Auxiliary welding equipment for heat supply network pipeline

Abstract

The invention discloses heat supply network pipeline welding auxiliary equipment, and belongs to the technical field of pipeline welding, the heat supply network pipeline welding auxiliary equipment comprises a supporting piece, an auxiliary piece, an adjusting device, an abutting piece and a tensioning mechanism, the supporting piece comprises a base and supporting beams arranged at the two ends of a bottom beam base, and the two supporting beams are distributed on the two sides of a pipeline welding seam; the supporting beam comprises a bottom beam and side beams fixed to the two sides of the bottom beam. The auxiliary parts and the side beams are arranged in a one-to-one correspondence mode, each auxiliary part comprises a fixed wheel and a movable wheel which are connected with the corresponding side beam, and the movable wheels are located on the upper sides of the fixed wheels. Except for the base under the device, the device is not provided with a blocking part for blocking or limiting the welding position, so that welding is facilitated, and a space is reserved between the base and the welding position, so that welding personnel can see the welding position and also can operate welding equipment.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline welding, and in particular to auxiliary equipment for welding heating network pipelines. Background Art

[0002] In the thermal system, the heat network pipe is a key component for heat transmission. Its quality and reliability are directly related to the operating efficiency and safety of the entire thermal system. The welding of the heat network pipe is an important process for connecting various pipe sections, and its quality control is particularly important.

[0003] During the welding process of heat network pipelines, auxiliary equipment is usually required to support the butt joint of the two pipelines. When the auxiliary equipment is installed between the two butted pipelines, they will occupy part of the space originally used for welding operations, and the operating range is limited, which makes it inconvenient for welders to operate during welding. Due to the obstruction of the auxiliary equipment, welders may not be able to clearly observe the actual situation of the weld, which not only increases the difficulty of welding, but may also lead to a decline in welding quality due to inconvenient operation. Summary of the invention

[0004] The purpose of the present invention is to solve the problem mentioned in the above background technology that due to the obstruction of auxiliary equipment, the welder may not be able to clearly observe the actual situation of the weld, which not only increases the difficulty of welding, but also may cause the welding quality to decline due to inconvenient operation.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A heating network pipeline welding auxiliary equipment comprises a support member, an auxiliary member, an adjusting device, an abutment member and a tensioning mechanism, the support member comprises a base and a supporting beam arranged at both ends of a bottom beam seat, the two supporting beams are distributed on both sides of the pipeline welding seam, the supporting beam comprises a bottom beam and side beams fixed on both sides of the bottom beam; the auxiliary member is arranged in a one-to-one correspondence with the side beams, the auxiliary member comprises a fixed wheel and a movable wheel connected to the side beams, the movable wheel is located on the upper side of the fixed wheel, the movable wheel is connected to the side beam through a slider, and a sliding groove for sliding the slider is provided on the side beam; the adjusting device is arranged on the support member, the adjusting device comprises an adjusting screw rotatably connected to the side beam, the adjusting screw is threadedly connected to the slider; the abutment member is connected to the side beam, the abutment member abuts against the pipeline, and a tensioning mechanism is arranged between the abutments on the two support beams.

[0006] Preferably, the adjusting device also includes a synchronization component, which includes a synchronization rod rotatably connected to the bottom beam, and a rod body rotatably connected to the bottom of the side beam, one end of the rod body is connected to the adjusting screw through a bevel gear pair 1, and the other end of the rod body is connected to the synchronization rod through a bevel gear pair 2.

[0007] Preferably, the abutment member is provided with an arc-shaped portion adapted to pipes of different sizes.

[0008] Preferably, a rubber pad for increasing friction is provided on the arc-shaped portion.

[0009] Preferably, the tensioning mechanism includes a sliding mechanism for adjusting the position of the abutment, the sliding mechanism includes a fixed shaft fixedly connected to the side beam, the end of the fixed shaft is rotatably connected to a track body, a track block is slidably connected to the track body, an adjusting bolt is threaded on the track body, the adjusting bolt is rotatably connected to the track block, and the abutment is rotatably connected to the track block.

