Pipe piece vertical type hoisting clamp

Abstract

The utility model discloses a pipe piece vertical hoisting clamp, which relates to the field of engineering construction and comprises a hoisting connecting part, a first hoisting arm, a second hoisting arm, a first clamping arm, a second clamping arm and two clamping parts, one end of the first lifting arm and one end of the second lifting arm are hinged to the lifting connecting part through a first shaft pin; the other end of the first suspension arm and the other end of the second suspension arm are hinged to the first clamping arm and the second clamping arm respectively, the intersection position of the first clamping arm and the second clamping arm is hinged through a second shaft pin, and the other end of the first clamping arm and the other end of the second clamping arm are provided with clamping parts respectively and used for jointly clamping a duct piece; a clamping arm locking assembly is arranged between the first shaft pin and the second shaft pin, and an anti-collision assembly is arranged on the outer side of the clamping part. By arranging the anti-collision assembly on the outer side of the clamping part, the anti-collision assembly can guarantee the distance between two pipe pieces in the pipe piece hoisting process, meanwhile, the clamping part is prevented from making direct contact with the front pipe piece, and therefore the possibility that the pipe pieces collide with the clamp is avoided, the structure is simple, and meanwhile practicability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering construction, in particular to a vertical lifting fixture for a pipe segment. Background Art

[0002] At present, the main types of hangers used for vertical lifting of pipe segments are clamping type hangers and bolt-fixed type hangers. Bolt-fixed type hangers are less used due to their low lifting efficiency and easy damage to the bolt holes of the pipe segments. The most commonly used hangers for vertical lifting of pipe segments are clamping type hangers.

[0003] For pipe segment manufacturers, after the pipe segments are formed, they need to be stacked on the outdoor flat ground. In order to facilitate stacking and loading, the stacking method of the pipe segments is as follows: Figure 1 As shown, each segment is arranged in a row, and the segments in each row are arranged side by side along the thickness direction, and the distance between two adjacent segments is small. With such an arrangement structure, when the locking sling is used for stacking, the segment in front has been stacked. Due to manual operation or environmental influences, when the segment behind is lifted, the clamp arm close to the side of the segment in front will inevitably bump against the inner side of the segment in front during stacking. Moreover, since the segment is heavy, the bumping will easily cause damage to the corresponding side of the segment. In severe cases, cracks may appear on the segment, and eventually the segment will break. If the interval between the segments is relatively far, it will occupy a lot of stacking space in the factory, affecting stacking and production efficiency. Utility Model Content

[0004] In view of the problems raised by the background technology, the purpose of the utility model is to provide a vertical lifting fixture for pipe segments, which solves the problem that the existing fixture is easy to collide and damage other pipe segments during operation.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A vertical segment lifting fixture comprises a lifting connection portion, a first lifting arm, a second lifting arm, a first clamping arm, a second clamping arm and two clamping portions;

[0007] One end of the first suspension arm and one end of the second suspension arm are hinged to the suspension connection portion through a first shaft pin;

[0008] The other end of the first suspension arm is hinged to one end of the first clamping arm, the other end of the second suspension arm is hinged to one end of the second clamping arm, the first clamping arm and the second clamping arm are arranged to intersect, and the intersection is hinged by a second shaft pin, the other end of the first clamping arm and the other end of the second clamping arm are respectively provided with the clamping parts, and the two clamping parts are used to clamp the pipe segment together;

[0009] A clamping arm locking assembly is detachably provided between the first axle pin and the second axle pin. The clamping arm locking assembly includes a connecting rod, a hook portion, and a control rod. One end of the connecting rod is rotatably connected to the first axle pin, and the other end of the connecting rod is provided with the hook portion. The hook portion has a U-shaped opening. One end of the control rod is connected to the connecting rod, and the movement of the control rod is used to drive the swinging of the connecting rod. The swinging of the connecting rod can snap the second axle pin into the U-shaped opening for locking;

[0010] At least one set of anti-collision components is provided on the outer side of at least one of the clamping portions.

