Welding structure of plate plug and piston rod, suspension oil cylinder and engineering vehicle

Abstract

The utility model discloses a welding structure of a plate plug and a piston rod, a suspension oil cylinder and an engineering vehicle, and the welding structure comprises the plate plug and a piston rod body, the edge structure of the end face, facing the piston rod body, of the plate plug is a step structure, and the piston rod body is inserted into the step surface. The opposite axial faces of the butt joint position of the plate plug and the piston rod body are welded together through U-shaped welding, a U-shaped welding seam welded through the U-shaped welding is located at the front end of a sealing assembly between the opposite circumferential faces of the plate plug and the piston, and the U-shaped welding seam and the sealing assembly form a double oil leakage prevention structure. And the oil leakage risk of the plate plug under the working condition of large working pressure is effectively reduced.

Description

Technical Field

[0001] The utility model relates to a welding structure of a plate plug and a piston rod, belonging to the technical field of suspension cylinders. Background Art

[0002] With the continuous development of the hydraulic industry, the application range of hydraulic cylinders is becoming more and more extensive, and the design requirements are also becoming more and more diverse. The plate plug of the suspension cylinder is an important component for supporting the central oil pipe and sealing the oil in the inner cavity of the piston rod. It is usually welded and fixed at the end of the piston rod, and seals the working medium in the inner cavity of the piston rod by welding to block the gap. However, in the existing suspension cylinder structure, the connecting part between the plate plug 20 and the piston rod body 10 adopts a fillet welding form. As Figure 1 shown, when the working pressure is relatively high, the welding form of the conventional plate plug structure has a relatively high risk of oil leakage. And when the inner diameter of the rod is relatively small, the welding space is small and it is not easy to carry out welding. Therefore, the existing conventional plate plug structure and welding form cannot meet the use requirements under the high-pressure working conditions of hydraulic cylinders, restricting the use of hydraulic cylinders under large-tonnage and high-pressure working conditions. Content of the Utility Model

[0003] According to the deficiencies of the prior art, the utility model provides a welding structure of a plate plug and a piston rod. By optimizing the plate plug structure and welding form, the weld seam is placed in front of the O-ring to avoid the risk of oil leakage from the weld seam.

[0004] The utility model is realized according to the following technical solutions:

[0005] In a first aspect, the utility model provides a welding structure of a plate plug and a piston rod, including a plate plug and a piston rod body: the end face edge structure of the plate plug facing the piston rod body is set as a stepped structure, the piston rod body is inserted at the stepped surface, and the two are welded together by U-shaped welding between the opposite axial surfaces at the butt joint of the plate plug and the piston rod body. And the U-shaped weld seam formed by U-shaped welding is located in front of the sealing component between the circumferential surfaces of the plate plug and the piston facing each other, and the U-shaped weld seam and the sealing component form a double anti-oil-leakage structure.

[0006] In some embodiments, the sealing component includes an O-ring; a groove is formed in a circle on the inner circumferential surface of the piston, and the O-ring is installed in the groove.

[0007] In some embodiments, the sealing component further includes a retaining ring, and the retaining ring is installed in the groove to improve the sealing pressure-bearing capacity and prevent the O-ring from being extruded out of the groove.

[0008] In a second aspect, the utility model provides a suspension cylinder, including the above-mentioned welding structure of a plate plug and a piston rod.

[0009] In a third aspect, the utility model provides an engineering vehicle, equipped with the above-mentioned suspension cylinder.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0011] 1) The thickness of the U-shaped weld is increased and the strength is enhanced, effectively reducing the risk of oil leakage of the plate plug under the condition of large working pressure;

[0012] 2) The U-shaped weld is placed at the front end of the O-ring, forming a double anti-oil-leakage structure;

[0013] 3) The U-shaped weld is placed at the upper end of the piston rod body, with a large welding space and easy to weld. Description of the Drawings

[0014] The drawings, as a part of the present utility model, are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model, but do not constitute an improper limitation to the present utility model. Obviously, the drawings in the following description are only some embodiments, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0015] In the drawings:

[0016] Figure 1 is the welding structure of the plate plug and the piston rod of the prior art;

[0017] Description of the drawings: 10 - piston rod body, 20 - plate plug.

[0018] Figure 2 is the welding structure of the plate plug and the piston rod of the present utility model;

[0019] Description of the drawings: 1 - piston rod body, 2 - piston, 3 - retaining ring, 4 - O-ring, 5 - plate plug.

[0020] It should be noted that these drawings and text descriptions are not intended to limit the scope of the concept of the present utility model in any way, but to illustrate the concept of the present utility model to those skilled in the art by referring to specific embodiments. Detailed Embodiments

[0021] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0022] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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 should not be construed as a limitation to the present utility model.

