CN110711959B - Vacuum welding device and installation and use method - Google Patents
Vacuum welding device and installation and use method Download PDFInfo
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- CN110711959B CN110711959B CN201911112000.XA CN201911112000A CN110711959B CN 110711959 B CN110711959 B CN 110711959B CN 201911112000 A CN201911112000 A CN 201911112000A CN 110711959 B CN110711959 B CN 110711959B
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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
- B23K28/00—Welding or cutting not covered by any of the preceding groups, e.g. electrolytic welding
- B23K28/003—Welding in a furnace
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Abstract
The application discloses a vacuum welding device and an installation and use method, wherein side wall adjusting columns are arranged on the left side and the right side of a bottom base of the vacuum welding device, a table top for placing a U-shaped structure main body is arranged on the bottom base, a top pressing plate is arranged above the bottom base, and the top pressing plate and the bottom base are fixedly connected through a first fixing piece; the upper part of the side wall adjusting column is positioned in front of the upper part of the longitudinal part of the main body U-shaped structure, and the upper part of the side wall adjusting column is respectively provided with an adjusting screw in the front-back direction; a bottom base outside the side wall adjusting column is connected with a magnetic shielding adjusting screw rod; the vacuum sealing of a plurality of key parts of the main body is ensured to be completed simultaneously, and uncontrollable form and position tolerance caused by a plurality of working procedures is avoided; the method is suitable for welding components in a high-temperature vacuum environment, guarantees form and position tolerance of key positions of the components, and guarantees smooth and non-offset paths of cesium atoms; the main body can be welded at one time and used for a long time, and the yield of the cavity assembly is improved.
Description
Technical Field
The application relates to the technical field of main body welding manufacturing, in particular to a vacuum welding device and an installation and use method.
Background
At present, the main body is used as a key component of cesium clock physics, and how to assemble and weld all structures of the main body together is a key problem in the application process, and therefore, a vacuum welding device is needed, so that the main body can be smoothly welded into a component in a high-temperature vacuum environment, form and position tolerances of key positions of the component are guaranteed, and further, smooth and non-offset paths of cesium atoms are guaranteed. The patent document of the Chinese utility model with the publication number of CN204248234U discloses a welding device of cesium release agent for electric vacuum, which comprises a material pipe box, a material pipe feeding device, two material pipe boxes, two sets of sleeve feeding devices, a clamping rod, a shaping seal welding device and a discharging device, wherein the material pipe feeding device comprises a fixed mould and a feeding cylinder I, the sleeve feeding device comprises a gas chuck and a feeding cylinder II, the gas chuck is positioned at two sides of the fixed mould, the air chuck and the round groove are arranged on the same axis, the clamping rod is arranged above the round groove, the discharging device is arranged below the fixed die, the product collecting box is arranged below the discharging device, although the welding efficiency can be improved, the vacuum sealing of a plurality of key parts of the main body cannot be completed simultaneously, and the problem of uncontrollable form and position tolerance caused by a plurality of working procedures exists.
Disclosure of Invention
The application provides a vacuum welding device and an installation and use method, and aims to solve the problem that multiple processes cause uncontrollable form and position tolerance because vacuum sealing of multiple key parts of a main body cannot be completed simultaneously in the prior art.
The vacuum welding device comprises a bottom base, a transverse top pressing plate, a longitudinal side wall adjusting column, a longitudinal magnetic shielding adjusting screw and a transverse adjusting screw;
the left side and the right side of the bottom base are respectively connected with a side wall adjusting column, a table top for placing a main body of a U-shaped structure is arranged on the bottom base, and the table top is an arc-shaped convex surface positioned between the side wall adjusting columns;
a top pressure plate for clamping and fixing the main body in cooperation with the table top is arranged above the bottom base, and the top pressure plate and the bottom base are fixedly connected through a first fixing piece for fixing the top pressure plate, the main body and the bottom base;
the upper part of the side wall adjusting column is positioned in front of the upper part of the longitudinal part of the U-shaped structure of the main body, the upper part of the side wall adjusting column is respectively provided with a connecting screw hole in the front-back direction, and an adjusting screw for adjusting the flatness of the main body is respectively arranged in the connecting screw holes;
the bottom base outside the side wall adjusting column is connected with a magnetic shielding adjusting screw rod used for adjusting the parallelism between the main body and the bottom base.