[0011] Preferably, the anti-collision components include several sets of rollers and a rotating shaft;

[0012] The rotating shaft is arranged on the outer side of the clamping portion, and the axis of the rotating shaft extends along the horizontal direction of the clamping portion. Several sets of the rollers are rotatably arranged on the rotating shaft.

[0013] Preferably, the rollers are made of flexible materials.

[0014] Preferably, a limiting component is further included. The limiting component includes a connecting plate and a limiting plate;

[0015] One end of the connecting plate is connected to the bottom of the second axle pin, and the other end of the connecting plate is connected to the top of the limiting plate;

[0016] The limiting plate is horizontally arranged between the two clamping portions, and a protective layer is provided on the bottom surface of the limiting plate.

[0017] Preferably, the first clamping arm and the second clamping arm are respectively provided with strip-shaped holes which extend in the vertical direction. The second axle pin passes through the two strip-shaped holes and can move up and down in the strip-shaped holes.

[0018] Preferably, the clamping portion includes a clamping plate, a connecting rib plate, and a reinforcing rib plate;

[0019] There are no less than two connecting rib plates which are vertically arranged on the outer side of the clamping plate, and the connecting rib plates are integrally provided with the first clamping arm / the second clamping arm. The reinforcing rib plate is perpendicular to the connecting rib plate;

[0020] The clamping plates of the two clamping portions are arranged relatively parallel, and the inner sides of the two clamping plates are used for jointly clamping the segment.

[0021] Preferably, the clamping plate is of an arc-shaped structure.

[0022] Preferably, anti-slip pads are detachably provided on the opposite sides of the two clamping plates.

[0023] Preferably, the lifting connection portion is a lifting ring or a lifting chain.

[0024] Compared with the prior art, one of the above technical solutions has the following beneficial effects:

[0025] The vertical pipe segment lifting fixture involved in the utility model arranges an anti-collision component on the outer side of at least one clamping part. During the process of lifting the pipe segment, the pipe segment is lifted and transferred to a storage place where the stacked pipe segments are stored, and is placed on one side of the previous pipe segment. During the stacking process, the arrangement of the anti-collision component can ensure the distance between the two pipe segments, while avoiding direct contact between the clamping part and the previous pipe segment, thereby completely avoiding the possibility of collision between the pipe segment and the lifting device. The structure is relatively simple and the practicability is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the pipe segment stacking in the prior art;

[0027] Figure 2 It is a structural schematic diagram of an embodiment of the utility model;

[0028] Figure 3 A schematic structural diagram of another embodiment of the utility model from another angle;

[0029] Figure 4 It is a partial structural schematic diagram of the clamp arm locking assembly of the utility model.

[0030] Among them: pipe segment 01, lifting connection part 1, first lifting arm 21, second lifting arm 22, first clamping arm 31, second clamping arm 32, strip hole 30, clamping part 4, clamping plate 41, connecting rib plate 42, reinforcing rib plate 43, anti-slip pad 44, first axle pin 51, second axle pin 52, clamping arm locking assembly 8, connecting rod 81, hook 82, control rod 83, anti-collision assembly 6, roller 61, rotating shaft 62, connecting plate 71 and limiting plate 72. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0032] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0033] In addition, the terms "first", "second" and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, features defined as "first", "second" and "third" may explicitly or implicitly include one or more of the features.

[0034] It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0035] The following is combined with Figures 1 to 4 The technical solution of the utility model is further illustrated by specific implementation methods.

[0036] A vertical segment hoisting fixture comprises a hoisting connection portion 1, a first hoisting arm 21, a second hoisting arm 22, a first clamping arm 31, a second clamping arm 32 and two clamping portions 4;

[0037] One end of the first suspension arm 21 and one end of the second suspension arm 22 are hinged to the suspension connection portion 1 through a first shaft pin 51;

[0038] The other end of the first suspension arm 21 is hinged to one end of the first clamping arm 31, and the other end of the second suspension arm 22 is hinged to one end of the second clamping arm 32. The first clamping arm 31 and the second clamping arm 32 are arranged to intersect each other, and the intersection is hinged by a second shaft pin 52. The other end of the first clamping arm 31 and the other end of the second clamping arm 32 are respectively provided with the clamping part 4, and the two clamping parts 4 are used to clamp the pipe segment 01 together.