[0010] Preferably, a locking gear is fixedly connected to the track body, a bracket is fixedly connected to the side beam, a locking bolt is threadedly connected to the bracket, the end of the locking bolt is rotatably connected to a locking tooth plate, a limiting rod is fixed on the locking tooth plate, and the limiting rod is slidably connected to the bracket.

[0011] Preferably, a support block is provided at the end of the track block, and the support block includes a sliding portion and a circular portion, the sliding portion is slidably connected to the track block, the abutment is rotatably connected to the circular portion, a threaded groove is provided on the circular portion, a sleeve extends from the abutment, a fixing hole is provided on the sleeve, the fixing holes correspond one-to-one to the arc-shaped portions, and a switching bolt is threadedly connected to the threaded groove.

[0012] Preferably, the tensioning mechanism also includes a tensioning component, which includes a bidirectional screw, both ends of which are connected to tensioning blocks, and a pull rod frame is slidably connected to the tensioning block, the upper end of the pull rod frame is fixed to the sliding part, and the sliding direction of the pull rod frame is perpendicular to the moving direction of the tensioning block.

[0013] Preferably, a driving rod is rotatably connected to the support beam, and the driving rod is connected to one end of the bidirectional screw rod through a bevel gear pair.

[0014] Preferably, a synchronous rack is slidably connected to the support beam, and both ends of the synchronous rack are meshed with locking gears on the corresponding sides.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The device can not only support the pipe to be welded, but also limit the upper side of the pipe under the action of the movable wheel, so that the welding is stable. In addition to the base directly below, the device has no blocking parts that block or limit the welding point, so it is conducive to welding. In addition, there is space between the base and the welding point, so that the welder can see the welding point and operate the welding equipment. On the same support beam, the synchronization component enables the two movable wheels to move synchronously, so that the pipeline is subjected to the same force, which is conducive to the stability of the pipeline; The abutment also restricts the pipeline from both sides, increasing the stability of the pipeline. On the same support beam, one track body is rotated, and the other track body is rotated through the synchronous rack, which not only reduces the operation steps but also makes the two abutments rotate with the same amplitude, and makes the two abutments symmetrically distributed on both sides of the pipeline, which is conducive to the fitting of the arc portion of the pipeline with the pipeline; The arc-shaped parts of different sizes on the abutment piece correspond to pipes of different sizes. The abutment piece is moved by adjusting the bolt, so that the arc-shaped part on the abutment piece can fit with the surface of pipes of different sizes. A rubber pad for increasing friction is provided on the arc-shaped part. When the abutment piece is tightened, the rubber pad can prevent slipping, which is conducive to applying tension to the pipe. The tensioning mechanism and the abutment member are used to apply a force to the two pipes to bring them closer together, so that the pipe joint is close and stable, ensuring that the ends of the two pipes are always in contact during the welding process, preventing gaps from appearing at the welding point, and greatly ensuring the efficiency and quality of welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 It is a schematic diagram of the bottom beam and the side beam of the present invention.

[0019] Figure 3 For the present invention Figure 2 Enlarged schematic diagram at point A in the middle.

[0020] Figure 4 It is a schematic diagram of the synchronization component of the present invention.

[0021] Figure 5 Schematic diagram of the synchronous rack of the present invention.

[0022] Figure 6 It is a schematic diagram of the sliding mechanism of the present invention.

[0023] Figure 7 It is a schematic diagram of the separation of the abutment member and the support block of the present invention.

