CN216175583U - Bending device is used in production of aluminum alloy connecting piece for aircraft - Google Patents

Abstract

A bending device for producing an aluminum alloy connecting piece for an airplane comprises a fixing plate, a bending structure and a centering structure; the centering structure comprises a first cylinder, a first connecting rod mechanism, a first guide rail, a first centering assembly and a second centering assembly. In the bending process, the cut aluminum alloy circular tube is placed at the position of a bending structure, a first air cylinder in the centering structure drives a first centering assembly and a second centering assembly to move relatively along a first guide rail through a first connecting rod mechanism, so that the aluminum alloy circular tube is automatically centered, and then the bending structure is used for bending in a certain size. The bending machine is simple in structure and convenient to operate, improves the bending size precision and improves the yield.

Description

Bending device is used in production of aluminum alloy connecting piece for aircraft

Technical Field

The utility model relates to the field of production of aluminum alloy connecting pieces, in particular to a bending device for production of aluminum alloy connecting pieces for airplanes.

Background

Because the aluminum alloy has the characteristics of wear resistance, durability, attractive and elegant appearance and the like, the aluminum alloy is often used as a handle on doors such as a power box, an electric cabinet and the like on an airplane.

However, in the process of bending the aluminum alloy connecting piece handle, the aluminum alloy round rod is easy to shift to the king side when being placed, so that the length of the two sides of the bent handle are different, and the normal use is affected.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: the utility model aims to provide a bending device for producing an aluminum alloy connecting piece for an airplane, which solves the problems existing in the production of the aluminum alloy connecting piece for the airplane.

The technical scheme is as follows: the utility model provides a bending device for producing an aluminum alloy connecting piece for an airplane, which comprises a fixing plate, a bending structure and a centering structure, wherein the bending structure is arranged in the middle of the fixing plate, and the centering structure is arranged below the fixing plate and positioned on two sides of the bending structure; the centering structure comprises a first cylinder, a first connecting rod mechanism, a first guide rail, a first centering assembly and a second centering assembly, wherein the plunger end of the first cylinder is connected with the first centering assembly and the second centering assembly which are arranged at two ends of the first guide rail respectively through the first connecting rod mechanism. In the bending process, the cut aluminum alloy circular tube is placed at the position of a bending structure, a first air cylinder in the centering structure drives a first centering assembly and a second centering assembly to move relatively along a first guide rail through a first connecting rod mechanism, so that the aluminum alloy circular tube is automatically centered, and then the bending structure is used for bending in a certain size. The bending machine is simple in structure and convenient to operate, improves the bending size precision and improves the yield.

Furthermore, the first connecting rod mechanism comprises a first connecting seat, a first connecting rod assembly and a second connecting rod assembly, and one end of each of the first connecting rod assembly and the second connecting rod assembly is connected with the first connecting seat; the first connecting rod assembly and the second connecting rod assembly are identical in structure, the first connecting rod assembly comprises a first rod, a first connecting shaft and a second connecting shaft, and the first connecting shaft and the second connecting shaft are respectively arranged at two ends of the first rod. First link assembly, second link assembly one end is connected through first connecting axle and first connecting seat respectively, the other end is respectively through second connecting axle and first centering subassembly, the second connecting seat in the second centering subassembly is connected, when the cylinder moves through first connecting seat drive first link mechanism, first link assembly, second link assembly removes the same distance along first guide rail simultaneously, thereby guarantee first centering subassembly, the second is to centering subassembly and do in opposite directions or reverse movement, thereby play the centering effect to the aluminum alloy pipe, the size precision of the aluminum alloy connecting piece handle that has obtained has been improved.