[0039] A clamp arm locking assembly 8 is detachably provided between the first shaft pin 51 and the second shaft pin 52, and the clamp arm locking assembly 8 is used to limit the two clamping parts 4 from being relatively close to each other;

[0040] At least one set of anti-collision components 6 is disposed on the outer side of at least one of the clamping parts 4 .

[0041] As the instruction manual Figure 2 As shown, the utility model provides a vertical lifting clamp for a pipe segment, wherein the lifting connection part 1 is connected to a lifting device, and under the action of the lifting device, the lifting connection part 1, the first lifting arm 21, the second lifting arm 22, the first clamping arm 31, the second clamping arm 32 and the two clamping parts 4 can realize the upward movement. Specifically, one end of the first boom 21 and the second boom 22 are hinged by the first axle pin 51, the other end of the first boom 21 is hinged to the first clamping arm 31, the other end of the second boom 22 is hinged to the second clamping arm 32, and the first clamping arm 31 and the second clamping arm 32 intersect with each other and are connected by the second axle pin 52 at the intersection. When the lifting connection part 1 is lifted by the lifting device, it is equivalent to being lifted from the first axle pin 51, and the ends of the first boom 21 and the second boom 22 away from the first axle pin 51 approach each other in opposite directions under the action of gravity. Since one end of the first clamping arm 31 and the second clamping arm 32 are respectively hinged to the first boom 21 and the second boom 22, it is equivalent to the first clamping arm 31 and the second clamping arm 32 also being relatively close. Further explanation, since the first clamp arm 31 and the second clamp arm 32 are hinged by the second axle pin 52, the clamping force achieved by the two clamping parts 4 arranged at the ends of the first clamp arm 31 and the second clamp arm 32 being relatively close to each other is more stable during the process of clamping the pipe segment. In order to be able to maintain the open state between the two clamping parts 4 when the lifting clamp is not clamping the pipe segment, so that the pipe segment 01 can quickly enter the to-be-clamped position between the two clamping parts 4 during the next clamping, eliminating the process of opening the two clamping parts 4, a clamp arm locking assembly 8 for limiting the relative closeness of the two clamping parts 4 is arranged between the first axle pin 51 and the second axle pin 52.

[0042] In the present invention, at least one of the clamping parts 4 is provided with an anti-collision component 6 on its outer side. Figure 1 In the stacking storage shown, when clamping the pipe segment 01, the anti-collision component 6 is just set between two adjacent pipe segments 01, so that during the stacking process, the setting of the anti-collision component 6 can ensure the distance between the pipe segments 01 and prevent the clamping part 4 from directly contacting the pipe segment 01 next to it. Figure 2 and Figure 3 As shown, two groups of anti-collision components 6 are respectively arranged on the outer sides of the two clamping parts 4, and the two groups of anti-collision components 6 are arranged in an array along the vertical direction of the clamping part 4. The number of groups of anti-collision components 6 can be specifically set according to the size of the clamping part 4 and the actual application.

[0043] The segment vertical lifting fixture involved in the present utility model is provided with an anti-collision component 6 on the outer side of at least one clamping part 4. During the process of lifting the segment 01, the segment 01 is lifted and transferred to the stacked segment storage place and placed on one side of the previous segment; during the stacking process, the setting of the anti-collision component 6 can ensure the distance between two segments, and at the same time avoid the direct contact between the clamping part 4 and the previous segment, thus completely avoiding the possibility of the segment colliding with the lifting tool. The structure is relatively simple and the practicability is relatively strong.