The installation method of the vacuum welding apparatus of the present invention may include the steps of,
connecting the side wall adjusting columns to the left side and the right side of the bottom base;
connecting a magnetic shielding adjusting screw to the bottom base outside the side wall adjusting column;
and attaching the side surface of the side wall adjusting column to the adjacent side surface of the table board.
The method of using the vacuum welding apparatus of the present invention may include the steps of,
placing a body on the table top between a bottom base and a top platen;
the top pressing plate, the main body and the bottom base are fixedly connected through the first fixing piece, so that the upper parts of the longitudinal parts of the U-shaped structure of the main body are respectively positioned behind the upper parts of the side wall adjusting columns;
rotating the left and right adjusting screws to adjust the jacking degree of the adjusting screws on the upper part of the longitudinal part of the U-shaped structure of the main body, so as to adjust the flatness of the main body;
the magnetic shielding adjusting screw rods on the left side and the right side are rotated to realize the parallelism between the adjusting main body and the bottom base.
The vacuum welding device of the invention can also preferably be characterized in that at least four first fixing holes which are uniformly distributed into a square shape are respectively arranged on the main body, the top pressing plate and the bottom base, and the main body, the top pressing plate and the bottom base are fixedly connected in the first fixing holes through first fixing pieces.
Preferably, at least four second fixing holes which are uniformly distributed into a square are formed in the table board and the main body, the second fixing holes are screw holes, external threads matched with the second fixing holes are formed in the outer wall of the second fixing piece, and the main body is connected with the bottom base through the second fixing piece arranged in the second fixing holes.
It can also be preferred, the left side and the right side of the upper surface of bottom base are provided with the post hole respectively, and two post holes evenly distributed, and the lower extreme of lateral wall regulation post is inserted respectively in the post hole, on the lower terminal surface of lateral wall regulation post, and every all be provided with two evenly distributed's third fixed orifices on the bottom base below the post hole, on the bottom base the upper end of third fixed orifices with the lower extreme intercommunication in post hole, on the bottom base the third fixed orifices be the step hole of "protruding" font for longitudinal section, the upper portion in step hole is the screw, be provided with on the outer wall of third mounting with the external screw thread that the third fixed orifices matches, lateral wall regulation post and bottom base are through setting up third mounting in the third fixed orifices is connected.
Preferably, at least four fourth fixing holes are formed in the table top and the main body and are evenly distributed to form a square, and the main body is connected with the bottom base through fourth fixing pieces arranged in the fourth fixing holes.
The installation method of the vacuum welding apparatus of the present invention may include the steps of,
when the side wall adjusting column is connected to the left side and the right side of the bottom base, the side wall adjusting column is placed in the column hole on the bottom base, the step hole below the bottom base penetrates into the third fixing hole in the lower end face of the side wall adjusting column through the third fixing piece, and the third fixing piece is rotated to fix the side wall adjusting column.
The installation method of the vacuum welding apparatus of the present invention may include the steps of,
when the magnetic shielding adjusting screw is connected to the bottom base outside the side wall adjusting column, the height of the lower end face of the magnetic shielding adjusting screw is smaller than that of the upper end face of the stepped hole.
The method of using the vacuum welding apparatus of the present invention may include the steps of,
when the main body is placed on the table top between the bottom base and the top pressing plate, the bottom arc-shaped part of the U-shaped structure of the main body is placed on the table top, the second fixing holes in the table top and the main body are aligned, and the main body is fixed through the second fixing piece arranged in the second fixing hole and the second fixing piece arranged in the second fixing hole; and connecting and fixing the top pressing plate with the main body and the bottom base through a first fixing piece.