[0024] Description of the figure numbers: 1. Support member; 11. Base; 12. Support beam; 121. Bottom beam; 122. Side beam; 1221. Slide; 2. Auxiliary member; 21. Fixed wheel; 22. Movable wheel; 23. Slider; 3. Adjustment device; 31. Adjustment screw; 32. Synchronous member; 321. Synchronous rod; 322. Rod body; 323. Bevel gear pair 1; 324. Bevel gear pair 2; 4. Abutment member; 41. Arc portion; 42. Rubber pad; 43. Sleeve; 44. Fixing hole; 5. Tensioning mechanism; 5 1. Sliding mechanism; 511. Fixed shaft; 512. Track body; 513. Track block; 514. Adjusting bolt; 515. Support block; 5151. Sliding part; 5152. Circular part; 52. Locking gear; 53. Bracket; 54. Locking bolt; 55. Locking gear plate; 551. Limiting rod; 56. Switching bolt; 57. Synchronous rack; 58. Tensioning component; 581. Bidirectional screw; 582. Tensioning block; 583. Pull rod frame; 584. Driving rod; 585. Bevel gear pair three. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below with reference to the accompanying drawings.

[0026] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be used for other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0027] Those skilled in the art should understand that, in the disclosure of the present invention, the directions or positions indicated by the terms "longitudinal", "lateral", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings, which are only simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the above terms should not be understood as limitations on the present invention.

[0028] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0029] See also Figure 1-Figure 7A heat network pipeline welding auxiliary equipment includes a support member 1, an auxiliary member 2, an adjustment device 3, an abutment member 4 and a tensioning mechanism 5. The support member 1 includes a base 11 and support beams 12 arranged at both ends of a bottom beam 121. The base 11 is fixedly connected to the support beam 12. The two support beams 12 are distributed on both sides of the pipeline welding seam, so that the pipeline joint is exposed to facilitate subsequent welding. The support beam 12 includes a bottom beam 121 and side beams 122 fixed on both sides of the bottom beam 121. The side beams 122 are distributed on both sides of the pipeline.

[0030] The auxiliary part 2 is arranged in a one-to-one correspondence with the side beam 122. The auxiliary part 2 includes a fixed wheel 21 and a movable wheel 22 connected to the side beam 122. The fixed wheel 21 is fixed on the side beam 122, and the fixed wheel 21 is rotatably connected to the side beam 122. The movable wheel 22 is located on the upper side of the fixed wheel 21. The movable wheel 22 is connected to the side beam 122 through a slider 23. A slide groove 1221 for the slider 23 to slide is provided on the side beam 122. Both sides of the slider 23 are in contact with the slide groove 1221, so that the slider 23 can move along the side beam 122.

[0031] The adjusting device 3 is arranged on the support member 1, and the adjusting device 3 includes an adjusting screw 31 rotatably connected to the side beam 122. The upper end of the adjusting screw 31 protrudes from the side beam 122 and is connected to a turning handle rod. The adjusting screw 31 is threadedly connected to the slider 23. The movable wheel 22 is raised and lowered by rotating the adjusting screw 31, and the side beam 122 is tilted. The distance between the two side beams 122 increases upwards. After the movable wheel 22 rises, space is vacated to place the pipeline in the support beam 12. After the pipeline is placed, the adjusting screw 31 is rotated to make the movable wheel 22 descend until it abuts against the pipeline. At this time, the pipeline is limited by the upper and lower fixed wheels 21 and the movable wheel 22 to stabilize the pipeline.

[0032] The abutment 4 is connected to the side beam 122, and the abutment 4 is located on both sides of the pipe, and the abutment 4 abuts against the pipe. A tensioning mechanism 5 is provided between the abutment 4 on the two support beams 12. After the abutment 4 abuts against the pipe, the tensioning mechanism 5 applies opposite forces to the two pipes, so that the two pipes are closely butted, which is conducive to welding. There is no blocking component that blocks or limits the welding point except the base 11 directly below the welding point, so it is conducive to welding, and there is space between the base 11 and the welding point, so that the welder can see the welding point and operate the welding equipment.