[0044] Furthermore, the anti-collision component 6 includes a plurality of groups of rollers 61 and a rotating shaft 62;

[0045] The rotating shaft 62 is arranged on the outer side of the clamping part 4, the axis of the rotating shaft 62 extends along the horizontal direction of the clamping part 4, and a plurality of groups of the rollers 61 are rotatably arranged on the rotating shaft 62.

[0046] By arranging the rotatable rollers 61, during the process of the fixture clamping and transferring the segment 01, even if the clamping part 4 approaches or touches the previous segment, the direct hard contact can be avoided due to the rolling of the rollers 61, thereby effectively reducing the possible damage or scratches caused by the contact of the segment.

[0047] The number of the rollers 61 can be specifically set according to the actual application.

[0048] Furthermore, the roller 61 is made of a flexible material. In order to ensure the compression deformation force of the anti-collision component 6 and be able to adapt to the corresponding compressive stress, the roller 61 is made of a flexible material. The setting of the roller 61 can well realize the flexible limit of the distance between the segments 01 during the stacking of the segments, and at the same time the deformation of the roller 61 can also avoid the rigid collision between the clamping part 4 and the segment 01, thus completely avoiding the possibility of the segment 01 colliding with the fixture. Preferably, the roller 61 is made of materials such as resin, rubber or felt.

[0049] Furthermore, the clamp arm locking component 8 includes a connecting rod 81, a hook part 82 and a control rod 83. One end of the connecting rod 81 is rotatably connected to the first pin 51, the other end of the connecting rod 81 is provided with the hook part 82, the hook part 82 has a U-shaped opening, and one end of the control rod 83 is connected to the connecting rod 81;

[0050] The movement of the control rod 83 is used to drive the swinging of the connecting rod 81, and the swinging of the connecting rod 81 can lock the second pin 52 into the U-shaped opening.

[0051] After the segment 01 is placed on the vertical segment lifting fixture, in order to prevent the two clamping parts 4 from being relatively close to each other under the action of gravity when the lifting device is lifted, so that the two clamping parts 4 need to be opened when the next segment 01 needs to be clamped, the clamp arm locking assembly 8 is set, and the control rod 83 can be manually operated to drive the connecting rod 81 to rotate around the first axis pin 51 until the opening of the hook part 82 at the end of the connecting rod 81 is locked in the second axis pin 52 to prevent the two clamping parts 4 from being relatively close to each other, thereby realizing the position locking of the fixture. When the locked fixture moves to the corresponding segment, the hook part 82 is manually disengaged from the second axis pin 52 by operating the control rod 83, and the positions of the first axis pin 51 and the second axis pin 52 are no longer locked, so that the two clamping parts 4 can be close to each other under the action of gravity to clamp the segment 01. To further explain, after the hook 82 is disengaged from the second axle pin 52 by pulling the control rod 83, the second axle pin 52 moves downward, and the distance between the second axle pin 52 and the first axle pin 51 becomes larger and greater than the length of the connecting rod 81. Even if the connecting rod 81 swings back to the initial position, the second axle pin 52 cannot be stuck.

[0052] Furthermore, it also includes a limiting assembly, which includes a connecting plate 71 and a limiting plate 72;

[0053] One end of the connecting plate 71 is connected to the bottom of the second shaft pin 52, and the other end of the connecting plate 71 is connected to the top of the limiting plate 72;

[0054] The limiting plate 72 is horizontally disposed between the two clamping parts 4 , and a protective layer is disposed on the bottom surface of the limiting plate 72 .

[0055] An inverted U-shaped clamping space is formed between the limiting plate 72 and the two clamping parts 4. The limiting plate 72 located at the top of the clamping space can prevent the top of the pipe segment 01 from going too deep into the interior of the clamp when the clamp is clamped, and colliding with the first clamping arm 31 or the second clamping arm 32, thereby playing a role of positioning and limiting.

[0056] The bottom surface of the limiting plate 72 is also provided with a protective layer. Preferably, the protective layer is made of a material with good deformation, such as rubber or resin, so as to provide a buffer and protect the limiting plate 72 when it contacts the pipe segment 01 .