The vacuum welding device and the installation and use method can achieve the following beneficial effects:
the vacuum welding device and the installation and use method can solve the problem that multiple processes cause uncontrollable form and position tolerance because vacuum sealing of multiple key parts of a main body cannot be completed simultaneously in the prior art, can ensure simultaneous vacuum sealing of the multiple key parts of the main body, and avoid uncontrollable form and position tolerance caused by the multiple processes; the cesium atom welding device can be smoothly used for welding into a component in a high-temperature vacuum environment, and the form and position tolerance of the key position of the cesium atom welding device is guaranteed, so that the path of cesium atoms is smooth and does not deviate; the main body can be welded at one time and used for a long time, and the yield of the cavity assembly is greatly improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic structural view of a vacuum welding apparatus according to the present application.
Fig. 2 is a front view of a bottom base of the vacuum welding apparatus of the present application.
Fig. 3 is a top view of the bottom base of the vacuum welding apparatus of the present application.
Fig. 4 is a front view of a top platen of the vacuum welding apparatus of the present application.
Fig. 5 is a top view of a top platen of the vacuum welding apparatus of the present application.
FIG. 6 is a front view of a sidewall adjustment stud of the vacuum welding apparatus of the present application.
FIG. 7 is a top view of a sidewall adjustment stud of the vacuum welding apparatus of the present application.
Fig. 8 is a schematic structural view of a magnetic shield adjusting screw of the vacuum welding apparatus of the present application.
Fig. 9 is a schematic structural view of an adjusting screw of the vacuum welding apparatus of the present application.
In the figure, 1 is a bottom base, 2 is a top pressing plate, 3 is a side wall adjusting column, 4 is a magnetic shielding adjusting screw, 5 is an adjusting screw, 6 is a first fixing piece, 7 is a second fixing piece, 8 is a third fixing piece, 9 is a fourth fixing piece, and 10 is a main body.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Example 1
A vacuum welding device, please see figure 1, comprising a bottom base 1, a transverse top pressure plate 2, a longitudinal side wall adjusting column 3, a longitudinal magnetic shielding adjusting screw rod 4 and a transverse adjusting screw 5;
referring to fig. 2 and 3, the left side and the right side of the bottom base 1 are respectively connected with a side wall adjusting column 3, a table top for placing a main body 10 with a U-shaped structure is arranged on the bottom base 1, and the table top is an arc convex surface positioned between the side wall adjusting columns 3;
referring to fig. 4 and 5, a top pressing plate 2 for clamping and fixing a main body 10 in cooperation with a table top is arranged above a bottom base 1, and the top pressing plate 2 and the bottom base 1 are fixedly connected through a first fixing member 6 for fixing the top pressing plate 2, the main body 10 and the bottom base 1;
referring to fig. 6 and 7, the upper portion of the side wall adjusting column 3 is located in front of the upper portion of the longitudinal portion of the U-shaped structure of the main body 10, the upper portion of the side wall adjusting column 3 is respectively provided with connecting screw holes in the front-rear direction, referring to fig. 9, the connecting screw holes are respectively provided with an adjusting screw 5 for adjusting the flatness of the main body 10;
referring to fig. 8, a magnetic shielding adjusting screw 4 for adjusting the parallelism between the main body 10 and the bottom base 1 is connected to the bottom base 1 outside the sidewall adjusting column 3. The outer side here refers to the side remote from the center point of the base 1 with respect to the center point.
The method for mounting the vacuum welding apparatus of the present embodiment may include the steps of,
connecting the side wall adjusting columns 3 to the left side and the right side of the bottom base 1;
connecting a magnetic shielding adjusting screw 4 to the bottom base 1 outside the side wall adjusting column 3; the outer side here refers to the side remote from the center point of the base 1 with respect to the center point.
And (3) attaching the side surface of the side wall adjusting column 3 to the adjacent side surface of the table board.