Furthermore, the first centering assembly and the second centering assembly have the same structure, the first centering assembly comprises a second connecting seat, a second connecting rod structure, a push plate, a first guide structure and a second guide structure, one end of the second connecting seat is connected with the middle of the second connecting rod structure, two ends of the second connecting rod structure are connected with the push plate, and the first guide structure and the second guide structure are arranged in parallel and connected with the push plate. When the cylinder drives the first centering component and the second centering component to move along the first guide rail through the first connecting rod structure, the push plate in the first centering component and the second centering component is pushed by the second connecting rod structure connected with the second connecting seat to move oppositely or reversely along the first guide structure and the second guide structure, so that the aluminum alloy round pipe with the external bending structure plays a centering role, the operation is simple and convenient, and the position precision of the aluminum alloy round pipe in bending is improved.

Furthermore, the second connecting rod structure comprises a second rod, a third connecting rod assembly, a fourth connecting rod assembly, a third connecting shaft and a fourth connecting shaft, and the third connecting rod assembly and the fourth connecting rod assembly are respectively connected with two ends of the second rod through the third connecting shaft and the fourth connecting shaft; the third connecting rod assembly and the fourth connecting rod assembly are identical in structure, the third connecting rod assembly comprises a third rod, a fourth rod, a fifth connecting shaft, a sixth connecting shaft, a seventh connecting shaft and an eighth connecting shaft, the end parts of the fourth rod and the fifth rod are connected with the two ends of the third rod through the fifth connecting shaft, the sixth connecting shaft and the fifth connecting shaft respectively, the seventh connecting shaft is arranged at the other end, far away from the third rod, of the fourth rod, and the eighth connecting shaft is arranged at the other end, far away from the third rod, of the fifth rod. The second connecting seat is connected with the middle position of the second rod, the second rod moves during centering action, and the third connecting rod assembly and the fourth connecting rod assembly at the two ends drive the push plate to move along the first guide structure and the second guide structure.

Furthermore, the first guide structure and the second guide structure have the same structure, the first guide structure comprises a fixed seat, a guide sleeve and a guide rod, the guide sleeve is arranged on the fixed seat, and the guide rod is arranged in the guide sleeve. One end of the guide rod is fixed on the push plate, and when the centering structure is centered, the push plate moves along the guide sleeve through the guide rod, so that the centering position precision is improved.

Furthermore, the bending structure comprises a second cylinder, a moving seat, a positioning block, a second guide rail, a third guide rail, a first bending roller structure, a second bending roller structure, a first fixed bending roller structure and a second fixed bending roller structure, wherein a plunger end of the second cylinder is connected with the moving seat, the positioning block is arranged on the moving seat, the second guide rail and the third guide rail are arranged below the moving seat side by side, the first bending roller structure and the second bending roller structure are respectively arranged on two sides of the positioning block, and the first fixed bending roller structure and the second fixed bending roller structure are arranged on two sides of the second guide rail and the third guide rail. The aluminum alloy pipe is placed on the locating piece, after through centering structure centering action, the second cylinder drive removes the seat along the second guide rail, the third guide rail removes to first fixed bending roller structure, the fixed bending roller structure direction of second, through first bending roller structure, the mutual extrusion of second bending roller structure and first fixed bending roller structure, the fixed bending roller structure of second, bend into required size with the aluminum alloy pipe, its easy operation is convenient.

Furthermore, a first arc-shaped limiting groove is formed in the positioning block. The positioning device is used for positioning the aluminum alloy round pipe.

Furthermore, the first bending roller structure and the second bending roller structure are the same in structure, the first bending roller structure comprises a first rotating shaft, a first bearing seat, a second bearing seat, a first snap spring, a second snap spring and a first shaft sleeve, the first bearing seat and the second bearing seat are arranged on the first rotating shaft in parallel and fixed through the first snap spring and the second snap spring respectively, and the first bearing seat and the second bearing seat are arranged on the first rotating shaft; and a second arc-shaped limiting groove is formed in the first shaft sleeve. The aluminum alloy circular tube is clamped in the second arc-shaped limiting groove on the first shaft sleeve of the first bending roller structure and the second bending roller structure, and when the aluminum alloy circular tube is bent, the first shaft sleeve rotates around the first rotating shaft under the support of the first bearing seat and the second bearing seat, so that the bending work is facilitated.

