A welding structure of a cylinder barrel

Abstract

The present invention discloses a welding structure of a cylinder barrel, which is characterized in that it includes a cylinder barrel and an end cover. The end cover includes a body part and a groove part. The body part includes a laterally disposed outer wall, a top portion close to the cylinder barrel, and a bottom portion opposite to the top portion. A part of the outer wall is recessed into the body part to form a welding point part, and the welding point part is disposed circumferentially. The cylinder barrel and the end cover are welded at the welding point part to form a seal; the groove part extends from the top portion to the bottom portion to form an annular groove. The groove part includes a first bottom wall facing the welding point part and a second bottom wall facing away from the welding point part, and the first bottom wall is not communicated with the welding point part. The first bottom wall has a part of a concave arc wall and a convex arc wall, and the convex arc wall is smoothly connected to the concave arc wall. The convex arc wall can disperse stress to avoid causing weld cracks and extend the service life of the seal.

Description

Technical Field

[0001] The invention relates to a welding structure of a cylinder barrel. Background Art

[0002] The cylinder barrel is the main body of the hydraulic cylinder. Its inner hole is generally manufactured by precision machining processes such as boring, reaming, rolling or honing, so that the piston and its seals and supports can slide smoothly, thereby ensuring the sealing effect and reducing wear. When working, the cylinder barrel has to withstand a large amount of hydraulic pressure, so the cylinder barrel should have sufficient strength and rigidity to ensure its quality. The key factor in the service life of the product lies in the service life of the cylinder barrel.

[0003] Generally, the end cover is welded to the end of the cylinder barrel to form a closed oil chamber with the cylinder barrel. Therefore, the end cover and its connectors should have sufficient strength. More importantly, the two are connected by welds and need to bear high pressure together. Since the annular welding structure will inevitably produce welds, the welds are the most vulnerable parts of the entire welding structure, such as various pores, slag inclusions and non-fusion. As shown in the figure. The weld will be subjected to liquid pressure, and stress concentration is more likely to occur at the weld, resulting in weld cracks in the weld. Due to the existence of weld cracks, the service life of the cylinder barrel will be greatly reduced. Therefore, how to reduce the impact of weld stress concentration is a key factor in improving the overall service life of the cylinder barrel. Summary of the invention

[0004] In order to overcome the defects in the prior art, an embodiment of the present invention provides a welding structure of a cylinder barrel, which can avoid weld cracks. The welding structure of the cylinder barrel includes a cylinder barrel and an end cover, the end cover includes a main body and a groove portion, the main body includes an outer wall arranged circumferentially, a top close to the cylinder barrel, and a bottom opposite to the top, the outer wall portion is recessed into the main body to form a welding point portion, the welding point portion is arranged circumferentially, and the cylinder barrel and the end cover are welded at the welding point portion to form a seal; the groove portion extends from the top to the bottom to form an annular groove, the groove portion includes a first bottom wall facing the welding point portion, and a second bottom wall away from the welding point portion, and the first bottom wall is not connected to the welding point portion.

[0005] Further, the first bottom wall is connected to the top and to the outer side wall of the welding point portion.

[0006] Furthermore, the first bottom wall is smoothly connected to the second bottom wall, and the first bottom wall has a portion of a concave arc wall.

[0007] Furthermore, the concave arc wall has a smooth transition.

[0008] Further, the connection between the first bottom wall and the second bottom wall is a connecting portion, and the connecting portion is between the solder joint portion and the bottom in the axial direction.

[0009] Further, the first bottom wall further has a convex arc wall, and the convex arc wall is connected to the top.

[0010] Further, the convex arc wall is smoothly connected to the concave arc wall.

[0011] Further, the convex arc wall surrounds the solder joint portion, and the convex arc wall and the body portion form a surrounding portion with respect to the solder joint portion.

[0012] Further, the connecting portion is arranged towards the solder joint portion.

[0013] Further, the slope of the second bottom wall is less than the slope of the first bottom wall.

[0014] The beneficial effects of the present invention are as follows:

[0015] 1. By providing a groove portion on the end cover, the stress on the weld can be dispersed, thereby preventing the generation of weld cracks;

[0016] 2. The groove portion has a convex arc wall, and the convex arc wall surrounds the solder joint portion, which can make the weld bead remain in the surrounding portion, thereby avoiding the weld bead damaging the seal.

[0017] To make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following specific preferred embodiments are given in conjunction with the accompanying drawings and described in detail as follows. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 is a cross-sectional view of the seal structure in the embodiment of the present invention;

[0020] Figure 2 is in the embodiment of the present invention Figure 1 in the partial enlarged view;

[0021] Figure 3 is a cross-sectional view of the seal in the prior art.

[0022] The figure markings of the above drawings are: seal-100; cylinder-1; end cover-2; main body-20; outer wall-201; top-202; bottom-203; welding point part-204; groove part-21; groove-211; first bottom wall-212; second bottom wall-213; connecting part-214; concave arc wall-2121; convex arc wall-2122; surrounding part-2123; weld-22. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that the terms "upper", "lower", "bottom", "inside", "outside", etc. indicate positions or positional relationships based on the positions 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features.