The method for using the vacuum welding device of the embodiment can comprise the following steps,
placing the body 10 on the table between the bottom base 1 and the top platen 2;
the top pressing plate 2, the main body 10 and the bottom base 1 are fixedly connected through a first fixing piece 6, so that the upper parts of the longitudinal parts of the U-shaped structure of the main body 10 are respectively positioned behind the upper parts of the side wall adjusting columns 3;
rotating the left and right adjusting screws 5 to adjust the degree of the tightening of the adjusting screws 5 against the upper part of the longitudinal part of the U-shaped structure of the main body 10, thereby achieving the adjustment of the flatness of the main body 10;
the magnetic shield adjusting screws 4 on the left and right sides are rotated to achieve parallelism between the adjusting body 10 and the bottom base 1.
Example 2
A vacuum welding device is similar to embodiment 1, except that at least four first fixing holes uniformly distributed into a square shape are respectively formed in a main body 10, a top pressing plate 2 and a bottom base 1, and the main body 10, the top pressing plate 2 and the bottom base 1 are fixedly connected in the first fixing holes through first fixing pieces 6.
Still further, at least four second fixing holes which are uniformly distributed into a square are formed in the table top and the main body 10, the second fixing holes are screw holes, external threads matched with the second fixing holes are formed in the outer wall of the second fixing piece 7, and the main body 10 is connected with the bottom base 1 through the second fixing piece 7 arranged in the second fixing holes.
Still further, the left side and the right side of the upper surface of bottom base 1 are provided with the post hole respectively, and two post holes evenly distributed, and the lower extreme of lateral wall regulation post 3 inserts respectively in the post hole, on the lower terminal surface of lateral wall regulation post 3, and every all be provided with two evenly distributed's third fixed orifices on the bottom base 1 below the post hole, on the bottom base 1 the upper end of third fixed orifice with the lower extreme intercommunication in post hole, on the bottom base 1 the third fixed orifice is the step hole that longitudinal section is "protruding" font, the upper portion in step hole is the screw, be provided with on the outer wall of third mounting 8 with the external screw thread that the third fixed orifice matches, lateral wall regulation post 3 and bottom base 1 are through setting up third mounting 8 in the third fixed orifice is connected.
Still further, at least four fourth fixing holes uniformly distributed in a square shape are formed in the table top and the main body 10, and the main body 10 is connected with the bottom base 1 through fourth fixing pieces 9 arranged in the fourth fixing holes.
The method for mounting the vacuum welding apparatus of the present embodiment may include the steps of,
when the side wall adjusting column 3 is connected to the left side and the right side of the bottom base 1, the side wall adjusting column 3 is placed in the column hole on the bottom base 1, the step hole below the bottom base 1 penetrates into the third fixing hole on the lower end face of the side wall adjusting column 3 through the third fixing piece 8, and the third fixing piece 8 is rotated to fix the side wall adjusting column 3.
The method for mounting the vacuum welding apparatus of the present embodiment may include the steps of,
when the magnetic shield adjusting screw 4 is attached to the bottom base 1 outside the side wall adjusting post 3, the height of the lower end face of the magnetic shield adjusting screw 4 is smaller than the height of the upper end face of the stepped hole.
The method for using the vacuum welding device of the embodiment can comprise the following steps,
when the main body 10 is placed on the table top between the bottom base 1 and the top pressing plate 2, the bottom arc-shaped part of the U-shaped structure of the main body 10 is placed on the table top, the second fixing holes on the table top and the main body 10 are aligned, and the main body is fixed by the second fixing piece 7 arranged in the second fixing hole and the second fixing piece 7 arranged in the second fixing hole; the top press plate 2 is connected and fixed with the main body 10 and the bottom base 1 through the first fixing piece 6.