Furthermore, the first fixed bending roller structure and the second fixed bending roller structure are the same in structure, the first fixed bending roller structure comprises a roller fixing seat and a third bending roller structure, the third bending roller structure is arranged on the roller fixing seat, the third bending roller structure comprises a second rotating shaft, a third bearing seat, a fourth bearing seat, a third snap spring, a fourth snap spring and a second shaft sleeve, the third bearing seat and the fourth bearing seat are arranged on the second rotating shaft in parallel and are fixed through the third snap spring and the fourth snap spring respectively, and the third bearing seat and the fourth bearing seat are arranged on the second rotating shaft; and a third arc-shaped limiting groove is formed in the second shaft sleeve.

The technical scheme shows that the utility model has the following beneficial effects: 1) the centering structure is arranged, and automatic centering adjustment is carried out on the aluminum alloy circular tube before bending, so that the bending position precision is improved, and the yield of the aluminum alloy connecting piece handle for the airplane is improved; 2) through the arrangement of the plurality of groups of connecting rod assemblies, automatic centering of the aluminum alloy circular tube is realized, and the aluminum alloy circular tube centering device is simple to operate, convenient to use and wide in applicability; 3) the bending machine is suitable for bending aluminum alloy connecting piece handles for airplanes with different sizes.

Drawings

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a perspective view of the centering structure;

FIG. 3 is a perspective view of the first linkage;

FIG. 4 is a perspective view of a first centering assembly;

FIG. 5 is a top view of the second link structure;

FIG. 6 is a perspective view of the production of an aluminum alloy connector for aircraft;

FIG. 7 is a front view of a first press bending roller configuration;

fig. 8 is a front view of a first fixed press bending roller structure.

In the figure: fixing plate 1, production 2 of aluminum alloy connecting piece for airplane, second cylinder 21, moving seat 22, positioning block 23, first arc-shaped limiting groove 231, second guide rail 24, third guide rail 25, first bending roller structure 26, first rotating shaft 261, first bearing 262, second bearing 263, first snap spring 264, second snap spring 265, first shaft sleeve 266, second arc-shaped limiting groove 2661, second bending roller structure 27, first fixed bending roller structure 28, roller fixing seat 281, third bending roller structure 282, second rotating shaft 2821, third bearing 2822, fourth bearing 2823, third snap spring 2824, fourth snap spring 2825, second shaft sleeve 2826, third arc-shaped limiting groove 28261, second fixed bending roller structure 29, centering structure 3, first cylinder 31, first connecting rod mechanism 32, first connecting seat 321, first connecting rod assembly 322, first rod 3221, first connecting shaft 3222, The second connecting shaft 3223, the second connecting rod assembly 323, the first guide rail 33, the first centering assembly 34, the second connecting seat 341, the second connecting rod structure 342, the second rod 3421, the third connecting rod assembly 3422, the third rod 34221, the fourth rod 34222, the fifth rod 34223, the fifth connecting shaft 34224, the sixth connecting shaft 34225, the seventh connecting shaft 34226, the eighth connecting shaft 34227, the fourth connecting rod assembly 3423, the third connecting shaft 3424, the fourth connecting shaft 3425, the push plate 343, the first guide structure 344, the fixed seat 3441, the guide sleeve 3442, the guide rod 3443, the second guide structure 345, the second centering assembly 35 and the aluminum alloy circular tube 4.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Example one

As shown in fig. 1, the perspective view of the present invention includes a fixing plate 1, a bending structure 2, and a centering structure 3, wherein the bending structure 2 is disposed at a middle position on the fixing plate 1, and the centering structure 3 is disposed below the fixing plate 1 and located at two sides of the bending structure 2; fig. 2 is a perspective view of the centering structure 3, which includes a first cylinder 31, a first link mechanism 32, a first guide rail 33, a first centering assembly 34, and a second centering assembly 35, wherein a plunger end of the first cylinder 31 is connected to the first centering assembly 34 and the second centering assembly 35 respectively disposed at two ends of the first guide rail 33 through the first link mechanism 32.