[0033] The adjusting device 3 also includes a synchronization component 32, which includes a synchronization rod 321 rotatably connected to the bottom beam 121, and a rod body 322 is rotatably connected to the bottom of the side beam 122. The rod body 322 is at the same height as the synchronization rod 321. One end of the rod body 322 is connected to the adjusting screw 31 through a bevel gear pair 1 323, and the bevel gear pair 1 323 is located in the slide groove 1221. The other end of the rod body 322 is connected to the synchronization rod 321 through a bevel gear pair 2 324. On the same support beam 12, the synchronization component 32 enables the two movable wheels 22 to move synchronously, so that the pipelines are subjected to the same force, which is beneficial to the stability of the pipeline.

[0034] The abutment 4 is provided with an arc portion 41 adapted to pipes of different sizes. This application takes four arc portions 41 as an example. Arc portions 41 of different sizes correspond to pipes of different gears. The arc portions 41 are provided with a rubber pad 42 for increasing friction. When the abutment 4 is tightened, the rubber pad 42 can prevent slipping and is conducive to applying tension to the pipe. After the abutment 4 on both sides abuts against the pipe, it is also conducive to stabilizing the pipe and facilitating the stability of the welding point.

[0035] The tensioning mechanism 5 includes a sliding mechanism 51 for adjusting the position of the abutment 4, and the sliding mechanism includes a fixed shaft 511 fixedly connected to the side beam 122, and the end of the fixed shaft 511 is rotatably connected to the track body 512, and a track block 513 is slidably connected in the track body 512, and the track body 512 is quickly inserted into the track body 512, and the track body 512 limits the track block 513, and the track body 512 allows the track block 513 to move linearly along the track body 512, and an adjusting bolt 514 is threadedly connected on the track body 512, and the adjusting bolt 514 is rotatably connected to the track block 513, and the abutment 4 is rotatably connected to the track block 513, and the track body 512 is rotated, and the abutment 4 is rotated with the track body 512, and then the abutment 4 is moved by the adjusting bolt 514, so that the arc portion 41 on the abutment 4 can fit with the pipe surfaces of different sizes.

[0036] The track body 512 is fixedly connected with a locking gear 52, the side beam 122 is fixedly connected with a bracket 53, the bracket 53 is threadedly connected with a locking bolt 54, the end of the locking bolt 54 is rotatably connected with a locking tooth plate 55, the locking tooth plate 55 is fixed with a limiting rod 551, the limiting rod 551 is slidably connected with the bracket 53, the limiting rod 551 is used to limit the locking tooth plate 55, cooperate with the locking bolt 54 to make the locking tooth plate 55 move linearly, and the rotating track body 512 is fixed by the locking tooth plate 55 and the locking bolt 54. The track body 512 can be rotated so that the track body 512 is located in the radial direction of the pipeline, and the rotation center of the abutment 4 is located on the line connecting the track body 512 and the center of the pipeline, which is conducive to the transmission of force and thus conducive to the stability of the pipeline.

[0037] A support block 515 is provided at the end of the track block 513. The support block 515 includes a sliding portion 5151 and a circular portion 5152. The sliding portion 5151 is slidably connected to the track block 513, and the abutment 4 is rotatably connected to the circular portion 5152. A threaded groove is provided on the circular portion 5152. A sleeve 43 extends from the abutment 4. A fixing hole 44 is provided on the sleeve 43. The fixing hole 44 corresponds to the arc portion 41 one by one. The threaded groove corresponds to the fixing hole 44. A switching bolt 56 is threadedly connected to the threaded groove. When switching the arc portion 41, the abutment 4 is first rotated so that the arc portion 41 matches the size of the pipeline. At this time, the fixing hole 44 corresponds to the threaded groove, and then the switching bolt 56 is inserted into the fixing hole 44 and connected to the threaded groove, thereby fixing the abutment 4 after rotation. A synchronous rack 57 is slidably connected to the support beam 12, and both ends of the synchronous rack 57 are meshed with the locking gear 52 on the corresponding side. On the same support beam 12, one track body 512 is rotated, and the other track body 512 is rotated through the synchronous rack 57, which not only reduces the number of operating steps but also makes the two abutments 4 rotate with the same amplitude, and makes the two abutments 4 symmetrically distributed on both sides of the pipe, which is beneficial to the fitting of the pipe arc portion 41 with the pipe.