The vacuum welding device and the installation and use method of the vacuum welding device are suitable for 700-900 ℃. Wherein the left-right direction refers to the left-right direction in fig. 1, and the front and rear directions refer to the directions toward the outside and the inside of the vertical paper in fig. 1. The form and position tolerance of the main body 10 is ensured through the adjusting screw 5 and the magnetic shielding adjusting screw rod 4, so that the one-time success of vacuum welding is ensured. After the main body 10 assembly is assembled, the vacuum welding device meets required form and position tolerance, realizes one-time high-temperature vacuum furnace welding, and improves the reliability and the leveling rule of the main body 10 assembly. Step hole on the base 1 of bottom sets up to the bilateral symmetry structure who uses the central point of base 1 of bottom as the symmetric point, guarantees that lateral wall regulation post 3, magnetic screen adjusting screw 4 are at left right direction evenly distributed, and lateral wall regulation post 3, magnetic screen adjusting screw 4 symmetric distribution guarantee that main part 10 subassembly atress is even on main part 10 simultaneously. The adjusting screw 5 is screwed into the top end of the side wall adjusting column 3 for adjusting the flatness of the top structure of the main body 10; the depth of the bottom base 1 is screwed in through the magnetic shielding adjusting screw rod 4 so as to adjust the parallelism of the main body 10 and the bottom base 1, and the adjustable stroke meets the requirement, so that the stress of the main body 10 is uniform. The bottom base 1 and the top pressing plate 2 can be made of 304 stainless steel, so that the device is guaranteed to be not deformed in multiple welding and use at 800 ℃, one-step forming in welding is guaranteed, and form and position tolerance of the welded cavity assembly is realized. The area of the top of the magnetic shielding adjusting screw rod 4 can be set as required to ensure the high-temperature support of the magnetic shielding, the material of the magnetic shielding adjusting screw rod can be 304 stainless steel, and the creep property of the magnetic shielding adjusting screw rod in a high-temperature environment is ensured to be good. The first fixing member 6, the second fixing member 7, the third fixing member 8 and the fourth fixing member 9 have the function of meeting the predetermined requirement of the action tolerance of each position after the integral assembly, and the material of the action tolerance can be 304 stainless steel. The top press plate 2 can be an I-shaped plate.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (9)
1. A vacuum welding device comprises a bottom base, a transverse top pressing plate, a longitudinal side wall adjusting column, a longitudinal magnetic shielding adjusting screw rod and a transverse adjusting screw; it is characterized in that the preparation method is characterized in that,
the left side and the right side of the bottom base are respectively connected with a side wall adjusting column, a table top for placing a main body of a U-shaped structure is arranged on the bottom base, and the table top is an arc-shaped convex surface positioned between the side wall adjusting columns;
a top pressure plate for clamping and fixing the main body in cooperation with the table top is arranged above the bottom base, and the top pressure plate and the bottom base are fixedly connected through a first fixing piece for fixing the top pressure plate, the main body and the bottom base;
the upper part of the side wall adjusting column is positioned in front of the upper part of the longitudinal part of the U-shaped structure, the upper part of the side wall adjusting column is respectively provided with a connecting screw hole in the front-back direction, and an adjusting screw for adjusting the flatness of the main body is respectively arranged in the connecting screw holes;
the bottom base outside the side wall adjusting column is connected with a magnetic shielding adjusting screw rod used for adjusting the parallelism between the main body and the bottom base;
the side wall adjusting columns and the magnetic shielding adjusting screws are symmetrically distributed on the main body;
at least four first fixing holes which are uniformly distributed into a square shape are respectively formed in the main body, the top pressing plate and the bottom base, and the main body, the top pressing plate and the bottom base are fixedly connected in the first fixing holes through first fixing pieces.
2. The vacuum welding apparatus of claim 1, wherein at least four second fixing holes are uniformly distributed in a square shape on the table top and the main body, the second fixing holes are screw holes, external threads matching with the second fixing holes are provided on the outer wall of the second fixing member, and the main body and the bottom base are connected by the second fixing member disposed in the second fixing holes.
3. The vacuum welding apparatus as claimed in claim 2, wherein the bottom base is provided with pillar holes on left and right sides of an upper surface thereof, and the two pillar holes are uniformly distributed, lower ends of the side wall adjusting pillars are inserted into the pillar holes, respectively, two uniformly distributed third fixing holes are provided on a lower end surface of the side wall adjusting pillar and the bottom base below each of the pillar holes, upper ends of the third fixing holes on the bottom base communicate with lower ends of the pillar holes, the third fixing holes on the bottom base are stepped holes having a longitudinal section in a shape of "convex", upper portions of the stepped holes are screw holes, outer walls of the third fixing members are provided with external threads matching with the third fixing holes, and the side wall adjusting pillar and the bottom base are connected by a third fixing member provided in the third fixing hole.