Fig. 3 is a perspective view of the first link mechanism 32, which includes a first connecting seat 321, a first link assembly 322, and a second link assembly 323, wherein one end of each of the first link assembly 322 and the second link assembly 323 is connected to the first connecting seat 321; the first link assembly 322 and the second link assembly 323 have the same structure, the first link assembly 322 includes a first rod 3221, a first connecting shaft 3222 and a second connecting shaft 3223, and the first connecting shaft 3222 and the second connecting shaft 3223 are respectively disposed at two ends of the first rod 3221.

The first centering assembly 34 and the second centering assembly 35 have the same structure, and as shown in fig. 4, the first centering assembly 34 is a perspective view of the first centering assembly, and includes a second connecting seat 341, a second connecting rod structure 342, a push plate 343, a first guiding structure 344, and a second guiding structure 345, wherein one end of the second connecting seat 341 is connected to the middle of the second connecting rod structure 342, two ends of the second connecting rod structure 342 are connected to the push plate 343, and the first guiding structure 344 and the second guiding structure 345 are arranged in parallel and connected to the push plate 343.

Fig. 5 is a top view of the second link structure 342, which includes a second rod 3421, a third link assembly 3422, a fourth link assembly 3423, a third connecting shaft 3424, and a fourth connecting shaft 3425, wherein the third link assembly 3422 and the fourth link assembly 3423 are respectively connected to two ends of the second rod 3421 through the third connecting shaft 3424, the fourth connecting shaft 3425, and the third connecting shaft 3424; the third link assembly 3422 and the fourth link assembly 3423 have the same structure, the third link assembly 3422 includes a third rod 34221, a fourth rod 34222, a fifth rod 34223, a fifth connecting shaft 34224, a sixth connecting shaft 34225, a seventh connecting shaft 34226 and an eighth connecting shaft 34227, the ends of the fourth rod 34222 and the fifth rod 34223 are respectively connected with the two ends of the third rod 34221 through the fifth connecting shaft 34224, the sixth connecting shaft 34225 and the seventh connecting shaft 34226 is disposed at the other end of the fourth rod 34222 away from the third rod 34221, and the eighth connecting shaft 34227 is disposed at the other end of the fifth rod 34223 away from the third rod 34221.

The first guiding structure 344 and the second guiding structure 345 have the same structure, the first guiding structure 344 includes a fixed base 3441, a guide sleeve 3442 and a guide rod 3443, the guide sleeve 3442 is disposed on the fixed base 3441, and the guide rod 3443 is disposed in the guide sleeve 3442.

As shown in fig. 6, the bending structure 2 is a perspective view, and includes a second cylinder 21, a moving seat 22, a positioning block 23, a second guide rail 24, a third guide rail 25, a first bending roller structure 26, a second bending roller structure 27, a first fixed bending roller structure 28, and a second fixed bending roller structure 29, where a plunger end of the second cylinder 21 is connected to the moving seat 22, the positioning block 23 is disposed on the moving seat 22, the second guide rail 24 and the third guide rail 25 are disposed below the moving seat 22 in parallel, the first bending roller structure 26 and the second bending roller structure 27 are respectively disposed on two sides of the positioning block 23, and the first fixed bending roller structure 28 and the second fixed bending roller structure 29 are disposed on two sides of the second guide rail 24 and the third guide rail 25.

The positioning block 23 is provided with a first arc-shaped limiting groove 231.