[0038] The tensioning mechanism 5 also includes a tensioning component 58, which includes a bidirectional screw 581. Both ends of the bidirectional screw 581 are connected to tensioning blocks 582. The tensioning block 582 is slidably connected to the base 11. A pull rod frame 583 is slidably connected to the tensioning block 582. The upper end of the pull rod frame 583 is fixed to the sliding part 5151. The sliding direction of the pull rod frame 583 is perpendicular to the moving direction of the tensioning block 582. The pull rod frame 583 moves synchronously with the track block 513. A driving rod 584 is rotatably connected to the support beam 12. The driving rod 584 is connected to one end of the bidirectional screw 581 through a bevel gear pair 3 585. By rotating the driving rod 584, the bidirectional screw is rotated through the bevel gear pair 3 585. The bidirectional screw 581 applies a force to the two tensioning blocks 582 to move them closer to each other. The tensioning blocks 582 apply a force to the abutment 4 to move them closer to each other through the pull rod frame 583. The abutment 4 applies a force to the pipeline to move them closer to each other, thereby making the pipeline joint close and stable.

[0039] When in use, place the pipe in the support beam 12 and make the pipes form a butt joint. After the pipes are placed, turn the adjusting screw 31 to make the movable wheel 22 drop. The adjusting screw 31 makes the movable wheel 22 on the other side drop through the synchronous component 32 until the two movable wheels 22 abut against both sides of the pipe. At this time, the pipe is limited by the upper and lower fixed wheels 21 and the movable wheel 22 to keep the pipe stable. At this time, the welding is relatively stable. Then rotate the abutment 4 to make the arc portion 41 match the pipe size. At this time, the fixing hole 44 corresponds to the threaded groove. Then insert the switching bolt 56 into the fixing hole 44 and rotate it to connect with the threaded groove, so as to fix the abutment 4 after rotation. By rotating the locking bolts 54 respectively, the two locking racks are separated from the corresponding locking gears 52. At this time, rotate the track body 512. The synchronous rack 57 makes the other track body 512 on the same support beam 12 rotate, so that the abutting arc portion 41 corresponds to the pipeline, and then the adjusting bolt 514 is rotated to move the track block 513, and the support block 515 moves with the abutment 4 until the rubber pad 42 on the abutment 4 fits with the pipeline. The docking piece has the function of stabilizing the pipeline at this time. At this time, the locking bolt 54 is rotated to make the locking tooth plate 55 and the limit rod 551 move together, and the locking tooth plate 55 is meshed with the locking gear 52, thereby fixing the track body 512, and then the locking bolt 54 on the other side is rotated to fix the locking gear 52 on the other side. The abutment 4 and the sliding mechanism 51 on the other support beam 12 are operated in the same way, so that the longitudinal stability of the two pipelines is increased. Finally, the driving rod 584 is rotated, and the rotating rod causes the bidirectional screw to rotate through the bevel gear pair 3 585. The bidirectional screw 581 applies a force to the two tensioning blocks 582 to move closer to each other. The tensioning blocks 582 apply a force to the support block 515 and the abutment 4 to move closer to each other through the pull rod frame 583. The abutment 4 applies a force to the pipeline to move closer to each other, so that the pipeline joint is tight and stable.

[0040] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A heating network pipeline welding auxiliary equipment, characterized in that: include: A support member (1), comprising a base (11) and support beams (12) arranged at both ends of a bottom beam (121), the two support beams (12) being distributed on both sides of a pipeline welding seam, the support beam (12) comprising a bottom beam (121) and side beams (122) fixed on both sides of the bottom beam (121); An auxiliary component (2) is arranged in a one-to-one correspondence with the side beam (122), the auxiliary component (2) comprising a fixed wheel (21) and a movable wheel (22) connected to the side beam (122), the movable wheel (22) being located on the upper side of the fixed wheel (21), the movable wheel (22) being connected to the side beam (122) via a slider (23), and a slide groove (1221) for the slider (23) to slide is provided on the side beam (122); An adjusting device (3) disposed on the support member (1), the adjusting device (3) comprising an adjusting screw (31) rotatably connected to the side beam (122), the adjusting screw (31) being threadedly connected to the slider (23); An abutment member (4) is connected to the side beam (122), the abutment member (4) abuts against the pipeline, and a tensioning mechanism (5) is provided between the abutment members (4) on the two support beams (12).