[0025] To achieve the above object, the present invention provides a cylinder barrel welding structure, comprising a cylinder barrel 1 and an end cover 2. Figure 1 and Figure 2 As shown, the end cover 2 includes a body 20 and a groove portion 2121. The body 20 includes an outer wall 201 arranged in a circumferential direction, a top 202 close to the cylinder 1, and a bottom 203 opposite to the top 202. The outer wall 201 is partially recessed into the body 20 to form a welding point portion 204. The welding point portion 204 is arranged in a circumferential direction. The cylinder 1 and the end cover 2 are welded together to form a sealing member 100 by welding at the welding point portion 204. The groove portion 2121 extends from the top 202 to the bottom 203 to form an annular groove 211. The groove portion 2121 includes a first bottom wall 212 facing the welding point portion 204 and a second bottom wall 213 away from the welding point portion 204. The first bottom wall 212 is not connected to the welding point portion 204.

[0026] In the prior art, Figure 3As shown. The end cover 2 only has the solder joint part 204. The end cover 2 and the cylinder barrel 1 are welded at the solder joint part 204. There will be a weld seam 22 at the solder joint part 204. During operation, stress concentrates at this weld seam 22. When the stress is too large, it will cause a crack 22 in the weld seam 22. Due to the existence of the weld seam 22 crack, the seal 100 is more likely to be damaged, thus greatly reducing the service life of the seal 100.

[0027] In this embodiment, a bevel part 2121 is provided on the end cover 2. The bevel part 2121 extends from the top 202 to the bottom 203 to form an annular groove 211. The bevel part 2121 can disperse the stress at the weld seam 22, thus avoiding the generation of cracks at the weld seam 22.

[0028] Furthermore, the connection part between the first bottom wall 212 and the second bottom wall 213 is the connection part 214. The connection part 214 is between the solder joint part 204 and the bottom 203 in the axial direction. That is, the connection part 214 exceeds the position where the solder joint part 204 is located in the axial direction, and the slope of the second bottom wall 213 is smaller than the slope of the first bottom wall 212.

[0029] Furthermore, the connection part 214 is arranged towards the solder joint part 204. In this way, the first bottom wall 212 can surround the periphery of the solder joint part 204. This can increase the thickness of the body part 20 between the solder joint part 204 and the first bottom wall 212, thus preventing the first bottom wall 212 from being welded through during welding. The first bottom wall 212 is connected to the top 202 and is also connected to the outer side wall 201 of the solder joint part 204.

[0030] In a preferred embodiment, the first bottom wall 212 has a part of a concave arc wall 2121 and a part of a convex arc wall 2122. The concave arc wall 2121 and the convex arc wall 2122 are smoothly connected, and both the concave arc wall 2121 and the convex arc wall 2122 are in smooth transition. The hydraulic pressure is specifically concentrated on the concave arc wall 2121, greatly dispersing the stress at the weld seam 22, and further being able to avoid the generation of weld seam 22 cracks and improving the service life.

[0031] The convex arc wall 2122 is connected to the top 202 of the end cover 2, and the convex arc wall 2122 surrounds the solder joint part 204. The convex arc wall 2122 and the body part 20 form a surrounding part 2123 with respect to the solder joint part 204. During the welding process, it is inevitable to generate welding beads. The convex arc wall 2122 can guide the welding beads to remain in the surrounding part 2123, avoiding the welding beads from damaging the seal 100.

[0032] In other embodiments, the bottom wall of the bevel part 2121 can also be in the form of a superior arc, or other forms that can form the annular groove 211.

[0033] In the present invention, specific embodiments are used to elaborate on the principles and implementation manners of the present invention. The descriptions of the above embodiments are only used to help understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A welding structure of a cylinder barrel, characterized in that, It includes a cylinder barrel and an end cap. The end cap includes a body part and a bevel part. The body part includes a laterally disposed outer wall, a top portion close to the cylinder barrel, and a bottom portion opposite to the top portion. A part of the outer wall is recessed into the body part to form a solder joint part. The solder joint part is circumferentially disposed. The cylinder barrel and the end cap are welded at the solder joint part to form a seal; the bevel part extends from the top portion to the bottom portion to form an annular groove. The bevel part includes a first bottom wall facing the solder joint part and a second bottom wall facing away from the solder joint part. The first bottom wall is not connected to the solder joint part; The first bottom wall is connected to the top portion and is also connected to the outer wall of the solder joint part; the first bottom wall is smoothly connected to the second bottom wall. The first bottom wall has a part of a concave arc wall; the concave arc wall has a smooth transition; The connection part between the first bottom wall and the second bottom wall is a connecting portion. The connecting portion is axially between the solder joint part and the bottom portion; the first bottom wall also has a convex arc wall, and the convex arc wall is connected to the top portion; the convex arc wall is smoothly connected to the concave arc wall; the convex arc wall surrounds the solder joint part. The convex arc wall and the body part form a surrounding portion relative to the solder joint part, so that the convex arc wall can guide the weld beads generated during welding to remain in the surrounding portion to avoid the weld beads damaging the seal; The slope of the second bottom wall is less than the slope of the first bottom wall.

2. The welding structure of the cylinder barrel according to claim 1, characterized in that, The connecting portion faces the solder joint part.

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