The first bending roller structure 26 and the second bending roller structure 27 have the same structure, and as shown in fig. 7, are a front view of the first bending roller structure 26, and include a first rotating shaft 261, a first bearing seat 262, a second bearing seat 263, a first snap spring 264, a second snap spring 265, and a first bushing 266, where the first bearing seat 262 and the second bearing seat 263 are arranged in parallel on the first rotating shaft 261 and fixed by the first snap spring 264 and the second snap spring 265, respectively, and the first bearing seat 262 and the second bearing seat 263 are arranged on the first rotating shaft 261; the first sleeve 266 is provided with a second arc-shaped limiting groove 2661.

The first fixed press bending roller structure 28 and the second fixed press bending roller structure 29 have the same structure, and as shown in fig. 8, the first fixed press bending roller structure 28 is a front view of the first fixed press bending roller structure 28, and includes a roller fixing seat 281 and a third press bending roller structure 282, the third press bending roller structure 282 is disposed on the roller fixing seat 281, the third press bending roller structure 282 includes a second rotating shaft 2821, a third bearing 2822, a fourth bearing 2823, a third clamp spring 2824, a fourth clamp spring 2825 and a second bushing 2826, the third bearing 2822 and the fourth bearing 2823 are disposed in parallel on the second rotating shaft 2821 and fixed by the third clamp spring 2824 and the fourth clamp spring 2825, respectively, and the third bearing 2822 and the fourth bearing 2823 are disposed on the second rotating shaft 2821; and a third arc-shaped limiting groove 28261 is formed in the second shaft sleeve 2826.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.

Claims (9)

1. The utility model provides a bending device is used in production of aluminum alloy connecting piece for aircraft which characterized in that: the bending device comprises a fixing plate (1), a bending structure (2) and a centering structure (3), wherein the bending structure (2) is arranged in the middle of the fixing plate (1), and the centering structure (3) is arranged below the fixing plate (1) and positioned on two sides of the bending structure (2); the centering structure (3) comprises a first cylinder (31), a first connecting rod mechanism (32), a first guide rail (33), a first centering component (34) and a second centering component (35), and the plunger end of the first cylinder (31) is connected with the first centering component (34) and the second centering component (35) which are arranged at two ends of the first guide rail (33) through the first connecting rod mechanism (32).

2. The bending device for producing the aluminum alloy connecting piece for the aircraft as claimed in claim 1, wherein: the first connecting rod mechanism (32) comprises a first connecting seat (321), a first connecting rod assembly (322) and a second connecting rod assembly (323), and one ends of the first connecting rod assembly (322) and the second connecting rod assembly (323) are respectively connected with the first connecting seat (321); the first connecting rod assembly (322) and the second connecting rod assembly (323) have the same structure, the first connecting rod assembly (322) comprises a first rod (3221), a first connecting shaft (3222) and a second connecting shaft (3223), and the first connecting shaft (3222) and the second connecting shaft (3223) are respectively arranged at two ends of the first rod (3221).

3. The bending device for producing the aluminum alloy connecting piece for the aircraft as claimed in claim 1, wherein: the first centering component (34) and the second centering component (35) are identical in structure, the first centering component (34) comprises a second connecting seat (341), a second connecting rod structure (342), a push plate (343), a first guide structure (344) and a second guide structure (345), one end of the second connecting seat (341) is connected with the middle of the second connecting rod structure (342), two ends of the second connecting rod structure (342) are connected with the push plate (343), and the first guide structure (344) and the second guide structure (345) are arranged in parallel and connected with the push plate (343).

