式会社 熱処理装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT380566B (de) * 1984-06-08 1986-06-10 Herbert Hofmann Ing He Ofen fuer die waermebehandlung von werkstuecken und werkstoffen
US20060024633A1 (en) * 2004-07-30 2006-02-02 Eduard Levin Kiln lip position control assembly
EP2044377A1 (fr) * 2006-06-20 2009-04-08 Empco (Canada) Ltd. Dispositif d'étanchéité pour porte de décrassage de four métallurgique
US20110168707A1 (en) * 2010-01-13 2011-07-14 Reeves Eric W Molten metal containment structure having movable cover

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110601438A (zh) * 2019-09-05 2019-12-20 神华福能发电有限责任公司 一种密封装置
CN110601438B (zh) * 2019-09-05 2024-04-23 神华（福建）能源有限责任公司 一种密封装置

Also Published As

Publication number Publication date
CN111480047A (zh) 2020-07-31
ES2893158T3 (es) 2022-02-08
DK3688395T3 (da) 2021-10-25
CN111480047B (zh) 2022-07-08
PL3688395T3 (pl) 2022-01-10
WO2019063643A1 (fr) 2019-04-04
MX2020004820A (es) 2020-08-13
EP3688395A1 (fr) 2020-08-05
EP3688395B1 (fr) 2021-07-28

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