[0023] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" 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 directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0024] As Figure 1 shown, the plate plug of the suspension oil cylinder is an important component for supporting the central oil pipe and sealing the oil in the piston rod cavity. It is usually welded and fixed at the end of the piston rod, and seals the working medium in the piston rod cavity by welding to block the gap. In the existing hydraulic cylinder structure, the outer circle of the plate plug is fillet welded to the inner cavity of the piston rod. When the working medium pressure is relatively high, there is a risk of oil leakage at the welded joint between the piston rod and the plug. Moreover, when the inner diameter of the rod is relatively small, the welding space is small and it is not easy to weld. To solve the deficiencies of the existing plate plug structure, the present utility model provides a new welding structure between the plate plug and the piston rod, and the detailed structural solution is as follows Figure 2 shown.

[0025] As Figure 2 shown, a welding structure between a plate plug and a piston rod includes a plate plug 5 and a piston rod body 1. The edge structure of the end face of the plate plug 5 facing the piston rod body 1 is set as a stepped structure. The piston rod body 1 is inserted at the stepped surface, and they are welded together by U-shaped welding between the opposing axial surfaces at the docking joint of the plate plug 5 and the piston rod body 1. Moreover, the U-shaped weld formed by U-shaped welding is located at the front end of the sealing assembly between the opposing circumferential surfaces of the plate plug 5 and the piston 2. The U-shaped weld and the sealing assembly form a double anti-oil leakage structure.

[0026] The above sealing assembly is further described below.

[0027] Continue to refer to Figure 2 shown. The sealing assembly includes an O-ring 4; a groove is formed on the inner circumferential surface of the piston 2, and the O-ring 4 is installed in the groove.

[0028] For a further solution, continue to refer to Figure 2As shown, the sealing assembly further includes a retaining ring 3, which is installed in the groove to improve the sealing pressure-bearing capacity and prevent the O-ring 4 from being extruded out of the groove.

[0029] In summary, the thickness of the U-shaped weld increases and the strength improves, effectively reducing the risk of oil leakage of the plate plug under high working pressure conditions; the U-shaped weld is placed in front of the O-ring, forming a double anti-oil leakage structure; the U-shaped weld is placed at the upper end of the piston rod body, with a large welding space and easy to weld.

[0030] The suspension cylinder provided by the present invention will be described below. The suspension cylinder described below can be mutually corresponding and referred to the welding structure of the plate plug and the piston rod described above.

[0031] A suspension cylinder provided by the present invention may include the welding structure of the plate plug and the piston rod as described in any one of the above embodiments.

[0032] The beneficial effects achieved by the suspension cylinder provided by the present invention are consistent with the beneficial effects achieved by the welding structure of the plate plug and the piston rod provided by the present invention, so they will not be elaborated here.

[0033] The engineering vehicle provided by the present invention will be described below. The engineering vehicle described below can be mutually corresponding and referred to the suspension cylinder described above.

[0034] An engineering vehicle provided by the present invention may include the suspension cylinder as described in any one of the above embodiments.

[0035] The beneficial effects achieved by the engineering vehicle provided by the present invention are consistent with the beneficial effects achieved by the suspension cylinder provided by the present invention, so they will not be elaborated here.

[0036] In the specification provided here, a large number of specific details are described. However, it can be understood that the embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures, and technologies are not shown in detail so as not to obscure the understanding of this specification.

[0037] In addition, those skilled in the art can understand that although some of the embodiments described herein include certain features contained in other embodiments rather than other features, the combination of the features of different embodiments also means that it is within the protection scope of the present invention and forms different embodiments. For example, in the above embodiments, those skilled in the art can use them in combination according to the known technical solutions and the technical problems to be solved by this application.

[0038] The above are only the preferred embodiments of the present invention, and there is no limitation to the present invention in any form. Although the present invention has been disclosed as above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art of this patent, without departing from the scope of the technical solution of the present invention, may make some changes or modifications using the technical content prompted above to obtain equivalent embodiments with equivalent changes. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A welding structure of a plate plug and a piston rod, comprising a plate plug and a piston rod body, characterized in that: The plate plug has a step structure at the end edge structure facing the piston rod body, the piston rod body is inserted at the step surface, and the plate plug and the piston rod body are welded together between the opposing axial surfaces at the joint by U-shaped welding, and the U-shaped weld welded by the U-shaped welding is located at the front end of the sealing assembly between the plate plug and the opposing circumferential surfaces of the piston, and the U-shaped weld and the sealing assembly form a double anti-oil leakage structure.

2. A welding structure of a plate plug and a piston rod according to claim 1, characterized in that: The sealing assembly includes an O-ring; a circle of grooves is formed on the inner peripheral surface of the piston, and the O-ring is installed in the groove.

3. A welding structure of a plate plug and a piston rod according to claim 2, characterized in that: The sealing assembly also includes a retaining ring, which is installed in the groove and is used to improve the pressure-bearing capacity of the seal and prevent the O-ring from squeezing out of the groove.

4. A suspension cylinder, characterized in that: A welding structure comprising a plate plug and a piston rod as described in any one of claims 1 to 3.

5. An engineering vehicle, characterized in that: The suspension cylinder according to claim 4 is installed.

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