4. The bending device for producing the aluminum alloy connecting piece for the aircraft as claimed in claim 3, wherein: the second connecting rod structure (342) comprises a second rod (3421), a third connecting rod assembly (3422), a fourth connecting rod assembly (3423), a third connecting shaft (3424) and a fourth connecting shaft (3425), and the third connecting rod assembly (3422) and the fourth connecting rod assembly (3423) are respectively connected with two ends of the second rod (3421) through the third connecting shaft (3424), the fourth connecting shaft (3425); the third connecting rod assembly (3422) and the fourth connecting rod assembly (3423) have the same structure, the third connecting rod assembly (3422) comprises a third rod (34221), a fourth rod (34222), a fifth rod (34223), a fifth connecting shaft (34224), a sixth connecting shaft (34225), a seventh connecting shaft (34226) and an eighth connecting shaft (34227), the end parts of the fourth rod (34222) and the fifth rod (34223) are respectively connected with the two ends of the third rod (34221) through the fifth connecting shaft (34224), the sixth connecting shaft (34225) and the seventh connecting shaft (34221), the seventh connecting shaft (34226) is arranged at the other end of the fourth rod (34222) far away from the third rod (34221), and the eighth connecting shaft (34227) is arranged at the other end of the fifth rod (34223) far away from the third rod (34221).

5. The bending device for producing the aluminum alloy connecting piece for the aircraft as claimed in claim 3, wherein: the first guide structure (344) and the second guide structure (345) are identical in structure, the first guide structure (344) comprises a fixed seat (3441), a guide sleeve (3442) and a guide rod (3443), the guide sleeve (3442) is arranged on the fixed seat (3441), and the guide rod (3443) is arranged in the guide sleeve (3442).

6. The bending device for producing the aluminum alloy connecting piece for the aircraft as claimed in claim 1, wherein: the bending structure (2) comprises a second cylinder (21), a moving seat (22), a positioning block (23), a second guide rail (24), a third guide rail (25), a first bending roller structure (26), a second bending roller structure (27), a first fixed bending roller structure (28) and a second fixed bending roller structure (29), the plunger end of the second cylinder (21) is connected with the moving seat (22), the positioning block (23) is arranged on the moving seat (22), the second guide rail (24) and the third guide rail (25) are arranged below the movable seat (22) in parallel, the first bending roller structure (26) and the second bending roller structure (27) are respectively arranged at the two sides of the positioning block (23), the first fixed bending roller structure (28) and the second fixed bending roller structure (29) are arranged on two sides of the second guide rail (24) and the third guide rail (25).

7. The bending device for producing the aluminum alloy connecting piece for the aircraft as claimed in claim 6, wherein: the positioning block (23) is provided with a first arc-shaped limiting groove (231).

8. The bending device for producing the aluminum alloy connecting piece for the aircraft as claimed in claim 6, wherein: the first bending roller structure (26) and the second bending roller structure (27) are identical in structure, the first bending roller structure (26) comprises a first rotating shaft (261), a first bearing seat (262), a second bearing seat (263), a first snap spring (264), a second snap spring (265) and a first shaft sleeve (266), the first bearing seat (262) and the second bearing seat (263) are arranged on the first rotating shaft (261) in parallel and are fixed through the first snap spring (264) and the second snap spring (265) respectively, and the first bearing seat (262) and the second bearing seat (263) are arranged on the first rotating shaft (261); and a second arc-shaped limiting groove (2661) is formed in the first shaft sleeve (266).

9. The bending device for producing the aluminum alloy connecting piece for the aircraft as claimed in claim 6, wherein: the first fixed bending roller structure (28) and the second fixed bending roller structure (29) have the same structure, the first fixed bending roller structure (28) comprises a roller fixing seat (281) and a third bending roller structure (282), the third bending roller structure (282) is arranged on the roller fixing seat (281), the third bending roller structure (282) comprises a second rotating shaft (2821), a third bearing seat (2822), a fourth bearing seat (2823), a third snap spring (2824), a fourth snap spring (2825) and a second shaft sleeve (2826), the third bearing seat (2822) and the fourth bearing seat (2823) are arranged on the second rotating shaft (2821) in parallel and are fixed through the third snap spring (2824) and the fourth snap spring (2825), and the third bearing seat (2822) and the fourth bearing seat (2823) are arranged on the second rotating shaft (2821); and a third arc-shaped limiting groove (28261) is formed in the second shaft sleeve (2826).

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