4. A vacuum welding apparatus as defined in claim 3, wherein said table top and said main body are provided with at least four fourth fixing holes uniformly distributed in a square shape, and said main body and said bottom base are connected by a fourth fixing member provided in said fourth fixing holes.
5. A method of mounting a vacuum welding apparatus as defined in any one of claims 1-4, comprising the steps of,
connecting the side wall adjusting columns to the left side and the right side of the bottom base;
connecting a magnetic shielding adjusting screw to the bottom base outside the side wall adjusting column;
and attaching the side surface of the side wall adjusting column to the adjacent side surface of the table board.
6. The method of mounting a vacuum welding apparatus as recited in claim 5, comprising the steps of,
when the side wall adjusting column is connected to the left side and the right side of the bottom base, the side wall adjusting column is placed in the column hole in the top of the bottom base, the third fixing piece penetrates into the third fixing hole in the lower end face of the side wall adjusting column from the step hole in the bottom base, and the third fixing piece is rotated to fix the side wall adjusting column.
7. The method of mounting a vacuum welding apparatus as recited in claim 6, comprising the steps of,
when the magnetic shielding adjusting screw is connected to the bottom base outside the side wall adjusting column, the height of the lower end face of the magnetic shielding adjusting screw is smaller than that of the upper end face of the stepped hole.
8. A method of using a vacuum welding apparatus as defined in any one of claims 1-4, comprising the steps of,
placing a body on the table top between a bottom base and a top platen;
the top pressing plate, the main body and the bottom base are fixedly connected through the first fixing piece, so that the upper parts of the longitudinal parts of the U-shaped structures are respectively positioned behind the upper parts of the side wall adjusting columns;
rotating the adjusting screws on the left side and the right side to adjust the jacking degree of the adjusting screws on the upper parts of the longitudinal parts of the U-shaped structures, so as to adjust the flatness of the main body;
the magnetic shielding adjusting screw rods on the left side and the right side are rotated to realize the parallelism between the adjusting main body and the bottom base.
9. The method of using a vacuum welding apparatus as defined in claim 8, including the steps of,
when the main body is placed on the table top between the bottom base and the top pressing plate, the bottom arc-shaped part of the U-shaped structure is placed on the table top, the second fixing holes in the table top and the main body are aligned, and the main body is fixed through a second fixing piece arranged in the second fixing hole and a second fixing piece arranged in the second fixing hole; and connecting and fixing the top pressing plate with the main body and the bottom base through a first fixing piece.
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| CN201911112000.XA CN110711959B (en) | 2019-11-14 | 2019-11-14 | Vacuum welding device and installation and use method |
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| CN201911112000.XA CN110711959B (en) | 2019-11-14 | 2019-11-14 | Vacuum welding device and installation and use method |
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| CN110711959B true CN110711959B (en) | 2021-07-20 |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| SU747669A1 (en) * | 1976-04-28 | 1980-07-15 | Центральное Проектно-Конструкторское Бюро Главного Управления По Монтажу Предприятий Легкой И Пищевой Промышленности | Apparatus for welding spherical tanks from meridian pieces |
| CN204248234U (en) * | 2014-09-02 | 2015-04-08 | 南京善工真空电子有限公司 | A kind of welder of electrovacuum caesium releasing agent |
| CN104924116B (en) * | 2015-06-09 | 2017-07-14 | 常熟赛驰机械有限公司 | The processing technology of central bracket |
| CN106975941A (en) * | 2017-03-29 | 2017-07-25 | 长治清华机械厂 | Arc support type component levelling device |
| CN108673024B (en) * | 2018-07-13 | 2020-04-24 | 北京无线电计量测试研究所 | Cavity assembly welding and fastening device |
| CN209256211U (en) * | 2018-12-28 | 2019-08-16 | 无锡苏阳化工装备有限公司 | A kind of end socket rotation cutting tool |
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