[0057] Furthermore, the first clamping arm 31 and the second clamping arm 32 are respectively provided with a strip hole 30 , and the strip hole 30 is extended in the vertical direction. The second shaft pin 52 is passed through the two strip holes 30 and can move up and down in the strip holes 30 .

[0058] The hinges of the first clamp arm 31 and the second clamp arm 32 are respectively provided with strip holes 30 extending in the vertical direction, and the second axle pin 52 is inserted into the strip hole 30 and can move up and down in the strip hole 30. Since the limit assembly is arranged below the second axle pin 52, when the lifting device lowers the unloaded clamp locked by the clamp arm locking assembly 8 to the top of the pipe segment 01 to be clamped, the top of the pipe segment 01 contacts the limit plate 72 and pushes the limit plate 72 upward, then the limit plate 72 drives the connecting plate 71 and the second axle pin 52 to move upward, and the second axle pin 52 moves upward within the range of the strip hole 30, so that the second axle pin 52 is separated from the hook 82, then the clamp arm locking assembly 8 is unlocked, and the two clamping parts 4 can be relatively close to clamp the pipe segment 01 under the action of gravity. When the lifting device lifts the clamp again, the second axle pin 52 returns to the bottom of the strip hole 30 under the action of gravity.

[0059] Furthermore, the clamping portion 4 includes a clamping plate 41, a connecting rib plate 42 and a reinforcing rib plate 43;

[0060] There are at least two connecting ribs 42, which are vertically arranged on the outside of the clamping plate 41, and the connecting ribs 42 are integrally arranged with the first clamping arm 31 / the second clamping arm 32, and the reinforcing ribs 43 are perpendicular to the connecting ribs 42;

[0061] The clamping plates 41 of the two clamping parts 4 are arranged relatively parallel to each other, and the inner sides of the two clamping plates 41 are used to clamp the pipe segment 01 together.

[0062] The clamping part 4 includes a clamping plate 41, a connecting rib plate 42 extending in the up-down direction for supporting and fixing the clamping plate 41, and a reinforcing rib plate 43 and the connecting rib plate 42 are arranged perpendicularly to each other on the opposite outer sides of the clamping plate 41. To further explain, the number of the connecting rib plates 42 is not less than two, and they are respectively integrated with the first clamping arm 31 or the second clamping arm 32, and the specific number thereof is determined according to the specific size of the clamping arm and the clamping plate 41. The connecting rib plate 42 and the reinforcing rib plate 43 are arranged on the outer side of the clamping plate 41 in cooperation with each other, thereby improving the strength of the clamping part 4.

[0063] Furthermore, the clamping plate 41 is an arc-shaped structure. Since the tube segment 01 is an arc-shaped structure, in order to ensure that the contact area between the clamping plate 41 and the tube segment 01 is increased, thereby increasing the clamping force, the clamping plate 41 is an arc-shaped structure and its curvature is adapted to the curvature of the tube segment 01.

[0064] Furthermore, the opposite sides of the two clamping plates 41 are detachably provided with anti-skid pads 44. The opposite sides of the clamping plates 41 are used to clamp the pipe segment by approaching each other. The anti-skid pads 44 can increase the friction force to prevent slipping and can also achieve flexible contact with the pipe segment to avoid damage to the pipe segment when in contact with the pipe segment.

[0065] It is further explained that the anti-skid pad 44 is detachably connected to the clamp 41. Since the pipe segment is large in size and mass, the frequent friction between the anti-skid pad 44 and the pipe segment during the process of lifting and transferring the pipe segment by the clamp will cause the anti-skid pad 44 to wear, thereby reducing the friction coefficient of the anti-skid pad 44 and increasing the probability of lifting failure. By providing a detachable and replaceable anti-skid pad 44, once the friction surface of the anti-skid pad 44 is seriously damaged, it can be replaced to ensure the safety of lifting. Preferably, the friction surface of the anti-skid pad 44 in contact with the pipe segment can be provided with a raised pattern to increase the friction coefficient and further improve the safety of lifting.