2. The heating network pipeline welding auxiliary equipment according to claim 1 is characterized in that: The adjusting device (3) further comprises a synchronization component (32), wherein the synchronization component (32) comprises a synchronization rod (321) rotatably connected to the bottom beam (121), a rod body (322) rotatably connected to the bottom of the side beam (122), one end of the rod body (322) being connected to the adjusting screw rod (31) via a first bevel gear pair (323), and the other end of the rod body (322) being connected to the synchronization rod (321) via a second bevel gear pair (324).

3. The heating network pipeline welding auxiliary equipment according to claim 1 is characterized in that: The abutment member (4) is provided with an arc-shaped portion (41) adapted to pipes of different sizes.

4. The heating network pipeline welding auxiliary equipment according to claim 3 is characterized by: The arc-shaped portion (41) is provided with a rubber pad (42) for increasing friction.

5. The heating network pipeline welding auxiliary equipment according to claim 4 is characterized in that: The tensioning mechanism (5) comprises a sliding mechanism (51) for adjusting the position of the abutment member (4); the sliding mechanism comprises a fixed shaft (511) fixedly connected to the side beam (122); the end of the fixed shaft (511) is rotatably connected to a track body (512); a track block (513) is slidably connected inside the track body (512); an adjusting bolt (514) is threadedly connected to the track body (512); the adjusting bolt (514) is rotatably connected to the track block (513); and the abutment member (4) is rotatably connected to the track block (513).

6. The heating network pipeline welding auxiliary equipment according to claim 5 is characterized in that: A locking gear (52) is fixedly connected to the track body (512), a bracket (53) is fixedly connected to the side beam (122), a locking bolt (54) is threadedly connected to the bracket (53), an end of the locking bolt (54) is rotatably connected to a locking tooth plate (55), a limiting rod (551) is fixed to the locking tooth plate (55), and the limiting rod (551) is slidably connected to the bracket (53).

7. The heating network pipeline welding auxiliary equipment according to claim 5 is characterized in that: A support block (515) is provided at the end of the track block (513), and the support block (515) comprises a sliding portion (5151) and a circular portion (5152), the sliding portion (5151) being slidably connected to the track block (513), the abutment member (4) being rotatably connected to the circular portion (5152), a thread groove being provided on the circular portion (5152), a sleeve (43) extending from the abutment member (4), a fixing hole (44) being provided on the sleeve (43), the fixing hole (44) being in one-to-one correspondence with the arc-shaped portion (41), and a switching bolt (56) being threadedly connected to the thread groove.

8. The heating network pipeline welding auxiliary equipment according to claim 7 is characterized in that: The tensioning mechanism (5) further comprises a tensioning component (58), wherein the tensioning component (58) comprises a bidirectional screw (581), both ends of the bidirectional screw (581) are connected to a tensioning block (582), a pull rod frame (583) is slidably connected to the tensioning block (582), the upper end of the pull rod frame (583) is fixed to the sliding part (5151), and the sliding direction of the pull rod frame (583) is perpendicular to the moving direction of the tensioning block (582).

9. The heating network pipeline welding auxiliary equipment according to claim 8, characterized in that: A driving rod (584) is rotatably connected to the support beam (12), and the driving rod (584) is connected to one end of the bidirectional screw rod (581) via a bevel gear pair (585).

10. The heating network pipeline welding auxiliary equipment according to claim 8, characterized in that: A synchronous rack (57) is slidably connected to the support beam (12), and both ends of the synchronous rack (57) are meshed with the locking gear (52) on the corresponding side.

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