[0066] Furthermore, the lifting connection part 1 is a lifting ring or a lifting chain. Figure 2 As shown in one embodiment of the present application, the lifting connection part 1 is a lifting ring; Figure 3 Another embodiment of the present application is shown, in which the lifting connection part 1 is a lifting chain.

[0067] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the present invention.

Claims

1. A vertical segment lifting fixture, characterized in that: It includes a hoisting connection part (1), a first boom (21), a second boom (22), a first clamping arm (31), a second clamping arm (32), a limiting component, and two clamping parts (4); One end of the first boom (21) and one end of the second boom (22) are hinged to the hoisting connection part (1) through a first pin (51); The other end of the first boom (21) is hinged to one end of the first clamping arm (31), the other end of the second boom (22) is hinged to one end of the second clamping arm (32), the first clamping arm (31) and the second clamping arm (32) are arranged intersectingly, and the intersection is hinged through a second pin (52). The other ends of the first clamping arm (31) and the second clamping arm (32) are respectively provided with the clamping parts (4), and the two clamping parts (4) are used to jointly clamp the segment (01); A clamping arm locking component (8) is detachably arranged between the first pin (51) and the second pin (52). The clamping arm locking component (8) is used to limit the relative approach of the two clamping parts (4). The clamping arm locking component (8) includes a connecting rod (81), a hook part (82), and a control rod (83). One end of the connecting rod (81) is rotatably connected to the first pin (51), the other end of the connecting rod (81) is provided with the hook part (82), the hook part (82) has a U-shaped opening, and one end of the control rod (83) is connected to the connecting rod (81). The movement of the control rod (83) is used to drive the swing of the connecting rod (81), and the swing of the connecting rod (81) can snap the second pin (52) into the U-shaped opening for locking; At least one group of anti-collision components (6) is arranged on the outer side of at least one of the clamping parts (4). The anti-collision components (6) include several groups of rollers (61) and a rotating shaft (62). The rotating shaft (62) is arranged on the outer side of the clamping part (4), the axis of the rotating shaft (62) extends along the horizontal direction of the clamping part (4), and several groups of the rollers (61) are rotatably arranged on the rotating shaft (62). The rollers (61) are made of flexible materials; The limiting component includes a connecting plate (71) and a limiting plate (72). One end of the connecting plate (71) is connected to the bottom of the second pin (52), the other end of the connecting plate (71) is connected to the top of the limiting plate (72). The limiting plate (72) is horizontally arranged between the two clamping parts (4), and a protective layer is arranged on the bottom surface of the limiting plate (72); The first clamping arm (31) and the second clamping arm (32) are respectively provided with strip-shaped holes (30). The strip-shaped holes (30) extend in the vertical direction. The second pin (52) passes through the two strip-shaped holes (30) and can move up and down in the strip-shaped holes (30).

2. A vertical segment lifting fixture according to claim 1, characterized in that: The clamping part (4) includes a clamping plate (41), a connecting rib plate (42), and a reinforcing rib plate (43); The number of the connecting ribs (42) is no less than two, the connecting ribs (42) are vertically arranged on the outside of the clamping plate (41), and the connecting ribs (42) are integrally arranged with the first clamping arm (31) / the second clamping arm (32), and the reinforcing ribs (43) and the connecting ribs (42) are perpendicular to each other; The clamping plates (41) of the two clamping parts (4) are arranged relatively parallel to each other, and the inner sides of the two clamping plates (41) are used to clamp the pipe segment (01) together.

3. The vertical segment lifting fixture according to claim 2 is characterized in that: The clamping plate (41) is an arc-shaped structure.

4. The vertical segment lifting fixture according to claim 3 is characterized in that: An anti-slip pad (44) is detachably provided on one opposite side of the two clamping plates (41).

5. The vertical segment lifting fixture according to claim 4 is characterized in that: The lifting connection part (1) is a lifting ring or a lifting chain.

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